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AQA GCSE Chemistry Revision > Atoms, elements and compounds > Flashcards

Atoms, elements and compounds Flashcards

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1
Q

What is the chemical symbol for sodium?

A

Na

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2
Q

Where are non-metals found in the periodic table?

A

On the right

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3
Q

What is a molecule?

A

Two or more atoms held together by chemical bonds

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4
Q

Name 7 elements that exist as molecules (go round in pairs).

A
  • Iodine
  • Bromine
  • Chlorine
  • Fluorine
  • Oxygen
  • Nitrogen
  • Hydrogen
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5
Q

What is a compound?

A

A substance that contains two or more elements which are chemically combined

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6
Q

What is the formula for magnesium oxide?

A

MgO

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7
Q

What is the formula for carbon dioxide?

A

CO2

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8
Q

What is the formula for water?

A

H2O

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9
Q

What is the formula for methane?

A

CH4

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10
Q

What is the formula for ammonia?

A

NH3

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11
Q

What is an element?

A

A substance that contains only one type of atom

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12
Q

What is an ion?

A

A charged particle formed when an atom loses or gains electrons

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13
Q

What charge does an electron have?

A

A negative charge

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14
Q

Name the three subatomic particles that make up atoms.

A
  • Protons
  • Neutrons
  • Electrons
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15
Q

What is the formula for a magnesium ion?

A

Mg2+

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16
Q

What is the formula for a chloride ion?

A

Cl-

17
Q

What are reactants?

A

Substances that react together in a chemical reaction

18
Q

What is a product?

A

A substance that is formed in a chemical reaction

19
Q

Sodium and chlorine react together to make sodium chloride.

What is the word equation for this reaction?

A

sodium + chlorine → sodium chloride

20
Q

What is the state symbol for a solid?

A

(s)

21
Q

What is the state symbol for a liquid?

A

(l)

22
Q

What is the state symbol for a gas?

A

(g)

23
Q

What is the state symbol for an aqueous solution?

A

(aq)

24
Q

What does aqueous solution mean?

A

Dissolved in water

25
Q

What is meant by the law of conservation of mass?

A

No atoms are created or destroyed during a chemical reaction, so the mass of the reactants is equal to the mass of the products

AQA GCSE Chemistry Revision (13 decks)

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