science

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created 9 years ago by yoloswag
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10th grade
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chemistry
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1

Addition reaction

A substance is reacted with an alkene to form a compound with a single bond between the two formerly double bonded carbon atoms. An example is the decolourisation of bromine.

2

Base

A substance that will neutralise an acid is called a base. When an acid reacts with a base, a salt and water is formed. If a base is soluble in water, it is called an alkali.

3

Density

The mass of a body divided by its volume. Something has a high density of it is heavy but only small.

4

Electrolysis

The chemical change that is brought about by passing electricity through a substance. The substance must be ionic and either molten or in aqueous solution.

5

Element

This is a substance that is composed of only one kind of atom. All the atoms in an element are the same. A chemical reaction cannot break an element into anything simpler.

6

Ion

An atom or group of atoms that has gained or lost one or more elecrons.

7

Neutral

A substance that is neither acidic nor alkaline. It has a pH of 7

8

Universal indicator

This is a mixture of indicators which shows the strength of an acid or alkali as well as simply showing which it is. By comparison with a colour chart, a pH number can be selected.

9

Variable

A factor that can be changed in an experiment.

10

Vacuum

A completely empty space. The collapsing can experiment shows the effect of the pressure of gas particles.

11

Accuracy

how close a value is to the actual or true value; also see precision

12

catalyst

a chemical compound used to change the rate (either to speed up or slow down) of a reaction, but is regenerated at the end of the reaction.

13

halogens

Group 17 on the Periodic Table and are all non-metals

14

Kinetic energy

The energy of an object due to its motion.

15

radiation

energy in the form of waves or subatomic particles when there is a change from high energy to low energy states