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Law of conservation of mass

Quiz by Malcolm Sanders

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17 questions
Show answers
  • Q1
    What does the law of conservation of mass state?
    Mass changes into energy.
    Mass is neither created nor destroyed in a chemical reaction.
    Mass is only conserved in physical changes.
    Mass can be created or destroyed.
    30s
  • Q2
    Which of the following is an example of the law of conservation of mass?
    A balloon inflates and loses mass.
    Burning wood produces ash and smoke, but the total mass remains the same.
    Adding salt to water increases the total mass.
    Water evaporates and disappears completely.
    30s
  • Q3
    When a sealed container with reactants is heated, what happens to the total mass inside the container?
    The total mass remains the same.
    The total mass increases.
    The total mass becomes unmeasurable.
    The total mass decreases.
    30s
  • Q4
    What happens to the mass of a candle as it burns?
    The mass turns into light.
    The mass is lost to the air.
    The mass is conserved; the total mass of the wax and oxygen equals the mass of the leftover wax and gases produced.
    The mass increases as it burns.
    30s
  • Q5
    Which statement best describes a chemical reaction in terms of mass?
    The mass of the products equals the mass of the reactants.
    The mass of the products is greater than the mass of the reactants.
    The mass of the products is less than the mass of the reactants.
    Mass is completely converted to energy.
    30s
  • Q6
    What would you expect to see if you weighed a container before and after a chemical reaction takes place inside it?
    The weight would become unpredictable.
    The weight would increase after the reaction.
    The weight would stay the same if the container is closed.
    The weight would decrease after the reaction.
    30s
  • Q7
    In a chemical change, what happens to the atoms involved?
    Atoms can change into different elements.
    The atoms are created from nothing.
    The atoms are destroyed during the reaction.
    The atoms are rearranged, but the total number of atoms remains the same.
    30s
  • Q8
    If you dissolve sugar in water, what happens to the mass of the solution?
    The mass decreases because sugar disappears.
    The mass fluctuates during the dissolving process.
    The mass increases due to evaporation.
    The mass of the solution is equal to the mass of the sugar plus the mass of the water.
    30s
  • Q9
    What occurs to the total mass when vinegar and baking soda react?
    The total mass increases due to gas formation.
    The total mass decreases after the reaction.
    Mass is lost as a gas escapes.
    The total mass before the reaction equals the total mass after the reaction.
    30s
  • Q10
    Which of the following scenarios demonstrates the law of conservation of mass?
    Evaporating water and collecting the vapor.
    Cutting a piece of metal into smaller pieces.
    Burning paper in an open space and measuring the ashes.
    Mixing baking soda with vinegar and capturing all products in a closed container.
    30s
  • Q11
    If 10 grams of reactants are mixed and reacted in a chemical reaction, what will be the mass of the products?
    20 grams
    15 grams
    10 grams
    5 grams
    30s
  • Q12
    What happens to the total mass of a substance when it undergoes a physical change, like melting ice into water?
    The total mass increases.
    The total mass cannot be measured.
    The total mass remains the same.
    The total mass decreases.
    30s
  • Q13
    In a closed container, you react 20 grams of hydrogen gas with 16 grams of oxygen gas. How much water mass is produced in total?
    20 grams
    36 grams
    16 grams
    4 grams
    30s
  • Q14
    When you burn a candle, what happens to the wax as it melts and turns into gas?
    The total mass of the candle wax and the gases released remains the same.
    The gases produced are heavier than the wax.
    Some mass is lost in the form of light.
    The wax disappears completely.
    30s
  • Q15
    If you mix 5 grams of baking soda with 10 grams of vinegar, what will be the total mass of the resulting mixture after the chemical reaction?
    5 grams
    15 grams
    20 grams
    10 grams
    30s

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