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Question 6
6.
Question 7
7.
Question 8
8.
Question 9
9.
Question 10
10.
Question 11
11.
Match the term with the best option
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
Fill in the blank: Chemical changes ____ involve the breaking and making of chemical bonds.
sometimes
never
always
Fill in the blank: ________ is the measure of a quantity of energy.
Mole
Heat
Kinetic motion
Temperature
1 kilocalorie is equal to
10 calories.
1 calorie.
1,000 calories
100 calories.
Which of the following is commonly used on food packages to measure the energy content?
Joule
calorie
kilocalorie
Calorie
A reaction that releases heat is
stagnant
isothermic
endothermic
exothermic
All elements have a ΔHf of ____ kj/mole at standard temperature and pressure
4.184
1
0
273
1 calorie is equal to ____ Joules.
1,000,000
1,000
4.184
273
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.
Formation reactions that are exothermic have ΔHf values that are
positive.
negative.
equal to zero.
We can also use the equation for enthalpy change for physical phase changes. Consider the phase change H2O(l) → H2O(g). Calculate ΔHrxn.
