Building Blocks 1a Int 2

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Building Blocks 1a Int 2
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What is a group in the Periodic Table?
A column of elements
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What is a period in the Periodic Table?
A row of elements
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Why are elements placed in the same group ?
They have similar chemical properties. They have
the same number of outer electrons.
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Give the family name for the elements found in
group 1.
Alkali metals
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In which group do the halogens belong to?
Group 7
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Give the family name for the elements found in
group 0.
Noble gases
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What name is given to the elements found between
group 2 and group 3 in the Periodic Table?
Transition metals
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What does the name ending in -ide indicate about
a compound?
Two elements joined together
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What does the name ending in -ate or ite
indicate about a compound?
3 elements joined together - one of which is
oxygen
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Name the elements present in sodium silicate.
Sodium, silicon and oxygen
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Name the elements present in sodium chloride.
Sodium and chlorine
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Name the elements present in calcium hydroxide.
Calcium, hydrogen and oxygen.
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What is the difference between a mixture and a
compound?
Mixture - different atoms not
chemically joined. Compound - different atoms
joined together
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What is an element?
A substance made up of one type of atom.
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What is always formed in a chemical reaction?
New substance
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Name the type of chemical reaction which releases
heat.
Exothermic
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In an endothermic reaction do the reactants or
products have more energy?
Products - energy taken in
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In an exothermic reaction do the products have
more or less energy than the reactants?
Less - energy is released
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What changes indicate a chemical reaction has
taken place?
Colour change, energy change, gas given off,
effervescence, precipitation
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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
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Is air a mixture of gases or a compound?
A mixture of gases
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What is the percentage of nitrogen and oxygen in
air?
Nitrogen 80 Oxygen 20
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What is the test for oxygen gas?
Relights a glowing splint
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Why is the test for oxygen in air not positive?
There is not enough oxygen in the air
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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.
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Which has a lower concentration of dissolved
substance, a dilute or concentrated solution?
A dilute solution.
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Building Blocks 1a Int 2
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