Which of the following is not an indication of a chemical change? A. fracture formation. B. energy transfer. C. precipitate formation. D. gas production

You are performing a simple distillation of roughly 50:50 liquid solution containing two components, hexane and nonane You place 15 ml of the mixture in a round bottom flask, and then collect the distillate sequentially as four three ml samples

The chemical bonding in sodium phosphate, Na3PO4, is classified as:

If the net force on an object is zero, what can you conclude?

Which element below is considered the most versatile element in living organisms and why? A) hydrogen, because it is a key component in organic molecules and provides most of the mass of human bodies B) hydrogen, because it can be found in both

Mg3N2 + 3K2O à 3MgO + 2K3N If 6 moles of potassium oxide reacts with an excess amount of magnesium nitride, how many grams of potassium nitride will be made? Question 3 options: 524g K3N 1524 g K3N 14 moles K3N 345g MgO

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?