PS Semester 1 Final Exam

Front

What is a coefficient in a chemical equation?

Back

A coefficient is the number that appears before a formula in a chemical equation, indicating the number of molecules or moles of that substance involved in the reaction.

Front

What does viscosity refer to in liquids?

Back

Viscosity is the tendency of a liquid to keep from flowing, essentially measuring its resistance to flow.

Front

What is nuclear radiation?

Back

Nuclear radiation refers to charged particles and energy that are emitted from the nuclei of radioisotopes.

Front

What type of bond is formed between two nonmetals?

Back

A covalent bond is formed between two nonmetals, where they share electrons.

Front

What type of chemical reaction is represented by A + B -> AB?

Back

This represents a synthesis reaction, where two or more reactants combine to form a single product.

Front

Define atomic number.

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

Explain what a subscript indicates in a chemical formula.

Back

A subscript indicates the number of atoms of an element in a molecule; for example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.