Changes to Matter

Do Now Answer this question in your notebook Do you think melting chocolate is a physical change or a chemical change? Explain your reasoning

Demos Describe what occurs in each demonstration: Then, classify each as a physical or chemical change.

Demos Ripping paper Crumbling aluminum foil Adding salt to water Combining baking soda and vinegar Burning paper Combining Potassium iodide solution and Lead nitrate solution (Video) Combining sodium and water

Physical Change A physical change is a change that alters the form or appearance of a substance, but does not change the identity of the substance A substance that undergoes a physical change is still the SAME substance after the change – it still has the same properties Ex/ change of state (melting, freezing, etc.), change in shape or form, dissolving

Chemical Changes A chemical change results in a new substance (or new substances) being produced - as a result of a chemical reaction. The new substance(s) will have different properties compared to the original substance Ex/ Iron rusting – (rust is a new substance)

Classwork List at least three physical changes that can happen to butter. Why are they physical changes? List at least one chemical and one physical change that can happen to sugar. Explain why each change is physical or chemical.

Homework Complete a four square vocabulary box for: Physical change Chemical change