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zloy xaker [14]
3 years ago
15

Please hurry!!! This is a test! I'll mark brainliest! +50

Chemistry
2 answers:
OLga [1]3 years ago
6 0

Answer:

1. D

2. B

3. A

4. A

5. C

6. B

7. D

8. A

9. B

10. A

11. B

12. B

13. C

14. B

15. D

Explanation:

Nikitich [7]3 years ago
3 0

Answer:

1. D.

Explanation:

It is the only one possible

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Although Plato and Aristotle disagreed with democritus what did his theory suggest was true about all matter?
Gnesinka [82]
Democritus believed that the universe was composed of atoms, correctly, of course. However, at the time, Plato's and Aristotle's hypothesi were just as valid because everyone was a philosopher. There were no scientists back then.
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3 years ago
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A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0°c. what is the magnitude of k at 75.0°c if ea =
IgorC [24]
According to this formula:
K= A*(e^(-Ea/RT) when we have K =1.35X10^2 & T= 25+273= 298K &R=0.0821
Ea= 85.6 KJ/mol So by subsitution we can get A:
1.35x10^2 = A*(e^(-85.6/0.0821*298))
1.35x10^2 = A * 0.03
A= 4333
by substitution with the new value of T(75+273) = 348K & A to get the new K
∴K= 4333*(e^(-85.6/0.0821*348)
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8 0
3 years ago
A compound contains 74.2 g Na and 25.8 g O. Determine the Empirical Formula for this compound
Ksenya-84 [330]

Answer:

The empirical formula for the compound is Na2O

Explanation:

Data obtained from the question include:

Sodium (Na) = 74.2g

Oxygen (O) = 25.8g

We can obtain the empirical formula for the compound as follow:

First, divide the above by their individual molar mass as shown below:

Na = 74.2/23 = 3.226

O = 25.8/16 = 1.613

Next, divide the above by the smallest number

Na = 3.226/1.613 = 2

O = 1.613/1.613 = 1

Therefore, the empirical formula is:

Na2O

4 0
3 years ago
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yan [13]
It all depends what theory it is most are supported by really good evidence but they just don't have all the evidence so it can't be proven a fact at that time

5 0
3 years ago
Can you determine the molecular formula of a substance from its percent composition
Natalka [10]
The percent composition<span> gives you only the empirical formula. 
</span><span>To get the molecular formula, you must either know the molecular mass or do an experiment to find it.</span>
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3 years ago
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