Question

1. look at the second word in the compounds name and identify the element. only the root of the elements name is used so the ending will be different. write the symbol for the element referred to. 4. determine the number of atoms that the prefix of the second name refers to and write this number after the second symbol as a subscript. example dinitrogen pentasulfide symbol of 1st element 1st element prefix 1st element no. of atoms symbol of 2nd element 2nd element prefix 2nd element no. of atoms chemical formula n di n₂ s penta s₅ n₂s₅ practice exercises write the chemical formula for each of the following compounds. 1. tetraboron monocarbide __________ 6. argon hexaoxide ________ 2. carbon monophosphide ________ 7. dihydrogen monoxide ________ 3. dinitrogen monosulfide ________ 8. xenon tetrafluoride ________ 4. tetraoxygen difluoride ________ 9. ditellurium decafluoride ________ 5. dichlorine monoxide ________ 10. trisilicon tetraphosphide __________ chemistry 2a - sa 3 writing chemical formulas page 7

Explanation:

Step1: Identify first - element symbol and prefix

For each compound, identify the symbol of the first - named element and the prefix indicating the number of its atoms. If no prefix is present for the first element, it is assumed to be 1.

Step2: Identify second - element symbol and prefix

Identify the symbol of the second - named element and the prefix indicating the number of its atoms. Write the number of atoms as a subscript after the symbol.

Step3: Write chemical formula

Combine the symbols and subscripts to form the chemical formula.

1. For Tetraboron monocarbide:

• First element: Boron (B), prefix "tetra" means 4 atoms, so \(B_4\).
• Second element: Carbon (C), prefix "mono" means 1 atom, so \(C\).
• Chemical formula: \(B_4C\)

1. For Carbon monophosphide:

• First element: Carbon (C), no prefix means 1 atom, so \(C\).
• Second element: Phosphorus (P), prefix "mono" means 1 atom, so \(P\).
• Chemical formula: \(CP\)

1. For Dinitrogen monosulfide:

• First element: Nitrogen (N), prefix "di" means 2 atoms, so \(N_2\).
• Second element: Sulfur (S), prefix "mono" means 1 atom, so \(S\).
• Chemical formula: \(N_2S\)

1. For Tetraoxygen difluoride:

• First element: Oxygen (O), prefix "tetra" means 4 atoms, so \(O_4\).
• Second element: Fluorine (F), prefix "di" means 2 atoms, so \(F_2\).
• Chemical formula: \(O_4F_2\)

1. For Dichlorine monoxide:

• First element: Chlorine (Cl), prefix "di" means 2 atoms, so \(Cl_2\).
• Second element: Oxygen (O), prefix "mono" means 1 atom, so \(O\).
• Chemical formula: \(Cl_2O\)

1. For Argon hexaoxide:

• First element: Argon (Ar), no prefix means 1 atom, so \(Ar\).
• Second element: Oxygen (O), prefix "hexa" means 6 atoms, so \(O_6\).
• Chemical formula: \(ArO_6\)

1. For Dihydrogen monoxide:

• First element: Hydrogen (H), prefix "di" means 2 atoms, so \(H_2\).
• Second element: Oxygen (O), prefix "mono" means 1 atom, so \(O\).
• Chemical formula: \(H_2O\)

1. For Xenon tetrafluoride:

• First element: Xenon (Xe), no prefix means 1 atom, so \(Xe\).
• Second element: Fluorine (F), prefix "tetra" means 4 atoms, so \(F_4\).
• Chemical formula: \(XeF_4\)

1. For Ditellurium decafluoride:

• First element: Tellurium (Te), prefix "di" means 2 atoms, so \(Te_2\).
• Second element: Fluorine (F), prefix "deca" means 10 atoms, so \(F_{10}\).
• Chemical formula: \(Te_2F_{10}\)

1. For Trisilicon tetraphosphide:

• First element: Silicon (Si), prefix "tri" means 3 atoms, so \(Si_3\).
• Second element: Phosphorus (P), prefix "tetra" means 4 atoms, so \(P_4\).
• Chemical formula: \(Si_3P_4\)

Answer:

1. \(B_4C\)
2. \(CP\)
3. \(N_2S\)
4. \(O_4F_2\)
5. \(Cl_2O\)
6. \(ArO_6\)
7. \(H_2O\)
8. \(XeF_4\)
9. \(Te_2F_{10}\)
10. \(Si_3P_4\)