Compounds, Formulae And Equations 2.1.2

Question 1

How can the ionic charge of an element be predicted?

Answer 1

From the position of an element in the periodic table

Elements in specific groups of the periodic table typically exhibit characteristic ionic charges.

Question 2

What is the formula for the nitrate ion?

Answer 2

NO3–

Nitrate is a common polyatomic ion used in various chemical reactions.

Question 3

What is the formula for the carbonate ion?

Answer 3

CO32–

Carbonate is widely found in natural substances and is important in biogeochemical cycles.

Question 4

What is the formula for the sulfate ion?

Answer 4

SO42–

Sulfate plays a significant role in environmental chemistry and biological processes.

Question 5

What is the formula for the hydroxide ion?

Answer 5

OH–

Hydroxide is commonly encountered in bases and is crucial in acid-base chemistry.

Question 6

What is the formula for the ammonium ion?

Answer 6

NH4+

Ammonium is a key ion in nitrogen metabolism and fertilizers.

Question 7

What is the formula for the zinc ion?

Answer 7

Zn2+

Zinc ions are essential for many biological enzymes and processes.

Question 8

What is the formula for the silver ion?

Answer 8

Ag+

Silver ions are known for their antimicrobial properties and are used in various applications.

Question 9

What is required for constructing balanced chemical equations?

Answer 9

State symbols, an equal ammount of atom on both sides and correct formukar

Balanced equations are essential for understanding the conservation of mass in reactions.

Question 10

Fill in the blank: The formula for the sulfate ion is _______.

Answer 10

SO42–

This ion is often encountered in various chemical reactions and compounds.

Question 11

True or False: The ionic charge can be determined solely by the atomic mass of an element.

Answer 11

False

Ionic charge is primarily determined by the position of an element in the periodic table, not its atomic mass.

Question 12

Construct a balanced equation between aluminium and oxygen to form aluminium oxide. Include state symbols.

Answer 12

1. Work out the formulae of aluminium oxide. aluminium form 3+ ions and oxygen form 2- ions. Therefore, aluminium oxide is Al2O3.
2. Balance the equation by placing numbers in front of the formulae
3. 4Al (s) + 3O2 (g) —> 2Al2O3 (s)

Question 13

Write formulae for potassium oxide, ammonium carbonate, and Iron (II) nitrate

Answer 13

Potassium oxide = K2O
Ammonium carbonate = (NH4)2CO3
Iron (II) nitrate = Fe(NO3)2

Question 14

Name the following compounds: (NH4)3PO4, Fe2(SO4)3, AlN

Answer 14

Ammonium phosphate, Iron (iii) sulphate, Aluminium nitride

Question 15

Balance the following equation:
Zn (s) + HNO3 (aq) —> Zn(NO3)2 (aq) + NO (g) + H2O (l)

Answer 15

3Zn (s) + 8HNO3 (aq) —> 3Zn(NO3)2 (aq) + 2NO (g) + 4H2O (l)

Question 16

Write equation for: magnesium and solid phosphorus to form solid magnesium phosphide

Answer 16

6Mg (s) + P4 (s) —> 2Mg3P2 (s)

Question 17

Write equation for iron reacting with aqueous copper nitrate to form copper and aqueous iron (iii) nitrate

Answer 17

2Fe + 3Cu(NO3)2 —> 3Cu + 2Fe(NO3)3

Question 18

Write equation for iron reacting with aqueous copper nitrate to form copper and aqueous iron (iii) nitrate

Answer 18

2Fe + 3Cu(NO3)2 —> 3Cu + 2Fe(NO3)3

Question 19

What elements are diatomic?

Answer 19

Hydrogen (H), nitrogen (N), oxygen (O), fluorine (F), chlorine (Cl), bromine (Br), and iodine (I)

Question 20

What is the formula of small molecules phosphorus and sulphur

Answer 20

P4 and S8 (however usually written as S in equation)