8th Grade Science MYA Review

Which of the following best describes how atoms behave in a solid?

• Atoms move freely and are far apart.

• Atoms vibrate in fixed positions and are closely packed.

• Atoms slide past each other and are moderately spaced.

• Atoms are not present in solids.

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

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

Why are models used in science to explain the motion of particles in different states of matter?

• Models are more accurate than real-life observations.

• Models simplify complex concepts and make them easier to understand.

• Models are the only way to observe particles.

• Models are used to replace experiments.

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Which of the following is a characteristic physical property that is independent of the amount of the sample?

• Mass

• Volume

• Density

• Weight

How can you distinguish between a mixture and a pure substance?

• Mixtures have a fixed composition, while pure substances do not.

• Mixtures can be separated by physical means, while pure substances cannot.

• Pure substances are always liquids, while mixtures are solids.

• Mixtures are always homogeneous, while pure substances are heterogeneous.

Which of the following best describes a chemical change?

• Dissolving sugar in water

• Freezing water into ice

• Burning a piece of paper

• Mixing sand and salt

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What is the primary reason for the finite number of elements in the periodic table?

• Elements are constantly being created and destroyed.

• Elements are defined by the number of protons in their atoms.

• Elements can only exist in solid form.

• Elements are limited by the number of electrons they can have.

Which of the following processes is an example of a chemical change?

• Evaporation of water

• Photosynthesis in plants

• Dissolving salt in water

• Melting of ice cream

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How do the physical properties of a substance help in classifying it?

• They determine the color of the substance.

• They provide information about the substance's chemical reactivity.

• They allow comparison based on measurable characteristics like density and solubility.

• They indicate the age of the substance.

Which of the following is a mixture?

• Water

• Carbon dioxide

• Saltwater

• Oxygen