are huge loops or sheets of gas erupting from active regions around sunspots. These features arch into the Sun's atmosphere and connect pairs of sunspots. A. Prominences B. Coronae C. Solar flares D. Photospheres

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2