Chemistry Of Life Worksheet 1 - Free Printable
Educational worksheet: Chemistry Of Life Worksheet 1. Download and print for classroom or home learning activities.
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Step-by-step solution for: Chemistry Of Life Worksheet 1
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Show Answer Key & Explanations
Step-by-step solution for: Chemistry Of Life Worksheet 1
Let's go through each question one by one using the information provided in the chart and the background knowledge about atoms.
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| Element | Symbol | Atomic Number | Atomic Mass | Percent in Human Body |
|--------------|--------|---------------|-------------|------------------------|
| Hydrogen | H | 1 | 1 | 9.5% |
| Carbon | C | 6 | 12 | 18.5% |
| Nitrogen | N | 7 | 14 | 3.0% |
| Oxygen | O | 8 | 16 | 65.0% |
| Phosphorus | P | 15 | 31 | 1.0% |
| Sulfur | S | 16 | 32 | 0.3% |
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1. What element is the most abundant in the human body? What is its symbol?
✔ Answer: The most abundant element is Oxygen, and its symbol is O.
> Reason: It has the highest percentage (65.0%) in the human body.
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2. What is the atomic number of the element in question 1?
✔ Answer: The atomic number of oxygen is 8.
> Found directly in the chart under "Atomic Number" for oxygen.
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3. What makes up to 18.5 percent of the body? What is its symbol?
✔ Answer: Carbon makes up 18.5% of the body, and its symbol is C.
> From the chart, carbon has a 18.5% value.
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4. Write the atomic number of phosphorus. How many protons does it have?
✔ Answer: The atomic number of phosphorus is 15, so it has 15 protons.
> Atomic number = number of protons.
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5. Finish the word equation:
✔ Answer:
Atomic mass = the number of protons + the number of neutrons
> This is a basic formula: Atomic mass ≈ protons + neutrons (electrons are negligible in mass).
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6. What is the atomic mass of nitrogen?
✔ Answer: The atomic mass of nitrogen is 14.
> From the chart, nitrogen’s atomic mass is listed as 14.
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7. What is the number of neutrons of nitrogen?
✔ Answer:
To find the number of neutrons:
Neutrons = Atomic mass – Atomic number
Nitrogen:
- Atomic mass = 14
- Atomic number = 7
So, 14 – 7 = 7 neutrons
✔ Answer: 7 neutrons
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8. How many neutrons are there in the nucleus of a nitrogen atom?
✔ Answer: 7 neutrons
> Same as question 7. Nitrogen has 7 protons and 7 neutrons.
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9. Write the symbol of the element found in only 0.3 percent of human body.
✔ Answer: The element is Sulfur, and its symbol is S.
> From the chart, sulfur is 0.3% in the human body.
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10. Which element in the chart has no neutrons?
✔ Answer: Hydrogen (H)
> Explanation: Hydrogen has an atomic mass of 1 and atomic number of 1.
- Protons = 1
- Neutrons = Atomic mass – Protons = 1 – 1 = 0
> So, hydrogen (specifically the most common isotope, protium) has no neutrons.
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1. Oxygen, O
2. 8
3. Carbon, C
4. 15; 15 protons
5. protons; neutrons
6. 14
7. 7 neutrons
8. 7 neutrons
9. S
10. Hydrogen (H)
Let me know if you'd like this formatted as a printable answer sheet!
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Chart Summary:
| Element | Symbol | Atomic Number | Atomic Mass | Percent in Human Body |
|--------------|--------|---------------|-------------|------------------------|
| Hydrogen | H | 1 | 1 | 9.5% |
| Carbon | C | 6 | 12 | 18.5% |
| Nitrogen | N | 7 | 14 | 3.0% |
| Oxygen | O | 8 | 16 | 65.0% |
| Phosphorus | P | 15 | 31 | 1.0% |
| Sulfur | S | 16 | 32 | 0.3% |
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Questions & Answers:
1. What element is the most abundant in the human body? What is its symbol?
✔ Answer: The most abundant element is Oxygen, and its symbol is O.
> Reason: It has the highest percentage (65.0%) in the human body.
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2. What is the atomic number of the element in question 1?
✔ Answer: The atomic number of oxygen is 8.
> Found directly in the chart under "Atomic Number" for oxygen.
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3. What makes up to 18.5 percent of the body? What is its symbol?
✔ Answer: Carbon makes up 18.5% of the body, and its symbol is C.
> From the chart, carbon has a 18.5% value.
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4. Write the atomic number of phosphorus. How many protons does it have?
✔ Answer: The atomic number of phosphorus is 15, so it has 15 protons.
> Atomic number = number of protons.
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5. Finish the word equation:
✔ Answer:
Atomic mass = the number of protons + the number of neutrons
> This is a basic formula: Atomic mass ≈ protons + neutrons (electrons are negligible in mass).
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6. What is the atomic mass of nitrogen?
✔ Answer: The atomic mass of nitrogen is 14.
> From the chart, nitrogen’s atomic mass is listed as 14.
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7. What is the number of neutrons of nitrogen?
✔ Answer:
To find the number of neutrons:
Neutrons = Atomic mass – Atomic number
Nitrogen:
- Atomic mass = 14
- Atomic number = 7
So, 14 – 7 = 7 neutrons
✔ Answer: 7 neutrons
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8. How many neutrons are there in the nucleus of a nitrogen atom?
✔ Answer: 7 neutrons
> Same as question 7. Nitrogen has 7 protons and 7 neutrons.
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9. Write the symbol of the element found in only 0.3 percent of human body.
✔ Answer: The element is Sulfur, and its symbol is S.
> From the chart, sulfur is 0.3% in the human body.
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10. Which element in the chart has no neutrons?
✔ Answer: Hydrogen (H)
> Explanation: Hydrogen has an atomic mass of 1 and atomic number of 1.
- Protons = 1
- Neutrons = Atomic mass – Protons = 1 – 1 = 0
> So, hydrogen (specifically the most common isotope, protium) has no neutrons.
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✔ Final Answers:
1. Oxygen, O
2. 8
3. Carbon, C
4. 15; 15 protons
5. protons; neutrons
6. 14
7. 7 neutrons
8. 7 neutrons
9. S
10. Hydrogen (H)
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 the chemistry of life worksheet answer key.
