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