Question

1. elements for life:

ingredient	what we observe	is it alive?
nitrogen
oxygen
hydrogen
sulfur
phosphorus

Explanation:

To fill the table, we analyze each element:

Carbon

• What We Observe: Carbon is a non - living element. It exists as atoms, in compounds like carbon dioxide ($\ce{CO_2}$) or in the structure of organic molecules (but the element itself is not alive). It has properties like forming covalent bonds, being part of the carbon cycle, etc.
• Is It Alive?: No (elements are not alive; life is composed of molecules and cells made of these elements, but the elements themselves lack life characteristics like growth, reproduction, response to stimuli).

Nitrogen

• What We Observe: Nitrogen is a gas (as $\ce{N_2}$ in the atmosphere) or in compounds like ammonia ($\ce{NH_3}$), nitrates ($\ce{NO_3^-}$). It is non - living, involved in the nitrogen cycle (e.g., nitrogen fixation by bacteria, but the element nitrogen is not alive).
• Is It Alive?: No.

Oxygen

• What We Observe: Oxygen is a gas ($\ce{O_2}$) or in compounds like water ($\ce{H_2O}$) or oxides. It is non - living, essential for respiration in living organisms, but the element itself has no life.
• Is It Alive?: No.

Hydrogen

• What We Observe: Hydrogen is a gas ($\ce{H_2}$) or in compounds like water ($\ce{H_2O}$), hydrocarbons. It is non - living, a component of many biological molecules, but the element is not alive.
• Is It Alive?: No.

Sulfur

• What We Observe: Sulfur can be in elemental form (yellow solid) or in compounds like sulfates ($\ce{SO_4^{2 - }}$), hydrogen sulfide ($\ce{H_2S}$). It is non - living, involved in biological processes (e.g., in some proteins), but the element is not alive.
• Is It Alive?: No.

Phosphorus

• What We Observe: Phosphorus can be in elemental form (white or red phosphorus) or in compounds like phosphates ($\ce{PO_4^{3 - }}$). It is non - living, essential for DNA, ATP, etc., in living organisms, but the element is not alive.
• Is It Alive?: No.

Ingredient	What We Observe	Is It Alive?
Nitrogen	Exists as $\ce{N_2}$ gas, in compounds (e.g., $\ce{NH_3}$, $\ce{NO_3^-}$). Non - living, part of nitrogen cycle.	No
Oxygen	Exists as $\ce{O_2}$ gas, in compounds (e.g., $\ce{H_2O}$, oxides). Non - living, used in respiration.	No
Hydrogen	Exists as $\ce{H_2}$ gas, in compounds (e.g., $\ce{H_2O}$, hydrocarbons). Non - living, component of biomolecules.	No
Sulfur	Exists as elemental solid, in compounds (e.g., $\ce{SO_4^{2 - }}$, $\ce{H_2S}$). Non - living, in some proteins.	No
Phosphorus	Exists as elemental solid, in compounds (e.g., $\ce{PO_4^{3 - }}$). Non - living, in DNA/ATP.	No

Answer:

To fill the table, we analyze each element:

Carbon

• What We Observe: Carbon is a non - living element. It exists as atoms, in compounds like carbon dioxide ($\ce{CO_2}$) or in the structure of organic molecules (but the element itself is not alive). It has properties like forming covalent bonds, being part of the carbon cycle, etc.
• Is It Alive?: No (elements are not alive; life is composed of molecules and cells made of these elements, but the elements themselves lack life characteristics like growth, reproduction, response to stimuli).

Nitrogen

• What We Observe: Nitrogen is a gas (as $\ce{N_2}$ in the atmosphere) or in compounds like ammonia ($\ce{NH_3}$), nitrates ($\ce{NO_3^-}$). It is non - living, involved in the nitrogen cycle (e.g., nitrogen fixation by bacteria, but the element nitrogen is not alive).
• Is It Alive?: No.

Oxygen

• What We Observe: Oxygen is a gas ($\ce{O_2}$) or in compounds like water ($\ce{H_2O}$) or oxides. It is non - living, essential for respiration in living organisms, but the element itself has no life.
• Is It Alive?: No.

Hydrogen

• What We Observe: Hydrogen is a gas ($\ce{H_2}$) or in compounds like water ($\ce{H_2O}$), hydrocarbons. It is non - living, a component of many biological molecules, but the element is not alive.
• Is It Alive?: No.

Sulfur

• What We Observe: Sulfur can be in elemental form (yellow solid) or in compounds like sulfates ($\ce{SO_4^{2 - }}$), hydrogen sulfide ($\ce{H_2S}$). It is non - living, involved in biological processes (e.g., in some proteins), but the element is not alive.
• Is It Alive?: No.

Phosphorus

• What We Observe: Phosphorus can be in elemental form (white or red phosphorus) or in compounds like phosphates ($\ce{PO_4^{3 - }}$). It is non - living, essential for DNA, ATP, etc., in living organisms, but the element is not alive.
• Is It Alive?: No.

Ingredient	What We Observe	Is It Alive?
Nitrogen	Exists as $\ce{N_2}$ gas, in compounds (e.g., $\ce{NH_3}$, $\ce{NO_3^-}$). Non - living, part of nitrogen cycle.	No
Oxygen	Exists as $\ce{O_2}$ gas, in compounds (e.g., $\ce{H_2O}$, oxides). Non - living, used in respiration.	No
Hydrogen	Exists as $\ce{H_2}$ gas, in compounds (e.g., $\ce{H_2O}$, hydrocarbons). Non - living, component of biomolecules.	No
Sulfur	Exists as elemental solid, in compounds (e.g., $\ce{SO_4^{2 - }}$, $\ce{H_2S}$). Non - living, in some proteins.	No
Phosphorus	Exists as elemental solid, in compounds (e.g., $\ce{PO_4^{3 - }}$). Non - living, in DNA/ATP.	No