Which change is exothermic?

(1) freezing of water (2) melting of iron (3) vaporization of ethanol (4) sublimation of iodine

Differentiate between Ion, element, atom and molecule.

What is the word and balanced equation for: Iron plus Lead (II) Sulfate react forming Iron (II) Sulfate plus Lead?

Describe a simple test to determine whether a solution is unsaturated saturated or supersaturated.

In the last 100 years, the level of CO2 in the atmosphere has been significantly increased by man by: pesticides the burning of fossil fuels domestic heat incineration of waste products

What 2 parts of an atom does the atomic # represent?

How many liters of space will 7.80 moles of methane gas (CH4) occupy at STP

Which is an example of the flow of heat through conduction? Hot air rises to the top of the room A hot-air balloon rises into the sky Heat flows from a hot liquid to a pot handle Heat causes winds to blow from the water to the land

Jin listed some common thermal insulators and conductors in a chart. A 2-column table with 2 rows. The first column labeled Insulators has entries rubber, air. The second column labeled Conductors has entries copper, X.

A major component of gasoline is octane. When liquid octane is burned in air it reacts with oxygen gas to produce carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of of oxygen.

Which of the following statements about transition metals is true? a. They are never found uncombined in nature. b. They include familiar metals such as gold, silver, copper, and nickel. c.