Question

1. a student burns 10g of paper in a closed system and collects the ash, gases, and other by - products. the total mass after burning is 10g. explain how this supports the law.
2. define and differentiate between and give an example for each.

a) homogeneous mixture
b) heterogeneous mixture

Explanation:

Question 3

The law of conservation of mass states that in a closed - system, mass is neither created nor destroyed during a chemical or physical change. Here, the initial mass of the paper is 10g. After burning in a closed system, the total mass of the ash, gases, and by - products is also 10g. This shows that the total mass before and after the burning (a chemical reaction) remains the same, thus supporting the law of conservation of mass.

a) A homogeneous mixture is a mixture in which the composition is uniform throughout. The components are evenly distributed at a molecular or ionic level. For example, saltwater is a homogeneous mixture. When salt (sodium chloride) is dissolved in water, the salt ions are evenly dispersed throughout the water, and every part of the saltwater has the same salt - to - water ratio.
b) A heterogeneous mixture is a mixture in which the composition is not uniform. Different components can be visually distinguished or separated easily. For example, a mixture of sand and water is heterogeneous. The sand particles do not dissolve in water and can be seen as separate entities in the water, and they will settle to the bottom over time.

Answer:

The law of conservation of mass is supported because the initial mass of the paper (10g) equals the total mass of the products (ash, gases, and by - products) after burning in a closed system, indicating that mass is conserved during the chemical reaction of burning.

Question 4