Chemical Reactions Assessment

Is this equation balanced?

• YES

• NO

Tags

NGSS.MS-PS1-5

The main compound of natural gas is methane (CH₄).

When methane reacts with oxgyen gas (O₂),
carbon dioxide (CO₂) and water vapor (H₂0) are produced.

CH₄ + O₂ ➞ CO₂ + H₂0

Does this change absorb heat or release heat?

• absorb heat (endothermic)

• release heat (exothermic)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

This balanced equation shows what kind of reaction?

• synthesis

• decomposition

• replacement

Tags

NGSS.MS-PS1-2

Suppose you find the mass of an iron object, let it rust, and measure the mass again.

Predict whether the mass will increase, decrease, or stay the same.

Explain your answer in terms of the law of conservation of mass. Hint: The law of conservation of mass states that matter cannot be created or destroyed, only rearranged.

Evaluate responses using AI:

OFF

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following results in a chemical change in matter?

• bending a straw

• boiling water

• braiding hair

• burning wood

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What evidence in the photo tells you that a chemical reaction may have occurred?

Evaluate responses using AI:

OFF

Tags

NGSS.MS-PS1-2

How can you balance a chemical equation?

• Change the coefficients.

• Change the products.

• Change the reactants.

• Change the subscripts.

Tags

NGSS.MS-PS1-5

Steel that is exposed to water and salt rusts quickly. If you were a shipbuilder, how would you protect a new ship?

• Wax the ship

• Paint the ship

• Oil the ship

• Polish the ship

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

This balanced equation shows what kind of reaction?

• synthesis

• decomposition

• replacement

Tags

NGSS.MS-PS1-2

Explain why the burning of methane (CH₄ + O₂ ➞ CO₂ + H₂0) is a chemical change, not a physical change.

Evaluate responses using AI:

OFF

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5