Which of the following is an example of physical change?
A) Mixing baking soda and vinegar together, and this causes bubbles and foam. B) A glass cup falls from the counter and shatters on the ground. C) Lighting a piece of paper on fire and the paper bums up and leaves ashes. D) Baking a birthday cake for your mother.
Answers
A glass cup falls from the counter and shatters on the ground is an example of physical change.
B) A glass cup falls from the counter and shatters on the ground.
What are physical and chemical changes?
Physical Change - Physical change is a change in which no new substance is formed that means no changes in properties of substance just the molecules present in the substance might get rearranged.
Chemical Change - Chemical change is a change in which a new substance is formed and now that new substance can have different properties such as a change in the number of molecules, color, odor, etc. from the original one.
Explanation:
A) Mixing baking soda and vinegar together, and causes bubbles and foam.
It is a chemical change because the new substance is formed which is a salt known as sodium acetate along with bubbles and foam and all these are new products and have different properties.
B) A glass cup falls from the counter and shatters on the ground.
It is a physical change because even after the glass falls from the counter and is shattered then those pieces are still of material glass and no new substance formed.
C) Lighting a piece of paper on fire and the paper burns up and leaves ashes.
It is a chemical change because after burning up the paper a new substance is formed which is ashes and both paper and ashes have different properties.
D) Baking a birthday cake for your mother.
It is a chemical change because there are different materials required to make a cake such as flour, eggs, butter, etc., and all when used together helps in making a cake which is a new substance and has different properties.