The electromagnetic waves that have the lowest frequencies are called

a. radio waves.

c. ultraviolet waves.

b. microwaves.

d. x-rays.

The fertilizer ammonium sulfate, (nh4) 2so4, is prepared by the reaction between ammonia (nh3) and sulfuric acid: 2nh3 (g) + h2so4 (aq) ? (nh4) 2so4 (aq) how many kilograms of nh3 are needed to produce 3.60 * 105 kg of (nh4) 2so4?

The two ends of a solenoid act like a. electrons. b. a compass needle. c. a circuit. d. poles.

Chemical equation for heat of formation of c25h52

C. in the reaction of copper and silver nitrate, a new substance appeared in the test tube. describe the physical appearance of the substance and identify its chemical formula

A reaction which needs to gives off energy to complete the chemical reactions is called an A) adiabatic reaction. B) oxidation reaction. C) exothermic reaction. D) endothermic reaction.

Why does soda fizz when you poor it into a cup?

Which of the following does NOT describe acute exposure to hazardous materials? A. Determination of exposure is almost always after the fact. B. Long time period between exposure to an agent and the onset of symptoms. C.

Select the correct answer. In the graph, what effect would adding a catalyst have on D? A. It would decrease. B. It would increase. C. It would stay the same. D. You cannot tell from this graph.

Estimate the heat of neutralization of H3PO4 in kJ/mol given these dаta: Heat transferred = 2.5 x 102 J Moles of H3PO4 = 1.4 x 10-3 mol Moles of NaOH = 5.0 x 10-3 mol

Consider the elemts Ca, Ba, As, and Bi. Which has the ... largest radius? highest electronegativtity? Highest Ionization Energy?