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

FULL Chemical Analysis Combined

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