Question 1

Which of the following measurements is reported with the correct number of significant digits if a student measures a volume as 25.30 mL using a graduated cylinder with 0.01 mL increments?

Accepted Answer

25.30 mL

Question 2

A student records the mass of a rock as 12.45 g and its volume as 3.2 mL. What is the density of the rock, reported with the correct number of significant digits?

Accepted Answer

$$4.0 \ 	ext{g/mL}$$

Question 3

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not evenly distributed and can be distinguished

Question 4

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

Accepted Answer

Burning of wood

Question 5

A sample of water is heated from $$20^\circ 	ext{C} to$$ $$80^\circ 	ext{C}. If $$the mass of water is $$100 \ 	ext{g}$$ and the specific heat capacity is $$4.18 \ 	ext{J/g}^\circ 	ext{C}$$, how much heat ($$q) is $$absorbed?

Accepted Answer

$$25,080 \ 	ext{J}$$

Question 6

Which of the following statements best illustrates the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 7

Convert $$0.00345$$ kilometers to centimeters using metric prefixes.

Accepted Answer

$$345 \ 	ext{cm}$$

Question 8

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 9

A student needs to solve for the final temperature ($$T) in $$the specific heat equation $$q = mc\Delta T. If$$ $$q = 500 \ 	ext{J}$$, $$m = 50 \ 	ext{g}$$, $$c = 2.0 \ 	ext{J/g}^\circ 	ext{C}$$, and the initial temperature is $$10^\circ 	ext{C}$$, what is the final temperature?

Accepted Answer

$$15^\circ 	ext{C}$$

Question 10

Which of the following best describes an element?

Accepted Answer

A substance that cannot be broken down into simpler substances by chemical means

Question 11

A student adds $$2.00 \ 	ext{g} of $$sodium chloride to $$100.0 \ 	ext{g} of $$water. What is the total mass of the solution after the salt dissolves, according to the Law of Conservation of Mass?

Accepted Answer

$$102.0 \ 	ext{g}$$

Question 12

Which of the following is the correct scientific notation for the number $$0.000567$$?

Accepted Answer

$$5.67 \times 10$$^{-4}$$

Question 13

Which of the following changes is an example of an endothermic process?

Accepted Answer

Melting ice to form liquid water

Question 14

A beaker contains a mixture of sand, salt, and water. Which of the following best describes this mixture?

Accepted Answer

A heterogeneous mixture

Question 15

Which of the following is the correct formula to calculate the density ($$d) of a $$substance?

Accepted Answer

$$d = \frac{m}{V}$$

Question 16

A student measures the temperature of boiling water as $$99.8^\circ 	ext{C}. $$What is this temperature in Fahrenheit? (Use $$F = \frac{9}{5}C + 32)$$

Accepted Answer

$$211.6^\circ 	ext{F}$$

Question 17

Which of the following best describes specific heat capacity?

Accepted Answer

The amount of heat required to raise the temperature of 1 gram of a substance by $$1^\circ 	ext{C}$$

Question 18

Which of the following is a physical property of a substance?

Accepted Answer

Boiling point

Question 19

A student mixes $$50.0 \ 	ext{g} of $$water at $$20.0^\circ 	ext{C}$$ with $$50.0 \ 	ext{g} of $$water at $$80.0^\circ 	ext{C}. $$Assuming no heat is lost to the surroundings, what is the final temperature of the mixture?

Accepted Answer

$$50.0^\circ 	ext{C}$$

Question 20

Which of the following is the correct number of significant digits in the measurement $$0.00450$$?

Accepted Answer

3

Introduction to Chemistry: Foundational Concepts and Measurement

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