use a strong base to neutralize, like NaOH, KOH, etc
How many grams of aluminum will
react fully with 1.25 moles Cl₂?
2Al + 3Cl₂ → 2AlCl₃
mol Al = 2/3 x 1.25 = 0.83
mass Al = 0.83 x 27 g/mol = 22.41 g
According to the stoichiometry 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical reactions.
According to the chemical reaction between aluminium and chlorine, 2 moles of aluminium reacts with 3 moles of chlorine , thus,1.25 moles of chlorine will react 1.25×2/3=0.83 moles which is mass of aluminium =0.83×26=21.66 g.
Thus, 21.66 grams of aluminum will react fully with 1.25 moles Cl₂.
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Which feature of a balanced chemical equation demonstrates the law of
conservation of mass?
A. It shows the products of a chemical reaction to the right of the
reaction arrow.
OB. It shows the reactants of a chemical reaction to the left of the
reaction arrow.
C. It has the same types of atoms on both sides of the reaction
arrow.
O
D. It has coefficients to show how much of each substance a
chemical reaction uses.
Answer:
C. It has the same types of atoms on both sides of the reaction arrow.
What is a chemical equation?A chemical equation is a symbolic representation of a chemical reaction; Reactants are represented on the left and the products on the right.
The law of conservation of mass states that in a closed system, mass is neither created nor destroyed during a chemical or physical reaction. The law of conservation of mass is applied whenever you balance a chemical equation. It is also applicable to stoichiometry. A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
Consider the balanced equation for the combustion of methane.
[tex]CH_4 + 20_2 \implies CO_2 + 2H_2O[/tex]
All balanced chemical equations must have the same number of each type of atom on both sides of the arrow.
In this equation, we have 1 C atom, 4 H atoms, and 4 O atoms on each side of the arrow.
The number of atoms does not change, so the total mass of all the atoms is the same before and after the reaction. Mass is conserved.
The same atoms of the same element that are present in the reactants are also present in the products, according to the rule of conservation of matter.
This leads us to believe that the response to the question is true because: It has the same atom kinds on both sides of the reaction arrow (Option C)
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The absorption spectrum of sodium is shown below. What do the two dark
vertical lines in the spectrum show about sodium atoms?
Absorption spectrum
700
600
500
400 nm
OA. A sodium atom gives off all wavelengths except those two when
an electron moves to lower energy levels.
OB. A sodium atom gives off those two wavelengths when an electron
moves to a higher energy level.
OC. Only those two wavelengths can cause an electron to move to a
higher energy level.
OD. All wavelengths except those two cause an electron to move to a
lower energy level.
SUBMIT
The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Hence, Option (D) is correct
What is Absorption Spectrum ?
A spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption at specific wavelengths.
The given fact is explained by the energy levels that electrons may be in are quantized, or vary by a specific amount.
When electrons go from one energy level to another, the difference in those energy level is a specific value, and not a range of values.
If they are transitioning upwards towards a higher energy, they will absorb the photons corresponding to the wavelength of light which has the specific amount of energy they need to ascend, resulting in dark lines.
Similarly, when the electrons transition from higher to lower energy, the same specific amount of energy is released and the emission spectrum shows lines in the places where the absorption spectrum was dark.
Hence, The two dark vertical lines in the spectrum shows that all wavelengths except those two cause an electron to move to a lower energy level. Therefore, Option (D) is correct
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When molten magma cools ________ under the surface, it forms _________ igneous rocks.
