What is the relationship between the vapor pressure of a
Question What is the relationship between the vapor pressure of a liquid and its boiling point?
Balance the following reaction showing both correct half-reactions and ALL
Question Balance the following reaction showing both correct half-reactions and ALL your work below: Mn 7 ClO3- → ClO4- Mn 2Step 1: Write two half-reactions for the equation:Oxidation Reaction:Reduction Reaction: Step 2: Balance elements other than H and O in each half-reaction. Add H2O to the side that needs O and add H to the side that needs H.Oxidation Reaction: Reduction Reaction: Step 3: Balance each half-reaction for charge by adding electrons to the side with more positive charge.Oxidation Reaction: Reduction Reaction: Step 4: Multiply each half-reaction by factors that equalize the loss and gain of electrons. Oxidation Reaction: Reduction Reaction: Step 5: Add balanced half-reactions, cancel electrons, and combine H2O and H . Check balance of atoms and charge.
Question 1: Part a: style=”color:rgb(0,0,0);”>Which of the following reactions will
Question Question 1: Part a: style=”color:rgb(0,0,0);”>Which of the following reactions will be spontaneous? a. Pb 2 Zn → Zn 2 Pb b. Mg 2 Ni → Mg Ni 2 c. both of these will be spontaneous d. none of these will be spontaneous Provider a rationale for your answer: Part b: In which reaction is Zn being oxidized? a. 3 Zn 2 FeCl3 → 3 ZnCl2 2 Fe b. ZnCl2 Mg → MgCl2 Zn c. ZnCl2 CuSO4 → ZnSO4 CuCl2 d. All of these Provider a rationale for your answer: Part c: Which of the following metals have the greatest tendency to lose electrons? a. Cr b. Sn c. Mg d. Ag Provider a rationale for your answer:
The solubility of water in diethyl ether has been reported
Question The solubility of water in diethyl ether has been reported to be 1.468 % by mass.’ Assuming that 23.0 mL of diethyl ether were allowed to become saturated with water before used and that the 1.2 g magnesium was the limiting reagent, what percentage of the product is expected to be lost due to the water in the solvent if the ether is not anhydrous? ATTACHMENT PREVIEW Download attachment IMG_6830.JPG
Recall that we were trying to produce a compound that
Question Recall that we were trying to produce a compound that absorbed strongly in the UVA region of the spectrum. The Amax values for dibenzalacetone (mixture of E/Z isomers) in ethanol was reported in 1986. Using Reaxys, answer the following questions: published? (3 pts) What is the title of the journal in which this article was (3 nts) What is the wavelength of maximum absorption in ethanol according to this study? ATTACHMENT PREVIEW Download attachment IMG_3896.JPG
Preparation of Solution
Question Preparation of Solution
For this assignment I am to conduct a hazardous chemical
Question For this assignment I am to conduct a hazardous chemical briefing/presentation at my work: This presentation is on silica (in its crystalline form) which causes silicosis if inhaled which is a major hazard in the construction industry. I am not sure if this would be considered a hazardous chemical or if it will fit for the questions I must answer during my presentation. If it is not, I will chose something else so please let me know either way.Note: I have already completed questions 1-5 to the best of my ability. I’m looking to verify my work and make sure I have done this assignment correctly. As for question #6 I am completely lost, any help with this question would be greatly appreciated. 1.) Please explain and show the molecular structure of silica or Silicon dioxide: (I’m looking for the natural crystalline form found in construction, that causes silicosis). and or, the element Silicon and their relationship if that is easier or different.2.) Identify the type of molecule for silica or Silicon dioxide? (Ionic or Covalent)3.) Identification of whether the molecule is polar or non-polar?4.)Relation of its chemical behavior to its structure?5.) If it is a large molecule, the identification of one central atom and its VSEPR shape?6.) Identification of at least three bonds within the molecule and their bond lengths and enthalpies?
