G7 EAL Mixtures and Solutions

A(n) _____________is a pure substance that cannot be broken down into simpler substances by chemical reactions.

Answer explanation

An element is a fundamental substance that cannot be decomposed into simpler substances through chemical means, making it the correct answer to the question.

• Mixture

• Mixture and Solution

• Neither

• Mixture

• Mixture and Solution

• Neither

• Mixture

• Mixture and Solution

• Neither

• Mixture

• Mixture and Solution

• Neither

What is a mixture in which a solid and a liquid or two liquids are mixed so evenly, that it is not possible to see the separate particles called?

• mixture

• compound

• solution

• hydrogen

Answer explanation

A solution is a homogeneous mixture where the solid and liquid or two liquids are mixed so thoroughly that individual particles cannot be distinguished. This distinguishes it from other types of mixtures.

What is an element that makes up about 21% of Earth's atmosphere?

• nickle

• carbon

• nitrogen

• oxygen

Answer explanation

Oxygen is the element that makes up about 21% of Earth's atmosphere, essential for respiration in most living organisms. The other options, nickel, carbon, and nitrogen, do not account for this specific percentage.

A ____________ is the physical matter of which living or nonliving things are composed.

Answer explanation

A substance is defined as the physical matter that makes up living or nonliving things. It encompasses all materials, making it the correct term to fill in the blank.

• Mixture

• Mixture and Solution

• Neither

• Mixture

• Mixture and Solution

• Neither