Unit 2 Changes in Matter

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing), shape, or size.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the molecular structure of the substance.

Front

What is an ionic compound?

Back

An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. They typically form between metals and nonmetals.

Front

What is covalent bonding?

Back

Covalent bonding is a type of chemical bond where two atoms share one or more pairs of electrons. This typically occurs between nonmetals.

Front

What ion does lithium form?

Back

Lithium forms a Li+ ion, which means it loses one electron to achieve a stable electron configuration.

Front

How many hydrogen atoms are in glucose (C6H12O6)?

Back

There are 12 hydrogen atoms in a glucose molecule.

Front

What is the difference between a physical and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

Front

What are the properties of ionic compounds?

Back

Ionic compounds typically have high melting and boiling points, are soluble in water, and conduct electricity when dissolved in water or molten.

Front

What are the properties of covalent compounds?

Back

Covalent compounds usually have lower melting and boiling points compared to ionic compounds, may not conduct electricity, and can be gases, liquids, or solids at room temperature.