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Alexeev081 [22]
3 years ago
13

Antoinc Laurent Lavoisicr's contribution to chemistry was. a.the law of conservation of mass.

Chemistry
1 answer:
Ulleksa [173]3 years ago
8 0

The answer for the following question is explained below.

The option for the following answer is "d".

Explanation:

The phlogiston theory of combustion:(Greek word phlogiston means <u><em>"BURN"</em></u>)

Phlogiston theory states that phlogisticated substances are the substances that contain  phlogiston and dephlogisticate when burned.

Dephlogisticating is the process of releasing  stored phlogiston,which is absorbed by the air.

Growing plants then absorb this phlogiston,which is why air does not spontaneously combust and also plant matte burns as well as it does.

The prevailing theory was that flammable materials contained a substance called phlogiston that was released during the combustion.

For example:

  • phlogiston was transferring into the surrounding air.
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he balanced net ionic equation for precipitation of CaCO 3 when aqueous solutions of Na 2CO 3 and CaCl 2 are mixed is ________.
ale4655 [162]

Answer:

Net ionic equation: Ca^{2+}(aq.)+CO_{3}^{2-}(aq.)\rightarrow CaCO_{3}(s)

Explanation:

Reaction between Na_{2}CO_{3} and CaCl_{2} is an example of double decomposition reaction where each cations and anions of each salt exchange their partners during reaction to form CaCO_{3} and NaCl

CaCO_{3} is an insoluble salt. Hence precipitation of CaCO_{3} has been observed.

Molecular equation: Na_{2}CO_{3}(aq.)+CaCl_{2}(aq.)\rightarrow 2NaCl(aq.)+CaCO_{3}(s)

Total ionic equation:

2Na^{+}(aq.)+CO_{3}^{2-}(aq.)+Ca^{2+}(aq.)+2Cl^{-}(aq.)\rightarrow CaCO_{3}(s)+2Na^{+}(aq.)+2Cl^{-}(aq.)

Here Na^{+} and Na^{+} are spectator ions. Therefore they are eliminated from both side of total ionic equation to get net ionic equation.

Net ionic equation: Ca^{2+}(aq.)+CO_{3}^{2-}(aq.)\rightarrow CaCO_{3}(s)

6 0
3 years ago
When naming organic compounds, there are strict rules regarding punctuation?
melisa1 [442]

The rules for naming an organic compound regarding punctuation are

a) a comma is put in between two digits (or numbers)

b) a digit and a letter are separated by a hyphan

Example:

3-ethyl-2-methylhexane

2,3,3-trimethylhexane



3 0
3 years ago
What term describes isotopes with an unbalanced number of neutrons?
MAVERICK [17]
It might be radioactive
5 0
3 years ago
How many moles of salt will you be using in this recipe?​
user100 [1]
5 molessss booo booo
6 0
3 years ago
What has its own size and shape
erma4kov [3.2K]
I guess it is gases
I think , coz it has its own shape
Moves randomly
8 0
3 years ago
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