review 8.6E Conservation of Mass

Scientists use the periodic table to organize important information about ​ (a)   . When a subscript follows a group of atoms in parentheses, the subscript applies to ​ (b)   atom in the group. Mass is a measure of how much ​ (c)   is in a system. During any ordinary chemical or physical change, the total mass of the substances involved ​ (d)   after the change. New substances formed during a chemical reaction are made up of ​ (e)   atoms as the atoms of the substances that reacted.

• elements
• every
• stays the same
• the same
• matter
• different

Answer explanation

Scientists use the periodic table to organize important information about elements. Subscripts apply to every atom in the group. Mass is a measure of how much matter is in a system. During any ordinary chemical or physical change, the total mass of the substances involved stays the same. New substances formed during a chemical reaction are made up of the same atoms as the atoms of the substances that reacted.

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What happens to the mass of water when it turns into steam?

• It increases

• It remains the same

• It decreases

• It disappears

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Why does the mass of water not change when it becomes steam?

• Because steam is lighter than water

• Because the total amount of matter is conserved

• Because the water molecules are destroyed

• Because steam takes up more space

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Why do we balance chemical equations?

• To make them easier to solve

• To make them look symmetrical

• To reduce the number of chemicals used

• To follow the law of conservation of matter

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What happens to the atoms during a chemical reaction?

• Atoms become invisible

• The number of atoms remains the same

• Atoms are created

• Atoms are destroyed

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What is the significance of balancing equations in chemistry?

• To identify the reactants and products

• To determine the speed of the reaction

• To make them simpler

• To ensure that matter is conserved

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What is the result of the rusting process on a copper pipe?

• The pipe loses mass

• The pipe's mass remains unchanged

• The pipe gains mass

• The pipe becomes lighter in color

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What demonstrates the law of conservation of matter during the rusting of a copper pipe?

• The bonding of oxygen atoms to the copper

• The evaporation of water

• The transformation of copper into oxygen

• The disappearance of copper atoms

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What proves that air has mass?

• The ability to breathe it

• Its color

• Its visibility under certain conditions

• The rusting of a copper pipe

How does the law of conservation of matter apply to eating food?

• Food disappears once consumed

• Food mass is conserved through bodily processes

• Food is completely converted into waste

• Food mass increases after eating

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