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End of year 8s > Science > Flashcards

Science Flashcards

1
Q

What is a chemical reaction?

A

Reaction which takes place when there is a change that is ireversible.

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2
Q

List three things that help you know a chemical change has occurred.

A
  1. A gas has been given off. Bubbles
  2. Change in colour
  3. Change in temperature
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3
Q

What does conservation of mass mean?

A

Atoms can’t disappear or reappear out of nowhere.

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4
Q

List the reactivity series in order of most reactive to least reactive.

A

Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, lead, hydrogen, copper, silver, gold.

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5
Q

Two reactants can react to form a substance called the what?

A

Product

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6
Q

What does MASH stand for?

A

Metal+acid - Salt+hydrogen

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7
Q

What does BAWS stand for?

A

Base+acid - Water+salt

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8
Q

What does CAWCS stand for?

A

Carbonate+acid - Water+carbon dioxide+salt

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9
Q

What are the different kinds of energy stores?

A

Nuclear, chemical, elastic, kinetic, electrostatic, magnetic, thermal, gravitational.

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10
Q

What are the different ways of transferring energy?

A

Radiation, mechanically, heating, electrically.

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11
Q

Metal oxides dissolve in water to form what?

A

An alkali solution called a hydroxide.

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12
Q

Define element.

A

Materials made up of one type of atom only.

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13
Q

Define compound.

A

A substance produced when two or more elements are chemically combined in a chemical reaction.

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14
Q

Define mixture.

A

Contains two or more substances that have not reacted with each other. They can be separated back into the elements or molecules they contain.

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15
Q

Define atom.

A

One particle of a substance. It can be joined to other atoms or it can be on its own.

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16
Q

Define molecule.

A

Two or more atoms which are chmeically joined together (bonded). They can be made from the same type of atoms or different atoms.

17
Q

What is the periodic table?

A

Presents all the known elements into a pattern according to their properties.

18
Q

What is a group and period on the periodic table.

A

Group- vertical columns in the periodic table.

Period- horizontal rows in the periodic table.

19
Q

Combustion=

A

Fuel+Oxygen=Water+Carbon Dioxide.

20
Q

What are the products of incomplete combustions?

A

Water and Carbon Monoxide.

21
Q

When white light is passed through a prism it is dispersed into a spectrum of which colours?

A

ROYGBIV.

22
Q

What is an acid? What is an alkali?

A

An acid is a chemical which has a pH of less than 7 on the pH scale.
An alkali is a chemical which has a pH of more than 7 on the pH scale.

23
Q

How many numbers are there on the pH scale?

A

14

24
Q

When a base is soluble it is called a what?

A

An alkali solution.

25
Q

Red litmus paper makes alkalis appear what colour?

A

Blue

26
Q

Blue litmus paper makes acids appear what colour?

A

Red/pink

27
Q

When a metal oxide reacts with an acid, the products are a salt and water. What kind of reaction is this?

A

Neutralisation reaction.

28
Q

A metal carbonate contains a metal and a carbonate. What is the chemical symbol for carbonate?

A

CO3

29
Q

When a metal carbonate reacts with an acid, water, carbon dioxide and a salt are produced. How can you tell that this reaction has taken place?

A

Bubbles are created because of the carbon dioxide gas that is given off.

30
Q

What kind of force is up thrust?

A

Contact.

31
Q

What is the formula for calculating weight?

A

Weight = mass x gravitaional field strength.

32
Q

What is the formula for calculating density?

A

Density = mass/volume

33
Q

Why is the force of drag greater on faster moving objects?

A

Because more air particles hit them.

34
Q

Speed=

A

Distance/time

35
Q

What is accelaration?

A

The rate at which speed changes.

End of year 8s (2 decks)

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