Chemistry

Help! With 22! And 21! Ill give brainliest. ASAP!
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2 C8H18 + 25 O2 16 CO2 + 18 H2OHow many moles of CO2 can form from 17.5 moles of octane?
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Instructions: Use the periodic table to answer the questions below:1) How many periods are there on the periodic table?2) How many groups are there on the periodic table?3) Which element is found in Group 2 and Period 3?4) Which element is found in Group 17 and Period 2?5) Which element is found in Group 10 and Period 4?6) Which element is found in Group 18 and Period 6?7) Which element is found in Group 1 and Period 7?8) Which element is found in Group 14 and Period 6?
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The nicotine molecule cannot make ionic bonds. Change nicotine into a different molecule, one that can now can make ionic bonds.
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LINKS WILL BE REPORTED // Need answers as fast as possible!- Electrons always fill orbitals in the same order. Each s orbital holds 2 electrons, each set of p orbitals holds 6 electrons, each set of d orbitals holds 10 electrons, and each set of f orbitals holds 14 electrons. The order in which orbitals are filled, from first to last, is:1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7pBeryllium has 4 electrons. What is the electron configuration of beryllium?A. 2s^22p^2 B. 1s^22s^2 C. 2s^4 D. 4p^1
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Question 6 of 10What could make AG become negative at a given enthalpy and entropy?A. Changing the temperatureB. Changing the concentrationsC. Changing the pressureD. Changing the volumeSUBMIT
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Someone please help me and thank you
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Hey guys so my cuz gave me this stone when he went to mexicocan u plz tell me what kind of stone this is?
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help me whith thisDescribe the processes of photosynthesis
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Organisms change energy from the environment or from their food into other types of energy. This is called what?
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(True or false) The blood carries hormones to target tissues around the body so the hormones can control the activity of those cells
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What is the formula to findmoles
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Which of the following is a conductor?a) Glassb) Woodc) Goldd) Oil
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A tube contains hydrogen and oxygen gas. Its total pressure is known to be 4.53 atm. It's the pressure of the hydrogen is 2.7 atm, what us the pressure of the oxygen in atm?
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If those same 25 grams are carbon are reacted, how many moles of carbon dioxide will be produced?
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A voltaic cell is assembled by using two 30-mL beakers. In one beaker, Ag metal is used as the electrode with 10 mL of 1 M AgNO3. In the other beaker, Zn metal is used as the electrode with 10 mL of 1 M ZnSO4. The beakers are connected with a salt bridge and the measured cell potential, Eocell, is 1.50 V. The Zn electrode is negative (anode). Which reaction takes place at the Zn electrode
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Which property increases as you move down a column in the periodic table?A) atomic sizeB) ionization energyC) nonmetallic characterD) none of the above (all increase as you move down a column).
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An organism whose cell contains a nucleus.
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How many grams of Si are there in a sample of Si that contains the same number of moles as a 60.8 gram sample of P?
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What is true about a car with constant velocity?A. It has a zero acceleration B.It has a changing direction C.postive acceleration D. Negative acceleration
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A container at equilibrium contains the following concentrations: [Hz] - 0.30 M and [HI]0.90 M. The equilibrium constant is equal to 6.0. What is the concentration of I2 atequilibrium?Hzig) + 1218 = 2 Hle)
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Pick one answer do not put any links please
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You had a closed tank of air at a pressure of 4 atm and temperature of 20 degrees Celsius. When the tank and the air are heated to 40 degrees Celsius, what is the pressure if the volume remains constant?
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Do you think it is a good idea for all scientists to use the same periodic table of elements? Why or why not?
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