# Chemstry

29 results

**chemstry**

element how to invole them chemstry 30 name

**chemstry**

name Fe 2+ according to the stock system

**chemstry**

the reaction of fe(metalic) in sponge iron

**science**

i need help with chapter 5.1 for a chemstry review.

**chemstry**

How could you tell if a compound consistd of ions if it does not dissolve in water?

**chemstry**

when the equation is balanced, the lowest whole number coffinent for hydrogen is?

**chemstry**

calculate the amount of energy required to convert 55.0g of ice at -10.0°c into steam at 125°c?

**chemstry**

What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?

**chemstry**

How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?

**chemstry**

How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?

**chemstry**

Classify six kinds of amino acids according to the functions that they serve in the human body, stating an example for each class.

**Chemstry**

4NH3+5O2--->4NO+6H2O determine the amount of oxygen needed to produce 1.2x10^4mol of nitrogen monoxide gas

**Chemstry**

How many moles of NaCL are contained in .2570 L of a 37.5 mM Solution of NaCl?

**chemstry**

How many grams of CaCl2 would be dissolved in 1.4 L of a 0.11 M solution of CaCl2?

**Chemstry**

What is the structure of N4O, where the 3 nitrogen bonds have different bond lengths and the N=O bond is a double bond. I just don't get it

**chemstry**

the hiv virus that causes aids destroys the immune system in the body. classify the hiv virus and explain the statement

**chemstry**

the most prominent line in the spectrum of an element is 267.2 in what region of the electromagnetic spectrum is this line found

**Chemstry**

A 5.00 gram mixture of CaO and CaCO3 is heated strongly. After heating, the mixture has a mass of 4.00 grams. What % of the original mixture is CaCO3?

**Chemstry**

A 4.1089 g piece of aluminum wire with a circular cross section is 42.06 cm long and has density of 2.6989 g/cm3. What is the volume of the wire and the cross sectional area of the wire in cm2?

**Chemstry**

Mercury concentration in a polluted lake is 0.0125 micrograms/L. What is the total mass in kilograms of mercury in the lake if the lake is approximately circular witha diameter of 10 miles and an average depth of 50 ft.?

**CHEMSTRY**

. A 25.0 ml sample of Ni2+ gave a weight height of 2.36 uA( corrected for a residual current) in a polarographic analysis. When 0.500 ml of solution containing 28.7 nmol of Ni2+ was added the wave height increased to 3.79 uA. Find the concentration of Ni2+ in the unknown?

**Chemstry Help Drbob!**

How much heat (in kJ}) is required to vaporize it? (Assume a density of 1.00 g/mL ) I have this 60.0ML/ 1.00 g/ml = 60grams 60/153/81 g/mol = .3900916715 moles .3900916715 moles / 43.9 kj/mol = 17.122 And it keeps telling me the answer is wrong.

**Chemstry**

Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min. The air leaving the liquid is saturated with water at 25 degrees celcius and 1.5 atm. How long it will take for all of the water to vaporize.

**chemstry**

In a constant-pressure calorimeter, 50.0 mL of 0.340 M Ba(OH)2 was added to 50.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 23.69 °C to 28.32 °C. If the solution has the same density and specific heat as water, what is ÄH for this ...

**Chemstry**

Lovastatin (C24H36O5) has a molar mass of 404.53 g/m. The normal dose of the drug lovastain is 20mg. How many molecules of lovastatin (C24H36O5) are in a normal dose?

**CHEMSTRY**

. A small amount of solid Hg2Cl2 and 25 ml of metallic mercury were added to a solution of 5.03 x 10-2 M NaCl. A platinum electrode immersed in the layer of mercury was connected to a reference half-cell whose electrode potential was 0.222V. The voltage of the cell was 0.121 V...

**Chemstry**

For the reaction A(g) + B(g) <==> C(g) + D(g) the equilibrium constant K is defined as K = Y(sub y) * Y(sub D) / (Y (sub A) * Y(sub b)) where y is the molar fraction of the gas phase of a species At 620.00 K, the equilibrium constant is 1.100. Suppose the feed to a ...

**Chemstry/(microsoft excel)**

I am having a hard time solving this problem. The formula given is: T=Tin - (Tin - Tinit.)e(-v/v)t If the initial temperature Tinit is 115 (degrees F), the cold water temperature is 35 (degrees F) (1.7 degrees C), and the volume and volumetric flow rate are 3,000 liters and 30...

**Chemstry**

I just copied this because i have a couple more questions on this part.... Sulfuric acid/ Lead Battery: -the electrodes for the battery are composed of Pb(s), PbO2, and/or PbSO4. What are the half reaction occuring at each electrode? include electrolysis of water: Process ...

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