29. What is E for a system which has the following two steps: Step 1: The system absorbs 60 J of heat while 40 J of work are
performed on it.
Step 2: The system releases 30 J of heat while doing 70 J of work.
C. 90 J
A. 110J
B. 100 J
D. Zero

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.