CHAPTER ONE CHAPTER QUESTIONS 1 CHEMISTRY 1
The role of the arab and muslim scientists in
developmet of chemistry
1 – Which one of the following is not a Branch of Chemistry ?
A) Organic Chemistry C) Autochemistry
B) Biochemistry D) Physical Chemistry
2 – Which one of the following is not an Arab Pioneer of Chemistry?
A) Jabir Ibn Hayyan C) El macriti
B)Mimar sinan D)Abu bakr al razi
3 – .............. used lab equipments at first ?
A) Robert Boyle C) Jabir Ibn Hayyan
B) Antonie Lavoisier D) Abu Bakr Al Razi
4 – Which one of the following scientist is known as father of chemistry ?
A) Jabir Ibn Hayyan C) Thomas Edison
B) El –Macriti D) Omar Bin Hayyam
5 – Which of the following is not a step in a scientific study ?
A) Observation C) Experiment
B) Hypothesis D) Reading
6 – Give the right order for the steps in an experiment.
I. Recording data تسجيل البيانات. I
II. Conducting experiment إجراء التجربة. II
III. Setting up experimental equipment تجهيز المعدات التجريبية. III
IV. Analyzing results تحليل النتائج. IV
A) II, I, III, IV C) III, II, I, IV
B) I, I, II, IV D) II, IV, III, I
7 – What were chemists once named ?
A) Old chemists C) Alchemists
B) All chemists D) Only chemists
8 – Write five "branches of chemistry'".
1. Organic Chemistry 4. Physical Chemistry
2. Inorganic chemistry 5. Biochemistry
3. Analytical Chemistry
CHAPTER TWO CHEMISTRY 1
CHAPTER QUESTIONS 2
1. What is the most common type of matter we use in daily life ?
Discuss in the classroom.
Oxygen gas - water - milk - table salt (sodium chloride) - sugar .. etc
2. Can you cite an example of non – matter ?
Ultraviolet rays – radio waves – Light ... etc.
6. Classify the various homogeneous mixtures according to their
physical states and give examples for each.
State Examples
Solid Coins, dental fillings
Liquid Fizzy drinks
Gas Air
7. Why do we need to know the melting and the freezing points of
substances ?
To know the physical state of substances (the nature of materials)
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CHAPTER TWO
17. Classify the following as pure substance or mixture :
a. Bread mixture h. Sea water : mixture
b. Jam : mixture i. Air : mixture
c. Ice (water) : pure substance j. Oxygen : pure substance
d. Soap : mixture k. Exhaust gas : mixture
e. Orange juice : mixture l. Carbon dioxide : pure substance
f. Snowflake : pure substance
g. Milk : mixture
18. Separate the following mixtures by using separation methods,
and indicate the minimum amount of steps necessary for
separation :
a. Chalk dust + table salt
Dissolution - filtration – evaporation
b. Iron powder+ water + wood
Filtration – magnets
c. Alcohol + water + pepper
Electricity – Fractional distillation
19 – Which of the following is not matter ?
A) Chalk D) Light
B) Milk E) Wood
C) Snow
20 – Which element below is found in its liquid state at room
conditions ?
A) Mercury D) Oxygen
B) Aluminum E) Copper
C) Gold
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CHAPTER TWO CHEMISTRY 1
21 – Which one(s) of the following statements is/are correct ?
I. Gases have definite shapes.
II. All liquids flow at the same speed.
III. Petroleum (raw oil) is a mixture.
A) I only D) I and II
B) II only E) II and III
C) III only
22 – Which of the following is not a compound ?
A) Table salt D) Ammonia
B) Sugar E) Bread
C) Water
23 – What is hard water ?
A) Solid water D) A type of music
B) Difficult water E) Pure water
C) Water with some Ions
24 – Which of the following is not a physical property ?
A) Flammability D) Solubility
B) Boiling Point E) Conductivity
C) Density
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CHAPTER TWO CHEMISTRY 1
25 – Which of the following is an intensive property ?
A) Mass D) Solidity
B) Volume E) Length
C)Weight
26 – Which one(s) of the following mixture(s) could be separated
by fractional distillation ?
I. Salt from salty water
II. Sugar from a sand sugar mixture
III. Gasoline from petroleum
A) I only D) I and II
B) II only E) II and III
C) III only
27 – Sugar dissolves in water, whereas naphthalene does not. In
order to separate a sugar naphthalene mixture to obtain pure sugar,
which of the following processes, and, in which sequence, must be
followed ?
