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2 years ago

Why is electroplating an example of chemical change?

Chemistry

1 answer:

wel2 years ago

7 0

Yes it is true elsectroplating is involves in chemical and physical change but all these is happened on surface of metal by action of the oxidation or reduction.

Chemical change gives by following process as :

Lot of energy of requires,

New substance formed,

And process is irriversiable .

e. g. Rusting of iron,

Photosynthesis,

Burring of kerosene,

Raising cake batter,

Frying egg.

All these examples Shows the chemical change.

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A chemist must prepare 300.0mL of nitric acid solution with a pH of 0.70 at 25°C. He will do this in three steps: Fill a 300.0mL

d1i1m1o1n [39]

<u>Answer:</u> The volume of concentrated solution required is 9.95 mL

<u>Explanation:</u>

To calculate the pH of the solution, we use the equation:

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

We are given:

pH = 0.70

Putting values in above equation, we get:

$0.70=-\log[H^+]$

$[H^+]=10^{-0.70}=0.199M$

1 mole of nitric acid produces 1 mole of hydrogen ions and 1 mole of nitrate ions.

Molarity of nitric acid = 0.199 M

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 nitric acid solution

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

We are given:

$M_1=7.0M\\V_1=?mL\\M_2=0.199M\\V_2=350mL$

Putting values in above equation, we get:

$7.0\times V_1=0.199\times 350.0\\\\V_1=\frac{0.199\times 350}{7.0}=9.95mL$

Hence, the volume of concentrated solution required is 9.95 mL

6 0

2 years ago

Answer the following questions as an example of physical or chemical property. (Ive answered the first 3 already)

natulia [17]

Physical properties is actually the measure of properties of a substance without producing any changes init. I.e colour, density melting and boling point. While chemical properties shows that either the specific substance will undergo the r/n or not.
So, gasoline is flammable is it’s chemical property.

5 0

2 years ago

The amount of radioactive carbon-14 in a sample is measured using a Geiger counter, which records each disintegration of an atom

sergij07 [2.7K]

Answer:

4121 years

Explanation:

From;

0.693/t1/2 = 2.303/t log No/N

t1/2= half life of the carbon-14

No= count rate of the living tissue

N= count rate of the sample

t = age of the sample

0.693/5730 =2.303/t log (13.5/8.2)

1.21 * 10^-4 = 2.303/t * 0.2165

1.21 * 10^-4 = 0.4986/t

t = 0.4986/1.21 * 10^-4

t = 4121 years

7 0

2 years ago

How many moles are in 20 grams of O₂ gas?

Dima020 [189]

20 g O2 x 1 mol O2/32 g O = 0.625 mol O2

4 0

2 years ago

Although a scientific theory is well supported and widely accepted, what might cause it to change? HELPPP

ASHA 777 [7]

Although a scientific theories will support and wildly excepted, what might cause of the change?

the answer would be A, New Evidence.

8 0

2 years ago