Matter and Mixtures

A group of students did an investigation in which they dissolved different samples of sugar in different beakers of water. The table shows the data (temperature and time to dissolve) from their investigation.

Which of the following is best supported by the data?

• Different sizes of sugar will dissolve at different rates.

• Different samples of sugar will dissolve at different rates.

• Sugar will dissolve slower when the temperature of the water is higher.

• Sugar will dissolve faster when the temperature of the water is higher.

Tags

NGSS.MS-PS3-4

While investigating how solids dissolve, students measured how long it takes for sugar cubes to dissolve in water compared to the same mass of sugar grains. Their data show that it took 15 minutes for three sugar cubes (mass = 12.6 grams) to dissolve completely in water and 9 minutes for the three teaspoons of sugar grains (mass = 12.6 grams) to dissolve completely in water. Which of the following conclusions is the best explanation for this?

• Sugar cubes are made from different types of sugar.

• Larger pieces of sugar take longer to dissolve than smaller pieces.

• The teaspoons were used to stir the sugar grains faster.

• Something was binding the sugar cubes together that took longer to dissolve.

Tags

NGSS.MS-PS1-2

A student was designing an investigation to determine what would affect the rate that a substance dissolves in water. Which of the questions below will most likely help her develop a correct hypothesis?

• Will changing the solute change the rate that a substance will dissolve in water?

• Will changing the temperature change the rate that a substance will dissolve in water?

• Will changing the solvent change the rate that a substance will dissolve in water?

• Will changing the solvent change the rate that a substance will dissolve in water?

True or False: Mixtures can be separated by physical means.

• True

• False

If the doctor uses a centrifuge to physically separate your blood, what type of matter is your blood?

• substance

• mixture

• element

• compound

When you are making a Kool-aid solution, which one of the ingredients is considered the solute and why?

• The wooden spoon because it does the mixing.

• The water because it is dissolving the powder.

• The kool-aid powder because it is being dissolved.

• The kool-aid powder because it is in the largest volume.

Tags

NGSS.MS-PS1-2

Matter is anything that has ____________ and takes up ____________.

• atoms, energy

• mass, space

• minerals, volume

• mass, time

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select the best representation of a heterogeneous mixture.

• 
• 
• 
• 

A substance is...

• matter with the same composition

• something that makes up something else

• physically combined components

• only pure elements

What type of mixture does this image show?

• homogeneous

• homozygous

• heterogeneous

• heterozygous