Chemistry Spring Final 24-25

A snowboarder on a mountain decides to use a heating pack to warm his hands. What type of chemical reaction is occurring in the heating pack?

• endothermic

• exothermic

• retrothermic

• intrathermic

Tags

NGSS.HS-PS1-4

Bromine reacts with excess hydrogen gas to form hydrogen bromide. H₂ + Br₂ → 2HBr ΔH° = 72.08 kJ Which classification below would correctly match the equation listed above?

• Exergonic

• Endergonic

• Exothermic

• Endothermic

Tags

NGSS.HS-PS1-4

On hot sunny days or days with thin clouds, the temperature over the land is warmer than the temperature over the water. The warmer air rises and the cooler air moves over the land, producing sea breezes. This means that —

• A. soil warms up more slowly than water

• B. water has a higher specific heat than land

• C. the air above the land becomes cool and rises

• D. land has a higher specific heat than water

Tags

NGSS.MS-ESS2-5

NGSS.MS-ESS2-6

A piece of metal and a piece of brick are both sitting in the sun. If both are the same mass, what property of matter will make the metal feel hotter to the touch?

• density

• melting point

• specific heat

• electronegativity

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

According to the Brønsted–Lowry definition of acids-base reaction, acids have the ability to-

• A. “donate” hydrogen ions

• B. “donate” hydroxide ions

• C. “accept” hydrogen ions

• D. “accept” hydroxide ions

In the following equation what is the conjugate base? HF + H₂O → F⁻ + H₃O⁺

• HF

• H₂O

• F⁻

• H₃O⁺

Select the point on this pH scale that represents a substance that is slightly basic. The pH Scale diagram shows various substances and their pH values from 0 (acidic) to 14 (alkaline/basic).

• A slightly basic substance is around pH 8 (e.g., blood).

• A slightly basic substance is around pH 2 (e.g., lemon juice).

• A slightly basic substance is around pH 14 (e.g., bleach).

• A slightly basic substance is around pH 6 (e.g., milk).

Select the point (pH number) of TWO substances that have very strong concentrations of H+ ions.

• HCl acid and Lemon

• Milk and Water

• Egg white and soap

• Drain cleaner and HCl acid

Tags

NGSS.MS-PS1-2

When a cup of coffee cools from 140°F to 120°F, what happens to the molecules in this liquid? Select TWO correct answers.

• A. The molecules gain thermal energy.

• B. The molecule's motion slows down.

• C. The molecules move closer together.

• D. The molecules move faster.

• E. The molecules gain kinetic energy.

Tags

NGSS.MS-PS1-4

A large piece of metal is sitting in a solid form. Heat is applied to it until the metal melts. What property in the metal is changed during this process?

• the chemical formula of the metal compounds

• the average kinetic energy of the metal atoms

• the atomic mass of the metal atoms

• the charge of the metal atoms

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4