Home > Subjects > Science > Level 1 > 1.5 Acids and bases > Subject content
- Subject: Science
- AS: 90944
- Level: 1
- Credits: 4
- External
Science 1.5 Demonstrate understanding of aspects of acids and bases
Subject content
- Protons, electrons and neutron numbers in atoms and monatomic ions of elements 1 – 20.
- Electron arrangements for the atoms and monatomic (single atom) ions of elements 1 – 20 (a periodic table will be provided)
- Only protons and neutrons contribute to the mass of an atom
- Definition of “isotope” and comparison of different isotopes of the same element for protons, electron, neutron numbers, masses and chemical reactivity
- Definition of an ion and that atoms form ions by gaining/losing valence/outermost electrons until the outermost level is full
- Positive and negative ions combine to form neutral ionic solids
- Names and formulae for ionic compounds from an ion chart (provided). This includes the use of polyatomic ions such as CO32- as shown on the chart and the correct use of brackets where necessary.
- Names and formulae for hydrochloric, sulfuric and nitric acids. Other acids may be included in examination questions but their names and formulae would be supplied in the question.
- Bases required are oxide, hydroxide, carbonate and hydrogen carbonate compounds of metals
- Acidic solutions contain hydrogen ions (H+) and basic/alkaline solutions contain hydroxide ions (OH-)
- The meaning of the pH scale
- The acidic, neutral and basic colours for litmus and universal indicators
- Some uses of acids and bases are neutralisation, carbon dioxide formation and salt formation
- Limewater can be used to identify carbon dioxide
- Names and associated observations for the reactions of the required acids and bases
- Particles must collide with sufficient energy for a reaction to occur and an increase in effective collisions per second leads to an increase in the rate of reaction
- Changes in surface area of a solid, concentration of a solution or temperature can alter the rate of reaction
- The rate of a reaction changes as time progresses
- Word and balanced symbol equations for reactions.
