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shusha [124]
3 years ago
9

Elements in Group 18 are known

Chemistry
1 answer:
o-na [289]3 years ago
6 0

Answer:

C the number and placement of the electrons

Explanation:

Elements react with one another because they want to achieve a full valence shell of electrons. The noble gases already have a full valence shell of electrons, so they are unlikely to react with other elements.

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Diffusion is a general term referring to the net movement of atoms and molecules along a concentration gradient, from an area of
aniked [119]

Answer:

Higher concentration to an area of lower concentration

Explanation:

When you open a perfume bottle at a corner of a room, after a while, its fragrance can be perceived across a distance at the other end of the room. This is because, molecules of the compound in the fragrance have moved from the area of higher concentration in the perfume bottle, across a concentration gradient to a region of lower concentration at the other end of the room. This is diffusion.

7 0
3 years ago
What is the primary requirement for a molecule to be analyzed by Gas Chromatography?
BabaBlast [244]

Answer:

b) The molecule has a molecular weight under 200 g/mole

Explanation:

The molecule has a molecular weight under 200 g/mole is the primary requirement for a molecule to be analyzed by Gas Chromatography.

3 0
3 years ago
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When a pure substance melts does its particles get larger
Lera25 [3.4K]
No,they just separate away from each other
3 0
3 years ago
Is Amplitude a measure of a waves? A. speed B. energy C. distance D. frequency
iren2701 [21]

the answer is C. Distance

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5 0
3 years ago
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Calculate the mass in mg of the aspirin tablet that contains 5.0 grains of aspirin . Assume 1 pound contains 7000 grains.
Rzqust [24]

Answer:

323.99 mg

Explanation:

We need to find the mass of the aspirin tablet that contains 5.0 grains of aspirin.

1 pound = 7000 grains

1\ \text{grain}=\dfrac{1}{7000}\ \text{pounds}

5\ \text{grain}=\dfrac{1}{7000}\times 5\ \text{pounds}\\\\=\dfrac{1}{1400}\ \text{pounds}

We know that, 1 pound = 453.592 grams

Also, 1 pound = 453592 mg

\dfrac{1}{1400}\ \text{pounds}=\dfrac{1}{1400}\times 453592\ mg\\\\=323.99\ \text{mg}

Hence, 4 grains of aspirin contains 323.99 mg.

4 0
3 years ago
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