Take This Ultimate Year 8 Chemistry Test
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Are you good at Chemistry and metals? This year 8 chemistry test will test how much you know about Element related categories such as Metals, Nonmetals, Atoms, Compounds, and Elements. You can also test your knowledge about elements and their properties. Questions also include physical ad chemical changes, particle theory, and atomic structures. So, it is a full-package quiz for your practice and knowledge enhancement. All the best for a perfect score here!
- 1.
What are some properties that an element is Metal?
- A.
It's shiny, soluble, and bendable.
- B.
It's flat, black, and a conductor of electricity.
- C.
It's shiny, bendable, and a good conductor of electricity.
- D.
It's shiny, brittle, and a good conductor of heat
Correct Answer
C. It's shiny, bendable, and a good conductor of electricity.Explanation
Properties of Metal: shiny, hard, insoluble, bendable (malleable), ductile (pulled into a wire), and a good conductor of heat and electricity. Non-metals have opposite properties.Rate this question:
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- 2.
What is an example of a Metal?
- A.
Carbon
- B.
Copper
- C.
Silicon
- D.
Neon
Correct Answer
B. CopperExplanation
Silicon and Carbon are non-metallic solids, and Neon is a non-metallic gas.Rate this question:
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- 3.
Which one of these is a Non-metal?
- A.
Oxygen
- B.
Hydrogen
- C.
Neon
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
All of them are non-metals and gasesRate this question:
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- 4.
When trying to identify a Non-metal, you should
- A.
Find the mass of the object.
- B.
See if the object has some of the opposite physical properties of a Metal.
- C.
Make sure that it is a good Conductor of heat, Bendable, and Shiny.
- D.
It must be in the gas state.
Correct Answer
B. See if the object has some of the opposite physical properties of a Metal.Explanation
Non-metals have properties very different from Metals - many are the opposite.
They are brittle, not shiny, and poor conductors of heat and electricity.Rate this question:
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- 5.
The center of an atom is its
- A.
Nucleus
- B.
Proton
- C.
Neutron
- D.
Electron
Correct Answer
A. NucleusExplanation
An atom has 3 different sub-atomic particles known as protons, neutrons, and electrons.
The protons and neutrons are found in the middle of nucleus, surrounded by electrons spinning around the nucleus.Rate this question:
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- 6.
Most atoms are made up of
- A.
It's Electrons
- B.
Empty space
- C.
Taken up space
- D.
None of the above
Correct Answer
B. Empty spaceExplanation
The nucleus is very tiny compared to the space where the electrons are moving around.Rate this question:
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- 7.
A compound is a substance with
- A.
More than two atoms of the same element.
- B.
Two or more elements mixed together.
- C.
Only one element.
- D.
Two or more elements chemically combined
Correct Answer
D. Two or more elements chemically combinedExplanation
An atom is the smallest particle of a substance.
An element consists of only one kind of atom that can't be broken into other substances.
A compound is a substance made of two or more elements chemically combined.
A mixture is a substance made of two or more elements and/or compounds that can be separated by physical means.Rate this question:
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- 8.
The compound is
- A.
Air
- B.
Water
- C.
Carbon dioxide
- D.
Oxygen
Correct Answer
B. WaterExplanation
Air is a mixture of nitrogen, oxygen, carbon dioxide, argon, and water vapor. Carbon dioxide is a compound with the formula of CO2. Oxygen is an element that exists as a molecule O2.Rate this question:
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- 9.
Which metal does not exist as a natural metal?
- A.
Sodium
- B.
Copper
- C.
Gold
- D.
Silver
Correct Answer
A. SodiumExplanation
Natural metals are those unreactive metals that can exist as pure metals. Sodium is a very reactive metal that is normally combined with other elements to form compounds - e.g. NaCl (salt)Rate this question:
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- 10.
Which is not a correct description of an element?
- A.
Only one kind of atoms
- B.
Pure substance
- C.
Can be found in the periodic table
- D.
Can be broken down into different substances,
Correct Answer
D. Can be broken down into different substances,Explanation
An element is a pure substance that consists of only one kind of atom. An atom can't be broken down into smaller particles (substances). There are 116 elements found in the periodic table.Rate this question:
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- 11.
A physical change has the following features:
- A.
New substances are formed; they can't be changed back (irreversible)
- B.
No new substances are formed; they can be changed back (reversible)
- C.
New substances are formed; they can be changed back (reversible)
- D.
No new substances are formed; they can't be changed back (irreversible)
Correct Answer
B. No new substances are formed; they can be changed back (reversible)Explanation
A physical change normally involves a change in state and shape. It is usually reversible, and no new substances are formed.
