Chemistry in Daily Life Questions and Answers

Select the correct meaning of the term chemiluminesence from the list below 1 A chemical reaction where an excited state is formed releasing energy in the form of a photon of light on relaxation 2 The release of light by a chemical reaction within a living organism 3 An excited state is formed by the absorption of electromagnetic radiation which rapidly relaxes to release energy in the form of a photon of light 4 An excited state is formed by the absorption of electromagnetic radiation which slowly relaxes to release energy in the form of a photon of light Chemiluminescence is best described by statement 2

Select the correct meaning of the term chemiluminesence from the list below 1 A chemical reaction where an excited state is formed releasing energy in the form of a photon of light on relaxation 2 The release of light by a chemical reaction within a living organism 3 An excited state is formed by the absorption of electromagnetic radiation which rapidly relaxes to release energy in the form of a photon of light 4 An excited state is formed by the absorption of electromagnetic radiation which slowly relaxes to release energy in the form of a photon of light Chemiluminescence is best described by statement 2

13 42 Predict the major product for each of the following reaction sequences a b 1 Hg OAc 2 MeOH 2 NaBH4 1 Hg OAc 2 2 NaBH OH

Draw the most stable chair conformation for the compound name given below 15 2S 4S 2 isopropyl 1 4 dimethylcyclohexane

maroon jordan 1 Google Search Jordan 1 Retro High Light Smok Blackboard Texas Tech Unive References Use the References to access important values if needed for this question Experiment 8 Sp A 0 698 mol sample of Xe gas is confined in a 17 4 liter container at 30 6 C If the temperature of the gas sample is decreased to 11 3 C holding the volume constant the pressure will decrease because Choose all that apply With lower average speeds on average the molecules hit the walls of the container with less force At lower temperatures molecules have lower average speeds As the number of molecule wall collisions increases the force per collision decreases With higher average speeds the molecules hit the walls of the container more often

Ammonium perchlorate NH4CIO4 is the solid rocket fuel used by the U S Space Shuttle It reacts with itself to produce nitrogen gas N chlorine gas C1 oxygen gas O water H O and a great deal of energy What mass of oxygen gas is produced by the reaction of 2 37 g of ammonium perchlorate Round your answer to 3 significant digits

A 0 20 mol L solution of Ca PO4 2 completely dissociates in water What is the resulting concentration of anions in solution O 0 20 mol L 0 40 mol L O 0 60 mol L O 0 80 mol L 1 0 mol L

Which temperature range is the danger zone for food storage OA 0 F to 32 F OB 32 F to 145 F

CH3 H C CH CH CH CH3 OH H3C CH CH CH CH3 CH3 H3C

For each chemical reaction in the table below decide whether the highlighted reactant is a Br nsted Lowry acid a Br nsted Lowry base or neither reaction NH3 aq H O 1 NH aq OH aq NH aq H O NH aq H O aq HI aq H O I aq H O aq I aq H O 1 HI aq OH aq highlighted reactant Bronsted Lowry Bronsted Lowry acid base O O O neither O O

You want to determine the specific heat capacity of a piece of metal You find that it requires 2 55 kJ to heat a 27 5 g piece of the metal from 22 C to 62 C What is the specific heat capacity of the metal in J g C Report your answer to the correct number of significant figures Show your work here or on a separate sheet of paper to receive full credit for your answer

If a base represented as B reacts with the most acidic proton on the given compound where is the proper location for the end of the curved arrow shown Select the correct circled position for the terminus of the arrow Ho d a Br b a CH3 H B

Pick the IUPAC name for the following compound HO X O 3 methyl 3 4 epoxypentan 1 ol O 5 hydroxy 3 methyl 2 3 epoxypentane O 1 2 hydroxyethyl 1 2 dimethyloxirane O 3 4 epoxy 3 methylpentan 1 ol

When hydrogen gas is passed over solid stannous oxide the following reaction occurs SnO2 s H g 2 H O g Sn s If the system is stressed by adding additional Sn the system will respond by Select If the system is stressed by adding additional H the system will respond by Select

15 Trina is a sales agent comparing properties for a client who wants to sell his property Where would Trina look for comparable properties a a home in another county b a home 20 miles away c a home in close proximity d a home in another city

8 C H4 3 0 2 CO2 2H O 9 2 KClO3 2 KCl 3 02 10 Pb NO3 2 2 NaCl 2 NaNO3 PbCl2 Type of Reaction Type of Reaction Type of Reaction Oxygen 11 What type of reaction is shown to the left Carbon 8 8 80 12 Using the key provided write the complete chemical formula shown in the box above 13 Now balance the equation above so that both sides of the reaction are equal 27 W 28 29