1) Which of the following is true of science?1) it
Question 1) Which of the following is true of science?1) it does not change once a law is discovered.2) it reflects the personal opinions and beliefs of scientists.3) it is a body of knowledge gained using inquiry and experimentation.4) it can be disproven by philosophy or religion. 2) Why are questions about philosophy or religion not able to be answered through scientific inquiry? Be specific and use examples to support your answer. 3) Which of the following is an example of a true science? 1) phrenology2) philosophy3) geology4) astrology 4) Which statement is the best example of pseudoscience? 1) Scientists have observed many constellations in our universe.2) The moon’s gravity and movement affect the ocean’s tides.3) Katie thinks her astrological sign, Libra, is a perfect fit for her personality.4) Gary thinks that soil samples from Mars indicate that the planet once had water. 5) A weight loss supplement is advertised in several popular beauty and fashion magazines. The advertisements claim that “the supplement can help anyone lose up to 2 inches off their waist in 60 days.” What would be the best way to increase the scientific reliability of this claim?1) Advertise at local fitness clubs and in fitness magazines.2) Find a famous actor or actress to endorse the product.3) Include before and after photos in the advertisement.4) Have the product tested by an independent organization. 6) Which of the following does not contribute to the strength of a scientific theory? 1) the consideration of alternative scientific explanations to explain the data2) using creativity to develop various experiments to test a hypothesis3) scientific argumentation and questioning of the results of an experiment4) the fact that the scientists responsible for testing the hypothesis are already famous 7) Environmental scientists and biologists investigate air pollution in an area and predict possible health issues that will affect the population. Having scientists with different backgrounds and expertise investigating the same situation means that there can be differing or competing inferences and explanations.How will this affect the predictions made by the group of scientists?1) It will strengthen the prediction by adding new perspectives and ideas for experiments.2) It will strengthen the prediction by adding more opinions from which to choose.3) It will weaken the prediction by adding confusion with too many different opinions.4) It will weaken the prediction by producing conflict and competition between the scientists. 8) The atomic theory has been revised many times over the last several hundred years. John Dalton described the atom as a solid sphere while later scientists such as J.J. Thomson and Ernest Rutherford developed different models of the atom.Why has the atomic theory changed so much over the last several centuries?1) A new scientific method helps scientists form more efficient theories and models.2) The atom has changed over time, and new theories must reflect those changes.3) As new discoveries are made, existing theories are revised or replaced.4) Scientists with different opinions look for evidence to support their theories. 9) Which of the following is an example of a scientific inference?1) The butterfly has bright colors that make it easy for me to see when it lands on a plant.2) The insect probably released a sticky liquid because it is upset and trying to defend itself.3) The ants live in colonies and they follow trails to find possible food sources.4) The bee stung me on the arm after I waved my hands trying to scare it away. 10) A scientist in California conducted a series of experimental investigations to test the effect of radiation on plant growth. Another scientist repeats the investigations, which produce similar results. This is important because 1) it encourages competition within the scientific community.2) different scientists apply different beliefs and opinions to data interpretation.3) the investigation and results are more reliable if the results can be reproduced.4) it helps scientists to prove facts when they make sure their results match.
11) In order for a scientific theory to be developed,
Question 11) In order for a scientific theory to be developed, it is examined and re-examined through experiments and scientific argumentation. This process makes the scientific theory1) stronger and more durable.2) weaker and easier to discredit.3) unable to be argued or disproven.4) controversial and of little use to the public. 12) Which of the following is true of a scientific theory?1) It attempts to explain why things happen the way they do.2) It never changes once it is discovered.3) It is tested over time until it becomes a scientific law.4) It only describes what happens, not why it happens. 13) Which of the following is an example of a scientific theory?1) Scientists use three mathematical laws to predict the movement of planets in the solar system.2) Scientists observe the effect of climate changes on plants and primary producers living in the ocean.3) Scientists use the relationship between the DNA of various species to estimate how long ago they diverged evolutionarily from each other.4) Scientists agree that there is an amount of attraction between any two objects, called gravity, and can describe the attraction in mathematical terms. 14) Observation and experimentation have led many scientists to accept a theory about the origin of the universe. This theory is called the Big Bang Theory. Scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. What makes this a scientific theory? 