Science 7 PBA#1 Review

What happens to the particles of a solid substance when thermal energy is added?

• The particles stop moving completely.

• The particles move more slowly and become more compact.

• The particles move faster and spread out more.

• The particles become smaller particles.

Tags

MS-PS1-4

Describe what happens to the movement of particles and the state of a liquid when thermal energy is removed.

When thermal energy is removed, the particles in a liquid (a)   and become (b)   (tightly packed). This can cause the liquid to turn into a solid, like when water freezes into ice.

• slow down

• denser

• move faster

• less dense

Tags

MS-PS1-4

Which of the following are signs that a chemical reaction has occurred? Select all that apply.

• Color change

• Boiling water

• Gas formation (bubbling)

• Temperature change

• Melting ice

Tags

MS-PS1-2

A student mixes baking soda with vinegar and observes bubbling and a drop in temperature. This is evidence that a ______ change occurred.

• physical

• chemical

Tags

MS-PS1-2

What state change occurs when thermal energy is removed (cooled) from water vapor (gas)?

• The water vapor changes to liquid water.

• The water vapor changes to solid ice.

• The water vapor remains the same.

• The water vapor turns into vapor.

Tags

MS-PS1-4

After burning a piece of paper, a student notices that ash is formed and smoke rises. Which of the following options suggest that a chemical reaction took place? Select all that apply.

• Ash is formed

• The paper melts

• Smoke rises

• New substances are formed

Tags

MS-PS1-2

When a solid is heated, the particles _______, and the solid may melt into a liquid.

• move faster

• move slower

• stop moving

Tags

MS-PS1-4

Which of the following are examples of physical properties? Select all that apply.

• Melting point

• Flammability

• Density

• Solubility

Tags

MS-PS1-2

When a cake is baked, how are the properties of the cake different from the original ingredients (such as flour, eggs, and sugar)?

• The cake remains the same as the ingredients.

• The cake has new properties that are different from the original ingredients.

• The cake can be separated back into flour, eggs, and sugar.

• The ingredients melt together but do not change.

Tags

MS-PS1-2

Explain what happens to the movement of water particles when it boils and turns into vapor.

The water particles (a)   when boiled because heat is added. As the temperature increases, the liquid water turns into gas (vapor), and the particles move (b)   and (c)   .

• move faster
• quickly
• separate
• move slower

• slowly

• come closer

Tags

MS-PS1-4