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4 years ago

If one body is positively charged and another one is negatively charged free electrons tend to ?

2 answers:

8 0

Free electrons tend to move from the negatively charged body to the positively charged body. Static electricity or shock may also occur

lord [1]4 years ago

5 0

Answer is: Move from the negatively charged body to the positively charged body.

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

The proton (p⁺) is subatomic particle with a positive electric charge of +1e elementary charge.

Opposite charges (positive and negative) attract one another.

The negatively charged body has extra electrons, more electrons than protons.

The positively charged body has less electrons than protons.

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An aqueous solution is listed as being 33.8% solute by mass with a density of 1.15 g/mL, the molar mass of the solute is 145.6 g

vodomira [7]

Answer:

A) 2.69 M

B) 0.059

Explanation:

A) We have:

33.8% solute by mass= 33.8 g solute/100 g solution

molarity = mol solute/ 1 L solution

molarity= $\frac{33.8 g solute}{100 g solution}$ x $\frac{1.15 g solution}{1 ml}$ x $\frac{1 mol solute}{145.6 g solute}$ x $\frac{1000 ml}{1 L}$

molarity= 2.69 mol solute/L solution = 2.69 M

B) We know that there are 33.8 g of solute in 100 g of solution.

As the total solution is compounded by solute+solvent (in this case, solvent is water), the mass of water is the difference between the mass of the total solution and the mass of solute:

mass of water= 100 g - 33.8 g = 66.2 g

Now, we calculate the number of mol of both solute and water:

mol solute= 33.8 g solute x $\frac{1 mol solute}{145.6 g}$ = 0.232 mol

mol H20= 66.2 g H₂O x $\frac{1 mol H2O}{18 g}$

Finally, the mol fraction of solute (Xsolute) is calculated as follows:

Xsolute= $\frac{mol solute}{total mol}= \frac{mol solute}{mol solute + mol H2O}=\frac{0.232 mol}{0.232 mol + 3.677 mol}$

Xsolute= 0.059

4 0

3 years ago

Which of the following best describes an atom?A)Protons and electrons grouped together in a random pattern.B) A core of electron

madreJ [45]

Answer: B

Explanation:

5 0

3 years ago

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which

NeX [460]

Answer:

dissolving sugar in water

burning a candle

Explanation: these both have chemical and physical changes happening to them.

3 0

3 years ago

Read 2 more answers

If the mass of a block of wood is 4.6g and the density is 0.98g/mL what is the volume.

irina [24]

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass of wood = 4.6 g

density = 0.98 g/mL

It's volume is

$volume = \frac{4.6}{0.98} \\ = 4.69387755...$

We have the final answer as

Hope this helps you

3 0

3 years ago

Exactly 1.0 mol N2O4 is placed in an empty 1.0-L container and is allowed to reach equilibrium described by the equation N2O4(g)

lora16 [44]

<u>Answer:</u> The value of equilibrium constant is 0.997

<u>Explanation:</u>

We are given:

Percent degree of dissociation = 39 %

Degree of dissociation, $\alpha$ = 0.39

Concentration of $N_2O_4$ , c = $\frac{1mol}{1L}=1M$

The given chemical equation follows:

$N_2O_4\rightleftharpoons 2NO_2$

<u>Initial:</u> c -

<u>At Eqllm:</u> $c-c\alpha$ $2c\alpha$

So, equilibrium concentration of $N_2O_4=c-c\alpha =[1-(1\times 0.39)]=0.61M$

Equilibrium concentration of $NO_2=2c\alpha =[2\times 1\times 0.39]=0.78M$

The expression of $K_{c}$ for above equation follows:

$K_{c}=\frac{[NO_2]^2}{[N_2O_4]}$

Putting values in above equation, we get:

$K_{c}=\frac{(0.78)^2}{0.61}\\\\K_{c}=0.997$

Hence, the value of equilibrium constant is 0.997

4 0

3 years ago