Which of the following is an example of physical change? a. crushing a soda canb. copper tarnishingc. baking a caked. mixing baking soda and vinegar

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.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

In salt water solution,the salt is the blank