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Chemistry

Which hybridization scheme occurs about nitrogen when nitrogen forms a double bond?

Carlton Burgess

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Which of the following is a radioisotope used to date rock formations older than 50,000 years old? A) carbon-12 B) uranium-235 C) cobalt-60 D) carbon-14 Any help is appreciated :)

William Cain

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Which of the following is not a form of energy? a. light b. pressure c. heat d. electricity

Jeffrey Rodriguez

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The windchill index tells you A. the temperature of the water during winter. B. the amount of moisture in the air. C. how wind and temperature affect your body in winter. D. how wind speed affects heating needs for structures

James Washington

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Which quantity of heat is equal to 200. joules? (1) 20.0 kJ (3) 0.200 kJ (2) 2.00 kJ (4) 0.0200 kJ

Rodney Fox

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Calculate the approximate enthalpy change, ΔHrxn, for the combustion of methane: CH4+2O2→2H2O+CO2 ΔHrxn from a given table: CH4 = 1656 kJ/mol O2 = 498 kJ/mol H2O = 928 kJ/mol CO2 = 1598 kJ/mol ΔHrxn = [(1656) + (2*498)] - [(2*928) + (1598)] = -802 kJ/mol ?

Zach Chandler

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Identify this symbol. cl-. 1)anion 2)cation 3)atom 4)molecule

Brandon Scott

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A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it? A. V B. Na C. Mg D. Se

Kristi Hammond

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Calculate the frequency of the n = 6 line in the Lyman series of hydrogen.

Kristi Hammond

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Which bond pair does not have a polar covalent bond? P – Cl O – H S – Cl H – Cl Cl – Cl

Amanda Johnson

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Which of the following is true about isopropyl alcohol? It is insoluble in water. It is completely odorless. It has a relatively high boiling point. It is white.

Ronald Miller

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What is the purpose of the scale on a map?

Whitney Matthews

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What is the net force f⃗ net that the dipole experiences due to the electric field?

Jessie Thompson

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Draw fischer projection for d-2-ketotetrose

Kathy Robinson

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Which option describes a similarity and a difference between isotopes of an element? A) same atomic number; different number of protons B) same number of protons; different atomic number C) same atomic number; different mass number D) same mass number; different atomic number E) same number of neutrons; same number of protons

Caroline Campbell

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If an acid and a base react, the product(s) will be _____.

Rodney Fox

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An unknown sample required 21.05 mL of 0.02047 M KmnO4 to reach the end point. How many moles of KmnO4 reacted?

Alexa Spicer

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Hikers have noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1.0 atm, temperature is 25°C, and the volume of the chip bag is 0.985 L. At the top of the mountain, the temperature is 22°C and the chip bag has puffed up to 1.030 L. What is the air pressure on top of the mountain?

Melissa Norris

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The transfer of heat by the movement of heated fluid is called conduction. Please select the best answer from the choices provided T F

Melissa Norris

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In part B of my question, I was asked calculate the number of atoms in 0.615 mol of 13C (mass number of this Carbon is 13). I received the correct answer of 3.70E23 atoms. However, I do not know how to do Part C of my question, which asks "Based on your answer in Part B, how many electrons are in this amount of 13C"? Similarly, Part D asks "how many neutrons are in this amount of 13C"? Thank you so much in advance!

Ross Pratt

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Determine the overall charge on each complex.a) tetrachlorocuprate(i)b) pentaamminechlorocobalt(iii)c) diaquadichloroethylenediaminecobalt(iii)

Daniel King

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What is the energy of one photon of light with a wavelength of 445 nm?

Justin Parker

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Classify each solid as a covalent, ionic, metallic, or molecular solid. Drag the appropriate items to their respective bins. HelpReset frozen ethanol calcium fluoride rhombic sulfur pure calcium

Nicholas Rivera

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Which best characterizes a crystal? a number of high speed particles moving randomly a dense substance that is hard and incompressible a high-energy state of matter made up of a swirling, ionized gas a loose association of particles moving past one another

Alexa Spicer

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What is the mass of 3.8 × 10^24 atoms of argon (ar)? 0.0039 g 0.16 g 6.3 g 250 g

Craig Stewart

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The (triangle)Hrxn of formation of carbon dioxide is negative. Which statement is true? The reaction is endothermic. The reaction is exothermic. The amount of carbon dioxide is more than the amount of reactants. The amount of carbon dioxide is less than the amount of reactants.

Zach Chandler

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____ is the transfer of energy in the form of rays or waves. a. Conduction c. Radiation b. Convection d. Condensation

Daniel King

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How much nitrogen-14 will be produced from a 200-g sample of carbon-14 after 17,190 years? Download png

Kyle Mckinney

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What is the percent by mass of carbon in c10 h14 n2?

Theresa Perry

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What will most likely happen if a sound wave moves from the air through a solid? a. it will increase wavelength b. it will decrease in speed c. it will increase in speed d. it will decrease in wavelength

Nicholas Rivera

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Which is the theoretical reason behind the framers favoring of a bicameral congress?

Nicholas Rivera

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Which of these liquids has the highest viscosity? A. Syrup B. Water C. Orange juice D. Milk

Caroline Campbell

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Which characteristics define a liquid?

Justin Parker

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The hydrogen ions released by the dissociation of carbonic acid are buffered by their ________.

Annie Barnes

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What does the name 2–butene tell you about this hydrocarbon's molecular structure? A.There are two carbon atoms and all single carbon bonds. B. There are two carbon atoms and a double carbon bond. C. There are three carbon atoms and a double carbon bond that starts on the second carbon atom. D. There are four carbon atoms and a double carbon bond that starts on the second carbon atom.

Melissa Norris

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Which two substances do geologists use in radiocarbon dating?

Theresa Perry

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How many iron atoms are contained in 354 g of iron?

Alexa Spicer

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How many moles of atoms are in 5.00 g of 13C

Jennifer Patterson

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Which group is likely to react with chlorine to form compounds in the form xcl?

Chelsea Hayes

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Which of the following is an example of a nonmetallic mineral? a. sulfur b. lead c. aluminum d. gold

Kyle Mckinney

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What coefficient of h+ balances the atoms in this half-reaction h+ + mno2 → mn2+ + h2o?

Nicholas Rivera

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forms when water is drawn away from the area between high tides

Zach Chandler

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Which type of condensation nuclei are most likely to cause clouds to form? a. smoke particles b. dust particles c. salt particles?

Donald Ward

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What is the element ar classified as in the periodic table?a noble gas halogen metalloid a metal

Ramon Kelly

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What is the number of atoms per unit cell for each metal?

Ronald Miller

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Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. NH4l, CoBr3, Na2SO4

Whitney Matthews

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What is always true of a combustion reaction? carbon dioxide will be produced the reaction absorbs energy oxygen gas must be one of the reactants one reactant must contain carbon

Annie Barnes

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Classify these definitions as that of an arrhenius acid, an arrhenius base, or other. g

Kevin Sutter

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Calculate the molar solubility of fe(oh)2 in pure water. (the value of ksp for fe(oh)2 is 4.87×10−17.)

Kaitlin Dean

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Atoms of what element form the backbone of large, complex molecules such as sugars and fats? A. carbon B. oxygen C. sodium D. sulfur

Jodi Brooks

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