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Unit 1: The Chemical Basis of Life Quiz

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Questions and Answers

What type of energy is associated with the random movement of atoms and molecules?

Electrical energy

Thermal energy (correct)

Chemical energy

Mechanical energy

In what form is water less dense than in its liquid form?

Gas (water vapor)

Plasma

Solid (ice) (correct)

Supercooled liquid

What property of water makes it the universal solvent of life?

High boiling point

Low heat capacity

High surface tension

Ability to dissociate into ions (correct)

What condition is created by dissolved carbon dioxide in seawater that lowers the ocean's pH?

Ocean acidification Signup and view all the answers

How do scientists refer to the search for extraterrestrial life related to water?

Astrobiological research Signup and view all the answers

What is an element?

A substance that cannot be broken down into other substances by chemical means Signup and view all the answers

Which of the following is a trace element?

Fluoride Signup and view all the answers

What is the function of iodine in the human body?

Producing a hormone by the thyroid gland Signup and view all the answers

What are the subatomic particles that make up an atom?

Proton, electron, neutron, nucleus Signup and view all the answers

How many essential elements are needed in humans?

25 Signup and view all the answers

What happens when there is an iodine deficiency in the diet?

It causes the thyroid gland to grow abnormally (goiter) Signup and view all the answers

What does the mass number/atomic mass of an element represent?

Total amount of protons and neutrons Signup and view all the answers

Which statement is true about isotopes?

They have different numbers of protons and neutrons. Signup and view all the answers

In a chemical bond, when one atom strips off an electron from another atom due to electronegativity, what type of bond is formed?

Ionic bond Signup and view all the answers

What is the main role of electrons in chemical activity within an atom?

Participating in chemical reactions Signup and view all the answers

Which type of bond involves attractions between atoms and is weaker compared to covalent or ionic bonds?

Hydrogen bond Signup and view all the answers

What property of water is described as the tendency of water molecules to stick together?

Cohesion Signup and view all the answers