A. rapidly, extrusive
B. slowly, extrusive
C. rapidly, intrusive
D. slowly, intrusive
The pressure of a sample of helium is 1.556 atm in a 268.5 mL container. If the container is compressed to 112.4 mL without changing the temperature, what is the new pressure?
a. 3.72
b. 0.651
c. 1.94e4
d. 277
Answer:
a. 3.72 [atm]
Explanation:
For a gas at constant temperature, (with no change in number of molecules of the gas), we can apply Boyle's Law: [tex]P_1V_1=P_2V_2[/tex]
[tex](1.556[atm])(268.5[mL])=P_2(112.4[mL])[/tex]
[tex]\dfrac{(1.556[atm])(268.5[mL\!\!\!\!\!\!\!\!{--}])}{112.4[mL \!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----})}{112.4[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{-----}}[/tex]
[tex]3.716957[atm]=P_2[/tex]
It seems like the answer should have 4 significant figures since all of the other quantities have 4 significant figures, but the closest answer choice of those provided is a. 3.72
How many moles of hydrogen
gas will be produced at the same
time as 138 g NaOH?
2Na+ 2H₂O → 2NaOH + H₂
Answer:
1.72 moles of H₂
Explanation:
The balanced equation
2Na+ 2H₂O → 2NaOH + 1C
tells us we'll get 1 mole of H₂ for every 2 moles of NaOH. We can express this as a molar ratio: (1 mole H₂)/(2 moles NaOH).
The reaction produces 138 g of NaOH. Divide this mass by the molar mass of NaOH (39.99 g/mole)to obtain moles NaOH:
138g NaOH/(40 g/mole) = 3.45 moles of NaOH.
To find the moles H₂ produced, we can multiply the moles NaOH by the molar ratio from above:
(3.45 moles NaOH)*((1 mole H₂)/(2 moles NaOH) = (3.45/2) moles H₂. [Note how the "moles NaOH" unit cancels, leaving just "moles H₂"]
We should produce 1.72 moles of H₂.
A student was given a mixture of iron of iron fillings and sulphur. He was told to heat it and observe the compound.
(a) What is coloured formed.
(b) Write the effect of magnet on it.
(c) Write the action of carbon disulphide on it.
(d) Describe the effect of adding dilute hydrochloric acid to it. ldentify the gas and write its two properties.
Answer:
a) Black
b) Non-magnetic
c) No reaction with carbon disulphide.
d) i don't know sry
But i had to go through my 6th grade notes for this .____.
What are chloroethane's conditions?
Please help me
Thanks
Explanation:
Hi there!
Chloroethane requires atleast one chlorine in ethane. It's general formula is CnH2n+1Cl. It mean it must have 2 carbons, 5 hydrogens and atleast one chlorine.
In addition, carbon-carbon bond must be single and chlorine is attached to either carbons. The carbon of this compound is SP³ hybridized and has bond angle of 120°.
Hope it helps!
What mass of solute will dissolve in 100g of water at the following temperatures?
• KNO3 at 70°C =
• NaCl at 100°C=
• NH₂Cl at 90°C=
[tex]KNO_3[/tex] at 70°C = 130 gram
NaCl at 100°C= 40 gram
NH₂Cl at 90°C= 70 gram
What is solubility?Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Amount of a substance (called the solute) that dissolves in a unit volume of a liquid substance (called the solvent) to form a saturated solution under specified conditions of temperature and pressure. Solubility is expressed usually as moles of solute per 100 grams of solvent.
Hence,
[tex]KNO_3[/tex] at 70°C = 130 gram
NaCl at 100°C= 40 gram
NH₂Cl at 90°C= 70 gram
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why is the nitrogen important to humans
Nitrogen is important for all humans because it is a major part of amino acids, which are the building constituents of proteins and of nucleic acids such as deoxyribonucleic acid, which transfers genetic information to the next generation.
What is the nitrogen cycle?It is the biogeochemical circuit that supplies nitrogen to living things and keeps it circulating in the biosphere.
Importance of the nitrogen :
The nitrogen that is part of the atmosphere in the form of N₂ cannot be used by animals and plants, and for this reason, this mechanism is needed to convert the N₂ into usable forms.Following the order of the food chain, the nitrogen in the plants passes to the herbivorous animals and then to the carnivores, spreading between the different links of the food pyramid.Humans use nitrogen to make amino acids, proteins, nucleic acids, and DNA.Therefore, we can conclude that the nitrogen is a vital circuit for the existence of Humans and all other living organism since we are unable to fix nitrogen from its gaseous form.
