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Course: Alhussan Chemistry — Stage 8
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Alhussan Chemistry — Stage 8

Chapter 7: Inside Atoms

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Chapter 8: Pure Substances and Solutions

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Chapter 9: Chemical Reactions 2

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Quiz

Chemistry 9.5 Investigating food energy — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
True or false? Food energy is released by photosynthesis.
True
False
2.
Temperature rise of 20 g water from 1 g food. Which has the smallest value?
Dr Dabour Hub Academy - figure 1
Crisp
Pasta
Bread
Cashew
3.
50 g of water rose 18 °C. Energy in J? (4.2 J/g°C)
210 J
3780 J
900 J
76 J
4.
Which term matches this definition? “Error that shifts all results the same way.”
Fat
Incomplete combustion
Joule
Systematic error
5.
Which is the correct definition of “Fat”?
Measuring energy by heating water.
Uses an exothermic reaction.
Food type releasing most energy per gram.
Main gas in natural gas.
6.
Which term matches this definition? “When repeat values are similar, the data are:”
Biased
Anomalous
Invalid
Reliable
7.
25 g of water rose 40 °C. Energy in J? (4.2 J/g°C)
105 J
4200 J
168 J
1000 J
8.
25 g of water rose 22 °C. Energy in J? (4.2 J/g°C)
550 J
92 J
105 J
2310 J
9.
Measured vs label energy (kJ/100 g). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
10.
Energy is measured in ____.
grams
litres
joules
metres
11.
Energy in foods (kJ per 100 g). Which has the smallest value?
Dr Dabour Hub Academy - figure 3
Cashew nuts
Bread
Rice
Apple
12.
True or false? Foods rich in fat release most energy per gram.
True
False
13.
Which term matches this definition? “Food type releasing most energy per gram.”
Nitrate
Fat
Joule
Complete combustion
14.
50 g of water rose 40 °C. Energy in J? (4.2 J/g°C)
168 J
210 J
8400 J
2000 J
15.
Which term matches this definition? “Releasing energy from food in cells.”
Food label
Respiration
Nitrate
Systematic error
16.
Food labels give energy per ____.
1 g
1 kg
serving only
100 g
17.
A food label says 25 kJ/g but the experiment gave 8.4 kJ/g. Calculate the percentage error.
198%
66%
34%
17%
18.
Temperature rise of 20 g water from 1 g food. What is the total of all the values?
Dr Dabour Hub Academy - figure 4
76
153
171
189
19.
Which statement is correct?
Using the same mass of water makes the test fair.
Heat loss makes values too high.
Fat releases least energy.
Burning food measures pH.
20.
True or false? An apple is very high in energy.
True
False
21.
Temperature rise of 20 g water from 1 g food. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
22.
Which is the correct definition of “Kilojoule”?
1000 joules.
Reaction written with names, reactants → products.
Energy released by burning 1 g of fuel.
Main gas in natural gas.
23.
1 kJ = ____ J.
10
1 000 000
1000
100
24.
True or false? Energy is measured in joules.
True
False
25.
The temperature rise of water shows ____.
volume
mass
energy
pH
26.
Temperature rise of 20 g water from 1 g food. Which has the greatest value?
Dr Dabour Hub Academy - figure 6
Cashew
Crisp
Bread
Pasta
27.
Which foods release most energy per gram?
Foods rich in water
Foods rich in fat or oil, such as nuts
Foods rich in protein only
Foods rich in fibre
28.
Food is burnt under a tube of ____.
sand
oil
water
air
29.
Which is the correct definition of “Food label”?
Breaking down a compound using heat.
Shows energy of reactants and products.
Shows energy per 100 g.
Substance burnt to release energy.
30.
Measured 400 kJ/100 g; label 2500 kJ/100 g. Percentage of label energy measured?
16%
160%
2100%
625%
31.
Foods rich in ____ release most energy per gram.
water
fat
vitamins
fibre
32.
Measured vs label energy (kJ/100 g). Which has the smallest value?
Dr Dabour Hub Academy - figure 7
Bread (label)
Bread (measured)
Cashew (measured)
Cashew (label)
33.
Hold food close to the tube to reduce ____.
mass
light
heat loss
smell
34.
True or false? The mass of water can change each time.
True
False
35.
Temperature rise of 20 g water from 1 g food. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
36.
True or false? 1 kJ = 100 J.
True
False
37.
50 g of water rose 22 °C. Energy in J? (4.2 J/g°C)
210 J
1100 J
4620 J
92 J
38.
Why should people with nut allergies not handle the nuts?
Nuts conduct heat
Nuts are poisonous to all
Nuts are acids
They could have an allergic reaction
39.
Temperature rise of 20 g water from 1 g food. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
40.
Check for nut ____ before the experiment.
prices
colours
allergies
sizes
41.
True or false? Fat releases least energy.
True
False
42.
True or false? Wet foods give lower energy results.
True
False
43.
Which statement is correct?
Foods contain stored chemical energy.
Heat loss makes values too high.
Food energy is released by photosynthesis.
An apple is very high in energy.
44.
Which statement is NOT correct?
Heat loss is a systematic error.
1 kJ = 1000 J.
Hold food close to the tube to reduce heat loss.
Fat releases least energy.
45.
Which term matches this definition? “1000 joules.”
Kilojoule
Arrow
Product
Energy level diagram
46.
The body releases food energy by ____.
photosynthesis
respiration
combustion
digestion only
47.
True or false? Bread releases more energy per gram than nuts.
True
False
48.
Using the same mass of water makes the test ____.
biased
fair
unsafe
slower
49.
Measured vs label energy (kJ/100 g). What is the value for Bread (measured)?
Dr Dabour Hub Academy - figure 10
1000
150
500
2300
50.
True or false? Weigh the food before burning.
True
False
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Part of Chapter 9: Chemical Reactions 2 — see every lesson and quiz in this unit.
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