A car that has a mass of 1400kg sits next to a swimming pool containing 1400kg of water on a hot sunny day. After 5 hours, the aluminum on the car body feels
very hot. The water feels cool and refreshing. Which substance, the aluminum or
the water has the greater specific heat capacity ? How do you know this, explain.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

there are two significant figures.

answer carbon and three oxygen atoms;

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.