Properties of Matter and the Periodic Table
Predicting Products and Balancing Equations
Factors Affecting Chemical Reactions
The Mole
Acids and Bases
100
What is the chemical bond formed between two non-metals?
What is covalent/molecular?
100
What type of equation is this? Predict the products and balance
NH3 + HCl ----> ?
Synthesis, NH4Cl
100
What effect does surface area have on a chemical reaction? Provide an example.
It speeds up the rate of chemical reaction. Marble chips vs marble powder.
100
What is Avogadro's number?
6.022 x 1023
100
What ions are present in acids and what are present in bases?
H+ ; acids, OH- ; bases
200
What is the chemical formula for aluminum sulfide?
Al2S3
200
Predict the products and balance the equation:
C2H4 + 3O2 ----> ?
2CO2 + 2H2O
200
Why do catalysts not appear in the chemical equation?
They are not an end product in the equation and do not change throughout the chemical reaction.
200
How many moles are in 15 grams of lithium?
2.16 moles
200
What is the difference between acids in bases in terms of H+ ions?
acids produce them while bases accept them
300
How many of each element are needed when phosphorous and chlorine bond?
1 P and 3 chlorine
300
What type of reaction is this? What are the products? Balance the equation.
RBNO3 + BeF2
Does not happen because all products are aq.
300
What are the five factors affecting chemical reactions?
size, concentration, temperature, surface area, and the presence of a catalyst
300
What are the molar masses of each side of the equation?
C2H4 + 3O2 ---> 2CO2 + 2H2O
124.052, 124.052
300
What substance would turn green with bromothymol blue and stay clear in phenolphthalein?
Water (any neutral compound)
400
Find the formula of Iron (III) Carbonate
Fe2(CO3)3
400
What is the difference between these two equations and explain the reason why:
CH4 + 2O2 -----> CO2 + 2H2O
4CH4 +5O2 -----> 2CO + 8H20 + 2C
The first one is complete combustion while the second one is incomplete combustion. The reason for this is because there was not enough oxygen to react with the fuel in order to produce carbon dioxide and water.
400
What is the difference between bond energies in endothermic and exothermic reactions?
In exothermic reactions, the energy that is released when new bonds form is greater than the energy needed to break them.
In endothermic reactions, the energy needed to break them is greater than the energy released.
400
It has been estimated that 93% of all atoms in the entire universe are hydrogen and that the vast majority of those remaining are helium. Based on only these two elements, estimate the mass percentage composition of the universe.
Mass percentage of Hydrogen = 76.86%
Mass percentage of Helium = 23.14%.
400
What are the products of a neutralization reaction?
Water and an ionic compound
500
What element is this?
2, 8, 18, 18, 1
Silver (Ag)
500
Sodium metal reacts with hydrochloric acid, HCl, and produces hydrogen gas as one of the products. What is the full equation (balanced and products)?
2Na + 2HCl ---> 2NaCl + H2
500
Looking at the graph on the right, what does this show? Explain why.
An endothermic reaction because the products are at a greater energy level than the reactants
500
How many moles of Na+ ions are present in 20 mL of 0.40M Na3PO4?
0.024
500
What happens when a solution of an acid is mixed with a solution of a base in a test tube (two)?
1. The temperature of the solution increases
2. Salt formation takes place