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4 years ago

How many dots belong in the electron dot diagram of a boron (B) atom?

Chemistry

2 answers:

Contact [7]4 years ago

8 0

There are three dots in a boron atom.

Pachacha [2.7K]4 years ago

5 0

Answer:

There are three dots in the Lewis dot diagram of boron atom.

Explanation:

Boron is a chemical element that belongs to the group 13 and period 2 of the periodic table. It is a p-block element having atomic number 5.

The ground state electronic configuration of boron is 1s² 2s² 2p¹. So, in the ground state, the boron atom has 3 valence electrons in the valence shell.

The Lewis dot structure represents the number of valence electrons of an atom by dots.

Therefore, there are three dots in the Lewis dot diagram of boron atom.

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Which method is appropriate for separating a mixture of iron and aluminum? A. using a magnet B. distillation C. evaporation D. o

sladkih [1.3K]

Appropriate method for separating a mixture of iron and aluminum is definitely A. using a magnet. If we use the second method we will vaporize either aluminum or iron.
If we used the third method it would change liquid into a gas which is strange according to the task.
And observing (even for a long time) won't help separating.

7 0

3 years ago

Allison needs 18 liters of a 5% saline solution. She has a 1% solution and a 10% solution available. How many liters of the 1% s

kolezko [41]

Answer:

10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.

Explanation:

Let the volume of 1% acid solution used to make the mixture = x L

So, the volume of 10% acid solution used to make the mixture = y L

Total volume of the mixture = x + y = 18 L .................. (1)

For 1% acid solution:

C₁ = 1% , V₁ = x L

For 10% acid solution :

C₂ = 10% , V₂ = y L

For the resultant solution of sulfuric acid:

C₃ = 5% , V₃ = 18 L

Using

C₁V₁ + C₂V₂ = C₃V₃

1×x + 10×y = 5×18

So,

x + 10y = 90 .................. (2)

Solving 1 and 2 we get,

x = 10 L

y = 8 L

Thus,

10 liters of the 1% solution and 8 liters of the 10% solution she should mix to make the 5% solution.

7 0

3 years ago

What is the equilibrium constant expression for the reaction below? H2 (g) + I2 (g) → 2 HI(g)

brilliants [131]

<h3>Further explanation</h3>

Given

Reaction

H₂ (g) + I₂ (g) → 2HI(g)

Required

The equilibrium constant

Solution

The equilibrium constant is the value of the product in the equilibrium state of the substance in the right (product) divided by the substance in the left (reactant) with the exponents of each reaction coefficient

The equilibrium constant for reaction

pA + qB ⇒ mC + nD

$\large {\boxed {\bold {K ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}$