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Murljashka [212]
3 years ago
14

HELP ME PLEASE

Chemistry
1 answer:
lions [1.4K]3 years ago
3 0

Answer:

A

Explanation:

Definitely not in the cell theory

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Give the four symbols for physical states of reactants and products, and tell what each means.
pshichka [43]
We are going to use table salt, NaCl as an example.

(s) = solid, eg the salt you put on your food is a crystalline solid. 
(l)  = liquid, if you melt salt it take on a liquid form
(g)  = gaseous, if you put enough energy in the salt will turn into a gas.
(aq) = aqueous, meaning in water or another solvent. If you put some table salt in water and stir it, it will dissolve, the NaCl molecules dont get destroyed but they dissolve becoming part of the liquid. 
6 0
3 years ago
If 2 moles of salt is dissolved to form 1 liter of solution, what is the molarity of the solution?
Semenov [28]

Answer:

2M

Explanation:

Molarity refers to the molar concentration of a solution. It can be calculated by using the formula as follows:

Molarity (M) = number of moles (n) ÷ volume (V)

Based on the information provided in this question, 2 moles of salt is dissolved to form 1 liter of solution. This means that n = 2mol, V = 1L

Molarity = n/V

Molarity = 2/1

Molarity = 2M

8 0
3 years ago
The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and
Sophie [7]

Answer:

Electrons

Explanation:

Isotopes are atoms which have the same number of protons and electrons but a different number of neutrons. This is also the reason why there are no other changes in the atom but the mass of the specific atom changes.

Hope this helps :)

Merry Christmas. Have fun.

4 0
3 years ago
A 0.420 M Ca(OH)2 solution was prepared by dissolving 64.0 grams of Ca(OH)2 in enough water. What is the total volume of the sol
nikitadnepr [17]

The volume of the solution is given below which can be calculated using the molarity formula as 2.18 litres.

<h3>Define the molarity of a solution.</h3>

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}

Given data:

M= 0.420M

mass = 64.0 grams

Molar Mass= 74g/mol

To find:

The volume of solution=?

The calculation for a number of moles:

n= \frac{m}{M}

n= \frac{64}{70}

n= 0.91 moles

Molarity=  \frac{n}{V}

V= \frac{0.91}{0.420}

V= 2.1768 litres

Thus, the volume of the solution is 2.18 litres.

Find more information about Molarity here:

brainly.com/question/26873446

#SPJ1

6 0
2 years ago
Which class of compunds has the general formula r-o-r​
Hatshy [7]

Answer:

R-O-R is the general formula for Symmetrical Ethers,in which both alkyl groups attached on oxygen are same .

Explanation:

Please mark brainliest and have a great day!

4 0
3 years ago
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