All categories

4 years ago

As the atomic number increases in Group 17, there is an increase in -

1 answer:

7 0

Answer:The number of valence electrons in an atom increases down the group due to the increase in energy levels at progressively lower levels. The electrons are progressively further from the nucleus; therefore, the nucleus and the electrons are not as attracted to each other. An increase in shielding is observed.

Explanation: Read this and you'll find your answer~! I hope i helped you~! Have an GREAT day~! <\3

You might be interested in

What causes blood cells to shrink?

Sholpan [36]

Answer:

iron deficiency (anaemia)

Explanation:

when there is lack of iron it causes anaemia

7 0

3 years ago

Read 2 more answers

Gastric juice (pH 1.5) is produced by pumping HCl from blood plasma (pH 7.4) into the stomach. Calculate the amount of free ener

Annette [7]

Given question is incomplete. The complete question is as follows.

Gastric juice (pH 1.5) is produced by pumping HCl from blood plasma (pH 7.4) into the stomach. Calculate the amount of free energy required to concentrate the H in 1 liter of gastric juice at 37 degree of centigrade. Under cellular conditions, how many moles of ATP must be hydrolyzed to provide this amount of free energy? the free energy change for ATP hydrolysis under cellular conditions is about -58 kJ/mol. Ignore the effects of the transmembrane electrical potential.

Explanation:

The given data is as follows.

Gastric juice pH = 1.5, blood plasma pH = 7.4

Temperature = $37^{o}C$ = (37 + 273) K

= 310 K

Now, relation between pH and concentration of hydrogen ions is as follows.

pH = $-log [H^{+}]$

At pH = 1.5, we will calculate the $[H^{+}]$ as follows.

$[H^{+}] = 10^{-pH}$

= $10^{-1.5}$

= $3.16 \times 10^{-2}$ M ( $C_{2}$ )

At pH = 7.4, we will calculate the $[H^{+}]$ as follows.

$[H^{+}] = 10^{-pH}$

= $10^{-7.4}$

= $3.98 \times 10^{-8}$ M ( $C_{1}$ )

Also,

$\Delta G_{f} = RT ln (\frac{C_{2}}{C_{1}})$

= $8.314 \times 310 \times ln (\frac{3.16 \times 10^{-2}}{3.98 \times 10^{-8}})$

= 35 kJ/mol

So, the amount of ATP necessary to provide 35 kJ is as follows.

$\frac{35 kJ}{58 kJ/mol}$

= 0.6 mol

Therefore, we can conclude that 0.6 moles of ATP must be hydrolyzed to provide this amount of free energy.

7 0

4 years ago

No question mmmmmmmmmmmmmmmmmmmmmmmmm

tatiyna

So this isn’t a question ?

5 0

4 years ago

1. What does the Law of conservation of mass state?

kakasveta [241]

Answer:

According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.

4 0

3 years ago

An elements had three isotopes, determine the average atomic mass and

Kryger [21]

Answer:

126.86

Explanation:

Given parameters:

1x - percent abundance = 80%(0.8), mass = 127

2x - percent abundance = 17%(0.17), mass = 126

3x - percent abundance = 3%(0.03) , mass = 128

Unknown:

Average atomic mass = ?

Solution:

The average atomic mass is the average of all isotopes of element. It can be calculated using the expression below;

RAM = (mass x abundance of 1x) + (mass x abundance of 2x) + (mass x abundance of 3x)

Now insert the parameters and solve;

RAM = (127 x 0.8) + (126 x 0.17) + (128 x 0.03) = 126.86

3 0

3 years ago