Which of the following best describes what happens to atoms during a chemical reaction?

They are rearranged to form new substances

Given the chemical equation for photosynthesis: $$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$$ , explain how mass is conserved in this reaction.

The number of atoms of each element is the same on both sides of the equation

The number of molecules is doubled

The mass increases on the product side

The mass decreases on the reactant side

A student mixes two clear liquids and observes the formation of a solid. What evidence supports that a chemical change has occurred?

The temperature remains the same

A student burns a piece of paper and notices that the mass of the ashes is less than the original paper. Using the law of conservation of mass, explain what happened to the missing mass.

The mass was converted to gases that escaped into the air

The mass was absorbed by the paper

Given the reaction $$2Na + Cl_2 \rightarrow 2NaCl$$ , identify the atoms involved in the reaction and explain how they are rearranged.

Sodium and chlorine atoms combine to form sodium chloride

Sodium and oxygen atoms combine to form sodium oxide

Sodium and chlorine atoms disappear

Only sodium atoms are present in the product

A student observes that when salt is dissolved in water, the salt can be recovered by evaporating the water. What type of change is this and why?

Physical change, because the process is reversible and no new substance is formed

Chemical change, because a new substance is formed

Physical change, because a gas is produced

Chemical change, because the salt disappears

Explain why the total mass of reactants and products must be equal in a chemical reaction, using the concept of atoms.

Atoms are not created or destroyed, only rearranged

Atoms are created during the reaction

Atoms are destroyed during the reaction

A student observes that when baking soda is heated, it produces a gas and leaves a solid residue. Explain whether this is a physical or chemical change and justify your answer.

Chemical change, because a new substance (gas) is formed

Physical change, because the solid remains

Physical change, because the gas is invisible

Chemical change, because the temperature increases

The red numbers in the image below represent ________

I don't know, and don't want to try

None of the answers are correct

The blue numbers in the image below represent ________

I don't know, and don't want to try

none of the answers are correct

1st 6 weeks review (8th grade)

Authored by Riley Nelson

Science

7th Grade

NGSS covered

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37 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The number of oxygen atoms

The number of hydrogen atoms

The number of molecules

The number of electrons

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element is represented by the symbol "Na" on the periodic table?

Nitrogen

Sodium

Neon

Nickel

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a chemical change?

Melting ice

Burning wood

Breaking glass

Dissolving sugar in water

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which process is an example of a physical change?

Rusting of iron

Boiling water

Baking a cake

Digesting food

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes the law of conservation of mass?

Mass can be created in a chemical reaction

Mass is destroyed during chemical changes

Mass is neither created nor destroyed in a chemical reaction

Mass always increases in a chemical reaction

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element is involved in the chemical reaction of photosynthesis?

Helium

Carbon

Sodium

Iron

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

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1st 6 weeks review (8th grade)

Which element is represented by the symbol "Na" on the periodic table?

Which of the following is a chemical change?

Which process is an example of a physical change?

Which of the following best describes the law of conservation of mass?

Which element is involved in the chemical reaction of photosynthesis?

What is the chemical symbol for oxygen?

Which of the following is a sign of a chemical change?

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