ChemCom Semester 1 Final 24/25

Front

Which EM waves have the longest wavelength?

Back

Radio waves have the longest wavelength in the electromagnetic spectrum.

Front

What does the number 3 represent in 4NH3?

Back

The number 3 is a subscript indicating there are three hydrogen atoms in the ammonia molecule.

Front

What law governs the balancing of chemical equations?

Back

The Law of Conservation of Matter/Mass states that matter cannot be created or destroyed in a chemical reaction.

Front

What kind of radiation is used for X-Rays?

Back

X-Rays use ionizing radiation, which has enough energy to remove tightly bound electrons from atoms.

Front

What is Half-life?

Back

Half-life is the amount of time it takes for half the nuclei in a sample of a radioactive isotope to decay.

Front

What is the electromagnetic spectrum?

Back

The electromagnetic spectrum is the range of all types of EM radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

Front

Define ionizing radiation.

Back

Ionizing radiation is radiation that carries enough energy to liberate electrons from atoms or molecules, thereby ionizing them.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Front

What is a coefficient in a chemical formula?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved.

Front

Explain the concept of conservation of mass in a chemical reaction.

Back

The conservation of mass states that the total mass of reactants equals the total mass of products in a chemical reaction.