Nature of Matter Unit 1 ATT 2025

Matter can be classified as either a pure substance or mixture. Pure substances include elements and compounds. Review the diagrams of the five samples of matter. Which diagram represents a single compound?

• I.

• II.

• IV.

• III.

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GA.S8P1.a

Matter can be classified as either a pure substance or mixture. Air is a mixture of diatomic gases: 21% oxygen and 78% nitrogen. Which image could be a model for a mixture like air?

• A. I.

• B. II.

• C. III.

• D. IV.

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GA.S8P1.a

Elaborate on how to classify elements and pure compounds.

• These materials are homogeneous mixtures because they have a uniform composition throughout.

• These can be either homogeneous or heterogeneous materials based on the individual solubility of each.

• Elements and pure compounds are homogeneous materials because they have a uniform composition throughout.

• They are heterogeneous materials because they do not have a uniform composition or appearance throughout.

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GA.S8P1.a

The approximate composition of the atmosphere is shown in the pie-chart. Which statement BEST describes the chart?

• The chart shows the percentages of elements in a mixture.

• The chart shows the percentages of elements in a compound.

• The chart shows the percentages of pure substances in a mixture.

• The chart shows the percentages of compounds in a pure substance.

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GA.S8P1.a

Drag and drop each label to the correct column. The number tells you how many correct answers should be in each.

Groups:

(a) Mixtures (3)

,

(b) Compounds (3)

,

(c) Both (2)

• Made of elements

• Chemically combined

• 2 or more componenets

• Physically combined

• Components change properties

• Componenets retain properties

• Fixed proportions

• Variable proportions

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GA.S8P1.a

After some steel was made, twenty samples were taken from one piece and tested. Each sample was found to contain exactly 98% iron and 2% carbon. Which of the following best describes steel?

• Heterogeneous mixture

• Element

• Homogeneous mixture

• Compound

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GA.S8P1.a

Drag the labels to where they belong on the diagram.

a

b

c

d

e

f

g

h

Particles can slip past each other

Solid

Particles constantly collide

Least Kinetic Energy

Gas

Particles only vibrate in place

Liquid

Most Kinetic Energy

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GA.S8P1.b

Match each state of matter with its correct property:

• plasma

• conforms to the shape of its container but retains a nearly constant volume independent of pressure

• solid

• maintains a fixed volume and shape

• gas

• electrically conductive, produce magnetic fields and electric currents

• liquid

• has both variable volume and shape; expands to fill container

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GA.S8P1.b

Consider the phase change taking place in the picture. You could use ALL BUT ONE statement to describe what is happening here.

• Temperature is increasing.

• Kinetic energy is increasing.

• The space between the particles remains the same.

• The attractive force between the particles is decreasing.

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GA.S8P1.b

Magnesium (Mg) is a grayish-white metal and reacts actively with water. Fluorine (F₂) is a greenish-yellow gas at room temperature and is a member of the halogen family. These two elements react to produce magnesium fluoride (MgF₂), a chemical commonly used in making windows and lenses. How does adding heat energy affect magnesium fluoride (MgF₂) molecules?

• The motion of the molecules stops.

• The motion of the molecules increases.

• The motion of the molecules decreases.

• The motion of the molecules is at a constant rate.

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GA.S8P1.b