I. Evaporation
II. Dissolution in water
III. Filtration
A) III, II, I D) III, I, II
B) II, III, I E) II, I, III
C) I, III, II
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CHAPTER TWO CHEMISTRY 1
28 – .............. are the neutral subatomic particles and located in the
nucleus.
A) Elcctrons C) Neutrons
B) Atoms D) Protons
29 – The nucleus of many atoms are made up of .............
A) protons C) protons and neutrons
B) neutrons D) electrons
30 – ............ are the negatively charged subatomic particles and
located around the nucleus.
A) Electrons C) Neutrons
B) Atoms D) Protons
5
CHAPTER QUESTIONS 3
Q1 – Which one of the following is not correct for Oxygen?
A) We cannot live without oxygen.
B) We use it to get energy from food.
C) Oxygen is colorless gas.
D) Oxygen has bad smell.
Q2–Which one of the below is not correct for carbon dioxide (CO2)?
A) It is invisible gas.
B) It is more dense than air.
C) We need it for respiration.
D) It is put into soft drinks to make them fizzy.
Q3 – Carbon dioxide traps more heat than most other gases in the
atmosphere.
End of the this process what happens?
A) Greenhouse Effect
B) Global Warming
C) Damage of the Ozone
D) Tornadoes
Q4 – Write the physical states of water that exists on Earth and give
example for each state.
1 – Liquid state such as lakes, oceans.
2 – Solid state such as snow, ice.
3 – Gaseous state such as steam (water vapor).
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CHAPTER THREE CHEMISTRY 1
Q5 – What are the properties of water?
1. Pure water is transparent liquid, colorless, tasteless, and odorless.
2. Pure water boils at 100°C and Freezes at 0°C under 1 atmosphere
pressure.
3. Density of water is 1 g/cm3
4. Pure water is poor conductor of electricity.
5. Water is a universal solvent. It is able to dissolve a large number
of different substances such as table salt (NaCl), sugar (C6H12O6),
oxygen (O2), carbon dioxide (CO2), and nitrogen (N2) etc.
Q6 – How can water be separated into its components?
Electrolysis machine is filled with acidic water after that electric current is
passed through the solution. Water can be separated by this process into
hydrogen and oxygen gases. Oxygen gas (O2) is collected at the anode and
hydrogen gas (H2) is ..collected at the cathode
Q7 – What is the formula of water?
Chemical formula of water : H2O
As a chemical compound, a water molecule contains one oxygen
and two hydrogen atoms.
Q8 – Can pure water conduct electricity?
Pure water is poor conductor of electricity but when salt or sulfuric
acid is added, it becomes good conductor of electricity.
9
CHAPTER THREE CHEMISTRY 1
Q9 – Explain the greenhouse effect.
During the day sunlight warms up the Earth's surface. At night much
of the heat escapes but the gases in the atmosphere trap some of it,
thus keeping the Earth warm. This is called the greenhouse effect be
cause it is like what happens in a greenhouse. global warming may
.cause changes to the climate and rising sea levels
Q10 – What is the function of ozone layer?
Ozone is essential for life on Earth because it blocks out more than
95% of the Sun's ultraviolet rays.
Q11 – How can trash harm the organisms that live in the oceans?
1. Most plastic material that is thrown into the oceans does not break
down for thousands of years. Animals can mistake plastic
material for food and choke on it.
2. Sometimes, the oil spills out into the oceans . Oil is poisonous to
plants and animals.
Q12 – Write your own definition for nonpoint-source pollution.
Nonpoint-source pollution : is pollution that comes from many
sources instead of a single place.
Q13 – How is point-source pollution different from nonpoint-source
pollution?
Pollution that can be traced to one source is called pointsource
pollution.
Pollution that cannot be traced to a single source is called non-
point-source pollution.
10
CHAPTER FOUR CHEMISTRY 1
CHAPTER QUESTIONS 4
1 – Which one below is not a fossil fuels? ؟
A) Nuclear Energy B) Oil
C) Natural Gas D) Coal
2 – Which one of the following is not nonrenewable resource?
A) Nuclear Energy B) Natural Gas
C) Solar Energy D) Coal
3 – I. Fossil fuels produce energy
II. Fossil fuels don't cause air pollution.
III. It takes millions of years to be formed fossil fuels.
IV. Nuclear factory produce almost air pollution.
Which information above is correct? ؟
A) Only II B) I and II
C) I and III D) II, III and IV
4 – Which one of the following is not disadventages of the nuclear
energy?
