Which of the following is an example of physical evidence? A. Hair B. Fibers C. Soil D. All of the above

A rectangular steel block of dimension 100cm * 50m * 20cm has a mass of 450kg. Calculate the density.

What would happen to the equilibrium mixture if the chlorine gas was allowed to escape? (explain your answer)

Calculate the radius of an iridium atom, given that ir has an fcc crystal structure, a density of 22.4 g/cm3, and an atomic weight of 192.2 g/mol.

An alcohol and an ether have the same molecular formula, C2H6O. These two compounds have A) the same functional group and the same physical and chemical properties B) the same functional group and different physical and chemical properties C)

Design a device that will knock a block of wood a distance of 5 meters. That was the challenge in science class. Ben and Sam designed a pendulum to move the wood block. Their first design moved the block about 1.5 meters.

You need to make 10 mL of 2 mg/ml solution of protein and you have 25 mg/mL solution. How much protein solution and water do you need to mix in order to make the required solution?

The definition of volume is? a) width*height b) the space occupied by mass c) the space occupied by a liquid d) the mass of liquid required to fill a container

What is the empirical formula of a substance that is 53.5% C, 15.5% H, 31.1% N?

What is the lowest layer of the atmosphere and what is its highest altitude?

An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom?