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____ [38]
3 years ago
7

Alchemy is a branch of ancient knowledge that states that the only three essential substances in nature are salt, sulfur, and me

rcury.
Which of these best explains whether alchemy is a science or pseudoscience? (4 points)
It is pseudoscience because ancient knowledge is mystical yet reliable.
It is pseudoscience because there are at least 118 known elements in nature.
It is a science because sulfur and mercury are known to be important elements.
It is a science because salt is a commonly used compound in several laboratory experiments.
Chemistry
1 answer:
Ivanshal [37]3 years ago
4 0

Answer:

It is pseudoscience because there are at least 118 known elements in nature.

Explanation:

Alchemy is an ancient branch of natural philosophy (not used much anymore).

I also just took the test and it's correct.

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What is the average atomic mass!?
Agata [3.3K]

Answer:

he average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance

6 0
3 years ago
What is the mass of potassium chloride when 6.75 g of potassium reacts with an excess of chlorine gas? the balanced chemical equ
lorasvet [3.4K]
The balanced equation for the above reaction is;
2K + Cl₂ ---> 2KCl
Stoichiomtery of K to KCl is 2:2
Potassium is the limiting reactant which is fully consumed in the reaction. The amount of product formed depends on amount of limits reactant present.
Number of moles of K reacted - 6.75 g/ 39 g/mol = 0.17 mol
Therefore number of KCl moles formed - 0.17 mol
Mass of KCl formed - 0.17 mol x 74.5 g/mol = 12.67 g 
6 0
3 years ago
A material through which heat travels easily is what
Bogdan [553]

Heat moves easily through good conductors of heat (such as metals) and very slowly through heat insulators (such as wood or plastic).

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3 0
3 years ago
What Elements that have an atomic number less than 37 and atomic mass greater than 78.4u?
umka21 [38]

Answer:

krypton

bromine

selenium

4 0
2 years ago
Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it
kvasek [131]

Answer:

0.396 M

Explanation:

Let's consider the following reaction.

2 COF₂(g) ⇌ CO₂(g) + CF₄(g)

We can find the concentrations at equilibrium using an ICE Chart.

         2 COF₂(g) ⇌ CO₂(g) + CF₄(g)

I            2.00              0            0

C           -2x                +x          +x

E         2.00-2x            x             x

The concentration equilibrium constant (Kc) is:

Kc=4.10=\frac{[CO_{2}][CF_{4}]}{[COF_{2}]^{2} } =\frac{x^{2} }{(2.00-2x)^{2} } =(\frac{x}{2.00-2x} )^{2} \\\sqrt{4.10} = \frac{x}{2.00-2x}\\4.05-4.05x=x\\x=0.802

The concentration of COF₂ at equilibrium is:

[COF₂] = 2.00-2x = 2.00-2(0.802) = 0.396 M

4 0
3 years ago
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