The surface of the earth changes can be changed by many factors such as water, this slow process is called erosion and weathering. The water breaks down rock and soil into smaller pieces, and loosens them from the earth's surface.
The reaction is:
<span>2Na + Cl2 ---> 2 Na+ + 2Cl- </span>
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The specie that is oxidized is the one whose oxidation number increased wherein it is shown by sodium or Na. Chlorine or Cl, on the other hand, represents the substance being reduce where there is a change from a neutral charge to -1.</span>
One model is called the Billiard ball model proposed by John Dalton. It described the atom as an indivisible ball.<span />
Answer:
Explanation
Comment
Normally you would just use m*c*delta T. But the c is the same in both cases, so you need just use m*deltaT
Givens
25 degrees
m = ?
T = 25
t = final temp = 75
93 degrees
m = 250
T = 93
t = final temp = 75
Solution
(t - 25)*m = (93 - t) * 250 Remove the brackets
75*m - 25m = 93*250 - 250*75 Combine the right
m(75 - 25) = 23250 - 250*75
50 m = 23250 - 18750 Combine
50 m = 4500 Divide both sides by 50
50*m/50 = 4500/50
m = 90
Answer: 90 grams are needed.
Answer:
Proxima Centuri is 9 orders of magnitude further from New York compared to Perth
Explanation:
Distance of Proxima Centuri to New York = 4 × 10^16 meters
Distance of Proxima Centuri to Perth = 11000 miles
Since 1 mile = 1609 meters, distance to Perth in meters = 11000 × 1609
Distance to Perth = 17699000 = 1.7699 × 10^7 meters
Order of magnitude of the distances of Proxima Centuri to New York and Perth = 10^16/10^7
Order of magnitude = 10^9
Therefore, Proxima Centuri is 9 orders of magnitude further from New York compared to Perth.