Quiz 4.1 - 4.2)

Hydrogen peroxide (H₂O₂) forms from hydrogen (H⁺ ) and oxygen (O₂ ). Which chemical equation represents the formation of hydrogen peroxide from these 2 elements?

• 2 H₂O₂ → H₂ + 2 O₂

• H₂ + 2 O₂ → 2 H₂O₂

• H₂ + O₂ → H₂O₂

• 2 H₂ + 2 O₂ → H₂O₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NGSS.HS-PS1-7

A ____________________ is a substance that forms as a result of a chemical reaction.

• Product

• Reactant

• Matter

• Energy

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fireworks release heat and light energy during a chemical reaction. This is an example of a(n) ____ reaction.

• Exothermic

• Endothermic

• Hydrothermic

• Biochemical

Tags

NGSS.HS-PS1-4

What makes a chemical reaction endothermic?

• Heat absorption

• Release of heat

• Loss of atoms

• Gaining atoms

Tags

NGSS.HS-PS1-4

What makes a chemical reaction exothermic?

• Heat absorption

• Release of heat

• Loss of atoms

• None of the above

Tags

NGSS.HS-PS1-4

What role do enzymes play in living organisms?

• They decrease the number of reactants in a biochemical reaction.

• They change the products produced by a biochemical reaction.

• They increase the rate of a biochemical reaction.

• They decrease the rate of a biochemical reaction.

_______ bonds are found between water molecules.

• Oxygen

• Ionic

• Covalent

• Hydrogen

What gives water most of its unique properties?

• hydrogen bonding between water molecules

• its high boiling point

• the polarity between the oxygen and nitrogens

• the oxygen in its molecular structure

Tags

NGSS.HS-PS2-6

What percentage of the human body is made of water?

Why is water vital for life on Earth?

(Select all that apply)

• It has a relatively high boiling point, so it can remain mostly in liquid form.

• Because of water’s unique properties of cohesion and adhesion.

• Ice is less dense than water, therefore marine organisms can survive under sheets of ice.

• Water has a low specific heat so ocean temperatures are never stable.

Tags

NGSS.HS-ESS2-5