Why does ice have a lower density that liquid water does?

Washing soda is a hydrate of sodium carbonate. Its formula is Na2CO3. x H2O. A 2.714 g Sample of washing soda is heated until a constant mass of 1.006 g of Na2CO3 is reached. What is x?

In the chemical reaction equation zn + 2HCL - - - > ZnCl2 + H2

A precipitation reaction is caused by mixing 100. mL of 0.25 M K2Cr2O7 solution with 100. mL of 0.25 M Pb (NO3) 2 solution. When the precipitate forms, it is filtered from the mixture.

Give examples of stimuli detected by the nervous system.

In a two-stroke piston-port engine, the transfer tube is used to transfer fuel from the A. crankcase to the top of the combustion chamber. B. intake port to the exhaust port. C. cylinder to the carburetor. D. the fuel tank to the piston.

A 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evoled at 21degree celcius and 748mm of Hg?

What does it mean for data to be continuous?

When an acid reacts with a base what compounds are formed? a. a salt only. b. water only. c. a salt and water. d. metal oxides only.?

What is the differences between River system, Tributary?

having that coloration is selected for since many predators will recognize it and stay away. Therefore the common coloration is beneficial to the butterflies and becomes more common. What type of selection is involved?