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the electron configuration for sodium is 1s22s22p63s1. which subshell is said to contain the valence electron(s) for sodium?
The subshell that contains the valence electron for sodium is the s subshell
Valence electronsValence electrons are the electrons located at the outermost shell of an atom
From the question, we are to determine the subshell that contains the valence electron(s) for sodium
The given electronic configuration for sodium is
1s²2s²2p⁶3s¹
The valence electron is the electron in the 3s orbital.
Hence, the subshell that contains the valence electron for sodium is s subshell
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Write the half reaction equations at the cathode and anode
A redox reaction is one in which oxidation and reduction occurs.
What is a redox reaction?A redox reaction is one in which oxidation and reduction occurs. Oxidation involves electron loss while reduction involves electron gain.
For the compound NaI;
The oxidation half equation is - 2Na(s) --->2Na^+(aq) + 2e
The reduction half equation is - I2 + 2e ---->2 I^-(aq)
Missing parts:
Write the anode half-reaction and cathode half-reaction for NaI.
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The 225 g FeCl2 is about 1.8 moles.
What is the molar concentration of
the solution if the total volume is
450 mL?
Answer:
[tex]4 \frac{mol}{l} [/tex]
Explanation:
From the question, we have been asked to find the molarity of FeCl2 having a volume of 450 mL,
We have been provided with 225 g which is proportional to 1.8 moles.
We know that molarity of any solution should be in mol/L.
1 mole contained in 1 L means it has a molarity of 1 mol/L
Let's convert 450 mL to Litres which is,
[tex] \frac{450}{1000} litres[/tex]
= 0.450 L
Thus,
1 mole is contained in 1L
x moles are contained in 0.450 L
Hence,
x mole/molarity = {1 mole x 1 L}/{0.450 L}
= 4 mol/L
Therefore 4 mol/L is the molar concentration.
predict the missing component in the nuclear equation
The answer is C since both charge and mass have to be balanced on both sides of the equation.
7.0 mol Mn reacts with 5.0 mol
O2 according to the equation below:
2Mn+0₂ → 2MnO
How many moles of MnO form from7.0 mol Mn?
[?] mol MnO
Round your answer to the tenths place.
Answer:
= 7 moles Mno
Explanation:
We have been asked to determine the number of moles required to form MnO.
Mole ratio
Mn : MnO = 1 : 1
The reaction ratio therefore is 1 : 1
Thus 7 moles of Mn react to form 7 moles MnO since we have similar ratio.
Answer:
The answer that I got was 7.0.
Explanation:
It said round to the tenths place so put the .0 after the seven and see if that helps.
HELPP!!!
A 6.28 L balloon is filled with water at 3.93 atm. If the balloon is
squeezed into a 3.25 L beaker and does NOT burst, what is the
pressure of water in the balloon?
a. 7.59
b. 2.03
c. 80.2
d. 0.0893
An atom is determined to contain 13 protons 10 electrons and 12 neutrons what are the mass number and charge of this atom or ion
Mass number 24 charge +2
Mass number 22 charge neutral
Mass number 34 charge -2
Mass number 34 charge +2
The mass number and charge of this atom or ion is 24 and charge +2
What is mass number ?
The mass number is equals to the total number of protons and neutrons in a nucleus.
In the give question, The number of neutrons is a distractor.
Only the number of electrons versus the number of protons determines ionic charge. The charge of the ion is +2
Hence, The mass number and charge of this atom or ion is 24 and charge +2
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What is periodicity?
the quality of being periodic the tangency to record the intervals
the prediotic of the sun sports cycle
The pH of a solution is measured as 8.3. What is the hydrogen ion
concentration of the solution?
