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3 years ago

9

Why do other elements need to bond with one another?

2 answers:

dlinn [17]3 years ago

8 0

Answer:

In order for that element to gain stability

Marysya12 [62]3 years ago

7 0

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it.

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Choose the balanced equation for the reaction. Au3+(aq) + Cu+(aq) → Au(s) + Cu2+(aq) Au(s) + Cu2+(aq) → Au3+(aq) + Cu+(aq) Au3+(

Rasek [7]

Answer:

Au3+(aq) + 3Cu+(aq) → Au(s) + 3Cu2+(aq)

1.35 V

Explanation:

Given that the reduction potential of

Cu^2+(aq) + e- -----> Cu^+(aq) is +0.15 V

While the reduction potential of

Au3+(aq) + 3 e- -----> Au(s) is + 1.50V

It is clear that the Cu^+(aq)/Cu^2+(aq) system is the anode while Au^3+(aq)/Au(s) system is the cathode based on the reduction potentials shown above. The number of electrons transferred (n) =3

E°cell = E°cathode - E°anode

E°cell= 1.50-0.15

E°cell= 1.35 V

3 0

3 years ago

A chemist must prepare 550 mL of hydrochloric acid solution with a pH of 1.60 at 25°C .

hammer [34]

<u>Answer:</u> The volume of concentrated hydrochloric acid solution is 1.73 mL

<u>Explanation:</u>

To calculate the hydrogen ion concentration of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

pH = 1.60

Putting values in above equation, we get:

$1.60=-\log [H^+]$

$[H^+]=10^{-1.60}=0.0251M$

To calculate the volume of the concentrated solution, we use the equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of the concentrated HCl solution

$M_2\text{ and }V_2$ are the molarity and volume of diluted HCl solution

We are given:

$M_1=8.0M\\V_1=?mL\\M_2=0.0251M\\V_2=550mL$

Putting values in above equation, we get:

$8.0\times V_1=0.0251\times 550.0\\\\V_1=\frac{0.0251\times 550}{8.0}=1.73mL$

Hence, the volume of concentrated hydrochloric acid solution is 1.73 mL

6 0

3 years ago

What is the final pH of a solution when 0.1 moles of acetic acid is added to water to a final volume of 1L?

kicyunya [14]

Answer:

The pH of solution is 2.88 .

Explanation:

The reaction is :

$CH_3COOH-->CH_3COO^-+H^+$

We know, $K_a$ for this reaction is = $1.76\times 10^{-5}.$

Also, since volume of water is 1 L.

Therefore, molarity of solution is equal to number of moles.

Also, $K_a=\dfrac{[CH_3COO^-][H^+]}{[CH_3COOH]}$

Let, amount of $CH_3COO^- and\ H^+$ produce is x.

So,

$K_a=\dfrac{[x][x]}{[0.1]}\\1.76\times 10^{-5}=\dfrac{[x][x]}{[0.1]}$

$x=0.0013\ mol.$

We know, $pH=-log{x}=-log(0.0013)=2.88$

Therefore, pH of solution is 2.88 .

Hence, this is the required solution.

5 0

3 years ago

Mengapa besi lebih dahulu ditemukan daripada natrium?

8_murik_8 [283]

Answer:

english? translate

Explanation:

please

6 0

3 years ago

What unit is used to express the average kinetic energy of a system

Elenna [48]

1.Joule
2.Kelvin
3.Gram
4.Meter

3 0

4 years ago