Supportive Education Service - Science 8

Who conceived the idea that matter was made up of tiny, indivisible atoms?

• Dalton

• Democritus

• Aristotle

• Newton

What is the term for the process where heat is released by a substance?

• Endothermic

• Exothermic

• Isotopic

• Anisotropic

If you were to create a polyatomic ion, how many atoms would it be formed from?

• One

• Two

• Three or more

• None of the above

What is the charge of a proton?

• Negative

• Positive

• Neutral

• None of the above

What is the charge of an anion?

• Positive

• Negative

• Neutral

• None of the above

What is the basic unit of matter?

• Molecule

• Element

• Compound

• Atom

What is a cation?

• A positively charged ion

• A negatively charged ion

• A neutral ion

• None of the above

What happens when an atom loses electrons?

• It forms a negatively charged ion

• It forms a positively charged ion

• It remains neutral

• It forms a neutron

What are molecules?

• Aggregates of at least two atoms held together by a chemical bond in a definite arrangement

• Single atoms that are not combined with any other atoms

• Substances that contain only one type of atom

• Substances that contain different types of atoms combined in complex ratios

What does the atomic number of an atom represent?

• The number of neutrons

• The number of electrons

• The number of protons

• The sum of protons and neutrons