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oee [108]
3 years ago
8

What comes first in a thunderstorm?

Chemistry
1 answer:
Vedmedyk [2.9K]3 years ago
8 0
It's the sound before the lightning because sound travels faster than light.
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3 years ago
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What is the mass of 0.60 moles of Al?
nikitadnepr [17]

It helps to map out how you will navigate through your unit analysis problem before setting it up.  

You are given moles and need grams.  What can be used as a conversion factor from moles to grams?  Molar mass.  We are working with aluminum, so we will need the molar mass of aluminum.  My Periodic Table tells me the molar mass of aluminum is approximately 27 g/mol.  Now we are ready to set up the unit analysis.

0.60molAl(\frac{27gAl}{1molAl} )=16.2 gAl

Moles must go on the bottom so that they cancel.  Notice how our number of significant figures is 2, so the answer must round to 16 g Al.

<h3>Answer:</h3>

16 grams

5 0
3 years ago
When two or more covalently bonded atoms combine chemically, we refer to the physical result as?
ale4655 [162]
It is referred as a covalent bond
6 0
3 years ago
How many atm are 12920 torr
Zinaida [17]

Answer:

17 atm

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3 0
3 years ago
Under what conditions is the change in internal energy, δe rxn , equal to the heat evolved in a chemical reaction?
Stells [14]
 the first law says that  the change in internal energy of a system is given by: 

δ<span>E = δq + δw</span>

where δ<span>E is the i change in internal energy, </span>

<span>δq is the amount of thermal energy added to the system from the surroundings </span>

<span>δw is the l work done *on* the system *by* the surroundings. </span>

<span>For a system only undergoing expansion work,
δw = -p</span>δ<span>V, so: </span>

δE = δq - p δ<span>V </span>
when δV = 0, then δe=δq
4 0
3 years ago
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