Define a physical change

If 15.60g of a hydrated compound is heated in an oven for several hours, its mass drops to 8.63g. Assuming that the reduction in mass is due to the loss of water what is the percentage of water in the original hydrate?

What is the name of the reaction of chlorine and potassium iodide?

How many moles of KBr will be produced from 7 moles of BaBry? BaBr2 + K2SO4 → KBr + BaSO4

A sample of an ideal gas at 1.00 atm and a volume of 1.72 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 35.

How does the behavior of the particles determine the properties of the state of matter?

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.