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Questions and Answers
What is an element?
What is an element?
- A substance that has a charge
- A substance that consists of one type of atom only. (correct)
- A substance that consists of many types of atoms.
- A substance that can be broken down into simpler substances by chemical means.
An element is a substance that can’t be broken down into anything simpler by ______ means.
An element is a substance that can’t be broken down into anything simpler by ______ means.
chemical
Acids react with metals to produce ______ gas and salt.
Acids react with metals to produce ______ gas and salt.
hydrogen
What is a molecule?
What is a molecule?
Halogens can undergo ______ reactions.
Halogens can undergo ______ reactions.
An atom is made up of ______, protons and neutrons, and can be divided into the nucleus and the shells.
An atom is made up of ______, protons and neutrons, and can be divided into the nucleus and the shells.
What is an ion?
What is an ion?
A ______ is a charged atom, i.e. it has lost or gained an electron to form an ion.
A ______ is a charged atom, i.e. it has lost or gained an electron to form an ion.
Acid and base reactions produce ______ and water.
Acid and base reactions produce ______ and water.
Neutralisation reactions involve the formation of ______ and salt.
Neutralisation reactions involve the formation of ______ and salt.
Oxidation numbers can be used to determine whether an element is ______ or reduced.
Oxidation numbers can be used to determine whether an element is ______ or reduced.
Displacement reactions involving solid compounds require ______ temperatures.
Displacement reactions involving solid compounds require ______ temperatures.
More reactive halogens can displace less reactive halogens in ______ solutions.
More reactive halogens can displace less reactive halogens in ______ solutions.
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