All categories

3 years ago

What does each of the facts shown above tell you about the element on the periodic table

1 answer:

7 0

<span>The atomic number of a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element, It can be used to determining which group the element belongs to in the periodic table. Therefore, atomic number is the correct answer.</span>

You might be interested in

Butanoic acid + 1-pentanol

lutik1710 [3]

Answer: X is an Esther

Explanation: alcohol and carboxylate acid forms esters

7 0

3 years ago

How many liters of salt solution will be needed to provide 15 grams of salt if the concentration of the solution is 50 g/l?

asambeis [7]

Answer:

.30 l

Explanation:

15g/50g/l= .3l

6 0

3 years ago

Approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?

skelet666 [1.2K]

I’m pretty sure it is 25 % :))

4 0

3 years ago

A phosphate buffer is involved in the formation of urine. The developing urine contains H2PO4 and HPO42- in the same concentrati

Katen [24]

Answer:

The ionization equation is

$H_{2}PO_{4}^{-} +H_{2}O$ ⇄ $HPO_{4}^{-2} +H_{3}O^{+}$ (1)

Explanation:

The ionization equation is

$H_{2}PO_{4}^{-} +H_{2}O$ ⇄ $HPO_{4}^{-2} +H_{3}O^{+}$ (1)

As the Bronsted definition sais, an acid is a substance with the ability to give protons thus, H2PO4 is the acid and HPO42- is the conjugate base.

The Ka expression is the ratio between the concentration of products and reactants of the equilibrium reaction so,

$Ka = \frac{[HPO_{4}^{-2}] [H_{3}O^{+}]}{[H_{2}PO_{4}^{-}] [H_{2}O]} = 6.2x10^{-8}$

The pKa is

$-Log (Ka) = -Log (6.2x10^{-8}) = 7.2$

The pKa of H2CO3 is 6,35, thus this a stronger acid than H2PO4. The higher the pKa of an acid greater the capacity to donate protons.

In the body H2CO3 is a more optimal buffer for regulating pH due to the combination of the two acid-base equilibriums and the two pKa.

If the urine is acidified, according to Le Chatlier's Principle the equilibrium (1) moves to the left neutralizing the excess proton concentration.

3 0

4 years ago

Imagine that you combine lemon juice with baking soda in a glass. You see gas bubbles forming along the sides of the glass. How

olasank [31]

<span>The gas that is formed is a different state of matter from the baking soda and lemon juice. The lemon juice has a different odor or smell than the gas. There is no color in the gas, while the lemon juice is yellow, and the baking soda is white.
^^^^^ hope this helps you! :) </span>

6 0

4 years ago

Read 2 more answers