What is matter?
Anything that occupies space and has mass.
What is an element?
A unique form of matter with specific chemical and physical properties that cannot be broken down into smaller substances.
What is the smallest unit that retains an element’s chemical properties?
An atom.
Where are protons and neutrons located in an atom?
In the central nucleus.
In a neutral atom, how does the electron count relate to protons?
It equals the number of protons and the atomic number.
What do chemical reactions change between atoms, and what do they convert?
They change electron distribution and convert reactants into products.
What happens to reactants in an irreversible reaction?
They are used up as the reaction proceeds in one direction.
What proportion of the human body is made up of water?
About 60–70%.
What causes ice to float on liquid water?
Ice is less dense than liquid water.
How does the Bohr model represent electrons around the nucleus?
In circular orbits at specific distances from the nucleus.
Answer 11 questions on Chemical Foundations of Life.
1. Which description defines matter?
2. Which set lists the four most common elements in living organisms?
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