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Year 8 Science > 9F - Reactivity > Flashcards

9F - Reactivity Flashcards

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1
Q

What is an implosion?

A

An object breaking down inwards. It collapses into itself.

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2
Q

What triggers an implosion?

A

The forces like pressure, gravity or an explosion that starts the process.

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3
Q

What is an explosion?

A

It is generally a chemical reaction where an object breaks down outwards.

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4
Q

What is released in a chemical reaction?

A

Heat
Light
Pressure
Gases

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5
Q

What are exception that are not explosions?

A

Eruptions

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6
Q

Why are eruptions an exception of a chemical reation?

A

They are physical changes.

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7
Q

What is a Physical change?

A

Reversible
Do not create new substance
Properties don’t change

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8
Q

What is a chemical change?

A

Not easily reversible
Creates new substance
Rearranges atoms into new combinations
Properties change
Gases may be produced
Could change
Ph
Colour
Smell
Taste

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9
Q

Examples of Physical Changes?

A

Mixing things
Dissolving things
State of matter changes

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10
Q

Examples of Chemical changes?

A

Burning
Cooking
Roasting
Fermentation
Oxidation

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11
Q

What happens in a chemical reaction?

A

Atoms in the reactants are rearranges to from new products. The new products have different properties.

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12
Q

What do the smaller subscript numbers represent in a chemical formula?

A

They tell us how many atoms of that element are in the compound.

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13
Q

What is a formula?

A

A fixed ration of elements in a compound.

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14
Q

What is reactivity?

A

A chemical property of a substance.

The ability to participate in a chemical reaction.

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15
Q

What is an example of reactivity?

A

Precious metals that do not react with most substance because they have low reactivity.

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16
Q

What is a Nobel gas?

A

It is group 0 in the periodic table.

17
Q

What is an example of a noble gas?

A

Helium
Neon
Argon
Crypton
Xenon

18
Q

What is the reactivity of a noble ga?

A

Noble gases are not reactive.

19
Q

What is an alkali metal?

A

It is group 1 in the periodic table.

20
Q

What is the reactivity of an Alkali metals?

A

Very high because they are some of the most reactive metals.

21
Q

What is a Halogen?

A

It is a group 7 non-metal

22
Q

What is the reactivity of Halogens?

A

Some of the are also highly reactive.

23
Q

What is the reactivity of Halogens?

A

Some of the are also highly reactive.

24
Q

What is an example of a Halogen?

A

Lithium
Sodium
Potassium
Rubidium
Caesium
Francium

25
Q

What is the reactivity of Sodium and Chlorine?

A

They are very reactive.

26
Q

What is the product of the reaction of a metal and oxygen?

A

Metal + Oxygen = Metal Oxide
Metal + 2 oxygen = Metal Dioxide

27
Q

What is the product of the reaction of a metal and water?

A

Metal + Water = Metal Hydroxide + Hydrogen

28
Q

What is the product of a metal and an acid?

A

Metal + acid = Metal salt + Hydrogen

29
Q

What are the 3 ways to show chemical reactions?

A

Word Equations

Particle Diagrams

Symbol Equations

30
Q

What is a Word Equasion?

A

We use the name of the substance in the equations.

31
Q

What is a Particle Diagram?

A

A box in which coloured balls are draw to represent atoms or molecules.

32
Q

What is a Symbol Equation?

A

You use the symbols of elements from the periodic table in the correct formula

33
Q

How do you prevent metals from oxidisation or corrosion?

A

Painted
Coated in a more sacrificial metals

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