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Karo-lina-s [1.5K]
3 years ago
12

During a total solar eclipse, the Earth, Sun, and Moon are arranged in a line, and almost all of the Sun's light traveling to th

e Earth is blocked by the Moon.
In what order do the Earth, Sun, and Moon line up?
A.
Earth, Sun, Moon
B.
Sun, Earth, Moon
C.
Sun, Moon, Earth
D.
Moon, Sun, Earth
Chemistry
2 answers:
Katen [24]3 years ago
6 0
C. Is what I think answer is
Flauer [41]3 years ago
5 0
The answer would be A
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<span>A chemist adds 155.0ml of a 4.10 X 10^-5 mmol/L of a zinc oxalate (ZnC2O4)solution to a reaction flask. Calculate the mass in micrograms of zinc oxalate the chemist has added to the flask. 1mmol = 10^-3 mol Therefore 4.10*10^-5mmol = 4.10*10^-8mol molar mass ZnC2O4 = 65.39+(2*12.011)+(4*15.99) = 153.372g/mol You have 4.10*10^-8 mol/litre =153.372 * 4.10*10^-8 = 6.29*10^-6 grams / litre (* see below) But you have 155ml. Mass of ZnC2O4 = 155/1000*6.29*10^-6 g Mass is = 9.75*10^-7 grams 1µg = 10^-6 g You then have 9.75*10^-7/10^-6 = 0.975µg ZnC2O4 (*see below) at this point you could have said: 1µg = 10^-6 g therefore you have a solution of 6.29µg per litre, 155ml = 6.29*155/1000 = 0.975µg ZnC2O4</span>
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3 years ago
2 Ag20 →4 Ag + O2 what reaction is this​
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What is the main reason that Absolute Zero has not been achieved under laboratory conditions?
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