Explanation:
First off, it's important to know that the three subatomic particles we have are the proton, neutron and electron.
have a relative charge of +1 : This is the proton. It is the postive subatomic particle present in an atom.
have a relative charge of -1 : This is the electron. It is the negative subatomic particle present in an atom.
have no charge : This is the neutron. It is the neutral subatomic particle present in an atom.
located in the nucleus of an atom : Twoo subatomic particles are located in the nucleus, the neutron and proton.
have a much lower mass than the other two types of particles: This is the electron. The proton and neutron are almost similar in mass. The electron is abut 1 / 1840 times the mass of the proton.
Element M reacts with oxygen to form an oxide with the formula MO. When MO is dissolved in water, the resulting solution is basic. Element M could be ________.Element M reacts with oxygen to form an oxide with the formula MO. When MO is dissolved in water, the resulting solution is basic. Element M could be ________.arsenicgermaniumchlorinecalciumselenium
Answer:
Calcium
Explanation:
Since the element reacts with oxygen to form an oxide with the formula MO, the charge on the element is +2.
Also, since the oxide MO when dissolved in water is basic, the metal is an alkali earth metal.
From the above conditions;
The metal is not arsenic because arsenic is a metalloid has the following oxides As₂O₃ and As₃O₅ and are respectively amphoteric and acidic in nature
The metal is not germanium because is a metalloid and even though germanium oxide has the formula GeO₂, it is amphoteric.
The metal is not chlorine because chlorine is a non-metal
The metal is definitely calcium because calcium oxide has the formula CaO and calcium is an alkaline earth metal.
The metal is not selenium because selenium is anon-meal and its oxide has the formula Se0₂ and is acidic
Select the correct answer. What is the number of protons in this carbon atom? A. 12 B. 6 C. 18 D. 24
Answer:
The correct answer is
C. 6 Protons
Explanation:
Carbon is a nonmetallic element that is available in both organic and inorganic compounds.
Carbon belongs to group 14 elements in the periodic table,carbon is a chemical element with the symbol C and atomic number 6, it can form long chains with its own atoms, a feature called catenation.
Two allotropes of carbon available are diamonds and graphites, which have different crystalline structures
The physical properties of carbon vary widely with the allotropic form.
examples are.
Graphite, diamonds and coal are all nearly pure forms of carbonDiamond is highly transparent. Graphite is opaque and blackDiamond is one of the hardest substances known to man. Graphite is soft and often used as the "lead" in lead pencilsDiamond has a very low electrical conductivity. Graphite is a very good conductorVery brittle, and cannot be rolled into wires or pounded into sheetsWhat is the reactant(s) in the chemical equation below?
300(g) + Fe2O3(s) → 2Fe(s) + 3C02(9)
O A. 2Fe(s)
B. Fe2O3(s)
C. 2Fe(s) + 3C02(9)
D. 300(g) + Fe2O3(s)
SUBMIT
Answer:
I think it's D. 300(g) + Fe2O3(s)
Methanol is classified as what alcohol
Answer:
Hey mate,
Here is your answer. Hope it helps you
Explanation:
Primary alcohols are those alcohols where the carbon atom of the hydroxyl group(OH) is attached to only one single alkyl group. Some of the examples of these primary alcohols include Methanol (, propanol, ethanol, etc. The complexity of this alkyl chain is unrelated to the classification of any alcohol considered as primary. The existence of only one linkage among –OH group and an alkyl group and the thing that qualifies any alcohol as a primary.
PCl5 dissociates according to the reaction: PCl5(g) = PCl3(g) + Cl2(g) One mole of PCl5 was placed in one liter of solution. When equilibrium was established, 0.2 mole of PCl5 remained in the mixture. What is the equilibrium constant for this reaction? (Hint: remember the ICE procedure? initial, change, and equilibrium)
Answer:
[tex]K=3.2[/tex]
Explanation:
Hello,
In this case, for the given equilibrium, we write the law of mass action:
[tex]K=\frac{[PCl_3][Cl_2]}{[PCl_5]}[/tex]
Next, in terms of the change [tex]x[/tex] due to the reaction extent (ICE procedure):
[tex]K=\frac{x*x}{1M-x}[/tex]
Clearly, the initial concentration phosphorous pentachloride is 1 M (one mole per litre), therefore, since the equilibrium concentration is 0.2 M (same volume) we can compute [tex]x[/tex]:
[tex]x=1M-0.2M=0.8M[/tex]
Thus, we compute the equilibrium constant:
[tex]K=\frac{0.8*0.8}{0.2} \\\\K=3.2[/tex]
Regards.
what's the answer to this question
Answer:
D
Explanation:
From given choices it is D.
