Enthalpy Review

The SI unit of heat and energy is the __________.

• calorie
• heat
• joule
• watt

Temperature is a measure of average [blank] energy of individual atoms.

• heat
• potential
• mechanical
• kinetic

Tags

NGSS.HS-PS3-4

ΔH value in an endothermic reaction is a positive number.

• True
• False

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Tags

NGSS.HS-PS1-4

Define the term Exothermic by picking the correct statements

• Products have less energy than the reactants

• ΔH is negative

• ΔH is positive

• Energy is given out to the surroundings (temperature goes up).

• products have more energy than the reactants

Define Endothermic by picking the correct statements

• ΔH is positive

• Energy is taken in from the surroundings (temperature goes down).

• Energy is given out to the surroundings (temperature goes up).

• · Products have less energy than the reactants

• products have more energy than the reactants

Tags

NGSS.HS-PS1-4

ΔH value in an endothermic reaction is a positive number.

• True
• False

Tags

NGSS.HS-PS3-1

Is this equation endo- or exo-thermic?

PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Is this equation endo- or exo-thermic?

2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

When new chemical bonds form, energy ____________.

• is taken into the system.

• is released from the system.

• stays the same in the system.

Tags

NGSS.HS-PS1-4