Question

For each statement, answer with YES if evidence of a chemical reaction is present. Answer NO if there is no evidence of a chemical reaction. Green leaves turn yellow and red as the seasons change?

1) YES
2) NO

Answer 1

The color change in leaves from green to yellow and red during the seasons is evidence of a chemical reaction, as chlorophyll production decreases and other pigments become visible.

Step-by-step explanation:

Is the color change in leaves evidence of a chemical reaction?

When green leaves turn yellow and red as the seasons change, it is yes, indicative of a chemical reaction. This change happens because leaves produce less chlorophyll in response to shorter days and cooler temperatures, allowing other pigments like carotenes and anthocyanins to become visible. The reduction of chlorophyll and the visibility of other pigments are evidence of the chemical changes occurring in the leaves.

Does each statement represent a physical property or a chemical property?

a. A pile of leaves slowly rots in the backyard. - Chemical Property

b. In the presence of oxygen, hydrogen can interact to make water. - Chemical Property

c. Gold can be stretched into very thin wires. - Physical Property

Does each statement represent a physical change or a chemical change?

a. Water boils and becomes steam. - Physical Change

b. Food is converted into usable form by the digestive system. - Chemical Change

c. The alcohol in many thermometers freezes at about -40 degrees Fahrenheit. - Physical Change