A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 115
I CHEMICAL CHANGE 91 Caution : If you dilute the sulphuric acid, he sure to add the acid to the water, and not the ivater to the acid. When most of the marble, or all of it, has been dissolved, evap¬ orate the resulting liquid to dryness over the flame. Call attention to the resulting white… … obviously not the same as the wood, a chemical change is one in which a substance loses its identity. Answer. — Physical : melting of ice, crushing of rock, mag¬ netizing of iron ; chemical : burning of candle grease, exploding of gunpowder, souring of milk, rusting of iron, digesting of food, the…
Science · Lattitude · Longitude · Time · Seasons · Metric · Forces · Levers · Work · Pulleys · Heating · Cooling · Convection · Water · Rocks · Air · Soil · Conduction · Thermometer · Winds · Color · Sound · Electricity · Magnetism
Internet Archive · National Library of Education · Public domain (published before 1931). Free to use for anything.
