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4 years ago

What is the valence of

Chemistry

1 answer:

Yakvenalex [24]4 years ago

4 0

Yo sup??

$CO_3^2^-$ has a net charge of -2

Therefore the valency of $CO_3^2^-$ is -2

Hope this helps.

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According to the ____________________, when a physical or chemical change occurs, no atoms are created or destroyed.

solong [7]

Law of conservation of mass

7 0

3 years ago

What is the chemical equation from table salt made from baking soda

bagirrra123 [75]

NaHCO₃ + HCl → NaCl + H₂O + CO₂

Explanation:

NaHCO₃ + HCl → NaCl + H₂O + CO₂

When Sodium bi carbonate (NaHCO₃) reacts with hydrochloric acid (HCl), it forms table salt (NaCl), water ( H₂O ) and Carbon di oxide (CO₂) gas is evolved.

Here base reacts with acid to form salt and it is the neutralization reaction.

7 0

4 years ago

A student has 100. mL of 0.400 M CuSO4(aq) and is asked to make 100. mL of 0.150 M CuSO4(aq) for a spectrophotometry experiment.

ValentinkaMS [17]

Answer:

a. 37.5 mL

b. See the description below

Explanation:

a. Volume of 0.400 M CuSO₄(aq) required for the preparation

In dissolutions, since the number of moles of solute is constant, the equation is:

$C_1\times V_1=C_2\times V_2$

Substitute and solve for V₁

$0.400M\times V_1=0.150M\times 100ml$

$V_1=0.150M\times 100.ml/0.400M=37.5ml$

b. Briefly describe the essential steps to most accurately prepare the 0.150 M CuSO₄(aq) from the 0.400 M CuSO₄(aq)

You will use the stock solution, the funnel, the buret, and distilled water.

i) Using the funnel, fill in the buret with with 50 ml of the stock solution, i.e. the 100. ml of 0.400 M CuSO₄(aq) solution.

ii) Pour 37.5 ml of the stock solution from the burete into the volumetric flask.

iii) Carefully add disitlled water to the 37.5ml of the stock solution in the volumetric flask until the mark (50 ml) on the volumetric flask.

iv) Put the stopper and rotate the volumetric flask to homegenize the solution.

3 0

4 years ago

How does a smoke detector utilize radiation?

Schach [20]

D. Beta radiation ionizes the air. When smoke
interacts with the ionized particles it causes the
alarm to sound.

5 0

3 years ago

Aluminum sulfate reacts with barium chloride to form the insoluble compound, barium sulfate. The reaction proceeds according to

Kaylis [27]

Answer: $BaCl_2$ is the limiting reagent and $Al_2(SO_4)_3$ is the excess reagent.

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of aluminium sulphate}=\frac{150g}{342.15g/mol}=0.438moles$

$\text{Moles of barium chloride}=\frac{200g}{208.23g/mol}=0.960moles$

The balanced chemical reaction is:

$Al_2(SO_4)_3+3BaCl_2\rightarrow 2AlCl_3+3BaSO_4$

According to stoichiometry :

3 moles of $BaCl_2$ require = 1 mole of $Al_2(SO_4)_3$

Thus 0.960 moles of $BaCl_2$ will require= $\frac{1}{3}\times 0.960=0.320moles$ of $Al_2(SO_4)_3$

Thus $BaCl_2$ is the limiting reagent as it limits the formation of product and $Al_2(SO_4)_3$ is the excess reagent as it is left.

4 0

3 years ago