Invention of barbed wire Introduction of windmills Expansion of railroad lines A Texas History teacher wrote these bullet points on the whiteboard. What was the most likely topic of discussion? A Scientific Discoveries in Agriculture В The Close of the Frontier C Availability of Communication D. Improvement of Transportation

Q: Which of the following is NOT one of the elements important for life? (MARK ALL THAT APPLY) oxygen…

A: The six element necessary to all loving organism is Carbon , Hydrogen , Nitrogen, Oxygen,…

Q: Can be more than one answer

A: This answer is given below.Explanation:

Q: 20KJ In a certain photodissociation, 4.19 × 10 of energy is absorbed. If 2 = 450. nm, many photons…

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Q: I'm not sure how to answer this question. The correct answer is in red.

A: Heat in kilojoules, specific heat capacity, temperature difference and the calculated mass are…

Q: XeF₂ has 22 valence electrons. How many total electrons are in the Xe expanded outer shell? 8 Submit…

A: To solve this problem we have to find the valence electrons of xenon.

Q: g. Chromous hypochlorite h. Strontium phosphate i. sodium sulfate

A: Since you have posted a question with multiple subparts, we can answer only first three subparts.…

Q: Calculate the percentage by mass of lead in PbCO3. 73.05 89.22 17.96 77.54

A: We have to calculate the percentage by mass of lead in PbCO3.

Q: Using the information in the table below, calculate the heat of released from the following reaction…

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Q: Liquid hexane (CH, 3(CH,) CH,) will react with gaseous oxygen (0,) to produce gaseous carbon dioxide…

A: The reaction taking place can be written as (C6H14 = CH3(CH2)4CH3 = hexane), => C6H14 + O2…

Q: I'm not sure how to answer this question. The correct answer is in red.

A: The expression of density with temperature and pressure can be derived from ideal gas equation.

Q: Rank the following from smallest (1) to largest (6) mitochondria enzyme eukaryotic cell…

A: To rank the following from smallest to largest. mitochondria -  enzyme -  eukaryotic cell -…

Q: O ELECTRONIC STRUCTURE AND CHEMICAL BONDING Recognizing exceptions to the octet rule Decide whether…

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Q: One of the buffers that contributes to pH stability in human blood is carbonic acid (H2CO3).…

A: If the pH of the blood increases the buffer will act in such a way that reduces the pH. It is the…

Q: The Lewis Dot Structure rule states that S=N-A. Recall that N represents the TOTAL number of valence…

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Q: A new element was found to have an 8p4 level in its electronic configuration. What can be said about…

A: Yes, the answer is correct. When an element has unpaired electron in its configuration then it shows…

Q: I'm not sure how to answer this question. The correct answer is in red.

A: The molality of a solution can be calculated as given below.

Q: A mixture of gases is prepared from 69.9 g of O2 and 13.4 g of H2. After the reaction of O2 and H2…

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Q: Based on their positions in the periodic table, which of the following bonds is the most polar? A) C…

A: Polarity of bonds in terms of electronegativity of the atoms bonded together is given by…

Q: %3D 36. Which of the following is the most stable conformation of cis-1-ethyl-3-…

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Q: I don't know how to answer this question. The correct answer is in red.

A: The required relation is given below.

Q: A chemical bond involving carbon and hydrogen (C-H) is present in many biological the bond could be…

A: We are given that a chemical bond is involved between Carbon and Hydrogen which is present in many…

Q: ) Identify each of the following half-reactions as either an oxidation half-reaction or a reduction…

A: Given : We have to write complete balance redox reaction.

Q: Liquid octane (CH, (CH3(CH,) CH,) will react with gaseous oxygen (0,) to produce gaseous carbon…

A: Chemical Reaction would be :  C8H18 + O2 --> CO2 + H2O  Mass of O2 = 46.0 g Mass of C8H18 = 100.0…

Q: 5. 60.0 mL of 0.322 M Potassium lodide (Pbl,) are combined with 20.0 mL of 0.530 M lead (II) nitrate…

A: Given data, The balanced chemical equation is given below, Molarity of lead (II) nitrate = 0.530 M…

Q: For the calculating change in pH question, some of the volumes of acid required were very very…

A: As no equipment is available so measure and transfer very small volume of acid. So we need to use…

Q: How many grams of solid sodium cyanide should be added to 1.50 L of 0.172 M hydrocyanic acid…

A: The given data contains, Volume of HCN =1.50 LMolarity of HCN =0.172 MpH =8.570

Q: What is the stereochemical relationship between the organic products of the following reaction? Br…

A: The options are as follows:

Q: How many grams of water are produced by 1.0 moles of C3H8? C3H8 + 5 O2 → 3 CO2 + 4 H2O

A: 1.  Propane reacts with oxygen to forms carbon dioxide and water. The equation for the balanced…

Q: How do the presence or absence of partial charges at the molecular šcálė help explaln a liquiu 3 ADy…

A: The polar compounds have partial positive and negative charges, due to the electronegativity…

Q: Chemistry Reaction Rates #2 Name: Per: 1. For the reaction: 2 A + 3B → 4C + 5 D, the rate of the…

A: Rate of reaction can be written as :

Q: Please color the answer

A: If you further need clarification, comment please Thanks

Q: I'm not sure how to answer this question. The correct answer is in red.

A: Reactions are usually either endothermic or exothermic nature. They require heat for performing…

Q: Which one of the following complexes has a spin of S = 2? A. trans-Ni(H2O)4CI2 B. [Co(CN)6]3- C.…

A: Co-ordination compounds are formed when the metal ion is bonded to the ligand which donates its…

Q: When table salt dissolves in water, which of the following is/are true? (MARK ALL THAT APPLY) The…

A: When NaCl is dissolved in water then it dissociated into Na+ and Cl-,

Q: why water is good at dissolving salts?

A:

Q: Rank the following species in order of increasing number of valence d electrons: Pt(II), Mn(VII),…

A: Electronic configuration: It can be defined by saying that the distribution of electrons in the…

Q: How many isomers (include geometric and optical) are there for an octahedral complex where the metal…

A: Given : the molecule is octahedral complex and four different monodentate ligand and one bidentate…

Q: A colored flame is observed when a wire loop with a small sample of a solution containing a metal…

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Q: How do the presence or absence of partial charges at the molecular scale help explain a liquid's…

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Q: What is the molarity of a NaOH solution that is prepared by mixing 50.0 mL of 0.350 M NaOH with 125…

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Q: 22. Which of the following structures has a different configuration from the other three? HC HO H;C…

A: The configurations of the given compounds must be determined first.

Q: I'm not sure how to answer this question. The correct answer is in red.

A: The pressure at normal boiling point is 1 atm according to the definition of normal boiling point.…

Q: 18 Multiple Choice Which of these statements BEST explains the relationship between partial charges…

A: 18. Option a is correct that is stronger the partial charges, the stronger the attraction between…

Q: In a cell, the activation energy needed for a reaction to occur is likely lowered b a localized…

A: Activation energy is the minimum amount of extra energy required by a reacting molecule to get…

Q: Given the, antimony (III) ion Match each of the following with its correct answer The number of…

A: Given here antimony(III) ion and we are asked to match the correct answers.Note : atomic number of…

Q: What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7? O 1 x 10-7…

A: pH = -log(H+) So, H+ = 10-pH

Q: 19. What is the IUPAC name of the following compound?

A: