Question 1

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 2

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more different elements chemically combined in a fixed ratio

Question 3

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

Accepted Answer

Flammability

Question 4

A student measures the mass of a sample three times and gets values very close to each other, but far from the true value. This is an example of:

Accepted Answer

Low accuracy and high precision

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

How many significant figures are in the measurement $$0.0200 g$$?

Accepted Answer

3

Question 7

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 8

Which SI base unit is used to measure the amount of substance?

Accepted Answer

Mole

Question 9

A sample of water is heated from $$25^\circ \mathrm{C} to$$ $$100^\circ \mathrm{C}. $$Which type of change is this?

Accepted Answer

Physical change

Question 10

Which of the following correctly expresses $$0.00056 in $$scientific notation with the correct number of significant figures?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 11

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements are arranged in order of increasing atomic number

Question 12

A student adds $$12.11 g $$and $$0.034 g. $$What is the correct answer, using the rules for significant figures?

Accepted Answer

$$12.14 g$$

Question 13

Which of the following is a polyatomic element?

Accepted Answer

S$$_8$$

Question 14

Which of the following is a chemical change?

Accepted Answer

Iron rusting

Question 15

Which prefix represents $$10^{-9} in $$the SI system?

Accepted Answer

Nano-

Question 16

A sample of seawater is filtered to remove sand, then evaporated to recover salt. Which statement is true?

Accepted Answer

Seawater is a heterogeneous mixture

Question 17

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

Accepted Answer

Kelvin

Question 18

Which of the following best describes the difference between an atom and a molecule?

Accepted Answer

A molecule consists of two or more atoms bonded together

Question 19

A student multiplies $$2.50 (3 $$sig figs) by $$0.040 (2 $$sig figs). What is the correct answer, using the rules for significant figures?

Accepted Answer

$$0.10$$

Question 20

Which of the following is a real-world example of a physical change?

Accepted Answer

Evaporation of sweat from skin

General Chemistry: Core Concepts and Foundations

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