Unit 1: Name these.
Explain the difference between mass and weight.
What is:(to an extent)
Weight is a physical property that is dependent upon a planet, while mass is a constant that is a standard unit.
In a balanced equation, this allows conversion from moles of one substance to another.
What is a mole ratio?
This constant is known as Avogadro's number.
What is 6.022 x 10^23?
A student gets a 91% percent yield for 100g. How many grams were produced?
What is 91 grams?
45 seconds: convert kilograms to milligrams
What is 1 million? (Multiplier: x3)
Name all five types of Chemistry.
What is:
Biochemistry, Organic Chemistry, Inorganic Chemistry, Analytical Chemistry, & Physical Chemistry.
This conversion factor, expressed in grams per mole, is required to convert mass and amount of substance.
What is molar mass?
Multiplier x2
The measurement 0.00450g contains this number of significant figures.
What is 3?
Round 45.678 to 3 sig figs.
What is 45.7?
30 seconds: How many sig figs are necessary for this question?
10.0-7.238
What is 2.76?
Indications of a Chemical Reaction Include: (Find 3)
Rust, Color change, odor change, temperature change, formation of a gas or solid, and energy
(Multiplier x3)
In the reaction 2H2 + O2 → 2H2O, 4.0 mol of H2 reacts with 1.0 mol of O2. Identify the limiting reactant.
What is oxygen, O2?
Explain the fundamental difference between accuracy & precision.
What is (along these lines): (Multiplier x2)
Accuracy: can be inconsistent, yet fulfills its purpose
Precision: consistent upon a single point, does not indicate correctness.
Solve for density if mass= 36g and volume = 12mL
What is 3g/mL?
25 seconds:
The density of mass is 72g, and the volume is 2.5 mL
Multiplier x2
What is 28.8 g/mL?
Name all five proper scientific method steps IN ORDER
What is:
In order: Observation, Hypothesis, Experimentation, Theory, & Law.
In a titration, 25.0 mL of HCl is completely neutralized by 30.0 mL of 0.150 M NaOH. Determine the molarity of the HCl.
What is 0.180 M HCl?
If a measurement is reproducible, but consistently far from the accepted value, it has this combination of qualities.
What is high precision but low accuracy?
In the equation 2H2+O2 -> 2H2O, determining the mole ratio of oxygen gas to water.
What is 1:2?
10 seconds:
Nick T, despite following all proper procedures, has gotten 6.1 grams of salt instead of 7.2. What is the percent error?
What is 15.3%?
This quantitative branch of chemistry relates reactant and product amounts utilizing balanced chemical equations.
What is stoichiometry?
A 24.0 g sample of methane burns completely in excess oxygen according to the equation CH4 + 2O2 → CO2 + 2H2O. Determine the mass of carbon dioxide produced.
What is 66.0 g of CO2?
Convert 18.01% to decimal form.
What is 0.1801?
A compound contains 0.25 mol of molecules. How many molecules are present?
What is 1.5 x 10^23 molecules?
5 seconds:
What is 63 grams of H20 in moles?
What is 3.5 moles?
Multiplier (x2)