A scientist observes that lake water forced through a certain filter removes most of the particles in it. What is the process being used and what interpretation can the scientist make?

1. The process of filtration is working to remove residue from the lake water.

2. The process of filtration is working to remove all of the dissolved impurities from the water.

3. The process of evaporation has removed most of the particles, so the filter is unneeded.

4. The process of water force is keeping the water completely pure, so the filter is working.

I believe your answer should be 1 because filteration is a process of removing solid particuless/ and or gasses of matter from the lake in this interpretation. and filtration is used to allow fluidly bodies through but not matter.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms