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Leya [2.2K]
3 years ago
15

Compounds are pure substances. What other substances are considered pure substances?

Chemistry
1 answer:
dimaraw [331]3 years ago
6 0

Answer:

um... hydrogen gas

gold metal

sugar (sucrose)

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Write the symbol of each neutral element based<br> on its Noble Gas Shorthand configuration:
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Answer:

1. Co

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3. Ba

Explanation:

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What is the atomic number of an ion with 5 protons, 6 neutrons, and a charge of 3?
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Which of the following explains the importance of the activation energy acting as a barrier for reactants? A:It prevents most re
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A: It prevents most reactions from occurring spontaneously.

The answer above is correct.
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2 years ago
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A sample of neon gas occupies a volume of 752ml at 25k. What volume will the gas occupy at 80k if the pressure remains constant
Anettt [7]

Answer:

The gas occupy 2406.4 mL at 80 K.

Explanation:

Given data:

Initial volume of gas = 752 mL

Initial temperature = 25 K

Final temperature = 80 K

Final volume = ?

Solution:

The given problem is solved by using charle's law.

V₁/T₁ = V₂/T₂

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7 0
2 years ago
Francium is the most reactive element in Group 1.
natali 33 [55]

Answer:

Francium is hypothesized to be the most reactive metal, but so little of it exists or can be synthesized, and the longest half-life of its most abundant isotope is 22.00 minutes, so that its reactivity cannot be determined experimentally.

Explanation:

Francium is an alkali metal in group 1/IA. All alkali metals have one valence electron. As you go down the group, the number of electron energy levels increases – lithium has two, sodium has three, etc..., as indicated by the period number. The result is that the outermost electron gets further from the nucleus. The attraction from the positive nucleus to the negative electron is less. This makes it easier to remove the electron and makes the atom more reactive.

Experimentally speaking, cesium (caesium) is the most reactive metal.

6 0
3 years ago
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