Which of the following could indicate that a chemical change has taken place?

gas formation

formation of a precipitate

color change

all of the above

A 5.10 g sample of iron is heated from 36.0 to 75.0 C. The amount of energy required is 89.5 J. The specific capacity of this sample of iron is ... A.) 17800 J/g C B.) 0.900 J/g C C.) 11.7 J/g C D.) 0.450 J/g C E.) 2.22 J/g C

If 180.5 kj of heat are required to boil 80.00 grams of water, what is the heat of vaporization of water?

Calculate the number of miles of aluminum oxide in 6.83 g AL2O3

This unit discusses in detail the role of catalysts to lower the activation energy of reactions. The term catalyst appears in nonscientific discussions to refer to something that provokes or speeds significant change or action.

Ka for hcn is 4.9 ⋅ 10-10. what is the ph of a 0.068 m aqueous solution of sodium cyanide? ka for hcn is 4.9 10-10. what is the ph of a 0.068 m aqueous solution of sodium cyanide? 0.74 7.00 2.96 13.24 11.07

Give me an example of lustre that is shiny and dull.

Which of the following animal niches will be filled as in ecosystem Begins the stage of ecological succession

List the five major pollutants in the United States

The net gain of atp per molecule of glucose fermented is

What is the name of this compound? CH3-CH2-CH2-CH2-O-C6H5 butylphenyl ether cyclohexylbutyl ether phenylbutyl ether butylcyclohexyl ether