Liquids

Which two elements are liquid at room temperature?

• Bromine and Mercury

• Gallium and Helium

• Water and Ethanol

• Iron and Copper

What is the main reason liquids are rare among pure elements?

• Low boiling points

• High density

• Strong chemical bonds

• Delicate balance between thermal energy and intermolecular forces

Tags

NGSS.MS-PS1-4

What property of gallium is demonstrated by its ability to melt in your hand?

• Low melting point

• High boiling point

• Strong intermolecular forces

• High density

Tags

NGSS.MS-PS1-4

What are intermolecular forces compared to chemical bonds?

• Non-existent in liquids

• Equal in strength to covalent bonds

• Weaker than intramolecular bonds

• Stronger than ionic bonds

What allows nonpolar gases like helium to liquefy?

• Covalent bonding

• Ionic bonding

• London dispersion forces

• Hydrogen bonding

What is a consequence of hydrogen bonding in water?

• Low surface tension

• High boiling point

• Weak solvent capabilities

• Low viscosity

Tags

NGSS.MS-ESS2-4

Which phenomenon is NOT a result of molecular cohesion and adhesion?

• Surface tension

• Evaporation

• Viscosity

• Capillary action

What happens when heat is added to a solid?

• Molecules slow down

• The solid becomes denser

• Intermolecular forces increase

• Molecules gain kinetic energy

Tags

NGSS.MS-PS1-4

Why do phase transitions occur?

• Due to changes in molecular size

• As a result of chemical reactions

• Due to changes in molecular weight

• Because of the balance between kinetic energy and intermolecular forces

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What role do intermolecular forces play in the state of matter?

• They only affect gases

• They are essential for liquids and solids to exist

• They are irrelevant to the state of matter

• They prevent gases from forming

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4