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chemistry revision

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  • A saturated solution is one in which: (1 mark) A. No more solute can dissolve at a given temperature. B. More solute can always be added. C. The solute and solvent separate completely. D. The solute is removed by filtration.
    No more solute can dissolve at a given temperature.
  • true or false and fix the false : You cannot change the amounts of substances in a mixture.
    false,you can change
  • When salt dissolves in water, a ------- forms.
    solution
  • Which of the following statements is false? (1 mark) A. A pure substance has a fixed melting point. B. Solubility of a substance can change with temperature. C. A saturated solution can dissolve more solute.
    A saturated solution can dissolve more solute.
  • m heats a sample. He plots the temperature every minute. Use the graphs to decide whether the sample is a pure substance or a mixture of substances. Explain your decision. (2 marks)
    its temperature stays the same until all the solid has melted,This shows that the sample is pure
  • Explain why Seawater is considered a mixture.
    it contains multiple substances that are not chemically bonded together. It is composed of water (H₂O), dissolved salts (such as sodium chloride), gases (like
  • The formula of carbon dioxide is CO₂. There are ____ atoms of carbon for every two atoms of ____.
    one-oxygen
  • Each sphere represents one atom. Different-colored spheres represent atoms of different elements. , State whether sulfur dioxide is an element or a compound. Explain your decision.
    compound because it is made up of more than one type of element chemically bonded together.
  • give the name of the process and state where the named substance would be at the end of the process : Sand from a mixture of sand and water
    Process: Filtration Where is the substance? The sand remains as residue on the filter paper, while the water passes through as filtrate.
  • give the name of the process and state where the named substance would be at the end of the process : Salt from a solution of salt in water
    Process: Evaporation ( Where is the substance? The water evaporates, leaving the salt behind as solid crystals.
  • True or false and fix the false\:A mixture is made up of different substances that are chemically joined together.
    false , not chemically bonded
  • Salt is the solute, and water is the ------
    solvent.
  • What is the correct definition of a solution? (1 mark) A. A chemically bonded substance. B. A mixture of a liquid with a solid or gas where the components remain separate. C. A mixture of a liquid with a solid or gas where the components ar
    A mixture of a liquid with a solid or gas where the components are evenly distributed.