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djyliett [7]
3 years ago
7

Which of these is an example of a chemical change?

Chemistry
2 answers:
egoroff_w [7]3 years ago
8 0

A. Fireworks exploding is the answer

slavikrds [6]3 years ago
7 0

Hey There,

Your answer is A) Fireworks exploding

This is an action of chemical change. Grinding powder, melting cheese and ironing a shirt are all action of physical change. You are just changing their form, not performing a chemical change. When fireworks explode, a chemical inside of them changes.

Best Of Luck,

- I.A. -

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W7L5 Stoichiometry Practice 2
Rzqust [24]

Answer:

.079 moles of Nirogen gas (N2)

Explanation:

You can see from the equaton that each ONE mole of N2 produces TWO moles of NH3.

 Find the number of moles of NH3 produced.

    Using Periodic Table : Mole wt of NH3 = 17 gm/mole

          2.7 gm / 17 gm/mole = .1588 moles

      One half as many moles of N2 are needed  = .079 moles

6 0
2 years ago
Complete and balance the molecular equation, including phases, for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous b
expeople1 [14]
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The right side and the left side of the reaction have equal number of elements, therefore it is balanced.

5 0
3 years ago
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trapecia [35]

Answer: The correct answer is option E

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Sodium/potassium pump is a mechanism that involves the movement of sodium ions (Na+) out of a cell and potassium ions (K+) into a cell, thereby regulating concentration of ions on both sides of a typical cell membrane.

In this situation, the sodium-potassium pump is usually helps in the establishment of the resting potential. The potassium voltage channels normally closes before the membrane potential is brought to a resting level.

In summary, sodium/potassium pump helps to maintain a balance in the system.

6 0
3 years ago
Please help asap! Giving brainliest to correct answer.
Leya [2.2K]

Answer:

C. It may act as an insulator or a conductor.

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