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1. a)A group of scientist is studying climate change by measuring the ratio of stable isotopes oxygen-18 and oxygen-16 from a melted ice core sample. Their ratio was found to be 1955 ppm. The Vienna Standard Mean Ocean Water 18O/16O isotopic standard (SMOW) is 2005 ppm. Calculate the δ18O (in units of 0/00).
b) Based on the calculated δ-18O from the previous question, calculate the temperature in oC.
2. If the albedo of the earth would be 21% (instead of 31%), the energy form the sun that reaches the earth surface would be (in J/s):
Suppose a sample of Zn(s) is reacted with HCl(aq) to form hydrogen gas. Explain the H2 gas bubbles out of aqueous solution and is collected in a 552.0mL container at 618.3 Torr and 25 C. Explain how many grams of zinc reacted. Be sure to account f..
one of the standard solution had an abnormally low absorbance reading, causing a less positive slope for the data plot. (a) will the equilibrium concentration of FeNCS^2+
Consider the system: CaCO3(s) saturated in 1.0 M H4NCl. Analyze this system by appropriate K, MB, and CB consideration in order to calculate pH and s(CaCO3). Assume volume stays 1L.
Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: C4H10O2: ? 1.36 (3H, d, J = 5.5 Hz); ? 3.32 (6H, s); ? 4.63 (1H, q, J = 5.5 Hz)
Consider the following chemical equation. Al(OH)3(s) + H2SO4(l) ? Al2(SO4)3(aq) + H2O(l) If 3.30 g of aluminum hydroxide reacts with 1.50 g of sulfuric acid, what is the mass of the water produced
What is the pH of a 0.0700 M solution of H2A? What are the equilibrium conecntrations of H2A and A^2- in this solution? pH = ? [H2A} = ? [A^2-] = ?
A 100L container has a 100g of ammonia gas and 50.0g of nitrogen gas at 500 degrees celcuis. Calculate the total pressure inside the container
How do the motions of horizontal projections with the same initial speed compare on the Earth and on the Moon? On what does the range of a projectile depend? Can a baseball pitcher throw a fastball in a straight, horizontal line? Why or why not?
Problem- CH3CH2CH2COCH2COCH2CH3 add NaOCH2CH3 and CH3I (twice) after adding the combo twice add H3O+/heat. What is the product of the double ketone after the three reactions
0.982 g sample of KHP (this is not potassium-hydrogen-phosphorus) is dissolved in water and titrated to the equivalence point with 26.45 mL of NaOH solution. What is the concentration (M) of the NaOH solution
The rate constants of some reactions double with every 10 degree increase in temperature. Presume that a reaction takes place at 340 K and 350 K. Explain what must the activation energy be for the rate constant to double as described
Question- The α-phenylethylamine recovered from the hydrogen tartrate salt that recrytallizes as needles have been found to have a specific rotation of -20°. What is the percent composition of this mixture (+) and (-) enantiomers.
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