Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt water

Question 2

Which of the following best describes a compound?

Accepted Answer

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

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 4

Which of the following is the correct chemical formula for calcium chloride?

Accepted Answer

$$\mathrm{$$CaCl_2$$}$$

Question 5

A student mixes sand and salt together. Which type of mixture is formed?

Accepted Answer

Heterogeneous mixture

Question 6

Which of the following is NOT a chemical reaction?

Accepted Answer

Boiling water to produce steam

Question 7

Which of the following is a derived SI unit?

Accepted Answer

Newton ($$\mathrm{N})$$

Question 8

If you have $$2.5 	imes 10^3$ milligrams, how many grams do you have?

Accepted Answer

$$2.5$$ grams

Question 9

Which of the following best describes the difference between a mixture and a compound?

Accepted Answer

Mixtures can be separated by physical means, compounds require chemical means

Question 10

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

Accepted Answer

Dissolving salt in water

Question 11

Which of the following is the correct balanced chemical equation for the decomposition of water?

Accepted Answer

$$2\mathrm{H_2O}(l) \rightarrow 2\mathrm{H_2$}(g) + \mathrm{O_2$}(g)$$

Question 12

Which prefix represents $$10^{-6} in $$the metric system?

Accepted Answer

Micro-

Question 13

A sample contains $$3.00 	imes 10^2$ centimeters. How many meters is this?

Accepted Answer

$$0.300$$ meters

Question 14

Which of the following is a correct example of a chemical compound?

Accepted Answer

Sodium chloride

Question 15

Which of the following statements about elements and compounds is true?

Accepted Answer

Compounds have properties different from the elements that compose them

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Soil

Question 17

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram ($$\mathrm{kg})$$

Question 18

A student needs to convert $$5.00$$ kilometers to meters. What is the correct answer?

Accepted Answer

$$5,000$$ meters

Question 19

Which of the following best describes the process of electrolysis of water?

Accepted Answer

A chemical reaction that decomposes water into hydrogen and oxygen using electricity

Question 20

Which of the following is the correct scientific notation for $$0.00045$$?

Accepted Answer

$$4.5 	imes 10$$^{-4}$$

Introduction to Matter, Chemical Composition, and Measurement in GOB Chemistry

Guida di studio - Domande di pratica