A marathon is a race that commemorates the run made by a Greek soldier, Pheidippides, that took place in August 490 BC. The soldier ran 26.2 mi. How many kilometers did he run?

What is the number of molecules of c2h5oh in a 3m solution that contains 4.00kg h2o?

Atomic number of Element A is 11 and that of element B is 9. Write the formula of the compound formed when A combines with B. b) Find the group of these elements.

Calculate the energy absorbed when 6.20 g of aluminum is heated from 10.0°C to 65.0°C if the specific heat of aluminum is 0.900 J/g°C

Which of the following affects the rate of a chemical reaction? a. the presence of a catalyst b. the temperature c. the concentration of reactants d. all of the above

A galvanic cell has an x electrode with x 2 plus ions in the left beaker and a y electrode with y 2 plus ions in the right beaker. a salt bridge connects the two halves.

Gasohol is a fuel containing ethanol (c2h6o) that burns in oxygen (o2) to give carbon dioxide and water.

Consider a neutral atom with 30 protons and 32 neurons. What is the atomic number of the element?

Find the molarity and molality of 37.0 wt% Hcl. Assume the density of the acid is 1.19g/ml

Which excerpt from "Bone Detective" best shows that Diane France is recognized as an expert in her line of work? But, once again, she was able to produce an amazingly detailed impression.

Blank of water is a physical change because boiling the water is blank from a liquid to a gas