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Flashcards: Model the law of conservation of mass using equations

According to the law of conservation of mass, if you start a chemical reaction with 50g of a substance, and 25g of another, you should end the reaction with: (assume this is a closed system)

25 grams of the one substance and 50 grams of the other substance

more than 75 grams of whatever new substances are created because some mass will be created in the reaction

less than 75 grams of whatever new substances are created because some mass will be lost in the reaction

75 grams of whatever new substances are created

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Flashcards: Model the law of conservation of mass using equations

According to the law of conservation of mass, if you start a chemical reaction with 50g of a substance, and 25g of another, you should end the reaction with: (assume this is a closed system)

Your answer:

25 grams of the one substance and 50 grams of the other substance

Your answer:

more than 75 grams of whatever new substances are created because some mass will be created in the reaction

Your answer:

less than 75 grams of whatever new substances are created because some mass will be lost in the reaction

Correct answer:

75 grams of whatever new substances are created

Explanation:

The answer is "75 grams of whatever new substances are created."

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. Thus, the amount of matter cannot change.

Because mass is always conserved in chemical reactions, balanced chemical equations have the same number and type of each atom on both sides of the equation. Products in chemical reactions are the result of the same number of atoms being rearranged into new substances.

The law of conservation of mass only applies in “closed systems” meaning that the mass and energy is not able to escape to the environment. For example, if you are boiling water on the stove and you put a lid on your pot, the water vapor will collect inside the pot. This is a closed system, and the amount of mass will not change, though it will be converted from liquid to gas. If you take the lid off your pot, the evaporated water will escape into your kitchen and the total amount of matter will change. You opened your system!

Flashcards: Model the law of conservation of mass using equations

In the chemical equation for Carbonic Acid, you begin with the reactants carbon dioxide and water. (CO₂ + H₂O) How many atoms of Oxygen would you expect to find in the symbol for carbonic acid?

2 atoms of oxygen

1 atom of oxygen

3 atoms of oxygen

no atoms of oxygen

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Flashcards: Model the law of conservation of mass using equations

In the chemical equation for Carbonic Acid, you begin with the reactants carbon dioxide and water. (CO₂ + H₂O) How many atoms of Oxygen would you expect to find in the symbol for carbonic acid?

Your answer:

2 atoms of oxygen

Your answer:

1 atom of oxygen

Your answer:

no atoms of oxygen

Correct answer:

3 atoms of oxygen

Explanation:

The answer is "3 atoms of Oxygen."

The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. Thus, the amount of matter cannot change.

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All Middle School Physical Science Resources

Flashcards: Model the law of conservation of mass using equations

Flashcards: Model the law of conservation of mass using equations

Flashcards: Model the law of conservation of mass using equations

Flashcards: Model the law of conservation of mass using equations

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