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Course: Alhussan Chemistry — Stage 7
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Alhussan Chemistry — Stage 7

Chapter 1: The Particle Model and States of Matter

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Chapter 2: Elements, Compounds and Mixtures

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Chapter 3: Metals and Non-Metals

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Chapter 4: Chemical Reactions 1

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Chapter 5: Acids and Alkalis

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Chapter 6: The Earth and Plate Tectonics

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Quiz

Chemistry 4.1 What are chemical reactions? — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Temperature during a reaction. Between which two values of "Time (s)" did "Temperature (°C)" change the most?
Dr Dabour Hub Academy - figure 1
60 and 90
0 and 30
30 and 60
90 and 120
2.
A reaction started at 22 °C and reached 41 °C. What is the temperature change?
41°C
63°C
−19°C
19°C
3.
Mass of magnesium oxide formed over time. At what value of "Time (s)" is "Mass (g)" smallest?
Dr Dabour Hub Academy - figure 2
60
40
80
0
4.
Changes classified by a class. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
5.
Temperature change of different reactions. Which has the greatest value?
Dr Dabour Hub Academy - figure 4
B
D
A
C
6.
Which is the correct definition of “Combustion”?
Two or more atoms joined.
A sealed container where nothing enters or leaves.
Reaction that transfers energy to the surroundings.
Burning in oxygen.
7.
Changes classified by a class. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
8.
Temperature during a reaction. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 6
A
B
C
D
9.
A reaction started at 18 °C and reached 41 °C. What is the temperature change?
23°C
41°C
−23°C
59°C
10.
Changes classified by a class. What is the total of all the values?
Dr Dabour Hub Academy - figure 7
19
22
13
25
11.
A reaction started at 22 °C and reached 30 °C. What is the temperature change?
8°C
30°C
52°C
−8°C
12.
What are the bubbles when magnesium is added to hydrochloric acid?
Carbon dioxide
Steam
Hydrogen
Oxygen
13.
Which is the correct definition of “Endothermic”?
Drying agent that removes water vapour.
A sealed container where nothing enters or leaves.
Reaction that takes in energy from the surroundings.
Instrument for measuring mass.
14.
Which statement is correct?
Reactions never involve energy.
Products have different properties from the reactants.
All reactions are easily reversed.
Products are on the left of the arrow.
15.
Changes classified by a class. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
16.
Temperature during a reaction. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
17.
A reaction started at 18 °C and reached 35 °C. What is the temperature change?
35°C
17°C
−17°C
53°C
18.
Temperature change of different reactions. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
19.
Which is the correct definition of “Observation”?
Yellow precipitate.
Drying agent that removes water vapour.
Smallest particle of an element.
Something you notice with your senses.
20.
A reaction started at 22 °C and fell to 12 °C. What is the temperature change?
10°C
12°C
34°C
−10°C
21.
A reaction started at 22 °C and fell to 14 °C. What is the temperature change?
14°C
8°C
36°C
−8°C
22.
Mass of magnesium oxide formed over time. By how much does "Mass (g)" change between 0 and 80?
Dr Dabour Hub Academy - figure 11
2.6
1.6
4.0
6.4
23.
Temperature during a reaction. By how much does "Temperature (°C)" change between 0 and 120?
Dr Dabour Hub Academy - figure 12
12
31
15
50
24.
Temperature rose from 20 °C to 38 °C. Calculate the percentage increase.
18%
190%
90%
47%
25.
Which statement is NOT correct?
Dissolving sugar is a physical change.
Chemical reactions are not easily reversed.
Hydrogen + oxygen → water.
Products are on the left of the arrow.
26.
Magnesium of mass 0.24 g burns to give 0.4 g of magnesium oxide. What mass of oxygen joined?
0.64 g
0.24 g
0.16 g
1.67 g
27.
The cards show observations. Which shows a chemical reaction?
Dr Dabour Hub Academy - figure 13
Card 4
Card 1
Card 3
Card 2
28.
Which is the correct definition of “Chemical reaction”?
Dull coating on a metal surface.
Reaction that takes in energy from the surroundings.
Insoluble solid formed from two solutions.
A change that makes new substances.
29.
Which statement is NOT correct?
Dissolving sugar is a physical change.
A new smell can show a chemical reaction.
In a reaction atoms are rearranged.
All reactions are easily reversed.
30.
Which term matches this definition? “A substance made in a reaction.”
Product
Reactant
Lead iodide
Filtration
31.
Which statement is correct?
Melting is a chemical reaction.
Exothermic reactions cool the surroundings.
Cooking an egg is physical.
Respiration is a chemical reaction in cells.
32.
Which is the correct definition of “Exothermic”?
Gases can escape or enter.
Identifying hazards and reducing risks.
Paint, oil or plastic that keeps out air and water.
Reaction that transfers energy to the surroundings.
33.
Magnesium 4.8 g gained oxygen to make 4.0 g oxide. Mass of oxygen?
4.0 g
−0.8 g
4.8 g
8.8 g
34.
Which term matches this definition? “A change that makes new substances.”
Irreversible
Combustion
Chemical reaction
Anhydrous calcium chloride
35.
Temperature during a reaction. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 14
"Temperature (°C)" rises to a peak at 90, then falls
"Temperature (°C)" stays the same
"Temperature (°C)" increases as "Time (s)" increases
"Temperature (°C)" decreases as "Time (s)" increases
36.
Hydrogen + oxygen → ____.
steam only
water
hydrogen peroxide
air
37.
Products have ____ properties from the reactants.
the same
no
different
identical
38.
Melting is a ____ change.
physical
biological
chemical
nuclear
39.
Fireworks show ____ given out by reactions.
light
freezing
cold
silence
40.
When magnesium burns it joins with oxygen to form magnesium ____.
oxide
hydroxide
carbonate
chloride
41.
Respiration is a chemical reaction in ____.
cells
the sky
metals
rocks
42.
Products are written on the ____.
top
right
bottom
left
43.
True or false? All reactions transfer energy to or from the surroundings.
True
False
44.
True or false? Magnesium burns with a bright white flame.
True
False
45.
True or false? Melting is a chemical reaction.
True
False
46.
True or false? Products have the same properties as reactants.
True
False
47.
True or false? Cooking an egg is a chemical change.
True
False
48.
True or false? Exothermic reactions cool the surroundings.
True
False
49.
True or false? Dissolving sugar in water is a chemical reaction.
True
False
50.
True or false? Reactions never involve energy.
True
False
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Part of Chapter 4: Chemical Reactions 1 — see every lesson and quiz in this unit.
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