How many grams of Li are there in 1.39 moles of Li?
Answer:
6.941 grams
Explanation:
The molecular formula for Lithium is Li. The Si base unit for amount of substance is mole. 1 mole is equal to 1 moles Lithium, or 6.941 grams
Answer:
9.647989999999998
Explanation:
A 12.00g sample of MgCl2 was dissolved in water. 0.2500mol of AgNO3 was required to precipitate all the chloride ions from the solution. Calculate the purity (as a mass percentage) of MgCl2 in the sample. Your answer should have four significant figures (round to the nearest hundredth of a percent).
Answer:
[tex]Purity=99\%[/tex]
Explanation:
Hello,
In this case, the undergoing precipitation reaction is:
[tex]MgCl_2+2AgNO_3\rightarrow Mg(NO_3)_2+2AgCl[/tex]
Thus, for the 0.2500 moles of silver nitrate, the following mass of magnesium chloride is consumed (consider their 2:1 molar ratio):
[tex]m_{MgCl_2}=0.2500molAgNO_3*\frac{1molMgCl_2}{2molAgNO_3} *\frac{95.2gMgCl_2}{1molMgCl_2} \\\\m_{MgCl_2}=11.90gMgCl_2[/tex]
Therefore, the purity of the sample is:
[tex]Purity=\frac{11.90g}{12.00g}*100\%\\ \\Purity=99\%[/tex]
Best regards.
Answer: 99. 17%
Explanation:
MgCl2(aq)+2AgNO3(aq)⟶2AgCl(s)+Mg(NO3)2(aq)
(0.2500 mol AgNO3 × 1 mol (MgCl2) /2 mol (AgNO3) × 95.211 g MgCl2 /1 mol MgCl2)
divided by 12.00 g sample = 0.99178 X 100 ≈ 99.18%
In the background information, it was stated that CaF2 has solubility, at room temperature, of 0.00160 g per 100 g of water. How many moles of CaF2 can dissolve in 100 g of water? If the density of a saturated solution of CaF2 is 1.00 g/mL, how many moles of CaF2 will dissolve in exactly 1.00 L of solution?
Answer:
2.05*10⁻⁵ moles of CF₂ can dissolve in 100 g of water.
12.82 moles of CaF₂ will dissolve in exactly 1.00 L of solution
Explanation:
First, by definition of solubility, in 100 g of water there are 0.0016 g of CaF₂. So, to know how many moles are 0.0016 g, you must know the molar mass of the compound. For that you know:
Ca: 40 g/moleF: 19 g/moleSo the molar mass of CaF₂ is:
CaF₂= 40 g/mole + 2*19 g/mole= 78 g/mole
Now you can apply the following rule of three: if there are 78 grams of CaF₂ in 1 mole, in 0.0016 grams of the compound how many moles are there?
[tex]moles=\frac{0.0016 grams*1 mole}{78 grams}[/tex]
moles=2.05*10⁻⁵
2.05*10⁻⁵ moles of CF₂ can dissolve in 100 g of water.
Now, to answer the following question, you can apply the following rule of three: if by definition of density in 1 mL there is 1 g of CaF₂, in 1000 mL (where 1L = 1000mL) how much mass of the compound is there?
[tex]mass of CaF_{2}=\frac{1000 mL*1g}{1mL}[/tex]
mass of CaF₂= 1000 g
Now you can apply the following rule of three: if there are 78 grams of CaF₂ in 1 mole, in 1000 grams of the compound how many moles are there?
