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Elements such as boron, silicon, and arsenic, are examples of:

The O2- ion has how many protons and electrons?

When a 45.0 g sample of an alloy at 100.0°C is dropped into 100.0 g of water at 25.0°C, the final temperature is 37.0°C.  What is the specific heat of the alloy?  The specific heat of H2O(l) is  4.184 J∙g–1∙°C–1. 

A 1200. g piece of rock (cs = 0.790 J/g°C) at 60.00°C is placed in a bucket of water. At equilibrium, both the rock and the water have a final temperature of 24.00°C. How much water (cs = 4.18 J/g°C), initially at 18.00°C, was in the bucket?

If the following operations were carried out, how many significant figures would the answer contain? 0.750 x 11 / 9.250 =

When this equation is balanced with the smallest set of whole numbers, what is the coefficient for SO2?  ___FeS2(s) + ___O2(g)

What is the ground state electron configuration for the sulphide ion (S2-)?

Which of the equations below does not show the standard heat of formation of a compound?

What is the formula for the compound formed when sodium and oxygen ions are combined?

Calculate the quantity of heat released when one mole of oxygen is burned according to the reaction: CH4(g) + 2O2(g) –> CO2(g) + 2H2O(g)