HEAT OF REACTION

A change in matter in which heat is absorbed is ..... process

• Endothermic

• Exothermic

• Absorbed

• Gained

Tags

NGSS.HS-PS1-4

In a chemical reaction, energy is used to :

• cause a change of state

• change the number and position of atoms

• break or form bonds within molecules

• overcome intermolecular forces

Tags

NGSS.HS-PS1-4

The branch of chemistry that focuses on the study of heat released, or absorbed by chemical or physical processes is called ……………………….

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The chemical reaction in which heat is noted on the reactant’s side is …………………………

Tags

NGSS.HS-PS1-4

The heat change at the end of a chemical reaction under constant pressure is called…………………………………

Tags

NGSS.HS-PS3-4

The device which is used to measure heat of reaction is …………………….

Which one of the following reactions are endothermic?

• X+Y →2Z+60kcal/mol

• 2C+2H2+20kcal/mol → C2H

• Ba(OH)2+CO2 → BaCO3+H2O+heat

• Fe(s)→Fe(l)

Tags

NGSS.HS-PS1-4

Endothermic or exothermic reaction?

• Endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which one of the following reaction(s) are (is) exothermic?

• Sublimation of dry ice, CO2 (s)

• Freezing of water

• combustion of gases

• Melting of salt

Check only the TRUE statements:

• In endothermic reaction, the total energy of products is bigger than that of reactants.

• ΔH of endothermic process has negative value.

• Melting is an endothermic process.

• Calorie is an unit to measure temperature.

• Sublimation is the physical process when solid turns to gas.

Tags

NGSS.HS-PS3-1