Models of Chemical Reactions

Ethane (C2H6) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation. Which substance is a PRODUCT in this reaction?

• carbon (C)

• oxygen (O2)

• water (H2O)

• ethane (C2H6)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Zinc and hydrochloric acid are combined in a test tube. What can you conclude about the chemical reaction taking place? Select ALL that might apply.

• The mass of the products is exactly the same as the mass of the reactants.

• At least one new product formed is a gas.

• Molecules are changing into different molecules.

• Atoms are changing into different atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result?

• The ash has less volume than paper.

• Some of the matter is destroyed during the reaction.

• The mass of the ash cannot be accurately determined.

• Some of the products of the reaction were given off as a gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Solid magnesium, Mg, reacts with oxygen gas, O2, to form the solid magnesium oxide, MgO. Which is a balanced chemical equation (same number of atoms on each side) for this reaction?

• Mg + O -> MgO3

• Mg3 + 2O -> MgO3

• Mg + 2O -> 2MgO

• 2Mg + O2 -> 2MgO

Tags

NGSS.MS-PS1-5

When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of these is true of this process?

• The identity of each reactant remains the same

• Sulfur dioxide and sulfur trioxide are the reactants in this change

• The products have different chemical properties than those of the reactants

• The products contain more sulfur atoms and fewer oxygen atoms than the reactant

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which number completes the balanced chemical equation showing the process of rusting? If you would like scratch paper, please raise your hand and ask me. Hint, use parentheses to better help you.

• 1

• 2

• 4

• 12

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The following chemical equations represent three different chemical reactions. Based on the equations, which statement is correct?

• MgO is a reactant in one of the chemical reactions

• This is a product in one of the chemical reactions

• A total of five oxygen atoms are involved in the first reaction.

• This shows that three atoms of oxygen are involved in the reaction

Tags

NGSS.MS-PS1-5

How many oxygen (O) atoms are involved in this chemical equation?

• 4

• 8

• 14

• 12

Tags

NGSS.MS-PS1-1