How many moles of magnesium are needed to react with 3.0 mol of O2?

2Mg (s) + O2 (g) → 2MgO (s)

Which procedure could a student use to examine an intensive property of a retangular block of wood

Calculate the number of moles of water lost. (take the # of grams in #10 and convert to moles.)

Jenny measures the temperature inside a cave to be 10°C. The temperature outside the cave is about 30°C warmer.

What are the forces that create electromagnetism?

Liquid X has a pH of 7 and Liquid Y has a pH of 8.5. Which statement is true? Liquid X is a base and Liquid Y is an acid. Liquid X is an acid and Liquid Y is a base. Liquid X is neutral and Liquid Y is a base.

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?