Which of the following corresponds to an alpha particle? A. A hydrogen nucleus, with an atomic number of 1 and an atomic
mass of 1
B. A helium nucleus, with an atomic number of 2 and an atomic
mass of 4
C. A helium nucleus, with an atomic number of 2 and an atomic
mass of 2
D. A helium nucleus, with an atomic number of 1 and an atomic mass
of 2

What is the formula for the compound dinitrogen pentoxide? a. n4o5 b. n5o4 c. n4o6 d. n5o2 e. n2o5

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy