Chemical Reactions

What type of change occurs during a chemical reaction?

• chemical change

• physical change

• no change occurs

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In this reaction, which substances are the reactants? Check all that apply.

CH₄ + 2O₂ → CO₂ + 2H₂O

• CH₄

• O₂

• CO₂

• H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these would be evidence that a chemical reaction has occurred?

• Bubbles formed from heating the substance.

• A color change due to red food coloring being added to the reaction.

• An odor is detected that wasn't present before the reaction.

• A temperature change because the reaction was heated.

Tags

NGSS.MS-PS1-2

Which statement about this reaction is true?

2Fe (s) + 3O₂ (g) → Fe₂O₃ (s)

• All substances in this reaction are solids.

• The Iron on the reactant side is the only solid in the chemical reaction.

• The Iron (III) oxide is a covalent compound.

• Oxygen in this reaction is a gas.

Tags

NGSS.MS-PS1-2

Which skeleton equation is correct for this reaction?

Dicarbon hexahydride reacts with oxygen gas to produce Carbon dioxide and Dihydrogen monoxide.

• CH₄ + O₂ → C₂O₄ + H₂O

• C₂H₆ + O₂ → CO₂ + H₂O

• CH₄ + O → C₂O₄ + H₂O

• C₂H₆ + O → CO₂ + H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of chemical reaction is this?

2H₂O₂ (l) → 2H₂0 (l) + O₂ (g)

• synthesis

• decomposition

• single replacement

• double replacement

• combustion

What type of chemical reaction is this?

2H₂ (g) + O₂ (g) → 2H₂O (l)

• synthesis

• decomposition

• single replacement

• double replacement

• combustion

Tags

NGSS.MS-PS1-1

What type of chemical reaction is this?

2Fe (s) + Cu(SO₄)₂ (aq) → 2FeSO₄ (aq) + Cu (s)

• synthesis

• decomposition

• single replacement

• double replacement

• combustion

What type of chemical reaction is this?

CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)

• synthesis

• decomposition

• single replacement

• double replacement

• combustion

Which answer choice correctly balances this skeleton equation?

Al (s) + O₂ (g) → Al₂O₃ (s)

• Al (s) + O₂ (g) → Al₂O₃ (s)

• 2Al (s) + O₂ (g) → Al₂O₃ (s)

• 2Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

• 4Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

Tags

NGSS.MS-PS1-5