I believe the answer would be D.
Because a chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
If you burn a candle, it's mass will decrease. If that's the case you have changed a physical property of the candle.
Burning anything is always a chemical change Gasoline ( a hydrocarbon) burns in oxygen to produce water and carbon dioxide.
Hydrogen and Oxygen. You need two hydrogen atoms and one oxygen atom to make up H2O
Answer:
Most organic compounds contain carbon and <u>hydrogen</u>.
Explanation:
Organic compounds are class of compounds which mainly constitute carbon and other elements like hydrogen, oxygen, nitrogen and sulfur etc.
In these compounds hydrogen is essentially present along with carbon as both make the basic organic class of compounds namely, Alkanes (saturated hydrocarbons), Alkenes and Alkynes (unsaturated hydrocarbons).
While remaining classes of organic compounds are derived from these three classes of hydrocarbons. Therefore, we can conclude that organic compounds are basically made up of carbon and hydrogen.
Answer:
Hydrogen concentration = 7.94×10^-3 M
Explanation:
from potenz Hydrogen ( pH ) definition
pH = -log[H+]
2.1 = -log[H+]
2.1/-log = -log[H+]/-log
10^-2.1 = [H+]
[H+] = 7.94×10^-3M
