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100
(1) 1 u
What is the approximate mass of a proton? (1) 1 u (2) 0.005 u (3) 1 g (4) 0.005 g
100
(4) number of valence electrons
The elements in Group 2 have similar chemical properties because each atom of these elements has the same: (1) atomic number (2) mass number (3) number of electron shells (4) number of valence electrons
100
(2) arsenic
Which substance can not be broken down by a chemical change? (1) ammonia (2) arsenic (3) ethane (4) propanal
100
(4) the two atoms collide with sufficient energy to form a bond
Two hydrogen atoms form a hydrogen molecule when: (1) one atom loses a valence electron to the other atom (2) one atom shares four electrons with the other atom (3) the two atoms collide and both atoms gain energy (4) the two atoms collide with sufficient energy to form a bond
100
(3) amine
Which class of organic compounds contains nitrogen? (1) aldehyde (2) alcohol (3) amine (4) ether
200
(3) an atom in an excited state
An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes: (1) a positive ion (2) a negative ion (3) an atom in an excited state (4) an atom in the ground state
200
(2) a diatomic molecule
What is formed when two atoms of bromine bond together? (1) a monatomic molecule (2) a diatomic molecule (3) a heterogenous mixture (4) a homogenous mixture
200
(1) The iron loses its metallic properties.
Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature? (1) The iron retains its magnetic properties. (2) The iron loses its metallic properties. (3) The sulfur gains magnetic properties. (4) The sulfur gains metallic properties.
200
(3) empirical formula
Which type of formula represents the simplest whole-number ratio of atoms of the elements in a compound? (1) molecular formula (2) condensed formula (3) empirical formula (4) structural formula
200
(3) esterification
Which term identifies a type of organic reaction? (1) depostion (2) distillation (3) esterification (4) sublimation
300
(2) neutron
Which particle has no charge? (1) electron (2) neutron (3) positron (4) proton
300
(3) nature of the bonds between the gold atoms
Gold can be flattened into an extremely thin sheet. The malleability of gold is due to the: (1) radioactive decay mode of the isotope Au-198 (2) proton-to-neutron ration in an atom of gold (3) nature of the bonds between gold atoms (4) reactivity of gold atoms
300
(4) temperature
Which property is a measure of the average kinetic energy of the particles in a samples of matter? (1) mass (2) density (3) pressure (4) temperature
300
(2) the mole ratios of the substances in the reaction
The coefficients in a balanced chemical equation represent: (1) the mass ratios of the substances in the reaction (2) the mole ratios of the substances in the reaction (3) the total number of electrons in the reaction (4) the total number of elements in the reaction
300
(2) butyne
Which compound is classified as a hydrocarbon? (1) butanal (2) butyne (3) 2-butanol (4) 2-butanone
400
(1) atomic number
Which quantity represents the number of protons in an atom? (1) atomic number (2) oxidation number (3) number of neutrons (4) number of valence electrons
400
(1) electronegativity
Which term represents the attraction one atom has for the electrons in a bond with another atom? (1) electronegativity (2) electrical conductivity (3) first ionization energy (4) mechanical energy
400
(4) The collisions of the gas particles may result in the transfer of energy.
According to the kinetic molecular theory, which statement describes the particles of an ideal gas? (1) The gas particles are arranged in a regular pattern. (2) The force of attraction between the gas particles is strong. (3) The gas particles are hard spheres in continuous circular motion. (4) The collisions of the gas particles may result in the transfer of energy.
400
(1) lower energy and higher entropy
Systems in nature tend to undergo changes toward: (1) lower energy and higher entropy (2) lower energy and lower entropy (3) higher energy and higher entropy (4) higher energy and lower entropy
400
(1) equal to the number of electrons gained
In oxidtion-reduction reaction, the number of electrons lost is: (1) equal to the number of electrons gained (2) equal to the number of protons gained (3) less than the number of electrons gained (4) less than the number of protons gained
500
(3) nonmetal
The element sulfur is classified as a: (1) metal (2) metalloid (3) nonmetal (4) noble gas
500
(4) mixture because the proportion of its components can vary
Salt water classified as a: (1) compound because the proportion of its atoms is fixed (2) compound because the proportion of its atoms can vary (3) mixture because the proportion its components is fixed (4) mixture because the proportion of its components can vary
500
(2) parts per million
The concentration of a solution can be expressed in: (1) milliliters per minute (2) parts per million (3) grams per kelvin (4) joules per gram
500
(2) C4H8
Which formula represents an organic compound? (1) CaH2 (2) C4H8 (3) H2O2 (4) P2O5
500
(3) NaOH(s)
Which substance is an electrolyte? (1) C6H12O6(s) (2) C2H5OH(l) (3) NaOH(s) (4) H2(g)