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3 years ago

Which ion is a cation? A. Ca2+ B. Cl2 C. S2- D. Br-

Chemistry

1 answer:

wolverine [178]3 years ago

7 0

Answer:

Ca2+ is cation

Explanation:

Because cation contain positive charge.

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Tính khối lượng H2SO4 có trong 50ml dung dịch H2SO4 2M.

podryga [215]

Answer:

$50ml=0,05l\\n_H_2SO_4=2.0,05=0,1mol\\mH_2SO_4=0,1.98=9,8g$

Explanation:

8 0

2 years ago

When doing a recrystallization what observations would prompt

Volgvan

<h2>Observation of purified crystals.</h2>

Explanation:

Recrystallization is the process in which a compound is dissolved in a hot solvent and then allowed to cool which forms the crystals.
It is a technique used for purification of solids.
Recrystallization mainly depends on the solubility of the solvent that means the solid should be soluble in the solvent when it is hot and should be insoluble in the same solvent when it is cool.
The observations while doing recrystallization is to observe the purified crystals obtained and to filter it out.

5 0

3 years ago

The equilibrium constant for the reaction

FinnZ [79.3K]

Answer: The concentrations of $Cl_2$ at equilibrium is 0.023 M

Explanation:

Moles of $Cl_2$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{10g}{71g/mol}=0.14mol$

Volume of solution = 1 L

Initial concentration of $Cl_2$ = $\frac{0.14mol}{1L}=0.14M$

The given balanced equilibrium reaction is,

$COCl_2(g)\rightleftharpoons CO(g)+Cl_2(g)$

Initial conc. 0.14 M 0 M 0M

At eqm. conc. (0.14-x) M (x) M (x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[CO]\times [Cl_2]}{[COCl_2]}$

Now put all the given values in this expression, we get :

$4.63\times 10^{-3}=\frac{x)^2}{(0.14-x)}$

By solving the term 'x', we get :

x = 0.023 M

Thus, the concentrations of $Cl_2$ at equilibrium is 0.023 M

7 0

3 years ago

The law of multiple proportions accounts for which of the following?

castortr0y [4]

Answer is: b) subscripts in chemical formulas.
Law of multiple proportions is also called Dalton's Law.
John Dalton (1766 – 1844) was an English chemist and physicist.
Ratios of the masses of elements combine as ratios of small whole numbers. This is basic for writing down chemical formulas for compounds.

6 0

3 years ago

Describe the error (what rule does it violate) if there is one in each of the following:

Free_Kalibri [48]

Answer:

prolly the gay one

Explanation:

4 0

3 years ago