Ahydrocarbon consists of four carbon atoms with one double bond. predict the molecular formula of this compound.

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

Two atoms interact with each other as shown by the equation. complete the equation by filling in the missing parts. 1 2 3 4 5 h he li

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains