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3 years ago

Why do some atoms form positive ions and others form negative ions?

1 answer:

8 0

It is energetically favorable for all atoms to have a complete outer electron shell. Loosely, the atoms on the left hand side of the periodic table only have a few extra electrons in their outer shell so it is energetically favorable for them to lose them. The atoms on the right hand side of the periodic table almost have enough electrons in their outer shell and so they have a tendency to gain them. Once electrons have left an electron shell, an atom will have a positive charge because it has more protons (positive charges) than electrons (negative charges). Similarly, an electron which has gained electrons to complete its outer shell will have a negative charge because it now has more electrons (negative charge) than protons (positive charge).

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When the pressure that a gas exerts on a sealed container changes from 1100 bar to 75.5 bar, the temperature changes from k to 2

Serjik [45]

Gay-Lussac's law gives the relationship between pressure and temperature of gas. For a fixed amount of gas, pressure is directly proportional to temperature at constant volume.
P/T = k
where P - pressure , T - temperature and k - constant
$\frac{P1}{T1} = \frac{P2}{T2}$
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
substituting the values in the equation
$\frac{1100 bar}{T} = \frac{75.5 bar}{298 K}$
T = 4342 K
initial temperature was 4342 K

7 0

4 years ago

K2so4 is a strong electrolyte. determine the concentration of each of the individual ions in a 0.450 m k2so4 solution.

amid [387]

Answer:

Conc. of K+ ions = 0.90 M
Coc. of SO4∧-2 = 0.45 M

Explanation:

Data Given:

Conc. of H2SO4 = 0.450

As sulphoric acid is a strong electrolyte, it completely dissociate into ions.

H2SO4 ⇆ 2K+ + SO4∧-2

.450 M K2SO4 means that there is .450 mols of K2SO4 in every liter of solution.

K2SO4 : K+ K2SO4 : SO4∧-2

1 = 2 1 = 1

0.450 = 2× 0.450 = 0.90 0.450 = 0.450×1 = 0.450

Result:

Conc. of potassium ion will be 0.90M

Coc. of sulphate ions will be 0.45 M

8 0

3 years ago

Select the single best answer. Predict the pH (> 7, < 7, or = 7) of a LiHCO3 solution.

tiny-mole [99]

Answer:

LiHCO3 its PH >7

Explanation:

the real ph for it is 11.3 so it makes it more than 7

and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base

4 0

4 years ago

Forensic biologist Manning is looking at a cell sample under the microscope. The cell she sees is oval, with a long tail or flag

Gre4nikov [31]

Answer:

Sperm Cell

Explanation:

8 0

3 years ago

How many valence electrons does this atom have? (Urgent)

serg [7]

Answer:

For example, atoms in Groups 1 and 2 have 1 and 2 valence electrons, respectively. Atoms in Groups 13 and 18 have 3 and 8 valence electrons, respectively. Valence electrons are responsible for the reactivity of an element. They determine how "willing" the elements are to bond with each other to form new compounds.

Explanation: it might be 18 my guess:)

4 0

3 years ago