Periodic Test in Science 7

Why do scientists use models?

• They are exact representations of reality.

• They only exist in computer simulations.

• They are always simple and easy to understand.

• They can be used to test ideas and make predictions.

What can be a limitation of scientific model?

• They are never updated or improved.

• They are all based on real-world data.

• They are only used in physics, not other sciences.

• They cannot perfectly capture all the complexities of a system.

Which of the following CAN NOT be a scientific model for the atom?

• A song with lyrics full of subatomic particles and their charges.

• A round Styrofoam colored with parts representing electrons and other subatomic particles.

• A computerized interactive game where you can put subatomic particles and guess the correct image for atom.

• An image (picture, concept map, flowchart, etc.) that considers all laws of science.

What is the characteristic of solid particles as seen in its particle model?

• Moving freely and spread far apart.

• Arranged in a specific pattern but with large gaps.

• Vibrating in place with minimal space between them.

• Flowing around each other and constantly changing positions.

What can be seen in the physical model of the Bohr model of the atom?

• A cloud of electrons

• nucleus at the center

• Presence of orbitals

• Nothing, just empty space

How did the Kinetic Molecular Theory describe the particles of a solid?

• Only vibrating in place.

• Completely still and packed together.

• Constantly moving with large spaces between them.

• Constantly moving with very small spaces between them.

Which of the following shows how particles behave when heated?

According to Kinetic Molecular Theory, what happens to the particles in a substance as its temperature increases?

• They move faster

• They stop moving

• They move slower

• Their arrangement doesn't change

In which state of matter do particles have the most freedom of movement?

• Gas

• Liquid

• Solid

• All states of matter have same freedom of movement.

What do you think is happening in Figure 1 below in terms of temperature change?

• The liquid substance was frozen and became solid.

• Temperature dropped and solidified the substance.

• The liquid substance was heated and evaporated as gas.

• Temperature was increased, and the substance was liquified