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03. Elements And Compounds

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Chapter: 03. Elements And Compounds

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A pure substance is a substance that contains _ _ _ _ _ _ _ _ _ _ _ _ _ _ kind of particles.

same

Substances that have a uniform composition are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ substances.

homogeneous

Pure substances have _ _ _ _ _ _ _ _ _ _ _ _ _ _ melting and boiling points.

fixed

An element is a pure substance made up of only _ _ _ _ _ _ _ _ _ _ _ _ _ _ kind of atoms.

one

_ _ _ _ _ _ _ _ _ _ _ _ _ _ is a liquid metal.

Mercury

Sodium and potassium are _ _ _ _ _ _ _ _ _ _ _ _ _ _ metals.

soft

Metals are _ _ _ _ _ _ _ _ _ _ _ _ _ _ , meaning they can be hammered into thin sheets.

malleable

Copper wires are made possible because metals are _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

ductile

Metals typically produce a _ _ _ _ _ _ _ _ _ _ _ _ _ _ sound when struck, a property known as sonorousness.

ringing

Diamond is an extremely _ _ _ _ _ _ _ _ _ _ _ _ _ _ non-metal.

hard

_ _ _ _ _ _ _ _ _ _ _ _ _ _ is the only non-metal found in the liquid state.

Bromine

Graphite, a form of carbon, is a good conductor of _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

electricity

Elements that show some properties of metals and some properties of non-metals are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

metalloids

Gaseous elements that do not react chemically with other elements are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ gases.

noble or inert

The property that makes gold suitable for fine jewellery is its _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

lustre

The lead in pencils is made of _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

graphite

The abbreviation used to denote an element is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

symbol

Ancient scientists known as _ _ _ _ _ _ _ _ _ _ _ _ _ _ used certain signs and symbols to represent elements.

alchemists

John Dalton was the first scientist who used _ _ _ _ _ _ _ _ _ _ _ _ _ _ to represent elements.

symbols

The symbol of Iron is Fe, which is derived from its Latin name _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

Ferrum

Nitrogen comprises nearly _ _ _ _ _ _ _ _ _ _ _ _ _ _ % of all gases in the air.

Oxygen is found in greatest amount in the _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

earth’s crust

A _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a pure substance made up of two or more elements chemically combined in a fixed proportion by mass.

compound

The smallest unit of a compound that exhibits all the properties of that compound and has an independent existence is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

molecule

The 117th element, _ _ _ _ _ _ _ _ _ _ _ _ _ _ , was created by bombarding calcium ions on a berkelium target.

Tennessine

Water is formed by the combination of hydrogen and oxygen in a fixed ratio of _ _ _ _ _ _ _ _ _ _ _ _ _ _ by mass.

1:8

The components of a compound can only be separated by using _ _ _ _ _ _ _ _ _ _ _ _ _ _ methods.

chemical

The number of atoms present in the molecule of an element is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

atomicity

Oxygen (O_2) is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ molecule because it contains two atoms.

diatomic

Ozone (O_3) is an example of a _ _ _ _ _ _ _ _ _ _ _ _ _ _ molecule.

triatomic

Sulphur (S_8) is an example of a _ _ _ _ _ _ _ _ _ _ _ _ _ _ molecule.

polyatomic

Water is known as a _ _ _ _ _ _ _ _ _ _ _ _ _ _ solvent.

universal

_ _ _ _ _ _ _ _ _ _ _ _ _ _ is used in food to add taste.

Common salt / Sodium chloride

The formula of bromine molecule is _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

Br_2

The symbol O_2 represents one _ _ _ _ _ _ _ _ _ _ _ _ _ _ of oxygen.

molecule

The symbol 2O represents two _ _ _ _ _ _ _ _ _ _ _ _ _ _ of oxygen.

atoms

The chemical formula of sodium carbonate is _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

Na_2CO_3

A chemical formula also gives us information about the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of one molecule of the compound.

mass

The chemical formula of sulphuric acid is _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

H_2SO_4

Copper is mixed with zinc to produce _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

brass

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