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kondaur [170]
3 years ago
10

What variables have to be kept the same in this experiment?

Chemistry
1 answer:
Wittaler [7]3 years ago
7 0
The amount of hydrogen peroxide, the amount of catalyst, the agitation of the test tube, and the position of the glowing splint.
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The answer would be C
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A gas sample occupies 2.1 L at a pressure of 101 kPa.
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Answer:

D) 0.9 L

Explanation:

At constant temperature,

PV = Constant

so,

P1.V1 = P2. V2

101 × 2.1 = 235 × V2

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2 years ago
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When aqueous solutions of Na2SO4 and Pb(NO3)2 are mixed, PbSO4 precipitates. Calculate the mass of PbSO4 formed when 1.25 L of 0
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Answer:

The mass of PbSO4 formed 15.163 gram

Explanation:

mole of Pb(NO₃)₂ = 1.25 x 0.05 = 0.0625

mole of Na₂SO₄ = 2 x 0.025 = 0.05

                                      Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ + 2 NaNO₃

( Mole/Stoichiometry )    \frac{0.0625}{1}           \frac{0.05}{1}

                                     = 0.0625     = 0.05

From  (Mole/ Stoichiometry ) we can conclude that Na₂SO₄ is limiting reagent.

Mass of PbSO₄ precipitate = 0.05 x Molecular mass of PbSO₄

                                            = 0.05 x 303.26 g

                                            = 15.163 g

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3 years ago
Whats the difference between mass and volume
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Answer: Volume – How much space an object or substance takes up. Mass – Measurement of the amount of matter in an object or substance.

Explanation:

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Give two reasons why people should use petrochemicals wisely.
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2 Because they're a cause of carbon pollution.
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