Show:
Chapter 1
Chapters 1 and 2
Chapter 2
Chapter 3
Chapter 3
100
How many significant digits are in the following number: 0.01082 Solve the following with the correct number of significant digits: (0.050 g + 12.1 g – 6.28 g) ÷ 2.0 mL
4 3.0 g/mL
100
Convert the following: 0.000072 m to micrometers 255.17 to scientific notation
72 um 2.5517x10^2
100
What are isotopes?
Differ in the number of neutrons but have the same number of protons - mass number is different.
100
Calculate the mass percent of sulfur in CaSO4.
23.5% S
100
What are the 5 classes of reactions?
Decomposition Combustion Single displacement Double displacement Synthesis
200
What is the difference between accuracy and precision?
Accuracy - compares values to the true Precision - compares values to each other
200
What are the seven base SI units?
Ampere - electrical quantity Candela - luminous intensity Kelvin - temperature Kilogram - mass Meter - length Second - time Mole - amount of substance in a system
200
What are the seven diatomic elements?
H, N, O, F, Cl, Br, I
200
If you have 3 moles of sodium sulfite, how many moles of sodium do you have?
Na2SO3 6 moles of sodium
200
What is the general form of a single displacement reaction? What is the general form of a decomposition reaction?
A + BC --> B + AC element + compound --> element + compound A --> B + C compound --> element/compound + element/compound
300
What is the equation for density?
D = m/v
300
What is the difference between molecular formulas, structural formulas, and empirical formulas?
Molecular and empirical are similar - empirical is reduced Structural show how elements are bonded to each other in a compound
300
What are the rows and columns called in the periodic table? Give an example of a nonmetal. Give an example of a metal.
Rows - periods Columns - groups Many examples - left of steps vs right of steps
300
Calculate the formula mass of sodium chloride. Calculate the molar mass of sulfuric acid.
58.4 amu 98.1 g/mol
300
What is the limiting reactant?
Determines amount of product formed Completely consumed in the reaction **does not affect the speed of the reaction **not simply the product present in the smallest amount when you read the problem - need calculations!
400
Classify the following matter: sulfur steel salt water ammonia chocolate chip cookies
element solution solution compound heterogeneous mixture
400
Name the following compounds: CO2 H2O NaCl KF
carbon dioxide water sodium chloride potassium fluoride
400
Give an example of an ionic compound. Give an example of a molecular compound.
Many examples! For ionic, make sure balanced using criss-cross rule.
400
How do you calculate the mass when you are given a value in moles? What if you were asked to go from a given mass to moles?
Mass --> moles: use molar mass Moles --> mass: use molar mass
400
In a problem where you need to determine the empirical formula of a compound, you first find the molecular formula through calculations. What is the last step to get from the molecular formula to the empirical formula?
Divide molecular weight (MW) by the empirical formula mass (EFM). Take this value and multiply everything in the empirical formula by this value to get the molecular formula.
500
Identify the following as physical or chemical changes: Ice melting Leaves changing color Cutting a piece of paper Dissolving sugar in water Milk souring
Ice melting, cutting paper, dissolving sugar: physical Leaves changing, milk souring: chemical
500
A student measures the mass of sample as 28.55 g. Calculate the percent error, if the correct mass is 28.15 g.
1.4%
500
Determine the following for cobalt: Chemical symbol Atomic number Atomic mass Mass number Number of protons Number of neutrons Number of electrons
Co Atomic number: 27 Atomic mass: 58.93 Mass number: 59 Number of protons: 27 Number of neutrons: 32 Number of electrons: 27
500
If you are given a number of atoms and you needed to calculate the mass in grams, how would you do this?
Use Avogadro's number first to get to moles Use molar mass to get from moles to grams
500
A + B --> C How many moles of product C could be formed from the reaction of 10 moles of reactant A and 15 moles of reactant B?
All 1:1, so 10 moles of C could be formed from A, and 15 moles of C could be formed from B. Therefore, A is limiting and only 10 moles of C can be formed.