Why doesn't the mass number of an isotope match the atomic mass given on the periodic table?

Nitrifiers are bacteria a. capable of living in symbiosis in the roots of some plants. b. capable of oxidizing NH3 using NO. c. that convert N2 to NH3. d. that generate nitrites or nitrates. e. capable of using NH3 as an electron donor.

In a laboratory experiment, John uses mesh to seperate soil particles from water. Which technique of seperation is he using?

What mass of glucose (C6H12O6) is needed to prepare 200.0 ml of a 2.50 M glucose solution?

The atomic number of nitrogen is 7. How many protons, neutrons, and electrons make up an atom of nitrogen

The real purpose of the Milgram study was to investigate 1. the effects of punishment. 2. memory and learning. 3. the effect of electric shock. 4. all of the above

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?