CHEM 1045L Miami Dade College Chemistry Lab Questions It’s an maultiple choice examen with four exercises at the bottom,I’ll attach the test bellow for the

CHEM 1045L Miami Dade College Chemistry Lab Questions It’s an maultiple choice examen with four exercises at the bottom,I’ll attach the test bellow for the tutor to complete it in the same format and sent back to me before the deadline Take Home Chemistry Test Spring 2020
Match each item on left column to a letter on the right column:
1) melting point
A) the temperature at which a solid turns into a liquid
2) boiling point
B) the term for a change in the physical state of a substance
3) phase change
C) the conversion of a liquid to a gas below the boiling point
4) evaporation
D) the vaporization of an uncontained liquid
5) vaporization
E) the temperature at which the vapor pressure of a liquid is just equal to the external pressure
6) heat of formation
E) the energy change involved in a chemical reaction
7) heat of fusion
F) the energy involved in dissolving a solid
8) heat of solution
G) the energy required to melt a solid at its melting point
9) Heat of reaction
H) the energy involved in the creation of a compound from its elements
10) aqueous solution
I) dissolving medium
11) solvent
J) compound that will conduct current in the liquid state or in aqueous solution
12) electrolyte
K) dissolved particle
13) solute
L) homogeneous mixture of water and dissolved substances
14) neutralization
M) procedure used to determine the concentration of an acid or base
15) titration
N) reaction in which an acid and a base produce a salt and water
16) hydrogen-ion donor
O) Bronsted-Lowry acid
17) hydrogen-ion acceptor
P) Bronsted-Lowry base
18) amphoteric
Q) able to act as both an acid and a base
19) basic
R) base that has gained a proton
20) conjugate acid
S) hydrogen ion concentration is less than 10-7M
21) boiling point elevation
T) depends on the number of particles a solute yields in solution
22) colligative property
U) number of moles of solute dissolved in 1 L of solution
23) molarity
V) a colligative property related to the fact that ice will form at higher
temperatures in the Great Lakes than in the ocean
24) freezing point depression
X) a colligative property related to a decrease in the vapor pressure of a solution
25) saturated solution
temperature
Y) solution containing more solute than can theoretically dissolve at a given
26) supersaturated solution
Z) measure of the amount of solute dissolved in a specified quantity of solvent
27) concentration
AA) solution containing a small amount of solute
28) dilute solution
BB) solution containing less than the maximum amount of dissolved solute
29) unsaturated solution
CC) solution containing a large amount of solute
30) concentrated solution
DD) solution containing maximum amount of solute
Multiple Choice: Select the correct answer
1) As the temperature of a sample of matter is increased, what happens to the average kinetic energy of the particles in the
sample?
A) It decreases. B) It does not change. C) It increases.
2) The condensation of steam is a(n) _____.
A) exothermic process B) endothermic process C) catalytic process D) electrolytic process
3) When 45 g of an alloy is dropped into 100.0 g of water at 25?C, the final temperature is 37°C. What is the specific heat of
the alloy?
A) 1.77 B) 0.423 C) 48.8 D) 9.88
4) When cooking food with natural gas, the energy comes from _____.
A) kinetic energy in the gas B) the pressure of the gas C) chemical potential energy of the gas molecules D) the volume of the
gas
5) The energy produced by burning gasoline in a car engine _____.
A) is transformed into work to move the car B) is lost as heat in the exhaust C) heats the parts of the engine D) all of the
above
6)A process that absorbs heat is a(n) _____ process.
A) ectothermic B) exothermic C) polythermic D) endothermic
7) What does the symbol “?H” stand for?
A) the specific heat of a substance B) one Calorie given off by a reaction C) the heat capacity of a substance D) the heat of
reaction for a chemical reaction
8) The following equation shows the reaction that occurs when nitroglycerine explodes. 4C3H5O9N3 ¬ 12CO2 + 6N2 + O2 +
10H2O + 1725 kcal This reaction is _____.
A) a combination reaction B) a combustion reaction C) exothermic D) endothermic
9) During a phase change, the temperature of a substance _____.
A) increases B) remains constant C) decreases D) may increase or decrease
10) When heat is added to boiling water, its temperature _____.
A) decreases B) depends on the amount of water C) stays the same D) increases
11) Why does the pressure inside a container of gas increase if more gas is added to the container?
