MJU3: Lesson 2 Quiz

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 the 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

Ethane (C₂H₆) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation. 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Which substance is a product in this reaction?

• carbon (C)

• oxygen (O₂)

• water (H₂O)

• ethane (C₂H₆)

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 reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances listed on the right side of a chemical equation are the

• Yields

• Reactants

• Products

• Precipitates

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many molecules of KNO₃ are shown?

• 1

• 2

• 3

• 4

Identify the reactant(s) and product(s) of the reaction.

• All three are reactants and none are products.
• Hydrogen and water are the reactants, and oxygen is the product.
• Water and oxygen are the reactants, and hydrogen is the product.
• Hydrogen and oxygen are the reactants, and water is the product.
  

How many Elements are in the compound C₂H₈O ?

• 2
• 1
• 3
• 0

Tags

NGSS.MS-PS1-1

How many total atoms are in the compound C₂H₈O ?

• 11
• 2
• 8
• 1

Tags

NGSS.MS-PS1-1

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• NO!

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5