reviewer

Which type of scientific model uses mathematical equations to represent relationships between variables?

• Physical model

• Experimental model

• Mathematical model

• Conceptual model

What resembles the Plum Pudding Model of the atom?

• A tiny, solid ball with negative charges stuck on the outside.

• A complex mathematical equation describing electron behavior.

• A miniature solar system with planets orbiting a central nucleus.

• A positively charged sphere with negatively charges scattered throughout.

Water is composed of two atoms of hydrogen and one atom of oxygen. Which of the following can be the particle model for water?

• 
• 
• 
• 

Which best explains why solids are the densest among the three states of matter?

• Their particles cannot move freely.

• Their particles vibrate in fixed positions.

• They have the greatest number of particles per unit volume.

• They have the stongest attractive force between particles.

Why does gas particles move the fastest?

• Their particles cannot move freely.

• They have the greatest number of particles.

• Their particles vibrate in fixed positions.

• Their particles can move freely.

Snowflakes will land on the ground and turn back into liquid water.

What phase change is happening in this scenario?

• melting

•  

  evaporation

• condensation

• freezing

Why hang-drying clothes is faster in outdoors than indoors?

• It is because of low temperature.

• It is because of high temperature.

• It is because of same temperature.

• None of these.

If you have an orange juice and you keep it in a freezer, what will happen?

• It will turn into popsicle known as freezing.

• It will turn into popsicle known as melting.

• It will turn into popsicle known as condensation.

• None of these

What happens when water changes state from liquid to gas?

• The water particles dissociate into hydrogen and oxygen gases.

• The water particles have greater attractive forces between them.

• The water particles lose motion energy.

• The water particles move faster and farther away from one another.

A scientist heats a liquid to its boiling point. He measures and records the temperature of the liquid every five minutes. Which of the following steps of the scientific method is he doing?

• formulating hypothesis

• gathering data

• identifying a problem.

• generating a conclusion