Chemical Change

How does a chemical change affect the composition of matter?

• Chemical change always changes the composition of matter.
• Chemical change always decreases the mass of the matter.
• Chemical change always increases the mass of the matter.
• Chemical change always changes the value of the matter.

Which of the following is NOT a clue that a chemical change has taken place?

• transfer of energy
• change in color
• change of state
• production of a gas

In a chemical change, how does the mass of the reactants compare to the mass of the products?

• The mass of the products is always greater than the mass of the reactants.
• The mass of the reactants is always greater than the mass of the products.
• The mass of the reactants is always equal to the mass of the products.
• It depends on the specific chemical change.

What is the difference between a physical change and a chemical change?

• In a physical change, the state of matter may change; in a chemical change it does not.
• In a physical change, the color may change; in a chemical change, it does not.
• In a physical change, the composition of matter changes; in a chemical change, it does not.
• In a chemical change, the composition of matter changes; in a physical change, it does not.

Tags

NGSS.MS-PS1-2

Boiling water is an example of a _____.

• physical change
• chemical change

Milk turning sour is a _____.

• physical change
• chemical change

Tags

NGSS.MS-PS1-2

Dissolving salt in water is an example of a _____.

• physical change
• chemical change

Tags

NGSS.MS-PS1-4

A metal rusting is an example of a _____.

• physical change
• chemical change

Tags

NGSS.MS-PS1-2

According the the Law of Conservation of Mass, when is mass conserved?

• Mass in only conserved in chemical changes.
• Mass is only conserved in physical changes.
• Mass is conserved in all physical and chemical changes.
• Mass is never conserved because the composition changes.

Hydrogen and oxygen react to form water.  How much water would form if 4.8 grams of hydrogen reacts with 38.4 grams of oxygen?

• 33.6 grams of water
• 184.3 grams of water
• 43.2 grams of water
• 8.0 grams of water