HESI A2 Chemistry
How many d orbitals are there in a d subshell?
5
After balancing the following reaction, what is the coefficient of the molecule of water? C6H12O6+O2>CO2+H2O
6
When two atoms are triple bonded to each other, how many electrons do they share?
6
What is one mole equal to?
6.02 x 10^23 untis
Which of the following orbitals is the last to fill? 1s 3s 4p 6s
6s
How many valence electrons do the noble gases contain in their valence shelf?
8
What is most likely the pH of a solution containing many hydrogen ions (OH-) and few hydrogen ions (H+)?
9
What is the oxidation number of hydrogen in CaH2?
-1
Decreasing a liquid pH from 5 to 4 will increase the hydrogen ion concentration by a factor of:
10
The concentration of hydrogen ions in a neutral solution is:
10^-7
What is the mass (in grams) of 7.35 mol water?
132g
What is 119 K in degrees Celsius?
154 degrees Celcius
A sample of O2 gas is heated from 35 degrees celcius to 100 degrees celcius. The final pressure of the gas is 2.5 atm. What was the initial pressure of the gas if the volume of the container remained constant through the heating process?
2.1 atm
What is the mass (in grams) of 0.350 mol copper?
22.2 g
A patient has a temperature of 99.1 degrees fahrenheit. What is the temperature in Kelvin?
310 Kelvin
What is the mass (in grams) of 1.0 mol oxygen gas?
32g
Nora makes soup by adding some spices to a pot of boiling water and stirring the spices until completely dissolved. Next, she adds several chopped vegetables. What is the solute in her mixture?
Spices
Which of the following is not an example of a monosaccharide? Glucose Fructose Sucrose Mannose
Sucrose
According to Charles' Law:
Temperature and volume are directly related
What is the difference between an Arrhenius base and a Bronsted-Lowery base?
The Arrhenius base releases hydroxide ions, and the Bronsted-Lowery base accepts hydrogen ions
An atom with an electron charge is called a(n);
Ion
Which of the following is exchanged between two or more atoms that undergo ionic bonding? Neutrons Transitory electrons Valence electrons Electrical charges
Valence electrons
Which of the following is a vector quantity? Distance Speed Velocity Time
Velocity
What type of organic reaction occurs when water is released as two functional groups bond together?
Condensation
What process transfers thermal energy through matter directly from particle to particle?
Conduction
What is the release of a massive amount of energy caused by the bombarding and splitting of a nucleus by a neutron called?
Nuclear fission
Which of the following does not exist as a diatomic molelcule? Boron Flourine Oxygen Nitrogen
Boron
Which of the answer choices provided best defines the following statement: For a given mass and constant temperature, an inverse relationship exists between the volume ad pressure of a gas? Ideal Gas Law Boyle's Law Charles' Law Stefan-Boltzmann Law
Boyle's Law
What law describes the electric force between two charged particles?
Coulomb's Law
Which of the following could be an empirical formula? C4H8 C2H5 CH C3H6
CH
Which of the following elements is not involved in many hydrogen bonds? Fluorine Carbon Oxygen Nitrogen
Carbon
Increasing the volume of a gas will:
Decrease the pressure of the gas
What is the name for the number of protons in an atom?
Atomic number
Alcohols have which common structure?
A hydroxyl group
What will be adding an acid to a base will yield?
A salt
What is the correct molecular formula for aluminum hydroxide?
Al(OH)3
What type of substance has some properties of a metal, but is made up of a mixture of different elements?
Alloy
Which material has the smallest specific heat?
Aluminum
The rate of a chemical reaction depends on all of the following except: Temperature Surface area Presence of catalysts Amount of mass lost
Amount of mass lost
A covalent bond occurs when:
An electron pair is shared between two atoms, creating the bond
As you move from left to right across the periodic table, which of the following is true? Atomic radius increases Electronegativity increases Ionization energy decreases Electron affinity decreases
Electronegativity increases
What is the name for substances that cannot be broken down into simpler types of matter?
Elements
According to the second law of thermodynamics:
Entropy is always increasing in the universe
What is the name of the state in which forward and reverse chemical reactions are occuring at the same rate?
Equilibrium
Which of the following is an example of a colligative property? Boiling point depression Freezing point elevation Freezing point depression Elevation of vapor pressure
Freezing point depression
Which kind of radiation has no changes?
Gamma
Which of the following substances allows for the fastest diffusion? Gas Liquid Solid Plasma
Gas
Which of the following gases effuses the fastest? Cl2 O2 N2 H2
H2
Which of the following is released during a combustion reaction? Water Heat Oxygen Electrons
Heat
What is another name for aqueous HI?
Hydriodic acid
What is the SI unit of energy?
Joule
What is the primary difference between ketones and aldehydes?
Ketones contain two functional groups and a double-bonded oxygen attached to a central carbon atom, while aldehydes contain only one functional group, a hydrogen atom, and a double-bonded oxygen atom bonded to the central carbon.
Which of the following is not a state of matter? Gas Liquid Lattice Solid
Lattice
What is the name for the reactant that is entirely consumed by the reaction?
Limiting reactant
What are the weak forces that exist between all molecules called?
London dispersion forces
Which of the following cannot be found on the periodic table? Bromine Magnesium oxide Phosphorous Chlorine
Magnesium oxide
Which of the following is true? Mass and weight are the same thing Mass is the quantity of matter an object has Mass equals twice the weight of an object Mass equals half the weight of an object
Mass is the quantity of matter an object has
What is the name of the device that separates gaseous ions by their mass-to-charge ratio?
Mass spectrometer
What is the typical way a solid would turn to a liquid and then to a gas?
Melting then vaporization
When atoms of one element are combined with atoms of another element, the result is a(n)
Molecule
Which of the following is not true of hydrocarbons? They are volatile They have low boiling points Nonpolar/London dispersion forces hold the hydrocarbon together Most hydrocarbons are solids
Most hydrocarbons are solids
What is the name of the binary molecular compound NO5?
Nitrogen pentoxide
What is the name for the horizontal rows of the periodic table?
Periods
What are two types of measurement important in science?
Quantitative and qualitative
What is the name for a reaction in which electrons are transferred from one atom to another?
Redox reaction
An exergonic reaction is one that:
Releases energy
Which of the following elements is an alkali metal? Magnesium Rubidium Hydrogen Chlorine
Rubidium
Which state of matter contains the least amount of kinetic energy?
Solid
The process of sublimation occurs when a ______ changes into a ______.
Solid, gas
What is freezing point?
The point at which a liquid changes to a solid
What are van der Waals forces?
The weak forces of attraction between two molecules
Which of the following statements is not true of most metals? They are good conductors of heat They are gases at room temperature They are ductile They make up the majority of elements on the periodic table
They are gases at room temperature
