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Year 7 Science Flashcards Ms Lee > Atoms, elements, molecules, compounds > Flashcards

Atoms, elements, molecules, compounds Flashcards

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1
Q

What is an atom?

A

An atom is the smallest particle of a chemical element that can exist.

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2
Q

Define an element

A

An element is a substance made up of only one type of atom.

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3
Q

What type of atoms does an element contain?

A

Elements contain all the same type of atom. For e.g. gold is an element and it contains only gold atoms.

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4
Q

What type of atoms is the element helium made up of?

A

Helium atoms

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5
Q

All of the elements that exist are listed in the __________ ___________.

A

Periodic table

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6
Q

What is a compound?

A

A compound is a substance made up of atoms of 2 or more elements that are chemically bonded together.

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7
Q

Define a molecule…

A
  • A molecule is made up of a small group atoms of the same element bonded together. - Made up of only non-metal atoms.
  • Can also be an element.
    e. g. O2 is a molecule
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8
Q

Name the elements present in the compoud K2SO4

A

K = potassium

S = Sulphur

0 = Oxygen

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9
Q

How many hydrogen and oxygen atoms are present in a molecule of water (H2O)

A

2 Hydrogen atoms

1 Oxygen atom

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10
Q

Vinegar (that you put on your chips) is a compound! It has the chemical formula CH3COOH.

How many different elements are present in this compound?

A

There are 3 different elements.

Carbon, hydrogen and Oxygen

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11
Q

Ammonia has the chemcial formula NH3.

Which elements (and how many) are present in this compound.

A

Ammonia (NH3) contains 2 elements: Nitrogen and hydrogen.

Ammonia contains 1 nitrogen atom and 3 hydrogen atoms.

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12
Q

What type of substance is carbon dioxide and why?

A

Carbon dioxide is a compound.

It is a compound because it contains 2 or more elements chemically bonded together.

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13
Q

What type of substance is shown in the diagram?

Why did you choose this answer?

A

The substances is an element.

It is an element because it is made up of only one type of atom.

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14
Q

Which element has the chemical symbol Cl

(*Use your periodic table if you’re not sure)

A

Chlorine

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15
Q

Which element has the chemical symbol Na

(*Use your periodic table if you’re not sure)

A

Sodium

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16
Q

Which element has the chemical symbol Mg

(*Use your periodic table if you’re not sure)

A

Magnesium

17
Q

Which element has the chemical symbol K

(*Use your periodic table if you’re not sure)

A

Potassium

18
Q

Which element has the chemical symbol Fe

(*Use your periodic table if you’re not sure)

A

Iron

19
Q

Which element has the chemical symbol O

(*Use your periodic table if you’re not sure)

A

Oxygen

20
Q

Which element has the chemical symbol B

A

Boron

21
Q

Which element has the chemical symbol Al

A

Aluminium

22
Q

Which element has the chemical symbol F

A

Flourine

23
Q

Which element has the chemical symbol Ne

A

Neon

24
Q

Which element has the chemical symbol P

A

Phosphorus

25
Q

Which element has the chemical symbol Li

A

Lithium

26
Q

Which element has the chemical symbol H

A

Hydrogen

27
Q

1) Which elements make up the compound:

Hydrogen chloride

2) What is the chemical formula of hydrogen chloride

A

1) Hydrogen and chlorine
2) HCl

28
Q

1) Which elements make up the compound:

Carbon dioxide

2) What is the chemical formula of carbon dioxide

A

1) Carbon and oxygen
2) CO2

29
Q

1) Which elements make up the compound:

Potassium flouride

2) What is the chemical formula of potassium flouride

A

1) Potassium and flourine
2) KF

30
Q

1) Which elements make up the compound:

Zinc Oxide

2) What is the chemical formula of Zinc oxide?

A

1) Zinc and Oxygen
2) ZnO

31
Q

What type of substance is shown in the diagram?

A

The diagram shows molecules of hydrogen.

Hydrogen is also an element.

32
Q

What type of substance is shown in the diagram?

Why do you think it is this substance?

A

This substance is a compound.

It is a compound because it is made up of more than 2 elements chemically bonded together.

33
Q

What is the chemical formula for water?

A

H2O

34
Q

What is the chemical formula for sulphur dioxide?

A

SO2

35
Q

What is the chemcial formula for a molecule of oxygen?

A

O2

36
Q

What is the chemical formula for magnesium oxide?

A

MgO

37
Q

What is the chemical formula for sodium chloride?

A

NaCl

38
Q

What is the chemical formula for a molecule of nitrogen?

A

N2

Year 7 Science Flashcards Ms Lee (8 decks)

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