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Problem: In the laboratory, a student performed an experiment in which the final length of a piece of wire was a significant measurement. In three separate experiments, the student found the length of wire after the experiment to be 23.50 mm, 25.0 mm, and 35 mm. Find the average of the three trials, to the correct number of significant figures, and decide if these measurements gave an accurate result.
Write an equation for the reaction of one molecule of ethylene glycol with one molecule of phathalic anhydride.
A mixture of ethanol and water is often used in a sponge bath to cool individuals with high temperatures. Ethanol is added to aid in the evaporation process which is primarily responsible in the cooling. What volume of ethanol (measured and applie..
.56 g of a specific gas are held at 101 degrees Celcius and 800 torr in a volume of 285 mL. Determine the molecular weight of the gas.
Given Data: average number of drops/mL = 73.0; overall average diameter of oleic acid film = 38.0 cm. Use this data to calculate following:
Magnesium combines with hydrochloric acid (HCI) to form the ionic compound magnesium chloride and hydrogen gas. - write the balanced chemical equation for this
Write the symbol for an atom of element X. Complete the table below to show the number of sub-atomic particles in both an atom and an ion of potassium. Which element is most likely to be in Group VI? Which element will form an ion of the type X2+. Wh..
Identify the elements that correspond to the following atomic numbers. label each as a noble gas ? a halogen ?an alkali metal? an alkaline earth metal? a transition metal? a lanthanide metal? or an actinide metala 17 b 4 c 63 d 72 e 2 f 92 g 55
Use the molar volume of a gas at STP to determine the volume (in L) occupied by 10.5 g of neon at STP.
Compute the ΔH° rxn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide.
The flame in a torch used to cut metal is produced by burning acetylene (C2H2) in pure oxygen. Assuming the cumbustion of 1 mole of acetylene released 1251 kJ of energy
Zn,Cd,Hg were placed with alkaline earth metals in Mendeleev's table. How this confusion is removed in the modern periodic table?
From the electronic configuration, forecast which of the first 10 elements would be most similar in chemical behavior to the as yet undiscovered element 217.
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