15.1 - Composition of Matter(25pts.)

In a science class, Jay recalled that (a)   are pure substances where all the atoms are alike. Daniel explained that (b)   are substances made out of two or more different types of atoms. Xavier noted that (c)   are a combination of two or more substances.

• elements
• compounds
• mixtures
• physical property

Answer explanation

The correct choices are elements, compounds, and mixtures. Elements are pure substances with identical atoms, compounds are made of different atoms, and mixtures are combinations of substances.

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In culinary class, Layla and Kayla observed a tray of food. They noted that the materials on the tray form a (a)   mixture because each component can be seen and picked out separately.

• Heterogeneous
• Homogeneous

Answer explanation

In a heterogeneous mixture, each component can be seen and picked out separately, which is the case with the food on the tray observed by Layla and Kayla in Culinary class.

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Mason is looking at this diagram in his chemistry textbook. The diagram represents...

• An element

• A molecule

• A compound

• A mixture of compounds

Answer explanation

The diagram represents a mixture because the observable particles are different compounds, MIXED together.

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What type of matter is represented in the diagram?

• element
• compound
• mixture of elements
• mixture of compounds

Answer explanation

Since the diagram has individual atoms of the same type, the diagram represents atoms of an Element.

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HS-PS1-3

Adrian is looking at a salad containing oil, vinegar and spices. What type of mixture is this?

• heterogeneous 

• homogeneous

Answer explanation

The salad dressing containing oil, vinegar, and spices is a heterogeneous mixture because the components are not uniformly distributed and can be visually distinguished.

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HS-PS1-3

Fill in the the chart

c

d

e

f

b

a

pure substance

mixture

element

compound

Heterogenous

Homogenous

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During a science class experiment, Estrella shines a flashlight through a jar of liquid and observes the (a)   effect, which is visible as the light beam scatters.

Adriana noted that this experiment helps distinguish a colloid from a (b)   .

• Tyndall
• solution
• Bohr

• Rutherford
• element
• atom

Answer explanation

Estrella observed the Tyndall effect when the light beam scattered through the liquid, distinguishing a colloid from a solution.

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Organize these options into the right type of mixture

Groups:

(a) Solutions

,

(b) Colloids

,

(c) Suspensions

• Have particles that can be seen with your eyes.

• 
• Have particles that are completely dissolved.

• Have particles can be seen with a microscope.

• 
• 
• Do not scatter light

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How can Jordan observe the Tyndall effect during a science project?

• By shining a flashlight through a jar of liquid and seeing the light beam

• By looking at the sky on a cloudy day

• By mixing oil and water

• By freezing water into ice

Answer explanation

By shining a flashlight through a jar of liquid and seeing the light beam

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Gabriel says that ocean water is a solution.

Zach says that ocean water is a suspension.

What claims and evidence are being presented?

[Select all that apply]

• Since ocean water contains dissolved salts, it is a saltwater solution.

• Some ocean water seeps into thermal vents, so it increases thermal energy making it a suspension.

• Some ocean water also contains loose sand and other materials in suspension.

• Some ocean water contains living species it is a solution.

Answer explanation

The claim Gabriel made was that ocean water is a saltwater solution due to dissolved salts.

The claim that Zach made is that it contains loose sand and other materials so it is a suspension.

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