Chem questions

t or f, the sum of the superscripts in an electron configuration represents the total number of neutrons in the atom

t or f, the outermost electrons (highest energy) are the electrons involved in reactions

t or f as electrons are filling the shell, they fill the highest energy shell first and then subsequent shells

t or f, electrons within an orbital have similar energies (all 1s electrons have the same energy, all 2s electrons have the same energy, etc.)

t or f columns in the periodic table are called groups

t or f, alkali metals are group 6 in the periodic table

t or f, calcium is an alkaline earth metal

t or f, the halogens are very reactive because they have an unpaired electron in the outer p-orbital

t or f, the noble gases are reactive because all their orbitals are filled

t or f, atoms tend to gain or lose electrons until they have obtained an electronic configuration that is the same as that of a noble gas (filled outer s and p shells)

t or f, a milligram (mg) is 1x10^-3g

a calculator answer is 824.6059 must be rounded off to three sig fig. what answer is reported?

absolute zero is

a solid substance is subjected to a number of tests and observations. What test result would be classified as a chemical property of the substance

what is an example of a physical change?

the cubic centimeter cm3 has the same volume as a

density equation?

how many centigrams are in 1 kilogram?

the ratio of the mass of a substance to its volume is its

an element is a substance which

which of the following pairs of subatomic particles have charges of equal magnitude but opposite in sign?

the nucleus of an atom is composed of

an atom is electrically neutral because

oxygen consists of three different ____, each having 8 protons but different number of neutrons

as the mass number of the isotopes of an element increases, the number of protons

all atoms of the same element have the same

elements that is a nonmetal?

which of the following elements is a noble gas?

consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is

valence electrons are electrons located

how many electrons can occupy the s sublevel at each energy level?

how many electrons can occupy the p sublevel at each energy level?

metals from group 2 of the periodic table form ions with a charge of

what pair of electrons is isoelectric?

which element has the smallest atomic radii?

which element has the largest atomic radius?

which 3 elements are likely to have similar chemical and physical properties/

t of f, ionic compounds usually contain both a metallic and non-metallic element

t or f, in the molecule BF_3, the boron atom is an exception to the octet rule

t or f, three electrons shared between two atoms correspond to a triple bond

t or f resonance occurs when two or more different, valid lewis structures can be drawn for a molecule

t or f, because the C-Cl bond in CCl₄  is polar, the CCl₄ molecule will also be polar

t or f, is the molecule NH₃ nonpolar?

t or f, the mole is the chemical unit of amount and represents a count of 6.02x10²³ items

the compound CaI₂ is named

what is the correct chemical formula for sodium carbonate?

the correct name for the compound NF₇ is ?

the correct name for the compound, MnO₂ is

what is the correct name of the compound HCl?

what is the correct formula for sulfuric acid?

what is the correct name for the compound Al₂(CO₃)₃?

what atom will most likely be the central atom in a molecule consisting of one atom each of carbon, oxygen, chlorine and hydrogen?

how many bonding pairs are around the central atom in the lewis structure of CO₂

how many nonbonding pairs are around the central atom in the lewis structure of the molecule H2O?

according to the VSEPR theory, what is the molecular geometry of H2O?

t or f, osmosis may be definied as the movement of a solvent through a semipermeable membrane from a region of lower solute concentration to one of higher solute concentration

t or f, in normal room lighting, the eye can distinguish a true solution from a colloidal one

t or f, the heavier the solute molecule is, the greater the effect on the freezing point of a solution

t or f, the amount of freezing point depression or boiling point elevation depends only on the number of the solute particles added to the solution

t or f, the solubility of gases increases significantly at higher temps

t or f, osmotic pressure is the amount of pressure required to stop the flow across a semipermeable membrane

t or f, the boiling point of water is increased by dissolving salt in the water

t or f, ionic substances tend to dissolve easily in water

t or f, an aqueous solution of 8.38 molal ethylene glycol would show a decrease in freezing point of 15.6 C

which molecule can form hydrogen bonds?

which of the following solutions would have the lowest freezing point?

in a solution, the solvent

in water, a substance that does not dissociate in solution is called a

what type of liquid displays the tyndall effect?

determine the type of intermolecular attraction in each of the following substances and choose the one expected to have the highest boiling point?

what property of liquids explains the formation of spherical water droplets on green leaves?

to find normality?

to which elements must hydrogen be bonded in order to display hydrogen bonding?

t or f, a liquid state will have a lower entropy than a solid state

t or f, a catalyst increases the rate of a chemical reaction and is not consumes in the process

t or f, the oxidizing agent is oxidized during an oxidation reduction reaction

t or f,the conversion of Mn2+ to  Mn 4+ is an oxidation reaction

t or f, a reaction is carried out in a coffee cup calorimeter. It is observed that the temperature of the contents of the calorimeter decreases. this means that the reaction is endothermic

t or f, the addition of an acid to water increases the [h30+] and decreases the pH

t or f,according the le chateliers principle, an increase in pressure applied to a mixture of gases at equilibrium will shift the reaction toward the side with more moles of gas

t or f,when the equilibrium constant for a reversible reaction is much greater than one, the equilibrium is said to lie to the right

t or f, when heat is added to an exothermic reaction, the reaction shifts to form more reactant

what word is used to describe a solution that contains a conjugate acid-base pair and is resistant to large changes in pH?

what will increase the rate of a reaction?

a substance that can behave as either an acid or a base is

the reaction of a strong acid with a strong bases produces a salt and another product. What is the identity of the other product?

the difference between a strong acid and a weak acid is that the strong acid ionizes ____ where as the weak acid ionizes ____

which species is a diprotic acid?

what is the conjugate base of H2SO4?

what generic process occurs at the anode of a voltaic cell?