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abruzzese [7]
3 years ago
6

A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on t

he technique used? (4 points)
a It was a pure substance.
b It was a compound.
c It was a heterogeneous mixture.
d It was a homogeneous mixture
Chemistry
2 answers:
Anni [7]3 years ago
7 0

Answer:

b It was a compound.

Explanation:

<em>A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? </em>

<em>a It was a pure substance.</em>  NO. If the pure substance is a compound, this option could be. However, if the pure substance is a simple substance, it could not be separated into its components.

<em>b It was a compound. </em> YES. Compounds can be separated into pure substances using chemical reactions. For instance, H₂O → H₂ + 1/2 O₂

<em>c It was a heterogeneous mixture.</em>  NO. Heterogeneous mixtures can be separated into homogeneous mixtures using physical processes such as sieving, filtration, etc.

<em>d It was a homogeneous mixture.</em> NO. Homogeneous mixtures can be separated into pure substances using physical processes such as distillation, chromatography, etc.

frez [133]3 years ago
3 0

It is A I took a test just like this yesterday.

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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:

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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:

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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:

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1 mole of CuO reacted with 1 mole of H2.

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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.

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

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dangina [55]

Answer:

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Explanation:

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3 years ago
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