Q: Which of the following is the correct formula for calculating density?

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 1

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

Accepted Answer

Burning a candle

Question 2

A student observes that when vinegar is mixed with baking soda, bubbles form and a gas is released. Which property of baking soda is being demonstrated?

Accepted Answer

Its chemical property of reacting with acids

Question 3

Which of the following best describes a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 4

Which statement correctly distinguishes between a physical and a chemical change?

Accepted Answer

A chemical change results in the formation of new substances

Question 5

Which of the following is a pure substance that can be broken down into simpler substances by chemical means?

Accepted Answer

Table salt ($$NaCl)$$

Question 6

A sample of water is heated from $$25^\circ C to$$ $$110^\circ C. $$Which state changes does it undergo?

Accepted Answer

Liquid to gas

Question 7

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 8

Which of the following best describes the composition of a chemical compound?

Accepted Answer

Atoms of two or more elements combined in a fixed ratio

Question 9

Which of the following is a correct chemical formula for a molecule containing two hydrogen atoms and one oxygen atom?

Accepted Answer

$$H_2O$$

Question 10

A student measures the mass of a sample as $$12.5$$ grams and its volume as $$5.0 mL. $$What is the density of the sample?

Accepted Answer

$$2.5\ \mathrm{g/mL}$$

Question 11

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

Accepted Answer

Pot pie

Question 12

Which of the following statements about elements is TRUE?

Accepted Answer

Elements are represented by unique chemical symbols

Question 13

Which of the following best describes the process of rusting iron?

Accepted Answer

A chemical change because new substances are formed

Question 14

Which of the following is the correct scientific notation for the number $$0.00056$$?

Accepted Answer

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

Question 15

A sample of a compound is decomposed by passing an electric current through it, producing hydrogen and oxygen gases. Which compound is most likely being decomposed?

Accepted Answer

Water ($$H_2O)$$

Question 16

Which of the following is a correct statement about mixtures?

Accepted Answer

The components of a mixture retain their individual properties

Question 17

Which of the following is a physical change that occurs in the kitchen?

Accepted Answer

Boiling water

Question 18

Which of the following is the correct formula for calculating density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 19

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

Accepted Answer

The ability of iron to rust

Question 20

A student is given a sample that is uniform throughout and cannot be separated by physical means. The sample can be broken down into simpler substances by chemical means. What is the best classification for this sample?

Accepted Answer

Chemical compound

Chapter 1: Measurement and the Properties of Matter – Study Notes

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