Chemistry Fall Exam Review

Front

What is a balanced chemical reaction?

Back

A balanced chemical reaction has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What generally happens to electronegativity as you move from left to right across the periodic table?

Back

Electronegativity generally increases as you move from left to right across the periodic table.

Front

How many valence electrons does an element with the electron configuration 1s²2s²2p⁶3s²3p⁵ have?

Back

7 valence electrons.

Front

What does precision in measurements refer to?

Back

Precision refers to how close measurements are to each other.

Front

Why is JJ Thomson's model of the atom not a good choice for a modern representation?

Back

It does not show the nucleus in the center of an atom and does not depict electrons in their orbitals.

Front

What is the definition of atomic radius?

Back

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

What trend is observed in atomic radius as you move down a group in the periodic table?

Back

Atomic radius generally increases as you move down a group in the periodic table.

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measurement is to the true value, while precision refers to how close measurements are to each other.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are the electrons in the outermost shell of an atom and are involved in forming chemical bonds.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.