BM Review: Chemistry 1

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include cooking, rusting, and burning.

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. This means that matter is neither created nor destroyed.

Front

How many atoms of oxygen are in the chemical formula H2SO4?

Back

There are 4 oxygen atoms in the chemical formula H2SO4.

Front

What does the chemical formula H2SO4 represent?

Back

H2SO4 represents sulfuric acid, which contains 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Front

What is an example of a physical change?

Back

Examples of physical changes include melting ice, crumpling paper, and dissolving sugar in water.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include rusting iron, cooking an egg, and burning wood.

Front

What happens to the atoms during a chemical reaction?

Back

During a chemical reaction, atoms are rearranged to form new substances, but the total number of atoms remains the same.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is followed, meaning the number of atoms of each element is the same on both sides of the equation.

Front

What is rust?

Back

Rust is a chemical compound formed when iron reacts with oxygen and moisture, resulting in iron oxide.