Answers created by Manish Bhardwaj

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• How much heat does 32.0 g of water absorb when it is heated from 25.0 to 80.0 °C?
  
• What allows the formation of a positive ion?
  
• What is 0.507 atmospheres pressure in kilopascals?
  
• The atomic number is the number of what?
  
• Question #feeeb
  
• What are the values of n and l for the last subshell of Na (Z=11) and B (Z=5)? What are their shapes?
  
• Question #b9477
  
• The volume of a gas is 0.400 L when the pressure is 2.00 atm. At the same temperature, what is the pressure at which the volume of the gas is 2.0 L?
  
• What are the 2 purine bases and the 2 pyrimidine bases?
  
• How would you balance the complete combustion of acetylene by oxygen gas in a constant-pressure calorimeter?
  
• What is the name of the compound that contains one uranium atom and six fluorine atoms?
  
• A helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 20.0°C is released. What volume will the balloon occupy at an altitude where the pressure is 0.600 atm and the temperature is -20.0° C?
  
• What units can measure mass?
  
• Question #0ebb5
  
• How many total atoms are in .660 g of #P_2O_5#?
  
• A 0.310 mol sample of xenon gas has a volume of 22.0 L at a pressure of 0.470 atm. What is the temperature of the gas in degrees Celsius?
  
• How do bases usually taste?
  
• What is the pH of a 0.0235 M #HCl# solution?
  
• In what order do electrons fill orbitals within a sublevel?
  
• In the reaction represented by the equation #2Al_2O_3 -> 4Al + 3O_2#, what is the mole ratio of aluminum to oxygen?
  
• How many moles of #Cl# are in 2.7 mol #CaCl_2#?
  
• How do you divide #(4x^2-2x+6) div (2x-3)#?
  
• What is the empirical formula of a phosphoric acid that contains 0.3086 g of hydrogen, 3.161 g of phosphorus, and 6.531 g of oxygen?
  
• An exothermic reaction releases 80.5 J of energy. How many calories of energy are released in the reaction?
  
• What is the mass of 5.99 mole of carbon monoxide?
  
• Question #04d42
  
• What is the percent composition of a compound with the empirical formula #MgCl_2#?
  
• The pressure of a gas is 1.34 atm at a temperature of 298 K. What will the pressure be if the temperature is increased to 512 K?
  
• A hot air balloon has a volume of 500.0 L. At what temperature is the gas if there are 25 moles present at standard pressure?
  
• How many moles of magnesium oxide are formed when 4 moles of magnesium react with oxygen in the reaction #2Mg + O_2 -> 2MgO#?
  
• During what type of phase change does a substance release energy to its surroundings?
  
• How do you convert a pressure of 1.75 atm to kPa and to mmHg?
  
• Question #e9190
  
• What is the atomic number for the tin?
  
• Question #4badc
  
• How many moles of #CaBr_2# are in 5.0 grams of #CaBr_2#?
  
• Is a solution a homogeneous mixture or a heterogeneous mixture?
  
• A gas has a volume of 3.3 L at 25°C and 1.3 atm; at what temperature would the gas occupy 2.5 L at 1 atm?
  
• A solution consists of 200. g of a nonelectrolytic solute dissolved in 500. g of water. It freezes at -9.30°C. What is the molecular weight of the solute?
  
• What are cycloalkanes used for?
  
• What is the percent composition of CO2?
  
• What is the molarity of a solution that contains 17 g of #NH_3# in .50 L of solution?
  
• How many microliters are in 41.0 mL?
  
• What periodic trends of reactivity occur with the alkali metals?
  
• Question #544cf
  
• How do you express 275 mmHg in atm. and Pascal?
  
• How many ounces in 1/8 pounds?
  
• How many grams of hydrogen are necessary to react completely with 50.0 g of nitrogen in the reaction #N_2+3H_2->2NH_3#?
  
• If an element gains an electron, will it form a positive ion or a negative ion?
  
• A bus traveled 150 miles on 10 gallons of gas. How many miles per gallon does the bus get?
  
