Chemistry Final
What is the correct Lewis structure for 02 ?
0=0
The correct multiplier for the prefix micro:
10-6
Determine the answer to the following equation with correct number of significant figures: 106/9.02xl=
22
Given the balanced equation CH4 + 2 O2 → CO2 + 2 H2O, which of the following is NOT a correct conversion factor?
2mole H20=18.02 g
How many grams of water are made from the reaction of 4.0 g of hydrogen gas? Given the reaction :2H2 +02=2H20
36
Considering the following precipitation reaction: Pb(NO30)2Kl(aq) which ion would NOT be present in the complete ionic equation?
All these ions are in the complete ionic equation
Which of the following is considered a hypothesis ( as opposed to an observation ) ?
Birds can fly because the have hollow bones
A chemical bond is classified as a covalent bond I'd it involves the transfers of electrons
False
A correct Lewis structure for an atom of carbon would have eight dots surrounding the symbol of the element
False
A principle shell with a value of N=3 would contain s,p,d, and f orbit
False
Based on relative location on the periodic table , a carbon atom is larger in atomic size than phosphorous atom.
False
JJ Thomas discovered the existence of protons
False
Protons and elections each have a mass of 1 amu
False
Suppose a symmetrical metal rod of the element lead has a density of 11.4 g/cm3. If this rod is cut in half, the density of each piece is now 5.7 g/cm3.
False
The VSEPR theory predicts the the H-C- H handle in CH4 measures 120o
False
The prefix micro represents the multiplier 0.0001
False
main group elements tend to form ions that have he same number of total electrons as the nearest halogen
False
A compound composed of only hydrogen and oxygen is 5.94% hydrogen mass . The molar mass of this compound is 34.02. G/mol. What is the compound is 34.03 g/mol what is the compounds molecular formula ?
H202
What is the correct formula for potassium dichromate
K2Cr207
What would the formula of the precipitation that forms when Pb(NO3)2(aq)and K2SO4(aq)are mixed?
PbSO4
What is the correct name for the BrO41 -ion
Perbromate
Which of the following compounds is soluble?
Potassium carbonate
A compound had a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio. The name of the compound described here is
Sodium oxide
A solution map diagrams the steps required to get from the starting point to the end point of a calculation problem.
True
Flammability of gasoline is a chemical property.
True
In the modern periodical table, elements are listed in order of increasing atomic number rather than increasing relative mass.
True
One mole of lead(II) nitrate contains six moles of oxygen atoms.
True
The Lewis theory predicts that the formula for a compound made of sodium and fluoride is NaF
True
The decimal number 0.0210 expresses in scientific notation is 2.10 x 10-2
True
When compounds containing polyatomic ions dissolved , the polyatomic ions usually dissolve as intact units
True