Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as salt water.

Question 2

A nurse prepares 2.00 L of an intravenous glucose solution with a density of $$1.15\ \mathrm{g/mL}. $$What is the mass of the solution in grams?

Accepted Answer

$$2300\ \mathrm{g}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood in a fireplace.

Question 4

Mercury has a specific gravity of $$13.6. $$How many milliliters of mercury have a mass of $$0.35\ \mathrm{kg}$$?

Accepted Answer

$$25.7\ \mathrm{mL}$$

Question 5

A saline solution has a mass of $$24\ \mathrm{g}$$, of which $$2.8\ \mathrm{g} is $$sodium chloride. What percent of the solution is sodium chloride?

Accepted Answer

$$11.7\%$$

Question 6

Which of the following statements about energy is correct?

Accepted Answer

Energy is the ability to do work.

Question 7

A 32.5 g cube of aluminum at $$45.8\ ^\circ\mathrm{C} is $$placed in $$105.3\ \mathrm{g} of $$water at $$15.4\ ^\circ\mathrm{C}. $$What is the final temperature at thermal equilibrium? (Specific heat of Al: $$0.903\ \mathrm{J/g\ ^\circ C}$$, water: $$4.18\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$16.2\ ^\circ\mathrm{C}$$

Question 8

Which of the following is a correct example of a prefix multiplier and its value?

Accepted Answer

kilo-, $$10^3$$

Question 9

A 55.0 g aluminum block initially at $$27.5\ ^\circ\mathrm{C}$$ absorbs $$725\ \mathrm{J} of $$heat. What is its final temperature? (Specific heat of Al: $$0.903\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$41.1\ ^\circ\mathrm{C}$$

Question 10

A collection of coins contains 9 nickels, 6 quarters, and 5 dimes. What is the percentage of dimes in the collection?

Accepted Answer

$$20\%$$

Question 11

Which of the following is NOT a physical change?

Accepted Answer

Rusting of iron.

Question 12

A student finds a gold-colored rock with a mass of $$4.7\ \mathrm{g}. $$Upon absorption of $$57.2\ \mathrm{J} of $$heat, its temperature rises from $$25\ ^\circ\mathrm{C} to$$ $$57\ ^\circ\mathrm{C}. $$What is the specific heat capacity of the rock, and is it consistent with pure gold? (Specific heat of gold: $$0.128\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$0.385\ \mathrm{J/g\ ^\circ C}$$; not consistent with gold

Question 13

Which of the following is the correct SI unit for energy?

Accepted Answer

Joule ($$\mathrm{J})$$

Question 14

What is the specific gravity of a solution with a density of $$1.18\ \mathrm{g/mL}$$?

Accepted Answer

$$1.18$$

Question 15

Which of the following best describes potential energy?

Accepted Answer

Energy stored due to an object's position or composition.

Question 16

An alloy contains $$57\ \mathrm{g} of $$pure silver and $$23\ \mathrm{g} of $$pure copper. What is the percentage of silver in the alloy?

Accepted Answer

$$71\%$$

Question 17

Which of the following is an example of kinetic energy?

Accepted Answer

A rolling ball.

Question 18

Suppose you find a penny (minted before 1982, pure copper, $$3.10\ \mathrm{g}) in $$the snow at $$-8.0\ ^\circ\mathrm{C}$$ and it warms to $$37.0\ ^\circ\mathrm{C}. $$How much heat is absorbed? (Specific heat of copper: $$0.385\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$53.6\ \mathrm{J}$$

Question 19

Which of the following best describes a pure substance?

Accepted Answer

A material with a fixed composition and distinct properties.

Question 20

A clinic had 30 patients on Friday morning. If 24 patients were given flu shots, what percentage of the patients received flu shots?

Accepted Answer

$$80\%$$

GOB Chemistry Exam 2 Study Guide – Step-by-Step Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard