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3 years ago

The meaning of atoms

Chemistry

2 answers:

nikdorinn [45]3 years ago

5 0

Answer:

Basic unit of a chemical element

Explanation:

REY [17]3 years ago

4 0

Answer:

They make up all matter.

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Enter the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation AZX

Sergio [31]

40 20Ca this is the appropriate symbol for an isotope of calcium-42 corresponding to the isotope notation AZX

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3 years ago

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The graph given below shows the motion of four runners P, Q, R, and S in a 5 km marathon.

wel

Answer:-

As we can see from the graphical data,

The distance covered by all the four runners is the same 5 km.

Among the four athletes, Athlete P covers the distance in under three hours.

It is the minimum time taken among the four athletes.

Thus Athlete P covers the 5 km distance in the minimum amount of time.

We know that speed = $\frac{Distance}{Time}$

Since time taken for P is minimum, his speed is the maximum. P ran the fastest.

Time taken by Q = 4.5 hours.

Speed of Q = $\frac{Distance}{Time taken by Q}$

= $\frac{5km}{4.5hour}$

= 1.1 km/ hr

Time taken by R = 6 hours.

Speed of R = $\frac{Distance}{Time taken by R}$

= $\frac{5km}{6hour}$

= 0.8 km/ hr

3 0

3 years ago

Worn away statue Mechanical? or Chemical?

kompoz [17]

Yes it is chemical because it's acid rain and other stuff that is warring it out

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3 years ago

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Linolenic acid has cis double bonds with the formula ch3ch2ch=chch2ch=chch2ch=ch(ch2)7cooh. write out the abbreviated systematic

valentinak56 [21]

Abbreviated systematic numbering for Linolenic Acid is,

18:3, n-3
Explanation:
In above abbreviation 18 specifies number of carbon atoms in Linolenic Acid, 3 specifies the number of double bonds and n-3 specifies the position of first double bond from methyl end. The structure of Linolenic Acid is as follow,

3 0

3 years ago

2.0L of hydrogen gas is mixed with 3.0L of nitrogen gas at STP in a rigid 5.0L vessel. A reaction occurs, producing ammonia gas

IrinaK [193]

Answer:

Moles NH₃: 0.0593

0.104 moles of N₂ remain

Final pressure: 0.163atm

Explanation:

The reaction of nitrogen with hydrogen to produce ammonia is:

N₂ + 3 H₂ → 2 NH₃

Using PV = nRT, moles of N₂ and H₂ are:

N₂: 1atmₓ3.0L / 0.082atmL/molKₓ273K = 0.134 moles of N₂

H₂: 1atmₓ2.0L / 0.082atmL/molKₓ273K = 0.089 moles of H₂

The complete reaction of N₂ requires:

0.134 moles of N₂ × (3 moles H₂ / 1 mole N₂) = 0.402 moles H₂

That means limiting reactant is H₂. And moles of NH₃ produced are:

0.089 moles of H₂ × (2 moles NH₃ / 3 mole H₂) = 0.0593 moles NH₃

Moles of N₂ remain are:

0.134 moles of N₂ - (0.089 moles of H₂ × (1 moles N₂ / 3 mole H₂)) = 0.104 moles of N₂

And final pressure is:

P = nRT / V

P = (0.104mol + 0.0593mol)×0.082atmL/molK×273K / 5.0L

P = 0.163atm

7 0

3 years ago