Honors Chem SLO review

The temperature in a room is 25C. What is this temperature on the Kelvin scale?

• 248 K

• -248 K

• -298 K

• 298 K

Which of these statements would John Dalton have agreed with?

• Atoms of the same element can have different numbers of protons.

• Atoms of the same element always have the same number of neutrons.

• All elements are composed of atoms.

• Atoms are divisible.

Which of the following correctly lists the particles, in order, from least massive to most massive?

• hydrogen atom, electron, helium atom, proton

• proton, electron, hydrogen atom, helium atom

• proton, helium atom, hydrogen atom, electron

• electron, proton, hydrogen atom, helium atom

Which of the following statements is not consistent with the results obtained in Rutherford's gold foil experiment?

• Atoms are composed mainly of empty space.

• The nucleus of an atom is positively charged.

• The nucleus of an atom contains almost all of the mass of that atom.

• Electrons are contained in the nucleus of an atom.

What is the atomic number and the mass number of an atom of an element with 15 protons and 16 neutrons?

• atomic number = 15 and mass number = 16

• atomic number = 16 and mass number = 15

• atomic number = 15 and mass number = 31

• atomic number = 31 and mass number = 15

An atom of hydrogen-3 contains:

• 1 proton, 1 electron, and 1 neutron.

• 1 proton, 2 electrons, and 0 neutrons.

• 1 proton, 1 electrons, and 0 neutrons.

• 1 proton, 1 electron, and 2 neutrons.

An atom of uranium that contains 92 protons and 143 neutrons would be written as:

• uranium-143.

• uranium-92.

• uranium-235.

• uranium-184.

Isotopes of the same element have:

• the same number of neutrons, but different numbers of protons.

• the same number of protons, but different numbers of neutrons.

• the same number of protons, but different numbers of electrons.

• the same number of neutrons, but different numbers of electrons.

The relative abundance of each isotope of an element determines its:

• number of electrons.

• atomic number.

• average atomic mass.

• number of protons.

How many significant figures are in the measurement 603.040 g?

• 5

• 3

• 4

• 6