Energy in Chemical Reactions

Energy in Chemical Reactions

9th - 11th Grade

15 Qs

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Energy in Chemical Reactions

Energy in Chemical Reactions

Assessment

Quiz

Chemistry

9th - 11th Grade

Medium

NGSS
HS-PS1-4

Standards-aligned

Created by

Thea Moore

Used 65+ times

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15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q1: How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful.


4 PCl3(g) → P4(s) + 6Cl2(g)

ΔH= +1207 kJ

2.31 × 103 kJ

5.95 × 103 kJ

4.33 × 103 kJ

1.68 × 103 kJ

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q2: Using the following equation for the combustion of octane, calculate the heat of reaction for 100.0 g of octane. The molar mass of octane is 114.33 g/mole.

2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

ΔH= -11018 kJ

4.82 kJ

9.64 x 103 kJ

4.82 x 103 kJ

1.26 x 104 kJ

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q3: How many kJ of heat are consumed when 5.10 g of H2 (g) is formed according to the following reaction:

CH3OH (l) → CO (g) + 2H2 (g)

ΔH° = +128.1 kJ

653 kJ

326 kJ

62 kJ

162 kJ

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q4: How many kJ of heat are released in the combustion of 16.0 g of C6H6 ?

2C6H6 + 15O2 →12CO2 + 6H2O

ΔH° = -6535 kJ

5.23 × 104 kJ

669 kJ

2.68 × 103 kJ

1.34 × 103 kJ

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q5: According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy?

SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l)

ΔH = -184 kJ

107 g

42.7 g

150. g

173 g

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q6: What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction?

2 C6H6(l) + 15 O2(g) → 12 CO2(g) + 6 H2O(g)

ΔH= -6278 kJ

21 mL

75 mL

37 mL

42 mL

7.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Q7: What mass of Cl2 must be reacted to produce 5905 kJ of energy by the following reaction?

P4 + 6Cl2 → 4PCl3

ΔH = + 2439 kJ

1030.g

171.6 g

515.0 g

300.0 g

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