What is an atom?
The chemically indivisible smallest particle of a substance.
What are the components of a molecule?
Atoms joined by chemical bonds.
What remains the same in molecules of a given substance?
The kinds and numbers of atoms.
What defines an element?
A substance consisting of only one kind of atom.
How many naturally occurring elements have scientists identified?
92.
What defines a chemical compound?
A substance made from atoms of different elements.
Which particles are associated with an atom in the diagram?
Electrons, protons, and neutrons.
What does the diagram identify as an atom’s central structure?
The nucleus.
How many oxygen atoms are bonded in an oxygen molecule?
Two oxygen atoms.
Why do different elements have distinct chemical and physical properties?
They consist of different kinds of atoms.
Which elements make up table salt?
Sodium and chlorine.
Which elements make up sugar?
Carbon, hydrogen, and oxygen.
Which elements make up chalk?
Calcium, carbon, and oxygen.
Answer 6 questions on Chemical Composition of the Cell.
1. Regarding the smallest particles of substances, which statements are correct?
2. A particle consists of several atoms joined together by chemical bonds. Which statements describe molecules correctly?
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