PLEASE HELP!! I GIVE BRAINLIEST 1)Which process represents chemical change?
A. A lake freezes over into ice.
B. A metal bar is rolled into a flat sheet.
C. Vinegar bubbles when baking soda is added. D. Sand, water, and salt combine to form a mixture.
2)Which process is an example of a physical change?
A. Carrots are cut into small pieces and mixed into a salad.
B. A peanut butter sandwich is eaten and broken down by enzymes in the stomach.
C Sodium metal and chlorine gas are combined to form sodium chloride, or table salt.
D. Sodium metal and water are combined to form a basic compound and a flammable gas.
3) Which of the following is a chemical change?
A. Water boiling
B. Paper being cut
C. Ice melting
D. rusting
4) Which of these is a clue that a chemical change has occurred?
A. A beaker suddenly becomes very warm when you mix two room-temperature it.
B. A liquid forms bubbles when it reaches a high temperature.
C. Water changes color when you add food coloring to it.
D. Sugar crystals disappear when dissolved in water.
5) To cause a chemical change in wood, you can ...
A. Break it.
B. Burn it.
C. Cut it.
D. Saw it.
6) Which of the following is not a good indication that a chemical change has occurred?
A. The formation of gases
B. A change in color
C. A scratched surface
D. The release heat or light