Science Unit 2 Assessment

You pour honey onto your pancakes, and it flows slowly compared to water. What does this tell you about the honey?

• It has a higher viscosity than water.

• It has particles that flow freely like a gas.

• It has a lower viscosity than water.

• It is a solid liquid.

You leave a cold glass of water outside on a warm day. After an hour, you notice droplets forming on the outside of the glass. What is happening?

• The water is evaporating into the air.

• Condensation forms from the air condensing on the cold glass.

• The glass is absorbing water from the table.

• The glass is leaking water.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When you open a bottle of soda, bubbles start to form and rise to the top. Why does this happen?

• The gas particles were compressed and escape when the bottle is opened.

• The soda turns into a solid when opened.

• The liquid and gas mix to form a heterogeneous mixture.

• The temperature of the soda increases, turning it into a gas.

You accidentally spilled salt in a glass of water and stirred it. After a while, you can’t see the salt anymore. What type of mixture have you created?

• Heterogeneous mixture

• Homogeneous mixture

• Chemical change

• Physical change

While hiking on a frosty morning, you notice frost forming on the leaves of plants. What is this process called?

• Evaporation

• Deposition

You heat up a pot of soup, and steam starts to rise. What is happening to the particles in the soup?

• A. They are slowing down and sticking together.

• B. They are gaining energy and moving faster, changing into gas.

• C. They are freezing into a solid.

• D. They are turning into a plasma.

Tags

NGSS.MS-PS1-4

On a hot day, you leave a chocolate bar in your backpack, and it melts. What kind of change has occurred?

• A. Chemical change because new substances formed.

• B. Physical change because it can still solidify again.

• C. Deposition because it changed states.

• D. Sublimation because it skipped a liquid phase.

Tags

NGSS.MS-PS1-4

When baking cookies, the dough turns golden brown in the oven. Which type of change has occurred?

• A. Physical change because the dough just changes shape.

• B. Physical change because it melts in the heat.

• C. Chemical change because new substances are formed.

• D. Chemical change because the dough stays the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

You mix sand and water in a jar. After shaking it, you notice the sand settles to the bottom. What type of mixture is this?

• A. Homogeneous mixture because the sand disappears into the water.

• B. Heterogeneous mixture because the sand and water separate.

• C. Physical change because the sand dissolves in the water.

• D. Chemical change because the sand changes into something new.

You have a bowl of trail mix with nuts, dried fruits, and candies. What kind of mixture is this?

• Homogeneous mixture because all parts look the same.

• Heterogeneous mixture because you can see the different parts.

• Physical change because the items stay the same.

• Chemical change because the items combine into something new.