thermochemistry unit test

During chemical reactions, the chemical energy in the reactants an be changed into other forms, into heat energy?

• true

• false

Tags

NGSS.MS-PS1-4

what is the unit of measuring energy?

• Joules, J

• Kj/m

• KWatt

• mol

what is the meaning exothermic reaction.

• heat is released to the surrounding

• heat is absorbed from the surrounding

Tags

NGSS.MS-PS3-3

Surrounding do not involve in the reactions, Surrounding included (4 answers)

• thermometer

• air

• container which holds the reactants and the products

• solvent in which the reactions are taking place

• reactans and products

thermochemistry is

• the study of heat released only

• the study of changes in heat energy which take place during chemical reactions

• the study of heat absorbed only

• the energy level diagram

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

in an endothermic reaction reaction,

• The temperature of the surroundings increases.

• The reaction container becomes hot.

• Energy changes from chemical energy

  to heat energy.

• The temperature of the surroundings decreaces

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

in an exothermic reactions, (3 answers)

• The temperature of the surroundings increases.

• The reaction container becomes hot.

• Energy changes from chemical energy

  to heat energy.

• The reaction container become cold

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

NGSS.MS-PS3-3

Energy level diagram for endothermic reaction

• •The energy of the products is higher than the energy of the reactants.

• •The energy of the products is lower than the energy of the reactants.

Tags

NGSS.HS-PS1-4

If the enthalpy ter (ΔH) is negative the reaction is ____.

• Endothermic
• Exothermic
• Neutral

Tags

NGSS.MS-PS1-4

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• Reactant
• Product

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5