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Nuetrik [128]
3 years ago
10

Enthalpy change is the

Chemistry
1 answer:
PtichkaEL [24]3 years ago
3 0

Answer:

I believe is A

Explanation:

Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure.

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1. How would you describe a wave to someone<br> who has never seen one before?
mixer [17]

Answer:

I would describe it as a amount of water that builds up and jumps up into the air and then splashes back down into the water like it was never there.

Explanation:

8 0
3 years ago
Find mass percent of each element URGENT PLS HELP!!!
VARVARA [1.3K]

Answer: Think and you will get it right!

Explanation:

To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.

8 0
2 years ago
When sodium is put in water, the metal floats on the surface and reacts to form sodium
mrs_skeptik [129]

Answer: Sodium also floats on the surface, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium and the reaction produces heat faster) and it melts almost at once to form a small silvery ball that dashes around the surface.

Explanation:

8 0
2 years ago
Read 2 more answers
What is the percent error for the experiment if the actual density is
OLga [1]

Answer:

<h3>The answer is 40.96%</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual density = 2.49g/mL

error = 2.49 - 1.47 = 1.02

We have

p(\%) =  \frac{1.02}{2.49}  \times 100 \\ = 40.96385542...

We have the final answer as

<h3>40.96 %</h3>

Hope this helps you

4 0
3 years ago
Read 2 more answers
The table compares the number of electrons in two unknown neutral atoms.
Andrej [43]

Answer:

Both are highly reactive.

Explanation:

A has 1 valence electron D has 3

A is sodium D is aluminum

5 0
3 years ago
Read 2 more answers
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