Which element is a metalloid?

a. argon (ar)

b. silicon (si)

c. potassium (k)

d. magnesium (mg)

Which situation describes a reaction with a percentage yield of 100%? Select one: a. The amounts of reactants initially present are stoichiometric. b. The product is more than the limiting reagent has the potential to produce. C. none of them d.

How to balance chemical equations examples?

competed in a track meet and you run the 1500m race in 403 s. what was your average speed in miles per hour

If 0.092J of heat causes a 0.267 degree C temperature change, what mass of water is present?

Carbon-14 has a half-life of 5,730 years. How long will it take for 112.5 g of a 120.0-g sample to decay radioactively? A. 5,730 years. B. 11,460 years. C. 17,190 years. D. 22,920 years

How do the reaction rates change as the system approaches equilibrium?

Based on the symmetry of the molecules, which is a polar molecule? SeCl2 (bent) BeCl2 (linear) BF3 (trigonal planar) CF4 (tetrahedral) O2 (diatomic linear)

7) change 21.1 mg into grams

Why is an ionic solution a good conductor of electricity while a covalent solution is a poor conductor

How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem. Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g)