CHEM 1151 FINAL EXAM STUDY
In a solution, the solvent
can be a solid, liquid, or gas
Water, H2O, is an example of a(n)
chemical
Which of the following setups would convert centimeters to feet?
cm * 1in/2.45cm * 1 ft/12 in
In a ______ reaction, two or more elements or compounds form one product
combination
The energy associated with the motion of particles in a substance is called
heat
0.50 mole of KCl is added to 2.0 kg of water. The boiling point of the solution will be _____the boiling a pure water
higher than
If the reaction shown below is exothermic, the energy level of the reactants is H2 + O2 --> 2H2O
higher than that of the products
Air is a
homogeneous mixture
In the number 12.345, the 4 is in the ____ place
hundredths place
According to Henry's law, the solubility of a gas in a liquid
increases as the gas pressure above the liquid increases
An increase in the temperature of a solution usually
increases the solubility of a gas in the solution
A solution with the same osmotic pressure as the blood is
isotonic to the blood
The metric unit for volume is the
liter
In which of the following is the metric unit paired with its correct abbreviation?
milliliter/mL
The molarity (M) of a solution refers to
moles of solute/L of solution
A driver is traveling at 60km/h. Is the driver speeding if the speed limit is 45 mph?
no
You notice that there is more traffic between 8 and 9 in the morning. This would be a
observation
Oil does not dissolve in water because
oil is nonpolar
The O-H bond in water is polar because
oxygen is much more electronegative than hydrogen
The energy stored in the chemical bonds of a carbohydrate molecule is
potential energy
An example of kinetic energy is
running water
When some of the sugar added to iced tea remains undissolved at the bottom of the glass, the solution is
saturated
A solution is prepared by dissolving 2 g of KCl in 100 g of H2O. In this solution, H2O is the
solvent
In the process known as osmosis, ____ moves through a semipermeable membrane into an area of ___ concentration
solvent; lower solvent
In which of the following would the particles move most rapidly?
steam 110 degrees C
An equivalent is
the amount of ion that carries 1 mole of electrical charge
During the process of diluting a solution to a lower concentration,
the amount of solute does not change
A heating curve illustrates
the changes in the temperature and physical state of a substance as it is heated
Significant figures are important because they indicate
the precision of a measurement
In an exothermic reaction, heat is a product
true
Loss of electrons is an oxidation
true
A value of 36 mL is a measure of
volume
In order to enhance your learning in chemistry, you should not
wait until the night before the exam to study
Which of the following is an example of potential energy
water stored in a reservoir
The researcher added three samples of sodium chloride solution; the volume were: 0.351 mL, 0.350 mL and 0.349 mL. The total volume should be reported as
1.050 mL
A liquid has a volume of 34.6 mL and a mass of 46.0 g. What is the density of the liquid?
1.33 g/mL
The dietary calorie (Cal) is equal to
1000 calories
What is the molarity of a solution that contains 3.25 moles of NaNO3 in 250 mL of solution?
13.0 M
3.00 moles of NO2 have a mass of
138 g
How many centimeter are there in 57.0 in?
145 cm
How many equivalents are present in 5.0 moles of Al3+?
15 Eq
What is the molar mass of copper (II) sulfate, CuSO4?
159.6 g
For the equation 4x + 2 = 10, x equals
2
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of F32O3 produced? 4Fe(s) + 3O2 (g) --> 2Fe2O3 (s)
2 moles of Fe2O3/3 moles of O2
What is the molarity of a solution that contains 17 g of NH3 in 0.50 L of solution?
2.0 M
What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL?
2.30 kg
What is the molarity of a solution containing 5 moles of KCl in a 2.0 L of solution?
2.5 M
A doctor's order is 0.125 g of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliter of the suspension are required?
2.5 mL
How many water molecules of water, H2O are present in 75.0 g of H2O?
2.51 * 10^24
If the temperature is -55 C, what is the corresponding temperature on the Kelvin scale?
218 K
Which of the following conversion factors is a measured number?
25 miles/gallon
What is the concentration, in mass percent, of a solution prepared from 50.0 g NaCl and 150.0 g of water?
