Topic 9

A ______ is an organism that needs to eat other organisms to survive.

• producer

• microbe

• consumer

• decomposer

Tags

NGSS.MS-LS2-3

To _______ is to change or move from one object to another.

• interact

• transfer

• produce

• consume

Tags

NGSS.MS-LS2-3

NGSS.MS-PS3-5

Coal is a __________ energy resource.

• Renewable

• Non-renewable

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

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

If a chemical reaction absorbs more energy from the surrounding environment than it gives off, it must be ___________.

• endothermic

• exothermic

• nuclear

• irrefutable

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

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

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

CH₄ + __O₂ → CO₂ + 2H₂O

• 1

• 2

• 3

• 4

Tags

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