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3 years ago

What does the atomic number of an element tell you?

Chemistry

1 answer:

stiv31 [10]3 years ago

7 0

The atomic number of an element tells you the number of protons that an atom of the given element has.

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Bimetallic strip over a flame, the strip was straight. When she placed the bimetallic strip in the flame, the strip started

creativ13 [48]

Answer:

Explanation: Metal B contacted more rapidly then Metal A.

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3 years ago

The compound Lead(II) Nitrate reacts with potassium Iodide.

marshall27 [118]

Answer:

a) Pb(NO3)2 + 2KI ⇒ PbI2 + 2K(NO3)

ion that form the precipitate = Pb2+ and I-

Spectator ions = NO3. and K+

b) Pb 2+ + 2 I- ⇒ PbI2

Explanation:

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4 years ago

Pls help i'l mark you the brainlest

sergey [27]

Answer:it would be the third one

Explanation:all the others are true its asking for the one that isnt true it doesnt matter that they would be a little big and yes they are complex and kinda difficult but they would help out a lot so the third one is the answer

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3 years ago

the ph of a solution of HCl in water is found to be 2.50. what volume of water would you add to 1.00L of this solution to raise

morpeh [17]

Answer:

To raise the pH of the solution to 3.10 we have to add 2.34 L of water.

Explanation:

Given that the pH of the solution of HCl in water is 2.5. Here the solution’s pH is changing from 2.5 to 3.10 which means the acidic nature of the solution is decreasing here on dilution. $[H^+]$ ions contribute to a solution’s acidic nature and $[OH^-]$ contribute to a solution’s basic nature.

The equation connecting the concentration of $[H^+]$ and pH of a solution is pH= $-log[H^+]$

 $[H^+]= 10^(^-^p^H^)$ $[H^+]= 10^(^-^2^.^5^)=0.00316$ 

When the pH is $3.1 [H^+ ]= 10^(^-^3^.^1^)=0.000794$ 

On dilution the concentration of a solution decreases and volume increases.

 $M_1 V_1 = M_2 V_2$ 

 $0.00316 \times 1 = 0.000794 \times V_2$ 

 $V_2 = \frac{(0.00316 \times 1)}{0.000794} =3.24$ 

Volume of water to be added $=3.24-1$ 

 $=2.24L$ 

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3 years ago

After boiling a chicken in a stock pot, you let the chicken stock cool down and place it

KATRIN_1 [288]

Answer:

Chicken fat is in the shallowest area because, being hydrophobic and lipid content of chicken, it is the lowest density compound in the broth, therefore it rises and does not precipitate. All fats usually float in liquid media because their density is less than that of water.

On the other hand, the gelatin that forms in the boil of the chicken broth is a gelatinous compound that is very nutritionally rich, consisting of denatured proteins that leave the chicken undergoing aqueous coagulation.

Both do not mix and due to the difference in densities, but in order to dissociate it, it is convenient to use emulsifiers or by cryogenic methods where cold is applied and its division is better.

Explanation:

In liquid media such as chicken broth, or any broth, when proteins or foods that contain a large amount of fats and proteins are boiled, the fatty layer will always be the most superficial because it is the one with the lowest density, therefore, that denatured coagulated protein with water it will be the next layer and finally the solids such as bone or cartilage remains would be in the deepest area because they are the ones with the highest density.

Another method to dissociate these products is through enzymatic activity, throwing enzymes into the broth formed.

5 0

3 years ago