Chemical vs physical reactions

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.

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

Front

Give an example of a chemical change.

Back

Baking a cake is an example of a chemical change, as the ingredients undergo a chemical reaction to form a new product.

Front

Give an example of a physical change.

Back

Water freezing into ice is an example of a physical change, as the water's state changes but its chemical composition remains the same.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

Front

What is the difference between endothermic and exothermic reactions?

Back

Endothermic reactions absorb energy from their surroundings, while exothermic reactions release energy.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What is the role of baking soda in a chemical reaction with vinegar?

Back

Baking soda reacts with vinegar to produce carbon dioxide gas, which is an example of a chemical change.

Front

What is the significance of the law of conservation of mass in chemical reactions?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.