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brilliants [131]
3 years ago
8

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

Chemistry
1 answer:
SSSSS [86.1K]3 years ago
8 0
Probably the kinetic energy of rubbing the pump against the valve, combined with the increase in gas pressure in the tire itself.
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5 0
4 years ago
Convert 7.02 mol of NaCl to formula units??
nika2105 [10]

<span>To convert the number of moles a compound to formula units, the conversion factor is Avogadro's number, 6.022 x10^23 formula units/ mol. In this case, we are given with 7.02 moles of sodium chloride. Hence the answer is 4.23 x 10^24 formula units.</span>

8 0
3 years ago
A chemical reaction can theoretically produce 137.5 grams of product, but in actuality 112.9 grams are
Butoxors [25]
<h3>Answer:</h3>

82.11%

<h3>Explanation:</h3>

We are given;

  • Theoretical mass of the product is 137.5 g
  • Actual mass of the product is 112.9 g

We are supposed to calculate the percentage yield

  • We need to know how percentage yield is calculated;
  • To calculate the percentage yield we get the ratio of the actual mass to theoretical mass and express it as a percentage.

Thus;

% yield = (Actual mass ÷ Experimental mass) × 100%

            = (112.9 g ÷ 137.5 g) × 100%

            = 82.11%

Therefore, the percentage yield of the product is 82.11 %

7 0
3 years ago
Which description lists Earth's layers from most superficial to deepest?
Zanzabum
Lithosphere, asthenosfhere , lower mantle
8 0
3 years ago
Read 2 more answers
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