Which statements correctly match a chemical name with its formula? Use the list of polyatomic ions and the periodic table to hel
p you answer.
The chemical formula for ammonium carbonate is NH4HCO3.
The chemical formula for ammonium hypochlorite is NH4ClO.
The chemical formula for ammonium nitrate is NH4NO3.
The chemical formula for ammonium phosphate is NH4(PO4)3.
The chemical formula for ammonium sulfate is (NH4)2SO3.
The chemical formula for ammonium carbonate is NH4HCO3.
The chemical formula for ammonium hypochlorite is NH4ClO.
The chemical formula for ammonium nitrate is NH4NO3.
The chemical formula for ammonium phosphate is NH4(PO4)3.
The chemical formula for ammonium sulfate is (NH4)2SO3.
2 answers:
Answer : The correct statements are,
The chemical formula for ammonium hypochlorite is .
The chemical formula for ammonium nitrate is .
The chemical formula for ammonium sulfate is .
Explanation :
Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.
(1) The chemical formula for ammonium carbonate is .
This formula is formed when the 2 ammonium ion combine with 1 carbonate ion.
(2) The chemical formula for ammonium hypochlorite is .
This formula is formed when the 1 ammonium ion combine with 1 chloride ion and 1 oxide ion.
(3) The chemical formula for ammonium nitrate is .
This formula is formed when the 1 ammonium ion combine with 1 nitrate ion.
(4) The chemical formula for ammonium phosphate is .
This formula is formed when the 3 ammonium ion combine with 1 phosphate ion.
(5) The chemical formula for ammonium sulfate is .
This formula is formed when the 2 ammonium ion combine with 1 sulfate ion.
Answer : The correct statements are,
The chemical formula for ammonium hypochlorite is .
The chemical formula for ammonium nitrate is
Explanation :
Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.
All the polyatomic ions always form an ionic compound.
Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.
(1) The chemical formula for ammonium carbonate.
The given compound ammonium carbonate is an ionic compound. It is made up of two different ions which are ammonium ion and carbonate ion
by the criss-cross method. Thus, the correct chemical formula for ammonium carbonate is
.
(2) The chemical formula for ammonium hypochlorite.
The given compound ammonium hypochlorite is an ionic compound. It is made up of two different ions which are ammonium ion and hypochlorite ion
by the criss-cross method. Thus, the correct chemical formula for ammonium hypochlorite is
.
(3) The chemical formula for ammonium nitrate.
The given compound ammonium nitrate is an ionic compound. It is made up of two different ions which are ammonium ion and nitrate ion
by the criss-cross method. Thus, the correct chemical formula for ammonium nitrate is
.
(4) The chemical formula for ammonium phosphate.
The given compound ammonium phosphate is an ionic compound. It is made up of two different ions which are ammonium ion and phosphate ion
by the criss-cross method. Thus, the correct chemical formula for ammonium phosphate is
.
(5) The chemical formula for ammonium sulfate.
The given compound ammonium sulfate is an ionic compound. It is made up of two different ions which are ammonium ion and sulfate ion
by the criss-cross method. Thus, the correct chemical formula for ammonium sulfate is
.
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Answer:
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Thus in the reactants, there are 2 atoms of hydrogen and 2 atoms of iodine .Thus there has to be 2 atoms of hydrogen and 2 atoms of iodine in the product as well. Thus a coefficient of 2 is placed in front of HI.
The balanced chemical reaction is:
If the coulombs are supplied at 1.44 V, then 4.766 × 10¹¹ joules are produced.
(a) The reaction is
2H₂O + 2e⁻ → H₂ + 2OH⁻
According to the reaction, 2 moles of electrons flow per mole of reaction,
(b) Given
T = 25°C
Change Celsius into Kelvin
T = 25°C
= (25 + 273 ) K
= 298 K
<h3>What is Ideal Gas Law ?</h3>It is expressed as
PV = nRT
Hence ,
n =
=
= 1.7176 ×10⁶ mole
Now, From the given reaction we can say that ,1 mole of H₂ is produced by 2 moles of electron
Hence, 1.7176 × 10⁶ mole of H₂ is produced by
= 2 × 1.7176 × 10⁶ moles of electron
= 3.435 ×10⁶ moles of electron
We know that
charge = moles of electron × F
= (3.435 ×10⁶ × 96500) C
= 3.31 × 10¹¹ C
(c) We know that,
Voltage = =
1.44 V =
Energy = 1.44 V × 3.31 × 10¹¹ C
= 4.766 × 10¹¹ Joules
Thus from the above conclusion we can say that, coulombs are supplied at 1.44 V, then 4.766 × 10¹¹ joules are produced.
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Question : Car manufacturers are developing engines that use H₂ as fuel. In Iceland, Sweden, and other parts of Scandinavia countries, where hydroelectric plants produce inexpensive electric power, the H₂ can be made industrially by the electrolysis of water.
a) How many moles of electrons flow per mole of reaction ?
b) How many coulombs are needed to produce 3.53X10⁶ L of H₂ gas at 12.0 atm and 25°C.
c) If the coulombs are supplied at 1.44 V, how many joules are produced?
<u>Answer:</u> The percent composition by mass of hydrogen in given compound is 6.33 %
<u>Explanation:</u>
We are given:
A chemical compound having chemical formula of
It is made up by the combination of 1 nitrogen atom, 5 hydrogen atoms, 1 carbon atom and 3 oxygen atoms
To calculate the percentage composition by mass of hydrogen in the compound, we use the equation:
Mass of compound =
Mass of hydrogen =
Putting values in above equation, we get:
Hence, the percent composition by mass of hydrogen in given compound is 6.33 %