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BlackZzzverrR [31]
2 years ago
7

What are some of the body's internal defenses

Chemistry
2 answers:
Amanda [17]2 years ago
5 0
What are some of the body's internal defenses. The skin helps protect stuff to!
Tcecarenko [31]2 years ago
4 0
The immune system helps prevent diseases
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V125BC [204]

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third one

Explanation:

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What's the mass if a nickel
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<span>58.6934 +/- 0.0002 u</span>
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Select the correct answer.
Karo-lina-s [1.5K]

Answer: OB

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The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .

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noble gases are used in many situations where a safe and constant environment must be maintained. for example, helium is used to
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Noble gases have a complete valence electron shell making them stable and nonreactive.

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2 years ago
Consider the following chemical reaction: 2KCl + 3O2 --&gt; 2KClO3. If you are given 100.0 moles of KCl and 100.0 moles of O2...
g100num [7]

Answer:

O₂; KCl; 33.3  

Explanation:

We are given the moles of two reactants, so this is a limiting reactant problem.

We know that we will need moles, so, lets assemble all the data in one place.

            2KCl  +  3O₂ ⟶ 2KClO₃

n/mol:  100.0   100.0

1. Identify the limiting reactant

(a) Calculate the moles of KClO₃ that can be formed from each reactant

(i)From KCl

\text{Moles of KClO}_{3} = \text{100.0 mol KCl} \times \dfrac{\text{2 mol KClO}_{3}}{\text{2 mol KCl}} = \text{100.0 mol KClO}_{3}

(ii) From O₂

\text{Moles of KClO}_{3} = \text{100.0 mol O}_{2} \times \dfrac{\text{2 mol KClO}_{3}}{\text{3 mol O}_{2}} = \text{66.67 mol KClO}_{3}

O₂ is the limiting reactant, because it forms fewer moles of the KClO₃.

KClO₃ is the excess reactant.

2. Moles of KCl left over

(a) Moles of KCl used

\text{Moles used} = \text{100.0 mol O}_{2} \times \dfrac{\text{2 mol KCl}}{\text{3 mol O}_{2}} = \text{66.67 mol KCl}

(b) Moles of KCl left over

n = 100.0 mol - 66.67 mol = 33.3 mol

3 0
3 years ago
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