Chemical Reactions and Conservation of Matter Quiz

During a chemical reaction in a closed container, a solid and a liquid are mixed and produce a gas. According to the law of conservation of mass, what should happen to the total mass measured before and after the reaction?

• The total mass will decrease because some mass is lost as gas.

• The total mass will increase because a gas is produced.

• The total mass will depend on the type of reactants used.

• The total mass will remain the same because the system is closed.

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Which observation best supports that a chemical change, rather than a physical change, has occurred during an experiment?

• The liquid evaporates when heated.

• The solid is crushed into a powder.

• The mixture produces a new color and releases heat.

• The substance changes from a solid to a liquid.

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Which of the following chemical equations demonstrates the law of conservation of mass?

• H₂ + O₂ → H₂O

• 2Na + Cl₂ → 2NaCl

• C + O₂ → CO

• Mg + O₂ → MgO

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NGSS.MS-PS1-5

A chemical equation for the reaction between calcium hydroxide Ca(OH)_2, and sulfuric acid, H₂SO₄, is shown. The masses of some of the reactants and products are given in grams.

According to the Law of Conservation of Mass, how many grams of sulfuric acid were used in this reaction?

Mathematical Equivalence

ON

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Examine the experiment shown, then fill in the blanks.

The experiment shows a ​ (a)   system.

The mass at the end of the experiment will be ​ (b)   the initial mass.

• closed
• open
• equal to
• less than
• greater than

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The Law of Conservation of Mass:

Mass is ​ (a)   in a chemical reaction.

• neither created nor destroyed
• created
• destroyed
• both created and destroyed

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The law of conservation of mass says the bonds between atoms are​ (a)   to form new substances with new properties.

• fused

• created

• destroyed

• broken and rearranged

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In a chemical reaction, P4O10 has a mass of 12g, and H3PO4 has a mass of 90g. According to the law of conservation of mass (matter cannot be created or destroyed), what is the mass of H2O? (a)  

• 78g
• 102
• 102g
• 90g
• 12g

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Andrea and Roberto are working together in a chemistry lab in Managua, Nicaragua. They need to find the correct proportion of substances to balance the following chemical equation, which is important for producing hydrogen sulfide used in local industries: (a)   H₂ + (b)   S --> (c)   H₂S.

• 1,1 --> 1

• 2,2 --> 2

• 1,2 --> 1

• 1,2 --> 2

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fireworks exploding ​ (a)  

• chemical change
• physical change

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