In the reaction 2Ca + O2 → 2CaO for every 2 Ca you will need how much O2? a.

1

b.

2

c.

3

d.

4

Scientists and engineers design new technologies to solve problems. often, a new technological design will contain a flaw. which of the following is true about such a flaw? a. it should be studied so that the design can be fixed or a new design can be proposed. b. it means that the problem being investigated cannot be solved. c. it means that the people who proposed the design should not be scientists or engineers. d. it makes the technological design useless.