Question

the nature of matter

1. which is an example of a chemical change?

a. burning wood
b. freezing water
c. bending a paper clip

1. every chemical or physical change in matter includes a change in

a. weight.
b. mass.
c. energy.

1. which of the following is an example of a change of state?

a. pouring chocolate syrup over ice cream
b. melting ice in a glass of lemonade
c. stretching copper into a wire
completion
read each word in the box. in each sentence below, fill in one of the w not all of the words will be used.

Explanation:

1. Burning wood is a chemical change as it involves a reaction with oxygen to form new substances like carbon - dioxide and ash. Freezing water is a physical change (change of state), and bending a paper clip is a physical deformation without changing the substance's chemical composition.
2. Every chemical or physical change in matter involves a change in energy. According to the law of conservation of mass and energy, mass and weight don't always change in every such change.
3. Melting ice is a change of state from solid to liquid. Pouring chocolate syrup over ice - cream is a physical mixture, and stretching copper into a wire is a physical deformation of the metal.

Answer:

1. a. burning wood
2. c. energy
3. b. melting ice in a glass of lemonade