Question

11 multiple choice 1 point which of the following is an example of a physical change? water freezing into ice a piece of wood burning a toy car rusting zinc producing hydrogen gas when mixed with water 12 multiple choice 1 point what type of change has occurred when a nail rusts? a physical change a chemical change an atomic change a reactive change

Explanation:

1. For the first question, a physical change is a change in the physical state or appearance of a substance without changing its chemical composition. Water freezing into ice is a change of state from liquid to solid, and the water molecules remain the same chemically. Wood - burning is a combustion reaction, rusting is an oxidation reaction, and zinc producing hydrogen gas is a chemical reaction, all of which involve the formation of new substances.
2. For the second question, when a nail rusts, iron in the nail reacts with oxygen and water in the air to form iron oxide (rust). This is a chemical change as a new substance (iron oxide) is formed.

Answer:

1. Water freezing into ice
2. A chemical change