What element is used in bright flashing advertising signs

What would cause the percent yield of a reaction to be less than 100%? All of the limiting reagent gets used up. The product participates in a side reaction. A balanced chemical equation is used. Pure reactants are used.

How does a hydronium ion molecule form? A) Evaporation. B) Two water molecules bonded. C) A water molecule gained an hydrogen ion from another water molecule. D) A hydrogen molecule bonded with an OH - molecule. E) A water molecule split in half

9 Which list includes three types of chemical formulas for organic compounds? (1) covalent, metallic, isotopic (2) covalent, metallic, molecular (3) empirical, structural, isotopic (4) empirical, structural, molecular

Zinc reacts with hydrochloric acid according to the reaction equation how many milliliters of 3.50 m hcl (aq) are required to react with 2.25 g of zn (s) ?

1. Why do rings stay shiny?

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?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.