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Kryger [21]
2 years ago
9

You will learn that matter is neither created nor destroyed in any chemical change. Is this statement a theory or a law?

Chemistry
1 answer:
melomori [17]2 years ago
4 0
It's a law because the theory is just a statement
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In this reaction which substance behaves as the oxidizing agent pb
VashaNatasha [74]
Check the attached file for the answer.

6 0
3 years ago
a dog is trained to sit and shake hands. These traits are most likely? a. inherited b. not inherited c. not acquired d. innate
Ksenya-84 [330]
<span>A dog is trained to sit and shake hands. These traits are most likely?

Answer: B not </span>acquired 

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4 0
3 years ago
A 0.271g sample of an unknown vapor occupies 294ml at 140C and 874mmHg. The emperical formula of the compound is CH2. How many m
Phoenix [80]
Using PV = nRT, we can calculate the moles of the sample.
874 mmHg = 116,524 Pa
n = PV/RT
n = 116,524 x 294 x 10⁻⁶ / 8.314 x (140 + 273)
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moles = mass / Mr
Mr = 0.271/9.98 x 10⁻³
Mr = 27.2
Mass of empirical formula = 14
Repeat units = 27.2 / 14 ≈ 2

Formula of substance:
C₂H₄

Combustion equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

1 mole produces 2 moles of CO₂, so 3 moles will produce 6 moles CO₂
7 0
2 years ago
What is the total number of moles contained in 115g of C2H5OH?
julsineya [31]
2.4962859606272754 moles of C2H5OH
6 0
3 years ago
Which type of acetylcholine receptor is present on postganglionic neurons
Sonja [21]

Answer:

Mescarinic and Nicotinic

Explanation:

Postganglionic fibers can be present in both sympathetic and parasympathetic divisions, their main difference resides in how in the sympathetic division the postganglionic fibers are adrenergic and use norepinephrine (noradrenalin) as a neurotransmitter, in the parasympathetic division, on the other hand, fibers are cholinergic and use acetylcholine as a neurotransmitter, the<em> postganglionic neurons of sweat glands release acetylcholine for the activation of muscarinic receptors, another kind of receptor for acetylcholine are nicotinic receptors </em>that act as transmembrane sodium/potassium channels, while muscarinic receptors need to act through intracellular proteins.

I hope you find this informatiou useful and interesting! Good luck!

4 0
3 years ago
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