Unit 5 Review

The wall next to the window in Jordan’s room is made of brick. Jordan touches the wall and the window to compare their textures. What would Jordan most likely observe?

• The brick and the glass are both rough.

• The brick and the glass are both smooth.

• The brick is rough, while the glass is smooth.

• The brick is smooth, while the glass is rough.

In a science experiment, Kayo added 1 tbsp of sugar to a flask filled with water. The image shows how Kayo’s experiment looked. Which could Kayo do to speed up the dissolving process?

• Add more sugar to the flask.

• Place the flask in an ice bath.

• Shake the flask back and forth.

• Remove some water from the flask

Maxine is studying factors that change how fast a material dissolves in water. Maxine adds 1 g of sugar to 1 cup of water. She records how long the sugar takes to dissolve. Maxine repeats the experiment using four samples. The conditions for each sample are shown in the table.

Based on the evidence in the table, which sample would have the fastest dissolving speed?

• sample 1

• sample 2

• sample 3

• sample 4

Water can be a solid, a liquid, or a gas. The state of water can change as its temperature changes. Which of the following is a change in the state of water that could occur?

• changing a gas directly to a solid by increasing the temperature

• changing a gas directly to a liquid by increasing the temperature

• changing a solid directly to a liquid by increasing the temperature

• changing a liquid directly to a solid by increasing the temperature

Jared has a mixture of fine iron filings and fine aluminum filings. What would be the best way to separate the iron filings from the aluminum filings?

• Pick out the iron particles by hand.

• Pass the mixture through a strainer.

• Add water to dissolve the aluminum.

• Use a magnet to attract the iron filings.

Helen is studying the properties of solids. She is comparing the wooden cube and the steel cube shown in the picture below.

Which property is the same for the two cubes?

• color

• luster

• texture

• volume

Mick lit a candle. The flame heated the top of the candle. The picture shows how the candle looked after 15 min.

Which property of the candle wax changed when the flame heated the top of the candle?

• color

• state

• volume

• weight

Damien filled a salt shaker with black pepper instead of table salt. Damien needs to sort the pepper grains from the salt particles. How could Damien sort the particles?

• Use a magnet to separate the salt crystals from the pepper flakes

• Use a sieve to separate the salt crystals from the pepper flakes.

• Add water to dissolve the salt. Then use a filter to remove the pepper, and evaporate the water, leaving the salt behind.

• Melt the salt crystals and burn the pepper flakes.

A group of students is studying how substances dissolve in water. Each student adds a 1-gram sample of material to 100 mL of water and stirs the liquid for 1 min. The table shows the substance each student tested.

Based on the evidence in the table, which student would have a clear solution with all the material dissolved?

• Imad

• Leah

• Shakia

• Trevor