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3 years ago

What was alchemy?

Chemistry

2 answers:

stira [4]3 years ago

8 0

Answer:

Explanation:

its a very old study and philosophy of how to change basic substances such as metals into other substances

marusya05 [52]3 years ago

7 0

Im not completely sure on this but i think it would be C because it was a thing of the past

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21 Which process is used to determine the concentration of an acid?

Inessa05 [86]

Answer:

4) Titration

Explanation:

Titration is a common process used to determine the concentration of acids. It does this by adding a solution of base with a known concentration to the acid until it reaches neutralization.

8 0

3 years ago

Which of the following atoms could have an expanded octet when it is the central atom in a covalent compound?a) B

miv72 [106K]

Answer:

only chlorine can expand its octet.

Explanation:

An atom can expand its octet is it has empty d orbital

the electronic configuration of given elements will be:

B : 1s2 2s2 2p1 [Valence shell n =2 no d orbital]

O :1s2 2s2 2p4 [Valence shell n =2 no d orbital]

F : 1s2 2s2 2p5 [Valence shell n =2 no d orbital]

Cl :1s2 2s2 2p6 3s2 3p5 3d0 [Valence shell n =2 no d orbital]

Out of given elements only chlorine has empty d orbitals in its valence shell

Thus only chlorine can expand its octet.

3 0

3 years ago

An empty container weighs 80.21 g. it is filled with 20.14 mL of an unknown liquid, and the total weight of the container and li

tatiyna

Answer:

1.242 g/mL

Explanation:

Step 1: Given data

Mass of the empty container (m₁): 80.21 g

Mass of the filled container (m₂): 105.22 g

Volume of the unknown liquid (V): 20.14 mL

Step 2: Calculate the mass of the liquid

The mass of the liquid is equal to the difference between the mass of the filled container and the mass of the empty container.

$m = m_2 - m_1 = 105.22g - 80.21 g = 25.01 g$

Step 3: Calculate the density of the unknown liquid

The density of the liquid is equal to its mass divided by its volume.

$\rho = \frac{m}{V} = \frac{25.01g}{20.14mL} = 1.242 g/mL$

4 0

2 years ago

Construct a three-step synthesis of 1,2-epoxycyclopentane from cyclopentanol by dragging the appropriate formulas into the bins.

vladimir2022 [97]

Answer:

(1) Bromination, (2) E2 elimination and (3) epoxidation

Explanation:

In the first step, -OH group in cyclopentanol is replaced by more facile leaving group Br by treating cyclopentanol with $PBr_{3}$

In the second step, E2 elimination in presence of strong base e.g. NaOEt/EtOH produce cyclopentene

In the third step, treatment of cyclopentene with mCPBA produces 1,2-epoxycyclopentane

Full reaction scheme has been shown below

8 0

2 years ago

PLEASE HELP QUICK THANKS

blondinia [14]

Answer:

1. the intermingling substance one within another

2. equilibrium

3. caused by collisions with container walls

4. measure of average kinetic energy

5. determined by mass and speed.

Explanation:

7 0

2 years ago