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Semenov [28]
3 years ago
12

AHHHHH HELP ME WITH THESE QUESTIONS FOR MY QUIZ

Chemistry
1 answer:
mash [69]3 years ago
4 0

Question 6: True

Question 7: Earth

Hope this helps :)

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How many moles of calcium chloride, cacl2, can be added to 1.5 l of 0.020 m potassium sulfate, k2so4, before a precipitate is ex
Brut [27]
When CaSO4 → Ca2+ + SO4
So when we have Ksp = [Ca2+][SO4]

when Ksp = 4.93 x 10^-5
and [SO4] = 0.02 M 
so by substitution we can get [Ca2+] 
4.93x10^-5 = [Ca2+] [0.02]
∴ [Ca2+] = 0.0025 mol/L

∴ the moles of calcium chloride = 0.0025 mol / L * 1.5 L
                                                      = 0.00167 mol

4 0
3 years ago
The observation that 20g of hydrogen gas always combines with 160g of oxygen gas to form 180g of water, even when there is more
mash [69]

Answer:

The answer is most likely A. Definite proportions

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The Law of Definite proportions states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.

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2 years ago
A substance made of two or more elements that have been chemically combined is a(n) ______.
RideAnS [48]
Compound (for example: H2O)
5 0
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2. What would happen if you added more than 5 mL of H2O2 to the 5 mL of yeast solution?
disa [49]

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The yeast present contains an enzyme called catalase which catalyses the reaction. More the amount of the catalyst added, faster will be the decomposition of the hydrogen peroxide.

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What region of the atom contains most of the atoms mass?
dimulka [17.4K]

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