[tex]moles=\frac{1000 grams*1 mole}{78 grams}[/tex]
moles=12.82
12.82 moles of CaF₂ will dissolve in exactly 1.00 L of solution
what is the mass of 3.50 moles of silicon dioxide
Answer:
210. g
Explanation:
SiO2 molar mass=60.09 g/mol
3.50 mol * 60.09 g/mol = 210. g
A water molecule consists of an oxygen atom and two hydrogen atoms covalently bonded in a bent shape. Oxygen however, attracts the shared electrons more strongly than the hydrogen atoms. This structure leads to which important property of water?a. Water is non-polar, which means it has an uneven distribution of charge making it a good solvent of other non-polar molecules.b. Water is non-polar, which means it an an even distribution of charge making it a good solvent of polar molecules.c. Water is polar, which means it has an even distribution of charge making it a good solvent of non-polar molecules.d. Water is polar, which means it has an uneven distribution of charge making it a good solvent of other polar molecules.
Answer:
D.
Explanation:
Water is polar, for one thing. Polar mixes with polar, nonpolar mixes wih nonpolar. This leaves D.
A discharging lead-acid battery is best described as
1.) chemical cells that use an electrical current
2.) chemical cells that produce an electrical current
3.)electrolytic cells that use an electric current
4.)electrolytic cells that produce an electric current
Answer:
chemical cells that produce an electrical current
Explanation:
lead acid battery is a type of chemical cell, that discharges to produce electrical current.
lead acid battery uses lead peroxide for the conversion of the chemical energy into electrical power when it is discharging. It is also rechargeable, that is, it can convert electrical energy back to chemical energy during charging.
Thus, a discharging lead acid battery is best described as a chemical cells that produce an electrical current
Answer:
The correct option is;
2.) Chemical cells that produce an electric current
Explanation:
A discharging lead-acid battery is an electrochemical cell that produces electrical energy through the chemical reaction taking place at the battery electrodes which have lead as the anode and lead oxide as the cathode which result in the flow of an electric current, thereby converting chemical energy of the lead, lead oxide and aqueous sulfuric acid system into electrical energy, therefore, it is a chemical cell that produces an electric current.
Magine that you have a metal bar sitting half in the Sun and half in the dark. On a sunny day, the part of the metal that has been sitting in the Sun feels hot. If you touch the part of the metal bar that has been sitting in the dark, will it feel hot or cold?
Answer:
The metal will feel hot.
Explanation:
Metals are known for their high thermal conductivity. If one part of the metal feels hot, the other will as well.
_______________________________________________________
This piece of metal has been exposed to the sun, and will feel hot after a certain amount of time. By the statement above, the unexposed part will feel hot as well.
Hope that helps!
An aluminum can weighing 10 g absorbs 106.8 J of heat and warms by 12oC. What is the specific heat of the aluminum can?
Answer:
THE SPECIFIC HEAT CAPACITY OF THE ALUMINIUM CAN IS 0.03747 J/g K
Explanation:
Heat liberated (Q) = MCΔT
Heat = 106.8 J
M = mass = 10 g
ΔT = 12°C= 12 + 273 K = 285 K
C = specific heat capacity = unknown
At a rise in 12 °C temperature, the aluminium can possesses a specific heat capacity of =
C = Q / MΔT
C = 106.8 J / 10 g * 285 K
C = 106.8 J / 2850 g K
C = 0.03747 J/g K
The specific heat capacity of the aluminum can weighing 10 g and absorbs 106.8 J of heat after been warmed to 12°C is 0.03747 J/ g K
Answer:
The specific heat of the aluminium can is 0.89 J/g°C
Explanation:
Step 1: Data given
Mass of the aluminium can = 10.0 grams
The amount of energy absorbed = 106.8 J
The temperature rises 12.0 °C
Step 2: Calculate the specific heat of the aluminium can
Q = m*c* ΔT
⇒with Q = the heat absorbed = 106.8 J
⇒with m = the mass of the aluminium can = 10.0 grams
⇒with c = the specific heat of the aluminium can = TO BE DETERMINED
⇒with ΔT = the rise of the temperature = 1.0°C
106.8 J = 10.0 grams * C * 12.0 °C
C = 106.8 J / (10.0 grams * 12.0 °C)
C = 0.89 J/g°C
The specific heat of the aluminium can is 0.89 J/g°C
Methanol CH3OH is the simplest of the alcohols . It is sinthesized by the reaction of hydrogen and carbon monoxide.
