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Anastaziya [24]
3 years ago
5

What is a pure substance​

Chemistry
1 answer:
Allisa [31]3 years ago
7 0

Answer:

a substance that has a definite chemical composition that cannot be changed through physical or chemical means

Hope this helped!

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Which part of the atom cannot have its location accurately determined and is modeled by a cloud around the center of the atom? A
Tju [1.3M]

Answer:

Electron

Explanation:

The answer would be the electron because it is constantly moving so its location cannot be accurately determined

3 0
2 years ago
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Given bh3, o3, co2, and nh3, which of these compound is an exception to the octet rules?.
Ghella [55]

Answer:

a. BH₃

Explanation:

According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.

From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.

hope this helps

5 0
2 years ago
Theoretical<br> Yield of Cu<br> based on<br> Amount of CuSO4
fiasKO [112]

Answer:

I hope this helps.

Explanation:

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2 years ago
At 298 K and 1 atm, bromine is a liquid with a high vapor pressure, whereas chlorine is a gas. This provides evidence that, unde
Galina-37 [17]

Explanation:

In liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.

In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.

So, when at 298 K and 1 atm Br_{2} exists in liquid state and Cl_{2} exists as a gas then it means there occurs strong force of attraction between the molecules of Br_{2} due to which it exists in liquid form.

Thus, we can conclude that at 298 K and 1 atm, bromine is a liquid with a high vapor pressure, whereas chlorine is a gas. This provides evidence that, under these conditions, the forces among Br_2 molecules are greater than those among Cl_2 molecules.

3 0
3 years ago
What is indicated by a letter in parentheses after a chemical
Sati [7]

The letter in parentheses after a chemical formula indicates c) the physical state of the substance.

The letters can be:

→ (s) for solid.

→ (l) for liquid.

→ (g) for gazeous.

→ (aq) for an aqueous solution (like NaCl (aq) - NaCl is dissolved in water)

4 0
3 years ago
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