Science 7 _Review 1st

What do you call the type of model that is either bigger or smaller than the actual object?

• scale model

• replica

• mathematical model

• figurine

Which of the following is a limitation of a model?

• It is affordable.

• It helps people understand ideas and concepts.

• Mathematical model

• It cannot contain all the details of the object or phenomenon it represents.

Which of the following is true about liquid?

• Its particles do not vibrate.

• Its particles are very far from each other.

• Its particles can take the shape of its container.

• Its particles are arranged very close to one another with a little space in between.

Which statement best describes the particle model of matter?

• All matter is made up of large, visible particles that are identical.

• All matter is made up of tiny particles, and each pure substance has its own kind of particles.

• All matter is made up of tiny particles that are always different in every sample.

• All matter is made up of particles that cannot move.

Which of the following is an example of the particle model of matter?

• Sugar and salt look the same but are made of different types of particles.

• Water can exist as solid, liquid, and gas without changing its particles.

• Particles in solids can move freely and occupy more space.

• All liquids are made of the same type of particles.

Which of the following best describes evaporation?

• Evaporation is when liquid particles gain more kinetic energy and becomes gas.

• Evaporation is when solid particles gain more kinetic energy and becomes liquid.

• Evaporation is the transformation of gas to solid without entering the liquid phase.

• Evaporation is the transformation of solid directly to gas without entering the liquid phase.

Which of the following is NOT an example of the melting process?

• The conversion of dry ice to vapor

• The softening of metals while being forged into kitchenware

• The rocks that are turned to magma due to heat of the earth's interior

• The conversion of polar ice caps to water that increases coastal levels

Explain the changes of state in terms of particle arrangement and energy changes: a. solid → liquid → vapor, and b. vapor → liquid → solid. What happens to the energy of water particles as water changes from liquid to vapor?

• Energy decreases, and particles slow down.

• Energy remains the same, and particles do not change speed.

• Energy increases, and particles move faster.

• Energy is released, and particles become more ordered.

Which comes after formulating a hypothesis?

• Stating the problem

• Stating the conclusion

• Communicating the result

• Conducting an experiment

What step in scientific investigation does a scientist do when he/she listens to the sounds of thunder?

• formulating a hypothesis

• drawing conclusions

• making observations

• testing a hypothesis