SCH3U Test #2 (Ch. 3+4) Flashcards
What are the melting points of ionic compounds vs. molecular compounds?
Ionic = high melting pt, molecular = low melting pt.
What are the conductivity levels of ionic vs. molecular/covalent compounds as liquids?
Ionic = high conductivity, covalent = low conductivity
What are the states at room temperature of molecular/covalent vs. ionic compounds?
Molecular = solid, liquid or gas Ionic = crystalline solid
What is the solubility in water of ionic compounds vs. molecular compounds?
Ionic = high solubility, molecular = low solubility (both are tentative)
What are the electrical conductivities when dissolved in water of molecular vs. ionic compounds?
Covalent = not usually conductive, ionic = conductive
What type of chemical reaction is this: Pb(NO3)2 + 2 KI —> PbI2 + 2 KNO3
Double Displacement
What type of chemical reaction is this: 2 H2O —> 2 H2 + O2
Decomposition
What type of chemical reaction is this: 8 Fe + S8 —> 8 FeS
Synthesis
What type of chemical reaction is this: C10H8 + 12 O2 —> 10 CO2 + 4 H2O
Combustion
What type of chemical reaction is this: Mg + 2 H2O —> Mg(OH)2 + H2
Single Displacement
What will be the products of the following reaction: HBr + NaOH —>
HBr + NaOH —> NaBr + H2O (acid/base reaction produces water)
What will be the product(s) of the following reaction: 2 H2O —>
2 H2O —> 2 H2 + O2
What will be the product(s) of the following reaction: 8 Fe + S8 —>
8 Fe + S8 —> 8 FeS
What will be the product(s) of the following reaction: Pb(NO3)2 + 2 KI —>
Pb(NO3)2 + 2 KI —> PbI2 + 2 KNO3
What will be the product(s) of the following reaction be? C10H8 + 12 O2 —>
C10H8 + 12 O2 —> 10 CO2 + 4 H2O
Predict the products of the following reaction: Mg + 2 H2O —>
Mg + 2 H2O —> Mg(OH)2 + H2
What are the 5 different shapes of polar molecules?
Linear, angular/bent, trigonal pyramidal, trigonal planar, tetrahedral.
What shape of molecule is this?
Trigonal pyramidal
What shape of molecule is this?
Trigonal planar
What shape of molecule is this?
Tetrahedral
Are trigonal planar molecules symmetrical?
No, they are asymmetrical because of the lone electron pair on the central atom.
Are tetrahedral molecules symmetrical?
They are symmetrical if the non-central atoms are the same.
Are trigonal planar molecules symmetrical?
They are typically asymmetrical unless the 3 non-central atoms are the same.
What is the electronegativity difference between atoms in a polar bond?
Anywhere from 0.5-1.7
