Which gas has a lower flammability limit of 2.5 and an upper flammability limit of 100 while in air at 25^circ C and 101 kPa? Ammonia Acetylene Ethanol Acetone
All combustion reactions are exothermic. When substances burn they usually give off energy as heat and light. True False
Using Delta G calculate the value of the thermodynamic equilibrium constant K for: H_(2)(g)+Br_(2)(l)- -gt 2HBr(g)
An aqueous solution is saturated in both oxygen gas and potassium iodide at 80^circ C Determine what happens when the solution is cooled to room temperature. Nothing happens. All of the oxygen gas and potassium iodide remain dissolved in solution. Potassium iodide precipitates out of the solution. Oxygen gas bubbles out of the solution and potassium iodide precipitates out of the solution. Oxygen gas bubbles out of the solution.
Lucy: What's up with the other elements that are in group 8, like Krypton. Do they have anything in common? a) They have the same number of electron shells b) They have the same number of protons c) They have the same atomic mass d) They have the same number of valence electrons
Multiple Choice Question Salt is __ chloride by weight. 40% 50% 60% 70%
Calculate the cell potential, E_(cell) for the reaction below when [Cr^3+]=0.25M and [Pb^2+]=0.15M 2Cr(s)+3Pb^2+(aq)leftharpoons 2Cr^3+(aq)+3Pb(s) E_(cell)^circ =+0.61V E_(cell)=0.597V E_(cell)=0.573V E_(cell)=1.09V E_(cell)=1.21V E_(cell)=0.871V
What term describes a solution where a solid dissolves in a liquid? soluble insoluble immiscible indissolvable
6) When 2,400 mg zinc is added to hydrochloric acid, 450 mL of hydrogen gas forms at a temperature of 30^circ C What is the pressure of the gas (in atm)? underline ( )Zn(s)+underline ( )HCl(aq)arrow underline ( )ZnCl_(2)(aq)+underline ( )H_(2)(g)
5) Determine the pressure (in mmHg) for the nitrogen gas sample that is collected when 53.0 g of NaN_(3) decomposes. The temperature of the gas is 25^circ C and the volume is 18.0 L. underline ( )NaN_(3)(s)arrow underline ( )Na(s)+underline ( )N_(2)(g)
During brazing, which of the following may present health hazards? Zinc Beryllium Cadmium or phosphorus All are correct
Which particles determine the affinity of atoms to each other and thus the likelihood of a chemical reaction? Protons Neutrons Electrons Nucleus
Get It? Explain how the ion $HCO_{3}^{-}$ can be both an acid and a base. Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
Write the net ionic equation between $Cr_{2}(SO_{4})_{3}(aq)$ and $Ba(OH)_{2}(aq)$ Be sure to include the states of matter. $\square $
Sequence the following equations in the steps of the ionization of phosphoric acid in the correct order. $HPO_{4}^{2-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+PO_{4}^{3-}(aq)$ $H_{3}PO_{4}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+H_{2}PO_{4}^{2-}(aq)$ $H_{2}PO_{4}^{-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+HPO_{4}^{-}(aq)$
When a halide leak detector is used, what color will a blue flame turn when it comes in contact with leaking refrigerant vapors? A. blue B. green C. white D. orange
What kind of Isomers are 1-butene and 2-butene (pictured above)? stereoisomers structural isomers geometric isomers not isomers
Write the balanced NET ionic equation for the reaction when $Cr(NO_{3})_{3}$ and $Li_{2}CO_{3}$ are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
What type of elements are the lanthanides and actinides? a mostly nonmetals and a few metals b mostly metals and a few nonmetals C all nonmetals d all metals
Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
