1) What is meant by the term element? a) A substance made up of more than one type of atom. b) A substance made up of only one type of atom. c) A substance containing different elements not chemically combined d) A substance made up of many different types of atoms 2) Which one of the following elements is NOT a metal? a) Nitrogen b) Nickel c) Mercury d) Sodium 3) How many atoms are there in a molecule of methane (CH4)? a) 2 b) 3 c) 4 d) 5 4) How many elements are there in a molecule of CO2? a) 1 b) 2 c) 3 d) 4 5) Water is a compound made up of two different elements. These elements are: a) Sodium and chlorine b) Hydrogen and nitrogen c) Oxygen and iron d) Hydrogen and oxygen 6) Elements are often divided into two sub-groups. What are these two sub-groups A and B? a) Solids and liquids b) Metals and non-metals c) Liquids and gases d) Compounds and mixtures 7) One of these is not a compound. Which one is it? a) b) c) d) 8) When iron filings and sulfur powder are mixed together at room temperature, which one of the following statements is correct? a) The sulfur may be separated from the mixture by dissolving it in water. b) The iron may be separated from the mixture by using a magnet c) A new compound called iron sulfide is formed. d) They cannot be separated from each other. 9) Which one of the following is not a molecule? a) Sodium (Na) b) Water (H2O) c) Hydrogen (H2) d) Sodium chloride (NaCl) 10) If a substance consists of more than one type of atom chemically combined, it is called: a) an element b) a molecule c) a compound d) a mixture 11) Which one of the following substances is not a mixture? a) Air b) Water c) Crude oil d) Orange juice 12) Which one of the following four statements is incorrect? a) All metals are solid at room temperature. b) The element Mercury is a liquid at room temperature. c) Water is not an element. d) Iron contains only one type of atom. 13) Which of the following is made up only of one type of atom? a) A crystal of table salt b) Aluminium foil c) Tomato ketchup d) A drop of water 14) Which one of the following substances is a compound? a) Oxygen b) Carbon c) Hydrogen d) Sodium fluoride

Grade 7 elements, compounds & mixtures

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