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3 years ago

The first part of a balanced chemical equation for a chemical reaction is shown below:

Chemistry

1 answer:

Bond [772]3 years ago

8 0

Answer:

The answer to your question is 6

Explanation:

Data

Cu + 2AgNO₃ ⇒

To find the answer, count the number of each element in the reactants

Element Quantity

Copper 1

Silver 2

Nitrogen 1

Oxygen 6

Then, in the products, there must be 6 oxygens so in the products there must be 6 oxygens so the reaction is balanced.

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Using the periodic table as a reference, which pair of elements are nonmetals?

mr_godi [17]

Answer:

Hello Friend, I've done my personal research, if the answer that's provided is incorrect, my apologies.

A. Oxygen and Sulfur.

Explanation: There are about 10 non metal elements on the periodic table. The pair (Oxygen and Sulfur) are both non metal.

5 0

3 years ago

A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.100 moles

alexgriva [62]

Answer : The pH of the solution is, 3.41

Explanation :

First we have to calculate the moles of $HF$ .

$\text{Moles of HF}=\text{Concentration of HF}\times \text{Volume of solution}$

$\text{Moles of HF}=0.250M\times 1.50L=0.375mol$

Now we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.8\times 10^{-4})$

$pK_a=4-\log (6.8)$

$pK_a=3.17$

The reaction will be:

$HF+OH^-\rightleftharpoons F^-+H_2O$

Initial moles 0.375 0.100 0.375

At eqm. (0.375-0.100) 0 (0.375+0.100)

= 0.275 = 0.475

Now we have to calculate the pH of solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[F^-]}{[HF]}$

Now put all the given values in this expression, we get:

$pH=3.17+\log [\frac{(\frac{0.475}{1.50})}{(\frac{0.275}{1.50})}]$

$pH=3.41$

Thus, the pH of the solution is, 3.41

8 0

3 years ago

The atoms in the diagram above are...

vichka [17]

Answer:

losing valence electrons

Explanation:

please Mark as BRAINLIST answer

5 0

3 years ago

8.45 cm - 3.55 cm = ?

lyudmila [28]

Answer:

4.9cm or 4.90cm

Explanation:

Use column method and align the numbers. Make sure you add the decimal point before you write the answer, otherwise the value would be wrong.

6 0

3 years ago

Read 2 more answers

What is the density of a substance that has a mass of 42.8 g and a volume of 2.0 cm^3?

Misha Larkins [42]

Answer:

21.4

Explanation:

Mass = M/V

42.8/2.0 = 21.4

7 0

3 years ago