What are isotopes used for in chemistry

WILL How does one determine a percent composition from an empirical formula?

Mitochondrial DNA is found where in relation to the cell? A. Inside the nucleus B. Inside the cell, but outside the nucleus C. Outside the cell D. Inside the nucleus of bruccal cells

Which material is the least likely to be recognized as a mixture by looking at it under a microscope? a suspension a colloid a homogeneous mixture a heterogeneous mixture

Alchemists were medieval scholars and philosophers who were the forerunners of modern-day chemists. many tried repeatedly to transform lead (atomic number 82) into gold (atomic number 79). explain why they never did succeed.

1. How many atoms are in a water molecule? 2. Describe the structure of a water molecule. 3. How do water molecules form droplets of water? 4. Why is water called the universal solvent? 5. Explain how NaCI or table salt dissolves in water?

Relate How do atoms relate to cells?

Rank the following compounds in terms of decreasing vapor pressure. Cl-CH2CH2OH CH3-O-CH3 CH3CH2OH CH3OH

A specific steroid has a λmax of 282 nm and a molar absorptivity ε of 11, 500 L mol - 1 cm - 1. What is the concentration of the compound in a solution whose absorbance at 282 nm is A = 0.060 with a sample pathlength of 1.00 cm?

The chemical formula for a covalently bonded group of atoms is called a

What is the molar mass, in grams, of a mole of an element equal to?