Endothermic and exothermic chemical reactions will be addressed in Chapter 6, Lesson 7. What is the catalyst in this activity? A substance in yeast. What evidence do you have that hydrogen peroxide ...

Making fresh bread at home is becoming quite the trend lately, but today we will be using yeast to make elephant toothpaste! We will learn what a catalyst is and what it does in a decomposition ...

In fact many brewers won't use a system like the Catalyst because it is made of plastic and not glass. Plastic can scratch easily, they reckon, you can introduce dormant bacteria and yeast into a ...