Lipids Worksheet for learning about lipid chemistry and structure.
Lipids Worksheet with questions about organic molecules, elements in lipids, lipid formation, saturated and unsaturated fats, and examples of lipids in diet. Includes diagrams of lipid structures.
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Show Answer Key & Explanations
Step-by-step solution for: Solved Name: Pd: Lipids Worksheet 1. Are lipids organic | Chegg.com
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Show Answer Key & Explanations
Step-by-step solution for: Solved Name: Pd: Lipids Worksheet 1. Are lipids organic | Chegg.com
Let's go through each question on the Lipids Worksheet and provide clear, accurate answers with explanations.
---
Answer:
Yes, lipids are organic molecules.
Why? Because they are composed primarily of carbon, hydrogen, and oxygen atoms and are derived from living organisms. They contain carbon-hydrogen (C-H) bonds, which is a key characteristic of organic compounds.
---
Answer:
1. Carbon (C)
2. Hydrogen (H)
3. Oxygen (O)
*(Some lipids may also contain phosphorus, especially in phospholipids, but the main three are C, H, O.)*
---
Answer:
✔ a. Fatty acids to glycerol
Explanation:
This describes the formation of triglycerides—the most common type of lipid. Three fatty acid molecules attach to a glycerol backbone via ester linkages.
- Option b is incorrect because hydroxyl groups are part of glycerol, not what forms the bond.
- c. Cholesterols are steroids, not involved in forming typical triglycerides.
- d. Fatty acids don’t attach to carboxyl groups; instead, their carboxyl group reacts with glycerol’s hydroxyl group.
---
We have two structures:
#### Left molecule:
- All carbon chains are single-bonded (no double bonds).
- This indicates saturated fatty acid.
➡️ Answer: Saturated
#### Right molecule:
- There is a double bond between two carbons (highlighted in green).
- Presence of double bonds means it's unsaturated.
➡️ Answer: Unsaturated
---
Answer:
Double bond
Explanation:
Unsaturated lipids have one or more double bonds between carbon atoms in the fatty acid chain. These prevent tight packing and make them typically liquid at room temperature (like oils).
---
The structure shows:
- A glycerol backbone (three carbons)
- Three fatty acid chains attached
#### Labels:
- Glycerol backbone: The central 3-carbon chain
- Fatty acid chains: The long hydrocarbon tails attached to glycerol
#### Is it saturated or unsaturated?
- Look for double bonds.
- In this diagram, there is one double bond (indicated by a shorter line between two carbons).
- So, this is an unsaturated lipid.
✔ Answer:
- Left bracket: Glycerol backbone
- Right bracket: Fatty acid chains
- Type: Unsaturated
---
Options:
a. Bread
b. Meat
c. Oils/Fats/Waxes
d. Chocolate
Correct answers:
✔ b. Meat
✔ c. Oils/Fats/Waxes
✔ d. Chocolate
Explanation:
- Bread is mostly carbohydrates (starch), so low in lipids.
- Meat contains animal fats (lipids).
- Oils/fats/waxes are pure lipid sources.
- Chocolate contains cocoa butter (a lipid).
So, correct choices: b, c, d
---
Answer:
Olive oil, canola oil, avocado, nuts, or salmon
Explanation:
These contain monounsaturated or polyunsaturated fats, which are healthier and liquid at room temperature.
---
Answer:
Butter, cheese, red meat, coconut oil
Explanation:
These are solid at room temperature and come mainly from animal sources or tropical oils like coconut.
---
Answer:
Because lipids are hydrophobic (repel water). They consist of nonpolar hydrocarbon chains that do not interact well with polar water molecules. Water molecules form hydrogen bonds with each other but cannot form favorable interactions with the nonpolar lipid molecules.
---
Answer:
Oil floating on top of water — when you pour oil into water, it doesn't dissolve and forms a separate layer.
Or: Water beading up on a waxed car surface — the wax (a lipid) repels water, preventing it from soaking in.
---
| Question | Answer |
|--------|--------|
| 1 | Yes, because they contain carbon and are made by living organisms. |
| 2 | 1. Carbon, 2. Hydrogen, 3. Oxygen |
| 3 | a. Fatty acids to glycerol |
| 4 | Left: Saturated, Right: Unsaturated |
| 5 | Double bond |
| 6 | Glycerol backbone, Fatty acid chains → Unsaturated |
| 7 | b, c, d |
| 8 | Olive oil (or any plant oil, fish oil) |
| 9 | Butter (or cheese, red meat) |
| 10 | They are nonpolar and do not mix with polar water molecules. |
| 11 | Oil floats on water or water beads on waxed surfaces |
Let me know if you'd like this formatted as a printable answer sheet!
