CHM 113 QUIZ 5 QUESTIONS &
ANSWERS CORRECT 100%
HOW manywhat is the goal of the lab? - ANSWERdetermine the enthalpy of
formation of MgO
Hess's Law: - ANSWERthe overall enthalpy change in a reaction is equal to the sum
of enthalpy changes for the individual steps in the process
B-C+A
B - C + (-68.3 cal/ degree gram)
how to find enthalpy: - ANSWER1. find the heat of water
2. convert that heat to NEGATIVE version for heat of reaction
3. heat of reaction and DIVIDE by moles of reaction
4. find moles of reaction based on periodic table (24.31 g in 1 mol Mg and 16.0 g in 1
mol O
heat is measured in calories --> kcal
how many cal in kcal? - ANSWER1000 cal = 1 kcal
equation we are using: - ANSWERMg + 1/2 O2 --> MgO
what is the specific heat of water? - ANSWER1.0 cal/g/C
heat equation (q) - ANSWERQ=mc ∆T
(mass)(specific heat)(change in temperature)
mL of water are equal to _____ grams of water - ANSWERthe same exact number in
grams
Density equation - ANSWERD=m/v
density of water? - ANSWER1 g/mL
units of density? - ANSWERg/mL
what is the enthalpy: - ANSWERthe heat given off when one mole of substance is
prepared from reaction elements
what instrument is used in this lab? - ANSWERcalorimeter
what is specific heat? - ANSWERThe amount of energy needed to raise the
temperature of 1 gram of a substance by 1 degree Celsius.
ANSWERS CORRECT 100%
HOW manywhat is the goal of the lab? - ANSWERdetermine the enthalpy of
formation of MgO
Hess's Law: - ANSWERthe overall enthalpy change in a reaction is equal to the sum
of enthalpy changes for the individual steps in the process
B-C+A
B - C + (-68.3 cal/ degree gram)
how to find enthalpy: - ANSWER1. find the heat of water
2. convert that heat to NEGATIVE version for heat of reaction
3. heat of reaction and DIVIDE by moles of reaction
4. find moles of reaction based on periodic table (24.31 g in 1 mol Mg and 16.0 g in 1
mol O
heat is measured in calories --> kcal
how many cal in kcal? - ANSWER1000 cal = 1 kcal
equation we are using: - ANSWERMg + 1/2 O2 --> MgO
what is the specific heat of water? - ANSWER1.0 cal/g/C
heat equation (q) - ANSWERQ=mc ∆T
(mass)(specific heat)(change in temperature)
mL of water are equal to _____ grams of water - ANSWERthe same exact number in
grams
Density equation - ANSWERD=m/v
density of water? - ANSWER1 g/mL
units of density? - ANSWERg/mL
what is the enthalpy: - ANSWERthe heat given off when one mole of substance is
prepared from reaction elements
what instrument is used in this lab? - ANSWERcalorimeter
what is specific heat? - ANSWERThe amount of energy needed to raise the
temperature of 1 gram of a substance by 1 degree Celsius.
