Introduction to Chemistry

If the number of protons equal the number of _____, the atom will have no charge

• protons

• neutrons

• electrons

• nucleus

Which of the following represents an element?

• H₂O

• H₂

• NaCl

• CaCO₃

Tags

NGSS.MS-PS1-1

A combination of substances that are not chemically combined is called a(n)____________. 

• mixture

• compound

• physical

An element is made up of only one kind of _____.

• isotope

• plastic

• atom

• metal

Is burning wood a chemical or physical change?

• chemical

• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Vinegar was added to baking soda, which resulted in bubbles. What type of change occurred?

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How would you classify this image?

• homogeneous mixture

• heterogeneous mixture

How would you classify this image?

• homogeneous mixture

• heterogeneous mixture

What is a pure substance made of 2 or more elements chemically combined in a specific ratio (Ex. Water)?

• Element

• Compound

• Mixture

• Solution

What is a pure substance that cannot be broken down into any other substances by chemical or physical means (Ex. Oxygen)?

• Element

• Compound

• Colloid

• Suspension