It requires 2,500 joules to raise a certain amount of water (c=4.186 J/g•C) from 20.0•C to 60.0•C.

What is the mass of the water that is being heated?

A. 63g
B. 15g
C. 40g
D. 80g

they are made of gases.

they have a spherical shape.

they make energy through fusion.

im pretty sure its b

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

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.