Practice for Final Exam

Front

What are chemical properties?

Back

Chemical properties are characteristics of a substance that become evident during a chemical reaction. They describe the ability of a substance to undergo changes that transform it into different substances.

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are altered into one or more new and different substances. Examples include rusting, burning, and decomposition.

Front

What is the significance of valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom. They determine how an element reacts chemically with other elements.

Front

What distinguishes metals from nonmetals?

Back

Metals are typically shiny, good conductors of heat and electricity, and malleable, while nonmetals are usually dull, poor conductors, and brittle.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by increasing atomic number, which shows periodic trends in properties.

Front

What are alkali metals?

Back

Alkali metals are the elements in group 1 of the periodic table. They are highly reactive and have one valence electron.

Front

What are noble gases?

Back

Noble gases are the elements in group 18 of the periodic table. They are characterized by their lack of reactivity due to having a full valence shell.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds are formed when electrons are transferred from one atom to another, while covalent bonds are formed when atoms share electrons.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

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; it is conserved.