Unit 1 - Chemistry of Life

What are the two main elements that compose water?

• Hydrogen and nitrogen

• Oxygen and carbon

• Oxygen and hydrogen

• Carbon and nitrogen

What type of bond involves the sharing of electrons between atoms?

• Ionic bond

• Metallic bond

• Covalent bond

• Hydrogen bond

What is the result of oxygen being more electronegative than hydrogen in a water molecule?

• Equal sharing of electrons

• Non-polarity

• Unequal sharing of electrons

• Formation of ionic bonds

What is a hydrogen bond?

• A strong bond between two atoms

• A weak bond interaction between the negative and positive regions of two separate molecules

• A bond formed by sharing electrons

• A bond formed by transferring electrons

What is the term for hydrogen bonds forming between two of the same molecules?

• Adhesion

• Cohesion

• Fusion

• Diffusion

What property of water is responsible for surface tension?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Metallic bonds

Which of the following allows water to demonstrate its emergent properties?

• Evaporation

• Cohesion, adhesion, and surface tension

• Freezing

• Condensation

Why is life dependent on water's properties?

• Water is a good solvent

• Water is non-polar

• Water is a solid at room temperature

• Water has a low specific heat

What does the law of conservation of energy state?

• Energy can be created and destroyed

• Energy can only be transformed, not created or destroyed

• Energy is unlimited

• Energy is only used by living systems

Why do living systems need a constant input of energy?

• To change their chemical structure

• To grow, reproduce, and maintain organization

• To destroy other systems

• To create new energy