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Question #e901d

Polonium214 has a relatively short half life of 164 s. How many seconds would it take for 8.0 g of this isotope to decay to 0.25 g?

How do you graph # [sin x] #?

How do you graph #r^2 theta=1#?

How do you solve #2(6  x) = x(x + 5) # using the quadratic formula?

What is the Lewis structure of #BF_4^#?

How do you write the pointslope form of the equation below that represents the line that passes through the points (−3, 2) and (2, 1)?

What is the lewis structure of #NO^+#?

How do you write #f(x)=x^2+4x+6# in vertes form?

What is the heat capacity of a piece of wood if 1500 g of the wood absorbs 67,500 joules of heat, and its temperature changes from 32°C to 57°C?

What is half chair conformation?

How are aldehydes different from ketones?

What is the #"pH"# for #2.5 xx 10^(6) "M"# #"HCl"#?

What is the number of moles in 9.63 L of #H_2S# gas at STP?

How do you name cycloalkanes with halogens?

How do you name meso compounds?

How do you write an equation of a line going through (1,2) (1,2)?

What kind of reaction is #2Fe(s) + O_2(g) > 2FeO(s)#?

The product of two consecutive even integers is 168. How do you find the integers?

Question #19605

A 100.0 mL sample of .10 M #NH_# is titrated with .10 M #HNO_3#. What is the pH of the solution after the addition of 150.0 mL of #HNO_3#?

What is the equation to find pH and pOH?

How do you do addition reactions of alkenes?

What is the HendersonHasselbalch equation? How is it used in chemistry?

How do you find vapor pressure?

How do you graph #r^2=  cos theta#?

How many grams of #Cl# are in 515 g of #CaCl_2#?

The pH of a solution is 5.6. What are the hydrogen and hydroxide concentrations?

What is the vertex form of #y=4x^2x+4#?

What is the pH of a 0.85 M #NH_4Cl# solution?

How do you prove #cos(x+y)cos(xy)= cos^2x  sin^2y#?

Question #269de

What is the standard form of the equation of the parabola with a directrix at x=5 and a focus at (11,7)?

Question #7ee1d

How do you graph #r^2=2sin(3θ)#?

What is the standard cell notation of a galvanic cell made with silver and nickel?

You have a compound that is composed of 62.0 grams #C#, 12.15 grams #H#, 13.771 grams #O# and 12.059 grams #N#. What is its empirical formula?

If the mole fraction of #NaCl# in an aqueous solution is 0.0927, what is the percent by mass of #NaCl#?

At approximately what pressure will water be a vapor a 0°C?

How do you solve #x(x9)+20=0#?

What volume of 0.0500M KOH solution is required to completely
neutralize 3.0 mL of 0.17M H2SO4?

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