Chemical Change and Reactions Review

The reactants are on the left side of the chemical equation.

• True
• False

How many atoms in all are in a molecule of serotonin?

C₁₀H₁₂N₂O

• 22
• 24
• 25
• 4

Tags

NGSS.MS-PS1-1

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

• The shape of the coal changes
• Oxygen is present
• A new substance is produced
• Coal is made up of more than one element

Tags

NGSS.MS-PS1-2

Is burning wood a chemical or physical change?

• chemical
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is glass breaking a chemical or phyiscal change?

• chemical
• physical

Is hammering wood together to build a house a chemical or physical change?

• chemical
• physical

Is a a rusting bicycle a chemical or physical change?

• chemcial
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is melting butter for popcorn a chemical or physical change?

• chemical
• physical

Tags

NGSS.MS-PS1-4

What is the left part of a chemical equation called?
H_{2 +} O → H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Is this balanced?
Al + O₂ → 2Al₂O₃

• Yes
• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5