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Aleonysh [2.5K]
3 years ago
13

Which pairs of matter demonstrate the law of conservation?

Chemistry
2 answers:
Oksana_A [137]3 years ago
6 0

Which pairs of matter demonstrate the laws of conservation?


The only correct ones are:


a Snowman and the melted remains of the same Snowman,


a lump of clay and the same lump broken into three pieces,


one apple and the same Apple cut into slices.


100% just had homework asking this same question got a 100% on USA TP

noname [10]3 years ago
4 0

Answer: There are 3 answers.

B.

* A Snowman.

* The melted remains of the same snowman.

C.

* A lump of clay.

* The same lump broken into three pieces.

F.

* One apple.

* The same apple cut into slices.

Answer key Below:

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−−−−−−−−−−−−−−−−−−−−

In your case, you have

pOH

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log

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14

−−−−−−−−−−−−−−so you can't use

pH

=

−

log

(

0.150

)

because that's the concentration of the hydroxide anions,

OH

−

, not of the hydronium cations,

H

3

O

+

. In essence, you calculated the

pOH

of the solution, not its

pH

.

Sodium hydroxide is a strong base, which means that it dissociates completely in aqueous solution to produce hydroxide anions in a

1

:

1

mole ratio.

NaOH

(

a

q

)

→

Na

+

(

a

q

)

+

OH

−

(

a

q

)

So your solution has

[

OH

−

]

=

[

NaOH

]

=

0.150 M

Now, the

pOH

of the solution can be calculated by using

pOH

=

−

log

(

[

OH

−

]

)

−−−−−−−−−−−−−−−−−−−−

In your case, you have

pOH

=

−

log

(

0.150

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=

0.824

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25

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The balanced equation for the reaction is
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