Ariel was told to soak her wilted lettuce leaves in water before making a salad with them. On following the advice, she noticed that the leaves became crisp and firm. Explain what happened to make Ariel's lettuce leaf firm

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

Which method would be best to separate a mixture of sand and gravel

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.