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2 years ago

What is the best definition of "thinking at the margin"? *

Chemistry

1 answer:

Cloud [144]2 years ago

5 0

Answer:

thinking about how to get the most out of a resource

you see thinking at the margin here means, to be thinking to do something out of what you are provided, i.e. to get most out of a resource

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Q3. A student added water to calcium oxide to make calcium hydroxide

galina1969 [7]

26.4 kg of calcium hydroxide (Ca(OH)₂)

Explanation:

We have the following chemical reaction:

CaO + H₂O → Ca(OH)₂

molecular weight of Ca(OH)₂ = atomic mass of Ca × number of Ca atoms + atomic mass of O × number of O atoms + atomic mass of H × number of H atoms

molecular weight of Ca(OH)₂ = 40 × 1 + 16 × 2 + 1 × 2 = 74 g/mole

molecular weight of CaO = atomic mass of Ca × number of Ca atoms + atomic mass of O × number of O atoms

molecular weight of CaO = 40 + 16 = 56 g/mole

number of moles = mass / molecular weight

number of moles of CaO = 20 / 56 = 0.357 kmoles

Taking in account the chemical reaction we devise the following reasoning:

if 1 kmole of CaO produces 1 kmole of Ca(OH)₂

then 0.357 kmoles of CaO produces X kmoles of Ca(OH)₂

X = (0.357 × 1) / 1 = 0.357 kmoles of Ca(OH)₂

mass = number of moles × molecular weight

mass of Ca(OH)₂ = 0.357 × 74 = 26.4 kg

Learn more about:

number of moles

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6 0

2 years ago

The energy that a log has is transformed when burned. How does the chemical energy of the log compare to the heat and light ener

Lubov Fominskaja [6]

I believe the correct answer from the choices listed above is the second option. The chemical energy of the log compare to the heat and light energy it is transformed into would be the <span>amount of chemical energy is less than the amount of heat and light energy. </span>

8 0

3 years ago

HCl + NaOH mc004-1.jpg NaCl + H2O Which substances are the reactants?

LiRa [457]

It depends on where your yields sign is, but usually it's the elements/ compounds in the front. In this case, HCL and NaOH

7 0

2 years ago

6 Which substances have atoms of the same element but different molecular structures?

Bezzdna [24]

Well you want the answer with the same letter in it. A.k.a 2. This means they have the same element in them
O2 (Diatomic oxygen that we breathe) and O3 (Ozone that would be deadly to breathe) have different structures.
So the answer is 2

8 0

2 years ago

What bond forms from an unequal sharing of electrons between atoms in a molecule? a nonpolar covalent bond a hydrophobic interac

love history [14]

Sharing of electrons always means its a covalent bond, and unequal means it is polar, so it is a polar covalent bond

7 0

3 years ago