Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
100
Why do atoms share electrons?
Atoms share electrons so that they can become more stable.
100
In a chemical equation, what side of the arrow are the products located on?
The products of a chemical equation are located on the right side of the arrow.
100
What is the molar mass of Cu?
The molar mass of Cu is 63.546 g/mol
100
How many moles of CO2 are produced when 10.0 mol of C3H8 are burned? Chemical equation: C3H8 + O2 YIELDS CO2 + H20
30.0 mol CO2
100
What is the SI unit for pressure?
Pa, pascal
200
When is a molecule formed?
A molecule is formed when two or more atoms bond together (covalently).
200
The arrow in a chemical equation is read as what?
The arrow in a chemical equation is read as "yields" or "reacts to produce"
200
What is the rounded number for Avogadro's number that we use in chemistry?
We use 6.02 X 10^23
200
Zn reacts with 2HCl to produce ZnCl2 and H2. If 25.0 g are in the sample, determine the theoretical yield. Calculate the percent yield if the reaction yields 0.680 g H2. Chemical equation: Zn + 2HCl YIELDS ZnCl2 + H2
theoretical yield= 0.771 g H2 % yield= 88.2 % H2
200
When electron clouds of different atoms come close to each other, what do the electrons tend to do?
Electrons will repel each other.
300
When is the bond between atoms the strongest?
The bone between atoms is the strongest when the bond length is shorter.
300
What are spectator ions?
Spectator ions are ions or compounds that do not participate in the chemical reaction. Spectator ions remain the same after the reaction has occurred.
300
How many atoms are in 0.625 moles of Ge?
3.76 x 10^23 atoms
300
Determine the mass of NaCL produced when 1.25 mol of Cl2 reacts with excess sodium. Chemical equation= Na + Cl2 YIELDS NaCL
146 g NaCl
300
What is a polar covalent bond?
A polar covalent bond is when electrons are not shared equally between atoms.
400
Draw the molecule PH3 using Lewis dot structure.
Lewis dot structure of PH3
400
Balance the following chemical equation: H2SO4 + B(OH)3 YIELDS B2(SO4)3 + H2O
Balanced chemical equation
400
A compound is found to have the following % composition: 68.4% Cr and 31.6% O. What is the empirical formula?
Cr2O3
400
If you start with 10.0 g of LiOH, how many grams of LiBr will be produced? Chemical Equation= LiOH + Her YIELDS LiBr + H2O
36.3 g LiBr
400
When are dispersion forces caused?
Dispersion forces are caused when electron clouds have a temporary shift in electrons that cause the electron clouds to have not as dense of a region of electrons. This causes a weak bond.
500
NAME the molecule S2Br4
Disulfur tetrabromide
500
The chemical reaction that has the formation AX + BY AY + BX is what type of reaction?
This type of reaction is a double replacement reaction.
500
The molar mass of nicotine is 162.1 g/mol. It contains 74.0 % Carbon, 8.7% Hydrogen and 17.3% Nitrogen. Determine the empirical AND molecular formula.
Empirical formula= C5H7N Molecular formula = C10H14N2
500
The reaction between P4 and O2 produces P4O10. What is the mass of P4O10 formed if 25.0 g of P4 and 50.0 g of O2 are combined. Determine the mass of the excess reactant.
Mass of P4O10= 57.3 g Mass of excess reactant= 17.7 g O2
500
Describe the GENERAL behavior of gases. (think particle size, and movement)
Gas particles are small and far apart. They move randomly and do not change direction until they hit other matter or particles.
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