Chemistry 1st Semester Review 2024

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing its identity, such as boiling point, color, or density.

Front

What is a homogenous mixture?

Back

A mixture that has a uniform composition throughout, such as saltwater or apple juice.

Front

How do you calculate the number of moles from grams?

Back

Use the formula: Moles = Mass (g) / Molar Mass (g/mol). For calcium, the molar mass is approximately 40.08 g/mol.

Front

Which alkali metal is the most reactive in water?

Back

Cesium (Cs) is the most reactive alkali metal in water.

Front

What does it mean for a compound to have a neutral charge?

Back

The overall charge of the compound must equal zero, meaning the positive and negative charges balance each other out.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to change into different substances, such as reactivity with acids or flammability.

Front

What is a heterogeneous mixture?

Back

A mixture that does not have a uniform composition and can be separated into its components, such as salad or sand and gravel.

Front

What is the molar mass of calcium (Ca)?

Back

The molar mass of calcium is approximately 40.08 g/mol.

Front

What is the reactivity trend of alkali metals in water?

Back

Reactivity increases as you move down the group in the periodic table, with lithium being the least reactive and cesium being the most.

Front

What is the formula for calculating the charge of an ion in a compound?

Back

The charge of an ion can be calculated by balancing the total positive and negative charges in the compound.