chem test 2

what is the definition of a chemical property?

• ability to undergo chemical reactions and change into new substances

• ability to conduct electricity

• ability to change color

• ability to produce light

what separation technique is used for heterogenous mixtures?

• filtration

• evaporation

• condensation

• distillation

which separation technique is dependent upon different boiling points?

• chromatography

• evaporation

• filtration

• distillation

what contribution did democritus make to the modern atomic theory?

• he proposed the idea of an atom

• he proposed the theory of relativity

• he developed the periodic table

• he discovered the electron

what contribution did rutherford make to the modern atomic theory?

• invented the electron microscope

• discovered that the nucleus is very dense and has a positive charge through the gold-foil experiment

• discovered the existence of quarks

• developed the theory of relativity

what contribution did dalton make to the modern atomic theory?

• discovered the atomic theory

• stated that atoms are constantly changing and cannot be accurately studied

• believed that atoms are made up of even smaller particles called protons and neutrons

• argued that atoms are not the fundamental building blocks of matter and can be divided infinitely

what contribution did chadwick make to the modern atomic theory?

• invented the microscope

• discovered the neutron

• developed the periodic table

• discovered the electron

what contribution did bohr make to the modern atomic theory?

• bohr proposed that electrons move in random paths around the nucleus

• bohr proposed the planetary model of the atom with specific energy levels for electrons

• bohr discovered the neutron within the nucleus of the atom

• bohr suggested that the nucleus of the atom is made up of multiple smaller particles

what contribution did schroedinger make to the modern atomic theory?

• said electrons travel on a fixed orbit around the nucleus

• formulated the theory of relativity

• invented the periodic table

• discovered the electron

what contribution did mandeleev make to the modern atomic theory?

• he discovered the electron

• he formulated the law of conservation of mass

• he proposed the theory of relativity

• he created the periodic table of elements