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.

A 9.87-mol sample of Zr represents how many atoms?

In nature, oxygen has three common isotopes. The atomic masses and relative abundances of these isotopes are given in the table below. Isotope Atomic Mass (amu) Relative Abundance O-16 15.995 99.759% O-17 16.995 0.037% O-18 17.999 0.

What evidence supports Bohr's claim that an electron is found only in specific energy levels around the nucleus of the atom. And then connect this evidence to the claim through reasoning

What are the raw materials/reactants and products of photosynthesis

how many chromosomes are in sperm or egg cell if when they come together to form fertilized zygote there are 46 chromosomes?

Draw a structure of glycogen with two alpha (1>4) linkages and two alpha (1>6) 3 linkages between glucose molecules What advantage does a branched structure have over a straight chain polysaccharide? b.

Who invented carbon element?

what natural resources are used to make a computer? what natural resource am i using to operate a computer?

What are 5 examples of physical changes and chemical changes?

Which statement is true of the carbon atoms that make up a diamond