Chemistry Final 109

What is the principle quantum number?

(n)

What is the oxidation numbers for K, Cr, and O in the equation K₂Cr₂O₇.

+1; +6; -2

What is the charge of the cobalt ion in CoO₂?

+4

Calculate the ∆E of the electron of a hydrogen atom as the electron drops from the n=5 state to the n=3 state.

-1.55x10⁻¹⁹J

What is the energy of an electron in Hydrogen?

-Rh(1/n²)

What is the formula for a hydrogen atom who changes n levels?

-Rh(1/n²f)-(1/n²i)

Convert 2.9x10⁻² to standard notation.

.029

How many moles of Nickel are in 2.5g of Nickel?

.043 moles

Suppose we have 200 mL of lead nitrate, Pb(NO₃)₂(aq). A solution a NaCl (aq) is added slowly until no further precipitation occurs. The precipitation is collected by filtration, dried and weighed. A total of 12.5g of PbCl₂(s) is obtained. Calculate the molarity. Equation: 2NaCl(aq)+Pb(NO₃)₂(aq)→PbCl₂(s)+2NaNO₃(aq)

.224M

2C₂H₆+7O₂→4CO₂+6H₂O How many moles of carbon dioxide is produce if .25 moles of C₂H₆ reacts with excess oxygen?

.50 moles

What is the l and m of n=1?

0 (s) 0

What is the l and m of n=2?

0 (s) ; 1 (p); -1,0,1

What is the l and m of n=3?

0(s); 1(p); 2(d) : -2,-1,0,1,2

What is the l and m of n=4?

0(s); 1(p); 2(d); 3(f) -3,-2,-1,0,1,2,3

How many grams of solute are contained in 25.0 mL of a 1.20 M HCl solution?

1.09 g HCl

Calculate the total number of atoms in 4.0 moles of CH₄

1.2x10²⁵ atoms

What is 169458g in 2 sig figs?

1.7x10⁵g

What is the de Broglie wavelength (in nm) associated with 2.5g ping pong ball traveling at 15.6 m/s?

1.7x10⁻²³

For this reaction: 2NaI+Cl₂→2NaCl+I₂ How many grams of NaCl is obtained if 5.0 grams of NaI reacts with 5.0 grams of Cl₂?

1.95g

What is Kilos meaning?

10³

If an aqueous solution is 125 ppm F-, there are 125 grams of F- for every ___ of solution.

10⁶ g

What is millis meaning?

10⁻³

Calculate the wavelength (in nm) of a photon emitted by a hydrogen atom when its electron drops from the n=5 state to the n=3 state.

1280nm

Mercury is a liquid metal at room temperature. A 25.0 g sample of mercury has a volume of 1.84 mL. What is the density?

13.6

What is the mass, in kg, of 3.75x10²⁶ atoms of aluminum?

16.8 kg

Balance this equation: ___C₆H₁₂O₆(s)+_____O₂(g)→→→______CO₂(g)+________H₂O(l).

1:6:6:6

How many sig figs are in .0010?

2

What is the charge of Mg?

2+

Calculate the molality of of a solution made by dissolving 115 grams of NaNO₃ in 500 mL of water. The molar mass of NaNO₃ is 85 g/mol and density of water is 1 g/ml.

2.70

Calculate the percent by mass of an aqueous solution that is 2.5 m KNO₃. The molar mass of KNO₃ is 140.1g/mol.

26%

Which equation correctly describes the reaction: sodium reacts with chlorine to produce sodium chloride?

2Na+Cl₂→2NaCl

How many sig figs are in 10.0 mL?

3

What is the charge of N?

3-

What volume of .75 M NaOH is required to produce 150 mL of .15 M NaOH?

30 mL

Calculate the percent composition of carbon in ethanol, C₂H₆O.

52.1

Borax is 11.3% boron by mass. How many grams of boron are in 5 kg of borax?

565 g Borax

What is the frequency of blue light with a wavelength of 450 nm?

6.67x10¹⁴

For this reaction : 2C₂H₆+7O₂→4CO₂+6H₂O How many grams of water are produced when .25 moles of CO₂ forms?

6.8g

Convert 65 g/ml to to kg/l

65 kg/l

The molar mass of (NH₄)₂S is how many grams?

68.15g

Convert 8.05 x 10⁵cm to km

8.05

For the reaction 2S(s)+3O₂(g)→2SO₃(s) 2 moles of sulfur are places in a container with an excess of oxygen and 1.7 moles of SO₃ are collecteed. What is the percentage yield?

85%

What is the oxidizing agent in: Cu(s) + 2AgNO₃(aq)→2Ag(s)+Cu(NO₃)₂(aq)

AgNO₃(aq)

What element is oxidized in Al+Fe₂O₃→Al₂O₃+Fe?

Al

What is Phosphorus's atomic number, proton #, and electron #?

All 15

What is the formula for cobalt(II) sulfide?

CoS

Is phosphorus and sulfur ionic and covalent?

Covalent

What is the name and charge of CN?

Cyanide and -

What is the energy formula?

E=hv

Exothermic or Endothermic: 2Mg(s)+O₂(g) with - kJ/mol

Exothermic

Exothermic or Endothermic: Water placed in the freezer turns to ice.

Exothermic

True or False: Boron is a metal in the second period.

False

True or False: For an endothermic reaction, the energy of the reactants is greater than the energy of the product.

False

True or False: For an exothermic reaction, the energy of the products is greater than the energy of the reactants.