---
1. Are lipids organic molecules? Why or why not?
Answer:
Yes, lipids are organic molecules.
Why? Because they are composed primarily of carbon, hydrogen, and oxygen atoms and are derived from living organisms. They contain carbon-hydrogen (C-H) bonds, which is a key characteristic of organic compounds.
---
2. What elements do lipids contain?
Answer:
1. Carbon (C)
2. Hydrogen (H)
3. Oxygen (O)
*(Some lipids may also contain phosphorus, especially in phospholipids, but the main three are C, H, O.)*
---
3. Many lipids are formed by the attachment of three:
Answer:
✔ a. Fatty acids to glycerol
Explanation:
This describes the formation of triglycerides—the most common type of lipid. Three fatty acid molecules attach to a glycerol backbone via ester linkages.
- Option b is incorrect because hydroxyl groups are part of glycerol, not what forms the bond.
- c. Cholesterols are steroids, not involved in forming typical triglycerides.
- d. Fatty acids don’t attach to carboxyl groups; instead, their carboxyl group reacts with glycerol’s hydroxyl group.
---
4. Label the below lipids as either saturated or unsaturated.
We have two structures:
#### Left molecule:
- All carbon chains are single-bonded (no double bonds).
- This indicates saturated fatty acid.
➡️ Answer: Saturated
#### Right molecule:
- There is a double bond between two carbons (highlighted in green).
- Presence of double bonds means it's unsaturated.
➡️ Answer: Unsaturated
---
5. If a lipid molecule contains at least one ________, it is UNSATURATED.
Answer:
Double bond
Explanation:
Unsaturated lipids have one or more double bonds between carbon atoms in the fatty acid chain. These prevent tight packing and make them typically liquid at room temperature (like oils).
---
6. Label the parts of the below lipid molecule. Is this saturated or unsaturated lipid?
The structure shows:
- A glycerol backbone (three carbons)
- Three fatty acid chains attached
#### Labels:
- Glycerol backbone: The central 3-carbon chain
- Fatty acid chains: The long hydrocarbon tails attached to glycerol
#### Is it saturated or unsaturated?
- Look for double bonds.
- In this diagram, there is one double bond (indicated by a shorter line between two carbons).
- So, this is an unsaturated lipid.
✔ Answer:
- Left bracket: Glycerol backbone
- Right bracket: Fatty acid chains
- Type: Unsaturated
---
7. Lipids are found in:
Options:
a. Bread
b. Meat
c. Oils/Fats/Waxes
d. Chocolate
Correct answers:
✔ b. Meat
✔ c. Oils/Fats/Waxes
✔ d. Chocolate
Explanation:
- Bread is mostly carbohydrates (starch), so low in lipids.
- Meat contains animal fats (lipids).
- Oils/fats/waxes are pure lipid sources.
- Chocolate contains cocoa butter (a lipid).
So, correct choices: b, c, d
---
8. Give an example of an UNSATURATED lipid in your diet:
Answer:
Olive oil, canola oil, avocado, nuts, or salmon
Explanation:
These contain monounsaturated or polyunsaturated fats, which are healthier and liquid at room temperature.
---
9. Give an example of a SATURATED lipid in your diet:
Answer:
Butter, cheese, red meat, coconut oil
Explanation:
These are solid at room temperature and come mainly from animal sources or tropical oils like coconut.
---
10. Why are lipids "waterproof"?
Answer:
Because lipids are hydrophobic (repel water). They consist of nonpolar hydrocarbon chains that do not interact well with polar water molecules. Water molecules form hydrogen bonds with each other but cannot form favorable interactions with the nonpolar lipid molecules.
---
11. Give an example that illustrates lipids being waterproof.
Answer:
Oil floating on top of water — when you pour oil into water, it doesn't dissolve and forms a separate layer.
Or: Water beading up on a waxed car surface — the wax (a lipid) repels water, preventing it from soaking in.
---
✔ Final Answers Summary:
| Question | Answer |
|--------|--------|
| 1 | Yes, because they contain carbon and are made by living organisms. |
| 2 | 1. Carbon, 2. Hydrogen, 3. Oxygen |
| 3 | a. Fatty acids to glycerol |
| 4 | Left: Saturated, Right: Unsaturated |
| 5 | Double bond |
| 6 | Glycerol backbone, Fatty acid chains → Unsaturated |
| 7 | b, c, d |
| 8 | Olive oil (or any plant oil, fish oil) |
| 9 | Butter (or cheese, red meat) |
| 10 | They are nonpolar and do not mix with polar water molecules. |
| 11 | Oil floats on water or water beads on waxed surfaces |
Let me know if you'd like this formatted as a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of lipids worksheet.