1) It is built on investigations by many scientists in order to provide a strong and testable explanation.2) It has been proven by several scientists independently, resulting in its being accepted as truth.3) It is based on the beliefs and opinions of the majority of the scientific community.4) It has been proven to be scientific fact through all the experiments and investigations. 15) What is not true of a scientific law? 1) It must be verified by scientists around the world.2) It attempts to explain why things happen.3) It describes what happens in the world around us.4) It must be supported by many independent scientific investigations. 16) What property of matter are you measuring if you are using a triple beam balance? 1) volume2) gravity3) mass4) size 17) Which of the following is not an example of potential energy? 1) chemical energy2) gravitational energy3) mechanical energy4) nuclear energy 18) Which of the following best represents potential energy being converted to kinetic energy?1) The chemical energy in a battery is used to power a radio.2) The movement of wind turns a windmill that generates electricity.3) A girl rides her bicycle across town to her friend’s house.4) A man jogs around the block and then stops for a drink of water. 19) Which of the following measures the average kinetic energy of a substance? 1) Density2) Mass3) Temperature4) Volume 20) As the temperature of a gas in a closed container increases, what is true of the particles in the substance? 1) the rate of movement increases2) the distance between them increases3) the attraction between them decreases4) the rate of reaction decreases
21) Students were asked to measure a string as part
Question 21) Students were asked to measure a string as part of a physics experiment. The actual length of the string was 7.35 cm long. Which of the following groups of data show measurements from the most accurate group and why?1) 7.35 cm, 7.82 cm, 7.12 cm, because one of the measurements is closest to the actual length.2) 6.95 cm, 6.93 cm, 6.97 cm, because these have the most agreement between the measurements.3) 7.32 cm, 7.37 cm, 7.39 cm, because this group’s measurements are closest to the actual length.4) 7.90 cm, 7.91 cm, 7.89 cm, because these have the most agreement between the measurements. 22) How many significant figures are in the measurement 0.0002050 kilograms?1) 72) 43) 34) 2 23) Which of the following best explains why the atomic theory has changed over the past 200 years? 1) The atomic theory was terribly flawed.2) Few people believed it was correct.3) The early atomic model was never accepted.4) New experiments led to revised ideas. 24) Many scientists have contributed to the current accepted atomic model. Which of the following would be a reasonable description of this current atomic model?1) The model has changed very little over its entire history.2) The model gradually changed as new scientific data was gathered.3) The model is virtually complete and is unlikely to change much.4) The model quickly and rapidly changed until technology caught up. 25) The deflection of alpha particles in Rutherford’s gold foil experiments resulted in what change to the atomic model?1) the addition of energy levels and orbitals to the electron cloud2) the addition of a small, dense nucleus to the center of the atom3) the addition of wave properties to the characteristics of an electron4) the addition of neutrons to the nucleus of the atom 26) Describe Rutherford’s gold foil experiment and how the experimental results led to specific changes in the accepted model of the atom. Be sure to include a description of the atomic model that was accepted by the scientific community before this experiment as well as the atomic model that was accepted after this experiment. 27) A neutral atom has an atomic number of 14 and a mass number of 30; how many protons, neutrons, and electrons are found within the atom?1) 30 protons, 14 electrons, and 30 neutrons2) 14 protons, 14 electrons, and 16 neutrons3) 14 protons, 16 electrons, and 16 neutrons4) 30 protons, 30 electrons, and 14 neutrons 28) An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion?1) mass number: 24, charge: 22) mass number: 22, charge: neutral3) mass number: 34, charge: -24) mass number: 34, charge: 2 29) Which of the following atoms has the same number of neutrons as an atom of Aluminum-27? 1) Silicon-272) Sulfur-303) Chlorine-174) Phosphorus-31 30) The atomic and mass numbers for four different atoms are given below. Which two are isotopes?Atom AtomicNumber MassNumber W 50 117 X 50 119Y 51 119Z 52 1171) W and X2) X and Y3) W and Y4) Y and Z 31) How many atoms of gold (Au) are present in a sample of 2.5 mol Au? 1) 1.5 × 1024 atoms Au2) 1.5 × 1023 atoms Au3) 4.2 × 1024 atoms Au4) 4.2 × 1023 atoms Au
Experiment is called Diffusion of Gases and Graham’s Law />
Question Experiment is called Diffusion of Gases and Graham’s Law /> ATTACHMENT PREVIEW Download attachment 30.png 1. Describe the safety precautions that you must 4. A diffusion rate study was done using a 75-cm take when you work with concentrated HCI and con- glass tube, NHg gas, and an unknown gas that reacts centrated NH,OH solutions. with NH3 to form a white precipitate. In 340 s the NHg traveled 55 cm and the unknown gas traveled 20 cm. (1) Calculate the rate of diffusion, in cm s-1, of NH3- 2. Gas A has a density of 0.20 g L-1, and gas Bhas a (2) Calculate the rate of diffusion, in cm s-1, of density of 0.80 g L-, both at the same specific tem- the unknown gas. perature and pressure. Which gas will diffuse faster? Briefly explain. (3) Calculate the molar mass of the unknown gas. 3. Arrange the following gases in order of increasing rates of diffusion: O2, He, Cl2, NH3, Xe, and N2. Briefly explain the basis of the order you chose. (4) Was the unknown gas HI, HBr, or HaS? Briefly explain.
