Conservation of Matter and Energy

What would happen to the bird if the green fish died out?

• the bird population would grow

• the bird population would die out

• the smaller fish will die out

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Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy (90%) some is used for the organism’s _________, Check all that apply.

• heat

• Gaining mass/

• growth

• movement

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Living systems obey the law of conservation of mass. Which of the following statements supports the main ideas of the law of conservation of mass?

• The substances that take part in a chemical reaction are the same as the substances that are formed by the reaction.

• The masses of the substances that take part in a chemical reaction are less than the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are equal to the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are greater than the masses of the substances formed by the reaction.

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What is the Law of Conservation of mass?

• Mass is created in a chemical reaction

• Mass is created in a physical change

• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

• Mass is never created or destroyed

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What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same

• The product always weighs more than the reactant

• The reactant will weigh more than the product

• They both will loose mass after the reaction

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a different way to say Law of Conservation of Matter

• Law of Conservation of Volume

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Conservation of Environment

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fundamental principle that matter cannot be created or destroyed in a closed system

• Law of Conservation of Energy

• Law of Conservation of Matter

• Law of Conservation of Environment

• Law of Conservation of Volume

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NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Energy?

• Energy can be created and destroyed.

• Energy can be transformed from one form to another, but cannot be created or destroyed.

• Energy is always lost in the form of heat.

• Energy is only conserved in closed systems.

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NGSS.MS-PS3-5

In a closed system, a chemical reaction occurs where the reactants weigh 50 grams. According to the Law of Conservation of Mass, what should be the weight of the products?

• 45 grams

• 50 grams

• 55 grams

• 60 grams

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Which of the following is an example of the Law of Conservation of Matter in a chemical reaction?

• Burning wood results in ash, smoke, and gases that weigh less than the original wood.

• Water evaporates and disappears completely.

• A sealed container with vinegar and baking soda shows no change in mass after the reaction.

• Ice melting into water increases the mass.

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