CO + H2 -----------> CH3OH
a) If 500 ml CO and 750 mol H2 are present, which is the limiting reactant?
b) How many mols of excess reactant remain unchange?
c) How many moles of CH3OH are formed ?
Answer:
a) CO is the limiting reactant.
b) [tex]n_{H_2}^{excess}=749.9592molH_2[/tex]
c) [tex]n_{CH_3OH}=0.0204molCH_3OH[/tex]
Explanation:
Hello,
In this case, the balanced chemical reaction:
[tex]CO + 2H_2 \rightarrow CH_3OH[/tex]
So we proceed as follows:
a) We first compute the moles of CO by using its density (0.00114 g/mL) and molar mass (28 g/mol):
[tex]n_{CO}=500mLCO*\frac{0.00114gCO}{1mLCO}*\frac{1molCO}{28gCO}=0.0204molCO[/tex]
Next, with the given 750 moles of hydrogen, we can compute the moles of carbon monoxide that are consumed by such amount of hydrogen by using their 1:2 molar ratio:
[tex]n_{CO}^{consumed\ by\ H_2}=750molH_2*\frac{1molCO}{2molH_2}=375molCO[/tex]
Thus, we see a clear excess of hydrogen, for that reason the carbon monoxide is the limiting reactant.
b) In this case, we first compute the moles of CO that are not consumed:
[tex]n_{CO}^{unchanged}=375mol-0.0204mol=374.9796molCO[/tex]
Next, we use the 1:2 molar ratio again to compute the unchanged moles of hydrogen which is the excess reactant:
[tex]n_{H_2}^{excess}=375.9796molCO*\frac{2molH_2}{1molCO} =749.9592molH_2[/tex]
c) Finally, we use the reacting moles of carbon monoxide to compute the formed moles of methanol by using the 1:1 molar ratio:
[tex]n_{CH_3OH}=0.0204molCO*\frac{1molCH_3OH}{1molCO} =0.0204molCH_3OH[/tex]
Best regards.
3. The following data of decomposition reaction of thionyl chloride (SO2Cl2) were collected at a certain temperature and the concentration of SO2Cl2 were monitored as shown in the table.
SO2Cl2 (g) SO2 (g) + Cl2 (g)
Time (min) Conc. of SO2Cl2 (mol/L)
0 0.1000
100 0.0876
200 0.0768
300 0.0673
400 0.0590
500 0.0517
600 0.0453
700 0.0397
800 0.0348
900 0.0305
1000 0.0267
1100 0.0234
a) Determine graphically whether the kinetics of the reaction is zero order, first order or second order with respect to SO2Cl2 and then write the rate equation.
b) Determine the rate constant (k) of the reaction.
c) Determine the half-life (t½) for the reaction.
d) What will be the concentration of SO2Cl2 left in the reaction mixture at 1500 minutes?
Answer:
a) First-order.
b) 0.013 min⁻¹
c) 53.3 min.
d) 0.0142M
Explanation:
Hello,
In this case, on the attached document, we can notice the corresponding plot for each possible order of reaction. Thus, we should remember that in zeroth-order we plot the concentration of the reactant (SO2Cl2 ) versus the time, in first-order the natural logarithm of the concentration of the reactant (SO2Cl2 ) versus the time and in second-order reactions the inverse of the concentration of the reactant (SO2Cl2 ) versus the time.
a) In such a way, we realize the best fit is exhibited by the first-order model which shows a straight line (R=1) which has a slope of -0.0013 and an intercept of -2.3025 (natural logarithm of 0.1 which corresponds to the initial concentration). Therefore, the reaction has a first-order kinetics.
b) Since the slope is -0.0013 (take two random values), the rate constant is 0.013 min⁻¹:
[tex]m=\frac{ln(0.0768)-ln(0.0876)}{200min-100min} =-0.0013min^{-1}[/tex]
c) Half life for first-order kinetics is computed by:
[tex]t_{1/2}=\frac{ln(2)}{k}=\frac{ln(2)}{0.013min^{-1}} =53.3min[/tex]
d) Here, we compute the concentration via the integrated rate law once 1500 minutes have passed:
[tex]C=C_0exp(-kt)=0.1Mexp(-0.013min^{-1}*1500min)\\\\C=0.0142M[/tex]
Best regards.
Burning a compound of calcium, carbon and nitrogen in oxygen generates calcium oxide (CaO), carbon dioxide (CO2) and nitrogen dioxide (NO2). A small sample gives 3.106 g CaO, 2.439 g CO2, and 5.097g NO2. Determine the empirical formula of the compound.
Answer:
CaCN₂
Explanation:
A compound of calcium, carbon and nitrogen CaₐCₓNₙ in oxygen will burning producing:
CaₐCₓNₙ + O₂ → aCaO + xCO₂ + nNO₂
Moles of the oxides CaO, CO₂, NO₂ are:
CaO: 3.106g ₓ (1 mole / 56.08g) = 0.0554 moles of CaO = moles of Ca
CO₂: 2.439g ₓ (1mole / 44g) = 0.0554 moles CO₂ = moles C
NO₂: 5.097g ₓ (1mole / 46g) = 0.111 moles NO₂ = moles N
Empirical formula is the chemical formula that represents the simplest ratio of elements in a compound.
Having as basis 0.0554 moles (The lower number of moles):
0.0554 moles Ca / 0.0554 = 1 Ca
0.0554 moles C / 0.0554 = 1 C
0.111 moles N / 0.0554 = 2N
Thus, the compound CaₐCₓNₙ has as empirical formula:
Ca₁C₁N₂ = CaCN₂
Aqueous hydrobromic acid reacts with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . If of water is produced from the reaction of of hydrobromic acid and of sodium hydroxide, calculate the percent yield of water. Round your answer to significant figures.
Answer:
See explanation below
Explanation:
You are missing certain data. I found one, in the attached picture. All you have to do is replace your data in this procedure to get an accurate answer.
According to the picture attached, we have 2.4 g of HBr and 1.9 g of NaOH. This mix produces 0.411 g of water. To get the %yield of water, we first need to see how many theorical grams of water are formed. With this we can calculate the %yield.
The overall reaction is:
HBr + NaOH --------> NaBr + H₂O
We have a mole ratio of 1:1 so, let's see which is the limiting reactant between the acid and the base, using the reported molar mass for each (MM HBr = 80.9119 g/mol; MM NaOH = 39.997 g/mol)
moles HBr = 2.4 / 80.9119 = 0.02966 moles
moles NaOH = 1.9 / 39.997 = 0.0475 moles
So, we can clearly see that the moles of NaOH are in excess, so the HBr is the limiting reactant.
As we have a mole ratio of 1:1 with each compound here, and that the HBr is the limiting reactant we can say that:
moles HBr = moles H₂O = 0.02966 moles of water
Now, using the molar mass of water, let's calculate the theorical yield of water: (MM water = 18.01528 g/mol
m H₂O = 0.02966 * 18.01528 = 0.534 g
We have the theorical yield, let's calculate the % yield:
% = 0.411 / 0.534 * 100
% = 76.92%
Select all the true statements. Group of answer choices The +3 oxidation state is characteristic of the actinides. All actinides are radioactive. Cerium (Ce) rnakes 100th in abundance (by mass %). Valence-state electronegativity is when a metal with a positive oxidation state has a greater attraction for the bonded electrons (thus a higher electronegativity) than it does when it has a 0 oxidation state. The actinides are silvery and chemically reactive. The lanthanides are in Period 7.
Answer:
The +3 oxidation state is characteristic of the actinides.
All actinides are radioactive.
Cerium (Ce) rnakes 100th in abundance (by mass %).
The actinides are silvery and chemically reactive.
In the periodic table,the The +3 oxidation state is characteristic of the actinides. All actinides are radioactive.The actinides are silvery and chemically reactive.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
Learn more about periodic table,here:
https://brainly.com/question/11155928
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Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(ii) nitrate. refer to the solubility rules. Provide the complete ionic equation, net ionic equation and spectator ions for https://tex.z-dn.net/?f=%28NH_4%29_2S%28aq.%29%2BCu%28NO_3%29_2%28aq.%29%5Crightarrow%20CuS%28s%29%2B2NH_4NO_3%28aq.%29
Answer:
- The precipitate that forms from the reaction of Ammonium Sulfide and Copper (II) Nitrate is the insoluble Copper (II) Sulfide (CuS).
