Which of the following will result in a chemical change?

A. Evaporating alcohol into vapor

B. Drying wood in a shed

C. Melting ice to obtain water

D. Burning coal in a furnace

2. Describe in a step by step manner how you determined the identity of the two unknowns. Discuss both what you determined the unknowns to be and the method that you used to find them.

Calculate the number of moles in 9g of water

How would you describe the motion of plates in a subduction zone?

The density of an aqueous solution of nitric acid is 1.36 g/ml and the concentration is 2.48 m. what is the concentration of this solution in percent by mass?

The reaction A → B + C is known to be zero order in A with a rate constant of 5.0 * 10-2 mol/L·s at 25°C. An experiment was run at 25°C where [A]0 = 1.0 * 10-3 M. What is the concentration of B after 5 * 10-3 sec? A. 5.0 * 10-4 M B. 7.5 * 10-4 M C.

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.

Which of the following terms is defined by the measure of mass per unit of volume? gravity density weight acceleration

Select the lon. O NO₂ H2SO4 O A3

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.