The characteristc bright line spectrum of an atom is produced by

1. Electrons absorbing quanta

2. Electrons emitting quanta

3. Protons absorbing quanta

4. Protons emitting quanta

Select the ion. -NO 2 -H2SO4 -AI + 3

Sensitivity analysis is concerned with how certain changes affect a. the feasible solution. b. the degenerative solution. c. the optimal solution. d. the unconstrained solution.

The atomic mass of an element is the sum of neutrons and

Which of these is an example of a physical change! A baking a cake B toasting bread C grinding pepper D lighting up a grill

In order to get a reaction started the reactants of this type of reaction require the greatest amount of energy: a. fusion b. fission c. physical d. chemical

While in Europe, if you drive 107km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 39.0mi/gal? Assume that 1euro=1.26dollars.

During an experiment, a student spilt 1.0 mL of concentrated H2SO4. The student neutralized the acid with 3.05 g of NaHCO3. What is the concentration of H2SO4?

Which statment about hydrogen bonds is true

Which of the following substances is NOT an alloy? a. Brass b. Bronze c. Stainless steel d. Tin

Relate the statement:"you cant get something for nothing" to the law of the conservation of mass