A) The amount of nonrenewable uranium.
B) Nuclear power plants is radioactive.
C) They cause air pollution.
D) They can be dangerous for living things.
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CHAPTER FOUR CHEMISTRY 1
5 – Which one below is not alternative sources? ؟
A) Wind.
B) Solar Energy.
C) Hydroelectricity.
D) Geothermal Energy.
6 – Which one of the following is inexhaustible resource?
A) Solar Energy.
B) Natural Gas.
C) Nuclear Energy.
D) Wind Energy.
7 – What are the disadvantages of fossil fuels?
1. Fossil fuels are nonrenewable resources.
2. Burning fossil fuels generates chemical compounds that cause
pollution, these pollutants can cause respiratory illnesses and
acid rain also.
3. The carbon dioxide gas formed when fossil fuels are burned
might cause Earth's climate to warm.
2
CHAPTER FOUR CHEMISTRY 1
8 – Write the disadvantages and advantages of nuclear energy?
Advantages of nuclear energy :
1. Generating electricity using nuclear energy helps make the
supply of fossil fuels last longer because no fossil fuels are
burned.
2. Nuclear power plants produce almost no air pollution.
Disadvantages of nuclear energy :
1. The amount of nonrenewable uranium in Earth's crust.
2. The waste produced by nuclear power plants is radioactive and
can be dangerous to living things.
9- What is the meaning of inexhaustible energy
An inexhaustible resource : is an energy source that can't be exhaust
by humans.
3
Revision of Chapter 5 – Some Chemical Industries in Iraq
Ms. Cicy
Choose the most accurate answer from the multiple choice question below
1. What is the main purpose of the industry?
A. To destroy raw materials
B. To create goods and provide jobs
C. To decrease technology development
D. To reduce science research
Answer: B
2. What is the function of a binder in cement?
A. To make cement dry faster
B. To add color to cement
C. To hold materials together
D. To create heat in cement production
Answer: C
3. Which of the following is NOT a type of binder?
A. Mud
B. Limestone
C. Cement
D. Plastic
Answer: D
4. What is the first step in manufacturing cement?
A. Grinding clinkers with gypsum
B. Crushing raw materials
C. Heating in a kiln
D. Cooling the clinkers
Answer: B
5. What is Portland cement mainly used for?
A. Laboratory apparatus
B. Road construction
C. General construction
D. Special concrete construction
Answer: C
6. What material is added to make glass stronger?
A. Silica
B. Limestone
C. Metal oxide
D. Gypsum
Answer: B
7. What type of glass is used in laboratory equipment?
A. Soda lime glass
B. Lead glass
C. Pyrex glass
D. Glass fibers
Answer: C
8. In which method of vinegar production do bacteria grow on fruit juices?
A. Slow method
B. Rapid method
C. Evaporation method
D. Carbonization method
Answer: A
9. What is the chemical formula of sugar?
A. C12H22O11
B. H2O
C. CO2
D. NaCl
Answer: A
10. What is used to bleach paper in its production?
A. Sulfur
B. Sodium hydroxide
C. Chlorine gas
D. Calcium oxide
Answer: C
11. What is petroleum used for?
A. Glass making B. Energy production
C. Bleaching paper D. Making sugar
Answer: B
12. What material is used to make paper in Iraq?
A. Wood fibers
B. Recycled paper
C. Egyptian reed
D. Cellulose from palm trees
Answer: C
13. Which step comes first in the paper manufacturing process?
A. Drying and ironing the paper
B. Cooking the fibers with sodium hydroxide and sodium sulfide
C. Cutting and cleaning the cellulose fibers
D. Bleaching and mixing with additives
Answer: C
14. What is the first step in manufacturing sugar?
A. Heating with calcium oxide
B. Washing, cutting, and mixing sugarcanes with water
C. Filtering the solution
D. Putting in centrifugal tubes
Answer: B
15. Which type of glass is used in lenses and prisms?
A. Lead glass
B. Soda lime glass
C. Pyrex glass
D. Glass fibers
Answer: A
16. Which petroleum product is used in heavy engines of diesel motors?
A. Gas oil
B. Gasoline
C. Refinery gas
D. Kerosene
Answer: A
Fill in the gap of the questions below
11. Cement is made by grinding clinkers with _______.
Answer: gypsum
12. The rapid method of vinegar production uses _______ to speed up the
process.
