Take This Ultimate Year 8 Chemistry Test

Reviewed by Zohra Sattar Waxali
Zohra Sattar Waxali, PhD (Chemistry) |
Chemistry
Review Board Member
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
, PhD (Chemistry)
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Take This Ultimate Year 8 Chemistry Test - Quiz

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 and 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!


Questions and Answers
  • 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
    The element exhibits metallic properties as it is shiny, indicating a reflective surface, bendable, signifying malleability, and functions as a good conductor of electricity, showcasing typical traits of metals. These characteristics align with the general properties observed in metallic elements within the periodic table.

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  • 2. 

    What is an example of a Metal?

    • A.

      Carbon

    • B.

      Copper

    • C.

      Silicon

    • D.

      Neon

    Correct Answer
    B. Copper
    Explanation
    Silicon and Carbon are non-metallic solids, and Neon is a non-metallic gas.

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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 above
    Explanation
    Oxygen, hydrogen, and neon are all non-metals. Oxygen and hydrogen are gases at room temperature and are part of the non-metal category in the periodic table. Neon is a noble gas, which is a specific group of non-metals known for their lack of reactivity and inability to form many compounds.

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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.

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  • 5. 

    The center of an atom is its

    • A.

      Nucleus

    • B.

      Proton

    • C.

      Neutron

    • D.

      Electron

    Correct Answer
    A. Nucleus
    Explanation
     An atom has 3 different subatomic particles known as protons, neutrons, and electrons. The protons and neutrons are found in the middle of the atom in the nucleus, and the nucleus is surrounded by electrons orbiting the nucleus.

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  • 6. 

    Most atoms are made up of

    • A.

      Electrons, protons and neutrons

    • B.

      Empty space

    • C.

      Taken up space

    • D.

      None of the above

    Correct Answer
    A. Electrons, protons and neutrons
    Explanation
    Most atoms are made up of three fundamental subatomic particles Electrons, protons and neutrons.

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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 combined
    Explanation
    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.

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  • 8. 

    The compound is

    • A.

      Air

    • B.

      Water

    • C.

      Carbon dioxide

    • D.

      Oxygen

    Correct Answer
    B. Water
    Explanation
    It is a chemical formula that represents a molecule of water, which is a fundamental and essential substance for life. Water contains 2 hydrogen atoms and one oxygen atom.

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  • 9. 

    Which metal is not normally found as a pure substance in nature? 

    • A.

      Sodium

    • B.

      Copper

    • C.

      Gold

    • D.

      Silver

    Correct Answer
    A. Sodium
    Explanation
    Sodium is a very reactive metal that is normally combined with other elements to form compounds in nature - e.g., NaCl (salt). Copper, gold, and silver are less reactive than sodium and are typically found in nature as pure substances embedded into rocks.

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  • 10. 

    Which is not a correct description of an element?

    • A.

      Only one kind of atom

    • 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 118 elements found in the periodic table.

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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.

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  • 12. 

    Which gas is the lightest (lowest density)?

    • A.

      Oxygen

    • B.

      Carbon dioxide

    • C.

      Hydrogen

    • D.

      Helium

    Correct Answer
    C. Hydrogen
    Explanation
    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.

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  • 13. 

    The following gases exist as molecules EXCEPT

    • A.

      Oxygen

    • B.

      Neon

    • C.

      Carbon dioxide

    • D.

      Nitrogen

    Correct Answer
    B. Neon
    Explanation
    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.

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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. A precipitate will often settle to the bottom of a reaction vessel after some time.

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  • 15. 

    Which of the following is not a pure form of the element CARBON?

    • A.

      Graphite

    • B.

      Charcoal

    • C.

      Diamond

    • D.

      Glass

    Correct Answer
    D. Glass
    Explanation
     The lead in a pencil is actually graphite - a form of carbon - it is not the metal Lead. Both diamond and charcoal are the same elements - carbon. Graphite, charcoal, and diamond, as well as soot and fullerenes, are carbon allotropes. Glass is made from sand that mainly contains silicon and oxygen as opposed to carbon.

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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 oxide
    Explanation
    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.

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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. 6
    Explanation
    Copper = Cu --- > 1 copper atom Sulfate = SO4 --- > 1 sulfur atom + 4 oxygen atoms Add them up = 6 atoms (but 3 elements)

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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 ----- K
    Explanation
    Magnesium ---- Mg
    Potassium --- K (Kalium)
    Sodium --- Na (Natrium)
    Silicon ---- Si

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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 heating
    Explanation
     Sublimation is a process of changing the state in which a solid changes directly into gas on heating. Element iodine is a black crystal (but non-metal) that 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 at room temperature and pressure.

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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 13
    Explanation
    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 neutrons

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Zohra Sattar Waxali |PhD (Chemistry) |
Chemistry
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 30, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Zohra Sattar Waxali
  • Jan 06, 2014
    Quiz Created by
    Edward Hung
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