Composition Decomposition

A chemical change in which two or more substances react to form a new substance is a ____________________________.

• decomposition reaction
• combination reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Another name for a combination reaction is a _________________.

• decomposition reaction
• single-replacement reaction
• synthesis reaction

A decomposition reaction can be represented as _____________________.

• AB  → A + B
• A + B → AB
• AB + CD → AC + BD
• A + BC → B + AC

A combination reaction can be represented as ________________________.

• AB + CD → AC + BD
• AB → A + B
• A + B → AB
• A + BC → B + AC

A chemical change in which a single compound breaks down into two or more simpler products is called a ______________________.

• single-replacement reaction
• combination reaction
• double-replacement reaction
• decomposition reaction

This chemical equation for mercury oxide is an example of what type of reaction?
2HgO  → 2Hg + O₂

• decomposition reaction
• combination reaction

This chemical equation for magnesium oxide is an example of what type of reaction?
2Mg + O₂  → 2MgO

• decomposition reaction
• combination reaction

The elements carbon and oxygen combine to yield the product carbon dioxide.  Choose the chemical equation for this reaction.

• S + O₂ → SO₂
• Cu + S → CuS
• C + O₂ → CO₂
• Fe + S → FeS

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Choose which equation shows conservation of mass during the electrolysis of water.

• H₂O → H_{2 +} O₂
• 2H₂O →  2H_{2 +} O₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which chemical equation shows a balanced equation for the combination reaction of magnesium metal with oxygen?

• 2Mg + O₂ → 2MgO
• Mg + O₂ => 2MgO₂

Tags

NGSS.HS-PS1-7