Which of the following best describes the octet rule?

• A. Atoms form bonds to achieve a full outer shell of 8 electrons.
• B. Atoms form bonds to gain protons.
• C. Atoms form bonds to achieve neutrality.
• D. Atoms form bonds to decrease atomic size.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the structure of an ionic compound?

• A. Individual molecules.
• B. Orderly repeating three-dimensional lattice of ions.
• C. A continuous flow of electrons.
• D. A random arrangement of atoms.

Tags

NGSS.HS-PS1-3

Why do ionic compounds conduct electricity when dissolved in water?

• A. Because of free-moving protons.
• B. Because of free-moving electrons.
• C. Because of free-moving ions.
• D. Because of covalent bonds.

Which compound would have a stronger bond strength?

• A. NaCl
• B. MgO
• C. LiCl
• D. KBr

What type of elements typically form covalent bonds?

• A. Metals and non-metals
• B. Non-metals
• C. Metals
• D. Noble gases

Tags

NGSS.HS-PS1-1

Which of the following is true about the octet rule?

• A. It applies to all atoms without exception.
• B. Hydrogen can hold 8 electrons.
• C. Elements in the 3rd row and below can sometimes exceed 8 electrons.
• D. Boron can only hold 8 electrons in its valence shell.

What type of bond forms if two atoms have an electronegativity difference of 0.3?

• A. Ionic
• B. Non-polar covalent
• C. Polar covalent
• D. Metallic

What is a binary acid?

• A. An acid composed of hydrogen and a polyatomic ion.
• B. An acid composed of hydrogen and a nonmetal.
• C. An acid that contains more than three elements.
• D. An acid with a neutral pH.

Which of the following acids is an example of ternary acids?

• hydrobromic acid

• nitric acid

• hydrogen sulfide

• hydrogen chloride

What is the correct name for NaOH?

• A. Sodium oxide
• B. Sodium peroxide
• C. Sodium hydroxide
• D. Sodium hydride