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3 years ago

What are the units for the atomic radius?

Chemistry

1 answer:

Musya8 [376]3 years ago

8 0

Angstroms 1.0 x 10^-10 meters, nanometer 1.0 x 10^-9 meters, and picometer 1.0 x 10^-12 meters.

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What mass of silver chloride precipitate will be produced if 25 cm3 of 0.1M silver nitrate is added to excess sodium chloride so

ehidna [41]

We have 25cm^3 of 0.1mol AgNO3.

25cm^3 = 0.025L, so we have 0.025 x 0.1 = 0.0025mol AgNO3, so

0.0025AgNO3 + 0.0025NaCl = 0.0025AgCl + 0.0025NaNO3

Change in Free Energy: ΔG(20C) = -0.064kJ (negative, so the reaction runs)

Change in Enthalpy: ΔH(20C) = -0.110kJ (negative, so the reaction is exothermic)

This reaction produces 0.358g of AgCl and 0.213g of NaNO3

Les Mclean PhD

6 0

2 years ago

Indicate whether the following balanced equations involve oxidation-reduction. Check all that apply. Check all that apply. 2H2SO

guapka [62]

Answer : The balanced equations involve oxidation-reduction are:

(a) $2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

(b) $3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

(c) $NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given chemical reaction is:

$2H_2SO_4(aq)+2NaBr(s)\rightarrow Br_2(l)+SO_2(g)+Na_2SO_4(aq)+2H_2O(l)$

This reaction involve oxidation-reduction reaction because the oxidation state bromine changes from (-1) to (0) which shows oxidation and sulfur changes from (+6) to (+4) which shows reduction.

(b) The given chemical reaction is:

$3SO_2(g)+2HNO_3(aq)+2H_2O(l)\rightarrow 3H_2SO_4(aq)+2NO(g)$

This reaction involve oxidation-reduction reaction because the oxidation state sulfur changes from (+4) to (+6) which shows oxidation and nitrogen changes from (+5) to (+2) which shows reduction.

(c) The given chemical reaction is:

$NaI(aq)+3HOCl(aq)\rightarrow NaIO_3(aq)+3HCl(aq)$

This reaction involve oxidation-reduction reaction because the oxidation state iodine changes from (-1) to (+5) which shows oxidation and chlorine changes from (+5) to (-1) which shows reduction.

(d) The given chemical reaction is:

$PBr_3(l)+3H_2O(l)\rightarrow H_3PO_3(aq)+3HBr(aq)$

This reaction does not involve oxidation-reduction reaction because the oxidation state of element present on reactant and product side are same.

3 0

3 years ago

True

Iteru [2.4K]

Answer:

The question 7 answer is false

the question 8 answer is true

8 0

3 years ago

Please want to know how to calculate molecular mass

Fudgin [204]

Answer:

You multiply the elements atomic number by the number of atoms in the element in order to find its molecular mass.

Hope this helps!

3 0

3 years ago

At room temperature, what is the only metal that is in liquid form?

Olenka [21]

Hello!

Mercury is the only metal that takes liquid form at room temperature.

The metal is also very toxic to humans, so "playing with it" is a bad idea

this metal used to be used in thermometers, but most of them today don't use mercury anymore

I hope this helps, and have a nice day!

3 0

3 years ago