Classify the following as an Element(E), Compound(Com), Heterogeneous Mixture(HM), Solution(Sol), Suspension (Sus) or Colloid(Col).
1. Copper
2. Steel
3. Pizza
4. Chocolate Chip Ice Cream 5.Com Sodium chloride 6. Coke
7.Silver
8.
Gold ring
9. Salt dissolved in water
10.Orange juice
11. Bricks
12. HM Honey
14.
13.com Calcium
Earth
15. Table salt
16. E_Magnesium
17.
Vegetable soup
18. Corn starch in water
19. Hm Sand on the beach 20. Diamond
21. Pencil lead
22.] + M Glass
23. Vinegar
24. Air
Helium
26. Cheerios
27. Paper
28. HM Uranium
29. The Moon
30. Clouds
25. €

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.

Which factor is likely to impact the possible number of compounds ?

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.