NEED ANSWER ASAP You are asked to make 500. mL of a 0.250 M NaCl solution. How many moles of NaCl would you need?

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Which property of water causes water drops to bead on a freshly waxed car?

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals