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Semester exam part 3
Semester exam part 3
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1
What will happen to the ability of a solid to dissolve in a liquid if the temperature increases?
Solubility of the solid always increases.
Solubility of the solid always decreases.
Solubility of the solid usually decreases.
Solubility of the solid usually increases.
2
A solution that contains the maximum amount of solute that is soluble at a given temperature is said to be —
unsaturated
supersaturated
diluted
saturated
3
In the reaction 2H2 + O2 → 2H2O, what is the mole ratio of hydrogen to water?
4 : 4
2 : 2
1 : 2
2 : 1
4
In the reaction 2H2 + O2 → 2H2O, how many moles of oxygen are required to fully react with 6.0 mol of hydrogen?
12.0 mol
3.0 mol
6.0 mol
18.0 mol
5
What makes water, H2O, a polar molecule?
hydrogen atoms have a greater electron affinity
structure is bent rather than linear.
Its density
It has N and S poles
6
Which substance is the limiting reagent in the chemical reaction?
Substance A
Substance D
Substance B
Substance C
7
According to the kinetic molecular theory, which statement best describes the motion of gas particles?
Gas particles are in continuous, random motion.
Gas particles are only in motion when a gas is heated.
Gas particles move together in the same direction.
Gas particles are stationary.
8
Why is water used as a solvent in many solutions?
dissolves any chemical.
dissolves polar molecules.
dissolves nonpolar molecules.
dissolves other water molecules.
9
Water can dissolve many substances because ―
linear molecular shape
nonpolar molecular structure
molecular formula H2O
partial charge on each side of its molecules
10
A solution in which more solute is dissolved than is typically soluble at a given temperature is —
supersaturated
unsaturated
diluted
saturated
11
Which of the following statements is related to a postulate (assumption) of the kinetic molecular theory of gases?
constant motion, giving them a large amount of potential energy.
constant motion because they are strongly attracted to each other.
constant motion and are very far apart compared to their size.
constant motion so they lose kinetic energy when they collide
12
According to the kinetic molecular theory of gases, the pressure of the gas is due entirely to the ―
size of the gas particles
moles of gas particles
mass of the gas particles
force of the collisions
13
Which type of solution has achieved equilibrium between solute and solvent if the solute is still visible after mixing?
A saturated solution
An unsaturated solution
A supersaturated solution
A dilute solution
14
Why is water sometimes called the “universal solvent?”
Many substances dissolve in H2O.
adhesion level in H2O is very high.
density of H2O is 1.0 g/cm .
hydrogen bonding of H2O is very low.
15
What property of water allows it to transport ions?
Density
Boiling point
Polarity
Surface tension
16
In the reaction 2RbNO3 → 2RbNO2 + O2, how many moles of O2 are produced when 5.0 mol of RbNO3 decompose?
3.0 mol
7.5 mol
2.5 mol
1.0 mol
17
If the temperature of a gas changes but the number of moles and volume remain constant, which would change?
Mass
Density
Pressure
Number of atoms
18
50 mL, 100 mL, 250 mL, and 500 mL. If each of these contains .25 moles. Higher pressure?
50 Ml
250 Ml
500 Ml
100 Ml
19
Any substance that does not conduct electricity when in solution is called a(n) ―
nonelectrolyte
semiconductor
conductor
electrolyte
20
In the reaction N2 + 3H2 → 2NH3, what is the mole ratio of hydrogen to nitrogen?
1 : 1
1 : 2
3 : 2
3 : 1
