AP Chemistry Midterm Review

Front

What is the Lewis dot structure for Selenium?

Back

The Lewis dot structure for Selenium (Se) shows the element symbol surrounded by six dots, representing its six valence electrons.

Front

What is a Physical Change?

Back

A Physical Change is a change that alters the physical properties of a substance without changing its composition.

Front

How many significant figures are in the number 350.540?

Back

There are 6 significant figures in the number 350.540.

Front

What type of change occurs when Iron rusts?

Back

Iron rusts undergoes a Chemical Change.

Front

What is true about the equation H2O2 (l) → H2O (g) + O2 (g)?

Back

Water vapor (H2O) is a product of the reaction.

Front

Define a Chemical Change.

Back

A Chemical Change is a process that involves the transformation of one or more substances into different 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 difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the significance of the mole in chemistry?

Back

The mole is a unit that measures the amount of substance, allowing chemists to count particles by weighing them.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.