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-PS1-7

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A(n) __________ is a substance that forms as a result of a chemical reaction.

• product

• reactant

• matter

• energy

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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

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NGSS.HS-PS1-4

What makes a chemical reaction endothermic?

• Heat absorption

• Release of heat

• Loss of atoms

• Gaining atoms

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NGSS.HS-PS1-4

What makes a chemical reaction exothermic?

• Heat absorption

• Release of heat

• Loss of atoms

• None of the above

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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

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NGSS.HS-PS2-6

The graph shows the temperature change of equal amounts of water and ethanol when the same amount of heat energy is applied over time. Which statement best explains why the temperature of water increases more slowly than ethanol’s?

• Water has lower cohesion, so less energy is needed to separate its molecules.

• Water has a high specific heat, meaning it absorbs a lot of energy before its temperature changes.

• Water molecules have weak hydrogen bonds, which break easily when heated.

• Ethanol’s high polarity prevents it from heating quickly.

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NGSS.MS-PS1-4

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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