Biology Unit 2 Review

What is the smallest unit of matter that retains the properties of an element?

• Molecule
• Particle
• Compound
• Atom

Which subatomic particle has a positive charge?

• Proton
• Neutron
• Ion
• Electron

Which of the following is an example of a compound?

• Nitrogen
• Oxygen
• Water
• Hydrogen

An acidic solution has a pH value:

• Less than 7
• Equal to 7
• Equal to 0
• Greater than 7

Which of the following is a characteristic of bases?

• They taste sour
• They have a high concentration of H+ ions
• They turn litmus paper blue
• They have a pH less than 7

What are the roles of solvents and solutes in a solution?

• Solute gets dissolved in the solvent
• Solute dissolves the solvent
• Solvent dissolves the solute
• Solvent increases the concentration of the solution
• Solute provides the medium for the solution

Which two of the following statements are true about acids?

• Acids have a pH value below 7
• Acids produce H+ ions in solution
• Acids taste sweet
• Acids have a pH value above 7
• Acids turn litmus paper blue

What is the property of water that allows it to stick to other substances?

• Adhesion
• Cohesion
• Capillarity
• Bonding

Which of the following involve cohesion?

• Ink sticking to paper
• Formation of water droplets
• Ice melting into water
• Oil spreading on water surface
• Formation of spherical mercury droplets