Which list of formulas represents compounds, only?

(1) CO2, H2O, NH3 (3) H2, Ne, NaCl

(2) H2, N2, O2 (4) MgO, NaCl, O2

Given a stock standard solution of concentration 0.200 M, calculate the volume in mL required to make up calibration standards of the following concentrations (in 25.0 mL volumetric flasks) 1.60 x 10-2 M ... mL

The average daytime temperature on the planet Mercury is 683 K. What is this temperature in Celsius? A. 956oC B. 680oC C. 410oC D. 715oC

The number of molecules of nitrogen, n2, found in 500.0 g of nitrogen gas is?

Which metals have similar chemical properties? Check all that apply. barium

What is the change in enthalpy of the first reaction below, given the enthalpies of the other two reactions? 2NO (g) + O2 (g) + 2NO2 (g) N, (8) + O2 (g) → NO (g) N, (8) + O2 (g) + NO2 (g) AH = 90 kJ/mol AH° = 34 kJ/mol A. 56 kJ B. - 112 kJ C.

Assume that 4 molecules of nitrogen and 9 molecules of hydrogen are present? after complete reaction, how many molecules of ammonia are proceded?

Which of the following are chemical changes? Check all that apply. A. sugar is dissolved in water B. A warm coke bottle fizzes when opened C. The Copper roof turns green over time D. Baking soda is dissolved in vinegar and bubbles appear E.

Which metal will more easily lose an electron sodium or potassium

What genetic engineering issue is of greatest public concern? A. It may create new varieties of food. B. It may create new medicine. C. It may create new opportunities for research. D. It may create new allergies in humans

Diamonds are more expensive than water because a. markets do not always reflect value. b. they have fewer uses. c. they yield higher marginal utility. d. they yield higher total utility. e. all of the above