25.0%
When 2610 + 11.7 + 0.22 are added, the answer to the correct decimal places is
2620
For the reaction: 2H2O(l) + 137 kcal --> 2H2 (g) + O2 (g), how many kcal are needed to form 2.00 moles O2 (g)?
274 kcal
Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 --> Ca3(PO4)2 + KNO3
2K3PO4 + 3Ca(NO3)2 --> Ca3(PO4)2 + 6KNO3
How many milliliters of a 25% (m/v) NaOH solution would contain 75g of NaOH?
3.0 * 10^2 mL
Writeen in scientific notation, 0.000 000 33 is
3.3 * 10^-7
Rubbing alcohol is 70% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL container)?
330 mL
How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 degrees C to 35 degrees C? Iron has a specific heat of 0.108 cal/g C
38 cal
The molar mass of potassium is
39.1 g
A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported?
424
The number of significant figures in the measurement of 45.030 mm is
5
Written in the scientific notation, 540 000 is
5.4 * 10^5
A 2.5 g sample of french fries is placed in a calorimeter with 500.0 g of water at an initial temperature of 21 degrees C. After combustion of the french fries, the water has a temperature of 48 degrees C. What is the caloric value of the french fries?
5.4 kcal/g
One mole of particles of any substance contains how many particles?
6.02 * 10^23
If the temperature is 20 degrees celsius, what is the corresponding temperature on the Fahrenheit scale?
68 degrees F
What coefficient if placed in front of O2 to complete the balancing of the following equation? C5H8 +? O2 --> 5CO2 + 4H2O
7
How many atoms of neon are present in 1.30 moles of neon?
7.83 * 10^23
How many grams of glucose are needed to prepare 400 mL of a 2.0% (m/v) glucose solution?
8.0 g
A potato contains 20 g of carbohydrate. If the carbohydrate has a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the potato?
80 kal
In water, a substance that ionizes completely in solution is called a
a strong electrolyte
A hydrogen bond is
an attraction between a hydrogen atom attached to N, O, or F and an N, O, or F atom on another molecule
What type of reaction is: CH4 + 2O2 --> CO2 + 2H2o + 218 kcal?
an exothermic reaction
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?
balsa wood (density = 0.16 g/mL)
Which of the following is a chemical change?
burning sugar
How many moles of carbon atoms are there in 0.500 moles of C2H6?
1.00 moles
A 50.0 mL urine sample has a mass of 50.7 g. The specific gravity of the urine is
1.01
Which of the following correctly gives the best coefficients for the reaction below? N2H4 + H2O2 --> N2 + H2)
1,2,1,4
The product (-4) * (-5) is
+20
0.50 mole of NaCl is added to 1.0 kg of water. The freezing point of the solution will be
-0.93 / -1.86 degrees celsius
5.21 cm is the same distance as
0.0521 m
What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100 mL?
0.150 M
What is the correct answer for the calculation of a volume (in mL) with measured numbers 28.58/16 * 8.02?
0.22 mL
2Mg + O2 --> 2MgO The number of moles of MgO produced when o.20 mole of O2 reacts completely is
0.40 mole
Which of the following measurements has three significant figures?
0.510 m
What is the metric relationship between grams and micrograms?
1 g = 1000 000 micrograms
Which of the following is an oxidation-reduction reaction?
N2 + O2 --> 2NO
A homogenous mixture that does not settle out upon standing is
a colloid
A chemical equation is balanced when
a number of atoms of each element is the same in reactants and products
The following reaction takes place when an electric current is passed through water. It is an example of a ____ reaction 2H2O --> 2H2 + O2
decomposition
The ratio of the mass of a substance to its volume is its
density
Helium is a(n)
element
In an endothermic reaction
energy is absorbed by the system
The % yield is the ratio of the theoretical yield to the actual yield multiplied by 100
false
The following reaction is balanced KClO3 --> KCl +O2
false
The molar mass of chlorine gas is 35.5 g
false
The molar mass of silver is 47.00 g
false
The mass percent concentration refers to
grams of solute in 100g of solution
The mass/volume percent concentration refers to
grams of solute in 100mL of solution
Which of the following is a physical property of both liquids and gases?
has randomly arranged particles