Chemistry Semester 1 Review

Front

What is a pure substance?

Back

A pure substance is matter that consists of matter with a composition that is fixed in a definite proportion at all times.

Front

How many electrons can the d sublevel hold?

Back

The d sublevel can hold 10 electrons.

Front

What type of change does this image represent: physical or chemical?

Back

Chemical change.

Front

What is ionization energy?

Back

Ionization energy is how much energy it takes to remove an electron from an atom.

Front

In which state of matter do particles spread apart and fill all the space available to them?

Back

Gas.

Front

What are the three main states of matter?

Back

Solid, liquid, gas.

Front

Define the term 'element'.

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the atomic number of an element?

Back

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