Joshua observed the changes in a cake when it was baked in a oven. What best explains that he observed a chemical change? A. He saw the rising batter from the cake in oven.
B. He saw the cake expand outside the rim of the baking dish
C. He noticed the flour and other ingredients lose their unique properties.
D. He noticed the steam from the moisture rise in the oven.

The clouds are grey and ground is wet. a quantitative b qualitative

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next