Answer:
1. Q = 8.66 KJ
2. Q = 7.58 Kcal
3. Q = 0.71 KJ
4. Q = 24.31 Kcal
Explanation:
1. The quantity of heat absorbed can be determined by:
Q = mcΔθ
where: Q is the quantity of heat absorbed or released, m is the mass of the substance, c is the specific heat capacity of water = 4.2 j/g[tex]^{0}C[/tex] and Δθ is the change in temperature.
= 45.2 × 4.2 × (76.9 - 31.3)
= 8656.704
∴ Q = 8.66 KJ
The quantity of heat absorbed is 8.66 KJ.
2. Q = mcΔθ + mL
Where L is the latent heat of fusion of ice = 334 J.
= m(cΔθ + L)
= 72.1(4.2 × 25.2 + 334)
Q = 31712.464 J
= 7579.466 calories
The total heat released is 7.58 Kcal.
3. Q = mcΔθ
= 55.5 × 0.129 × (123.4 - 24.6)
= 707.3586
The quantity of heat required to increase the temperature of gold is 0.71 KJ.
4. Q = mL
Where: L is the specific latent heat of vaporization = 533 calories.
Q = 45.6 × 533
= 24304.8
The quantity of heat required to change water to steam is 24.31 Kcal.
Which quantum number describes the energy level of an electron?
Spin quantum number
Principal quantum number
Magnetic quantum number
Angular momentum quantum number
Answer:
principle quantum number :)
Explanation:
I took the test and got it right
Quantum numbers are defined as the set of four numbers with the help of which we can get complete information about the electrons in an atom. The energy level of an electron is given by Principal quantum number. The correct option is B.
What is Principal quantum number?The Principal quantum number represents the main energy level or shell in which the electron is present. It also determines the average distance of the orbital or electron from the nucleus. It is denoted by the letter 'n' and can have any whole number values like 1, 2, 3, 4,....
The value of principal quantum number usually stand for different energy shells K, L, M, N .... the value of 'n' can be any integer with a positive value which is equal to or greater than 1.
The value of 'n' denotes the innermost electron shell of an atom which indicates the lowest energy state of an electron. It cannot be a negative value.
Thus the correct option is B.
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empirical formula for H2Cl2O6
Answer:
HClO₃
Explanation:
Empirical formula of a chemical compound is defined as the simplest ratio of atoms presents in the compound (In whole numbers).
For the H₂Cl₂O₆ the empirical formula could be obtained dividing in 2 the formula. That is:
HClO₃ → This is the simplest ratio of atoms presents in the compound, that is, the empirical formula
A velocity vs time graph is a graph that shows the relationship between the velocity of an object over time___is plotted on the x-axis in seconds, and the___of the object is plotted on the y-axis in meters per second.
Answer:
i have the same question
Explanation:
The following reaction was performed in a sealed vessel at 734 ∘C : H2(g)+I2(g)⇌2HI(g) Initially, only H2 and I2 were present at concentrations of [H2]=3.75M and [I2]=2.15M . The equilibrium concentration of I2 is 0.0800 M . What is the equilibrium constant, Kc, for the reaction at this temperature? Express your answer numerically.
Answer:
128
Explanation:
Step 1: Write the balanced equation
H₂(g) + I₂(g) ⇌ 2 HI(g)
Step 2: Make an ICE chart
H₂(g) + I₂(g) ⇌ 2 HI(g)
I 3.75 2.15 0
C -x -x +2x
E 3.75-x 2.15-x 2x
Step 3: Find the value of x
Since the concentration of I₂ at equilibrium is 0.0800 M,
2.15M-x = 0.0800 M
x = 2.07 M
Step 4: Calculate the concentrations at equilibrium
[H₂] = 3.75-x = 3.75-2.07 = 1.68 M
[I₂] = 0.0800 M
[HI] = 2x = 2(2.07) = 4.14 M
Step 5: Calculate the equilibrium constant Kc
[tex]Kc= \frac{[HI]^{2} }{[H_2]\times [I_2]} = \frac{4.14^{2} }{1.68\times 0.0800} = 128[/tex]
Please help me with this!: Beverages such as pop and fizzy water are carbonated by dissolved CO2. Explain in detail why pop will go flat faster if the cap is left off a bottle compared to if the cap remains tightly in place. You May use diagrams if you wish.
Answer:
If the cap is left off, some of the dissolved CO2 can escape as gas from the bottle, making the pop go flat faster (less dissolved CO2 in pop). If the cap is placed tightly, the gaseous CO2 cannot readily escape the bottle thus your pop won't go flat
Explanation:
If the cap is left off, some of the dissolved CO2 can escape as gas from the bottle, making the pop go flat faster. If the cap is placed tightly, the gaseous CO2 cannot readily escape the bottle thus your pop won't go flat.