32) Which of the following samples has the greatest mass
Question 32) Which of the following samples has the greatest mass of iron?1) 3.8 mol Fe2) 7.0 × 1023 atoms Fe3) 42.0 g Fe4) 1.8 mol Fe 33) What occurs when an excited electron returns to its ground state? 1) the nucleus decomposes and emits nuclear energy2) energy is emitted as photons of light3) the electron combines with a proton in a chemical reaction4) the electron is available to bond with other atoms 34) How are the frequency and energy of an electromagnetic wave related?1) As frequency increases, energy increases2) As frequency increases, energy decreases3) Energy remains constant as frequency changes4) Energy and frequency are not related 35) In which region of the periodic table would an element with the electron configuration below be located?1s22s22p63s23p64s23d4 1) halogens2) transition metals3) alkali metals4) noble gases 36) What would be the most likely charge of an ion formed from an atom with the electron configuration:1s22s22p4 1) 12) -13) 24) -2 37) The modern periodic table arrangement is a result of all of the following except1) many scientists who contributed individual knowledge.2) total rejection of the early versions for modern ideas.3) much scientific reexamination and argumentation of ideas.4) periodic repetition of the chemical and physical properties of the elements. 38) Which answer best explains how the periodic table was reorganized over time?1) The modern periodic table evolved rapidly and quickly because many elements were easily discovered.2) More modern tables were created by scientists who were working for fame and monetary reward.3) Science continually changes and new laws, theories, and models must always replace older ones.4) The accepted version of the periodic table was replaced when investigation resulted in new knowledge. 39) Magnesium (Mg) will have chemical properties most like 1) manganese (Mn).2) calcium (Ca).3) sodium (Na).4) aluminum (Al). 40) Which of the following ordered pairs of elements shows an increase in atomic radius but a decrease in atomic number?1) Be and Li2) Na and K3) Ne and Ar4) O and F 41) Which of the following compounds will experience hydrogen bonding?1) NH32) HBr3) C2H44) H2SO4 42) Which of the following compounds contains both ionic and covalent bonds?1) KOH2) N2O53) CH3OH4) Na2O
43) What is a possible formula of a compound formed
Question 43) What is a possible formula of a compound formed when sodium and chlorine bond? />1) NaCl42) NaCl33) Na2Cl34) NaCl 44) Which of the following compounds contains a double bond?1) O22) H2O3) Cl24) NCl3 45) Draw the Lewis structure for each of the following compounds and ions. Which one experiences delocalized electrons, or resonance?1) HCN2) NH33) CO24) O3 46) What is the name of the acid with the formula H2SO3?1) sulfuric acid2) hydrosulfuric acid3) sulfurous acid4) hydrosulfurous acid 47) What is the name of the compound Sn(CO3)2?1) tin (IV) carbonate2) tin carbonate3) tin (II) carbonate4) tin bicarbonate 48) What is the molar mass of Pb(ClO3)2? 1) 409.6 g/mol2) 374.1 g/mol3) 338.6 g/mol4) 290.7 g/mol 49) The statement “the iron rusted in water” describes a1) chemical property.2) physical property.3) chemical change.4) physical change. 50) The ability of sodium chloride to dissolve in water is an example of a1) chemical property.2) chemical change.3) physical property.4) physical change. 51) The boiling point and color of a substance are both examples of1) intensive properties because they depend on the amount of matter in the sample.2) intensive properties because they do not depend on the amount of matter in the sample.3) extensive properties because they depend on the amount of matter in the sample.4) extensive properties because they do not depend on the amount of matter in the sample. 52) When the following reaction is balanced with the lowest possible whole number coefficients, what is the coefficient in front of the calcium oxide (CaO)?Ca3(PO4)2 PbO2 CaO Pb3 (PO4)4 1) 22) 33) 64) 8
Coal has 5 % impurities of lime, 6 % impurities
Question Coal has 5 % impurities of lime, 6 % impurities of sand, and 7 % impurities of pyrite. Calculate volume of gases at 200 degree C and pressure 750 mmHg, formed after burning 1 kg of this coal. Products of pyrite combustion are ferric oxide and sulfur dioxide.
