6th Grade Science – Week 18
1. What is the chemical formula for the ionic compound, calcium chloride?
(A) CaCl
(B) CaCl2
(C) Ca2Cl
(D) CaCl
2. What is the chemical formula for the ionic compound, potassium sulfide?
(A) KS
(B) KS2
(C) K2S
(D) K2S2
3. What is the chemical formula for the ionic compound, iron (III) oxide?
(A) Fe3O
(B) Fe3O2
(C) Fe2O3
(D) FeO
4. What is the chemical formula for the ionic compound, potassium sulfate?
(A) K2SO4
(B) K2S
(C) KSO4
(D) P2SO4
5. What is the chemical formula for the ionic compound, magnesium phosphate?
(A) Mg3P2
(B) MgPO4
(C) Mg3(PO4)2
(D) Mg3PO42
6. What is the chemical formula for the ionic compound, zinc (II) nitrate?
(A) Zn3N2
(B) Zn(NO3)
(C) Zn(NO3)2
(D) Zn2(NO3)
7. What is the difference between an ionic compound and a covalent molecule?
(A) Ionic compounds share electrons whereas covalent molecules transfer electrons.
(B) Ionic compounds are two ions whereas covalent molecules are mixtures of atoms.
(C) Ionic compounds are metals and nonmetals whereas covalent molecules are one or more metals.
(D) Ionic compounds transfer electrons whereas covalent molecules share electrons.
8. What is the correct name for the covalent molecule, CO2?
(A) Carbon oxide
(B) Carbon dioxide
(C) Monocarbon dioxide
(D) Carbonite
6th Grade Science – Week 18
9. What is the chemical formula for the covalent molecule, nitrogen trihydride?
(A) NH3
(B) NH
(C) N3H
(D) (NH)3
10. What state of matter are most ionic compounds and covalent molecules at standard temperature and
pressure?
(A) Ionic compounds are liquids and covalent molecules are solids
(B) Ionic compounds are liquids and covalent molecules are gases
(C) Ionic compounds are solids and covalent molecules are solids
(D) Ionic compounds are solids and covalent molecules are liquids and gases