Exam I
Provide the formula for Barium Sulfate.
BaSO4
This is the balanced version of the following equation:
X (s) + F2 (g) => XF3 (s).
2 X (s) + 3 F2 (g) => 2 XF3 (s)
This is the type of reaction that takes in energy.
Endothermic
How many of the following exhibit London Dispersion forces?
CH3OH, KCl, H2O, Br2, NH3, HCl
6 (all of them)
These are more stable in an ENDOthermic reaction.
Reactants
Adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass.
What is the empirical formula?
C₈H₁₁O₃N
Balance the following equation and name the sum of the coefficients.
__C4H10O + __O2 → __CO2 + __H2O
19
(1, 6, 4, 8)
This is the shape of carbon dioxide.
linear
The types of intermolecular forces that H2O exhibits.
London dispersion forces, hydrogen bonding, dipole-dipole
The most stable form of Magnesium has how many protons and electrons?
12 Protons
10 Electrons
A sample of a gas at STP occupies a volume of 0.501 L at 0.780 atm. This is it's new pressure if the volume increased to 0.794 L
0.492 atm
From the reaction: B2H6 + O2 HBO2 + H2O (unbalanced)
How many moles of water are produced from 19.2 g of B2H6.
1.388 moles H2O
[Xe] 6s2 is the electron configuration of which ground state element?
Barium
This is the empirical formula of C6H12O6.
CH2O
Convert 13.6 g of Bromine gas to moles.
.0851 moles
This is the name of Al2S3.
Aluminum Sulfide
From the reaction: B2H6 + O2 HBO2 + H2O
(unbalanced)
How many moles of O2 are needed to react with 5.76 moles of B2H6.
17.28 moles O2
Arrange the following in order of increasing atomic radius:
Sn, Xe, Rb, Sr
Xe, Sn, Sr, Rb
These are the conditions for STP
273 K (0 C) & 1 atm
How many of the following statements are true?
I. A balanced equation relates the number of moles of reactants and products.
II. To convert between moles of reactants and moles of products, we use mole rations derived from the balanced equation
III. Often, reactants are not mixed in stoichiometric quantities (don't "run out" at the same time. In this case, we must use the limiting reactant to calculate amounts of products formed
IV. When a chemical reaction occurs, it must follow the law of conservation of mass.
4 (all of them are true)
This is the monatomic gas given the following scenario: A 2.5-L container at 1.00 arm and -48 *C with 5.41 grams of gas.
Argon (Ar)
This is how many grams of sodium chloride would lead to create a 4.2 M solution of ions in 250 milliliters of water.
30.681 grams
This is the ranking of the following species in order of IMF strengths:
CH4, He, MgCl2, H2O, HCl
He<CH4<HCl<H2O<MgCl2
This is the name of the manganese oxide that contains 63.2% manganese by mass.
What is manganese (IV) oxide
A member of the alkaline earth metal family whose most stable ion contains 36 electrons forms a compound with Bromine. What is the correct formula of this compound?
SrBr2