Atoms and Equations

When a chemical reaction occurs, what happens to the atoms of the reactants?

• New atoms are created and form the products

• The atoms are destroyed and new ones are created to form the products

• The atoms of the reactants remain unchanged and new atoms make the products

• The atoms of the reactants break apart and rearrange to form the products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many atoms are present in the compound pictured?

• 5

• 3

• 4

• 2

Tags

NGSS.MS-PS1-1

How many elements are present in the compound pictured?

• 5

• 3

• 4

• 2

Tags

NGSS.MS-PS1-1

How many atoms are present in the compound pictured?

• 5

• 3

• 4

• 2

Tags

NGSS.MS-PS1-1

Combustion is when a __________ reacts with oxygen

• petrol
• fuel
• fire triangle
• carbon dioxide

The word equation for combustion is: fuel + oxygen --> water + ________ __________

• Carbon dioxide
• Limewater
• Carbon
• Carbon monoxide

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which side of a chemical equation is the product side?

• Left (before the arrow)
• Right (after the arrow)

Which side of a chemical equation is the reactant side?

• Left (before the arrow)
• Right (after the arrow)

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

Is this balanced?...
Fe + S --> FeS

• YES!
• NO!

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5