FINAL-chem

how many molecules of methane (CH4) are there in 1 mole of methane

6.02 x 10^23 molecules

if 63.5 g of Cu combines with 16g of O to form CuO, how many grams of O would be needed to combine the same about of Cu (63.5) to form the compound Cu2O

8 g

an element that is a shiny solid and a good conductor of heat and electricity could have an atomic number of

12

which substance contains metallic bonds? C6H12O6(s), H2O(l), NaCl(s), Hg(l)

Hg

Ni(No2)2

nickel (II) nitrite

in rutherfords experiemnts, he found that almost all of the particles shot at he foil

passes thru

rutherford gold experiment indicates fhag

positive charges are concentrated in a very small core at the atoms center

SiCl4

silicon tetrachloride

Na2O

sodium oxide

NaMnO4

sodium permanganate

experiments with the cathode ray tube demonstrated thaf

the beam consists of charges particles

protons and neutrons scattered

thomson

what conversion factor should be used to convert from mass of a substance in grams to the number of moles of the substance

1 mol/number of grams in molar mass

what is the molecular mass of nicotine, C10H14N2

162.23 g

how many sulfur atoms are there in 21.0 g of Al2S3

2.53 x 10^23 atoms

how many C atoms are in 5.50 g of C

2.76 x 10^23 atoms

what is the mass of 3.50 x 10^24 Ti atoms

278 g

how many miles of nitrogen gas (N2) are there in 84.0 g

3.00 moles

which of the following CO2 samples contains the greatest number of moles of CO2

3.5 moles

if 6 g if X reacts with 17 g of Y, how many grams of X will combine with 85 g of Y

30 g

what is the mas of 0.55 mile of C6H6

42.96 g

what is the molecular mass of carbon dioxide (CO2)

44 g/mol

what is the mass of one mole of iron

55.85 g

calculate the % by mass of C in C2H4

85.7%

calculate the % by mass of N in N2H4

87.5%

aluminum sulfate

Al2(SO4)3

boron trichloride

BCl₃

the mole ratio of barium to carbon to oxygen in a compound is 1 mol Ba : 1 mol C : 3 mol 0. what is the empirical formulae for this compound?

BaCO3

Tribromine octoxide

Br3O8

a compound with an empirical formula of C2H2Br3 has a molar mass of 531.47 g/mol. what is the molecular formula

C4H4Br6

An unknown compound with a molar mass of 223.94 g/mol consists of 32.18% C, 4.50% H, and 63.32% Cl. find the molecular formula for the compound

C6H10Cl4

which compound will have the higher melting point? CaS or KCl

CaS

Chromium (III) nitrate

Cr(NO3)3

Chromium (II) bromide

CrBr2

cesium bromide

CsBr

Copper (II) sulfide

CuS

two charges qA and qB are separated by a distances r and exert a force F on each other. what new force will exist if qA is doubles and r is doubled

F/2

what new force will exist if r is tripled

F/9

iron (II) chlorite

Fe(ClO2)2

Iron (II) Hydroxide

Fe(OH)2

which of the following can conduct an electric current? (aq means dissolved in water). NaOH(s), Cl2(g), H2O(s), HCl(aq)

HCl

potassium oxide

K₂O

lithium bromide

LiBr

magnesium nitride

Mg₃N₂

the mineral pyrolusite is a compound of ^55Mn and ^16O. if 63% of the mall is pyrolusite is due the manganese, what is the empirical formulae of pyrolusite?

MnO2

if the empirical formula for a compound if NO2 and the molar mass of the actual compound is 92 g/mol, what is the molecular formula for the compound?

N2O4

which of the following solids has the highest melting point? H2O, CO2, I2, Na2O

Na2O

Nickel (II) nitrate

Ni(NO3)2

Lead (II) sulfide

PbS

lead (II) sulfide

PbS

NaOH

Sodium Hydroxide

strontium acetate

Sr(CH3COO)2

Sn3P2

Tin (II) Phosphide

since any metal or gas used in the cathode ray tube produced electrons it was concluded that

all atoms contain electrons

daltons atomic theory did not include the concept thaf

atoms contain electrons, protons, and neutrons

lots of diagonal rings

bohr

the atomic model with nuetrons and protons is the middle with a ring with two electrons

bohr

CaI2

calcium iodide

copper is a red-brown metal and copper chloride is a blue powder. which of the following statements is true?

copper metal contains atoms but copper chloride contains ions which have different properties than atoms

the circle atomic model was developed bg

dalton

N2Br4

dinitrogen tetrabromide

you have determined that a compound is composed of 0.300 moles of carbon and 0.600 moles of oxygen. what must you do next to determine the ratio of the elements in the empirical formula of the compound

divide each by 0.300 mol

which part of the atom is most likely to be transferred as a body quoted an electric charge

electron

when a plastic rod is rubbed with wool, the wool squires a positive charge because

electrons are transferred from the wool to the rod

after two neutral solids, A and B, were rubbed together, solid A squired a negative charge, Solid B, therefore

experienced a loss of electrons

positively charged objects have become positive by gaining positive charge from other atoms

false

sodium chloride (table salt) doesn't conduct electricity when it is solid, but does when it is molten or dissolved in water because

in the solid the ions can't move past each other but they can when the table salt is melted or dissolved in water

which of the following bonds/forces is the weakest? covalent, ionic, metallic, intermolecular

intermolecular

one mole of iron

is NOT 26.0 g of iron, is 77.0 g of iron, weighs the same as one mile of lead, is heavier than one mole of lead

an element is a good conductor of heat and electricity because

it has mobile electrons

oxygen can combine with carbon to form two compounds, carbon monoxide and carbon dioxide. the masses of oxygen that combine with a given amount of carbon have a ratio of 3:4 and 3:8. this is an example of

law of multiple proportions

MgBr2

magnesium bromide

MgO

magnesium oxide