General Chemistry Answers

1. A carbon wire with a 3 mm diameter has a resistance of 100 ohms. How long is the wire?

2. A 200 m long aluminum wire has the same resistance and cross sectional area as a carbon wire. What is the length of the carbon wire?

3. A wire made of an unknown substance has a resistance of 125 mΩ. The wire has a length of 1.8m and a cross-sectional area of 2.35 x 10^-5 m^2. What is the resistivity of the substance from which the wire is made? Give your answer in scientific notation to one dicimal place.

1. Consider an example in which 18.0 grams of C6H12O6 is dissolved in 1 kg of water. What is the molality of the resulting solution?

2. What is the mole fraction of sulfur dioxide (SO2) in an industrial exhaust gas containing 128.0 g of sulphur dioxide dissolved in every 1500 g of carbon dioxide?

3. A 123.0 g sample of hardwater is found to contain 0.015 g of calcium carbonate (CaCO3). What is it's concentration in ppm?

Describe a procedure for making rock candy using sucrose. At 20°C, the solubility of sucrose is 230.9 g/100 g H2O. At 50°C, it is 260.4 g/100 g H2O. At 100°C, it is 487 g/100 g H2O

If the average temperature of the ocean were to increase, how would this affect the ocean's ability to absorb carbon dioxide?

What would happen to the added KNO3? What would happen if you repeated the procedure, except with sodium chloride (NaCl)?

How much energy was transferred during the phase change shown on the

cooling curve above? Use the phase diagram and table of values below to

help you answer the question.

How many moles of N

N are in 0.024 mol

mol of quinine?

what can be observed when you mix copper and copper sulphate

I have a balloon that can hold 100 liters of air.if I blow up this balloon with 3 moles of oxygen gas at a pressure of 1 atmosphere, what is the temperature of the ballon

Use the thermochemical equations shown below to determine the enthalpy for this reaction: 2 H₂O_(g) + 2 Cl_2(g) → 4 HCl_(g) + O_2(g) 

ΔH_rxn =   

Information:

COCl_2(g) + H₂O_(l) → CH₂Cl_2(l) + O_2(g) 

ΔH = 19 kJ

H₂O(g) →H₂O(l) 

ΔH = -44 kJ

HCl_(g) →1/2 H_2(g) +1/2 Cl_2(g) 

ΔH = 92 kJ

CH₂Cl_2(l) + H_2(g) + 3/2 O_2(g) → COCl_2(g) + 2 H₂O_(l) 

ΔH= -161kJ