1 Which of these is the smallest particle? An atom A molecule A speck of dust 2 Which of these is the correct symbol for magnesium? MG mg Mg 3Which statement about atoms and molecules is correct? Elements always exist as separate atoms Elements always exist as pairs of atoms called molecules Elements and compounds can exist as molecules 4How many different atoms are there in a compound? One Always two Two or more 5Approximately how many elements are there? 100 4 1,000,000 6Which one is a compound? Water Hydrogen Helium 7Which of these contains two carbon atoms and six hydrogen atoms? CH4 C2H6 C2H4 8Which of these contains four hydrogen atoms? CH3OH H2O H2O2 9How many atoms are there in total in a molecule of sulfur trioxide, SO3? Two Three Four 10Why does air not have a definite formula? It contains different amounts of water depending on where you are It depends on the temperature It is not a compound 1Which statement about elements is correct? Most elements are metals Most elements are non-metals There are about the same number of metals and non-metals 2Where are the metals found in the periodic table? On the left On the right Scattered all over 3Which of the following is a general property of non-metals? Shiny Good conductor of heat Poor conductor of electricity 4Which of the following is a general property of metals? Brittle Strong Poor conductor of heat 5An element sinks in water and makes a ringing sound when hit. It is most likely to be: A metal A non-metal An alloy 6Which of these is an element in group 2? Sodium Aluminium Calcium 7Which element from this list will be most similar to neon? Zinc Argon Fluorine 8Who developed the modern periodic table? Isaac Newton Dmitri Mendeleev Gregor Mendel 9What is produced when magnesium burns in air? Magnesium oxide Magnesium hydroxide Magnesium carbonate 10What term can be used to describe non-metal oxides? Acids Alkalis Bases 1Which is the best way to get salt from salty water? Evaporation Filtration Distillation 2Pure water can be separated from inky water by simple distillation because: Water and ink have different boiling points Water evaporates leaving the ink particles behind Ink evaporates leaving the water behind 3What is the correct order for obtaining salt from a mixture of sand and salt? Dissolving in water - filtration - evaporation Evaporation - filtration - dissolving in water Filtration - dissolving in water - evaporation 4Which method is usually used to separate coloured substances from each other? Simple distillation Evaporation Chromatography 5How could you separate iron filings from a mixture of iron and sulfur? Using a magnet By adding water and filtering By distillation 6In filtration, what name is used to describe the solid left in the filter paper? Filtrate Residue Distillate 7If you wanted to make pure drinking water from sea water, what process would you use? Filtration Distillation Evaporation 8Crude oil can be separated into several liquids that have different boiling points. What is the name of this process? Simple distillation Chromatography Fractional distillation 9In chromatography, where are the spots of coloured substances placed? Randomly on the piece of paper In a vertical line on the paper On a horizontal line on the paper 10What is the name of the piece of paper at the end of a chromatography experiment? Chromatogram Filtrate Residue