PS Unit 4 Self Check Quiz

Students were given Sample A, a solid, and made the following observations.

Label each observation to indicate what type of property is being tested.

Groups:

(a) Physical Property

,

(b) Chemical Property

• Sample A floated when dropped in water

• Sample A burned when held in a flame

• Sample A melted when heated to 52 ^oC

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NGSS.MS-PS1-4

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A science class did an experiment in which two substances were mixed. After 15 minutes, everything looked the same, but the students noticed an odor coming from the experiment. What does this likely indicate?

• A liquid was formed.

• A temperature change occurred.

• A chemical reaction occurred.

• A physical change occurred.

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Which of the following is the best evidence that a chemical change has taken place?

• The apple is smaller in size after cutting.

• The apple is turning brown.

• The apple has changed shape.

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Two metal samples are each placed in a beaker containing the same liquid. What evidence indicates that a chemical reaction is taking place in one of the beakers? Select all that apply. (3 Choices)

• A gas is being given off.

• There is a change in color.

• The liquid is clear and colorless.

• Bubbles are forming.

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NGSS.MS-PS1-2

Based on what you observe in the beakers, which statement is true?

• Chemical reactions can always be seen.

• The two samples of metal are different substances.

• Chemical reactions are unpredictable.

• New substances are formed in each beaker.

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NGSS.MS-PS1-2

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Which are physical properties that could be used to identify a substance? Select all that apply. (3 choices)

• density

• flammability

• color

• melting point

What is true about a chemical reaction? Select all that apply. (2 choices)

• Under the same conditions, reactants will form the same products.

• All of the atoms that make up the reactants are found in the products.

• New substances form, but their properties stay the same.

• New substances do not always form.

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How can you gather evidence to be sure that a chemical reaction has taken place?

• Compare the original substances and the final substances to see if they look the same or different.

• Compare the mass of the starting substances with the mass of the final substances to see if there is a difference.

• Compare the properties of the original substances and the final substances to see if they are the same or if new substances have formed.

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NGSS.MS-PS1-2

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This model shows the molecule glycerol. What is the chemical formula for this substance?

Green - Carbon

Red - Oxygen

Blue - Hydrogen

• CH₂OH₃

• C₃(OH)₃

• C₃H₈O₃

• (CH₂)₃O₃

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NGSS.MS-PS1-1

Zinc and hydrochloric acid are combined in a test tube. What can you conclude about the chemical reaction taking place? Select all that apply. (3 choices)

• The mass of the products is exactly the same as the mass of the reactants.

• At least one new product formed is a gas.

• Molecules are rearranging into different molecules.

• Atoms are changing into different atoms.

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NGSS.MS-PS1-2

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