1. From the mass of salt taken and the mass (volume) of water used, and from the temperature change, calculate the quantity of heat that flowed during the dissolving of the NH4Cl and CaCl2.

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots