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Building Blocks of Matter

Year 8 Science Revision

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Across
4.A pure substance made of only one type of atom
8.Found within the nucleus and has a positive charge
10.Made of two or more atoms bonded together, forming a small particle
11.A combination of substances in which each keeps its own properties, the substances are mixed together and are easily separated
13.Found within the shells of an atom and has a negative charge
15.The product of a reaction between sulfur dioxide and nitrogen oxides
17.Elements that are lustrous, malleable, ductile and good conductors
18.The building block of matter and is indivisible
20.A chemical compound that is added in small amounts to a solution so that the pH of the solution can be determined visually.
21.Change that results in a new substance being formed
22.A change in size, shape or state, these changes are easy to reverse
23.Contain hydrogen ions (H+) and have a sour taste
24.Elements that are brittle, melt at low boiling points and are poor conductors
Down
1.Chemical substance used up in a chemical reaction
2.A base that ranges between 8-9 is known as a __________ base
3.new chemical substance that results from a chemical reaction
5.An acid that ranges between 1-2 is known as a ________ acid
6.Contain a lot of hydroxide ions (OH-) and have a bitter taste
7.This chart lists all the known elements and arranges them according to their atomic number
9.When an acid reacts with a base it produces a salt and water. This is known as a ___________________ reaction
12.Found within the nucleus and has a neutral charge
14.A substance made up of two or more different types of atoms bonded together
16.The mass of an atoms nucleus, m=p+n
17.Elements that have the appearance of metals but not all of the other properties of metals
18.The number of protons in an atom, it determines which element an atom is.
19.A figure expressing the acidity or alkalinity of a solution

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