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What is the neutral particle that is formed when atoms share electrons?
a. cation
b. ionic compound
c. molecule
d. nucleus
c. molecule
All of the following are examples of physical changes except
a. melting
b. evaporating
c. burning
d. solidifying
c. burning
Matter that has a definite volume but no definite shape is a
a. liquid
b. solid
c. gas
d. plasma
a. liquid
the phase change in which a substance changes from a liquid to a gas is
a. deposition
b. sublimation
c. condensation
d. vaporization
d. vaporization
A chemical bond that occurs when atoms share electrons is a(n) _____ bond.
a. covalent
b. ionic
c. magnetic
d. polyatomic
a. covalent
Which phrase best describes a metallic bond?
a. a bond that is formed by a metal
b. the attraction between a metal anion and the shared pool of electrons
c. a bond that forms between a metal and nonmetal
d. the attraction between a metal cation and a shared pool of electrons.
d. the attraction between a metal cation and a shared pool of electrons.
When two or more substances are combined so each substance can be separated by physical means, the result is a(n)
a. chemical change
b. compound
c. element
d. mixture
d. mixture
____ charges repel, whereas ______ charges attract
a. Like, opposite
b. Opposite, like
c. Positive, negative
d. Negative, positive
a. Like, opposite
Which subatomic particle has a negative charge?
a. electron
b. alpha particle
c. neutron
d. proton
a. electron
Lighting is
a. a buildup of neutrons
b. harmless
c. a high-voltage electric current
d. a large discharge of static electricity
d. a large discharge of static electricity
Resistance is measured in a unit called the
a. ampere
b. coulomb
c. ohm
d. volt
c. ohm
Niels Bohr's model of the atom, electrons move
a. like balls rolling down a hill
b. like planets orbiting the sun
c. like popcorn in a popcorn popper
d. like beach balls on water waves
b. like planets orbiting the sun
The coefficients in a balanced chemical equation always can express the ratio of
a. moles of reactants and products
b. volume of reactants and products
c. atoms of reactants and products
d. mass of reactants and products
a. moles of reactants and products
____ is NOT a homogeneous mixture.
a. A salad
b. Glue
c. Vinegar
d. Gelatin
a. A salad
a. freezing
b. melting
c. sublimation
d. condensation
b. melting
Which of the following Group 1A elements is most reactive?
a. Cs (cesium)
b. Li (lithium)
c. K (potassium)
d. Na (sodium)
a. Cs (cesium)
The current in a hair dryer measures 15 amps. The Resistance of the hair dryer is 8 ohms. What is the voltage?
a. 120 V
b. 0.5V
c. 7V
d. 1800V
a. 120 V
a. atomic numbers
b. atomic mass
c. isotopes
d. outer level electrons
d. outer level electrons
A cork is able to float on water because it is
a. a crystalline solid
b. equal in density to water
c. small in size
d. less dense than the water
d. less dense than the water
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is
a. 26
b. 30
c. 52
d. 56
d. 56
Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element?
a. isotope number
b. atomic number
c. atomic mass unit
d. mass number
b. atomic number
Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best describe this interaction?
a. diffraction
b. destructive interference
c. standing wave formation
d. constructive interference
b. destructive interference
As a sample of matter is heated, its particles
a. are unaffected
b. move more quickly
c. move more slowly
d. stop moving
b. move more quickly
The Greek philosopher Democritus coined what word for tiny piece of matter that cannot be divided?
a. element
b. atom
c. electron
d. molecule
b. atom
The law that states that the volume of gas is directly proportional to its temperature in kelvins if the pressure and the number of particles is constant is
a. Boyle's Law
b. Bose's Law
c. Einsteins's Law
d. Charles's Law
d. Charles's Law