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NikAS [45]
3 years ago
10

Please help quickly! Real answers only!

Chemistry
1 answer:
igomit [66]3 years ago
5 0
It helps compare the application of electromagnetic wavelength
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How do valence electrons affect the properties of atoms?
Ymorist [56]
It determines the manner in which it develops bonds.... so, it affect ionization energy, electronegativity, metallic characteristic, formation of oxides etc.
6 0
3 years ago
How many formula units are in one mole of magnesium hydroxide?
svet-max [94.6K]

Answer:1 grams Magnesium Hydroxide is equal to 0.017146870490373 mole.

Explanation:The molecular formula for Magnesium Hydroxide is Mg(OH)2. The SI base unit for amount of substance is the mole.

7 0
3 years ago
I need help with this question
Maru [420]

Aluminum sulfide : Al₂S₃

ratio cation : anion = 2 : 3

<h3>Further explanation</h3>

Given

Compound of Aluminium

Required

cations anions ratio

Solution

Salt can be formed from cations and anions which have their respective charges.

In the chemical compound formula these charges are crossed with each other

For aluminum it has a +3 charge

1. Aluminum carbide : Al₄C₃

ratio cation : anion = 4 : 3

2. Aluminum chloride : AlCl₃

ratio cation : anion = 1 : 3

3. Aluminum sulfide : Al₂S₃

ratio cation : anion = 2 : 3

4. Aluminum nitride : AlN

ratio cation : anion = 1 : 1

3 0
2 years ago
Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unw
Sauron [17]

Answer:

0.1472 mol/L is the concentration of the barium hydroxide solution.

Explanation:

2KHC_8H_4O_4+Ba(OH)_2\rightarrow Ba(KC_8H_4O_4)_2+2H_2O

Mass of potassium hydrogen phthalate = 2.050 g

Molar mass of potassium hydrogen phthalate = \frac{2.050 g}{204.2 g/mol}=0.01004 mol

According to reaction , 2 moles of potassium hydrogen phthalate reacts with 1 mole of barium hydroxide, then 0.01004 moles of potassium hydrogen phthalate will :

\frac{1}{2}\times 0.01004 mol=0.005020 mol of barium hydroxide

Moles of barium hydroxide = 0.005020 mol

Volume of the barium hydroxide solution = 34.10 mL = 0.03410 L

1 mL = 0.001 L

Molarity=\frac{Moles}{Volume(L)}

Molarity of the barium hydroxiude silution :

=\frac{0.005020 mol}{0.03410 L}=0.1472 mol/L

0.1472 mol/L is the concentration of the barium hydroxide solution.

4 0
2 years ago
Mg(s) + ½O2(g) → MgO(s) + 146 kcal/mole H2(g) + ½O2(g) → H2O(g), ΔH = -57.82 kcal/mole What type of reaction is represented by t
adell [148]
Answer is: both reactions are exothermic.

<span>In exothermic reactions, heat is released and enthalpy of reaction is less than zero (as it show second chemical reaction).
According to Le Chatelier's principle when the reaction is <span>exothermic heat is included as a product (as it show first chemical reaction).</span></span>
7 0
3 years ago
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