Question 1

Which of the following best describes the difference between a crystalline solid and an amorphous solid, as shown in the first image?

Accepted Answer

Crystalline solids have a well-ordered, three-dimensional structure, while amorphous solids lack long-range order.

Question 2

Based on the second image, which of the following statements about air and seawater is correct?

Accepted Answer

Both air and seawater are mixtures composed of different molecules and elements.

Question 3

Refer to the classification diagram in the third image. Which of the following is an example of a homogeneous mixture?

Accepted Answer

Sweetened tea

Question 4

The fourth image shows a crystal structure of sodium chloride. What property of sodium chloride does this image illustrate?

Accepted Answer

It is a crystalline solid with a regular, repeating arrangement of atoms.

Question 5

The fifth image shows water being heated in a flask. Which physical property of water is being demonstrated?

Accepted Answer

Boiling point

Question 6

In the sixth image, water molecules are shown in both the liquid and gaseous state. What does this illustrate about physical changes?

Accepted Answer

Physical changes do not alter the chemical identity of the molecules.

Question 7

The seventh image shows a chemical reaction. According to the law of conservation of mass, which statement is correct?

Accepted Answer

The total mass of the reactants equals the total mass of the products.

Question 8

Which separation technique, as shown in the eighth image, is best for separating a mixture of two liquids with different boiling points?

Accepted Answer

Distillation

Question 9

The ninth image shows a separation technique. What type of mixture can be separated using this method?

Accepted Answer

A heterogeneous mixture of a solid and a liquid

Question 10

Refer to the tenth image showing the reaction of butane and oxygen. If 58 g of butane reacts with 208 g of oxygen to produce 176 g of carbon dioxide and 90 g of water, what law does this demonstrate?

Accepted Answer

Law of Conservation of Mass

Question 11

Which of the following best describes a compound, as shown in the classification diagram (third image)?

Accepted Answer

A pure substance composed of two or more elements chemically bonded in fixed proportions.

Question 12

Which process is a chemical change?

Accepted Answer

Burning butane in oxygen to produce carbon dioxide and water.

Question 13

Which of the following is a physical property?

Accepted Answer

The boiling point of water is $$100^{\circ}$$\mathrm{C}$$.

Question 14

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 15

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

Accepted Answer

Ice melting to form liquid water

Question 16

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 17

Which of the following best describes the process of filtration, as shown in the ninth image?

Accepted Answer

It separates a solid from a liquid in a heterogeneous mixture.

Question 18

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 19

Which of the following is a chemical property?

Accepted Answer

The tendency of silver to tarnish

Question 20

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

Accepted Answer

An element contains only one type of atom, while a compound contains two or more different elements chemically bonded.

Introduction to Chemistry: Matter, Properties, and Changes

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