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Anna [14]
3 years ago
7

Why does a volumetric flask have the shape it does?

Chemistry
2 answers:
Stolb23 [73]3 years ago
5 0

Answer:

When the glassware was made by hand, the bulb at the bottom varied in size, so each flask had to be filled with the correct volume before the line could be etched on the glass. A tube was used for the neck since the volume filling the tube would change at a consistent rate. ... The flask looks like a pear shaped container.

Explanation:

Sergio [31]3 years ago
5 0
The bulb at the bottom differed in size when the glassware was produced by hand, so each flask had to be filled with the correct volume before the line could be engraved onto the glass. Since the volume filling the tube will shift at a constant rate, a tube was used for the neck that is tubular to signify when you have the right amount. The flask looks like a bottle shaped like a pear.
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How many dm³ of hydrogen,measured at s.t.p.,would be needed to reduce 47.7g of copper(II) oxide to copper?
GaryK [48]

Answer:

Option D. 13.44

Explanation:

We'll begin by calculating the number of mole in 47.7g of copper(II) oxide, CuO.

This can be obtained as follow:

Mass of CuO = 47.7 g

Molar mass of CuO = 63.5 + 16 = 79.5 g/mol

Mole of CuO =.?

Mole = mass /Molar mass

Mole of CuO = 47.7/79.5

Mole of CuO = 0.6 mole

Next, we shall write the balanced equation for the reaction. This is given below:

CuO + H2 —> Cu + H2O

From the balanced equation above,

1 mole of CuO reacted with 1 mole of H2 to produce 1 mole of Cu and 1 mole of H2O.

Next, we shall determine the number of mole of H2 needed to react completely with 0.6 mole of CuO.

This can be obtained as follow:

From the balanced equation above,

1 mole of CuO reacted with 1 mole of H2.

Therefore, 0.6 mole of CuO will also react with 0.6 mole of H2.

Finally, we shall determine the volume occupied by 0.6 mole of H2 at STP.

This can be obtained as follow:

1 mole of H2 occupied 22.4 dm³ at STP.

Therefore, 0.6 mole of H2 will occupy = 0.6 × 22.4 = 13.44 dm³.

Therefore, 13.44 dm³ of H2 is needed for the reaction.

4 0
3 years ago
A farmer uses water to irrigate his potato crops. Which roles of water does this examplify
exis [7]

Answer:

This exemplifies the agricultural role of water.

Explanation:

7 0
3 years ago
How many electrons does each gold atom gain? How many electrons does each iodine atom lose? What is the total number of electron
forsale [732]

Answer:

Explanation:

Half equation:

I. Au3+ + 3e- --> Au

II. 2I- --> I2 + 2e-

Au3+ + 3e- --> Au. ×2

2I- --> I2 + 2e- ×3

2Au3+ + 6e- --> 2Au

6I- --> 3I2 + 6e-

Overall equation

AuI3 --> 2Au + 3I2

A.

3 electrons

B.

2 electrons

C.

6 electrons

6 0
3 years ago
Read 2 more answers
H2(g) + Co(g) _CH3OH<br> balance the equation <br>​
Tom [10]

Answer:

CO + 2H2 = CH3OH

Explanation:

1. Label Each Compound With a Variable

  aCO + bH2 = cCH3OH

2. Create a System of Equations, One Per Element

  C: 1a + 0b = 1c

  O: 1a + 0b = 1c

  H: 0a + 2b = 4c

3. Solve For All Variables (using substitution, gauss elimination, or a calculator)

  a = 1

  b = 2

  c = 1

4. Substitute Coefficients and Verify Result

  CO + 2H2 = CH3OH

      L R

  C: 1 1 ✔️

  O: 1 1 ✔️

  H: 4 4 ✔️

8 0
2 years ago
Why is it useful to know the background level of extinction?
lawyer [7]

Answer:

NOAA and FWS are required by law to compare background rates to current rates.

Explanation:

5 0
3 years ago
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