Check all appropriate safety precautions for handling each of the three items shown. A beaker about two-thirds full of a liquid. Check all that apply. Pour using tongs. Wear chemical resistant gloves. Taste to make sure it is HCl. A hot plate, with a knob on the front for setting temperature. A bunsen burner, with a flame visible.

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?