Which of the following changes has a decrease in entropy? A. N2O4 (g) yields 2NO2 (g)

B. C2H5OH (l) + 3O2 (g) yields 2CO2 (g) + 3H2O (g)

C. 3O2 (g) + 2KCl (s) yields 2KClO3 (s)

D. H2O (l) yields H2O (g)

What is the difference between the formula mass and the molecular mass?

An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment.

Sara's mom takes the parkway to work. It takes her 30 minutes to travel from mile to maker 88 where she enters her exit mile maker 121. What is her average speed?

Select all that apply. 1,670 cm3 = 1,670 mL 1,670 kg 1.67 L 1.67 g

Which word best discribes entropy

What is the pressure, in mm Hg, of 2.50 moles of an ideal gas if it has a volume of 50.0 liters when the temperature is 27.0° C?

What element has the same valence electrons as carbon A) N B) AI C) Si or D) Be

What element is represented by the following electron configuration: 1s22s22p63s23p64s23d4 Question 2 options: Cr Ca Ge Ar

He substance, cocl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.