OA. 2.0 x 108 M
OB. 8.0 x 10-³ M
OC. 8.3 M
OD. 5.0 x 109 M
Answer:
D.) 5.0 x 10⁻⁹ M
Explanation:
The formula displaying the relationship between pH and hydrogen ion concentration is:
pH = -log[H⁺]
In this formula "[H⁺]" represents the concentration of hydrogen ions (given in molarity (M)). Therefore, to find this value, you need to take the inverse of the log. The manipulation looks like this:
pH = -log[H⁺] ------------> [H⁺] = 10^-pH
Note that the carrot (^) represents an exponent. Now, you can plug your pH value into the equation to find the molarity.
[H⁺] = 10^-pH
[H⁺] = 10^-8.3
[H⁺] = 5.0 x 10⁻⁹ M
You test your hypothesis by completing a(n) _________.
You test your hypothesis by completing an experiment.
How we test our hypothesis?We test our hypothesis by performing experiment or research because in an experiment, we test our hypothesis and collect data in order to draw a conclusion from it.
So we can conclude that you test your hypothesis by completing an experiment.
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A scuba diver uses compressed air to breath under water. He starts with an air volume of 3.20 L at sea level (1 atm) at a temperature of 30°C. What is the volume of air in his tank at a depth of 100 ft (3 atm) and a temperature of 24°C?
2.56 L is the volume of air in his tank at a depth of 100 ft (3 atm) and a temperature of 24°C.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]P_1=1 atm[/tex]
[tex]V_1=3.20 L[/tex]
[tex]T_1[/tex]=30°C
[tex]P_2=3 atm[/tex]
[tex]V_2=?[/tex]
[tex]T_2=24°C[/tex]
Using the equation:
[tex]\frac{P_1V_1}{T_1}[/tex] =[tex]\frac{P_2V_2}{T_2}[/tex]
[tex]V_2[/tex] =(1 atm x 3.20 L x 24°C) ÷ 30°C
[tex]V_2[/tex] = 2.56 L
Hence, 2.56 L is the volume of air in his tank at a depth of 100 ft (3 atm) and a temperature of 24°C.
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You are trying to determine the
freezing point for a 0.195 m
baqueous solution of K₂S.
How many particles does K2S
dissociate into?
From the equation; there are three particles in solution.
What is freezing point?The term freezing point is the temperature at which a liquid substance is converted to solid. We know that this is colligative property thus it depends on the number of particles in solution.
The dissolution of K₂S gives us;
K₂S(s) ----> 2K^+(aq) + S^2-(aq)
This implies that there are three particles in solution.
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The theoretical yield of NaBr from
2.36 mol FeBr3 is 7.08 mol NaBr.
What is the percent yield if 6.14 mol
NaBr were collected?
[?]%
Taking into account definition of percent yield, the percent yield for the reaction is 100%.
Reaction stoichiometryIn first place, the balanced reaction is:
2 FeBr₃ + 3 Na₂S → Fе₂S₃ + 6 NaBr
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
FeBr₃: 2 moles Na₂S; 3 molesFе₂S₃: 1 mole NaBr: 6 molesMoles of NaBr formedThe following rule of three can be applied: if by reaction stoichiometry 2 moles of FeBr₃ form 6 moles of NaBr, 2.36 moles of FeBr₃ form how many moles of NaBr?
[tex]moles of NaBr=\frac{2.36 moles of FeBr_{3}x6 moles of NaBr }{2 moles of FeBr_{3}}[/tex]
moles of NaBr= 7.08 moles
Then, 7.08 moles of NaBr can be produced from 2.36 moles of FeBr₃.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield=\frac{actual yield}{theorical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, being the molar mass of NaBr 102.9 g/mole, you know:
actual yield= 7.08 moles× 102.9 g/mole= 728.532 gramstheorical yield= 7.08 moles× 102.9 g/mole= 728.532 gramsReplacing in the definition of percent yields:
[tex]percent yield=\frac{728.532 grams}{728.532 grams}x100[/tex]
Solving:
percent yield= 100%
Finally, the percent yield for the reaction is 100%.
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Answer: 87%
Explanation:
Which of the following lists describes characteristics of a base?
