click below
click below
Normal Size Small Size show me how
9E Metals @ AJHS NZ
Metal reactions and properties at Albany Junior High School NZ
Question | Answer |
---|---|
Metals | Elements that are shiny, conduct heat and electricity well and often have high melting and boiling points. |
non-metals | Elements that are not shiny, and do not conduct heat and electricity well. They often have low melting and boiling points. The solid ones are brittle. |
Property | Something that is used to describe how a material behaves and what it is like. Hardness is a property of some solids. |
Salts | Compounds made in some reactions involving acids. They have a metal part and a non-metal part. The non-metal part is usually chloride, sulphate or nitrate (e.g. potassium sulphate). |
Weathered | Broken down by chemical or physical changes. |
Base | A chemical which reacts with an acid to form a salt. |
Neutralisation | Mixing an acid and a base together to make a solution with a pH of 7. |
Oxidised | When a substance reacts with oxygen to form an oxide. |
Reactive | A substance that reacts with many other substances, or reacts very easily. |
Unreactive | A substance that reacts with few other substances, or reacts very slowly or not at all. |
Corrode | When something (such as stone or metal) reacts with chemicals in the air or water and gets worn away. |
Oxide | A compound formed when something reacts with oxygen. |
Reactivity Series | A list of metals which shows them in order of their reactivity, with the most reactive at the top. |
Sulphates | Compounds containing sulphur and oxygen. They are the type of salt formed when a reaction with sulphuric acid occurs. |
Bonds | Forces holding particles together. |
displace | When one element takes the place of another in a compound – a type of substitution. |
Displacement reaction | A reaction where one element takes the place of another in a compound. |
electrolysis | A process where electricity is used to split compounds apart, normally to produce an element. |
Metals | good conductors of heat and electricity |
Metals | shiny |
Metals | solids, often with high melting points (except for mercury) |
Metals | found on the left-hand side of the Periodic Table |
Metals | sometimes magnetic – three metals are magnetic (iron, cobalt and nickel) |
Metals | form basic oxides |
Metals | rigid when thick and bendy when thin |
Metals | can be hammered into shape |
Non-metals | poor conductors of heat and electricity (except for carbon in the form of graphite which conducts electricity) |
Non-metals | dull |
Non-metals | mostly solids or gases |
Non-metals | found on the right-hand side of the Periodic Table |
Non-metals | never magnetic |
Non-metals | form acidic oxides |
Non-metals | brittle |
Non-metals | cannot be hammered into shape – the solid ones break |
metal reacting with an acid | salt and hydrogen gas is given off. |
Chlorides | made when hydrochloric acid is used. |
Sulphates | made when sulphuric acid is used. |
Nitrates | made when nitric acid is used. |
test for hydrogen | put a burning splint into a test tube of gas. If hydrogen is present, it will explode with a squeaky ‘pop’. |
Bases | l metal oxides, metal hydroxides and metal carbonates |
metal oxide / metal hydroxide reacting with an acid | form water and a salt by neutralisation. |
metal carbonate reactingwith an acid. | form salt, carbon dioxide and water by neutralisation |
test for carbon dioxide | Limewater goes milky if carbon dioxide is bubbled through it. |
Sequence to make copper sulfate | Sulphuric acid. Add copper oxide powder. Add powder until unreacted copper oxide is left. Filter & remove unreacted copper oxide. Transfer filtrate to evaporating basin. Heat basin gently. When third of water evaporates, leave to cool. Examine crystals. |