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AysviL [449]
4 years ago
10

Descibe 2 everyday situations that would require you to identify an unkown sustance

Chemistry
1 answer:
choli [55]4 years ago
6 0
- A substance that consists of an unknown chemical composition

- Analysis of substance properties

- Requires a series of tests & based solely on comparison

- Chemists determine unknown chemical substances

- The process can range from 10 minutes to several days.
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Which of the following are second-order reactions? a. C2H6 → 2 CH3 b. 2 N2O5 → 4 NO2 + O2 c. 2 HI → H2 + I2 d. 2 N2O → 2 N2 + O2
Klio2033 [76]

Answer:

The answer is b, c, d, e

Explanation:

b. 2 N2O5 → 4 NO2 + O2

r = k [N2O5]^2 --> Second-order regarding global reaction

c. 2 HI → H2 + I2

r = k [HI]^2 --> Second-order regarding global reaction

d. 2 N2O → 2 N2 + O2

r = k [N2O]^2 --> Second-order regarding global reaction

e. 2 NO2 → 2 NO + O2

r = k [NO2]^2 --> Second-order regarding global reaction

8 0
3 years ago
which combination of temperature and pressure correctly describes standard temperature and pressure, STP? A) 0 degrees C and 101
ASHA 777 [7]

Answer: A


0 degrees and 101 kPa are the conditions that describe the standard temperature and pressure. When expressed in K, the standard temperature 0 degrees equals 273.5 K. Also the standard pressure 101 kPa equals 760 mmHg or 1 Atm.

5 0
3 years ago
Read 2 more answers
A student submits the following work on the mass number, but he has made a few mistakes. Select the sentences that are incorrect
rewona [7]

Answer

 

Calculating the mass number for an atom requires that we know the atomic number and the number of protons in the atom’s nucleus. The mass number then gives us the average weight of atoms of a given element. However, as long as the number of protons equals the number of neutrons, the values balance out and we always obtain a whole number for the mass number.

Explanation:

those 3

7 0
4 years ago
Give the formula
madreJ [45]
Hello!!! I would like to give you my answer!!!
 <span>%error= (-890kJ-0.07kJ)/(-890kJ)x100 = 110.02%
I hope this helps!!! :-D</span>
8 0
4 years ago
The North Star is the last star in the Ursa Minor constellation.<br> True<br> False
Alja [10]
The answer is true. It is the last star.
4 0
3 years ago
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