$CATEGORY: Science - TicTacLearn/2.Is Matter around us Pure?/2.Is Matter around us Pure?--What are the Types of Pure Substances? 

//Multiple Choice

The substances can be classified based on\:
{
~Molecular arrangement
=Chemical composition
~Atomic structure
~Physical composition
}

Choose the odd one\:
{
~Ammonia
=Gold
~Water
~Sodium chloride
}

Name the scientist who used the term "elements”.
{
~Antoine-Laurent Lavoisier
~Ernest Rutherford
=Robert Boyle
~John Dalton
}

Who among the following remains liquid at room temperature?
{
~Sodium
~Gallium
~Bromine
=Mercury
}

Which gas smells like rotten eggs?
{
~Oxygen
~Hydrogen chloride
~Carbon dioxide
=Hydrogen sulfide
}

The property of metals that makes them suitable for making wires is called\:
{
~Malleability
~Lustrous
~Conductivity
=Ductility
}

Name the scientist who defines the term "elements”.
{
~Dmitri Mendeleev
=Antoine-Laurent Lavoisier
~John Dalton
~Robert Boyle
}

Who among them is a non-metal?
{
~Silver
~Iron
=Carbon
~Sodium
}

Identify the exception among metals that are poor conductors of electricity.
{
~Lead
~Mercury
=Bismuth
~Gold
}

Which of the following are semiconductors of electricity?
{
~Chlorine
~Copper
~Oxygen
=Silicon
}

The mixture of iron and sulfur leads to the production of\:
{
~Iron sulfate
~Ferric sulfate
=Ferrous sulfide
~Iron disulfide
}

Which of the following is not a metalloid?
{
=Sulfur
~Boron
~Silicon
~Arsenic
}

A compound is a\:
{
~A non-pure substance.
=A pure substance that can be separated into simpler substances by chemical means.
~A type of element.
~A mixture of two or more substances.
}

Which of the following is the main component of air?
{
~Oxygen
=Nitrogen
~Hydrogen
~Carbon dioxide
}

Which compound is formed when hydrogen and oxygen combine?
{
~Hydrogen dioxide
~Ammonia
=Water
~Common salt
}

//True or False

The word “element” was first used in 1661.{T}

Elements are capable of being divided.{F}

Metalloids are positioned between metals and nonmetals.{T}

All metals exhibit luster.{F}

Metals cannot be flattened into thin sheets through hammering.{F}

Copper is non-metal.{F}

Non-metals display a range of colors.{T}

Hydrogen sulfide is a gas with a blue color.{F}

The melting of ice is a physical change.{T}

The properties of a mixture are the properties of its constituents.{T}

All metals are good conductors of electricity.{F}

Water is a mixture of two hydrogen and one oxygen mole.{F}


//Match the Following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Sulfur -> Non-metal
=Iron -> Metal
=Boron -> Metalloid
=Water -> Compound
}

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