Topic 9 Review for the Topic 8 & 9 Test

What is formed when a sodium atom (Na) and a chlorine atom (Cl) react chemically to form salt (NaCl)?

• an element

• a molecule

• an electron

• a neutron

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Which of the following is possible evidence that a chemical reaction has occurred? Chose ALL that apply.

• bubbles are released

• color change

• change in smell/taste

• a precipitate forms

Tags

NGSS.MS-PS1-2

A chemical change happens when ____________.

• glass breaks

• bread bakes in the oven

• ice cream melts

• electricity flows through a wire

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a chemical reaction, what happens to the total mass of the substances involved?

• the mass increases

• the mass deacreases

• the mass stays the same

• the mass is doubled

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Consider the following formula for hydrogen peroxide: H₂O_2.

What is the coefficient?

• 0

• 1

• 2

• 4

Consider the following formula for hydrogen peroxide: H₂O_2.

How does the number of hydrogen atoms compare to the number of oxygen atoms?

• they are the same

• there is more hydrogen

• there is more oxygen

• there is not enough information provided

Tags

NGSS.MS-PS1-1

What coefficient for O₂ demonstrates the law of conservation of mass?

CH₄ + __O₂ → CO₂ + 2H₂O

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What does the Law of Conservation fo Mass state?

• Matter cannot be created or destroyed in a chemical reaction.

• New atoms are created in the products of chemical reactions.

• The total mass of the materials increases during a chemical reaction.

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

Tags

NGSS.MS-PS1-5

What happens to a pile of lumber as it burns?

• It is completely destroyed.

• It is completely changed into heat energy.

• It changes into other types of matter and energy.

• It remains unchanged.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If two reactants have a mass of 5g and 10g and they undergo a chemical change, what will the mass of the products be?

• 5g

• 10g

• 15g

• 50g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5