• What is the percentage composition of #Ba(NO_3)_2#?
  
• How many moles of #(NH_4)_2SO_4# are present in 25.0 grams of #(NH_4)_2SO_4#?
  
• How many moles are in 45.0 sample of #MgO#?
  
• How many yards are in 3/4 of a mile?
  
• Question #64eeb
  
• Question #4f461
  
• How many sigma and pi bonds are found in the following?
  
• What mass of carbon dioxide is produced from the complete combustion of #8.50*10^-3# #g# of methane?
  
• Alicin contains 59.9 of carbon, 21.7 hydrogen, 24.4 g of oxygen, and sulfur. What the mass percent of sulfur in a 162 g sample of the compound?
  
• What is the concentration of all ions present in .0200 mole of sodium phosphate in 10.0 mL of solution?
  
• How does light (uv radiation) effect bacterial growth?
  
• What is the total number of oxygen atoms on the left-hand side of #2Ca_2(PO_4)_2(s) + 4SiO_2(s) + 12C(s) -> 4CaSiO_3(s) + P_4(s) + 12CO(g)#?
  
• What is the formula for lead (IV) oxide?
  
• 3.45 g of an unknown gas at 55°C and 1.10 atm is stored in a 2.55-L flask. What is the density of the gas?
  
• What is the concentration of lead ions and sulfide ions in a saturated solution of lead sulfide (#PbS#) solution at 25°C?
  
• C7H12 reacts with O2 to produce CO2 and H2O. Suppose 348 g of CO2 are produced in this reaction. What mass of O2 reacted?
  
• In the reaction #N_2 + 3O_2 -> 2NO_3#, how many grams of #N_2# are required to produce 10 grams of #NO_3#?
  
• What happens to an electron during an absorption process?
  
• How do you write/draw a Lewis structure for #N#?
  
• What is the energy of a photon that has a wavelength of 13.2 nm?
  
• What is the molarity of 416.48 g #BaCl_2# dissolved in #2# #L# of water?
  
• A car travels 165 miles in 5 hours. How many miles does it average per hour?
  
• The atomic mass of carbon is 12.01, hydrogen is 1.01, and oxygen is 16.00. What is the molar mass of glucose #C_6H_12O_6#?
  
• What is the x-intercept of #y=-4(x-15)+4#?
  
• How do you find the quotient of #(4x^2 – y^2) ÷ (2x – y)#?
  
• How do you simplify #(x^4)^2/(x^3)^5#?
  
• What is x if #4x+3/x-9=5#?
  
• How do you simplify #-(2^2)^5#?
  
• How can I balance this equation? ____ N2 + ____ H2 ---> ____ NH3
  
• Question #32c46
  
• Question #da2f7
  
• Question #23843
  
• If the atomic number of an element is 11 and the atomic mass is 24, how many electrons does it have?
  
• How does chemical bonding relate to life?
  
• What is the algebraic expression for the sum of a number and 14?
  
• If the measures of the three angles of a triangle are x, 2x-20, and 3x-10, the what is this type of triangle?
  
• How do you simplify #(8x^3 y^2 z^2) * (3x^2)/(y^3 z^4)#?
  
• How do you evaluate the expression 3a - 2b + b(6 - 2),for a=4,b=2?
  
• How do you solve #5-2y=15#?
  
• Question #5bc49
  
• How do you simplify #(8 - i) - (3+2i) + (-4 + 6i)#?
  
• How do you simplify #i(2+i)#?
  
• How do you simplify #4ab^2 - 3ab^2#?
  
• How do you simplify #25^(2/5) / 25^(2/5)#?
  
• How do you simplify #9^(3/7)* 3^(1/7)#?
  
• How do you simplify 7+7(6)?
  
• How do you simplify #(-7)^2(-7)#?
  
• How do you simplify #(5a^11b^7)/(2)#?
  
• Why the total mass of reactants and of product not change in a chemical reaction?
  
• How do you solve #log x – log 3 = 1#?
  
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