FIRST LET’S REVIEW : Physical and Chemical Changes Physical Change Chemical Change O Doesn’t create a new substance O Changes the form or shape O Phase changes are physical changes Solid → liquid → gas Gas → liquid → solid Solid → gas O Change in matter which creates a new substance O How can I tell if a chemical change has occurred? O A gas is produced (bubbles) O A change in color O A change in temperature

Is the formation of rust a physical or chemical change? CHEMICAL

Is evaporation of water a physical or chemical change? PHYSICAL

Is tearing paper in strips a physical or chemical change? PHYSICAL

Are exploding firecrackers a physical or chemical change? CHEMICAL

Is burning a match a physical or chemical change? CHEMICAL

Which is an example of a chemical change? 1. a balloon that is blown up. 2. Ice melting. 3. paper burning 4. a metal pan heating on the stove.

Which is an example of a physical change? 1. Metal rusting. 2. Silver tarnishing. 3. Water boiling. 4. Paper burning.

Which of the following is an example of a physical change? 1. Mixing baking soda and vinegar together, and this causes bubbles and foam. 2. A glass cup falls from the counter and shatters on the ground. 3. Lighting a piece of paper on fire and the paper burns up and leaves ashes. 4. Baking a birthday cake for your mother

Which of the following is an example of a chemical change? 1. Filling up a balloon with hot air. 2. Taking a glass of water and freezing it by placing it in the freezer. 3. A plant collecting sunlight and turning it into food. 4. Your dog ripping up your homework.