Bitter taste, low pH, and dissolves metals
Sour taste, high pH, and caustic
Sour taste, low pH, and slippery
Slippery, high pH, and caustic
Answer:
Option D
Explanation:
Bases are causticsour taste refers to acid hence B is wrong
Bases have pH higher than 7 so D is the correct answer
Answer:
Slippery, high pH, and caustic
(last option listed)
Explanation:
sour taste - acid feature
pH < 7 - acid feature [low pH]
dissolves metal - strong acid feature
bitter taste - base feature
slippery feel - base feature
pH > 7 - base feature [high pH]
dissolves metal - strong base feature
[essentially, traits of base can be described as opposites of acid traits]
So, if you combine these traits, "Slippery, high pH, and caustic" best describes characteristics of a base
Which two types of waves can transmit energy through a vacuum?
Answer:
electromagnetic waves and mechanical waves
Explanation:
I think these two kinds of waves can transmit energy through a vaccume.
Hope I helped!
Electromagnetic waves.
Gravity waves.
If 0.507J of heat leads to a 0.007 degree C change in water, what mass is present?
Answer:
17.25g
Explanation:
From our question, we have been asked to find the mass of water present.
The formula for finding specific heat is given by;
Q = mCp∆T
We have, Q = 0.507 J, ∆T = 0.007° C and we know that Cp of water is 4.2 J/g°C
Rearrange the formula making m the subject.
Which is given by;
m = (Q)/(Cp∆T)
Substituting for the known values
[tex]m \: = \frac{0.507}{4.2 \times 0.007}[/tex]
= 17.24489 g
= 17.25g
Answer:
17.32 gm
Explanation:
Specific heat of water is 4.182 J / g- c
4.182 J /g-c = .507/ ( .007 * gm)
solve for gm = 17.32 gm
eggs do not contain sugar. Explain why they have such high energy values.
Answer:
becuz they have protien inside them dumy its easy
Answer:
because they have protein inside them dummy its easy therefore they did not have sugar
Explanation:
The main component of smog is NO2(g). Smog is a product that is formed through the following series of intermediate chemical reactions.
Answer:
D
Explanation:
bc im smart
The pressure of a gas sample was measured to be 654 mmhg. What is the pressure in kpa? (1 atm = 1. 01325 × 10 5 pa)
Taking into account the change of units, the pressure of the gas sample is 87.19 kPa.
What is rule of threeIn first place, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: [tex]c=\frac{cxb}{a}[/tex]
PressureThe direct rule of three is the rule applied in this case where there is a change of units.
To perform in this case the conversion of units, you must first know that:
1 atm= 760 mmHg1 atm = 1. 01325×10⁵ Pa= 101325 Pa1 kPa= 1000 PaSo, if 1 atm is 760 mmHg, how many atm equals 654 mmHg?
760 mmHg ⇒ 1 atm
654 mmHg ⇒ x
So: [tex]x=\frac{654 mmHgx1 atm}{760 mmHg}[/tex]
Solving:
x=0.86 atm
Now, if 101325 Pa are 1 atm, how many Pa equals 0.86 atm?
1 atm ⇒ 101325 Pa
0.86 atm ⇒ x
So: [tex]x=\frac{0.86 atmx101325 Pa}{1 atm}[/tex]
Solving:
x= 87,192.83 Pa
Finally, if 1 kPa is 1000 Pa, how many kPa equals 87,192.83 Pa?
1000 Pa ⇒ 1 kPa
87,192.83 Pa ⇒ x
So: [tex]x=\frac{87,192.83 Pax1 kPa}{1000 Pa}[/tex]
Solving:
x=87.19283 kPa≅ 87.19 kPa
In summary, the pressure of the gas sample is 87.19 kPa.
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a burning candle wax reacts with oxygen. after a glass jar is placed over it, the candle goes out. what is the limiting reactant?
If the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
What is a limiting reactant?The limiting reactant is the reactant that is present in the least amount. When the limiting reactant is exhausted, the reaction comes to a halt.
Thus, if the candle goes out when a glass jar is placed over it, then oxygen is the limiting reactant.
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