Unknown Substance A Unknown Substance B
Unknown Substance C
Flame color
While combusting the flame was
yellow and orange
Flame made a dark blue cone with a
smaller light blue cone in the middle
Flame was dark blue but had many
flashes of yellow and orange within it
Presence of When holding a test tube over the

Carbon Soot flame, there was a dark ash/powder
that formed on the test tube
When holding a test tube over the
flame, there was no noticeable
ash/powder that formed on the test
tube
When holding a test tube over the
flame, there was a small amount of
dark ash/powder that formed on the
test tube
Using the student's observations, which of the unknown substances experienced complete combustion and which experienced
incomplete combustion? Explain.

NEED HELP ASAP PLZZ

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

the answer is 303.15 or 303

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

you gotta add the following molecules so we can give u an answer

explanation: