Amelia Quiz

What are the smallest units of matter that retain an element's identity?

• Molecules
• Atoms
• Compounds
• Protons

Which of the following best describes how our understanding of atoms has changed over time?

• The atomic model has remained the same.
• Scientists immediately understood atomic structure.
• New discoveries have led to changes in the atomic model.
• Atoms have always been thought to have a nucleus.

Which part of the atom has a negative charge?

• Proton
• Neutron
• Electron
• Nucleus

Which of the following can be predicted using the periodic table?

• An element's chemical and physical properties
• The exact number of atoms in a compound
• The color of an element
• The exact weight of a sample

According to the kinetic molecular theory, how do gas particles behave?

• They stay in fixed positions.
• They move freely and collide with each other.
• They move slower than solids.
• They vibrate in place.

Which of the following is a pure substance?

• Saltwater
• Gold (Au)
• Air
• Sand

What type of change occurs when water freezes?

• Chemical change
• Physical change
• Nuclear change
• Ionization

Which of the following is a chemical property of a substance?

• Color
• Density
• Flammability
• Melting point

What happens to atoms during a chemical reaction?

• They are destroyed.
• They disappear.
• They rearrange to form new substances.
• They change into different elements.

Which type of bond involves the transfer of electrons from one atom to another?

• Ionic bond
• Covalent bond
• Metallic bond
• Hydrogen bond