Based on their chemical formulas, which of these common substances is an element?
A. Bleach (NaClo)
B. Silver (Ag)
C. Quartz (SIO2)
D. Marble (CaCO3)

Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %

What mass of ca(oh)2 is needed to make 1250ml of a .75m solution?