Laws of Conservation

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products

• a total of 75g of products

• a total of 180 g of products

• None of the above

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NGSS.MS-PS1-5

How can the adherence to the law of conservation of mass in living systems be demonstrated through the following observations?

• The total mass of a dead organism equals the total mass of matter released to the environment by decomposition.

• Most plants and animals begin their life cycle with a smaller mass and gain mass during development.

• The total mass of all organisms in an ecosystem remains the same over time.

• Living animals must consume food with a mass much greater than the mass of their body over their lifetime.

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NGSS.MS-LS2-3

NGSS.MS-PS1-5

In Evan's study of energy transfer within an ecosystem, he analyzes a diagram illustrating the flow of energy from the sun through a simple food chain. Based on his observations, which aspect of the diagram supports the principle of the conservation of energy?

• The total amount of energy decreases within the system.

• The total amount of matter remains the same within the system.

• The total amount of energy remains the same within the system.

• The total amount of energy increase within the system.

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NGSS.MS-PS3-5

Within the depicted diagram illustrating the flow of carbon and nitrogen in a man-made mussel bed in the ocean, what evidence could substantiate the adherence to the law of conservation of mass in this ecosystem?

• The amount of carbon and nitrogen removed during harvest equals the amount seeded as biomass.

• Carbon and nitrogen enter and leave the ecosystem only through man-made processes.

• The mass of scavengers, decomposers, and feces equals the mass absorbed from phytoplankton and detritus.

• The total amount of carbon and nitrogen entering the ecosystem equals the total amount leaving the ecosystem.

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NGSS.MS-LS2-3

In accordance with the law of conservation of energy, which piece of evidence demonstrates that energy in all living systems cannot be created or destroyed but only undergoes transformations or transfers?

• Most plants and animals begin their life cycle with small energy needs and gain more requirements as they develop.

• Decomposers transfer energy stored in the molecules of the dead organism to create new biomass for other organisms to feed on.

• The total energy of all organisms is an ecosystem remains the same over time.

• The total mass of dead organism equals the total mass of matter released to the environment by decomposition.

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NGSS.MS-LS1-7

NGSS.MS-LS2-3

This evidence, where the quantity of each element in the reactants of photosynthesis matches the quantity in the products of the same reaction, aligns with the principles of which scientific law?

• 
  Law of conservation of mass

• Law of motion

• Law of conservation of energy

• Law of thermodynamics

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NGSS.MS-PS1-5

In Joel's terrarium, a sealed container containing both plants and animals, the consistent weight reading of 1525.3 grams on the balance provides evidence that most strongly aligns with which law governing living systems?

• Law of thermodynamics

• Law of conservation of energy

• Law of motion

• Law of conservation of mass

Tags

NGSS.MS-PS1-5

In the scenario where animals consuming plants obtain energy, utilizing it for activities like movement, but only a fraction is converted into useful energy, with the majority being lost as heat, how can this circumstance be employed to bolster the concept of the law of conservation of energy?

• The amount of energy used by the animals, added to the amount of energy lost to heat, equals the amount of energy from the plants eaten by the animal.

• While some animals get their energy from plants, there are also many animals that get energy by eating other animals, and still other animals that eat both.

• All the energy lost to heat by animals provides the heat energy that plants need to live and grow, allowing them to make their own food.

• When plants and animals die, their energy goes into the soil, where growing plants can absorb it, turn it into food, then transfer this energy to animals.

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NGSS.MS-LS2-3

NGSS.MS-PS3-5

How do plants adhere to the law of conservation of mass in the process of photosynthesis, where they absorb carbon dioxide, water, and solar energy to generate carbohydrates and oxygen?

• The amount of each element in the reactants equals the amount of each element in the products.

• The number of carbon dioxide molecules taken in exactly equals the number of carbohydrate molecules produced.

• The plant uses the carbon dioxide gas, liquid water, and energy to produce a solid carbohydrate.

• The plant's mass does not increase or decrease as a result of photosynthesis.

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NGSS.MS-LS1-6

NGSS.MS-PS1-5

In an energy pyramid depicting the flow of energy through an ecosystem, with each level receiving only approximately 10% of the energy from the preceding level, if living systems adhere to the law of conservation of energy, where is the remaining 90% of the energy expected to be directed?

• It is used by decomposers during decomposition.

• It is converted into heat and energy for all life functions.

• It is converted into matter during digestion.

• It is used by organisms in the lower trophic level.