Chemistry, 03.01.2020 04:31 lauraabosi

Do both members of the following pairs have the same number of protons? neutrons? electrons?

Answers: 2

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Answers

You have to use this knwoledge:

1) The superscript number on the left of the symbol is the mass number (A)

2) The underscript number on the left of the symbol is the atomic number (Z)

3) The atomic number, Z, is the number of protons of the atom.

4) The number of electrons of an atoms is equal to the number of protons.

5) The mass number, A is equal to the number of neutrons, N, plus the number of protons, Z, i.e. A = N + Z, from which you obtain N = A - Z

Now I am going to apply above rules to solve the three cases for you.

I will use other notation just because the editor does not permit to place superscripts and underscripts on the left of the symbol.

a) 62 Cu 29 and 62 Zn 39

62 Cu 29:

Z = 29 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 29 = 33
Number of electrons = number of protons = 29

62 Zn 39:

Z = 39 = number of protons
A = 62 = N + Z => N = 62 - Z = 62 - 39 = 23
Number of electrons = number of protons = 39

Answers:

protons are not equal
neutrons are not equal
electrons are not equal.

b) 40Ar18 and 41K19

40Ar18:

Z = 18 = number of protons
A = 40 = N + Z => N = 40 - 18 = 22 = number of neutrons
number of electrons = number of protons 18

41K19:

Z = 19 = number of protons
A = 41 = N + Z> N = 41 - 19 = 22
number of electrons = number of protons = 19

Answers:

protons are not equal
neutrons are equal
electrons are not equal

c) 14N7 and 15N7

14N7:

Z = 7 = number of protons
A = 14 => N = 14 - 7 = 7 = number of neutrons
number of elecfrons = number of protons = 7

15N7:

Z = 7 = number of protons
A = 15 => N = 15 - 7 = 8 = number of neutrons
number of electrons = number of protons = 7

Answers:

protons are equal
neutrons are not equal
electrons are equal

Answer from: Quest

answer: $2c_5h_5+1fe\rightarrow 1fe(c_5h_5)_2$

the reaction is type of combination reaction.

explanation:

$? c_5h_5+? fe\rightarrow ? fe(c_5h_5)_2$

on the product side, there are 2 molecules of $c_5h_5$ bonded to fe which means one atom of fe are combined two molecules of $c_5h_5$ . so, balanced chemical equation becomes :

$2c_5h_5+1fe\rightarrow 1fe(c_5h_5)_2$

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

$a+b\rightarrow ab$

Answer from: Quest

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

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