Iqwest Life Science

These are part of the nervous system

• heart, brain, skin

• brain, spinal cord, nerves

• nerves, liver and stomach

• brain, stomach and nerves

A student created a model to show what happens before and after a process. Does this model represent a chemical reaction. Choose all the answers that will create a CER.

• This model shows a chemical reaction because all of the atoms are rearranged to form something new.

• The model shows that 2 Mg plus 2 O formed a new substance could 2MgO.

• Since, the product is different then the reactant, I know a chemical reaction occurred.

• I know this is correct by looking at the model.

Tags

NGSS.MS-PS1-2

Which of the following is a chemical reaction?

• New atoms are formed when substances are mixed together

• A solid material melts and becomes a liquid

• Atoms of the reactants rearrange to form a new substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement is always true about conservation of matter?

• If a gas forms, the mass of a system decreases.

• The mass of a system does not change during a chemical reaction.

• If a solid forms, the mass of a system increases.

• The mass of a system changes when a substance changes from liquid to gas, but it does not change in a chemical reaction.

Tags

NGSS.MS-PS1-5

Seth learned in school that iron reacts with oxygen in the air to form iron oxide. The chemical equation is: Fe + O2 🡪 FeO2 Seth wanted to see if this would really happen, so he put 13 grams of tiny iron (Fe) pieces on the window sill outside his house. After two weeks, he saw that the iron no longer looked shiny. He checked the mass of the pieces and saw that it went from 13 to 21 grams. Seth’s friend said this shows that matter is not conserved. Do you agree or disagree with Seth’s friend? Select all the answers to make a CER.

• Seth's friend is wrong because matter is conserved and the iron went up because it is now a new substance.

• The Iron combined with oxygen and added 8 grams of oxygen in the chemical reaction causing the mass to go up.

• This chemical reaction occurred in an open system which is why the mass went up.

• Since, I know matter cannot be created or destroyed I can say that Seth's friend is wrong and that matter is conserved in this chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the model, how does the total mass compare to the total mass after two weeks? Write an explanation to support your answer.

• The mass will stay the same because matter is neither created or destroyed the atoms are just rearranged to form something new.

• The mass will change because it is in an open system.

• The mass will decrease because after time the oxygen will float away.

• The mass will stay the same because it is the same thing.

Tags

NGSS.MS-PS1-5

Your teacher gives you a clear liquid, a white powder, and a red powder. Design an experiment to find out which two substances when mixed together will produce a chemical reaction. Pick all the correct answers.

• Mix the 1/2 of the red powder with the 1/2 of the clear liquid and record what happens.

• Mix 1/2 of the white powder with the other 1/2 of the clear liquid record what happens.

• Mix the substances all together and see what happens.

• Mix the other half of the red powder with the white powder and record what has happened.

• Create a data table to record your observations and analyze your data.

Tags

NGSS.MS-PS1-2

Plants to what to grow?

• air, soil, nutrients, and water

• air, sunlight, nutrients, and water

• air, sunlight, soil, and water

• air, sunlight nutrients, soil

Tags

NGSS.4-LS1-1

NGSS.5-LS1-1

What is the job of the roots?

• take food and water from the soil and to anchor the plant in the ground

• carries food and water

• collect sunlight

• attract insects

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

What is the job of the stem?

• takes food and water from the soil

• carries food and water

• collects sunlight

• attracts insects

Tags

NGSS.MS-LS2-3