Science Midterm Chapter 13 (add important questions from ur slides)

Question 1

What are the two categories that make up substances?

Answer 1

Elements and Compounds

Question 2

Chlorine, Oxygen, and Carbon are all examples of what type of substance?

Answer 2

Elements

Question 3

True or False: Compounds can be physically separated.

Answer 3

False

Question 4

Is the composition of substances always the same or different?

Answer 4

Same

Question 5

True or False: Elements have ionic and covalent bonds.

Answer 5

False

Question 6

What are the two types of mixtures?

Answer 6

Homogeneous and Heterogeneous

Question 7

What is another name for a homogeneous mixture?

Answer 7

Solution

Question 8

True or False: The particles that make up a homogeneous are unevenly mixed.

Answer 8

False

Question 9

Mixing is a ______ change.

Answer 9

Physical

Question 10

What is an acid?

Answer 10

A substance that produces a hydronium ion when dissolved in water.

Question 11

Can mixtures be separated, and by what method?

Answer 11

Yes, Physical

Question 12

What is a hydronium ion?

Answer 12

A positively charged ion formed when an acid dissolves in water.

Question 13

What are the two parts of a solution?

Answer 13

Solvent, Solute

Question 14

Nearly all acid molecules contain one or more _______ atoms.

Answer 14

Hydrogen

Question 15

What part of a solution exists in the greatest quantity?

Answer 15

Solvent

Question 16

When an acid mixes with _______, the ________ atom separates from the acid.

Answer 16

Water, Hydrogen

Question 17

What is the chemical formula for a hydronium ion?

Answer 17

H₃O⁺

Question 18

What is a base?

Answer 18

A substance that produces hydroxide ions when dissolved in water.

Question 19

What is a hydroxide ion?

Answer 19

A negatively charged ion formed when a base dissolves in water.

Question 20

What is one practical use of bases in everyday life?

Answer 20

Cleansers like shampoo, dish detergent, and window cleaner.

Question 21

What type of taste do bases add to food?

Answer 21

Bitterness

Question 22

What is the chemical formula for a hydroxide ion?

Answer 22

OH-

Question 23

True or False: Solutions can exist in all three states of matter.

Answer 23

True

Question 24

True or False: Water almost always exists as a solution.

Answer 24

True

Question 25

Like dissolves _______.

Answer 25

Like