The two notations that represent isotopes of the same element is the one that represented in option 1
The lower number is the number of protons while the upper number is the atomic weight
hope this helps
<u>Answer:</u> The correct answer is Option 5.
<u>Explanation:</u>
- To calculate the molarity of the solution after mixing 2 solutions, we use the equation:
where,
are the n-factor, molarity and volume of the NaOH.
are the n-factor, molarity and volume of the 
We are given:
Putting all the values in above equation, we get:
- To calculate the molarity of acid, we use the equation given by neutralization reaction:
where,
are the n-factor, molarity and volume of acid which is 
are the n-factor, molarity and volume of base.
We are given:
Putting values in above equation, we get:
Hence, the correct answer is Option 5.
Answer:
Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.
Explanation:
Answer:
1. They debated about many things.
2. Greek philosophers debated about things. They did not have a scientific/experiment based approach to studying nature. They did not have tools.
3. Democritus
4. Democritus had the basic idea of atoms, even though he had no experimental evidence to support his thinking.
5. taught that there were substances called atoms and that these atoms made up all material things. The atoms were unchangeable, indestructible, and always existed.
Explanation:
hope this helps
Answer:
3 molecules
Explanation: i got it right on the test, also because the 2 other ones are compounds because they have hyrdogen and oxygen attached and molecules just have particles of one element attached
