During summer, the scorpion constellation can be easily seen. During winter, the Scorpion cannot be seen. How would you explain this observation? A. In winter, the Scorpion is usually hidden by the moon.

B. In winter, the Scorpion is covered by the Milky Way.

C. In winter, the Scorpion is in the sky during the day.

D. In winter, the Scorpion is often hidden by clouds.

Drug abuse will not lead to physical and psychological dependence. true or false ?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?