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What is a group in the

Periodic Table?

A column of elements

What is a period in the Periodic Table?

A row of elements

Why are elements placed in the same group ?

They have similar chemical properties.

They have the same number of outer electrons.

Give the family name for the elements found in group 1.

Alkali metals

In which group do the halogens belong to?

Group 7

Give the family name for the elements found in group 0.

Noble gases

What name is given to the elements found between group 2 and group 3 in

the Periodic Table?

Transition metals

What does the name ending in -ide indicate about a

compound?

Two elements joined together

What does the name ending in -ate or ite indicate about a

compound?

3 elements joined together - one of which

is oxygen

Name the elements present in sodium silicate.

Sodium, silicon and oxygen

Name the elements present in sodium chloride.

Sodium and chlorine

Name the elements present in calcium hydroxide.

Calcium, hydrogen and oxygen.

What is the difference between a mixture and a compound?

Mixture - different atoms not

chemically joined.

Compound - different atoms joined together

What is an element?

A substance made up of one type of atom.

What is always formed in a chemical reaction?

New substance

Name the type of chemical reaction which releases heat.

Exothermic

In an endothermic reaction do the reactants or products have more

energy?

Products - energy taken in

reactants

products

In an exothermic reaction do the products have more or less energy than the reactants?

Less - energy is released

reactants

products

What changes indicate a chemical reaction has taken

place?

Colour change, energy change, gas given off, effervescence, precipitation

What is a precipitation reaction?

Two solutions(aq) react together to form a solid (s)

Ba(NO3)2(aq) + Na2 SO4(aq) BaSO4(s) + NaNO3(aq)

the precipitate

Is air a mixture of gases or a compound?

A mixture of gases

What is the percentage of nitrogen and oxygen in air?

Nitrogen ~ 80%

Oxygen ~ 20%

What is the test for oxygen gas?

Relights a glowing splint

Why is the test for oxygen in air not positive?

There is not enough oxygen in the air

What is meant by the following terms?solute, solvent, solution and saturated

Solute - a substance which dissolves in a liquid (soluble)

Solvent - a liquid in which a solid dissolves

Solution - a mixture formed when a solute dissolves in a solvent

Saturated - a solution in which no more substance can dissolve.

Which has a lower concentration of dissolved substance, a dilute or

concentrated solution?

A dilute solution.

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