Grab Bag
A mystery element has 3 dots in its lewis structure. What could be its atomic number? 19, 31, 51, 85?
31
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
What reaction type is this?
Combustion
Electrons are shared in what kind of bonds?
Covalent
2 parts: Whose model of the atom is includes a dense, positive nucleus and electrons floating around in set orbits? AND what charge is the electron?
Bohr's model and negative one
Using the following equation, figure out how many moles of water would be produced if the reaction began with 20 moles of oxygen:
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
17.14 moles H2O
Which bond is the strongest? single, double, triple? How may electrons are in this bond?
Triple, 6
Balance the equation and answer in molar ratio form...1:1:1
__ Al + _O2 →___ Al2O3
4:3:2
What charge (number and sign) does phosphorous have when ionized?
-3
2 parts: What did the gold foil experiment discover? AND how many valence electrons does silicon (Si) have?
The nucleus is dense and positively charged and the atoms is mostly empty space. Also, Si has 4 electrons.
If you have 10 grams of C2H6 gas left to burn, how many moles do you have?
Increasing temperature, stirring and surface area affects...
the number of collisions in a solution.
What method of separation would be best to separate two liquids of different boiling points?
Distillation
Name the following molecule: CaCl2
Calcium Chloride
2 parts: What did Thomson discover? How many electrons are located in the 2p orbital?
The electron AND 6 electrons
The head of a match has 1.6 grams of sulfur. How many atoms of sulfur do you have?
3.011 x 1022 atoms
What is the VSEPR shape AND polarity of PH3?
Trigonal pyramidal and Polar
What is the molarity of a solution containing 72.06 grams of BaCl2 in enough water to make 0.800 L of solution?
0.43 M
Write the formula for the following molecule: P2O5
Diphosphorous pentoxide
2 parts: Democritus described the atom as something that cannot be broken down using what word? AND What element is this: [Xe] 6s24f145d106p1?
Indivisible (or indestructible) AND Thallium (Tl)
The chemist begins with 46 grams of Na. How many grams of Cl2 are needed? 2 Na + Cl2 → 2 NaCl
70.93 g
HCl has what intermolecular forces?
London dispersion forces and dipole-dipole
Which of the following will NOT dissolve in water?
Sugar, Salt, or Oil?
Oil
Write the chemical formula for Nickel (III) sulfide.
Ni2S3
Which of the following atoms has 3 valence electrons and 4 electron shells/levels? AND is it more or less electronegative than Br?
Gallium AND Less
If you react 30.00 g of magnesium with 60.00 g of hydrochloric acid (HCl), what is the limiting reactant?Mg + 2HCl → MgCl2 + H2
HCl is the limiting reactant.