Consider the reaction 2Al (OH) 3 (s) →Al2O3 (s) + 3H2O (l) with enthalpy of reaction ΔHrxn∘=21.0kJ/mol What is the enthalpy of formation of Al2O3 (s) ?

Give the number of significant figures: 369,132,000 sec

A target is shielded from a radioactive sample by a sheet of metal. What kind of radiation can pass through the sheet of metal and hit the target?

What are the three states or matter? Whoever answers first, gets a follow bck

The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below? 7Li A. 2 neutrons B. 13 neutrons C. 4 neutrons D. 7 neutrons

The specific heat capacity of aluminum is 0.215 cal/g° c. An aluminum pot has a mass of 500 g. How many calories of heat are required to raise the temperature 1 degrees Celcius

A Gran plot for a potentiometric titration resulted in a slope of 5.56 x 105. Measurements were made using SCE as the reference electrode and the analyte Eo was determined to be 0.354 V.

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In which choice is the ellipsis used correctly to select from this sentence from The Scarlet Letter? A throng of bearded men, in sad-coloured garments and grey steeple-crowned hats, inter-mixed with women, some wearing hoods, and others bareheaded,

Explain the difference between the greenhouse effect and global warming.

How does adding salt affect the surface tension of water? if it increases surface tension, will it always increase it?