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Anestetic [448]
3 years ago
6

50 POINTS PLUS BRAINLIEST NEED HELP ASAP Please solve these 5 questions

Chemistry
1 answer:
MariettaO [177]3 years ago
4 0

Answer:

Argon 7.89693x10^25 atoms

Gold 4.1949252x10^25 atoms

Carbon Monoxide 34.55149 moles

Potassium oxide  1.6 moles

Calcium 4.4969x10^24 atoms

Explanation:

Its done with dimensional analysis i can not put the full work here because it would look to sloppy

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Around 17,000,000 or a little more than that

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A puddle of water on the sidewalk evaporates and becomes water vapor. the water vapor travels through the air and comes into con
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2. it becomes a liquid
4. its molecules lose energy

The change in state is due to the loss of energy.

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PLEASE HELP, WILL GIVE BRAINLIEST!
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Hi,
The purpose of the burning splint is to provide activation energy.
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Fossils are the preserved remains or traces of an organism that used to be alive.
kotykmax [81]

Answer:

This is True

Explanation:

A fossil is any remains or trace of an ancient organism. Fossils include body fossils, left behind when the soft parts have decayed away, as well as trace fossils

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B. The following reaction takes place in a basic solution. (7 points)
Natali5045456 [20]

<u>Answer:</u> The final equation has hydroxide ions which indicate that the reaction has occurred in a basic medium.

<u>Explanation:</u>

Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously.

The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when the oxidation number of a species increases.

A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when the oxidation number of a species decreases.

The given redox reaction follows:

MnO_4^-(aq)+NO_2^-(aq)\rightarrow MnO_2(s)+NO_3^-(aq)

To balance the given redox reaction in basic medium, there are few steps to be followed:

  • Writing the given oxidation and reduction half-reactions for the given equation with the correct number of electrons

Oxidation half-reaction: NO_2^-+2OH^-\rightarrow NO_3^-+H_2O+2e^-

Reduction half-reaction: MnO_4^-+2H_2O+3e^-\rightarrow MnO_2+4OH^-

  • Multiply each half-reaction by the correct number in order to balance charges for the two half-reactions

Oxidation half-reaction: NO_2^-+2OH^-\rightarrow NO_3^-+H_2O+2e^-         ( × 3)

Reduction half-reaction: MnO_4^-+2H_2O+3e^-\rightarrow MnO_2+4OH^-             ( × 2)

The half-reactions now become:

Oxidation half-reaction: 3NO_2^-+6OH^-\rightarrow 3NO_3^-+3H_2O+6e^-

Reduction half-reaction: 2MnO_4^-+4H_2O+3e^-\rightarrow 2MnO_2+8OH^-

  • Add the equations and simplify to get a balanced equation

Overall redox reaction: 3NO_2^-+2MnO_4^-+H_2O\rightarrow 3NO_3^-+2MnO_2+2OH^-

As we can see that in the overall redox reaction, hydroxide ions are released in the solution. Thus, making it a basic solution

3 0
3 years ago
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