Answer: warm air
13. Sugar is extracted from _______ and mixed with water before processing.
Answer: sugarcane
14. Paper is made from _______ fibers found in plants.
Answer: cellulose
15. _______ is a type of cement used in road construction.
Answer: Quick set cement
16. _______ is the process of separating the essential parts of crude petroleum.
Answer: Refining
17. The three main elements in crude petroleum are carbon, hydrogen, and
_______.
Answer: sulfur
18. Glass is made by combining silica, limestone, and _______.
Answer: additives
19. Refinery gas, such as propane and butane, is used in _______.
Answer: portable stoves and lighters
20. The bad smell of crude petroleum is due to the presence of _______.
Answer: sulfur
21. ______ is used to bleach and make paper white in the paper industry.
Answer: Chlorine gas
22. The first step in the sugar manufacturing process is to wash, cut, and mix
sugarcanes with ___________.
Answer: water
23. Glass is made by combining silica, limestone, and _______.
Answer: additives
24. In glass production, ______ is added to make the glass stronger.
Answer: limestone
25. The two main elements found in crude petroleum are carbon and ___________.
Answer: hydrogen
26. Bitumen is used as a binder, just like cement, mud and __________.
Answer: Lime
Answer the questions below
27. What are two main jobs created by industries?
Answer: Manufacturing jobs and government jobs.
28. Name two types of cement and their uses.
Answer: Portland cement - used in general construction, Quick set cement -
used in road construction.
29. What is the function of metal oxide in glass production?
Answer: It is added to produce different colors of glass.
30. How long does it take to produce vinegar using the slow method?
Answer: 40–60 days.
31. What is the purpose of adding limestone in glass manufacturing?
Answer: It makes glass stronger.
32. What is the first step in sugar manufacturing?
Answer: Washing and cutting sugarcane.
33. How is crude petroleum formed?
Answer: From the remains of animals and plants at the bottom of the sea
millions of years ago.
34. What are the five chemical industries in Iraq?
Petroleum, vinegar, paper, sugar and cement industries
35. Define cement and binder
Cement is a material that sticks things together because it contains a binder.
Binder is a substance that holds materials together in building materials like mud
blocks, cut stones, or bricks.
36. List four types of binder and cement
Type of binder: mud, cement, lime and bitumen
Type of cement: Portland, quick set, low temperature, and salt resistant
37. What are the differences between the slow and rapid methods of making
vinegar?
Answer: In the slow method, bacteria from the air turn fruit juice into vinegar
in 40–60 days. The rapid method uses wood with vinegar bacteria and warm air
to quickly change alcohol into vinegar.
38. How is crude petroleum extracted and refined into useful products?
Answer: Crude oil is extracted through rock and refined into gas for stoves,
gasoline for cars, kerosene for planes, and diesel for engines.
