Kelso High-Chem H-Enthalpy of Reactions

1

Match the term with the best option

Stavka koja se može prevući		Odgovarajuća stavka
Heat unique to a substance		exothermic reaction
Amount of energy transferring in a reaction		endothermic reaction
A reaction that feels warm or hot		enthalpy of reaction
A reaction that feels cold		specific heat

1

Fill in the blank: Chemical changes ____ involve the breaking and making of chemical bonds.

sometimes

never

always

1

Fill in the blank: ________ is the measure of a quantity of energy.

Mole

Heat

Kinetic motion

Temperature

1

1 kilocalorie is equal to

10 calories.

1 calorie.

1,000 calories

100 calories.

1

Which of the following is commonly used on food packages to measure the energy content?

Joule

calorie

kilocalorie

Calorie

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1

A reaction that releases heat is

stagnant

isothermic

endothermic

exothermic

1

All elements have a ΔH_f of ____ kj/mole at standard temperature and pressure

4.184

1

0

273

1

1 calorie is equal to ____ Joules.

1,000,000

1,000

4.184

273

1

Consider the phase change H₂O(l) → H₂O(g). This equation describes the phase change from liquid water to steam. Think about the heat flow that is necessary for this change to take place. What do you predict about the process?

It will be endothermic.

It will be exothermic.

1

Formation reactions that are exothermic have ΔH_fvalues that are

positive.

negative.

equal to zero.

1

We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H₂O(l) → H₂O(g). Calculate ΔH_rxn.
Use ΔH_f values from the table above.
ΔH_rxn =

527.6

-44.0

-527.6 kJ

44.0 kJ

Kelso High-Chem H-Enthalpy of Reactions

Match the term with the best option

Fill in the blank: Chemical changes ____ involve the breaking and making of chemical bonds.

Fill in the blank: ________ is the measure of a quantity of energy.

1 kilocalorie is equal to

Which of the following is commonly used on food packages to measure the energy content?

A reaction that releases heat is

All elements have a ΔHf of ____ kj/mole at standard temperature and pressure

1 calorie is equal to ____ Joules.

Consider the phase change H2O(l) → H2O(g). This equation describes the phase change from liquid water to steam. Think about the heat flow that is necessary for this change to take place. What do you predict about the process?

Formation reactions that are exothermic have ΔHf values that are

We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H2O(l) → H2O(g). Calculate ΔHrxn.Use ΔHf values from the table above.ΔHrxn =

Match the term with the best option

Fill in the blank: Chemical changes ____ involve the breaking and making of chemical bonds.

Fill in the blank: ________ is the measure of a quantity of energy.

1 kilocalorie is equal to

Which of the following is commonly used on food packages to measure the energy content?

A reaction that releases heat is

All elements have a ΔHf of ____ kj/mole at standard temperature and pressure

1 calorie is equal to ____ Joules.

Consider the phase change H2O(l) → H2O(g). This equation describes the phase change from liquid water to steam. Think about the heat flow that is necessary for this change to take place. What do you predict about the process?

Formation reactions that are exothermic have ΔHf values that are

We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H2O(l) → H2O(g). Calculate ΔHrxn.Use ΔHf values from the table above.ΔHrxn =

All elements have a ΔH_f of ____ kj/mole at standard temperature and pressure

Consider the phase change H₂O(l) → H₂O(g). This equation describes the phase change from liquid water to steam. Think about the heat flow that is necessary for this change to take place. What do you predict about the process?

Formation reactions that are exothermic have ΔH_fvalues that are

We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H₂O(l) → H₂O(g). Calculate ΔH_rxn.
Use ΔH_f values from the table above.
ΔH_rxn =

All elements have a ΔH_f of ____ kj/mole at standard temperature and pressure

Consider the phase change H₂O(l) → H₂O(g). This equation describes the phase change from liquid water to steam. Think about the heat flow that is necessary for this change to take place. What do you predict about the process?

Formation reactions that are exothermic have ΔH_fvalues that are

We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H₂O(l) → H₂O(g). Calculate ΔH_rxn.
Use ΔH_f values from the table above.
ΔH_rxn =