A barrel of water weighs 60 pounds. What must you put in it for it to weigh 40 pounds?

Which could be the catalyst in a chemical reaction?

Distinguishing ionic, molecular and atomic solids web activity

What is the correct way to write 340,000,000 in scientific notation? 34x10 (7th power) 3.4x10 (7thpower) 3.4x10 (8thpower) 3.4x10 (9thpower)

Using this equation 2H2+O2->2H2O when 47g of water are produced, how many grams of hydrogen must react

The decomposition of hydrogen peroxide is given by this equation: 2h2o2 (l) ? 2h2o (l) o2 ( g. calculate the mass of water (in grams) and the volume of oxygen at stp formed when 2.00x10-3 mol of hydrogen peroxide is decomposed.

What is it called when energy is created without oxygen?

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) - > 2LiOH (aq) + H2 (g)

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)