question 4 options:
The correct formula is the first one.
Copper has two valences I and II, in this example, it's mentioned that copper's valence is I.
Then we have to look in all the formulas for one formula where copper has that valence, and that valence is in formula 1 and 3. Number 4 is discarted that formula is incorrect, that formula doesn't exist.
Number 2 is also discarted because in this formula Cu has a valence of 2.
Number three is discarted because here Bromide has a valence of 2 and that is incorrect, Bromide's valence is 1.
Explanation: Copper has an oxidation of Cu+1 and Phosphate a polyatomic ion is PO4 -3
Do the criss cross rule on their charges as the charge of Copper will be the subscript pf PO4 and vice versa.
CuSO4(H2O)3 is the correct answer for your question.
Cu₂SO₄ · 3 H₂OExplanation:
First of all we should be interested in the oxidation number carried out by Copper atom because it can exist both in +1 and +2 state. Hence, as shown in name i.e. (I), it shows that copper is having +1 oxidation state.
Secondly, we should be interested in the charge carried out by sulfate ion, as it is conjugate base of sulfuric acid so, it must contain a charge of -2.
Therefore, to neutralize -2 charge of SO₄²⁻ ion we have to add two Cu⁺¹ ions hence,
Furthermore, the number of water molecules are three as the word tri- specifies three.
Cu₂SO₄ . 3 H₂ORemember:
In naming ionic compounds the positive part is named first followed by negative ion.
I took it just now and it is correct
CuSO₄ · 3H₂O
Sulfate, SO₄²⁻, has a charge of -2, while copper(I) has a charge of +1. For the charges to cancel and produce a neutral salt, there must be two copper(I) ions for every sulfate.
The copper(I) sulfate salt may absorb water from its environment to produce a hydrate. The water molecules can usually be removed from the salt by heating and are not bonded directly to the copper(I) ion, but instead are included in the lattice structure of the salt.
The number of water molecules per unit of the salt is indicated and written after the formula for the salt, separated by a dot.
The formula CuSO₄(H₂O)₃ indicates that the water is bonded directly to the copper(I) and is not a hydrate.
This problem can be solved by using oxidation states. The oxidation state is based on the electrons an atom loses or gain, or appears to use when forming compounds.To find the formula for Copper (I) Sulfide, we have to first consider the individual ions that come together to form it. Copper (I) is an ion of copper that has a charge of +1, i.e . Sulfur is an element in group 6 of the periodic table. The sulfur ion has a charge of -2, i.e . To form Copper (I) Sulfide, which is electrically neutral, we need 2 Copper (I) ions and 1 sulfur ion.
The reaction is represented by the equation below
The correct answer is (C)
the device is called “ rocket engine”