A chemical change (reaction) produces new substances and is normally irreversible.Rate this question:
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- 12.
Which gas is the lightest (lowest density)?
- A.
Oxygen
- B.
Carbon dioxide
- C.
Hydrogen
- D.
Helium
Correct Answer
C. HydrogenExplanation
Hydrogen is the first element in the periodic table (with 1 proton, 1 electron, and no neutron), compared to Helium (the 2nd element) with 2 protons, 2 neutrons, and 2 electrons. Carbon dioxide is a gas made of Carbon and oxygen - it is denser than normal air, oxygen, hydrogen, and Helium.Rate this question:
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- 13.
The following gases exist as molecules EXCEPT
- A.
Oxygen
- B.
Neon
- C.
Carbon dioxide
- D.
Nitrogen
Correct Answer
B. NeonExplanation
A molecule is the smallest existing form of a chemical - it consists of 2 or more atoms of the same or different atoms bonded together. Oxygen exists as O2, Nitrogen as N2, and Carbon dioxide as CO2. Neon belongs to the last group of elements in the periodic table. It exists as a single atom instead of a molecule, and so do Helium and argon.Rate this question:
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- 14.
One piece of evidence for a chemical reaction is the formation of a precipitate. It is
- A.
A solid formed by mixing two solutions.
- B.
A gas formed by mixing two liquids.
- C.
A liquid formed by mixing two gases.
- D.
A solid formed by heating a liquid.
Correct Answer
A. A solid formed by mixing two solutions.Explanation
A precipitate is a solid that may be formed from mixing 2 solutions. The precipitate will deposit to the bottom of the container after some time.Rate this question:
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- 15.
Which of the following does not belong to the element - CARBON?
- A.
Graphite
- B.
Charcoal
- C.
Diamond
- D.
Glass
Correct Answer
D. GlassExplanation
The lead in a pencil is actually graphite - a form of carbon - it is not a metal - Lead. Both diamond and charcoal are the same elements - carbon. Glass and sand do not contain carbon - they are compounds known as silicon dioxide.Rate this question:
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- 16.
Which is the correct word equation for burning magnesium in the air?
- A.
Magnesium + magnesium oxide --- > oxygen
- B.
Magnesium + oxygen ---- > magnesium oxide
- C.
Magnesium oxide ---- > magnesium + oxygen
- D.
Magnesium ----- > oxygen + magnesium oxide
Correct Answer
B. Magnesium + oxygen ---- > magnesium oxideExplanation
The reactants (starting or raw materials) are Magnesium and Oxygen in the air.
The products are Magnesium oxide - white ash, and the bright white light and heat energy.Rate this question:
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- 17.
Copper sulfate is a blue crystal with a formula of CuSo4. What is the total number of atoms in one molecule of this compound?
- A.
4
- B.
5
- C.
6
- D.
7
Correct Answer
C. 6Explanation
Copper = Cu --- > 1 copper atom Sulphate = SO4 --- > 1 sulphur atom + 4 oxygen atoms Add them up = 6 atoms (but 3 elements)Rate this question:
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- 18.
Which of the following pair is CORRECT?
- A.
Magnesium ---- Ma
- B.
Potassium ----- K
- C.
Sodium ------ So
- D.
Silicon ------ S
Correct Answer
B. Potassium ----- KExplanation
Magnesium ---- Mg
Potassium --- K (Kalium)
Sodium --- Na (Natrium)
Silicon ---- SiRate this question:
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- 19.
Sublimation is a process in which
- A.
A gas changes to a solid directly on heating
- B.
A solid changes to gas directly on heating
- C.
A liquid changes to gas on heating
- D.
A solid changes to a liquid and then to gas on heating
Correct Answer
B. A solid changes to gas directly on heatingExplanation
Sublimation is a process of changing the state in which solid changes directly into gas on heating. Element Iodine is a black crystal (but non-metal) changes to a purple vapor on heating; there is no liquid iodine as such. Carbon dioxide (in the form of Dry Ice) also changes (sublimes) to a gas (carbon dioxide) directly.Rate this question:
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- 20.
Aluminium can be represented by in the periodic table. Which of the following is INCORRECT?
- A.
The mass number is 27.
- B.
The proton number is 13
- C.
The neutron number is 13
- D.
The electron number is 13
Correct Answer
C. The neutron number is 13Explanation
The larger number is the mass number = protons + neutrons.
The smaller number is the atomic number of an element = protons = electrons.
So, the neutron number can be found by subtracting the protons from the mass number
27-23 = 14 neutronsRate this question:
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