Which of the following would not necessarily indicate a chemical reaction?

change in temperature

chemical precipitation of a solid

production of a gas

change in volume

Which combination of ion charge and ion size produces the greatest lattice enthalpy? A. High charge, large size B. High charge, small size C. Low charge, small size D. Low charge, large size

At a temperature of 280 K, the gas in a cylinder has a volume of 20.0 liters. If the volume of the gas is decreased to 10.0 liters, what must the temperature be for the gas pressure to remain constant? A. 140 K B. 273 K C. 560 K D. 5600 K

Which of the following best describes the main function of the nervous system? To deliver nutrients and other essential materials to cells and remove waste products To break down the nutrients found in food so that they can be used by all cells in

How does a plant take up nitrogen from surrounding soil

Select all that apply. A chimest is likely to do which of the following? A - analyze the ingredients in ice cream. B - determine why planets orbit the sun. C - determine how to separate gasoline from other substances in petroleum.

Which best describes the purpose of a controlled experiment describes the purpose of a controlled experiment?

What's the name for the phase change from solid to gas

If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. what kind of reaction took place?

In a solution such as salt water, the component that is dissolved is called the O solute O solvent O suspension O colloid

Which is the balanced chemical equation showing hydrogen peroxide (h2o2) decomposing into hydrogen (h2) and oxygen (o2) ? 1. h2 + o2 → h2o2 2. 2 h2o2 → 2 h2 + o2 3. h2o2 → h2 + o2 4. 2 h2 + o2 → 2 h2o2?