Just some fun related concept:
A similar concept comes into play for the reason behind why pop tastes better in fridge then just keeping at normal temperature. This is because gases tend to have high solubility at cold temperatures thus CO2 is more readily dissolved in fridge than outside room temperature which is why it tastes great!
How many atoms are in a sample of 1.83 moles of potassium (K) atoms? How many atoms are in a sample of 1.83 moles of potassium (K) atoms?
Answer:
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles.
1.83 moles K (6.022 x 10^23 atoms / mole ) = 1.10 x 10^24 atoms K
Explanation:
1.83 moles K (6.022 x 10^23 atoms / mole ) = 1.10 x 10^24 atoms
In a compound with molecular formula X2Y3, the valencies of Y and X are
Answer: In a compound with molecular formula [tex]X_2Y_3[/tex] ,the valency of Y and X are 2 and 3 respectively.
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
The given compound is [tex]X_2Y_3[/tex] where X and Y combine and their oxidation states or valencies are exchanged and written in simplest whole number ratios. Thus the oxidation state or valency of X is 3 and that of Y is 2.
The valency of X is 3 and the valency of Y is 2.
The valency is more simply defined as the combining power of an element. We can see the valency of an element from the subscript of the other atom in the compound. This will now serve as our guide in decoding the valencies of X and Y.
Valency of X - 3Valency of Y - 2Hence, the valency of X is 3 and the valency of Y is 2.
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Just need to know the one with the Hexagon
Answer:2,4-dichlorohexane
Explanation:
Hope it helps
0.260 mol of octane is allowed to react with 0.760 mol of oxygen. How many moles of water are produced in this reaction? After the reaction, how much octane is left? Please, use conversion factors if possible.
Answer:
0.5472 moles of H₂O are produced
0.1992 moles of C₈H₁₈ were left
Explanation:
The reaction of octane (C₈H₁₈) with oxygen (O₂) is:
C₈H₁₈ + 25/2 O₂ → 8CO₂ + 9H₂O
Where 1 mole of octane reacts with 25/2 moles of oxygen to produce 8 moles of carbon dioxide and 9 moles of water
For a complete reaction of 0.760moles of oxygen there are needed:
0.760 mol O₂ ₓ (1 mole C₈H₁₈ / 25/2 moles O₂) = 0.0608 moles of C₈H₁₈
As you have 0.260 moles, the moles of octane that were left are:
0.260 mol - 0.0608 mol = 0.1992 moles of C₈H₁₈
Now, if 0.760 moles of O₂ react, the moles of water that are produced are:
0.760 mol O₂ ₓ (9 moles H₂O / 25/2 moles O₂) = 0.5472 moles of H₂O
NF3 Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. +- CHONSPFBrClIXMore Request Answer Part B HBr Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. +- CHONSPFBrClIXMore Request Answer Part C SBr2 Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. +- CHONSPFBrClIXMore Request Answer Part D CCl4 Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. +- CHONSPFBrClIXMore Request Answer Provide Feedback
Here is the correct question.
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
NF3
SBr2
CCl4
Answer:
Explanation:
The objective here is to draw the molecule three molecules by placing atoms on the grids and connecting them with their respective bonds, therefore including all the lone pairs of electrons.
See the attachment below for the diagrams.
The first compound is know as Nitrogentrifluoride. A non-flammable greenhouse gas. It is majorly used for he production of semi conductors. It has a trigonal planar structure.
SBr2: Sulfur dibromide is a yellowish liquid toxic gas. It results as a reaction between SCl_2 and HBr. Its has a Bent Structure.
CCl_4 : carbon tetrachloride has the presence of a colourless liquid with a sweet smell. Carbon tetrachloride is used for different domestic uses such as: cleaning surfaces, fumigating, cleaning metals etc. It has a tetrahedral structure.
explain which of benzene or naphthalene molecule would have equivalent carbon-carbon bond length
Answer:
Lengths. of. Naphthalene. Figure 3.20 shows that there are two equivalent ... all the carbon–carbon bonds of benzene are identical and are intermediate in length ... A typical carbon–carbon single bond has a length of 1.54 Å, and a double ... of how resonance can be used to explain or predict experimental observations.Explanation:
The q,ß-unsaturated ketone A exchanges hydrogen atoms with deuterium at the two positions shown below to give product B. Provide a detailed, stepwise mechanism for the following transformation using proton transfer reactions.
