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4 years ago

What did alchemists contribute to the development of chemistry?

1 answer:

3 0

The alchemists were the first chemists, but they were also mixing chemicals, they believed that magic would help with their experiments.but it didn't. but their experiments of the science of chemistry did.

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What is the Ea for the exothermic reaction on the right A) 268.74 kJ B) -171.08 kJ C) 88.00 kJ D) -259.09 kJ

icang [17]

Answer:

Option C. 88 KJ

Explanation:

The activation energy (Ea) is the minimum energy that reactant must overcome in order for them to proceed to product.

In an energy profile diagram, the activation energy (Ea) is obtained by calculating the difference between the energy of the activation complex (i.e peak) and the energy of the reactant.

With the above information, we shall determine the activation energy (Ea) of the reaction above as follow:

Activation complex = 268.74 KJ

Energy of reactant = 180.74 KJ

Activation energy (Ea) =?

Activation energy = Activation complex – Energy of reactant

Activation energy = 268.74 – 180.74

Activation energy = 88 KJ

Therefore, the activation energy (Ea) of the reaction is 88 KJ

8 0

4 years ago

What is the number of carbon atoms in a cycloalkyne with 8 hydrogen atoms

Slav-nsk [51]

Answer:

Explanation:

C4H8

7 0

3 years ago

1. How many moles of calcium are in 525g Ca?

Novosadov [1.4K]

Answer:

13.1743

Explanation:

1 grams Calcium to mol = 0.02495 mol

6 0

3 years ago

What are desirable characteristics of a barium suspension? 1. Rapid flow 2. Thick layering 3. Good mucosal adhesion

choli [55]

Answer:

The desirable characteristic of Barium suspension are:

Thick layering

Explanation:

First know the meaning of the terms :

1. Rapid flow

2. Thick layering

3. Good mucosal adhesion\

1. Rapid flow : The lower the viscosity of the solution , more is its flow in the solution. For example : Honey has more viscosity so it flows slowly . On the other hand water flow faster.

2. Thick layering : layering is the deposition of one layer of the liquid over other. The deposited layer can be of different substance.

3. Mucosal Adhesion : It is the adhesion(attraction) between two materials ,one of which is mucous.It is attractive force between the drug and the mucus inside the body.

Barium suspension:

It is not a Good mucosal adhesion material because of low solubility in water and lipid .

Only those solution are good in adhesion which have higher solubility in water.

It is widely used as the contrast media for the examination of gastrointestinal because of its Thick Layering Property. It has the consistency of thick glass . At room temperature it is called "warm thick milk"

3 0

3 years ago

10.7g of C2H2 --> g CO2

kicyunya [14]

Answer:

http://www.khalidshadid.com/uploads/3/9/2/0/3920808/raymond_chang-chemistry_10th_edition.pdf

Explanation:

http://www.khalidshadid.com/uploads/3/9/2/0/3920808/raymond_chang-chemistry_10th_edition.pdf

5 0

3 years ago