$$2.5 \times 10$$^{-2}$$\ \mathrm{mg}$$

Question 1

Which of the following prefixes represents the smallest value?

Accepted Answer

Femto ($$10^{-15})$$

Question 2

Convert $$3.1 	imes 10$$^{15}$$ micrograms ($$\mu$$g) to grams (g).

Accepted Answer

$$3.1 	imes 10$$^{9}$$ g$

Question 3

Which of the following is a chemical change?

Accepted Answer

Rusting of a nail

Question 4

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more different kinds of atoms chemically bonded

Question 5

What is the temperature in Kelvin if the Celsius temperature is $$25\ ^\circ \mathrm{C}$$?

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 6

Which of the following is the correct symbol for the element with atomic number 12?

Accepted Answer

Mg

Question 7

Which of the following represents a physical change?

Accepted Answer

Freezing of water

Question 8

A student has a sample with a mass of $$2.5 	imes 10$$^{-2}$$ mg. What is this mass in grams?

Accepted Answer

$$2.5 	imes 10$$^{-5}$$ g

Question 9

Which of the following best describes the molecules in liquid water compared to ice?

Accepted Answer

Molecules in liquid water move more freely than in ice

Question 10

Which of the following is the correct relationship for converting Celsius to Kelvin?

Accepted Answer

$$K = C + 273.15$$

Question 11

Which of the following is NOT a physical property?

Accepted Answer

Corrosiveness

Question 12

Which of the following is the correct symbol for the element with atomic number 17?

Accepted Answer

Cl

Question 13

Which of the following is the smallest mass?

Accepted Answer

$$2.5 	imes 10$$^{-2}$$\ \mathrm{mg}$$

Question 14

Which of the following is a molecule of an element?

Accepted Answer

O$$_2$$

Question 15

Which process is represented by the equation: $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

Chemical change

Question 16

Which of the following is a correct statement about elements and compounds?

Accepted Answer

Compounds contain two or more different elements chemically combined.

Question 17

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 18

Which of the following is the correct abbreviation for the prefix 'nano'?

Accepted Answer

n

Question 19

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

Accepted Answer

Compression of oxygen gas

Question 20

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

Accepted Answer

Molecules are made of two or more atoms bonded together.

Chapter 1: Matter, Energy, and Measurement – Essential Study Notes

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