An atom has atomic number 92 and mass number 238. Which of these is an isotope

of this atom?

a. 235U

92

b. 238Th

91

c. 92Nb

41

d. 92X

235

What type of radiation is likely to occur when the ratio of protons to neutrons is below the band of stability? a. alpha decay b. beta decay c. neutron emission d. positron emission

What happens to wood when it burns?

You have a solution of 75% zinc and 25% iron. Which is the solute and which is the solvent? (SPS6a; DOK2) a. zinc is solute; iron is solvent c. both are solvents b. zinc is solvent; iron is solute d. both are solutes

How does coal convert to electrical energy?

Find the pH of a solution that contains 3.25 g of H2SO4 (MM = 98.08 g/mol) dissolved in 2.75 liters of solution. (Hint diprotic acid)

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.

Compared to a phosphorus atom, a P3 - ion has (1) more electrons and a larger radius (2) more electrons and a smaller radius (3) fewer electrons and a larger radius (4) fewer electrons and a smaller radius

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.