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Biology

Peter H Raven, George B Johnson

Chapter 2

The Nature of Molecules - all with Video Answers

Educators

Chapter Questions

01:59

Problem 1

An atom of nitrogen has 7 protons and 7 neutrons. What is its atomic number? What is its atomic mass? How many electrons does it have?

Ramesh Singh
Ramesh Singh
Numerade Educator
01:39

Problem 2

How do the isotopes of a single element differ from each other?

Ramesh Singh
Ramesh Singh
Numerade Educator
02:41

Problem 3

The half-life of radium-226 is 1620 years. If a sample of material contains 16 milligrams of ra-dium-226, how much will it contain in 1620 years? How much will it contain in 3240 years? How long will it take for the sample to contain 1 milligram of radium-226?

Mishal Gul
Mishal Gul
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00:38

Problem 4

What is the octet rule, and how does it affect the chemical behavior of atoms?

Devon Burke
Devon Burke
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02:26

Problem 5

What is the difference between an ionic bond and a covalent bond? Give an example of each.

Emily Harris
Emily Harris
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01:38

Problem 6

What types of atoms participate in the formation of hydrogen bonds? How do hydrogen bonds contribute to water's high specific heat?

Parvati Devi
Parvati Devi
Numerade Educator
01:47

Problem 7

What types of molecules are hydrophobic? What types are hydrophilic? Why do these two types of molecules behave differently in water?

Parvati Devi
Parvati Devi
Numerade Educator
01:54

Problem 8

What is the pH of a solution that has a hydrogen ion concentration of $10^{-3}$ mole/liter? Would such a solution be acidic or basic?

Parvati Devi
Parvati Devi
Numerade Educator