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A solution of NaOH has a concentration of 4 g/dm3. What is the mass of NaOH contained in 250 cm¬3 of this solution?


evise a procedure to dilute part of the 0.200 mol/L solution to make 20 mL of 0.150 mol/L solution. (hint:  use the dilution formula).  Write a sentence that describes how much of your initial 0.200 mol/L solution needs to be used, and how much water needs to be added to make this solution



Group 7a elements tend to lose or gain electrons when they form ions



how many liters of neon gas are in 7 moles of neon gas?


Derive the relationship between the temperature and volume for a reversible adiabatic process.


1.5 grams of ethanol (CH3CH2OH) is burned under a 300-milliliter sample of 

water. This causes the water sample to increase the temperature by 55°C. 

Calculate the heat of combustion of ethanol. Assume that the density of water is 1 

gram/milliliter.


In a nutrient medium that lacks histidine, a thin layer of agar containing ~109 Salmonella typhimurium histidine auxotrophs (mutant cells that require histidine to survive) produces ~13 colonies over a two-day incubation period at 37 ° C. How do these colonies arise in the absence of histidine?


Starting with the solid and adding water, how would you prepare 2.00 L of 0.685 M Ni(NO3)2?


1. Give four procedures to be followed in search for a "lead" as a drug designer.

2. Give three examples of natural products as leads/protypes for drug development.

3. Give two reasons for chemical modification.


what size container do you need to hold 4.97 mol of N2 gas at STP


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