In the winter , people often buy large bags of rock salt to sprinkle on their walkways . why do people do this?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

How do you lengthen a pattern piece? (family and consumer science, sewing)

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.