21. A block of gold has a mass of 5.3 Kg. How many troy ounces of gold have? a. 170 oz c. 1.7 oz
b. 340 oz d. 1700 oz
22. You drive to Roswell, 73 miles, in 65 minutes. How fast did you drive in Km/hr?
a. 54 Km/hr c. 108.5 Km/hr
b. 41.8 Km/hr d. faster than the speed limit

Amines are good nucleophiles, even though they are neutral molecules. how would the rate of an sn2 reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? amines are good nucleophiles, even though they are neutral molecules. how would the rate of an reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? because both reactants in the rate-limiting step are neutral, the reaction will be faster if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will be slower if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will occur at the same rate if the polarity of the solvent is increased. request answer

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.