Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. however, consider a pipe where water was allowed to sit in the pipe. the hot water cools as it sits in the pipe. what is the temprature change, (δt), of the water if 199.0 g of water sat in the copper pipe from part a, releasing 2793 j of energy to the pipe? the specific heat of water is 4.184 (j/g)⋅∘c.

Infants born with severe respiratory problems are sometimes given liquid ventilation: they breathe a liquid that can dissolve more oxygen than air can hold. one of these liquids is a fluorinated compound, cf3(cf2)7br. the solubility of oxygen in this liquid is 66 mlo2 per 100 ml liquid. in contrast, air is 21 % oxygen by volume. calculate the moles of o2 present in an infant's lungs (volume: 12 ml ) if the infant takes a full breath of air. assume a pressure of 1 atm in the lungs.

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)