- Overall ionic equation
2NH₄⁺ + S²⁻ + Cu²⁺ + 2NO₃⁻ → 2NH₄⁺ + 2NO₃⁻ + CuS (s)
- Net Ionic equation
S²⁻ + Cu²⁺ → CuS (s)
Or better written as
Cu²⁺ + S²⁻ → CuS (s)
Spectator ions include 2NH₄⁺ and 2NO₃⁻.
Explanation:
Ammonium Sulfide - (NH₄)₂S
Copper (II) Nitrate - Cu(NO₃)₂
The overall equation for this reaction is a double displacement reaction and the balance form is represented by
(NH₄)₂S (aq) + Cu(NO₃)₂ (aq) → 2NH₄NO₃ (aq) + CuS (s)
Copper (II) Sulfide (CuS) is the insoluble precipitate formed from this reaction.
Note that the compounds in aqueous form are the ones that can allow the existence in ionic form, the insoluble solid compound stays in that form without ionizing, hence, the overall ionic equation is
2NH₄⁺ + S²⁻ + Cu²⁺ + 2NO₃⁻ → 2NH₄⁺ + 2NO₃⁻ + CuS (s)
Then, the ions that occur on both sides of the overall ionic equation, are called spectator ions and they include 2NH₄⁺ and 2NO₃⁻.
These spectator ions can then cancel out, leaving us with the net ionic equation
S²⁻ + Cu²⁺ → CuS (s)
Hope this Helps!!!
According to Rutherford's nuclear theory, the core of an atom (nucleus) contains most of the_____of an atom and is______, so the majority of the mass of a fluorine atom cannot be due to its nine electrons. According to Rutherford's nuclear theory, most of the volume of an atom is empty space, so the volume of a hydrogen atom cannot be mostly due to the proton. According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is_____the number of positively charged particles within the nucleus, so a nitrogen atom has 7 protons and 7 electrons, while a phosphorous atom cannot have 15 protons and 150 electrons.
Answer:
matter, dense, equal
Explanation:
According to Rutherford's nuclear theory, the core of an atom (nucleus) contains most of the matter of an atom and is dense, so the majority of the mass of a fluorine atom cannot be due to its nine electrons. According to Rutherford's nuclear theory, most of the volume of an atom is empty space, so the volume of a hydrogen atom cannot be mostly due to the proton. According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is equal the number of positively charged particles within the nucleus, so a nitrogen atom has 7 protons and 7 electrons, while a phosphorous atom cannot have 15 protons and 150 electrons.
Write the condensed structural formula of the ester formed when each Of the following reacts with methanol. For example, the ester formed when propanoic acid (CH3CH2COOH) reacts With methanol (HOCH3) is CH3CH2COOCH3.
a. acetic acid (CH3COOH)
b. butanoic acid
Answer:
1. Methyl ethanoate i.e CH3COOCH3
2. Methyl butanoate i.e CH3CH2CH2COOCH3
Explanation:
The reaction between an organic acid and alcohol is called esterification in which an ester is formed along side with water.
Thus, the name ester formed can be obtained as follow:
1. Reaction of acetic acid, CH3COOH with methanol, CH3OH.
CH3COOH + HOCH3 –> CH3COOCH3 + H2O
The name of the ester formed is methyl ethanoate i.e CH3COOCH3
2. Reaction of butanoic acid, CH3CH2CH2COOH with methanol, CH3OH.
CH3CH2CH2COOH + HOCH3 —> CH3CH2CH2COOCH3 + H2O
The name of the ester formed is methyl butanoate i.e CH3CH2CH2COOCH3
At a festival, spherical balloons with a radius of 170.cm are to be inflated with hot air and released. The air at the festival will have a temperature of 25°C and must be heated to 100°C to make the balloons float. 1.00kg of butane C4H10 fuel are available to be burned to heat the air. Calculate the maximum number of balloons that can be inflated with hot air.
Answer:
The correct answer is 1.5 balloons.