Chapter 6
Chemistry
Ms. Cicy Irna
Grade 7
1. What are natural chemicals?
A. Chemicals found in synthetic products
B. Chemicals made up in laboratories
C. Chemicals derived from natural resources
D. Chemicals found in cleaning agents
Answer: C
2. Which of the following is an example of a natural chemical from plants?
A. Nitrogen
B. Ammonia
C. Sugar
D. Vinegar
Answer: C
3. Which of these is a synthetic chemical?
A. Caffeine
B. Salt
C. Ammonia
D. Argon
Answer: C
4. Which chemical is obtained from the sea?
A. Oxygen
B. Salt
C. Nitric acid
D. Gasoline
Answer: B
5. Which of the following is a toxic substance?
A. Oxygen
B. Chlorine gas
C. Caffeine
D. Paint
Answer: B
6. Which of these chemicals is flammable?
A. Ammonia
B. Argon
C. Gasoline
D. Vinegar
Answer: C
7. What is an example of an explosive substance?
A. Liquid propane gas
B. Shampoo
C. Detergent
D. Nitrogen
Answer: A
8. What does a corrosive chemical do?
A. It burns easily
B. It explodes when heated
C. It slowly destroys materials like metal and skin
D. It emits a pleasant fragrance
Answer: C
9. What is a warning label for a toxic substance?
A. Do not expose to heat
B. Avoid contact with eyes and skin
C. Do not eat!
D. Keep fire away
Answer: C
10. What is the correct packaging for a solid, safe substance?
A. Paper
B. Cans
C. Glass bottles
D. Plastic containers
Answer: A
11. What is the correct packaging for a liquid chemical that evaporates easily?
A. Paper bag B. Plastic wrap
C. Bottles or cans D. Wooden box
Answer: C
12. What is the main component of soap?
A. Vinegar and sodium hydroxide
B. Fatty acid and sodium hydroxide
C. Perfume and CMC
D. Enzyme and perfume
Answer: B
13. What does a detergent contain to reduce water surface tension?
A. Perfume
B. Surfactants
C. Enzymes
D. Sodium hydroxide
Answer: B
14. What is the hydrophobic tail in a detergent responsible for?
A. Mixing with water
B. Sticking to fat and dirt
C. Increasing the volume
D. Giving a nice smell
Answer: B
15. What is added to detergent to break biological stains like blood and egg?
A. CMC
B. Enzyme
C. Sodium hydroxide
D. Filler
Answer: B
16. What ingredient in shampoo makes hair smooth?
A. Thickeners
B. Conditioner
C. Perfume
D. Preservative
Answer: B
17. What is the main component in toothpaste that helps clean teeth?
A. Calcium carbonate and glycerine B. Enzyme and detergent
C. Sodium hydroxide and salt D. CMC and conditioner
Answer: A
18. What is a characteristic of fragrance?
A. It is explosive
B. It is flammable
C. It is volatile
D. It is toxic
Answer: C
19. How is natural fragrance obtained?
A. By distillation or extraction
B. By freezing
C. By combustion
D. By filtration
Answer: A
20. What reaction is used to make synthetic fragrance?
A. Oxidation
B. Esterification
C. Hydrolysis
D. Neutralization
Answer: B
21. What type of paint contains dyes, binding substances, and solvents?
A. Water paint
B. Oil paint
C. Both A and B
D. None of the above
Answer: C
22. What ingredient in paint prevents fungus growth?
A. Coagulant
B. Fungicide
C. Perfume
D. Thickener
Answer: B
23. What is an example of artificial fertilizer?
A. Compost B. Urea
C. Manure D. Salt
Answer: B
24. What is the purpose of coagulants in paint?
A. To make the paint dry
B. To make paint thicker
C. To give a nice smell
D. To resist water
Answer: B
25. What do fertilizers provide to plants?
A. Water
B. Nutrients
C. Pesticides
D. Fragrance
Answer: B
26. A __________ substance can easily catch fire. (flammable)
27. Liquid propane gas is an example of an __________ substance. (explosive)
28. Sulfuric acid and nitric acid are __________ substances. (corrosive)
29. The active substance in whitener is __________. (chlorine)
30. Paint contains __________, binding substances, and solvents. (dyes)
31. __________ is added to paint to prevent fungal growth. (fungicide)
32. Sugar and caffeine are examples of natural chemicals from
__________.(plants)
33. Artificial chemicals are made in a __________. (laboratory)
34. The __________ tail of detergent molecules sticks to dirt and fat.
(hydrophobic)
35. Detergents contain __________, which reduce the surface tension of water.
(surfactants)
36. What are examples of chemical substances? Give 5 examples.
Soap, detergent, shampoo, paint, toothpaste, paint.
37. What does it mean of hydrophilic and hydrophobic
Hydrophilic: water loving, mixes with water
Hydrophobic: fear of water, sticks to fat and dirt
38. Draw and explain how does detergent remove dirt and fat?
The hydrophobic tail sticks to dirt and fat, while the hydrophilic head stay in
water and form micelle. Water then rinse away the dirt to leave the clothes
and dishes.
39. Write the function of the chemical substance below
a. Conditioner in shampoo: to make the hair smooth
b. Fungicide in paint: anti fungus
c. Perfume in shampoo: to give nice smell
d. Moisturizer in soap: to make skin soft
e. Filler in detergent: to increase detergent’s volume
f. CMC in detergent: to maintain cleaniness of clothes
g. Thickeners in shampoo: to make shampoo thick
h. Coagulant in paint: to make paint thicker
40. Define flammable, explosive, cossrosive and toxic, give one example for
each.
Flammable: A material that can easily catch fire and burn.
Example: alcohol
Explosive: A substance that can suddenly burst or blow up with force.
Example: liquid propane gas and a mixture of hydrogen and air
Corrosive: A chemical that can slowly destroy metal, skin, or other
materials.
Example: sulphuric acid
Toxic: A substance that is harmful or poisonous to living things.
Example: mercury
