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Balance the following chemical equations. Classify the reactions as decomposition, combination, single-displacement, double-displacement, or combustion.
a. CaCl2(aq) + Na2SO4(aq) ? CaSO4(s) + NaCl(aq)
b. N2(g) + H2(g) ? NH3(g)
c. FeO(s) + CO(g) ? Fe(s) + CO2(g)
d. Ba(s) + HCl(aq) ? BaCl2(aq) + H2(g)
e. CaO(s) + H2O(l) ? Ca(OH)2(aq)
f. Na2CrO4(aq) + Pb(NO3)2(aq) ? PbCrO4(s) + NaNO3(aq)
g. KI(aq) + Cl2(g) ? KCl(aq) + I2(aq)
h. NaHCO3(s) + heat ? NaCO3(s) + CO2(g) + H2O(g)
A balloon ?lled with helium gas has a volume of 434 mL at a pressure of 1 atm. The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm.
If sample of sodium is dropped into a container of water the reaction is 2Na +2H2O ---> 2NaOH +H2. If 10.4 g of hydrogen are produced, how many g of NaOH are also formed
considering this homogeneous gas reaction ararr3r that follows second-order kinetics. for a feed rate of 6nbspm3hr of
Describe two different ways by which electrons can move from the valence band to the conduction band.
What is the name of the chemical formula Tl2Se. Does Tl have a +2 charge Tl (II)? Do all Roman numerals in chemistry have a positive charge
What is the difference between a "single beam" and a "double beam" instrument. What are some advantages and disadvantages for each of these instrument designs
Tartaric Acid is a diprotic acid with ka1=1.0*10^-3 and ka^2=4.6*10^-5. Calculate the concentration of tartarate ion, C4H4O62-, present in 0.015 M aqueous H2C4H4O6 soultion
Iodide ion catalyzes the decomposition of hydrogen peroxide. the reaction is first-order in H2O2. what is the value of the rate constant,k, if the initial rate is 0.00842 mol/(L*s)?
Determine the vapour pressure of a solution at 55C that contains 34.2 g NaCl in 375 ml of water. The vapour pressure of pure water at 55C is 118.1 torr. Assume a solution density of 1.00 g/ml.
a liquid unknown was found to be insolube in water and soluble in cyclohexane and alcohol, and have boiling point of 58C at 670mm Hg. what the substance? what could you do to confirm your answer?
How the concentration on Cl- was calculated from a solution of 0.0167M CdCl2. It gives the value [Cl-]=0.0334
boron has two naturally occurring isotopes 10b 19.9 and 11b 80.1. although the b2 molecule does not exist naturally on
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