Milestones Review Questions -24

Steel is an alloy of iron (Fe) and carbon (C). (a)   (b)  

• Homogeneous mixture

• Can be chemically separated

• Pure Substance

• Heterogeneous mixture

• Cannot be separated

Answer explanation

Steel is a homogeneous mixture of iron and carbon, which can be chemically separated. It is not a pure substance or a heterogeneous mixture.

Tags

NGSS.MS-PS1-1

Describe Carbon Graphite. (a)   (b)  

• Pure Substance

• Cannot be separated

• Heterogeneous mixture

• Homogeneous mixture

• Can be physically separated

Answer explanation

Carbon Graphite is a pure substance that cannot be separated into other substances by physical means.

Tags

NGSS.MS-PS1-1

Copper (Cu) and Tin (Sn) are combined to create bronze, a stronger metal alloy. Elements in an alloy do not combine chemically and cannot be physically separated. To separate an alloy, chemical methods are used.
Choose two descriptions for bronze: (a)   (b)  

• Homogeneous mixture

• Can be separated chemically

• Pure Substance

• Heterogeneous mixture

• Cannot be separated

Answer explanation

Bronze is a homogeneous mixture of Copper and Tin, which can be separated chemically, as elements in an alloy do not chemically combine and can be separated using chemical methods.

Copper (Cu), tin (Sn), iron (Fe), and carbon (C) are in soil. What two descriptions fit? (a)   (b)  

• Heterogeneous mixture

• Can be physically separated

• Pure substance

• Homogeneous mixture

• Cannot be separated

Answer explanation

Copper (Cu), tin (Sn), iron (Fe), and carbon (C) in soil form a heterogeneous mixture as they can be physically separated due to their different properties.

Tags

NGSS.MS-PS1-1

What is the correct classification and appearance description for model 1?

* Note: Your answer should include two choices. (a)   (b)  

• Pure Substance

• Uniform color

• Silver and white particles visible

• Homogeneous mixture

• Heterogeneous mixture

Answer explanation

Model 1 is correctly classified as a heterogeneous mixture because it contains silver and white particles visible, indicating a non-uniform composition.

Tags

NGSS.MS-PS1-1

What is the correct classification and appearance description for model 2?

(a)   (b)  

• Pure Substance

• Uniform color

• Silver and white particles visible

• Homogeneous mixture

• Heterogeneous mixture

Answer explanation

Model 2 is classified as a Pure Substance due to its uniform color, indicating a single type of particle present.

Tags

NGSS.MS-PS1-1

When heated, iodine moves from a solid directly to a gas. This process is called sublimation. The three jars show the movement of particles in three states of matter. Choose two of the three jars to show the sublimation of iodine.

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

How should a model of solid particles be changed to show liquid particles?

• Increase the velocities of the particles and decrease the space between the particles.

• Decrease the velocities of the particles and increase the space between the particles.

• Decrease the velocities of the particles and decrease the space between the particles.

• Increase the velocities of the particles and increase the space between the particles.

Answer explanation

To show liquid particles, increase the velocities of the particles and increase the space between them.

Tags

NGSS.MS-PS1-4

How should a model of solid particles be changed to represent a higher temperature?

• Decrease the velocities of the particles and decrease the space between particles.

• Increase the velocities of the particles but maintain the same space between particles.

• Separate the particles into positive and negative charges and increase the space between particles.

• Separate the particles into positive and negative charges but maintain the same space between particles.

Answer explanation

To represent a higher temperature, the velocities of the particles should be increased while maintaining the same space between particles.

Tags

NGSS.MS-PS1-4

Which experiment best demonstrates the chemical properties of matter?

• Mix vinegar with baking soda. The mixture fizzes and produces gas.

• Freeze water to form ice. The water changes from liquid to solid state.

• Expose iron to moist air. The iron remains unchanged.

• Shine light on a colored solution. The color fades over time.

Answer explanation

Mixing vinegar with baking soda demonstrates a chemical reaction where gas is produced, highlighting the chemical properties of matter.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5