Place the bottle of coke in an open area where spillages can be cleaned easily. Now put two teaspoons full of baking powder in the bottle of coke. Give it a stir. What do you observe? Is it physical or chemical change.
Answers
Answer:
Students are introduced to the concepts of chemical change and physical change in elementary school. These concepts are covered in greater detail as students progress through middle school and high school. A chemical change occurs when substances combine (the reactants) to form new substances (the products) as atoms are rearranged. Common evidences of a chemical change include a change of color, odor, temperature, the formation of a gas, or a precipitate
A physical change occurs when there is a change in physical properties of a substance but not chemical compostion. Common physical changes include melting, change of size, volume, color, density, and crystal form.
The classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change. Students tactually experience the formation of a gas as carbon dioxide fills up the balloon and sense a change of temperature.
Related Vocaulary:
physical change
chemical change
products
reactants
As students complete this activity they will immediately notice the production of the gas. However, it may be necessary to ask the students to observe the temperature of the substance in the bottle after the reaction. It will be colder than before.