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Andrew [12]
3 years ago
7

What is an element?

Chemistry
2 answers:
Marat540 [252]3 years ago
8 0
B. A pure substance made up of one type of atom
uranmaximum [27]3 years ago
3 0
B. A pure substance made up of one type of atom
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In 1895, X-rays were accidentally discovered during a scientific experiment. Today, X-rays are used to screen luggage in airport
allsm [11]
Thanks for your question!

The answer is science influencing technology, as it was discovered in a science experiment. It doesn't really influence society as much because it doesn't influence the way people act, just the how things work.

Hope this helped!
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4 0
3 years ago
The standard enthalpy of formation (ΔHf°) of calcium carbonate is –1207 kJ/mol. Which ONE of the equations below has ΔH° = –1207
Art [367]

Answer:

A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)

Explanation:

Standard enthalpy of formation of a chemical is defined as the change in enthalpy durin the formation of 1 mole of the substance from its constituent elements in their standard states.

The consituent elements of calcium carbonate, CaCO₃, in their standard states (States you will find this pure elements in nature), are:

Ca(s), C(s) and O₂(g)

That means, the equation that represents standard enthalpy of CaCO₃ is:

<h3>A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)</h3><h3 />

<em>Is the equation that has ΔH° = -1207kJ/mol</em>

3 0
3 years ago
A car is traveling 70km in 45 minutes. How many miles an hour is the car traveling?
labwork [276]

52

Explanation:

70x45÷60= 52

I hope this is helpful

5 0
2 years ago
PLEASE HELP!!!<br><br><br><br> How many grams are in 10.11 moles of sucrose?
Sloan [31]
There would be 67 left because you do
5 0
3 years ago
How do ionic bonds differ from covalent bonds?​
Alja [10]
Ionic bonds are a metal and a non metal bond and a covalent bond is two no metals banded together.
4 0
3 years ago
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