Chemical and Nuclear Reactions Review

A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be

• balanced.

• unbalanced.

• an incomplete reaction.

• a replacement reaction.

Tags

NGSS.MS-PS1-5

In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the

• number of atoms in each molecule in the reaction.

• number of elements in the reaction.

• number of molecules or atoms of each substance in the reaction.

• number of molecules in each atom in the reaction.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

This is an unbalanced equation representing a chemical reaction: HgO --> Hg + O₂

Which equation below is the correctly balanced chemical equation for this reaction?

• HgO --> Hg + 2O₂

• 2HgO --> Hg + O₂

• 2HgO --> 2Hg + O₂

• 2HgO --> Hg + 2O₂

Tags

NGSS.MS-PS1-5

Which of the following is a balanced chemical equation?

• H₂O₂ --> H₂O + O₂

• 2 Fe₂O₃ + 3 C --> 4 Fe + 3 CO₂

• SO₂ + O₂ + 2 H₂O --> 4 H₂SO₄

• 2 Mg + HC1 --> MgCl₂ + H₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• The total mass of the reactants is equal to the total mass of the products.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.

Tags

NGSS.MS-PS1-5

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a

• synthesis reaction.

• decomposition reaction.

• replacement reaction.

• precipitate reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When one element replaces another element in a compound, the reaction is a ____ reaction.

• composition

• decomposition

• single replacement

• double replacement

Tags

NGSS.MS-PS1-2

What type of reaction is FeS + 2 HCl --> FeCl₂ + H₂S?

• a synthesis reaction

• a decomposition reaction

• a single replacement reaction

• a double displacement reaction

Tags

NGSS.MS-PS1-2

Which two processes could be considered opposites?

• a decomposition reaction and a single replacement reaction

• a single replacement reaction and a double replacement reaction

• a precipitate reaction and a synthesis reaction

• a synthesis reaction and a decomposition reaction

What type of chemical reaction is represented by this equation:

2Li + 2H₂O --> 2LiOH + H₂

• decomposition

• double replacement

• single replacement

• synthesis

Tags

NGSS.MS-PS1-2