Answer:
Scientist used models to explain and predict the behavior of real object or system
Q= ? kJ
m= 1.37 kg ×
=1370 g<u>
</u>
c=4.18 J/g° C
ΔΤ= <span>89.5-21.3=
68.2˚C
</span>?
J = (1370
g) (4.18
J/g˚C) <span>(68.2˚C)
</span>q
= 390,554 J×
<u />
q
= 391 kJ
Answer:
5000 molecules of A will needed to react with 5000 molecules of B to gives 5000 molecules of AB.
Explanation:
A+B → AB
Given that 100 molecules of A combines with 100 molecules of B to give 100 molecules of AB.
According to reaction, 1 molecule of AB is produced by 1 molecule of A.
Then 5000 molecules of AB will be given by:
molecules of A
5000 molecules of A will needed to react with 5000 molecules of B to gives 5000 molecules of AB.
Answer:
Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Hot water is less dense and will float on room-temperature water. <u>Cold water is more dense and will sink in room-temperature water.</u>
<u></u>
Do you mean "deciding when the continents shifted"? If so, the fossils of fish and other animals found in mountain belts show when water was surrounding a certain landmass. From here scientists can determine when this land mass separated.