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3 years ago

CHEM HELP PLSSSSS, I SUCK AT CHEM

Chemistry

1 answer:

maks197457 [2]3 years ago

5 0

Answer:

The answer to your question is because of surface tension

Explanation:

Surface tension is defined as the property of the surface of a liquid that allows it to resists an external force.

From the definition, we conclude that the molecules at the surface of water are extremely close and do not allow certain bugs to penetrate it so they can walk through it.

While the molecules at the surface of octane are not as close as those molecules in water so a bug sinks on it.

In conclusion, the surface tension of water is higher than the surface tension in octane.

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A 5.000 g mixture contains strontium nitrate and potassium bromide. Excess lead(II) nitrate solution is added to precipitate out

scZoUnD [109]

Answer: The mass percent of potassium bromide in the mixture is 9.996%

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For lead (II) bromide:

Given mass of lead (II) bromide = 0.7822 g

Molar mass of lead (II) bromide = 367 g/mol

Putting values in equation 1, we get:

$\text{Moles of lead (II) bromide}=\frac{0.7822g}{367g/mol}=0.0021mol$

The chemical equation for the reaction of lead (II) nitrate and potassium bromide follows:

$2KBr+Pb(NO_3)_2\rightarrow PbBr_2+2KNO_3$

By Stoichiometry of the reaction:

1 mole of lead (II) bromide is produced from 2 moles of potassium bromide

So, 0.0021 moles of lead (II) bromide will be produced from = $\frac{2}{1}\times 0.0021=0.0042mol$ of potassium bromide

Now, calculating the mass of potassium bromide by using equation 1, we get:

Molar mass of KBr = 119 g/mol

Moles of KBr = 0.0042 moles

Putting values in equation 1, we get:

$0.0042mol=\frac{\text{Mass of KBr}}{119g/mol}\\\\\text{Mass of KBr}=0.4998g$

To calculate the percentage composition of KBr in the mixture, we use the equation:

$\%\text{ composition of KBr}=\frac{\text{Mass of KBr}}{\text{Mass of mixture}}\times 100$

Mass of mixture = 5.000 g

Mass of KBr = 0.4998 g

Putting values in above equation, we get:

$\%\text{ composition of KBr}=\frac{0.4998g}{5.000g}\times 100=9.996\%$

Hence, the percent by mass of KBr in the mixture is 9.996 %

5 0

3 years ago

A salt forms in the reaction of barium with chlorine. What is the most likely formula unit of this salt?

Scrat [10]

The answer to this question would be: BaCl 2
Barium is an alkali metal with 56 atomic number. Barium located in the group 2 of the periodic table because it has 2 valence electrons. Chlorine is a nonmetal that has 1 valence electron. When react, it would need 2 chlorine for each barium as the valence electron of barium is twice the chlorine.

6 0

3 years ago

Read 2 more answers

Making models involves creating representations of complex objects or processes to help people study and understand things that

swat32

Somewhat false
observations can be made of a model of the statue of liberty, say, or in real line

6 0

3 years ago

Consider this reaction: KOH + HBr - KBr + H20 Which statement is most likely true about HBr?

Roman55 [17]

Answer: It turns blue litmus red

Explanation: