Chemistry 1st Semester Final Exam Review

Front

What is the definition of an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How do you calculate the mass number of an element?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus of an atom.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, indicating the ability of a substance to change into another substance.

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity.

Front

How many protons are in an atom of copper (Cu)?

Back

Copper has 29 protons.

Front

What is the relationship between protons and the identity of an element?

Back

The number of protons in an atom determines the element's identity and its position on the periodic table.

Front

What is the mass number of an element with 11 protons and 12 neutrons?

Back

The mass number is 23.

Front

What are the two main types of properties in chemistry?

Back

The two main types of properties are physical properties and chemical properties.

Front

What is the significance of mass percentage in chemistry?

Back

Mass percentage is used to express the concentration of a component in a mixture or compound, calculated as (mass of component / total mass) x 100.

Front

What distinguishes isotopes of the same element?

Back

Isotopes of the same element differ in the number of neutrons, which affects their mass but not their chemical properties.