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Some questions of general chemistry and chemical equations

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Question 36 Multiple Choice 20 points
Atoms of the same element with different mass numbers are called:
nucleons
neutrons
allotropes
chemical families
isotopes

Question 37 Multiple Choice 20 points
Which is the correct formula for copper(II) phosphate?

Cu2PO4
Cu3(PO4)2
Cu2PO3
Cu(PO4)2
Cu(PO3)2

Question 38 Multiple Choice 20 points
When a chemical equation is balanced, it will have a set of whole number coefficients which cannot be reduced to smaller whole numbers. When the following chemical equation is balanced, what is the sum of the coefficients (do not forget to add in the coefficient one if it occurs)?
___ Al + ___ H2SO4 ___ Al2(SO4)3 + ___ H2

3
5
6
9
12

Question 39 Multiple Choice 20 points
CH3NH2 represents a/an

alcohol
alkyne
amine
ester

Question 40 Multiple Choice 20 points
How many protons and electrons are present in Bromine?

80 protons, 35 electrons
45 protons, 35 electrons
35 protons, 45 electrons
35 protons, 35 electrons

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https://brainmass.com/chemistry/stoichiometry/some-questions-of-general-chemistry-and-chemical-equations-39902

Solution Preview

Questions 36
Those atoms are called: isotopes

Question 37
The correct formula is: Cu3(PO4)2, ...

Solution Summary

The answers are given without detailed explanations. In two cases short hints are given because the question is of general importance and to make it easier to apply the rules on other similar chemical problems.

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General Chemistry

Kc for the reaction below at 25°C is 4.8 x 10-6. Calculate the
equilibrium concentration (mol/L) of Cl2(g) if the initial
concentration of ICl(g) is 1.33 mol/L. There is no I2 or Cl2
initially present.

2ICl(g) <-> I2(g) + Cl2(g)

a. 6.4 x 10-6
b. 343
c. 3.2 x 10-6
d. 2.9 x 10-3
e. 5.8 x 10-3

2. Consider the following reaction at equilibrium:
2NH3(g) <-> N2(g) + 3H2(g) &#916;H° = +92.4 kJ

Adding N2(g) to the system at equilibrium will __________.

a. decrease the concentration of H2(g) at equilibrium
b. remove all of the H2(g)
c. cause the reaction to shift to the right
d. increase the value of the equilibrium constant
e. decrease the concentration of NH3(g) at equilibrium

3. Consider the following reaction at equilibrium:

2CO2(g) <-> 2CO(g) + O2(g) (Traingle sign)H° = 514 kJ
Increasing the temperature will ________.

a. decrease the concentration of CO2(g)
b. shift the reaction to the right
c. increase the concentration of CO
d. increase the concentration of O2(g)
e. decrease the value of the equilibrium constant

3. The effect of a catalyst on a chemical reaction is to
_______________.

a. accelerate the forward reaction only
b. lower the energy of the transition state
c. make reactions more exothermic
d. increase the entropy change associated with a reaction
e. react with product, effectively removing it and shifting the
equilibrium to the right

4. Consider the equilibrium at 25°C:
1A(g) + 2B(g) <-> 3C(g) + D(L) Kc = 3.25 x 10-2
What is the value of Kp?

a. 19.453700
b. 80.521090
c. 0.136915
d. 0.000156
e. 0.032500

5. Consider the equilibrium at 25°C:
2A(g) + 2B(g)<-> 1C(g) + D(L) Kp = 2.65 x 10-4
What is the value of Kc?

a. 4030182.628
b. 3.881
c. 1586.224730
d. 0.002291
e. 2379.556

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