What defines matter?
Anything that occupies space and has mass.
Which four elements are most common in living organisms?
Carbon, oxygen, hydrogen, and nitrogen.
What does an element’s atomic number identify?
Its number of protons.
What does atomic mass approximately equal, in amu?
The number of protons plus neutrons.
In a neutral atom, how does the proton count relate to its electron count?
They are equal.
What does a chemical reaction change between atoms?
The distribution of electrons.
What are reactants in a chemical reaction?
Substances used at the beginning.
Which atom attracts shared electrons more strongly in a water molecule?
Oxygen.
What interaction links slightly positive hydrogen to an electronegative atom in another molecule?
A hydrogen bond.
What does the Bohr model place at specific distances from the nucleus?
Electrons in circular orbits.
Answer 11 questions on Chemical Foundations of Life.
1. Which description best defines an atom?
2. Which arrangement describes the basic structure of an atom?
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