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ioda
3 years ago
11

Define crystalline solids with example

Chemistry
1 answer:
Fiesta28 [93]3 years ago
7 0

Crystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organised into a structure known as a crystal. some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

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What is the answer please
padilas [110]

Answer:

A.

Explanation:

A decomposition reaction is when one reactant (the substances to the left of the arrow in the reaction) breaks apart into two or more products (the substances to the right of the arrow).

Because KClO3 is breaking down into KCl and O2, it's a decomposition reaction.

5 0
3 years ago
The effectiveness of nitrogen fertilizers depends on both their ability to deliver nitrogen to plants and the amount of nitrogen
densk [106]

Answer:

Ammonia > Urea > Ammonium nitrate > Ammonium sulphate

Explanation:

Percentage by mass of nitrogen in NH3:

Molar mass of NH3= 17 g/mol

Hence % by mass = 14/17 × 100 = 82.35%

% by mass of NH4NO3

Molar mass of NH4NO3 = 80.043 g/mol

Hence; 28/80.043 × 100 = 34.98%

% by mass of (NH4)2SO4;

Molar mass of (NH4)2SO4= 132.14 g/mol

Hence; 28/132.14 × 100 = 21.19%

% by mass of CH4N2O

Molar mass of urea = 60.0553 g/mol

Hence 28/60.0553 × 100 = 46.62%

8 0
3 years ago
Which of the following are indicators of a chemical change? Select all that apply.
lesya [120]

Answer:

a

Explanation:

7 0
3 years ago
Using relative E values determine which of the following reactions are electrically possible.
ki77a [65]

You should have given us a table, but I think my table shouldn't be too different.

Let's put oxidation numbers first.

Mg^{0}(s)+Br_2^{0}(l) --> Mg^{+2}Br_2^{-2}(?)

You would have to know that Mg(s) is a reducing agent and Br2(l) is an oxidizing agent. But it is pretty common knowledge that the halogens will tend to take the electrons and alkali and alkaline earth metals will tend to give up electrons.

Mg is oxidized because it gives up electrons; Br2(l) is reduced because it gains electrons. Since the reaction conforms to what we would expect to <em>naturally</em> (thermodynamically favored) occur, it can take place given that the activation energy is supplied.

6 0
3 years ago
Convert 4.02 X 1023 atoms Fe to moles
Vaselesa [24]
0.668 moles!



1 mole of Fe weighs 55.845 g.
1 mole has 6.02*10^23 atoms.

(4.02*10^23)/(6.02/10^23) = 4.02/6.02=2.01/3.01=0.668 moles
6 0
3 years ago
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