Chemistry Semester 1 Review

Front

What is a constant in an experiment?

Back

A constant is a factor that remains unchanged throughout an experiment, allowing for a fair test of the independent variable.

Front

What type of change occurs when a banana turns brown?

Back

A chemical change, as it involves a transformation in the substance's chemical structure.

Front

What is an independent variable?

Back

The independent variable is the factor that is changed or manipulated by the scientist in an experiment.

Front

What does 'Li' represent in the periodic table?

Back

'Li' is the chemical symbol for the element Lithium.

Front

Which group of elements does not react?

Back

The noble gases are the group of elements that do not react under normal conditions.

Front

What is a dependent variable?

Back

The dependent variable is the factor that is measured or observed in an experiment, which changes in response to the independent variable.

Front

Define a chemical reaction.

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

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 are alkali metals?

Back

Alkali metals are a group of elements in Group 1 of the periodic table, known for being highly reactive.

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.