Unit 1 review (25-26)

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties, often indicated by signs such as gas production, temperature change, or color change.

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, such as melting, freezing, or dissolving.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as reactivity with acids or flammability.

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity, such as color, mass, and boiling point.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes gas production, temperature changes, formation of a precipitate, and color changes.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals, often exhibiting characteristics such as semiconductivity.

Front

Where are metalloids located on the periodic table?

Back

Metalloids are typically found along the zig-zag line that divides metals and nonmetals on the periodic table.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties, allowing for predictions about element behavior.

Front

What happens when vinegar is added to baking soda?

Back

When vinegar (an acid) is added to baking soda (a base), a chemical reaction occurs, producing carbon dioxide gas, which creates bubbles.

Front

What is a semiconductor?

Back

A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator, often used in electronic devices.