Chemistry Final Exam
determine the oxidation number of the element that is underlined within the compound BaCrO₄
+6
Convert 32K to degrees C
-241
How many moles are present in 16.9g of Al₂O₃
0.166 mol
Two hundred forty-eight milliliters of an acid with an unknown concentration are titrated with a base that has a concentration of 1.4 M. The indicator changed color when 82 milliliters of base were added what is the concentration of the unknown acid
0.46M
given the following balanced reaction of hydrogen peroxide decomposing to form oxygen gas and water, how many moles of oxygen gas, O₂, are produced from 0.980 moles of hydrogen peroxide? 2H₂O₂₍₁₎⇢O₂₍ᵍ₎+2H₂O₍₁₎
0.490 mol
A student collects 285 mL of O₂ gas at a temperature of 15ºC and a pressure of 0.983 atm. the next day, the same sample occupies 292 mL at a temperature of 11ºC. What is the new pressure of the gas? Combined gas law - P₁V₁/T₁ =P₂V₂/T₂ * Change the Temp to Kelvin first
0.946 atm
Calculate the number of molecules present in 2.25 mol H₂SO₄
1.35 x 10²⁴
students asked to measure the temperature of a reaction blacker recorded the following temperatures. 103.7, 108.4, 105.8, 104.6. The actual temperature is 105.1. Which measurement is the most precise
104.6
if a sample of copper with a density of 8.9 g/cm³ displaces 13.0 mL of water when placed in a beaker, what is its mass?
116 g
what would be the formula for an alkane that contains 26 hydrogen atoms C______H₂₆
12
if a chemist wants to make 575 milliliters of 0.75 M HCI solution from a stock solution of 2.0 M HCI, how many. milliliters of the stock solution would the chemist need to use?
220mL
what is the molecular weight (mass) for Ba(NaO₃)₂?
261.34g/mol
Determine the mass of the object below to the correct degree of precision
265.8g
How many significant figures are in 136,000 mL
3
elements in group 15 will gain electrons to obtain a noble gas structure. How many electrons will the element gain or lose in order to obtain a noble gas structure
3
which of the following is not equal to .325 cg
3.25x10⁵
A chemist needs 1.36 mol of strontium bromide, SrBr₂, for a reaction. What mass of strontium chloride should the chemist use?
337g
A cube has dimensions of 5.5 cm, 3.0cm, and 2.0cm. What is its volume
33cm³
express the following number in scientific notation 46,000,000
4.6 x 10⁷
what is the volume of the fluid in the graduated cylinder measured to the correct degree of precision
43.4ml
pikes peak is 4,301 meters high. How many centimeters high is the mountain
430,100 cm
the element in group 15 all have ________ valance electrons
5
how many valence electrons are represented in the following electron configuration? 1s²2s²2p⁶3s²3p⁴
6
Express it in scientific notation and include the correct number of significant figures. (12x10⁴) x (5 x 10⁻²)=
6 x 10³
find the density of an object that has a mass of 66 g and a volume of 10cm³
6.6g/cm³
What is the molar mass of carbonic acid, H₂CO₃
62.01g
How is the number 7.89 x 10³ expressed in regular numerals?
7,890
what is the chemical formula for a compound between Al and F
AlF₃
the formula P₁V₁=P₂V₂ applies to _________
Boyle's law
predict which atom has the higher ionization energ
Cl
A house is built Spontneous or not spontanesou
Not spontaneous
Hans Geiger, along with _____________, used a scintillation counter ( later known as the Geiger counter) to measure radioactivity
Rutherford
An ___________ is a hydrocarbon in which one of more hydrogen atoms is replaced by a -COH group
aldehyde
which group of elements contain the most reactive metals
alkali metals
which of the following is not a property of gases?
all gases are diatomic
which of the following characteristics is the kinetic molecular theory based on
all matter is in continual random motion
which of the following is a chemical change
an ice pack is shaken and squeezed and becomes cold
Pure ammonia (NH₃) is an example of a(n) ______________
compound
The diameter of a large pizza
decimeter
A chemist places a flask containing the reactants in an ice bath. This will _________ the rate of reaction.
decrease
Tastes and odors that are naturally found in fruits or are used in candies, flavorings, and perfumes are often the result of ________-
esters
in the formation of table salt, the product NaCl, has less energy than the reactants, NA and Cl₂. This is a ______________ reation
exothermic
what type of nuclear reaction produces a nucleus with a larger nuclei of lower masses
fusion
Straight chain hydrocarbon with the formula C₅H₈
has a C-C bond
Gases and plasma
have no shape and no definite volume
choose the answer that best describes what kind of substance air is
homogeneous mixture
choose the answer theat best describes what kind of substance ocean water is
homogeneous mixture
According to the electronegativity difference, what type of bond are potassium and chlorine most likely to form
ionic
In an endothermic reaction, energy
is absorbed by the reaction
that element is missing in the following nuclear equation 212/84 Po⇢208/82?+4/2He
lead
the following are units for mass except
mL
what type of solid conducts electricity
metallic
A student takes three beakers and places 250 milliliters of water in each. The student then adds a cube of sugar to all three beakers. the first beakers is stirred, the second beaker is heated, and the third beaker is left alone. Which dissolves faster?
not enough information
The following statement is a(n) There is a significant difference between how elderly people and young people feel about politics
opinion
Which elements in the following groups are most likely to not show similar properties
oxygen, bromine, calcium
freezing, boiling, and evaporation are all examples of
physical change
moisture in the air forms beads of water on a cold window pane
physical change
terarium Melts at 725ºC
physical property
J.J. Thompson experimented with cthoe rays and how they traveled through various gases. Through his experiments, he discovered electrons. His atomic model was known as the __________________
plum pudding model
Choose the element described by the following electron configuration 1s²2s²2p⁶3s²3p⁶4s¹
potassium
Identify whether the following example is qualitative or quantitative data: The length of a road
quantitative
according to the hardness scale, quartz is __________ than diamond 10 diamond 9 corundum 8 topaz 7 quartz 6 feldspar
softer
A(n) ___________ is a homogenous mixture in which the solute is completely dissolved in the solvent
solution
The scientific method is a step by step process that attempts to ______________ a problem
solve
the scientific method is a step-by-step process that attempts to __________________ a problem
solve
Which of the following results from Rutherford's gold foil experiment was evidence that the proton was part of the atom's nucleus
some of the alpha particles bounced straight back off the foil and stuck to the front side of the film
Lye works to dissolve oil and grease because it is a _______________
strong base
which of the following is a correct representation of the isotope of sulfur that has 19 neutrons?
sulfur-35
Other than carbon being relatively small, what is another reason that carbon can form so many compounds?
the ability to form ring structures and chains
An ideal gas is a _________________ gas
theoretical
radioactivity is the process of nuclear decay
true
is the following chemical equation balanced? 4Al + 3O₂⇢2Al₂O₃
yes/no