53) Referring to an activity series, which of the following
Question 53) Referring to an activity series, which of the following combinations of reactants would not produce a successful single-replacement reaction?1) Zn CuSO42) Ca MgSO43) Ag SnSO44) K Na2SO4 54) Write the complete balanced equation for the reaction between FeCl3 and MgO. 55) Which of the following is a product formed when LiClO3 decomposes? 1) O22) Li2O3) Cl2O4) Li 56) Which of the following is a product formed when CO2 and H2O react together?1) H22) O23) CO34) H2CO3 57) Write the complete balanced equation for the reaction that occurs when CH4combusts in O2. 58) If 23.4 grams of hydrogen gas were produced by the reaction below, how many grams of aluminum chloride were produced?2Al 6HCl 2AlCl3 3H21) 516 g AlCl32) 774 g AlCl33) 1030 g AlCl34) 1550 g AlCl3 59) When 10.3 mol Na react with 11.5 mol HCl, what is the limiting reactant and how many moles of H2 can be formed?unbalanced equation: Na HCl NaCl H21) Na is the limiting reactant, and 5.15 mol H2 can be formed2) HCl is the limiting reactant, and 5.75 mol H2 can be formed3) Na is the limiting reactant, and 3.43 mol H2 can be formed4) HCl is the limiting reactant, and 3.83 mol H2 can be formed 60) If the reaction of 3.75 moles of lithium with excess hydrofluoric acid produced a 96.5% yield of hydrogen gas, what was the actual yield of hydrogen gas?Unbalanced equation: Li HF LiF H21) 0.92 mol H22) 1.81 mol H23) 1.88 mol H24) 3.62 mol H2 61) If 7.65 grams of iron (III) oxide react with 6.85 grams of carbon monoxide to produce 5.10 g of pure iron, what are the theoretical yield and percent yield of this reaction? Be sure to show the work that you did to solve this problem.unbalanced equation: Fe2O3 CO Fe CO2
1) What is the energy of a photon if its
Question 1) What is the energy of a photon if its wavelength is 1.00 meter? I need to know how they arrived at the answer of the problem showing explanations.
Can someone please explain the resonance structures for SO2
Question Can someone please explain the resonance structures for SO2
Could you help me balance this equation? H^ (aq) Cr(s)→H2(g) Cr^2 (aq)
Question Could you help me balance this equation? H^ (aq) Cr(s)→H2(g) Cr^2 (aq)
I’m just looking for Lewis Diagram Sketching assignment how can
Question I’m just looking for Lewis Diagram Sketching assignment how can I find it?
what is the order of the phase changes that occur
Question what is the order of the phase changes that occur depending on the phase diagram of water under the following conditions:1- Water vapor originally at 200 atm and 150°C is slowly allowed to expand at a constant temperature until the final pressure is 0.005 atm.2- Water originally at 100.0°C and 0.50 atm is cooled at a constant pressure until the temperature is -100°C. ATTACHMENT PREVIEW Download attachment chem.jpg
If the magnet loses its superconducting properties, all of the
Question If the magnet loses its superconducting properties, all of the liquid helium could suddenly turn to a gas. If an MRI machine contains 1950 L liquid He with a density of 0.125g/mL, how many liters of He gas would be formed at 25°C and 1 atm? Use the ideal gas law. Round your final answer to two significant figures. Show your work
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