Elements of Living Organisms

Question 1

Check all the characteristics below that describe elements.

Revolt · Accepted Answer

one type of atom; a pure substance

Question 2

Check all the characteristics below that describe compounds.

Revolt · Accepted Answer

two or more elements; chemically combined elements; definite proportions

Question 3

List the six fundamental elements found in living organisms in the text area below.

Revolt · Accepted Answer

carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), sulfur (S)

Question 4

Check the elements you included in your list.

Revolt · Accepted Answer

carbon (C); hydrogen (H); oxygen (O); nitrogen (N); phosphorus (P); sulfur (S)

Question 5

In the box provided explain why living organisms contain more hydrogen atoms than any other atoms, yet 65% of a typical organism’s mass is oxygen.

Revolt · Accepted Answer

Much of an organism’s mass is water. Each water molecule contains two hydrogen atoms and one oxygen atom, so hydrogen atoms are more numerous. But an oxygen atom has about sixteen times the mass of a hydrogen atom, so oxygen makes up a greater share of the organism’s mass.

Question 6

Check your answers by clicking all of the items you included in your explanation.

Revolt · Accepted Answer

A large portion of an organism’s mass is in the form of water.; Water contains two hydrogen atoms and one oxygen atom.; The mass of oxygen is sixteen times that of hydrogen.

Question 7

Beth broke her ankle bone. The doctor gives her a brochure on foods she can eat to help restore the health of her bones. Which element will help Beth strengthen the bone?

Revolt · Accepted Answer

phosphorus

Question 8

Beth recently became a vegetarian. The doctor suggested Beth eat more peas and beans to ensure she gets all of the nutrients she needs. Which element might the doctor be trying to help her get more of?

Revolt · Accepted Answer

nitrogen

Elements of Living Organisms Answers

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