Zombie Apocalypse Separation Techniques

You needed to purify some water from a dirty creek because it is the only water available while your escaping some zombies. What material would be best to use a filter?

• Cloth

• Mesh

• Cotton wool

• Pantyhose

You remember back in the good old days, when there were not zombies. You could do experiments.

You did an investigation to find out what materials were best at filtering dirty water. What was the independent variable?

• the type of material

• the water quality

• the volume of water

• the rate you poured the water

You remember back in the good old days, when there were not zombies. You could do experiments.

You did an investigation to find out what materials were best at filtering dirty water. What was the dependent variable?

• the type of material

• the water quality

• the volume of water

• the rate you poured the water

You remember back in the good old days, when there were not zombies. You could do experiments.

You did an investigation to find out what materials were best at filtering dirty water. Which is not a controlled variable?

• the person doing the pouring

• the water quality

• the volume of water

• the rate you poured the water

In your zombie apocalypse water filtering investigation, your team mates measured the turbidity while using the pantyhose as a filter and got 650 NTU, 645 NTU, 520 NTU and 660 NTU.

Which is probably the outlier?

• 650 NTU

• 645 NTU

• 520 NTU

• 660 NTU

In your zombie apocalypse water filtering investigation, your team mates measured the turbidity while using the pantyhose as a filter and got 650 NTU, 645 NTU, 520 NTU and 660 NTU.

What is the average turbidity?

HINT: When calculating the average you add all the trials together and divide by how many trials you do. Make sure you DO NOT include outliers.

• 652 NTU

• 645 NTU

• 520 NTU

• 660 NTU

In your investigation what is turbidity?

• How murky the water the water is

• How salty the water is

• The suspension

• A colloid

What is the unit of turbidity?

• NTU

• NUT

• NANA

• MM

What would be the best aim for your investigation?

• find the material that can produce the cleanest filtrate

• Make pure water

• Find the best filter

• Survive a zombie apocalyse

What is filtration?

• A method used to separate a solid from a liquid that dissolves in the liquid

• A separating technique used to separate a mixture of a solid and liquid where the solid does not dissolve in the liquid