Classify each one of the following as pure substances or mixtures:
1. air
2. neon
3. liquid nitrogen
4. hydrochloric acid
5. petrol
6. river water
7. carbon dioxide
8. aluminium
9. window glass
10. milk
11. distilled water
12. sodium chloride
13. gold ore
14. seawater
15. cola drink
16. vinegar
17. krypton
18. brass
19. marble
20. titanium
21. ozone
22. ice
23. butter
24. copper
25. polystyrene
26. sulfur
27. paper
28. concrete
29. steel
30. glucose
sort all pure substances into compounds and elements and sort all mixtures into heterogeneous mixtures and homogeneous mixtures.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .

The density of e85 fuel is 0.801 g/ml. what is the mass of 1.00 gallon of the fuel? (1 gal. = 3.785 l)