Science Quiz

As you are heating a beaker of an unknown substance, your instructor asks if the substance is giving off an odor. Which procedure should you follow to safely determine if the substance has an odor?

• Pick up the beaker and let your lab partner smell it.

• 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.

• Atoms that combine do so in simple whole-number ratios.

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?

• The nucleus is not concentrated enough to deflect all alpha particles.

• 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

• was referred to as the “plum pudding model.”

• was the discovery that electrons surround a dense nucleus.

• proposed that electrons travel in circular orbits around the nucleus.

• is the quantum mechanical model.

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

• 102

• 125

Which of these statements is false?

• Electrons have a negative charge.

• Electrons have a mass of 1 amu.

• The nucleus of an atom is positively charged.

• Neutrons are found in the nucleus of an atom.

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

• atomic number = 11 and mass number = 12

• atomic number = 12 and mass number = 11

• atomic number = 11 and mass number = 23

• atomic number = 23 and mass number = 12

Choose the correct formula for calcium hydrogen phosphate.

• CaHPO₄

• Ca₂HPO₄

• Ca(H₂PO₄)₂

• Ca(HPO₄)₂