CHEMISTRY HIGH SCHOOL

If 455-mL of 6.0 m HNO3 is used to make a 2.5L dilution, what is the molarity of the dilution

Answers

Answer 1
Answer: 2.5 L * 1000 = 2500 mL

C₁ * V₁ = C₂ * V₂

6.0 * 455 = C₂ * 2500

2730 = C₂ * 2500

C₂ = 2730 / 2500

C₂ = 1.092 M

hope this helps!

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In the following electrochemical cell, what is the reduction half-reaction? Mn(s) | Mn2+(aq) || Fe3+(aq), Fe2+(aq) | Pt(s)

Answers

In the given electrochemical cell, the reduction half-reaction occurs at the electrode on the right side of the double vertical line (||).

To determine the reduction half-reaction, we need to compare the standard reduction potentials (E°) of the species involved. The half-reaction with the more positive E° value will be the reduction half-reaction.

Looking up the standard reduction potentials in a reference table, we find that the standard reduction potential for the Mn2+/Mn couple is -1.18 V, and the standard reduction potential for the Fe3+/Fe2+ couple is +0.77 V.

Since the Fe3+/Fe2+ couple has a more positive standard reduction potential, it will undergo reduction. Therefore, the reduction half-reaction is:

Fe3+(aq) + e- → Fe2+(aq)

I hope this helps!

Nuclear fusion in the sun involves hydrogen (H) atoms combining to form helium (He). A student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction. What is wrong with the student's reasoning?The hydrogen in air is not densely packed enough for an uncontrolled chain reaction.
Uncontrolled chain reactions can only happen during nuclear fission.
It is impossible to cause a fusion reaction to happen anywhere outside of the sun.
We are safe because there is no radioactive hydrogen in the air.

Answers

Nuclear fusion in the sun involves hydrogen (H) atoms combining to form helium (He). A student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction. What is wrong in the student’s reasoning is that the uncontrolled chain reactions can only happen during nuclear fission.

Uncontrolled chain reactions can only happen during nuclear fission is what is wrong with the student's reasoning.

What is Nuclear fission?

This is the process in which the nuclei of an atomsplit into two or more nuclei with large amount of heat being involved.

Nuclear fusion in the sun involves hydrogen atoms combining to form helium and the student claims that since the atmosphere contains hydrogen, any fusion reaction on Earth would result in an uncontrolled chain reaction which is wrong as it occurs only during fission.

Read more about Nuclear fission here brainly.com/question/3992688

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What gas is removed from inhaled air

Answers

ur answer is oxygen (O2)!!
What gas is removed from inhaled air?

oxygen (O2)

According to Reference Table J, which of these metals will react mostreadily with 1.0 M HCl to produce H2(g)?(1) Ca (3) Mg(2) K (4) Zn

Answers

(K) potassium is the metal that will react most readily with 1.0 M HCl to produce H2(g).

What is potassium?

Potassium is a silvery-white metal with the symbol K and atomic number 19.

The reaction will be

\rm K + 2HCl = KCl_2 + H_2(g)

The potassium will react with HCl to produce potassium chloride and hydrogen gas.

It is a single displacement reaction.

In this type of reaction, more reactive metal is displaced with less reactive metal.

Thus, the correct option is 2) K.

Learn more about potassium, here:

brainly.com/question/8507057

Answer: The correct answer is Option 2.

Explanation:

The reaction between a metal and HCl is a type of single displacement reaction.

Single replacement reactions are defined as the reactions in which more reactive metal replaces less reactive metal from its chemical equation. The reactivity is determined from the series called reactivity series. The metal lying above in the series is more reactive than the metal lying below in the series.

General equation for these types of reactions is:

AB+C\rightarrow CB+A

From the series attached below, the most reactive metal is Potassium (K).

Increasing order of the reactivity of metals are:

Zn<Mg<Ca<K

Hence, the correct answer is Option 2.

Which types of reactions would result in the formation of precipitate?

Answers

Answer:

Double Displacement Reaction

Explanation:

A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.

In a fission reaction of U-235, there was a release of 9.20 × 1011 kJ of energy. What amount of mass in kilograms would have been lost?Recall that c = 3 × 108 m/s.

Answers

 e = mc^2 
 
m = e / c^2 

Plug in your numbers in the appropriate units.
m=1.02 × 10^-5

Answer : The amount of mass in kilograms lost would be, 1.022* 10^(-2)Kg

Solution : Given,

Energy of released in the reaction = 9.20* 10^(11)KJ

Speed of light = c = 3* 10^8m/s

Formula used :

E=m* c^2

where,

E = energy released

m = mass

c = speed of light

Now put all the given values in the above formula, we get the amount of mass would have been lost.

9.20* 10^(11)KJ=m* (3* 10^8m/s)^2

m=1.022* 10^(-5)KJ/m^2s^(-2)=1.022* 10^(-5)* 10^3Kg=1.022* 10^(-2)Kg

conversion : (1KJ/Kg=10^3m^2/s^2)

Therefore, the amount of mass in kilograms lost would be, 1.022* 10^(-2)Kg
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