HC Sem Exam Review

Front

What is the name for SiCl4?

Back

silicon tetrachloride

Front

Which statement is true about elements?

Back

Elements contain only one kind of atom.

Front

What does one mole represent in terms of Avogadro's number?

Back

6.022 × 10²³ units

Front

Which group of elements is extremely stable and unreactive?

Back

Noble Gases

Front

For an endothermic process, q is reported with a ___________ sign, and for an exothermic process, q is reported with a ___________ sign.

Back

positive; negative

Front

What is the definition of an element?

Back

A substance that cannot be broken down into simpler substances by chemical means.

Front

What is Avogadro's number?

Back

6.022 × 10²³, the number of atoms, molecules, or particles in one mole.

Front

What are noble gases?

Back

Elements in Group 18 of the periodic table that are known for their lack of reactivity.

Front

What is the difference between an endothermic and exothermic reaction?

Back

Endothermic reactions absorb heat, while exothermic reactions release heat.

Front

What is a chemical compound?

Back

A substance formed when two or more elements are chemically bonded together.