Which of the following is a way that materials are used?

skad [1K]

Answer:

45 joules to calories= 10 (10.755258) calories

3 0

4 years ago

Ethyl acetate can be prepared by an SN2 reaction. Draw the alkylbromide and nucleophile used in the reaction. Remember to includ

bulgar [2K]

Answer:

Few important points related to $S_N2$ reaction:

1. $S_N2$ is a one-step reaction that follows second order kinetics.

2. In $S_N2$ reaction, a transition state is formed in situ.

3. Strong nucleophiles like $OH^- \ or\ CN^-$ are used in case of bi-molecular nucleophilic substitution reaction.

Ethyl acetate can be prepared by a second-order nucleophilic substitution reaction between acetic acid and ethyl bromide.

The reaction between acetic acid and ethyl bromide is drawn below:

8 0

3 years ago

Read 2 more answers

Both obsidian and pumice are formed from which of the following ?

Mashutka [201]

Answer:

option D= volcanoes

Explanation:

Obsidian:

It is igneous rock. It is made when molten rock material cool very rapidly in such a way that atoms could not arrange themselves and acquire amorphous form. It is also called mineraloid.

1. Mostly it is found in black color but it could be present in green or brown color.

2. In the form of glass obsidian are unstable and start to crystallize.

3. Obsidian are commonly found in New Zealand, Hungry, Russia, Canada, Italy, Argentine, Japan, Chile, Kenya, Peru and United States.

4. older obsidian can not be found because these glassy rocks destroyed very rapidly.

5. Obsidian are used in surgical tools for cutting.

6. obsidian are also used in jewelry.

Pumice:

pumice is volcanic rock. it is formed from the lava having high amount of gases and water content. the gas escape and frothy lava cool very rapidly and form very lighter rock material, called pumice.

1. it is lighter in color because of high content of silica.

2. its crushing material produce fine powder, called volcanic ash.

3. its density is very low that's way it floats on the surface of water.

4. it is used in the manufacturing of cement and also in pencil erasers.

5. it is found in Greece, Italy, Chile, Turkey, Russia , Tran, Syria ans United States.

6 0

3 years ago

PLEASE HELP ME ASAP!!!! PLEASE!!!!!!!!!! I will give brainliest and 20 points!! PLEASE!

Vika [28.1K]

#1
<span>The rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.
#2
shape, molecular weight. I don't know for sure though
#3
</span>O2, N2, Ar, H2O vapor

5 0

3 years ago

Hello

nordsb [41]

Answer:

The ratio of the number of atoms of gold and silver in the ornament is 197 : 1080.

Explanation:

Let the mass of silver ornament be x.

Mass of gold polished on an ornament = 1% of x= 0.1 x

Moles of silver = $\frac{x}{108 g/mol}$