Use curved arrows to show the movement of electrons.
O+D --------> D20 (solvent) D D
Complete Question
The complete question is shown on the first uploaded image
Answer:
The step wise mechanism is shown on the second uploaded image
Explanation:
How many atoms of carbon are in 4.00 moles of C6H12O6?
Answer:
Explanation:
1 mole atoms - 6,02 * [tex]10^{23}[/tex]
4 moles atoms - x
x = 4 * 6,02 * [tex]10^{23}[/tex] * 6
x = 24 * 6,02 * [tex]10^{23}[/tex]
x = 144,48 atoms ≅ 144 atoms
Solution C is a 1.00 L buffer solution that is 1.420 M in acetic acid and 0.67 M in sodium acetate. Acetic acid has a pKa of 4.74. What is the pH change of this solution upon addition of 0.10100 mol of HCl? Enter a negative number to 3 decimal places.
Answer:
The correct answer is 0.10.
Explanation:
Based on the given question, in a buffer solution of 1 liter, the molarity of acetic acid is 1.420 M and the molarity of sodium acetate is 0.67. The pKa value of acetic acid given is 4.74, now the pH of buffer is,
pH of buffer = pKa + log ([CH3COONa]/[CH3COOH])
= 4.74 + log (0.67/1.420)
= 4.74 + (-0.326)
= 4.41
Now 0.10100 mol of HCl is added, the HCl reacts with sodium acetate to give,
CH3COONa + HCl = CH3COOH + NaCl
Now the concentration of CH3COONa becomes = 0.67-0.101 = 0.57 M, and the new concentration of CH3COOH becomes = 1.420 + 0.101 = 1.52 M
Now the new pH will be,
= pKa + log (0.57/1.52)
= 4.74 + (-0.426)
= 4.31
The pH change is 4.41-4.31 = 0.10
What type of reaction would come from reactants Cu and O
Answer:
Synthesis
Explanation:
Because the reactants aren't compounds, it has to be a synthesis reaction, in which Cu and O combine to make copper oxide.
Answer:
Synthesis
Explanation:
d
The density of magnesium is 1.7 g/cm3, and the density of iron is 7.9 g/cm3. Consider a block of iron with a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
Answer:
mass of Mg=0.016g
Explanation:
P(Mg)=1.7g/cm³
P(Fe)=7.9g/cm³
m(Fe)=819g
P(Fe)=m(Fe)/v(Fe)
7.9=819/v(Fe)
v(Fe)=0.0096cm³
since v(Mg)=v(Fe)
=0.0096cm³
P(Mg)=m(Mg) /v(Mg)
1.7=m(Mg)/0.0096
m(Mg) = 0.016g
The mass of the Mg block has been found to be 176.24 grams.
The density can be defined as the mass per unit volume. The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The volume of the object will be:
Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]
The density of Mg block = 1.7 g/[tex]\rm cm^3[/tex]
The density of Fe block = 7.9 g/[tex]\rm cm^3[/tex].
Since the volume of both blocks has been the same.
[tex]\rm \dfrac{Mass\;of\;Mg\;block}{Density\;of\;Mg\;block}\;=\;\dfrac{Mass\;of\;Fe\;block}{Density\;of\;Fe\;block}[/tex]
The given mass of Fe block = 819 g.
Substitute the values:
[tex]\rm \dfrac{Mass\;of\;Mg\;block}{1.7\;g/cm^3}\;=\;\dfrac{819\;g}{7.9\;g/cm^3}[/tex]
Mass of Mg block = 176.24 g.
The mass of the Mg block has been found to be 176.24 grams.
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Compound A (C9H12) shows prominent peaks in its mass spectrum at m/z 120 and 91. Compound B (also C9H12) shows prominent peaks at m/z 120 and 105. On vigorous oxidation with chromic acid, both compounds give benzoic acid. From this information, deduce the structures of both compounds.
Answer:
Compound A: Propylbenzene
Compound B: Cumene
Explanation:
On this case, we have two clues:
1) The mass spectrometry info
2) The formation of benzoic acid
If we have the formation of benzoic acid with a strong oxidant ([tex]H_2CrO_4[/tex]). It means that we have an alky group bonded to benzene. Therefore we have to add three carbons to a benzene ring in order to obtain the mass of the compound (120).
The next question is how these three additional carbons are bonded to the benzene. For this, we have to check the mass info. For compound A we have a fragmentation moeity on 91 therefore we have a loss of an ethyl group. Therefore compound A have a linear structure for the aditional three carbons.
