An identical amount of sugar crystals were placed in the two cups of water seen in the picture. Which statement BEST describes the differences seen in the cups?

• Sugar crystals take longer to dissolve in cold water.

• The sugar crystals placed in the hot water were probably smaller than those placed in the cold water.

• Sugar crystals do not dissolve in water.

• Sugar crystals take longer to dissolve in hot water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What instrument is MOST LIKELY used to separate iron fillings from sand?

• A funnel.

• A magnet.

• A strainer.

• A beaker.

Three ways to speed up the dissolving process are:

• Increasing temperature, making particles smaller, and filtration.

• Increasing temperature, making particles smaller, and stirring the solution faster.

• Increasing temperature, stirring the solution faster, and filtration.

• Making the particles smaller, stirring the solution faster, and filtration.

Manny's teacher created a mixture of sand, iron fillings, glass beads, and pennies. Manny was asked to describe the steps that should be taken to separate the parts of the mixture?

• Use a magnet to remove the iron filings, use a sieve to remove the pennies and glass beads from the sand, separate the pennies by hand.

• Separate the pennies from the glass beads by hand, use a sieve to separate the sand and iron fillings.

• Remove the iron filings and pennies with a magnet, use a coffee filter to remove the sand from the beads.

• Use a coffee filter to remove the iron filings from the sand, use a sieve to remove the pennies from the beads.

Nelson was going to bake cookies. His recipe called for water and oil. He decided that he would measure both at the same time. First, he put ½ a cup of water and then he put ¼ cup of cooking oil into a glass measuring cup. He stirred to mix the two liquids. When he was ready to add it to dry ingredients, he noticed the oil and water had separated into two layers.

Why did the liquid separate into two layers?

• It was not stirred enough.

• There was not enough water .

• Oil does not dissolve in water.

• The oil and water were not the same temperature.

Tags

NGSS.MS-PS1-2

What is the BEST tool to separate gravel from sand?

• use a magnet

• use tweezers

• pour the mixture through filter paper

• use a strainer or sieve

How would you separate a mixture of sand and water?

• by sorting by shape

• by evaporation

• by using a magnet

• by filtering

How would you separate a mixture of salt and water?

• straining

• filtering

• evaporation

• using a magnet

The oil in this water is . . .

• soluble

• insoluble

Tags

NGSS.MS-PS1-2

The smaller the particle size the faster the rate of dissolution (rate of dissolving).

• True

• False