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3 years ago

What is the pattern in the periodic table for valence electrons and orbital shells of an element?

Chemistry

2 answers:

IRISSAK [1]3 years ago

7 0

Answer:

Valence electrons increase as you go across the table (by periods)

Orbital Shells increase as you go down the table (rows)

bagirrra123 [75]3 years ago

6 0

The number of valence electrons is the same as the column that the element is in on the periodic table

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A student is asked to standardize a solution of potassium hydroxide. He weighs out 1.08 g potassium hydrogen phthalate (KHC8H4O4

natka813 [3]

Answer:

A. 0.143 M

B. 0.0523 M

Explanation:

Let's consider the neutralization reaction between potassium hydroxide and potassium hydrogen phthalate (KHP).

KOH + KHC₈H₄O₄ → H₂O + K₂C₈H₄O₄

The molar mass of KHP is 204.22 g/mol. The moles corresponding to 1.08 g are:

1.08 g × (1 mol/204.22 g) = 5.28 × 10⁻³ mol

The molar ratio of KOH to KHC₈H₄O₄ is 1:1. The reacting moles of KOH are 5.28 × 10⁻³ moles.

5.28 × 10⁻³ moles of KOH occupy a volume of 36.8 mL. The molarity of the KOH solution is:

M = 5.28 × 10⁻³ mol / 0.0368 L = 0.143 M

Let's consider the neutralization of potassium hydroxide and perchloric acid.

KOH + HClO₄ → KClO₄ + H₂O

When the molar ratio of acid (A) to base (B) is 1:1, we can use the following expression.

$M_{A} \times V_{A} = M_{B} \times V_{B}\\M_{A} = \frac{M_{B} \times V_{B}}{V_{A}} \\M_{A} = \frac{0.143 M \times 10.1mL}{27.6mL}\\M_{A} =0.0523 M$

8 0

3 years ago

How could you have used the color change property of iron (III) chloride to monitor when the reaction had reached completion?

Tresset [83]

What reaction are you referring to

7 0

3 years ago

What does H2O stand for?

yawa3891 [41]

Answer:

hydrogen and oxygen or water

Explanation:

2 oxygen 1 hydrogen H2O is the chemical formula of water

6 0

4 years ago

What mass, in grams, of bromine gas (Br2) is contained in a 15.7-liter tank at 24.6 degrees Celsius and 0.986 atmospheres? Show

Nezavi [6.7K]

PV = nRT

P is pressure, V is volume, n is number of moles, R is the gas constant, T is temperature in K

(2.85 atm)(12.5 L) = (n)(.08206)(27 C + 273)

n = 1.45 moles x 35.45 grams / mol Cl2 = 51.3 grams

4 0

3 years ago

Read 2 more answers

10. Johnny pushed a wheel borrow that was 50kg, if the net force on the

Semenov [28]

If you look at this question you can use the formula F/M= acceleration. The force over here is 15N and the mass is 50Kg. 15/50 is 0.3m/s^2. I hope that’s correct:)

5 0

3 years ago