1) What is chemical analysis? a) The process of purifying chemicals b) The process of identifying chemical reactions c) The process of establishing what chemicals are present in a substance d) The process of measuring the concentration of chemicals 2) In everyday language what is a "pure" substance? a) A substance that has had nothing added to it and is in its "natural" state b) A substance that is transparent and odorless c) A substance that is commonly found in nature d) A substance that is safe to consume 3) In chemistry what is a "pure" substance? a) A substance made of a single element or compound b) A substance that is highly reactive c) A substance that is chemically unstable d) A substance that is not contaminated by impurities 4) How can pure substances be distinguished from impure ones? a) By their color and odor b) By their density and volume c) By their melting and boiling points d) By their physical appearance 5) Describe the melting and boiling points of pure substances a) One very specific temperature b) They change state at a range of temperatures c) They remain constant regardless of impurities d) They vary depending on the method of heating 6) Describe the melting and boiling points of impure substances a) They change state at a range of temperatures b) One very specific temperature c) They remain constant regardless of impurities d) They vary depending on the method of heating 7) What is a formulation? a) A simple mixture of substances b) A substance made of a single element c) A complex mixture designed as a useful product d) A substance used for scientific experiments 8) Give three examples of formulations a) Fuels, cleaning agents, and paints b) Alloys, fertilizers, and foods c) Medicines, paints, and alloys d) Cleaning agents, foods, and medicines 9) What is chromatography? a) A process to mix chemicals together b) A process to separate the constituents of a mixture c) A process to measure the density of a substance d) A process to determine the pH of a solution 10) In paper chromatography, what is the stationary phase and what is the mobile phase a) Paper is stationary, and the solvent (usually water or ethanol) is mobile b) Paper is mobile, and the solvent is stationary c) Both paper and solvent are stationary d) Both paper and solvent are mobile 11) How can chromatography show the difference between pure and impure substances? a) Pure ones will not separate into a number of spots b) Pure ones will separate into a number of spots c) Impure ones will not separate into a number of spots d) Impure ones will separate into a number of spots 12) How is the Rf value calculated? a) Distance moved by the spot/distance moved by the solvent b) Distance moved by the solvent/distance moved by the spot c) Distance moved by the spot x distance moved by the solvent d) Distance moved by the solvent x distance moved by the spot 13) What does a substance's Rf value depend on? a) How soluble it is in the solvent b) Its density and volume c) Its color and odor d) Its molecular weight 14) In chromatography, why must the substances be placed on a pencil line? a) Pencil will not dissolve in the solvent b) Pencil will enhance the separation of spots c) Pencil will make the spots more visible d) Pencil will prevent the spots from spreading 15) In chromatography why must the solvent height be lower than the pencil line? a) So that the substances can dissolve completely in the solvent b) So that the spots do not overlap with each other c) So that the spots can be easily identified d) So that the substances do not dissolve into the solvent off the paper 16) How can oxygen be tested for? a) Bubbling it through limewater, which turns it milky (cloudy)  b) Relights a glowing splintProduces a pungent odor c) Forms bubbles when mixed with water d) Changes the color of an indicator solution 17) How can carbon dioxide be tested for? a) Bubbling it through limewater, which turns it milky (cloudy) b) Produces a pungent odor c) Forms bubbles when mixed with water d) Changes the color of an indicator solution 18) How can chlorine be tested for? a) Bleaches damp litmus paper white b) Forms bubbles when mixed with water c) Produces a pungent odor d) Changes the color of an indicator solution 19) What is a flame test? a) A test to determine the heat resistance of a substance b) A test to identify metal ions c) A test to identify the presence of organic compounds d) A test to measure the pH of a solution 20) What is the colour of the flame produced from a lithium containing compound? a) Green b) Yellow c) Lilac d) Crimson 21) What is the colour of the flame produced from a copper containing compound? a) Crimson b) Yellow c) Green d) Lilac 22) What is the colour of the flame produced from a sodium containing compound? a) Yellow b) Crimson c) Green d) Lilac 23) What is the colour of the flame produced from a potassium containing compound? a) Crimson b) Green c) Lilac d) Yellow 24) What is the colour of the flame produced from a calcium containing compound? a) Green b) Yellow c) Orange-red d) Crimson 25) Other than flame tests, how can metal ions be identified? a) Use of sodium hydroxide b) Use of an acid-base indicator c) Use of a pH meter d) Use of a conductivity tester 26) Which solutions produce white precipitates on addition of sodium hydroxide? a) Solutions containing sodium, potassium, and lithium ions b) Solutions containing copper, iron, and zinc ions c) Solutions containing aluminium, magnesium, and calcium ions d) Solutions containing chloride, bromide, and iodide ions 27) How can a solution of aluminium ions be distinguished from calcium and magnesium ones? a) Its precipitate will dissolve in excess sodium hydroxide  b) Its precipitate will remain unchanged in excess sodium hydroxide c) Its precipitate will turn black in excess sodium hydroxide d) Its precipitate will turn yellow in excess sodium hydroxide 28) What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing copper (II) ions? a) Green b) Brown c) Blue d) White 29) What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing iron(II) ions? a) Green b) Blue c) Brown d) White 30) What is the colour of the precipitate formed from the addition of sodium hydroxide to a solution containing iron(III) ions? a) Brown b) Blue c) Green d) White 31) What is the test for carbonates? a) Heating the substance to observe its melting point b) Mixing the substance with water and observing its solubility c) Adding an acid to generate carbon dioxide gas d) Measuring the pH of the substance 32) What is the test for halides? a) Adding silver nitrate and nitric acid to generate a solid silver halide precipitate b) Heating the substance to observe its color change c) Mixing the substance with water and observing its solubility d) Measuring the conductivity of the substance 33) What are the colours of the silver halides? a) Silver chloride is white, silver bromide is cream, silver iodide is yellow b) Silver chloride is yellow, silver bromide is cream, silver iodide is white c) Silver chloride is cream, silver bromide is white, silver iodide is yellow d) Silver chloride is white, silver bromide is yellow, silver iodide is cream 34) What is the test for sulfate ions? a) Heating the substance to observe its colour change b) Adding barium chloride and hydrochloric acid, which forms a white precipitate c) Measuring the conductivity of the substance d) Mixing the substance with water and observing its solubility 35) What is an instrumental method? a) The use of scientific technology to perform chemical analysis b) The use of traditional laboratory techniques for chemical analysis c) The use of visual observations to determine chemical properties d) The use of chemical equations to predict reactions 36) What are the three advantages of instrumental methods? a) They are inexpensive, widely available, and easy to perform b) They are qualitative, versatile, and non-destructive c) They are accurate (give correct results), sensitive (only needs a small sample to work), rapid (a lot faster than other tests) d) They are quantitative, precise, and reliable 37) What is flame emission spectroscopy? a) An instrumental analysis tool for identifying metal ions b) A technique for measuring the intensity of a flame c) A method for generating heat from a flame d) A process for studying the combustion of substances 38) How is flame emissions spectroscopy carried out? a) The sample is heated to a high temperature and observed for color changes b) The sample is placed in a flame, and the light emitted is passed through a spectroscope to give a spectrum that can be compared to a reference c) he sample is dissolved in a liquid and analyzed using a colorimeter d) The sample is mixed with a reagent and observed for the formation of a precipitate

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