Chem Fall Final

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling) and changes in shape or size.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves the breaking and forming of bonds between atoms. Examples include combustion, rusting, and digestion.

Front

What happens to water at 100°C?

Back

At 100°C, liquid water undergoes a physical change and turns into vapor (steam). This process is called evaporation.

Front

How does an Aluminium atom become more stable?

Back

An Aluminium atom becomes more stable by losing 3 electrons, which allows it to achieve a full outer electron shell.

Front

What is the atomic number of an element?

Back

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

Front

What is the chemical formula for Tetrasulfur pentoxide?

Back

The chemical formula for Tetrasulfur pentoxide is S4O5.

Front

What is ionization energy?

Back

Ionization energy is the energy required to remove an electron from an atom or ion in its gaseous state. It is an indicator of how easily an atom can lose an electron.

Front

What is the trend in ionization energy across a period?

Back

Ionization energy generally increases across a period from left to right due to increasing nuclear charge, which holds the electrons more tightly.

Front

What is the trend in ionization energy down a group?

Back

Ionization energy generally decreases down a group because the outer electrons are farther from the nucleus and are shielded by inner electrons.

Front

What is the significance of protons in an atom?

Back

Protons determine the atomic number and identity of an element. They also contribute to the positive charge of the nucleus.