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3 years ago

What is change in science

Chemistry

1 answer:

max2010maxim [7]3 years ago

7 0

Answer:

Scientific change is: "Any change in the scientific mosaic, i.e. a transition from one accepted theory to another or from one employed method to another. "

Explanation:

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Substances made of two or more elements chemically joined togethher are called what

slamgirl [31]

Answer:

compounds

Explanation:

Substances made of two or more elements that are chemically joined together are called <u>compounds</u>.

<em>Generally, elements are substances that contain just a type of atom. Compounds, on the other hand, contain different atoms (of different elements) that are chemically linked together. The linkage is referred to as bonding. The bonding could be covalent, ionic, or hydrogen bonding.</em>

7 0

3 years ago

2. The process of splitting an atom into two lighter atoms is called

Ira Lisetskai [31]

Option 2:OB.nuclear fission

6 0

4 years ago

Read 2 more answers

Phenol and benzoic acid are both weak acids that are solublein

stealth61 [152]

Answer:

Se explanation below

Explanation:

Here we will use the technique of extraction taking advantange of the different solubilities of Phenol and and Benzoic Acid in the NaOH and and NaHCO₃ solvents (In reality their anions). Notice that phenol does not dissolve in the weak base NaHCO₃ so we can have the solution of phenol and benzoic acid in ether and proceed to extract with this weak base, the phenol will remain in solution in the organic ether solution and the sodium benzoate will go into the water layer.

We then will repeat the extraction procedure to separate the phenol from the organic layer by using NaOH instead.

Benzoic Acid /

Phenol/ Ether ⇒Extract w/ ⇒ Organic Layer = Phenol/Ether

10 % NaHCO₃ Aqueous Layer = Sodium Benzoate

Sodium benzoate ⇒ 10 % HCl to precipitate Benzoic Acid

Filter Precipitate benzoic Acid ⇒ Recrystallize benzoic Acid

Phenol / Ether Extract w/ Organic Layer = Eher

10 % NaOH Aqueous Layer =

Sodium Phenolate

Sodium Phenolate ⇒ 10% HCl to precipitate Phenol Filter Precipitate Phenol ⇒ Recrystallize Phenol

7 0

3 years ago

If a gas occupies 12.60 liters at a pressure of 1.50 atm, what will its pressure at a volume of 2.50 liters?

Eddi Din [679]

Answer:

7.56 atm

Explanation:

Boyle's law states that the pressure and volume of a gas are proportional to each other

The formular for Boyle's law is

P1V1=P2V2

According to the question above, the values given are

P1=1.50 atm

P2= ?

V1=12.60 litres

V2= 2.50 litres

Let us make P2 the subject of formular

P2= P1V1/V2

P2= 1.50×12.60/2.50

P2= 18.9/2.50

P2= 7.56 atm

Hence when the volume of a gas is 2.50 litres then it's pressure is 7.56 atm

5 0

3 years ago

Which compounds are lewis acids? select all that apply. (ch3ch2)2hc+ cl3c− ch3nh2 bbr3?

alexandr402 [8]

The Lewis acids are electron pair acceptors due to the availability of vacant orbitals they accept electrons from the donor compounds.

$(CH_3CH_2)_2CH^{+}$ is a Lewis acid due to the unfilled valence shell on carbon atom (possessing positive charge) it accepts electron readily.
$CCl_{3}^{-}$ is not a Lewis acid due to the presence of negative charge which represents that there are electrons available for donation.
$CH_3NH_2$ is not a Lewis acid due to the presence of lone pair on nitrogen which is easily donated to the acceptors.
$BBr_3$ is a Lewis acid due to the availability of vacant p-orbital on boron atom.

Hence, $(CH_3CH_2)_2CH^{+}$ and $BBr_3$ are Lewis acids.

3 0

3 years ago