Which of the following items represents a chemical change? burning

melting

evaporation

freezing

In order for a plant to complete photosynthesis, all of the following need to be present except: Oxygen Sunlight Water Carbon Dioxide

The phase change that is reverse of evaporation is

All of the following need to be present for a plant to do photosynthesis except light water oxygen carbon dioxide

2. What kinds of elements do molecular formulas contain?

What is the molarity of a 650. mL solution containing 64 grams of NaCl?

Why do ionic compounds conduct electricity when dissolved in water but most covalent compounds do not?

Which of the following is an example of a molecule? F C Al O2

Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled.

Research about the reaction of baking soda and vinegar

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?