Unit 4- Changes in Matter 8th Grade Review-2024

Front

What is the pH range of human blood?

Back

The pH of human blood is between 7.38 and 7.42, indicating it is slightly basic.

Tags

NGSS.HS-LS1-3

Front

How is lemonade classified in terms of matter?

Back

Lemonade is classified as a mixture because it consists of several substances that are not chemically combined.

Front

Which substance is the strongest acid: orange juice (pH 4), bleach (pH 12.5), lemon juice (pH 2), or oven cleaner (pH 13)?

Back

Lemon juice (pH 2) is the strongest acid among the options.

Front

What do compounds have in common?

Back

Compounds can be broken down into simpler substances.

Tags

NGSS.MS-PS1-5

Front

What does the Law of Conservation of Mass state during a chemical change?

Back

According to the Law of Conservation of Mass, matter is transformed during a chemical change.

Tags

NGSS.MS-PS1-5

Front

Define a mixture.

Back

A mixture is a combination of two or more substances that are not chemically combined.

Front

What is an acid?

Back

An acid is a substance that donates protons (H+) in a solution and has a pH less than 7.

Front

What is a base?

Back

A base is a substance that accepts protons (H+) in a solution and has a pH greater than 7.

Front

What is the difference between a compound and a mixture?

Back

A compound is made up of two or more elements that are chemically combined, while a mixture consists of substances that are not chemically combined.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.