2024 Chem Sem 1 Part 2 no quantum, history

Front

What is the atomic model that represents an element?

Back

Model 2 is the atomic model that shows an element.

Front

Convert 450,000 to scientific notation.

Back

4.5 x 10^5

Front

What happens when an electron drops from a higher to a lower energy level?

Back

The emission of light occurs from the atom.

Front

What is salt water classified as?

Back

A mixture.

Front

Which wave has a greater frequency, A or B?

Back

Wave A has a greater frequency.

Front

Define a mixture in chemistry.

Back

A mixture is a combination of two or more substances that retain their individual properties.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is scientific notation?

Back

A way of expressing numbers that are too large or too small to be conveniently written in decimal form.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in an atom and determines the element's identity.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.