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)

A chemist has 2.0 mol of methanol (CH₃OH). The molar mass of methanol is 32.0 g/mol. What is the mass, in grams, of the sample? 16 30 32 64

What is the mass of a block with a volume of 18 cm^3, and a density of 9.2 g/cm^3?

The table below describes the temperature of different colors of stars. Color Temperature red under 3,500 K orange-red 3,500 - 5,000 K white-yellow 5,000 - 6,000 K blue-white 6,000 - 7,500 K blue 7,500 - 25,000 + K If the Sun is white-yellow, which

The molar mass of sucrose (C12H22O11) is 342.3 g/mol. A chemist has a 0.500-mol sample of sucrose. What is the mass, in grams, of this sample? a) 171 b) 342 c) 500 d) 684

Which of the following causes tornadoes?

A living thing that cannot make its own food and must eat other living things for energy

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth? • They are falling toward Earth at the same rate as the space shuttle.

If increase the amplitude how does the velocity change? (No google)

What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

What is 0.002353 to two significant figures