Ionic Bonds
Covalent Bonds
Chemical Reactions
Mixed Practice
100
When using the octet rule, which group uses the cation plus 3 (+3), to obtain stability?
A. Group 1
B. Group 7
C. Group 3
D. Group 3
The Octet Rule is used to find how many electrons must be added, or taken away, in order for an atom to obtain stability. The different groups, have different charges
100
What is the correct covalent formula for diphosphorus pentoxide?
A. P3 O10
B. P5 O2
C. P2 O5
D. P8 O9
C. P2 O5
Di is the meaning of two, therefore phosphorus has 2 atoms, while oxygen uses penta, which is the suffix of 5.
100
Michael is given the chemical equation PCl5 + 4H2 O, as a reactant. What is the perfectly balanced product of the chemical equation?
H3 PO4 + 5HCl
This is simply the balanced product of the reactants, of the previous chemical equation.
100
Write and balance this chemical equation?
____ Pb(OH)2 + ____ HCl ____ H2O + ____ PbCl2
1 Pb(OH)2 + 2 HCl 2 H2O + 1PbCl2
You simply just have to write the equation CORRECTLY and balance it.
200
When does a Electrostatic Attraction take place, to achieve a stable octet and why?
A. Metals, which are anions attract to Non-Metals, which are cations, because they’re oppositely charged ions
B. Non-Metals, which are anions attract to Metals, which are cations, because they’re oppositely charged ions
C. A stable octet is only formed, when using two stable ions
B. Non-Metals, which are anions attract to Metals, which are cations, because they’re oppositely charged ions
Electrostatic Attraction can only occur, when there are two different charges. Non-Metals create an anion, which are negatively charged, while Metals create cations, which are positively charged ions. Therefore, B would be the correct answer, for this question.
200
In a covalent equation, how many moles are used to make up two moles of phosphorus trichloride (PCl3)?
A. 8
B. 4
C. 6
D. 9
A. 8
PCl3 #1:
P=1 mole
Cl= 3 moles
Total: 4 moles
PCl3 #2:
P=1 mole
Cl= 3 moles
Total: 4 moles
200
Which answer holds three diatomic elements, you MUST pick three?
A. S2 , I2 , Br2
B. Cl2 , N2 , Au2
C. O2 , Mg2 , F2
D. F2 , N2 , Cl2
D. F2 , N2 , Cl2
They’re all diatomic atoms, that are pure and form molecules, with two existing atoms.
200
What is the molar mass for pentanitrogen tetrachloride?
A. 213.45
B. 106.79
C. 211.9
D. 489.8
C. 211.9
Nitrogen:
14.01x5= 70.05
Chlorine:
35.45x4= 141.8
Total: 211.85 or 211.9
300
Calculate the molar mass of Fe2O3 ?
A. 182.95
B. 199.53
C. 159.67
D. 157.8
B. 199.53
The reason B is the correct answer is because, we have to switch the subscripts back to their original superscript form, in order to find the true Molar Mass of Iron Oxide.
300
When asked about the shape of the covalent molecules, Paul described it as having one lone pair, a central atom, and three surrounding atoms. What was the shape of the atom described?
A. Bent
B. Tetrahedral
C. Trigonal Pyramidal
D. Linear
E. Trigonal Planar
C. Trigonal Pyramidal
Trigonal planar shapes, tend to have one lone pair, one central atom, and finally three surrounding atoms.
300
What is the difference between Single and Double Replacements?
Single Replacement: Creating one new compound using a new element
Double Replacement: Replaces the cations (or anions) of two ionic compounds
With the Single Replacement you’re simply making one new compound, while using Double Replacement you’re making two new compounds.
300
Predict the following products of these reactants?
AgNO3 + KCl → ….
Br2 + NaF ----> ...
AgCl + KNO3
NO REACTION
The first equation was using Double Replacement, we simply just switch the two elements to form a new compound, then adjust the subscripts if need be. The second equation is using Single Replacement. When using the activity series we see that Bromine can’t take over sodium.
400
N2 (SO4 )3 is the polyatomic formula for which answer?
A. Nitrogen Sulfate
B. Nitrogen Sulfide
C. Nitrogen Sulfite
A. Nitrogen Sulfate
The Sulfate ion, uses the superscript 2 and the subscript 4. Nitrogen also has a superscript of 3. Therefore, when you perform the criss cross method, you end up with this formula.
400
A. Single Bond; 3 electrons
B. Double Bond; 6 electrons
C. Single Bond; 2 electrons
D. Triple Bond; 8 electrons
C. Single-Bond; 2 Electrons
In every single bond, the atoms are sharing two electrons ONLY. A double bond has four, while a triple bond has six.
400
What is the importance of balancing chemical equations, why is it so important to ensure that the reactants and products are equivalent to each other?
A. Molar mass dictates how some elements and compounds are created
B. The Law of Conservation of mass, must be upheld in all chemical equations
C. Single and Double Replacements are needed in order to ensure that the elements and compounds are different on each side.
B. The Law of Conservation of mass, must be upheld in all chemical equations
B is correct, because the Law of Conservation of Mass states that matter cannot be created or transformed in a chemical equation. Therefore, it is important for the reactants to be the same, in number, as the products.
400
When one atom transfers one or more valence electrons to another atom, a(n) __________ is formed?
A. Metallic Bond
B. Ionic Bond
C. Covalent Bond
B. Ionic Bond
500
Which element, from the periodic table, would be a cation, with an oxidation number of +2?
A. Radium
B. Chlorine
C. Gold
D. Both A & C
A. Radium
Radium is located in Group 2A, which contains all cations. Gold is a transition metal, therefore we don’t if it is a cation or an anion
500
Ronald was presented with three properties, for two compounds. The first compound was of a metal and a nonmetal, had a high melting point, and electrons were transferred between atoms. The second compound had a low boiling point, electrons were shared, and it did not conduct electricity. Which of these compounds is most likely to be an ionic compound?
A. Substance #1
B. Substance #2
A. Substance #1
Substance (Compound) number 1 had most of the identifying properties to be an ionic compound, while compound number 2 would be covalent.
500
A group of adults are given different kinds of chemical reactions, in the form of chemical formulas.
A. Zn + HCl → H2 + ZnCl
B. HydroCarbon + O2 → CO2 + H2 O
C.AgNO3 + KCl → AgCl + KNO3
Place these chemical reactions into the correct order, by their types of reactions.
A. Single Replacement; Combustion; Double Replacement
B. Decomposition; Synthesis; Combustion
C. Synthesis; Decomposition; Double Replacemen
A. Single Replacement; Combustion; Double Replacement
Combustion: Usually uses HydroCarbon
Single Replacement: Replaces an element to a compound
Double Replacement: Replaces the two elements in two compounds
500
What is the greatest number of covalent bonds that one carbon atom can form?
Four covalent bonds