Which of these is an example of a physical change -baking a cake -toasting bread -grinding pepper -lighting up a grill

Your best choice would be grinding pepper

Grinding paper because a physical change is where it’s still the same subsctance, not a chemical because chemical is when it changes into a new substance like toasting bread, the burnt parts are a new substance, it changes it. But grinding pepper isn’t changing the substance it’s just making it into little pieces

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

Ibelieve y y even though i've only taken chemistry for one year