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denis23 [38]
3 years ago
8

Which is the most important question for deciding if a chemical reaction has occurred?

Chemistry
2 answers:
777dan777 [17]3 years ago
7 0

Answer:

all these are physical properties except release of heat so it's probably heat energy given off

navik [9.2K]3 years ago
4 0

Answer:Was any heat energy given off?

Explanation:

A chemical reaction may exothermic (heat is given off) or endothermic (heat is absorbed). Size, density or texture of the substance are strictly physical properties which cannot confirm that a chemical reaction has transpired in the sample. The evolution of heat ultimately confirms that a chemical process has taken place.

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Prove that PV = nRT.​
qaws [65]

Find your answer in the explanation below.

Explanation:

PV = nRT is called the ideal gas equation and its a combination of 3 laws; Charles' law, Boyle's law and Avogadro's law.

According to Boyle's law, at constant temperature, the volume of a gas is inversely proportional to the pressure. i.e V = 1/P

From, Charles' law, we have that volume is directly proportional to the absolute temperature of the gas at constant pressure. i.e V = T

Avogadro's law finally states that equal volume of all gases at the same temperature and pressure contain the same number of molecules. i.e V = n

Combining the 3 Laws together i.e equating volume in all 3 laws, we have

V = nT/P,

V = constant nT/P

(constant = general gas constant = R)

V = RnT/P

by bringing P to the LHS, we have,

PV = nRT.

Q.E.D

6 0
3 years ago
PLEASE HELP I WILL MARK BRAINLIEST!!!<br><br> Reactions In Our World Lab Report
Cerrena [4.2K]

Answer:

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Explanation:

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6 0
3 years ago
A chemical change combining two elements results in?
Neporo4naja [7]

Answer:

When two distinct elements are chemically combined for example, chemical bonds form between their atoms, the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium and Chloride, which combine to form table salt.

8 0
3 years ago
Please answers the question​
frozen [14]
That is correct hope that helps
8 0
3 years ago
The _____ identifies an element.
marin [14]
Atomic Number. It represents the number of protons in an atom of a particular element, which is what identifies that particular element. If the number of protons is different, the element is different.
5 0
3 years ago
Read 2 more answers
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