Science Quiz

As you are heating a beaker of an unknown substance, you need to determine if there is an odor. Which procedure should you follow to safely determine if the substance has an odor?

• Put on your safety goggles and place your nose over the beaker.

• Turn off the heat source and sit for 10 minutes.

• Wave the fumes from the beaker toward your nose.

Which of the following is NOT a part of Dalton’s atomic theory?

• All elements are composed of atoms.

• Atoms of the same element are alike.

• Atoms are always in motion.

Thomson's model of the atom included negative _______ embedded in a ball of _______ charge.

Why were so few alpha particles strongly deflected in Rutherford's experiment (Gold foil experiment)?

• Alpha particles move too quickly to be deflected very often.

• Alpha particles are attracted to the negative clouds of the atoms.

• Atomic nuclei are very small, so few alpha particles impact them.

JJ Thompson’s contribution to the development of atomic structure ___________.

Isotopes of the same element have different _____________.

What is the total number of subatomic particles (protons, electrons, and neutrons) in an atom of vanadium-51?

• 51

• 74

Which of these statements is false?

• Electrons have a negative charge.

• Electrons have a mass of 1 amu.

• Neutrons are found in the nucleus of an atom.

What is the atomic number of an atom with 11 protons and 12 neutrons?

• 11

• 12

• 23

What is the mass number of an atom with 11 protons and 12 neutrons?

• 11

• 12

• 23