Chapter 2 22. A student heats 0.5585 g of iron with 0.3550 g of sulfur. She reports that she obtains 0.8792 g of iron sulfide and recovers 0.0433 g of unreacted sulfur. Show by calculation whether or not her results obey the law of conservation of mass. Total mass initial = 0.5585 g + 0.3550 g = 0.9135 g Total mass final = 0.8792 g + 0.0433 g = 0.9225 g These two values should be equal by the law of conservation of mass. These results do not obey the law of conservation of mass. Possibly she
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Purpose Using a calorimeter‚ the experiment aimed to determine the specific heat of two different metals‚ Lead and Zinc‚ in order to calculate their individual atomic weight. Theory The calorimeter consists of a metal outer cup‚ a removable metal inner cup‚ which is held in place by a rubber ring‚ and an insulating lid with a small opening for a thermometer. It is a closed system as the air between the inner cup and outer cup insulates the water and heated metal‚ so‚ ideally‚ all heat is contained
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bEAN BAG ISOTOPES:ABUNDANCE AND ATOMIC MASS LAB By: Catriona Whalley Partner: Ming Siegel Due: 1.14.10 Prelab A new atomic theory‚ in which all atoms of the same element are identical to one another and equal in mass‚ was proposed by the scientist Dalton. Although the theory had its flaws and was simple‚ it was revolutionary. Scientists became able to study the actual structure and mass of atoms after the discovery of radioactivity. Soon‚ isotopes were discovered‚ as atoms of the same element
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CHM130 Lab 5 The Atomic Mass of Beanium Name: Paige Miller A. Data Table: Insert your Data Table here with your sample calculations. You must show at least one sample calculation per procedure step. (16 points) Part I Data Table Sample Mass (mg) Number/Qty Average Mass (mg) Relative Abundance Relative Weight (mg) Kidneybeanium 1660.00 mg 3 553.33 mg 0.2143 118.58 mg Pintobeanium 2830.00 mg 6 471.67 mg 0.4286 202.16 mg Blackeyedpeaium 1110.00 mg 5 222.00 mg
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Abstract In the Lab Determining the Empirical Formula of Magnesium Oxide‚ students set out to find if there is a true 1:1 ratio in the empirical formula of MgO. This was determined by burning the Magnesium until a white smoke started to protrude. This showed the reaction of Oxygen combining with Magnesium to form Magnesium Oxide. This was then measured again and turned out to be slightly heavier than the measurement before. This added weight is Oxygen‚ forming the combustion of Magnesium Oxide.
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moles of wanted substance to desired units. Converting from Grams to Moles NOTE: One mole of anything contains 6.022 x 1023 atoms Atomic weights on the periodic table are given in terms of amu (atomic mass units)‚ but‚ by design‚ amu correspond to the gram formula mass. In other words‚ a mole of a 12 amu carbon atom will weigh 12 grams. The gram formula mass can be used as a conversion factor in stoichiometric calculations through the following equation: Moles = Converting between Volume
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̅ E. sulfate ion = SO42 ̅ 5 How many molecules are in 0.25 mole of Na2O? A. 4.5 × 10(23) B. 0.75 C. 1.5 × 10(23) D. 4.2 × 10( ̅ 25) E. 0.25 6 Calculate the molar mass of Na2SO4. A. 94.05 g/mol B. 71.06 g/mol C. 142.05 amu D. 142.05 g/mol E. 94.05 amu 7 If 4.05 × 1023 molecules of a substance have a mass of 86.2 g‚ what is the molar mass of the substance? A. 128 g/mol B. 3.49 × 1025 g/mol C. 2.13 × 1022 g/mol D. 4.70 × 1021 g/mol E. 58.0 g/mol 8 A 6.25 g sample of magnetite
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BEAN BAG ISOTOPES:ABUNDANCE AND ATOMIC MASS LAB Prelab A new atomic theory‚ in which all atoms of the same element are identical to one another and equal in mass‚ was proposed by the scientist Dalton. Although the theory had its flaws and was simple‚ it was revolutionary. Scientists became able to study the actual structure and mass of atoms after the discovery of radioactivity. Soon‚ isotopes were discovered‚ as atoms of the same element which have been built up to have different masses. Purpose
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Negligible (too small to count) What is the mass of an electron? 1 AMU or g What is the mass of a neutron? Increasing atomic number Elements on the periodic table are arranged in order of … # of electrons = # of protons What is the relationship between protons and electrons? 2 How many electrons can the first
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BIOL 101 September 15‚ 2012 Assignment 1 Chapter 1 2. What is Homeostasis‚ and why is it important? Give some examples that show how systems work together to maintain homeostasis? Homeostasis is a term used to describe an internal environment being in a state of constant conditions‚ such as constant temperature‚ pH‚ and etc. It is important because staying at an equilibrium requires the least amount of energy and provides the perfect environment for desired reactions to occur. If at any given
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