AP Chemistry Thermochemistry

A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.

• endothermic; positive

• endothermic; negative

• exothermic; negative

• exothermic; positive

Tags

NGSS.MS-PS1-4

What kind of graph is this?

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Enthalpy is energy absorbed or relased during a chemical reaction as

• light.

• heat.

• sound.

• pressure.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Heat flows from _______ to _______ objects

• cooler to warmer

• warmer to warmer

• warmer to cooler

• cooler to cooler

Heat is measured in 

• joules

• grams

• degrees celcius

Energy can not be created or destroyed, it can only be transferred refers to the....

• law of conservation of energy

• law of conservation of mass

• life facts

• law of conservation of chemistry

The transfer of thermal energy between objects of different temperatures is called...

• temperature

• heat

• internal energy

• none of these

Tags

NGSS.MS-PS3-3

Heat transfer by conduction occurs when...

• particles bump into each other

• large numbers of atoms move from place to place

• atoms give off heat in the form of electromagnetic waves

• electromagnetic waves travel from place to place through a vacuum

Heat transfer by convection occurs when...

• electrons bump into other electrons

• large numbers of atoms move from place to place

• atoms give off heat in the form of electromagnetic waves

• electromagnetic waves travel from place to place through a vacuum

Tags

NGSS.MS-PS1-4

Thermal energy always moves:

• From a high temperature object to a lower temperature object.

• From a lower temperature object to a higher temperature object.

• From an object with lower kinetic energy to an object with higher kinetic energy.

• From an object of higher mass to an object of lower mass.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4