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Korvikt [17]
3 years ago
5

It is possible to increase a reaction rate by adding very small amounts of a catalyst, and this is because...

Chemistry
1 answer:
Harlamova29_29 [7]3 years ago
3 0
A. The catalyst increases the rate of reaction without being consumed
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Calculate the number of moles in 3.01 x 10²² atoms of calcium.​
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Answer:

Using dimensional analysis:

3.01x1022 molecules CO2 x 1 mol CO2/6.02x1023 molecules x 44. g CO2/mole = 2.20 g CO2

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How many joules of heat is lost when a 64 g piece of copper cools from 375 oC to 26 oC? The specific heat of copper is 0.38 J/go
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Answer: 8500 J lost or -8500 J

Explanation:

q=cmt

t=375-26

t=349

q=0.38(64)(349)

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Answer must have 2 sig figs, which means it rounds to 8500 J.

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A total of 25.0 mL of 0.150 M potassium hydroxide (KOH) was required to neutralize 15.0 mL of sulfuric acid (H2SO4) of unknown c
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We are told that KOH is being used to completely neutral H₂SO₄ according to the following reaction:

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0.025 L x 0.150 mol/L = .00375 mol KOH

0.00375 mol KOH x 1 mole H₂SO₄/1 mole KOH = 0.00375 mol H₂SO₄

We are told we have 15 mL of H₂SO₄ initially, so now we can find the original concentration:

0.00375 mol / 0.015 L = 0.25 mol/L

The concentration of H₂SO₄ being neutralized is 0.25 M.
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