For compound B we have a fragmentation moeity on 105 this means a loss of 15 units of mass therefore we loss a methyl group. This indicates that we have a non linear structure fo the three additional carbons.
See figures 1 and 2.
I hope it helps!
A geochemist in the field takes a 46.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 21·C, and caps the sample carefully. Back in the lab, the geochemist filters the sample and then evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 0.87 g. yes x10 1
Using only the information above, can you calculate the solubility of X in water at 21.° C?
a. yes
b. no
If you said yes, calculate it.
Be sure your answer has a unit symbol and the right number of significant digits.
Answer:
The correct answer is 1.89130 × 10⁻² g per ml.
Explanation:
Based on the given information, the volume of the water sample is 46 ml, the temperature given is 21 degree C. Weight of the compound mineral X is 0.87 grams obtained post evaporating, washing, and drying of the sample. Yes, on the basis of the given information, one can find the solubility of compound X in water at 21 degree C.
As 46 ml of water comprise 0.87 grams of the mineral compound X. Therefore, 1 ml of the water sample will comprise,
= 0.87/46 g of X
= 1.89130 × 10⁻² grams
Hence, the solubility of the compound X in the sample of water is 1.89130 × 10⁻² gram per ml.
How is charge balanced in an oxidation-reduction reaction?
Answer:
Charge is balanced in oxidation half-reactions by adding electrons as products; in reduction half-reactions, charge is balanced by adding electrons as reactants.
Hope it helps :] !!!!!!!!!
According to one acid base theory a base is an 1, h2 acceptor 2, h2 donor 3, h+ acceptor 4,h+ donor
Answer:
3, H⁺ acceptor
Explanation:
Let's consider Bronsted-Lowry acid-base theory.
According to this theory, an acid is a substance that donates H⁺ ions. For example, HCl is an acid.
HCl + H₂O = Cl⁻ + H₃O⁺
Cl⁻ is the conjugate base of HCl.
According to this theory, a base is a substance that accepts H⁺ ions. For example, NH₃ is a base.
NH₃ + H₂O = NH₄⁺ + OH⁻
NH₄⁺ is the conjugate acid of NH₃.
According to one acid-base theory, a base is an H+ acceptor.
What is the acid-base theory?The acid-base theory, also called the Brønsted-Lowry theory, is a theory developed by Johannes N. Brønsted and Thomas M. Lowry.
The acid-base theory states that an acid is a proton (H+) donor, whereas a base can be considered as an H+ acceptor.According to Brønsted-Lowry's theory, H2O may act as a base because this molecule acts as a proton (H+) acceptor.In conclusion, according to one acid-base theory, a base is an H+ acceptor.
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What is the solution to the problem expressed to he correct number of significant figures? 12.0/7.11
Answer: The solution to the problem expressed to he correct number of significant figures is 1.69
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
The rule applied for multiplication and division is :
The least precise number determines the number of significant figures in the answer.
As 12.0 has 3 significant digits and 7.11 also has 3 significant digits, the answer would also contain 3 significant digits.
For [tex]\frac{12.0}{7.11}=1.69[/tex]
Thus the solution to the problem expressed to he correct number of significant figures is 1.69
Answer:
1.69
Explanation:
12.0 ÷ 7.11 = 1.687
The rule of significant figures for division is that the quotient must have the same number of significant figures as the number that has the fewest significant figures.
Both 12.0 and 7.11 have three significant figures. Because of this, we know that we must round our quotient to three significant figures as well. 1.687 rounded to the nearest tenth is 1.69. So our answer is 1.69.
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You have a 100 ml stock solution of 100 mg/ml ampicillin in deionized water. You want to make 30 ml of 25 mg/ml ampicillin in deionized water. How much ampicillin stock and how much deionized water are needed to make this
Answer:
The amount of ampicillin stock is [tex]V_3 = 7.5 mL[/tex]
The amount of deionized is 22.5 \ mL
Explanation:
From the question we are told that
The volume of stock solution of ampicillin in de-ionized water is [tex]V_0 = 100 mL[/tex]
The concentration (in mg ) of ampicillin in de-ionized is [tex]C_0 = 100 mg/mL[/tex]
The volume of ampicillin in deionized water to produce is [tex]V_2 = 30ml[/tex]
The concentration (in mg ) of ampicillin in de-ionized water to produce is [tex]C_2 = 25 mg/mL[/tex]
The chemical process can be mathematically represented as
[tex]V_3 100 = 30 * 25[/tex]
=> [tex]V_3 = \frac{30*25}{100}[/tex]
[tex]V_3 = 7.5 mL[/tex]
The amount of ampicillin stock is [tex]V_3 = 7.5 mL[/tex] and amount of 25 mL (30 - 7.5 = 22.5 mL ) of deionized water
How many grams of lead (ll) sulfate would be produced from the complete reaction of 23.6 g lead (iV) oxide ?
