Science 7 First Quarter Exam

What is a common use of models in science?

• To test ideas and make predictions

• To provide exact copies of real-life objects.

• To function exclusively in computer environments.

• To ensure everything is simple and easy to understand.

To model the behavior of liquid particles in a container, which particle behavior should you apply in your model?

• Particles are in one spot and move a little.

• Particles are spread out and move around easily.

• Particles are lined up in a solid pattern and only shake a bit.

• Particles move around each other and have some space between them.

If you use the Plum Pudding Model to describe how electrons are arranged in an atom, which characteristic does it highlight?

• Electrons have fixed energy levels.

• The nucleus contains most of the atom's mass.

• Atoms consist mainly of empty space.

• Electrons are embedded in a uniform positive charge.

What can you say about the particles of liquid in contrast with a solid?

• A predictable pattern of movement

• Less movement and are more tightly packed.

• The same amount of movement and spacing.

• More freedom to move and more space between them.

Which of the following best evaluates the effect of heating on the particles of a material?

• They become slightly compacted but can still move.

• They move farther apart from each other.

• They gain a more definite shape and become more compact.

• They remain unchanged because heat is not absorbed.

Which of the following is NOT one of the three main states of matter?

• Solid

• Liquid

• vapor

• gas

Given that water is made up of two hydrogen atoms and one oxygen atom, which of the following diagrams accurately represents the particle model of water?

• 
• 
• 
• 

Based on the model below, which state of matter is represented, and how does this relate to the kinetic theory of matter?

• Gas - Particles are moving rapidly and have large spaces between them

• Liquid - Particles are moving moderately with some spacing

• Solid - Particles are vibrating in place with a fixed arrangement

• Plasma - Particles are moving extremely rapidly and are ionized

How would you analyze the effect of temperature changes on the speed and spacing of particles?

• As temperature increases, the particles move slower and are closer together.

• As temperature increases, the particles move faster and spread farther apart.

• As temperature decreases, the particles move faster and are further apart.

• As temperature decreases, the particles move slower and spread farther apart.

How would you describe the movement (speed) of particles in solids, liquids, and gases?

• Particles move at the same speed in all states of matter.

• Particles in solids move faster than those in liquids and gases.

• Particles in gases move faster than those in solids and liquids.

• Temperature doesn't affect how fast particles move.