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WorksheetsGrade 8 - Elements, Compound & Mixtures
Total questions: 15
Worksheet time: 8mins
An element is a pure substance in which there are how many kinds of atoms?
one kind
two kinds
three kinds
four kinds
When two or more elements join together chemically…
a compound is formed.
a mixture is formed.
a substance that is the same as the elements is formed.
the physical properties of the substances remain the same.
How do elements join to form compounds?
randomly
in a specific mass ratio
in a ratio of 1 to 8
as the scientist plans it
How do the properties of a compound compare with the properties of the elements that make up the compound?
Only the physical properties are the same.
Only the chemical properties are the same.
All the properties are identical.
The properties are different.
By what processes can compounds be broken down?
physical changes
chemical changes
compound changes
either physical or chemical changes
What kind of pure substance forms when two elements chemically combine?
an element
a compound
a mixture
a solution
Which of the following is the process in which particles of substances separate and spread evenly throughout a mixture?
filtration
dissolving
concentration
distillation
Which of the following is true about elements?
They are impure substances.
They cannot be classified by their properties alone.
They cannot be broken down into simpler substances.
They have more than one kind of particle.
Which of the following is NOT true of compounds?
They contain two or more elements.
They form after a physical change.
They have their own physical properties.
They do not form randomly.
What can be said about the properties of a compound?
They are different from the properties of the elements that form
the compound.
They are identical to the properties of the elements that form the compound.
They are not unique.
They are formed after a physical reaction.
What is a pure substance made of two or more elements that are chemically combined called?
a solution
a compound
a mixture
an element
If a spoonful of salt is mixed in a glass of water, what is the water called?
a solute
a solution
a solvent
an element
An element contains only one kind of
particle.
property.
protein.
raw material.
How is a compound different from a mixture?
Compounds have two or more components.
Each substance in a compound loses its characteristic properties.
Compounds are commonly found in nature.
Solids, liquids, and gases can form compounds.
What is the name of compound consist of only potassium and oxygen atom?
Potassium oxygen
Oxido potassium
Oxypotasside
Potassium oxide