False

True or False: Sodium is an alkaline earth metal

False

What is the chemical formula for the precipitate that will form when FeCl₃(aq) reacts with K₂S(aq)?

Fe₂S₃

What are three strong acids?

HBr; sulfuric acid; HClO₄

What is the formula for Hydrofluoric Acid?

HF

Is Iron and Fluoride ionic or covalent?

Ionic

If a compound contains both ionic bonds and covalent bonds, it is classified as an

Ionic compound

What is the name of FeSO₄?

Iron(II) Sulfate

What is the formula of the compound formed between the most common ions of lithium and nitrogen?

Li₃N

A compound containing only Molybdenum and Oxygen is found to contain 75% Mo, by mass, Determine the empirical formula.

MoO₂

An unknown compound was determined to have an empirical formula of MX and a molecular mass that is twice the value of the empirical formula mass. The molecular formula is

M₂X₂

Is MgCl₂ a covalent bond?

No

Is NH₄Cl a covalent bond?

No

Is coffee a pure substance?

No

What is the name of PBr₃?

Phosphorus Tribromide

Gold is melted to cast into a ring. Is this a physical or chemical change?

Physical

What type of reaction is this: Pb(NO₃)₂(aq)+2KBr(aq)→PbI₂(s)+2KNO₃(aq)

Precipitation

What is the name and charge of SO₃?

Sulfite and 2-

True or False: Bromine is a halogen in the fourth period.

True

True or False: For an endothermic reaction, the energy of the products is greater than the energy of the reactants.

True

True or False: For an exothermic reaction, the energy of the reactants is greater than the energy of the products.

True

True or False: Iron is a transition metal.

True

True or False: The mass number of an isotope cannot be determined by looking at the periodic table.

True

Is Lithium a pure substance?

Yes

Is NO₂ a covalent bond?

Yes

A precipitation reaction forms...

a solid from solution

The energy of a photon is what to the change of e

absolute value

What type of reaction is this: HCI(aq)+NaOH(aq)→NaCl(aq)+H₂O(g)

acid base

An __ is a substance that produces H⁺ ions in aqueous solution. NaOH is an example of a ______. In a neutralization reaction, acid + ______→_____+ water

acid; base; base; salt

All e⁻'s with the same n, l, m are all?

are in the same orbital

Gasoline burns to power a car. Is this a physical or chemical change?

chemical

What type of energy is a potential energy?

chemical energy

Is Oxygen and Oxygen ionic or covalent?

covalent

l(2)=

d

What does the principle quantum number (n) mean?

defines the relative average distance from the nucleus and the energy of the e⁻

An ionic compound is an ___________. When it dissolves in water, it ________.

electrolyte; breaks apart into ions

____is the capacity to do work

energy

Exothermic or Endothermic: The reaction of natural gas with oxygen is used in a stove top to heat up a can of soup

exothermic

Is mass an extensive or intensive property?

extensive

l(3)=

f

l(4)=

g

The what state has no definite shape nor definite volume?

gas

The what state is very compressible?

gas

What does the magnetic quantum number tell us?

gives the orientation in space of the orbital

wavelength =

h/(mass)(velocity)

Is density an extensive or intensive property?

intensive

What are two units of energy?

joules and calorie

____energy is the energy of an object in motion

kinetic

What is angular momentum quantum number?

l

What is the magnetic quantum number?

m(l)

l=

n-1

Is 4,3,2 an allowable set for 4p subshell?

no

Is Ba(OH)₂ insoluble in water?

no

Is Fe(NO₃)₃ insoluble in water?

no

Is Na₂S insoluble?

no

Is ocean water a pure substance?

no

l(1)=

p

Liquid nitrogen converts to nitrogen gas, is this a physical or chemical change?

physical

A cation has a _______ charge. It is formed by the ______ of _______.

positive; loss; electrons

______ energy is the energy stored by virtue of an objects position or state.

potential

Heat change measured at constant _____ provides the enthalpy change. If the surroundings decreases in temperature during the course of the reaction, the reaction is _____.

pressure; endothermic

All electrons with the same n value are in the same ?

principal shell

Rank the four regions of the electromagnetic spectrum from least energy to greatest energy : radio waves, x rays, blue light, and red light

radio waves; red; blue; x rays

What type of reaction is this: 2CO(g)+O₂(g)→2CO₂(g)

redox

What type of reaction is this: 2FeCl₂(s)+Cl₂(g)→2FeCl₃(s)

redox

l(0)=

s

In the shell n=4, what are the names of the subshells it has?

s,p,d and f

What does the angular momentum show?

shape of the orbital

What is does the phase mean?

sign of the amplitude of a wave

In the what state, the molecules are close together in a fixed location relative to one another?

solid

A ________ is a homogeneous mixture made of a _____ and a ______.

solution; solute; solvent

A mole is defined by

the number of atoms in 12 grams of ¹²C

c=?

wavelength times frequency

Is 1, 1, -1 an allowable set for a 4p subshell?

yes

Is 4,1,0 an allowable set for a 4p subshell?

yes

Is AgI insoluble?

yes

Is CaCO₃ insoluble in water?

yes

Is H₂O a covalent bond?

yes

Is table salt (NaCl) a pure substance?

yes

Is this an allowable set of quantum numbers: 1,0,0

yes

Is this an allowable set of quantum numbers: 2, 1, -1

yes

Is this an allowable set of quantum numbers: 3, 2, 0

yes

Is this an allowable set of quantum numbers: 4, 1, -2

yes

Heisenberg's Uncertainty Principle is?

∆x∙m∆v>h/4(pie)