Explanation:
Based on the given question, the radius of the spherical balloons is 170 cm. Therefore, the volume of each balloon will be,
= 4/3 × π × (170)³ cm³
= 20.5176 × 10⁶ cm³
= 20.5176 m³
The density of air at 100 degree C s 0.946 Kg m⁻³
The mass of air in each balloon can be calculated by using the formula,
Mass = density × volume
Mass = 0.946 Kg m⁻³ × 20.5176 m³
Mass = 19.410 Kg
The heat energy, that is, required to bring the air from 25 degree C to 100 degree C will be,
= 19.410 × 10³ g × (100 -25) degree C × 1.009 J/g degree C
= 14.68 × 10⁵ J
The concentration of butane given is 1.00 Kg or 1000 g
The molecular weight of butane is 58.12 g per mole
The moles or n can be calculated by using the formula,
n = mass / mol.wt
n = 1000 g/58.12 g/mol = 17.20 mol
The formation of enthalpy of butane at 25 degree C is 125.7 × 10³ J/mol. The evolution of heat energy that take place at the time of burning 17.20 moles of butane is,
= 125.7 × 10³ J/mol × 17.20 mol
= 2.16 × 10⁶ J
The number of balloons that can be inflated with hot air is,
= 2.16 × 10⁶ J / 14.68 × 10⁵ J per each balloon
= 1.5 balloons
Hence, maximum of 1.5 balloons can be inflated.
A metal ion with a net +1 charge has ten electrons in the 3d subshell. How do I identify the metal?
Explanation:
First off, the + 1 charge means that the metal has lost an electron.
To identify the metal, we have to know the total number of electrons in the 3d sub shell.
Total number of electrons = 1 + 10 = 11
This metal belongs to the fourth period in the periodic table (that's where transition metals begin to occur).
This means that the 11th metal in this period is the metal. That happends to be Copper.
A primary amine contains a five-membered carbon ring. The degree of unsaturation for the five-membered carbon ring is equal to three. In the chemical formula, there are seven carbon atoms. Determine its chemical formula.
Answer:
C₇H₁₁N
Explanation:
To find the chemical formula, first, let's evaluate the given conditions.
1. Is a primary amine:
This means that the amine is connected to a carbon, like NH₂-R
2. The degree of unsaturation of the five-membered carbon ring is equal to three:
One of the degrees of unsaturation is for the five-membered carbon ring, the other two are for pi-bonds. This means that the five-membered carbon ring has 2 pi-bonds inside.
3. There are seven carbon atoms:
Five of these seven carbons are for the carbon ring and the other two are bonded to the primary amine.
From all of the above, we have that the chemical formula is:
C₅H₅-C₂H₄-NH₂ = C₇H₁₁N
I hope it helps you!
The bitter taste often associated with leafy green vegetables such as spinach, parsley, and cilantro is often due to oxalic acid, which has a molecular weight of 90.04g. The percentage of the acid present can be determined through an acid-base titration with NaOH once the sample has been prepared and the oxalic acid is extracted into an aqueous solution. A 100.0-g sample was treated so that all of the oxalic acid dissolved. Because the solution was intensely green due to chlorophyll, an indicator could not be used, and the titration was monitored using pH meter. The following data were obtained. Concentration of NaOH -0.693 M volume 0.00 pH 1.63 2.02 14.00 1.01 12.00 2.49 2.46 10.00 4.56 2.80 8.00 6.01 2.98 pH 7.69 3.16 6.00 8.33 3.23 4.00 3.51 10.72 13.35 2.00 3.91 14.14 4.09 0.00 0 5 10 1516 20 15.41 4.67 15.67 4.97 Volume of NaOH 15.85 5.49 5.79 15.89 (a) How many moles of oxalic acid were present in the 100- g sample? 15.91 6.09 15.95 12.14 16.01 12.74 16.52 13.61 17.06 13.65 (b) Calculate the percentage of oxalic acid in the spinach.
Answer:
1. Moles of oxalic acid in 100 g sample = 0.0055moles
2. Percentage oxalic acid in 100g sample = 0.5%
Explanation:
Check attachment below for explanation and correct chart arrangement
Consider the titration of 1.0 L of 1.0 M NH3 with 1.0 M HCl. Which of the following correctly describe(s) how the pH would be calculated at each of the following additions of HCl? I: At 0 L HCl, pH would be calculated based on the concentration and Kb of the weak base II: At 1 L HCl, pH would be calculated based on the concentration and Ka of the conjugate acid III: At 2 L HCl, pH would be calculated based on the concentration of excess acid in solution Group of answer choices I and III Only II Only I I, II, and III II and III
Answer:
I, II, and III
Explanation:
In the titration of NH₃ with HCl:
NH₃ + HCl → NH₄⁺ + Cl⁻
Where NH₃ is the weak base and NH₄⁺ is the conjugate acid.
