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3 years ago

What are the 2 main methods of combination of elements??

Chemistry

2 answers:

Reil [10]3 years ago

8 0

Answer:

to make them react to each other to form a compound

Explanation:

mark me as brainliest pls

serg [7]3 years ago

4 0

Answer:

An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.

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Enter your answer in the provided box. An industrial chemist studying bleaching and sterilizing prepares a hypochlorite buffer u

neonofarm [45]

Answer:

$\large \boxed{7.62}$

Explanation:

1. pH of original buffer

(a) Calculate pKₐ

$\text{p}K_{\text{a}} = -\log \left (K_{\text{a}} \right ) =-\log(2.9 \times 10^{-8}) = 7.54$

(b) Calculate the pH

We can use the Henderson-Hasselbalch equation to get the pH.

$\begin{array}{rcl}\text{pH} & = & \text{pK}_{\text{a}} + \log \left(\dfrac{[\text{A}^{-}]}{\text{[HA]}}\right )\\\\& = & 7.54 +\log \left(\dfrac{0.450}{0.450}\right )\\\\& = & 7.54 + \log1.00 \\ & = & 7.54 + 0.00\\& = & 7.54\\\end{array}$

2. pH after adding strong base

(a) Find new composition of the buffer

The base reacts with the HA and forms A⁻

$\text{ Initial moles of HA} = \text{1.0 L} \times \dfrac{\text{0.450 mol }}{\text{1.00 L}} = \text{0.450 mol = 450 mmol}\\\\\text{ Initial moles of A}^{-} = \text{1.0 L} \times \dfrac{\text{0.450 mol }}{\text{1.00 L}} = \text{0.450 mol = 450 mmol}\\\\\text{Moles of OH$^{-}$ added} = \text{40 mmol}$

HA + OH⁻ ⟶ A⁻ + H₂O

I/mmol: 450 40 450

C/mmol: -40 -40 40

E/mmol: 410 0 490

(b) Find the new pH

$\begin{array}{rcl}\text{pH} & = & \text{pK}_{\text{a}} + \log \left(\dfrac{[\text{A}^{-}]}{\text{[HA]}}\right )\\\\& = & 7.54 +\log \left(\dfrac{490}{410}\right )\\\\& = & 7.54 + \log1.195 \\& = & 7.54 +0.0774\\& = & \mathbf{7.62}\\\end{array}\\\text{The new pH is $\large \boxed{\textbf{7.62}}$}$

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4 years ago

Will marks brainly if it isn’t a copied answer!!!

Neporo4naja [7]

What kind of control like scientific?

5 0

3 years ago

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When is the mole ratio from a balanced chemical reaction not needed in a calculation

Mamont248 [21]

Answer:16

Explanation:

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Advocard [28]

Answer:

Explanation:

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4 years ago

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Answer:

B. Polar Easterlies

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3 years ago

What are the 2 main methods of combination of elements??​

What are the 2 main methods of combination of elements??