My class is doing an experiment. We have a normal 500ml plastic bottle, with the bottom slightly cut off. We then have filtration materials such as pebbles(biggest but floats in water), gravel(second finest but is very powdery), and sand(finest). We each get a coffee filter paper along with some paperclips and rubber bands. We have to filter dirty lake water to clear, odourless water into a beaker. What is the best combo? And where should I apply the coffee filter paper? Thanks for your help!

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A brick of mass 2.0 kg is "weighed under water" by hanging it from a spring scale ad suspending it in a beaker of water.

If the spring scale reads 14.0 N, what is the upward force of the water on the brick?

What is the reading on the pan scale on which the beaker sits? The weight of the water and the beaker together is 12.0 N.

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1. A pure substance that decomposes gently when heated would be classes as:
a. an element
b. a metal
c. a non-metal
d. a compound
e. a mixture of elements

Which of the following processes could best be used to obtain pure water from a solution of sodium chloride and water?
a.Chromatography
b.Filtration
c.Decantation
d.Distillation
e.Evaporation

Which one of the following processes would be the most suitable for separating the different dyes from a sample of black ball point ink?
a. Chromatography
b.Distillation
c.Evaporation
d.Filtration
e.Decantation

A beaker of muddy water contains only dissolved salt and some suspended materials. Which one of the following procedures would be the best way to recover the pure salt?
a.filter first, then decant
b.decant first then filter
c.evaporate first, then filter
d.evaporate first, then decant
e.filter first, then evaporate

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I need to make one for Science class, with only materials that are usually found at home. I cannot add chemicals to the treatment process. No one is going to be drinking the water. The purification system should be able to remove garbage (leaves, rocks, wrappers) and clean the colour of the water, somewhat, so that the end product is a beaker of water that has no garbage in it, and somewhat clear. Like I said before, no chemicals, and no one is going to be drinking it.

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This is for a science (specifically Chemistry) lab we were doing. Our teacher brought out a beaker with a muddy mix of water and dirt, telling us to try and seperate the dirt from water and produce as much pure water as possible. We have access to all the equipment at school, like the bunsen burners, beakers and such. He instructed us to create an original way to filter out the dirt. We are allowed to bring materials or supplies from home, although he suggested not to bring coffee filters as that isn’t very original… and I have been brainstorming with no conclusions. Any suggestions or cool ideas?

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