What is around us? “Chemistry is Life”
Focus Questions
1) What types of compounds do you know? Give a few examples
H2O , CO2 , NaCl, SO2 , HCL
2) When naming different types of compounds do you need to follow different rules?
Explain using examples.
Yes, you need to follow different rules. For covalent compounds, you need to add “ide” at the
end of the second element. So for example, if we are naming hydrogen and fluorine together, we
would say “ Hydrogen Fluoride. For ionic compounds, we use roman numerals which indicates
the charges of the ions.
3) Does it matter in which order you combine your elements when writing chemical
formulas for ionic compounds?
Yes, it matters. The cation comes first, and the anion, second.
4) Which laws govern the formation of compounds?
The law of conservation of mass, definite proportions, and multiple proportions
Post-Lab Assessment Questions
1. For the following pairs of ions, write the formula of the compound that you would expect
them to form
a. Magnesium and hydroxide: Mg (OH)2
b. manganese (IV) and oxygen: MnO2
c. Cobalt (III) and sulfite : Co2(SO3)3
2. Platinum is a transition metal and forms two different ions, Pt2+ and Pt4+. Write the formulas
for the compounds for each platinum ion with:
a. Fluorine ions :
Pt2+ : PtF2
Pt4+: PtF4
b. Cyanide ions
Pt2+ : Pt (CN)2
Pt4+: Pt (CN)4
c. Chromate ions
Pt2+ PtCrO4
Focus Questions
1) What types of compounds do you know? Give a few examples
H2O , CO2 , NaCl, SO2 , HCL
2) When naming different types of compounds do you need to follow different rules?
Explain using examples.
Yes, you need to follow different rules. For covalent compounds, you need to add “ide” at the
end of the second element. So for example, if we are naming hydrogen and fluorine together, we
would say “ Hydrogen Fluoride. For ionic compounds, we use roman numerals which indicates
the charges of the ions.
3) Does it matter in which order you combine your elements when writing chemical
formulas for ionic compounds?
Yes, it matters. The cation comes first, and the anion, second.
4) Which laws govern the formation of compounds?
The law of conservation of mass, definite proportions, and multiple proportions
Post-Lab Assessment Questions
1. For the following pairs of ions, write the formula of the compound that you would expect
them to form
a. Magnesium and hydroxide: Mg (OH)2
b. manganese (IV) and oxygen: MnO2
c. Cobalt (III) and sulfite : Co2(SO3)3
2. Platinum is a transition metal and forms two different ions, Pt2+ and Pt4+. Write the formulas
for the compounds for each platinum ion with:
a. Fluorine ions :
Pt2+ : PtF2
Pt4+: PtF4
b. Cyanide ions
Pt2+ : Pt (CN)2
Pt4+: Pt (CN)4
c. Chromate ions
Pt2+ PtCrO4
