SCIENCE 7_1ST QUARTER EXAM

Which of the following statements is CORRECT?

• Both elements and compounds are pure substances.

• Compounds are not elements and are pure substances.

• Elements are not compounds and are pure substances.

• Neither elements nor compounds are pure substances.

A mixture of sand, gravel, and cement in concrete is an example of a _____.

• Pure substance

• Homogeneous mixture

• Heterogeneous mixture

• Single-phased mixture

In a solution, what do you call the substance in a larger amount?

• salt

• solute

• solvent

• sugar

In a solution, what do you call the substance in a smaller amount?

• salt

• solute

• solvent

• sugar

Which among the following is an example of a heterogeneous mixture?

• Halo-halo

• Hot Milk

• Hot Coffee

• Juice

Which among the following is an example of a homogeneous mixture?

• Halo-halo

• Pizza

• Ginataan

• Hot Milk

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 is the characteristic of solid particles as seen in their 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 you say about the particles of liquid in contrast with solids?

• 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

What happens to the particles of a material being heated?

• Slightly compacted but can move.

• Moves farther away from each other.

• Gains more definite shape and compactness

• Nothing happens because heat is not absorbed.