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Dahasolnce [82]
3 years ago
11

Each day, changes take place in the atmosphere. All these frequent changes are called _______.

Chemistry
2 answers:
sergij07 [2.7K]3 years ago
6 0
:oooooooooooooooooo
fkfr
andriy [413]3 years ago
5 0

the answer is that the changes are <u>weather</u>

<u />

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The atomic particles given off as a result of nuclear fusion are?
Vilka [71]

Answer:

I think <em><u>alpha</u></em> and <em><u>beta</u></em> is the answer.

4 0
3 years ago
Read 2 more answers
3 points
VLD [36.1K]

Answer:

<h3>The answer is 8.29 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual density = 19.30g/L

error = 20.9 - 19.3 = 1.6

We have

p(\%) =  \frac{1.6}{19.3}  \times 100 \\  = 8.290155440...

We have the final answer as

<h3>8.29 %</h3>

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5 0
3 years ago
A 500 gram piece of metal had a volume of 2.75cm3. What is it’s density
beks73 [17]

Answer:

181.82 g/cm3

Explanation:

density is mass / volume so it is 500 / 2.75=181.82 g/cm3

8 0
3 years ago
A certain reaction with an activation energy of 205 kj/mol was run at 485 k and again at 505 k . what is the ratio of f at the h
lapo4ka [179]
Arrhenius' Law relates activation energy, Ea, rate constant, K, and temperature, T as per this equation:

K (T) = A * e ^ (-Ea / RT), where R is the universal constant of gases and A is a constant which accounts for collision frequency..

Then you can find the ration between K's at two different temperatures as:

K1 = A * e ^ (-Ea / RT1)

K2 = A* e ^(-Ea / RT2)

=> K1 / K2 = e ^ { (-Ea / RT1) - Ea / RT2) }

=> K1 / K2 = e ^ {(-Ea/ R ) *( 1 / T1 - 1 T2) }

=> K1 / K2 = e^ { (-205,000 j/mol / 8.314 j/mol*k )* ( 1 / 505K - 1/ 485K) }

=> K1 / K2 = e ^ (2.0134494) ≈ 7.5

Answer: 7.5




8 0
3 years ago
What is an example of a covalent bond and why​
zhenek [66]

Answer:

Water

Explanation:

Hydrogen and oxygen is bonded together to make H2O aka. water

5 0
3 years ago
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