Semester Review PS-2024

Front

What are compounds?

Back

Compounds are substances formed when two or more elements chemically bond together. Examples include methane (CH₄) and propane (C₃H₈).

Front

How do particles behave in a liquid at higher temperatures?

Back

At higher temperatures, the velocities of the particles in a liquid increase, but the space between them remains the same.

Front

How many electrons does a neutral atom with atomic number 11 have?

Back

A neutral atom with atomic number 11 has 11 electrons.

Front

What do elements in the same group of the periodic table have in common?

Back

Elements in the same group have similar chemical properties and physical properties.

Front

What property allows some elements to conduct electricity under certain conditions?

Back

Some elements can conduct electricity under certain conditions due to their ability to have a complete set of valence electrons.

Front

What is the atomic number?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded, such as air or salad.

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 are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configurations, and recurring chemical properties.