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3 years ago

Complete the sentence.

Chemistry

2 answers:

vichka [17]3 years ago

6 0

Answer:

Reflects :) yw folks

scoray [572]3 years ago

5 0

Answer:

reflects

Explanation:

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Can someone summarize the concept of Chemical bonding and counting atoms in an equation?

IRINA_888 [86]

You need to have 8 electrons to fill an atom and to fill bond the pairs need to equal 8

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4 years ago

A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as b

AnnyKZ [126]

Answer : The mass percentage of barium in the compound is, 53.8 %

Explanation : Given,

Mass of barium compound = 441 mg

Mass of barium sulfate = 403 mg = 0.403 g (1 mg = 0.001 g)

The balanced chemical reaction will be:

$Ba^{2+}(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2Na^+(aq)$

First we have to calculate the moles of $BaSO_4$

$\text{Moles of }BaSO_4=\frac{\text{Mass of }BaSO_4}{\text{Molar mass of }BaSO_4}$

Molar mass of $BaSO_4$ = 233.38 g/mole

$\text{Moles of }BaSO_4=\frac{0.403g}{233.38g/mole}=0.001727mole$

Now we have to calculate the moles of barium ion.

From the balanced chemical reaction, we conclude that

As, 1 mole of barium sulfate produced from 1 mole of barium ion

So, 0.001727 mole of barium sulfate produced from 0.001727 mole of barium ion

Now we have to calculate the mass of barium ion.

$\text{ Mass of }Ba^{2+}=\text{ Moles of }Ba^{2+}\times \text{ Molar mass of }Ba^{2+}$

Molar mass of barium = 137.3 g/mol

$\text{ Mass of }Ba^{2+}=(0.001727moles)\times (137.3g/mole)=0.2371g$

Now we convert the mass of barium ion from gram to mg.

Conversion used : (1 g = 1000 mg)

Mass of barium ion = 0.2371 g = 237.1 mg

Now we have to calculate the mass percentage of barium in the compound.

Mass percent of barium = $\frac{237.1mg}{441mg}\times 100=53.8\%$

Thus, the mass percentage of barium in the compound is, 53.8 %

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4 years ago

What organelle is found in paramecia cell but not plant cells

Sliva [168]

The correct answer is Contractile Vacoules

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3 years ago

If the lead concentration in water is 1 ppm, then we should be able to recover 1 mg of lead from _____ L of water.

Aliun [14]

Answer:

1 L

Explanation:

ppm means parts per million. Generally the relationship between mass and litre is given as;

1 ppm = 1 mg/L

This means that 1 ppm is equivalent to 1 mg of a substance dissolved in 1 L of water.

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4 years ago

Why would a high speed collision cause more damage than a low speed collision?

svlad2 [7]

Explain why a high speed collision between two cars would cause more damage than a low-speed collision between the same two cars. The more mass and speed and object has, the greater its kinetic energy. ... At lower speeds, the kinetic energy is less, so the impact would be less and there would be less damage.

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3 years ago

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