3 years ago

The relative positions of protons, neutrons, and electrons in an atom

Chemistry

1 answer:

Dmitrij [34]3 years ago

7 0

Protons and neutrons are in the center
electrons orbit around the center/nucleus

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Iron(iii) oxide is formed when iron combines with oxygen in the air. How many moles of Fe2O3 are formed when 55.8 g or Fe reacts

iogann1982 [59]

Answer: The correct answer is Option B.

Explanation:

To calculate the number of moles, we use the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

<u>Moles of Iron</u>

Molar mass of iron = 55.8 g/mol

Given mass of iron = 558.8

Putting values in above equation, we get:

$Moles=\frac{55.8g}{55.8g/mol}=1mole$

For the given chemical equation:

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

By Stoichiometry,

4 moles of Iron produces 2 moles of Iron(III) oxide

So, 1 mole of Ion will produce = $\frac{2}{4}\times 1$ = 0.5 mole of Iron (III) oxide.

Hence, the correct answer is Option B.

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2 years ago

How do isobars help meteorologists predict weather?

asambeis [7]

The answer will be (B)

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A train travels 74 kilometers in 3 hours, and then 73 kilometers in 2 hours. What is its average speed? km/hr

nikitadnepr [17]

12km/Hr is the correct answer

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3 years ago

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What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic?

Alla [95]

Answer: B- Chemical bonds are formed. Energy is released in the form of heat.

Explanation: I hoped that helped !

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A sealed reaction vessel initially contains 1.113×10-2 moles of water vapor and 1.490×10-2 moles of CO(g).

Molodets [167]

Answer:

Kc = $\frac{[8.326x10-3]^{1} }{[1.113x10-2]^{1}[1.490x10-2]^{1} }$

Kc = 50.2059

Explanation:

1. Balance the equation

2. Use the Kc formula

Remember that pure substances, like H2 are not included on the Kc formula

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3 years ago