Science Grade 8 Question Preview (ID: 42532)


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Compound
a) O2
b) KMnO4 only
c) O2 and KMnO4
d) None

Mixture
a) copper
b) Iron ore only
c) copper and iron ore
d) none

Increases pressure
a) cooling
b) cooling and heating
c) heating only
d) none

Which causes the high density of solids
a) The energy of the particles are very high
b) The particles are packed closely together
c) The forces are weak
d) The forces between particles are weak

The chemical property of matter is
a) the boiling point
b) the correctness
c) the ability to react with oxygen gas
d) the state in which it is found in its natural state

The random movement of particles of gas and a liquid is known as
a) diffusion
b) kinetic energy
c) brownian motion
d) sublimation

This formula C6H12O6 is -
a) Hydrogen, Oxygen Carbon
b) Carbon, Hydrogen and Oxygen
c) Oxygen, Carbon and Hydrogen
d) Water, Hydrogen Carbon

Separated by physical means
a) O2
b) KMnO4
c) Cooling
d) None

Physical property
a) Boiling point
b) Density
c) both
d) none

Product of combustion reaction
a) Iron
b) Ore
c) Carbon monoxide only
d) All

Yellow element
a) Carbon
b) Sulfur only
c) Carbon and Sulfur
d) Neither

Choose either - Element, Compound, Mixture or Alloy: ring made of 24 carat gold
a) Element
b) Compound
c) Alloy
d) Mixture

Choose either - Element, Compound, Mixture or Alloy: Air we breathe
a) Element
b) Mixture
c) compound
d) Alloy

Choose either - Element, Compound, Mixture or Alloy: brass paper weight
a) Element
b) Compound
c) Mixture
d) Alloy

Choose either - Element, Compound, Mixture or Alloy: the gas produced when a metal reacts with an acid
a) Element
b) Compound
c) Alloy
d) Mixture

Choose either - Element, Compound, Mixture or Alloy: The earth's most common solvent
a) Element
b) Compound
c) Mixture
d) Alloy

Following elements Ne and B
a) Boron
b) boron
c) Neon and boron
d) Neither

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