Chemistry, Major help needed. Please help me very important?

Question

People i desparately need anyones help, i have a exam this friday and i need to know answers to a couple of these question i will be forever grateful to whoever helps me. I REALLY need this please and thank you.

Questions:

1) What kind of intermolecular forces exist between molecules of water? Which of these gives water most of its uniqure properties

2) What color is seen when the following ions are used in a flame test: a) strontium, b) copper, c)sodium, d) magnesium

3) What kind of symbol would be found on a bottle of concentrated hydrochloric acid?

4) How do ionic substances dissolved in water

5) What property of water changes when calcium and magnesium ions are in high concentrations?

6) What changes happen to a lake when the concentration of human/industrial waste increases

bonus- you can answer this if u want to

what are th three types of conaminants for water

Thank you and i really appreciate all this help. THANK YOU!

Answer 1

1. Van der waals, dipole dipole interactions, and hydrogen bonding. Hydrogen bonding is the strongest and gives water its unique properties.

2. a. red, b. blue/green/bluish green, depending on oxidation state and counterion; c. yellow; d.white/silver

3. HCl, a skull and crossbones

4. ionic substances are dissociated into their consituent positive and negative ions

5. Hard water. Its conductivity increases greatly.

6. Eutrophication: algae cover the lake; native plants and animals die