CHEMISTRY HIGH SCHOOL

What is the mass of 1.25 x 10^24 Oxygen atoms? *1.)32.0 g
2.)1.6 x 10^23 g
3.)O 16.0g
4.)33.2 g

Answers

Answer 1
Answer:

Answer:

4.)33.2 g

Explanation:

(1.25E24/6.022E23)×15.99

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The element oxidized in the reaction described in PbO2 + 4HCl → 2H2O + PbCl2 + Cl2 is A. Pb. B. O. C. H. D. Cl.

Answers

For an element to be oxidized, its oxidation number would have to increase.

An element or compound's oxidation number is mainly dependent on its charge, except in special cases.

In PbO₂, Oxygen's oxidation number is always -2, except in hydrogen peroxide where it is -1. Since PbO₂ is neutral, its total oxidation number must be 0. Since there are two oxygens with an oxidation number of -2, we know that Pb's oxidation number is +4, since +4 -2×2 = 0.
Using the same method we can find Pb's oxidation number in PbCl₂. Unless paired with another halogen, which it isn't, Cl in a compound has an oxidation number of -1, so Pb = +2 since +2 -1×2 = 0.
Pb's oxidation number has gone from +4 to +2, so it has been reduced, so A. Pb is not the answer.

Oxygen in a compound's oxidation number is always -2 unless in H₂O₂ and it isn't on either side of the equation, so its oxidation number doesn't change and it remains in a compound, so B. O is not the answer.

Hydrogen in a compound's oxidation number is always +1, except in hydrides when it is -1, but it isn't, so it doesn't change , so C. H is the answer.

Therefore D. Cl is correct, since its oxidation number increases from -1 in HCl to 0 in Cl2 (since elements not in a compound have an oxidation number of 0)

Hope this helps!

For which of the following equilibria does Keq= [O2]?a. O2(l)<=>O2(g)
b. 2O3(g)<=>3O2(g)
c. 2H2O(l)<=>2H2(g)+ O2(g)
d. 2Hg(s)+ O2(g)<=>2HgO(s)
e. C(s)+ O2(g)<=>CO2(g)

Answers

its A if youre doing plato

Which of the following solutions has the highest pH: can you also explain how you can determine if a solutions have a highest pHa)1.00 mol L HNO3 (aq)
b)1.00 mol L KOH (aq)
c)1.00 mol L NaCL (aq)
d)1.00 mol L solution of CaCL2 (aq)

At equal concentrations, which of the following solutions is the most conductive?
a) C6H12O6 (aq)
b) CH3COOH (aq)
c) HClO4 (aq)
d) CH3OH (aq)

Answers

Final answer:

The solution with the highest pH is KOH, because it's a strong base. The most conductive solution would be HClO4, because it's a strong acid and dissociates into ions which are responsible for conducting electricity.

Explanation:

The solution that has the highest pH is b) 1.00 mol L KOH (aq). In the pH scale, lower values (0-6) represent acids, and higher values (8-14) represent bases. As KOH is a strong base, it dissociates completely in water to form K+ and OH- ions, thereby increasing the pH of the solution.

On the other hand, HNO3 is a strong acid and would have a low pH. NaCL and CaCL2 are salts and make neutral solutions, resulting in a pH of around 7.

The most conductive solution at equal concentrations would be c) HClO4(aq). Ionic compounds are good conductors of electricity in a solution since they dissociate into ions. HClO4 is a strong acid and would conduct electricity better than the others. The conductivity is due to the presence of ions which carry the current.

Learn more about pH and Conductivity here:

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Final answer:

A 1.00 M solution of KOH (aq) would have the highest pH because it is a strong base. A 1.00 M solution of HClO4 (aq) would be the most conductive as it is a strong, fully ionizing acid that produces a high number of ions.

Explanation:

In terms of pH, a solution of 1.00 M KOH (aq) would have the highest pH. The reason is that KOH is a strong base and it completely dissociates in water to form K+ and OH- ions, the latter of which increase the pH of the solution. HNO3, on the other hand, is a strong acid and would result in a low pH. NaCl and CaCl2 are salts and would result in neutral or slightly acidic or basic solutions, depending on the corresponding acidity or basicity of their constituent ions.

Regarding the conductivity, a 1.00 M solution of HClO4 (aq) would be the most conductive. Conductivity relies on the number of ions present in the solution that are capable of carrying current. HClO4 is a strong, fully ionizing acid producing a high number of ions in the solution. The other solutions either are weak acids like CH3COOH, which ionize only partially, or contain compounds like C6H12O6 and CH3OH that don't ionize at all.

Learn more about pH and Conductivity here:

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Formula of velocity rate​

Answers

Answer:

V=d/t

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Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt.

a ball rolls down a rap . A small amount of friction heats up the ball . what energy transformations are taking place ?

Answers

A ball rolls down a rat a small amount of friction heats up the more the energy transformed and I’ll take it please

0.764 km to centimeters

Answers

Answer: 76400cm

Explanation:
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