Answer:
59.8287
Explanation:
I put that answer in and it is correct.
Give the characteristics of a strong acid.
a.ionizes completely in aqueous solutions
b.has equilibrium far to the right
c.has a polar bond
d.has a weaker bond to hydrogen
e.all of the above
The characteristics of a strong acid is that it has a weaker bond to hydrogen. That is option D.
What is a strong acid?A strong acid is defined as the type of acid that completely dissociates in an aqueous solution during a chemical reaction.
Typical examples of strong acid include the following:
Hydrobromic Acid (HBr) Hydroiodic Acid (HI) Sulphuric Acid (H2SO4) Nitric Acid (HNO3) Perchloric Acid (HClO4).The characteristics of strong acids over weak acids is that they bond weakly with hydrogens.
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Give TWO reasons, in terms of shielding, why potassium is the
most reactive of the three elements.
Answer:
Hi..? All three elements are in group 1 thus they have 1 valence electron which is easy to lose due to shielding.As Pottasium is larger than the rest,Pottasium's valence electron is at a greater distance from the attractive nucleus and is so removed more easily than Sodium's and Lithium's valence electrons.As it is removed more easily it requires less energy and can be said to be more reactive
over
In order for an object to be buoyant, there must be a difference in
the area of the object.
A. force of gravity
B. density
C. fluid pressure
D. mass
Answer:
fluid pressure
Explanation:
a p e x
You put scruffy can run up to 2 meters/sec on his fastest days scruffy has a mass of 8 KG what is his maximum kinetic energy on his fastest days?
Answer:
E = 16 J
Explanation:
We have,
You put scruffy can run up to 2 m/s on his fastest days scruffy has a mass of 8 kg
It is required to find the maximum kinetic energy on his fastest days. If v is the velocity, then kinetic energy is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
Plugging all the values,
[tex]E=\dfrac{1}{2}\times 8\times 2^2 \\\\E=16\ J[/tex]
So, the maximum kinetic energy on his fastest day is 16 J.
Which option correctly explains a metallic bond
Answer:
The chemical bond between atoms in metallic elements
Explanation:
Metallic bond is a bond that exist between metallic elements. It does not occur between metals and non metals.
How many grams of NO are required to produce 145 g of N2 in the following reaction?
4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)
a. 155 g
b. 186 g
c. 125 g
d. 145 g
e. 129 g
Answer:
b. 186 g
Explanation:
Step 1: Write the balanced equation.
4 NH₃(g) + 6 NO(g) → 5 N₂(g) + 6 H₂O(l)
Step 2: Calculate the moles corresponding to 145 g of N₂
The molar mass of nitrogen is 28.01 g/mol.
[tex]145g \times \frac{1mol}{28.01 g} =5.18 mol[/tex]
Step 3: Calculate the moles of NO required to produce 5.18 moles of N₂
The molar ratio of NO to N₂ is 6:5.
[tex]5.18molN_2 \times \frac{6molNO}{5molN_2} = 6.22molNO[/tex]
Step 4: Calculate the mass corresponding to 6.22 moles of NO
The molar mass of NO is 30.01 g/mol.
[tex]6.22mol \times \frac{30.01g}{mol} =186 g[/tex]
The mass of NO required to produce 145 g of N₂ is 186 g.
The correct answer to the question is Option B. 186 g
We'll begin by calculating the mass of NO that reacted and the mass of N₂ produced from the balanced equation.
4NH₃ + 6NO —> 5N₂ + 6H₂O
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 6 × 30 = 180 g
Molar mass of N₂ = 14 × 2 = 28 g/mol
Mass of N₂ from the balanced equation = 5 × 28 = 140 g
From the balanced equation above,
140 g of N₂ were produce by 180 g of NO
Finally, we shall determine the mass of NO required to produce 145 g of N₂
From the balanced equation above,
140 g of N₂ were produce by 180 g of NO
Therefore,
145 g of N₂ will be produce by = (145 × 180) / 140 = 186 g of NO
Thus, 186 g of NO is required for the reaction.
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Wich substances is most likely to form in a precipitation reaction?
Answer:
A precipitation reaction refers to the formation of an insoluble salt when two solutions containing soluble salts are combined. The insoluble salt that falls out of solution is known as the precipitate, hence the reaction's name.
Explanation: