Question

which of the following changes demonstrates a chemical property? 10 points substance breaks in half substance combusts hammer bounces off substance substance floats in water which of the following is a solution? 10 points salt water macaroni and cheese cake mix vegetable soup the abilities to dissolve in water and to conduct electricity are examples * 10 points of natural properties chemical properties natural laws of matter physical properties

Explanation:

1. A chemical property is observed when a substance undergoes a chemical change. Combustion is a chemical reaction where a substance reacts with oxygen to produce heat and light, changing its chemical composition. Breaking in half, a hammer bouncing off, and floating in water are physical changes that don't alter the substance's chemical identity.
2. A solution is a homogeneous mixture where one substance (solute) is dissolved in another (solvent). Salt water is a solution as salt (solute) dissolves in water (solvent). Macaroni and cheese, cake mix, and vegetable soup are heterogeneous mixtures.
3. The ability to dissolve in water (solubility) and conduct electricity (electrical conductivity) are physical properties. Physical properties can be observed or measured without changing the substance's chemical composition.

Answer:

1. substance combusts
2. salt water
3. physical properties