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White raven [17]
3 years ago
12

Is lithium a good or bad element? (explain why)

Chemistry
2 answers:
ddd [48]3 years ago
8 0

Answer:

Its good

Explanation:

It has power

Slav-nsk [51]3 years ago
8 0

Answer: The widespread occurrence of lithium in plants results in a wide, although low-level, distribution of lithium in animals. Lithium salts have complex effects when absorbed into the body. They are not highly toxic, although high levels can be fatal.

Explanation: Which means that lithium is a good element depending on levels.

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A quantity of 0.225 g of a metal M (molar mass = 27.0 g/mol) liberated 0.303 L of molecular hydrogen (measured at 17°C and 741 m
Lana71 [14]

Answer:

Oxide of M is M_2O_3 and sulfate of M_2(SO_4)_3

Explanation:

0.303 L of molecular hydrogen gas measured at 17°C and 741 mmHg.

Let moles of hydrogen gas be n.

Temperature of the gas ,T= 17°C =290 K

Pressure of the gas ,P= 741 mmHg= 0.9633 atm

Volume occupied by gas , V = 0.303 L

Using an ideal gas equation:

PV=nRT

n=\frac{PV}{RT}=\frac{0.9633 atm\times 0.303 L}{0.0821 atm L/mol K\times 290 K}=0.01225 mol

Moles of hydrogen gas produced = 0.01225 mol

2M+2xHCl\rightarrow 2MCl_x+xH_2

Moles of metal =\frac{0.225 g}{27.0 g/mol}=8.3333 mol

So, 8.3333 mol of metal M gives 0.01225 mol of hydrogen gas.

\frac{8.3333}{0.01225 mol}=\frac{2}{x}

x = 2.9 ≈ 3

2M+6HCl\rightarrow 2MCl_3+3H_2

MCl_3\rightarrow M^{3+}+Cl^-

Formulas for the oxide and sulfate of M will be:

Oxide of M is M_2O_3 and sulfate of M_2(SO_4)_3.

3 0
4 years ago
HELPPPPPP PLZZZZZ! FILE ATTACHED BELOW! ASAP PLZZZ!
baherus [9]
90 would be my guess.

4 0
4 years ago
The solubility of two slightly soluble salts of M^2+ , MA and MZ_2, are the same, 4 x 10^â4 mol/L.
LekaFEV [45]

Answer:

a) MZ₂

b) They have the same concentration

c) 4x10⁻⁴ mol/L

Explanation:

a) The solubility (S) is the concentration of the salt that will be dissociated and form the ions in the solution, the solubility product constant (Kps) is the multiplication of the concentration of the ions elevated at their coefficients. The concentration of the ions depends on the stoichiometry and will be equivalent to S.

The salts solubilization reactions and their Kps values are:

MA(s) ⇄ M⁺²(aq) + A⁻²(aq) Kps = S*S = S²

MZ₂(aq) ⇄ M⁺²(aq) + 2Z⁻(aq) Kps = S*S² = S³

Thus, the Kps of MZ₂ has a larger value.

b) A saturated solution is a solution that has the maximum amount of salt dissolved, so, the concentration dissolved is solubility. As we can notice from the reactions, the concentration of M⁺² is the same for both salts.

c) The equilibrium will be not modified because the salts have the same solubility. So, let's suppose that the volume of each one is 1 L, so the number of moles of the cation in each one is 4x10⁻⁴ mol. The total number of moles is 8x10⁻⁴ mol, and the concentration is:

8x10⁻⁴ mol/2 L = 4x10⁻⁴ mol/L.

7 0
3 years ago
The gas pressure inside a high vacuum chamber is 0.000000132atm. Calculate the gas pressure in mmHg and torr. Round each of your
Bumek [7]

Answer:

The gas pressure in both mmHg and torr is 1.00 x10⁻⁴.

Explanation:

The standard atmosphere (1 atm) equals a pressure  of 760 mmHg, where mmHg represents the pressure exerted by a column of mercury  1 mm high. <u>The mmHg unit is also called the torr</u>, after the Italian scientist Evangelista  Torricelli, who invented the barometer. Thus,

1 torr = 1 mmHg  

and  

1 atm = 760 mmHg = 760 torr

Therefore, we do the following conversion:

1 atm ------------------- 760 mmHg

1.32x10⁻⁷ atm ------- x=  1.00 x10⁻⁴ mmHg (3 significant digits)

4 0
3 years ago
Read 2 more answers
Given a chemical equation, showing the dissociation of an acid in solution, be able to identify the "acid", the "base", the "con
Karo-lina-s [1.5K]

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory:

  • An acid is defined as a substance which looses donates protons and thus forming conjugate base
  • A base is defined as a substance which accepts protons and thus forming conjugate acid.

HA+H_2O\rightarrow A^-+H_3O^+

Suppose acid Ha is getting dissociated in its solution and after dissociation it donates its proton to water molecule and forms conjugate base. Where as water (acting as a base) accepts protons and forms conjugate acid.

HA = Acid

H_2O = Base

A^- = Conjugate base

H_3O^+ = Conjugate acid

For example:

H_2SO_4+2H_2O\rightarrow SO_4^{2-}+2H_3O^+

Sulfuric acid dissociating in its solution to form conjugate base and conjugate acid.

Sulfuric acid  = Acid

H_2O = Base

SO_^{2-} = Conjugate base

H_3O^+ = Conjugate acid

3 0
4 years ago
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