Chemistry Final Exam

Front

What are the coefficients when the equation Fe2O3 + ___CO → ___Fe + ___CO2 is correctly balanced?

Back

2, 6, 4, 3

Front

What is the relationship between heat energy and temperature?

Back

As heat energy decreases and temperature remains constant, condensation occurs.

Front

Which atom has a Lewis dot notation showing six valence electrons?

Back

Sulfur

Front

Why do ionic compounds have higher melting points than molecular compounds?

Back

Attractive forces between ions are stronger than the attractive forces between molecules.

Front

What is the electron configuration for sulfur?

Back

1s2 2s2 2p6 3s2 3p4

Front

Define ionic bond.

Back

An ionic bond is a chemical bond formed between two ions with opposite charges.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

Front

Explain the concept of 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 octet rule in chemistry?

Back

The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving stability.

Front

What is the difference between an endothermic and exothermic reaction?

Back

An endothermic reaction absorbs heat, while an exothermic reaction releases heat.