Parts of the experiment that are controlled by the scientist are called

a. variables

b. hypotheses

c. controls

d. biologicals

A. Variables, this is because you can choose what you're testing

C controls because variables are the things you Canche and you control the control

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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