Indicate whether the sentence or statement is true or false.
The types of particles that are located in the nucleus of an atom are protons and neutrons, and the types of particles that are located in the energy levels surrounding the nucleus are electrons.
The atomic number of carbon is 6, so it must contain 12 electrons.
Most elements are stable if their outermost energy level contains an even number of electrons.
Atoms in a gas move more rapidly than atoms in a liquid or a solid do.
The products of an endergonic chemical reaction possess more energy than the reactants from which they are produced.
The amount of energy needed to cause a chemical reaction to start is called activation energy.
When an enzyme binds with its substrate, the activation energy needed for the chemical reaction to occur is raised.
Enzymes speed up a chemical reaction by increasing the activation energy of the reaction.
Free hydrogen ions can react with water molecules and form a positively charged ion, the hydronium ion.
Buffers can neutralize acids, but they do not affect bases.
Identify the letter of the choice that best completes the statement or answers the question.
The smallest particle of matter that can retain the chemical properties of carbon is
The bond formed when two atoms share a pair of electrons is called a
Sharing of electrons in the outer energy levels of two atoms
An atom that has gained or lost electrons is called a(n)
Which of the following statements most accurately describes the difference between an ionic bond and a covalent bond?
A reaction in which the products have less energy than the reactants is
Refer to the graph above. Reaction “1” in the graph
Refer to the graph above. Which of these statements is true regarding the graph?
Changing the course or pathway of a chemical reaction so that it requires less activation energy
Oxidation-reduction reactions are important in organisms because they