Express each of the following numbers in scientific notation with correct significant figures:

(a) 711.0

(b) 0.239

(c) 90743

(d) 134.2

(e) 0.05499

(f) 10000.0

(g) 0.000000738592

What is the def of chemical equation

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In a redox reaction, what role does the reducing agent play? A - It gives up electrons B - It keeps its electrons C - it takes electrons D - it takes oxygen atoms

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60.0 mL of 0.100 M Ca (OH) 2 solution is mixed with 50.0 mL of 0.100 M HNO3. Calculate the volume of 0.100 M H2SO4 needed to neutralize the resulting mixture.

How many atoms of Hydrogen are in 67.2 L of H2 at STP?

If a 45 mM phosphate solution (solution A) had an absorbance of 1.012. What would be the absorbance if 11 mL of solution A was used to prepare a 20.0 mL of a new phosphate solution. Write answer to three significant figures.

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