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3 years ago

What+differentiates+the+isotopes+of+an+element?

2 answers:

Natasha2012 [34]3 years ago

5 0

Isotopes are elements with same atomic number and different mass number. Atomic number denotes the number of protons whereas mass number denotes the number of nucleons (i.e protons and neutrons).Hence the number of neutrons differentiate the isotopes of an element.

andre [41]3 years ago

4 0

The number of neutrons differentiates the isotopes of an element~

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When does phenolphthalein turn pink? in the presence of a base in the presence of an acid when it is in a neutral solution when

Lelu [443]

Answer:

in the presence of a base

Explanation:

Phenolphthalein will turn pink in the presence of a base.

Phenolphthalein is an indicator that is used in acid/base titration to indicate end points. It responds to pH changes by changing its color. In basic solutions, the compound turns pink while it remains colorless in acidic medium. It has the chemical formula $C_2_0H_1_4O_4$ .

Phenolphthalein is considered a weak acid ordinarily and it ionizes incompletely in aqueous solution.

$HIn --> H^+ + In^-$

Addition of hydrogen ions shifts equilibrium to the left and the solution remains colorless while the addition of hydroxide ion removes the hydrogen ion and shifts the equilibrium to the right, giving pink coloration.

4 0

3 years ago

How do you convert 4.0 m to cm ?

gogolik [260]

In order to change meters simply move the decimal place two times to the right. You would move it like this: 40 (once), 400(twice). 4 meters is equal to 400 centimeters. Hope this helped :)

6 0

3 years ago

Read 2 more answers

given a k value of 0.43 for the following aqueous equilibrium suppose sample z is placed into water such that its original conce

serious [3.7K]

Answer:

Less than 0.033 M:

$[Z]_{eq}=2.4x10^{-3}M$

Explanation:

Hello,

In this case, the described equilibrium is:

$2A+B\rightarrow 2Z$

Thus, the law of mass action is:

$K=\frac{[Z]^2}{[A]^2[B]}=0.43$

Nevertheless, given the initial concentration of Z that is 0.033 M, we should invert the equilibrium since the reaction will move leftwards:

$\frac{1}{K}=\frac{[A]^2[B]}{[Z]^2}=\frac{1}{0.43}=2.33$

Know, by introducing the change $x$ due to the reaction extent, we can write:

$2.33=\frac{(2x)^2*x}{(0.033-2x)^2}$

Which has the following solution:

$x_1=2.29M\\x_2=0.0181M\\x_3=0.0153M$

But the correct solution is $x_3=0.0152M$ since the other solutions make the equilibrium concentration of Z negative which is not possible. In such a way, its concentration at equilibrium is:

$[Z]_{eq}=0.033M-2(0.0153M)$

$[Z]_{eq}=2.4x10^{-3}M$

Which is clearly less than 0.033 M since the addition of a product shift the reaction leftwards in order to reestablish equilibrium (Le Chatelier's principle).

Regards.

6 0

3 years ago

Find the mass in grams of 0.75 moles of magnesium (Mg).

Lady bird [3.3K]

Answer:

18.22874999999973

I recommend you to round the nearest 1 d.p

Explanation:

have a great day!

3 0

3 years ago

Read 2 more answers

Determine the ratio of amount NaOH reacting per unit amount FeCl3. Enter an integer that represents x mol NaOH/1 mol FeCl3.

earnstyle [38]

Answer is: the ratio of amount NaOH reacting per unit amount FeCl₃ is 3 mol NaOH /1 mol FeCl₃.

Balanced chemical reaction:
3NaOH(aq) + FeCl₃(aq) → 3NaCl(aq) + Fe(OH)₃(s).
NaOH is sodium hydroxide.
FeCl₃ is iron(III) chloride.
Coefficient for sodium hydroxide is three and for iron(III hydroxide is one.

8 0

3 years ago