112 Identifying Types of Reactions: For each reaction shown, determine whether it is a synthesis, decomposition, combustion, single replacement, or double replacement (precipitation) reaction. Then balance the equation.

___Cu(aq) + ___S ___Cu2S(s)
___Li +___O2 ___Li2O
___C8H18 + ___O2___CO2+ ___H2O
Pb(NO3)2+ __KI ___PbI2 + ___KNO3
___Al + ___ZnCl2 ___Zn + ___AlCl3
___Zr + ___N2 ___ZrN4
___C4H10+ ___O2___CO2+ ___H2O
___NaCl + F2 → NaF + Cl2
___BaCl2 + ___KF ___KCl + __BaF2
___CdO ___Cd + ___O2
___CsCl ___Cs + ___Cl2

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

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