Chemical Formula STAAR Review

What are the products in the chemical reaction shown?

• CH₄ and O₂

• CO₂ and H₂O

• CH₄ and CO₂

• O₂ and H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many different elements are present in the reaction?

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

How many total molecules are present in the products?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

How many total atoms are present in the reactants?

• 5

• 6

• 9

• 10

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

How many oxygen atoms are in 2H₂O?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

What are the reactants in the chemical reaction?

• CH₄ and CO₂

• CO₂ and H₂O

• CH₄ and O₂

• O₂ and H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many hydrogen atoms are in CH₄?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How do we know this is a chemical reaction?

• New substances are formed.

• The color changes.

• The temperature increases.

• The substances dissolve.

Tags

NGSS.MS-PS1-2

Is this chemical reaction balanced? Justify your answer.

• Yes, because the number of atoms is the same on both sides.

• No, because there are more reactants than products.

• Yes, because the products are different from the reactants.

• No, because the reaction releases energy.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How many oxygen molecules are used in the reaction?

• 1

• 2

• 3

• 4