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3 years ago

What effect does adding a neutron have on the atoms identity

1 answer:

5 0

Neutrons don’t carry an electrical charge, meaning that adding or subtracting them from the nucleus will not change the electrical charge of the nucleus of an atom. But, adding/removing neutrons changes the mass of the nucleus. This is how isotopes are formed.

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The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

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

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

7 0

3 years ago

A teacher wants to perform demonstration that illustrates both chemical and physical changes. Which would be the best demonstrat

saveliy_v [14]

Answer:

D) burning a candle

A demonstration that contains both physical and chemical changes will be BURNING OF A CANDLE.

<em>This is because when a candle is lighted up, on the top of it (where we see flame) the oxygen and other gases present around will be chemically changed (burned up)</em>

<em>When the wax in the top of the candle will get melted due to the heat of the fire a physical change takes places.</em>

4 0

3 years ago

a flack that weighs 345.8g is filled with 225 ml of carbon terachloride the weight of the flack and carbon terachloride is found

Jlenok [28]

The density of the carbon tetrachloride is 1.59 g/mL.

Mass of CCl₄ = 703.55 g – 345.8 g = 357.75 g

Density = mass/volume = 357.75 g/225 mL = 1.59 g/mL

7 0

3 years ago

How many moles are in 2.3 grams of phosphorus? :(

tatiyna

Answer:

there are 0.074 moles in 2.3 grams of phosphorus

4 0

4 years ago

A chemist needs 2.00 liters of hydrochloric acid. How many pints is this?

77julia77 [94]

Is that supposed to say 200/2.00??

6 0

4 years ago

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