CHeMistry =[?
2. The Color of light depends on its wavelength. The longest visible rays, at the red end of the visible spectrum are 0.000078 cm. in length. Express the length in microns and in angstroms.
3. Air weight about lbs. per cubic feet. What is its density in grams per cubic feet and grams per litter?
4. A specific gravity bottle weight 220 grams when empty, 380 grams when filled with water, and 351 grams when filled with kerosene. Find the specific gravity of kerosene and the capacity of bottle.
5. Calculate the density and specific gravity of a body that weighs 420 grams and has a volume of 52 cc.
6. The density of zinc is 455 lb per cubic foot. Find the specific gravity of zinc and the weight of a 9 cc of Zn.
Can anyone help me, i realy suck in chemistry.
i still have many here 100 question to answer in 1 day but i answered 40% but this question left is quite hard. pls show me formu
Answer:
1..1milligram = 1/1,000th of a gram. 32g x 1,000 = 32,000mg.
1gram = 1/1,000th of a kg. 32g/1,000 = 0.032kg.
1kg = 2.2lb. 0.032kg x 2.2 = 0.07lb.
No.2...No idea.
3..Air has a density of 0.08lb/ft³
0.08 x 454g/lb = 36.32g/ft³
Air density = 1.2kg/m³ = 1.2 ÷ 1,000 = 0.0012g/L
4..a)..351 ÷ 380 = 0.923 S.G.Kerosine
.b)..220 ÷ 380 = 0.579 S,G. Bottle
5..420 ÷ 52 = 8.08g/cc Density. S.G. = 8.08
6..Density of water = 62.4lb/ft³.
a..Zn S.G = 455lb ÷ 62.4lb/ft³ = 7.29
b..9cc x 7.29 = 65.6grams Zn.
The colour of light is dependent upon the frequency, not the wavelength. When light passes through a medium, it's wavelength changes, but it's frequency remains constant, and it stays the same colour.
1) 32gO----> 32000kg 0.032 mg 0.070547 lb
5)D=420g / 52cc = 8.07 g/cc
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