A) because there is a corresponding increase in the force of the collisions between the particles and the walls of the
container
B) because there is a corresponding increase in the number of particles striking an area of the wall of the container per unit
time
C) because there is a corresponding decrease in volume
D) because there is a corresponding increase in the temperature
12) Why does air leave a tire when the tire valve is opened?
A) because the pressure outside the tire is lower than the pressure inside the tire
B) because the temperature is higher outside the tire than inside the tire
C) because the pressure outside the tire is greater than the pressure inside the tire
D) because there are more gas particles outside the tire than inside the tire
13) If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change within the
container?
A) The pressure will be five times as great.
B) The pressure will be four times as great.
C) The pressure will be twice as great.
D) The pressure will not change.
14) What happens to the pressure of a gas inside a container if the temperature of the gas is lowered?
A) The pressure does not change.
B) The pressure increases.
C) The pressure decreases.
15) The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas pressure
change?
A) increases by a factor of eight
B) decreases by a factor of eight
C) increases by a factor of two
D) increases by a factor of four
16) How does the surface tension of water compare with the surface tensions of most other liquids?
A) It is lower. B) It is higher. C) It is about the same.
17) Which of the following is primarily responsible for holding water molecules together in the liquid state?
A) hydrogen bonds B) polar covalent bonds C) dispersion forces D) ionic bonds
18) Which atom in a water molecule has the greatest electronegativity?
A) one of the hydrogen atoms B) the oxygen atom C) both hydrogen atoms D) There is no difference in the
electronegativities of the atoms in a water molecule.
19) The bonds between the hydrogen and oxygen atoms in a water molecule are _____.
A) hydrogen bonds B) polar covalent bonds C) nonpolar covalent bonds D) ionic bonds
20) The bonds between adjacent water molecules are called _____.
A) nonpolar covalent bonds B) hydrogen bonds C) ionic bonds D) polar covalent bonds
21) How does the boiling point of water compare with the boiling points of other molecules of similar size?
A) It is about the same. B) It is lower. C) It is higher.
22) Holding the temperature constant while adding more solute to a solution that already has solute crystals at the bottom
of the container _____.
A) causes the solution to become supersaturated B) makes the solution more concentrated C) causes more solute crystals
to appear at the bottom of the container D) none of the above
23) What does not change when a solution is diluted by the addition of solvent?
A) mass of solvent B) number of moles of solute C) volume of solvent D) mass of solution E) molarity of solution
24) When an acid reacts with a base what compounds are formed?
A) metal oxides only B) a salt only C) water only D) a salt and water
25) Which of the following is a property of an acid?
A) slippery feel B) unreactive C) strong color D) sour taste E) nonelectrolyte
26) What is a property of a base?
A) strong color B) unreactive C) watery feel D) nonelectrolyte E) bitter taste
27) If the hydrogen ion concentration is 10-10M, is the solution acidic, basic, or neutral?
A) acidic B) none of the above C) neutral D) basic
28) What products result from a neutralization reaction?
A) polar covalent compounds B) a salt and water C) a salt only D) water only E) acids and bases
29) What is obtained when phosphoric acid and magnesium hydroxide are mixed?
A) water only B) magnesium hydride C) hydrogen gas D) magnesium phosphate plus water E) hydrogen-magnesium alloy
30) Which of the following compounds does not contain a C=O bond?
A) ketones B) aldehydes C) esters D) amides E) ethers
31) When gasoline is burned in an automobile engine, _____.
A) potential energy is transformed into kinetic energy B) energy is created C) heat energy is converted to chemical energy D)
energy is destroyed
Word Problems:
A.
Calcium carbide reacts with water to produce acetylene. How many grams of the water will be consumed to
produce 25 grams of the acetylene? The equation is as follows:
CaC2 (s) + 2H2O (g) ? Ca (OH)2 (s) + C2H2 (g)
B.
Magnesium and nitrogen react in a combination reaction to produce magnesium nitride. In this particular case, a
9.27g sample of N2 reacts completely. Calculate the mass of Mg consumed. The equation is as follows:
3 Mg (s) + N2 (g) ? Mg3N2 (s)
C.
The combustion of propane (C3H8) produces CO2 and H2O. In this reaction, 2.5 mol of O2 were used. How many
moles of water were produced? The equation is as follows:
C3H8 (g) + 5O2 (g) ?3CO2 (g) + 4H2O (g)
D.
What is the maximum amount of aluminum oxide that can be produced from 8.5 g of aluminum and 1.5 g of O2?
E. What is the molecular shape of the following compounds?
a)
H2S
b)
CCl4
c)
NO2-
d)
CH2O

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