A scientist to study in a sample of an unknown substance do scientist determine's with the substance is a metalloid with four valence electrons. Which two elements could the unknown be

Predict which of the following compounds will be insoluble in water. A. NaCl B. HCl C. CF4 D. CuSO4

What mass of calcium chloride will be produced from 4.09 g of hcl reacting with ca (oh) 2

What is the mass of one mole of titanium atoms

Roundup, an herbicide manufactured by Monsanto, has the formula C₃H₈NO₅P. How many moles of molecules are there in a 304.3-g sample of Roundup?

If 0.015 g of thyroid extract contains 25 mcg of thyroxine, how much thyroxine is contained in 15 mg of thyroid extract?

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?