Which equation shows a physical change?

Pb (NO3) 2 (aq) + 2KI (aq) _ 2KNO3 (aq) + PbI2 (s)

HCl (aq) + NaOH (aq) _ NaCl (aq) + H2O (l)

2H2O (l) _ 2H2 (g) + O2 (g)

H2O (g) _ H2O (s)

List two major properties of most metals on the periodic table

The process of converting nitrogen into nitrogen compounds by bacteria is called:

What is necessary in order for clouds to form when the atmosphere is absolutely stable? cooling of the air mass from below a lifting mechanism other than convection (such as a front) an environmental lapse rate less than 5°C a high degree of

In the metric system, which of the following is correct? 1,000 liters = 1 milliliter 1,000 kilograms = 1 gram 100 centimeters = 1 meter

In any food web, animals function as a A) carnivores. Eliminate B) consumers. C) decomposers. D) producers.

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False

An equilibrium is dynamic. True False