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3 years ago

Which electrons participate in chemical bonding?

Chemistry

2 answers:

OverLord2011 [107]3 years ago

7 0

B.) Valence Electrons. The nucleus of the valence electrons attracts and pulls atoms together.

VMariaS [17]3 years ago

4 0

Answer:

Explanation:

I took the test

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Sprinter set in starting blocks at the beginning of a race rely on what kind of energy conversion

ale4655 [162]

They convert chemical potential energy (stored in muscle cells) to kinetic energy (running)

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3 years ago

A 5.00 gram sample of magnesium sulfate hydrate (epsom salt) is heated in the lab to form anhydrous magnesium sulfate. After hea

Ostrovityanka [42]

Answer:

The answer to your question is MgSO₄ 5H₂O

Explanation:

Data

mass of MgSO₄ = 2.86 g

mass of H₂O = 2.14 g (5 - 2.86)

Process

1.- Calculate the molecular mass of the compounds

MgSO₄ = 24 + 32 + (16 x 4) = 120

H₂O = 16 + 2 = 18

2.- Convert the grams obtain to moles

120 g of MgSO₄ --------------- 1 mol

2.8 g ---------------- x

x = (2.8 x 1)/120

x = 0.024 moles

18 g of H₂O --------------------- 1 mol

2.14 g -------------------- x

x = (2.14 x 1)/18

x = 0.119

3.- Divide by the lowest number of moles

MgSO₄ = 0.024/0.024 = 1

H₂O = 0.119/ 0.024 = 5

4.- Write the molecular formula

MgSO₄5H₂O

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3 years ago

How many grams of carbon monoxide are needed to react with an excess of iron (III) oxide to produce 198.5 grams of iron? Fe2O3(s

erastova [34]

Answer : The grams of carbon monoxide needed are 148.89 g

Solution : Given,

Mass of iron, Fe = 198.5 g

Molar mass of iron, Fe = 56 g/mole

Molar mass of carbon monoxide, CO = 28 g/mole

First we have to calculate the moles of iron, Fe.

$\text{ Moles of Fe}=\frac{\text{ Mass of Fe}}{\text{ Molar mass of Fe}}=\frac{198.5g}{56g/mole}=3.545moles$

The balanced chemical reaction is,

$Fe_2O_3(s)+3CO(g)\rightarrow 3CO_2(g)+2Fe(s)$

From the balanced reaction, we conclude that

2 moles of iron produces from the 3 moles of carbon monoxide

3.545 moles of iron produces from the $\frac{3}{2}\times 3.545=5.3175$ moles of carbon monoxide

Now we have to calculate the mass of carbon monoxide, CO.

$\text{ Mass of CO}=\text{ Moles of CO}\times \text{ Molar mass of CO}$

$\text{ Mass of CO}=(5.3175moles)\times (28g/mole)=148.89g$

Therefore, the grams of carbon monoxide needed are 148.89 g

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3 years ago

Why do you think there was a rush to mass-produce penicillin around the time of World War II?

Vladimir79 [104]

Answer:

penicillin could protect mice against infection from deadly Streptococci.

Explanation:

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3 years ago

Read 2 more answers

Chlorophyll a is one of the green pigments found in plants. Chlorophyll a has the molecular formula C55H72MgN4O5. How many atoms

algol13

The number of atoms in a molecule can be calculated by adding all of the number of elements from the chemical formula. For chlorophyll, the chemical formula would be <span>C55H72MgN4O5 adding all the elements we have 137 atoms. Hope this answers the question.</span>

8 0

3 years ago