Type of Chemical Reactions

What type of reaction occurs when hydrogen and oxygen combine to form water?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

Tags

NGSS.MS-PS1-5

A chemist is trying to create a new compound in the lab. He combines OsO₄ and PtCl₄ in a reaction, hoping to produce PtO₂ and OsCl₈. However, he realizes that the reaction is not balanced. Which of the following equations correctly balances the chemical reaction?

• OsO₄ + 2PtCl₄ --> PtO₂ + OsCl₈

• OsO₄ + 2PtCl₄ --> PtO₂ + 2OsCl₈

• OsO₄ + Pt2Cl₄ --> PtO₂ + OsCl₈

• OsO₄ + 2PtCl₄ --> 2PtO₂ + OsCl₈

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Imagine you are a chemist. Which type of reaction would you use to break down a complex substance into simpler ones?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

A blacksmith is trying to forge iron from iron ore using carbon monoxide. He realizes that the reaction Fe₂O₃ + CO --> Fe + CO₂ is not balanced. Can you help him choose the equation that shows the chemical reaction correctly balanced?

• Fe₂O₃ + 3CO --> 2Fe + 3CO₂

• 2Fe₂O₃ + 3CO --> 4Fe + 3CO₂

• Fe₂O₃ + CO --> Fe + CO₂

• Fe₂O₃ + 3CO --> 2Fe + CO₂

Tags

NGSS.MS-PS1-5

A chemist is experimenting in his lab. He wants to perform a reaction where an element replaces another element in a compound. What type of reaction is he planning to perform?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

A chemist is working in a lab and performs the following reaction: 2Hg₂I₂ + O₂ --> 2Hg₂O + 2I₂. This reaction can be best classified as being a...

• Acid-base

• Synthesis

• Single-replacement

• Double-replacement

Tags

NGSS.MS-PS1-1

Imagine you are in a chemistry lab and you accidentally touch a flask in which a chemical reaction is taking place that releases heat (an exothermic reaction). What would you likely feel?

• The flask would probably feel cooler than before the reaction started.

• The flask would probably feel warmer than before the reaction started.

• The flask would feel the same as before the reaction started.

• None of the above.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which of the following reactions is exothermic?

A. Ice cream melting on a hot day

B. Water freezing in a freezer

C. Dry ice sublimating in open air

D. Water boiling on a stove

• Ice cream melting on a hot day

• Water freezing in a freezer

• Dry ice sublimating in open air

• Water boiling on a stove

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

NGSS.MS-PS3-4

In a science experiment, two tiny hydrogen atoms combined to form a larger helium atom, releasing a significant amount of energy. This type of reaction is known as...

• Fission

• Fusion

• Radioactive Decay

• Gamma Decay

Tags

NGSS.HS-PS1-8

In a nuclear power plant, reaction A would represent...

• Fission

• Fusion

• Beta Decay

• Alpha Decay

Tags

NGSS.HS-PS1-8