A baseline for experimental investigation is provided by an hypothesis. This is a must before conducting experiments. Also, it is the hypothesis that is being proved by doing the experiments. So, hypothesis is very important in research studies. Hope this answers the question.
298 g of calcium carbonate CaCO₃
Explanation:
We have the following chemical reaction:
CaCN₂ (s) + 3 H₂O (l) → CaCO₃ (s)+ 2 NH₃ (g)
number of moles = mass / molar weight
number of moles of H₂O = 161 / 18 = 8.94 moles
Knowing the chemical reaction we devise the following reasoning:
if 3 moles of H₂O produces 1 mole of CaCO₃
then 8.94 moles of H₂O produces X moles of CaCO₃
X = (8.94 × 1) / 3 = 2.98 moles of CaCO₃
mass = number of moles × molar weight
mass of CaCO₃ = 2.98 × 100 = 298 g
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number of moles
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Answer:
a
. eight tenths of her cookies
Explanation:
Let the total number of Lakesha's cookies be represented by x.
So that;
She gave three tenths to Bailey =
of x
= ![\frac{3x}{10}](https://tex.z-dn.net/?f=%5Cfrac%7B3x%7D%7B10%7D)
She gave five tenths to Helen =
of x
= ![\frac{5x}{10}](https://tex.z-dn.net/?f=%5Cfrac%7B5x%7D%7B10%7D)
Fraction of Lakesha's cookies given away =
+ ![\frac{5x}{10}](https://tex.z-dn.net/?f=%5Cfrac%7B5x%7D%7B10%7D)
= ![\frac{3x+ 5x}{10}](https://tex.z-dn.net/?f=%5Cfrac%7B3x%2B%205x%7D%7B10%7D)
= ![\frac{8x}{10}](https://tex.z-dn.net/?f=%5Cfrac%7B8x%7D%7B10%7D)
Thus, the fraction of cookies given away by Lakesha is
.
Hello!
Your answer is A, asthenosphere
<u>The asthenosphere is a part of the mantle</u>. It helps move the plates in the Earth.
It is <u>below the lithosphere,</u> between <u>80 and 200 km</u> below the surface.
Therfore, the asthenosphere is <u>the part of the mantle that is still a solid but flows like a thick, heavy liquid.</u>
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Hope this helps!
Have a great day!
Answer:
Explanation:
phosphorus belongs to group 5 of the periodic table because it has 5 electron in its outermost shell the number of electron in the outermost shell of electron determine the group of the element in the periodic table