Identify the type of reaction cao h2o ca oh 2

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

Stage in which a star’s outer layers have started to cool and grow outward?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt