All categories

4 years ago

HELP PLEASE!!!! 15 POINTS!!! HELP!!

Chemistry

2 answers:

Elis [28]4 years ago

6 0

Answer:

You want a chemical that absorbs energy because it needs to absorb heat energy and quickly cool the contents of the pack.

damaskus [11]4 years ago

6 0

Answer:

Absorb energy.

Explanation:

If you wanted to make a cold pack that absorbs heat (aka an endothermic reaction), then you'd want to use a chemical that absorbs energy. This would absorb the heat. Hope this helped :)

You might be interested in

Which answer best explains one of the reasons that oceans are salty?

Tatiana [17]

Answer:

(D) Water from streams and rivers carry salt to the ocean

Explanation:

Hope this helps!

8 0

3 years ago

Where is the friction that allows the skater to complete the move that is occurring in this image? a girl ice skating © Wildcow

adelina 88 [10]

Answer:

C. The point of contact between the skates and the ice

Explanation:

That is the only point of friction with the ice that provides the ability to complete the move.

4 0

4 years ago

How many significant figures are in 820 400.0 L

raketka [301]

Answer:

7 significant numbers

7 0

3 years ago

Plzzz help me out as I was not in class and I missed the lesson

VARVARA [1.3K]

Answer:

Well why didn't you do it? Have a great day and I am so sorry for wasting your points I don't need them. I hope someone helps!! ;)

Explanation:

3 0

3 years ago

Phenols do not exhibit the same pka values as other alcohols; they are generally more acidic. Using the knowledge that hydrogen

nevsk [136]

Answer:

Phenols do not exhibit the same pka values as other alcohols;

They are generally more acidic.

Using the knowledge that hydrogen acidity is directly related to the stability of the anion formed, explain why phenol is more acidic than cyclohexane.

Explanation:

According to Bromsted=Lowry acid-base theory,

an acid is a substance that can release $H^{+}$ ions when dissolved in water.

So, acid is a proton donor.

If the conjugate base of an acid is more stable then, that acid is a strong acid.

In the case of phenol,

the phenoxide ion formed is stabilized by resonance.

$C_6H_5OH -> C_6H_5O^- +H^+$

The resonance in phenoxide ion is shown below:

Whereas in the case of cyclohexanol resonance is not possible.

So, cyclohexanol is a weak acid compared to phenol.

7 0

3 years ago