| A | B |
|---|
| What kind of reaction / change occurs when you activate an instant cold pack, which mixes water with a chemical, causing the pack to become very cold? | endothermic reaction |
| What is a subscript? | The small number written to the lower right of an element |
| What is the coefficient? | The whole number written before a compound |
| What is endorthermic? | A reaction where energy is taken IN (the product is colder) |
| What is exothermic? | A reaction that gives OUT energy (or heat) |
| What are reactants? | The substances present BEFORE the reaction occurs (left side of the arrow) |
| What are products? | The substances present AFTER the reaction has taken place (right side of arrow) |
| What is a physical change? | A change where the substance DOES NOT change. |
| What is a chemical change? | Change that DOES produce a new substance with new properties. |
| When vinegar & soda react, is it a physical or a chemical change? | chemical (if they "react" it is chemical) |
| When a log of fire is burning in the fireplace, is this a physical or chemical change? | chemical ("burning" means there is a chemical change) |
| When you dissolve sugar in water, is this a physical or chemical change? | physical ("dissolves" means it changes state) |
| When a snowman melts into a puddle, would this be a physical or chemical change? | physical ("melting" is a change of state) |
| When hydrogen and oxygen react to form water, is this a physical or chemical change? | chemical ("react" means there is a chemical change) |
