chemistry exam review 3

Mendeleev developed a periodic table of elements based largely on atomic mass. which development in the early 1900's extended and supported Mendeleev's arrangement of elements on the periodic table? a) spectral determination of atomic numbers b) measurement of decay rates of atomic particles c) calculation of electronic charges in atomic orbitals d) classification of the types of atomic bonding

a

the noble gases have a) high ionization energies b) high electron affinities c) large atomic radii d) form cations and anions

a

the periodic law states that a) the chemical properties of elements can be grouped according to periodicity b) the properties of the elements are functions of atomic mass c) all elements in the same group have the same number of valence electrons d) all elements with the same number of occupied energy levels must be in the same group

a

boiling point, density, conductivity, and color may all be classified as the ___________________________ of a substance a) nuclear properties b) physical properties c) chemical properties d) reactive properties

b

which two elements are more likely to have the same charge on their ions? a) Se and As b) Sn and Si c) Ca and Rb d) I and Xe

b

which type of mixture forms when sugar is completely dissolved in water? a) compound b) solution c) colloid d) suspension

b

which statement accurately describes mixtures and compounds? a) mixtures and compounds require separation by physical means b) mixtures and compounds require separation by chemical means c) mixtures can be separated by physical means, while compounds requires to be separated by chemical means d) mixtures require to be separated by chemical means, while compunds can be separated by physical means

c

which of the following statements is true a) electrons travel around the nucleus in circular orbits b) the bohr atom is the model currently accepted for electrons in atoms c) an electrons position and energy can be known with certainty d) scientists know the energies of electrons but only approximate areas where the electrons are probably located

d