3. A student mixes a solid powder into a beaker of fluid. Which of the following would indicate that a chemical change has defin
itely occurred?
1 answer:
Explanation:
A chemical change is a change in which a new kind of substance is produced. Such changes are always accompanied by energy changes.
They are mostly reversible.
Some examples of such reactions are combustion, rusting of iron, precipitation, rancidity of butter, souring of milk.
- There might be some little change in mass
- It requires a considerable amount of energy
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Uhhhhhhh that’s kinda sus.
Answer:
e−(Ea/RT): the fraction of the molecules present in a gas which have energies equal to or in excess of activation energy at a particular temperature
Answer:
B.111
Explanation:
Atomic mass = number of protons(or atomic number) + number of neutrons
186 = 75 + number of neutrons
number of neutrons = 186 -75 = 111
Answer: 3 hydrogen atoms
Explanation: H=hydrogen
Helium has the smallest atomic radius® Α⇒Ω
