Mrs. R is demonstrating a chemical change for her class. She places 15 grams of baking soda into a beaker. Next she adds 15 grams of vinegar to the same beaker. When the two compounds make contact, they bubble and fizz a great deal. She places the beaker on the balance and notes that the mass of the solution in the beaker is less than the expected 30 grams. If the Law of conservation of mass holds true for this reaction, why is the mass of the solution in the beaker less than 30 grams?

The gas that was released changed the mass.

The balance was not working correctly.

Mass is always lost in a chemical reaction

The new products have less mass than the original reactants.

During science class, while studying mixtures, you mix together table sugar and dirt. Your teacher challenges you to separate the sugar from the dirt. What property could you use and how would you use it?

solubility; Add water to the mixture and dissolve the sugar

particle size; Pour the mixture through a paper filter to separate the two

color; Pick out one of the two solids by using color to guide you

density; The two will form two layers. Scoop out the top layer

During photosynthesis, sugar C 6 H 12 O 6 is produced from carbon dioxide, water, and sunlight. Which statement BEST explains what happens during photosynthesis? Energy + 6CO 2 + 6H 2 O → 6O 2 + C 6 H 12 O 6

Atoms of compounds are rearranged to form new compounds

Atoms are gained when sugar is formed

Single atoms are converted into molecules

Atoms from compounds are lost when sugar is formed

How are physical and chemical properties different?

Chemical properties are only observable as the substance is changing into something different. Physical properties are easily observed or measured.

Chemical properties only apply to chemicals. Physical properties apply to everything.

Chemical properties are easy to reverse, and physical properties cannot be reversed.

Changes in Matter

Quiz

•

Science

•

7th - 8th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-PS1-5, MS-PS1-2, MS-PS1-4

+4

Standards-aligned

S Sethunath

Used 43+ times

FREE Resource

25 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a change that forms a new substance?

Physical Change

Chemical Change

Phase Change

Relationship Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What are the substances that START a chemical reaction?

Products

Gases

Reactants

Solids

Tags

NGSS.MS-PS1-2

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Identify the correct statements about this picture.

It is a Physical change

It is a Chemical change

It is reversible change

Evidence of change in shape of the object

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

4.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Identify the correct statements about this picture.

Physical Change

Chemical Change

A new Substance is formed

It is not reversible

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is an example of a physical change?

mixing baking soda and vinegar causing bubbles to form

dissolving sugar into sweet tea

heating sugar until it turns black

letting milk spoil, forming a solid from a liquid

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Butter is melted in a pan. Which of the following is true about the change?

It is a physical change that absorbs energy

It is a physical change that releases energy

It is a chemical change that absorbs energy

It is a chemical change for which there is no change in energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is not a chemical change?

food coloring dissolving in water

leaves turning color

fruit ripening

silver tarnishing

Tags

NGSS.MS-PS1-2

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Changes in Matter

25 questions

What is a change that forms a new substance?

What are the substances that START a chemical reaction?

Identify the correct statements about this picture.

Identify the correct statements about this picture.

Which of the following is an example of a physical change?

Butter is melted in a pan. Which of the following is true about the change?

Which of the following is not a chemical change?

Physical or chemical change?

Does this follow the law of conservation of mass?

To activate a glowstick you have to bend it which cracks an internal container, then shake it. The activated glowstick glows very bright. What sort of change is this?

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