I: At 0 L HCl, pH would be calculated based on the concentration and Kb of the weak base: At 0L of HCl, you will have just NH₃ in solution. That means you would calculate the pH just from the concentration of the weak base using Kb. That means I is true.
II: At 1 L HCl, pH would be calculated based on the concentration and Ka of the conjugate acid: When you add 1L of HCl, you will have in solution just NH₄⁺, the conjugate acid. That means you would calculate the pH of the solution just with the Ka of the conjugate acid and its concentration. II is true.
III: At 2 L HCl, pH would be calculated based on the concentration of excess acid in solution: At 2L of HCl solution, you have HCl in excess in the solution. As HCl is a strong acid, the pH would be affected in the big way by this concentration in excess. III is true.
Why would it be important to use a homogeneous mixture instead of a heterogeneous mixture for a
specific application?
A homogeneous mixture has different properties throughout, but this would not
affect the use of a material for a specific application.
A homogeneous mixture has the same properties for every part of the mixture, so
the quality of the material is consistent.
A homogeneous mixture has the same appearance throughout, even if it has
different properties.
A homogeneous mixture has all of the required components, and this is the most
important part of using a material for a specific application.
The correct answer is B. A homogeneous mixture has the same properties for every part of the mixture, so the quality of the material is consistent.
Explanation:
In a homogenous mixture, all the components are equally integrated; this means the final result in the case of a material is a material that looks uniform and also has the same properties in every part of section. This homogeneity and consistency are especially important if you are testing the properties of the material or using it for a specific application because if you use a homogenous mixture the quality and properties will be consistent and thus you can obtain consistent results.
If 0.089 grams of KI is dissolved in 500g of H2O, what is the concentration of the resulting solution in parts per million?
Answer:
The concentration of the resulting solution in parts per million is 177.97
Explanation:
Parts per million (ppm), is a unit of measure for concentration that refers to the number of units of the substance per million units of the set.
The concentration in parts per million expressed in mass / mass is calculated by dividing the mass of the solute (ms) by the mass of the solution (md, sum of the mass of the solute and the mass of the solvent), both expressed in the same unit and multiplied by 10⁶ (1 million).
[tex]ppm=\frac{ms}{md} *10^{6}[/tex]
So, being:
ms: 0.089 grams of KImd: 0.089 grams of KI + 500 grams of H₂O= 500.089 gramsReplacing:
[tex]ppm=\frac{0.089 grams}{500.089 grams}*10^{6}[/tex]
ppm= 177.97
The concentration of the resulting solution in parts per million is 177.97
Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum number of grams of iodine gas that can be produced from a reaction of 10.0 g of iodine pentafluoride with 11.20 L of iodine fluoride gas at STP
Answer:
63.45g of I₂ can be produced
Explanation:
IF₅ reacts with IF to produce IF₇ and I₂. The reaction is:
IF₅ + 2 IF → IF₇ + I₂
Moles of 10.0g of IF₅ (221.89g/mol):
10.0g IF₅ × (1mol / 221.89g) = 0.0451 moles of IF₅
Using PV / RT = n, it is possible to find moles of 11.20L of IF, thus:
1atm×11.20L / 0.082atmL/molK × 273K = 0.500 moles of IF.
At STP, pressure is 1atm, temperature is 273K and gas constant R is 0.082atmL/molK
For a complete reaction of IF₅ you need:
0.0451 moles of IF₅ × (2 moles IF / 1 mole IF₅) = 0.902 moles of IF. As you have just 0.500 moles of IF, the IF is the limiting reactant.
2 moles of IF produce 1 mole of I₂. 0.500 moles of IF produce:
0.500mol IF ₓ ( 1 mol I₂ / 2 mol IF) = 0.250 mol I₂
As molar mass of I₂ is 253.81g/mol, mass of 0.250 mol I₂ are:
0.250mol I₂ ₓ (253.81g / mol) =
63.45g of I₂ can be produced