U3 Biochemistry Comprehension Check Concept 1-3

Picture this! You're chilling out, observing a glass of water. You notice something interesting - the water molecules seem to be best buddies, sticking together like glue. What do we call this friendly phenomenon?

• adhesion
• solution
• cohesion
• polar molecule

Imagine you're a tiny molecule in a glass of water. Which of the following would you find the hardest to mingle with?

• polar sugar molecules
• salt made of a positive sodium ion and a negative chloride ion
• nonpolar fats and oils
• all of the substances will dissolve easily in water

Imagine you are in a chemistry lab and you have a substance in front of you. How would you identify it as an acid?

• It would release hydrogen ions (H+) when mixed with water
• It would release hydroxide ions (OH-) when mixed with water
• It would maintain a stable pH
• It would speed up chemical reactions

What are bases?

• Substances that release hydrogen ions (H+) in water
• Substances that release hydroxide ions (OH-) in water
• Substances that maintain a stable pH
• Substances that speed up chemical reactions

What are buffers?

• Substances that release hydrogen ions (H+) in water
• Substances that release hydroxide ions (OH-) in water
• Substances that maintain a stable pH
• Substances that speed up chemical reactions

Imagine you are studying for a biology test. You come across a section about enzymes. Based on your understanding, what would you say enzymes are?

• They are substances that release hydrogen ions (H+) in water

• They are biological catalysts that speed up chemical reactions in living organisms

• They are substances that release hydroxide ions (OH-) in water

• They are substances that maintain a stable pH

Large bodies of water do not quickly fluctuate in temperature. Why?

• Water is a solvent.
• Water has a high heat capacity.
• Water acts as a buffer.
• Water is non-polar.

During a science experiment, John noticed that water is often referred to as a universal solvent because...

• It can be found in every corner of his lab

• It turns into ice when the temperature drops

• It floats when it turns into ice

• It has the ability to dissolve most of the substances he used in his experiments

The tightness across the surface of water that enables paper clips to float is ____________.

• adhesion
• capillary action
• surface tension
• polarity

Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds