Water filter project: using different types of filters to filter water, trying to figure out if the changes to the water would be physical, biological or chemical.

the filters are:

rocks

charcoal

radiological

polyfill

cotton cloth.

Elements can be separated into simpler substance by chemical reactions. a. True b. False

Describe the speed of a sound wave as it travels from underwater to the air.

Discuss why temperature is the most important factor in determining the state of a substance.

Liquids and solids are referred to as "condensed phases" because the attractive forces cause molecules to become stationary. leave little space between the molecules. create large spaces between the molecules.

A potassium atom easily loses its one valence electron. what type of bond will it form with a chlorine atom?

A) the ka for acetic acid (h3cco2h) is 1.737 * 10-5. what is the pka for this acid? b. use the pka calculated above to determine the ph at which [h3cco2h]=[h3cco2-].

Suppose you take a piece of hard wax from an unlit candle. After you roll the wax between your fingers for a while, it becomes soft. What State of matter is the softer wax? Is it possible for wax to change without changing state

Prevailing winds peru

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.