19) Which if the following is a heterogeneous mixture?

a. Air

b. Steel

d. Soil

The following equation can be used to relate the density of liquid water to Celsius temperature in the range from O°C to about 20°C, rho (g/cm3) = 0.99984 + (1.6945 x 10-2 t) - (7.987 x 10-6 t2) 1 + (1.

A 5.0-gram sample of Fe (s) is to be placed in 100. milliliters of HCl (aq). Which changes will result in the fastest rate of reaction?

The solutions of some molecular compounds are good conductors of electricity. explain how this can be true when ions are required to conduct electricity

What is the difference between property and change?

The first step in the ostwald process for producing nitric acid is as follows: 4nh3 (g) + 5o2 (g) ? 4no (g) + 6h2o (g). if the reaction of 15.0 g of ammonia with 15.0 g of oxygen gas yields 8.

When does raising the temperature of a gas increase its pressure? A. temperature B. volume C. number of particles D. pressure

Hexyne. What does the name of this hydrocarbon tell you about its molecular structure?

Which of the following processes includes all of the others? Group of answer choices transport of an ion down its electrochemical gradient osmosis passive transport facilitated diffusion

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed