Chemistry, 13.12.2019 17:31 sharonkrobinson
Consider the laboratory on hplc analysis of components in diet soft drinks. your standard solutions for caffeine were prepared from a stock solution of 0.40 mg/ml caffeine, from which you drew, 1.0, 2.0, 3.0, 4.0 and 5.0 ml and diluted each one to 50.0 ml. calculate the concentration of the most concentrated standard solution. for the same lab as in problem 1, suppose you plotted peak height (y-axis) vs. concentration in mg/ml (x-axis), and the slope was found to be 25.0 ml/mg. if the peak height for the unknown was 15.5, calculate the concentration in the unknown. assume the intercept was zero.
Answers: 3
Chemistry, 21.06.2019 22:10
What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance
Answers: 2
Chemistry, 22.06.2019 09:10
Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons
Answers: 3
Chemistry, 22.06.2019 18:30
When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?
Answers: 1
Consider the laboratory on hplc analysis of components in diet soft drinks. your standard solutions...
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