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Question 1: A chemist is designing an experiment to investigate the effect of temperature on the rate of a chemical change. Suggest a suitable hypothesis for the experiment. Also, list the dependent, independent, and controlled variables that can exist in such an investigation.
Question 2: Compare the type of change that occurs when a match is burnt and when a liquid starts boiling. Use complete sentences to justify the type of change that occurs.
The carbonyl peak of benzaldehyde appears as a very strong and intense peak at 1703 cm -1. Normally the carbonyl peak of an aldehyde appears at 1725 cm -1. Why does the carbonyl peak of benzaldehyde appear at a lower frequency
mass of solvent134.4 gmolthe same mass of solute is dissolved in 9.82 g of t-butanol instead of cyclohexane. what is
What is the total molar concentration of all the ions in 0.030 M solutions of the following salts in water a) 0.030 M KCl = ________ M ions b) 0.030 M CuSO4 = _____ M ions c) 0.030 M CaCl2 = _______ M ions
What Celsius temperature, T2 , is required to change the volume of the gas sample in Part A ( T1= = 45 c, V1 = 1.49×103 L ) to a volume of 2.98×103 L?
A .647 L sample of hydrogen chloride (HCl) gas at 1.12 atm and 23°C is completely dissolved in 885 mL of water to form hydrochloric acid solution. Calculate the pH of the solution.
The CO2 output of an astronaut is about 1.3 kg/day. What is the minimum mass of LiOH required for a six-day space shuttle flight involving five astronauts?
A silver electrode of the first kind was used to measure the Ag+ ion concentration in solution. When the [Ag+] is 1.44 x 10-3 the Ecell is determined to be 0.626. Calculate the temperature (oC) using the Nernst equation.
write the acid ionization equation and ionization conexpression for the hydrogen carbonate ion
Problem- A weak acid (HA) has a pKa of 4.919. If a solution of this acid has a pH of 4.762, what percentage of the acid is not ionized. Assume all H in solution came from the ionization of HA.
Calculate the internal energy (in Joules) of an endothermic system that absorbs 263.2 J and expands from 1.00 to 13.55 L against a pressure of 4.69 atm.
the mineral greenockite is a rare yellow sulfide of cadmium that is 78.0% cadmium and 22.0% sulfur by mass. Determine the empirical formula of greenockite.
Measurements of CH3SCH3 (dimethyl sulfide) were in the range of 250-500 ng m-3. Alter these values to mixing ratis in ppt at 298 K at sea level
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