1. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Some new symbols to get used to…

2. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Key words; Atom, Compound, Electron, Element, Symbol

3. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element How do you know? HH

4. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Describe how elements contain only one type of atom Understand that symbols are used for atoms to show what happens in chemical reactions. Know that all 100 known elements are listed on the periodic table and groups have similar properties

5. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Atoms and symbols All substances are made up of p______. The smallest p_____ that can take part in a chemical reaction is called an a___. Elements are substances that each contain only _______ of atom. The atoms of each element are represented by a symbol. Examples of symbols used for elements are O (used for ______), N (used for _______) and Cu (used for ______). articles article tom one type oxygennitrogen copper

6. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element More work on symbols Fill in the gaps in the table below. Sodium Bromine Ag C Chlorine Symbol Name of element Cl Carbon Silver Br Na

7. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element How are the elements arranged? Answer: Using the Periodic Table Vertical columns are called ___________ and horizontal rows are called ___________. groups periods

8. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Elements, mixtures and compounds Elements – these are substances containing only ______________. For example, sodium is an element and is made up of sodium atoms only. Compounds – these are substances made up of two or more types of atom. These atoms are joined together chemically. For example, carbon dioxide contains carbon and oxygen atoms joined together by chemical bonds. one type of atom

9. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Mixtures – these are not pure substances. The compounds and/or elements making them up are not joined chemically. For example, air is a mixture of gases like oxygen (an element) and carbon dioxide (a compound).

10. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Elements, mixtures and compounds, continued Classify the following substances as elements, mixtures or compounds. mixturecompoundelement

11. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Describe how elements contain only one type of atom Understand that symbols are used for atoms to show what happens in chemical reactions. Know that all 100 known elements are listed on the periodic table and groups have similar properties

12. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Key words; Atom, Compound, Electron, Element, Symbol

13. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Understand that symbols are used for atoms to show what happens in chemical reactions. Know that atoms bond and rearrange in a chemical reaction

14. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element A compound is made when atoms of different elements react and join together. For example, water is produced from the chemical reaction between hydrogen and oxygen. Two hydrogen molecules react with one oxygen molecule to produce two molecules of water. + H H H H O O hydrogenoxygenwater + Why does water have different properties to its elements?

15. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element A compound has different properties to the elements from which it is made because the atoms are joined differently. Black solid used as fuel. Colourless gas in which many substances burn. Colourless gas used in fizzy drinks and fire extinguishers. + + OOC carbonoxygencarbon dioxide +

16. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element A compound is not a mixture The atoms in water, the compound made when hydrogen and oxygen react and their atoms become chemically joined to each other, look like this… The atoms in a mixture of hydrogen gas and oxygen gas, which have not reacted with each other, look like this…

17. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element To name simple compounds of metals and non-metals: 2. Write down the name of the non-metal, changing the ending of the word to “-ide”. 1. Write down the name of the metal. What is the name of the compound made when the following elements combine? magnesium and oxygen sodium and chlorine oxygen and iron magnesium oxide sodium chloride iron oxide

18. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element How do we name compounds? The rules are: 1. If there are two elements present, then the name ends in –IDE. For example, the formula CuS represents the compound _________ide. 2. If there are three elements present and the third one is oxygen, then the name ends in –ATE. For example, the formula CuSO 4 represents _________ate. coppersulf coppersulf

19. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element What is the name of each compound formed by these metal and non-metal elements? nitrogenlithium sulphurzinc iodinenickel brominealuminium oxygentin chlorinesodium nitrogenmagnesium sulphuriron Name of compoundElement 2Element 1 iron sulphide magnesium nitride sodium chloride tin oxide aluminium bromide nickel iodide zinc sulphide lithium nitride

20. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Many compounds contain more than two elements. oxygenbrominealuminium oxygensulphurcopper oxygen Element 3 nitrogensodium magnesium nitratenitrogenmagnesium nickel sulphatesulphurnickel Name of compoundElement 2Element 1 sodium nitrate copper sulphate aluminium bromate For compounds containing two elements plus oxygen, - the ending of the other non-metal usually changes to “-ate”.

21. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Naming compounds, continued Name the compounds in the table below. FormulaName AlCl 3 CuO Fe 2 O 3 CaSO 4 CaCO 3 MgBr 2 NaNO 3 Aluminium chloride Copper oxide Iron oxide Calcium sulfate Calcium carbonate Magnesium bromide Sodium nitrate

22. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element A compound always contains a particular amount of each element. It has a fixed composition. Composition of compounds A compound contains atoms from different elements that are chemically joined together. Compound names can get quite long and complicated, so the symbols of the elements are used as a shorthand. The symbols of the elements in a compound are combined to give the formula of the compound. What is the formula of carbon dioxide?

23. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element carbon dioxide A formula uses the symbols of the elements in a compound. When there is more than one atom of each element, the number is always written after the symbol. carbon atom = 1 formula = hydrogen atoms = 2 formula = The formula shows the ratio of atoms in a compound. water CO 2 H2OH2O oxygen atoms = 2 oxygen atom = 1

24. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element 1. Titanium oxide For every titanium atom there are two oxygen atoms. Formula = 2. Lithium oxide For every two lithium atoms there is one oxygen atom. Formula = 3. Aluminium chloride For every aluminium atom there are three chlorine atoms. Formula = What is the formula of each of these compounds? TiO 2 Li 2 O AlCl 3 (In a formula put the metal first as when naming a compound.)

25. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element 1. Silicon chloride For every silicon atom there are four chlorine atoms. Formula = 2. Manganese oxide For every manganese atom there are two oxygen atoms. Formula = 3. Aluminium oxide For every two aluminium atoms there are three oxygen atoms. Formula = What is the formula of each of these compounds? SiCl 4 MnO 2 Al 2 O 3 (In a formula put the metal first as when naming a compound.)

26. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element

27. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element

28. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Understand that symbols are used for atoms to show what happens in chemical reactions. Know that atoms bond and rearrange in a chemical reaction

29. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element

30. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Understand that symbols are used for atoms to show what happens in chemical reactions. Know that atoms bond and rearrange in a chemical reaction Work safely in the lab to make compounds from elements

31. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Chemical reactions The substances that react are called the REACTANTS. The substances formed are called the PRODUCTS. To represent chemical reactions we write word equations or symbol equations. REACTANTSPRODUCTS

32. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element A word equation can be used to describe any chemical reaction, i.e. any process in which atoms become joined in different ways. The steps for writing a word equation are: 1. On the right-handside, put the name of the reactant(s). + If there are two or more reactants, link them with a + sign. 2. In the middle, write down an arrow (  ). 3. On the right-handside, put the name of the product(s). + If there are two or more products, link them with a + sign.

33. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element The lead and oxygen don’t mix, they react to form lead oxide. This means that the lead and oxygen atoms in the product are joined differently to the atoms in the reactants. Lead reacts with oxygen to form lead oxide. lead + oxygen  lead oxide Why is lead oxide so different to both lead and oxygen? What is the word equation for this reaction?

34. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Chemical reactions, continued Write word equations for the following reactions 1 When sodium is burned in oxygen, sodium oxide is formed. sodium(s)+ oxygen(g)sodium oxide(s) 2 When solid calcium carbonate is heated, it decomposes into solid calcium oxide and carbon dioxide gas. Calcium carbonate(s) calcium oxide(s) heat carbon dioxide(g) +

35. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element 1. Limestone (calcium carbonate) is heated to make calcium oxide and carbon dioxide. 2. Magnesium reacts with hydrochloric acid to make magnesium chloride and hydrogen. 3. Methane is burnt to make carbon dioxide and water. calcium carbonate  calcium oxide +carbon dioxide magnesium + hydrochloric acid  magnesium chloride + hydrogen methane + oxygen  carbon dioxide + water Write out word equations for the following chemical reactions.

36. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Investigation: For each of the following; Burn magnesium Pour hydrochloric acid over magnesium Pour sulphuric acid over zinc 1.Complete the experiment & write an observation Write a word equation Write a symbol equation Balance the equation Describe the ratio of atoms in the compound composition of the products

37. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element 1) When calcium carbonate burns it turns…..(complete the experiment & write an observation) calcium carbonate  calcium oxide +carbon dioxide 2) complete the word equation 3) CaCO 3(s) CaO (s) + CO 2(g) complete the symbol equation 4)1 Ca1 Ca 1 C1 C 3 O3 O balance the equation 5) 1 Calcium atom to every 1 oxygen atom AND 1 carbon atom to every 2 oxygen atoms. describe the ratio of atoms in the compound composition of the products 6) complete diagrams of at least one of the equations

38. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Does the mass change during a chemical reaction? The answer to this is ___. NO For example, when 56 g of iron reacts with 32 g of sulfur iron sulfide is formed. The mass of the iron sulfide formed is __ g. 88 When 48 g of magnesium is heated in oxygen, 80 g of magnesium oxide is formed. What mass of oxygen is needed to react with the magnesium? The answer is __ g.32

39. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Burning fossil fuels The three fossil fuels are: Coal,oiland natural gas. When the fossil fuels are burned in enough air they always form water and carbon dioxide. Carbon dioxide is a __________ gas and is linked to g____ w______. greenhouse lobal arming Write the word equation for methane (natural gas) burning in oxygen. methane(g) + oxygen(g) carbon dioxide(g) + water(l)

40. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element The Reactivity Series Metals are arranged in order of how reactive they are. A more reactive metal will displace a less reactive one from its compounds. For example, zinc will displace copper from copper sulfate to give zinc sulfate plus copper. The word equation is: zinc(s) + copper sulfate(aq) zinc sulfate(aq) + copper

41. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element Learning Objectives By the end of the lesson I can: Understand that symbols are used for atoms to show what happens in chemical reactions. Know that atoms bond and rearrange in a chemical reaction Work safely in the lab to make compounds from elements

42. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element

43. 1 of 20 GCSE Core Chemistry Exam tip; A symbol represents 1 atom of an element