Mixtures and Separating Mixtures

I have a mixture of iron, sand, gravel, and salt water. What are the best steps could I use to separate the mixture, and in what order?

• boil the mixture; evaporate the salt; and then use a magnet to get the iron

• use a magnet to get the iron; filter the mixture in a filtration set up; catch the filtrate which has salt and then evaporate it to get the salt

• boil the mixture to remove the salt; filter the remaining mixture and the use a magnet to get the iron

• distill the mixture to remove the water; then use a magnet to get the iron; then "hand pick" the gravel pieces using fine forceps

There is a mixture of water and alcohol that needs to be separated and captured for use in a lab. What nondestructive technique is best suited for this separation?

• evaporation and filtration

• filtration and electrolysis

• distillation

• filtration followed by freezing

When using the Hoffmann apparatus Mr. V demonstrated electrolysis of water. This process results in a

• chemical change

• physical change

• phase change

• apparent change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Electrolysis of water produces what two products?

• steam and ice

• oxygen and nitrogen

• hydrogen and helium

• hydrogen and oxygen

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In lab, a salt water solution was collected; it needs to be separated. What is one way to isolate the salt?

• evaporation

• freezing

• filtration

• use a strong magnet

Tags

NGSS.MS-PS1-4

If a sugar water solution was filtered, what would be contained in the filtrate?

• sugar

• water

• water and oxygen

• sugar water

Which of the following IS NOT a homogeneous mixture?

• table salt dissolved in water

• gator aid

• hot tea

• wood

What characteristic of heterogeneous mixtures separates them from homogeneous mixtures?

• phase boundaries

• liquid phases

• solid phases

• gaseous phases

Elements, compounds, and molecular substances are considered

• heterogenous

• the most basic form of matter

• pure mixtures

• homogeneous

Tags

NGSS.MS-PS1-1

When two colorless solutions are combined, they turned a cloudy white color and a precipitate was formed. This mixture would be considered

• homogeneous

• heterogeneous

• just a physical change

• a violation of the law of conservation of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5