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