Chemical Changes in Matter

A chemical change is a change that forms a new type of matter. A chemical property is a feature of matter that can cause a chemical change.

A different type of matter forms during a chemical change. Log- Ash Apple- Rotting Apple Shiny Silver- Tarnished Silver New Bike- Rusted Bike

Evidence of a Chemical Change Some Clues of Chemical Change Changing color (food rots, metal rusts or tarnishes) Having an unusual smell Changing texture Becoming more or less acidic Getting hot or cold without being heated or cooled Bubbles forming because a gas is givem off

Examples of chemical changes: Cooking an egg Chewing a cracker Burning a candle Rotting tomatoes Can you think of any more?

Which of the following is a chemical change? Boiling water Cutting paper Melting ice Rusting iron

Which of the following is a clue that a chemical change has occurred? A beaker become cold when you mix two liquids into it. A liquid forms bubbles when it reaches a high temperature Water changes color when you add food coloring to it. A car door feels hot when you touch it in a summer afternoon.

What can you do to wood to cause a chemical change? Break it Burn it Cut it Saw it

The table lists a scientist’s observation when she stirs different substances together. Which tests show that a chemical change has taken place? 1 and 3 1 and 4 2 and 4 2 and 3 Test Results 1 Dissolved 2 Increased temperature 3 Formed a clear liquid 4 Had a bad smell

Mrs. Spon pours vinegar over baking soda Mrs. Spon pours vinegar over baking soda. At first, many bubbles form, but then they slowly stop forming. What is the BEST clue that this is a chemical change and not a physical change? The bubbles stop forming There were many bubbles The baking soda did not form bubbles by itself The bubbles did not form because a liquid was heated.

Which of the following is a chemical change?