CHEMISTRY HIGH SCHOOL

What is true about the dilution of a solution?The amount of solute decreases.
The volume remains the same.
The amount of solvent increases.
The concentration increases.

Answers

Answer 1
Answer: The amount of solvent increases, since the solvent is the one diluting the solution, the more you want your solution diluted, the more of solvent you'd use. :)

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The early alchemists used to do an experiment in which water was boiled for several days in a sealed glass container. Eventually, some solid residue would appear in the bottom of the flask, which was interpreted to mean that some of the water in the flask had been converted into "earth." When Lavoisier repeated this experiment, he found that the water weighed the same before and after heating, and the mass of the flask plus the solid residue equaled the original mass of the flask. Were the alchemists correct?

Answers

Answer:

No

Explanation:

Hello,

Since the sealed glass container is isolated (closed system) no escape of boiled water (steam) was presented, so it is obvious that the alchemists were wrong, it is impossible that the water turns into "earth" because it has components that water does not have by itself (metallic and nonmetallic ions and molecular compounds) that is why the solid residue could have come from suspended solids or simply solids that were initially dissolved and due to the boiling of water, they remained at the bottom of the flask. Nevertheless, the experiment done by Lavoisier was more precise because the conclusion based on the initial and final masses, accounts for the boiling process; besides, the mass agreement substantiates that no mass was removed due to the isolation of the flask.

Best regards.

A polyatomic ion that contains two hydrogen atom is called

Answers

Hi there, A polyatomic ion that contains two hyrdrogen atom is called a 'dihydrogen.' The chemical name for dihydrogen is dihydrogen monoxide which is DHMO.

A compound contain only carbon, Hydrogen, Oxygen. Mass percentage of carbon is 52.2%, relative molecular mass of compound is 46, Find how many hydrogen atom present​

Answers

Answer:

Six

Explanation:

Mᵣ                           =  46

Aᵣ(C) = 0.522 × 46 =  24

Difference              =  22

Less 1 O                  = -16

Aᵣ(H)                        =   6

The relative atomic mass of the H atoms is 6.

The molecule contains six hydrogen atoms.

At STP, oxygen exists in two forms, O2(g) and O3(g). These two forms of oxygen have 1. different molecular structures and different properties 2. different molecular structures and the same properties 3. the same molecular structure and different properties 4. the same molecular structure and the same properties

Answers

Answer: option 1. different molecular structures and different properties.

Explanation:

1) O₂ and O₃ are different forms of the same element, in the same physical state (gaseous).

2) That is what is called allotropes.

3) The definition of allotropes is different forms of an element with different structures and different properties in the same physical state.

Graphite and diamond is other example of common allotropes.

4) O₃ and O₂ have the same kind of atoms (oxygen), but they are bonded differently (different structure, one molecule has 3 atoms, other 2 atoms) which conferes them different properties (e.g. different odor, different chemical reactivity).
At STP, oxygen exists in two forms, O2(g) and O3(g). These two forms of oxygen have different molecular structures and different properties. The answer is number 1. The rest of the numbers do not answer the question above.

For every Pb+2 ion that is formed, how many Cl- ions are formed? (Refer to the reaction in the lesson above.) answer choices
1
3
2
4

Answers

2 is the right choice
hope it helps

Answer:

2 Works on OW 2021

Explanation:

What are the products of the complete combustion of a hydrocarbon in excess oxygen

Answers

The products for the complete combustion of a hydrocarbon in excess air is carbon dioxide and water. Any hydrocarbon when reacted with oxygen will always yield the said products. Incomplete combustion, on the other hand, yields carbon monoxide and water.
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