Personal Protective Equipment (PPE) in a laboratory setting may include (select ALL that apply): A A lab coat B Goggles C Open toe shoes D Gloves
Which of the following fields does NOT commonly use UV/Vis spectrometry? A Chemistry B Environmental Science C Clinical diagnostics D Astronomy
A gas sample in a Boyle's law apparatus is compressed to a volume of 22.0 mL. If its original volume was 37.0 mL at 12,000Pa what is the new pressure of the gas sample. Show your calculations. 0/10000 Word Limit square .
Name this alkane: CH_(3)-CH_(2)-CH-CH_(2)-CH-CH_(2)-CH_(3) vert vert vert CH_(3) CH_(3) Spell out the full name of the compound. square
Experiment 1: Perform Qualitative Tests for the Group I Cations Part 1: Identify the Pb^2+ Ion 1. Take a clean test tube from the Containers shelf and place it on the workbench. 2. Take 0.2 M lead (II) nitrate from the Materials shelf and add 5 mL to the test tube. 3. Take 12 M hydrochloric acid from the Materials shelf and add 5 mL to the test tube. Is there a precipitate? If so what color is the precipitate? Record your observations Data Table 1. 4. Take a second test tube from the Containers shelf and place it on the workbench. 5. Decant the liquid from the first test tube by moving it onto the empty test tube. Select the Decant option from the window that appears. 6. Discard the second test tube of liquid by emptying it into the waste than placing in the sink.
What is the net ionic equation of the following reaction? LiOH(aq)+HBr(aq)arrow H_(2)O(l)+LiBr(aq) Li^+(aq)+OH^-(aq)+H^+(aq)+Br^-(aq)arrow H_(2)O(l)+LiBr(aq) LiOH(aq)arrow Li^+(aq)+OH^-(aq) Li^+(aq)+Br^-(aq)arrow LiBr(aq) H^+(aq)+OH^-(aq)arrow H_(2)O(l) HBr(aq)arrow H^+(aq)+Br^-(aq)
At equilibrium, a reaction vessel contains 4.50 atm of Br_(2) and 1.10 atm of NBr_(3) According to the reaction: 2NBr_(3)(g)leftharpoons N_(2)(g)+3Br_(2)(g)Kp=4.8 Determine the equilibrium partial pressure of N_(2)
For a particular reaction K=98000 . What can be said about this reaction?
A chemist dissolves 331 mg of pure hydrobromic acid in enough water to make up 270.mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits. square
How many moles of ammonia gas equal 1.51times 10^24 molecules NH_(3) 2.51 mol 25.1 mol 0.399 mol 0.251 mol 3.99 mol
$2N_{2}O_{5}(aq)\rightarrow 4NO_{2}(aq)+O_{2}(g)$ Which choice represents the relative rate expression between $N_{2}O_{5}$ and $NO_{2}$ ? 1 $Rate=-\frac {1}{2}\frac {\Delta [N_{2}O_{5}]}{\Delta t}=\frac {1}{4}\frac {\Delta [NO_{2}]}{\Delta t}$ 2. $Rate=\frac {\Delta [N_{2}O_{5}]}{\Delta t}=\frac {\Delta [NO_{2}]}{\Delta t}$ 3 $Rate=-\frac {1}{4}\frac {\Delta [N_{2}O_{5}]}{\Delta t}=\frac {1}{2}\frac {\Delta [NO_{2}]}{\Delta t}$ 4 $Rate=2\frac {\Delta [N_{2}O_{5}]}{\Delta t}=4\frac {\Delta [NO_{2}]}{\Delta t}$
At high temperatures bromine molecules can dissociate into bromine atoms. For the reaction $Br_{2}(g)\rightleftharpoons 2Br\cdot (g)$ $K_{p}=2.48\times 10^{-3}$ at $1650^{\circ }C$ A 5.00 L vessel at $1650^{\circ }C$ is filled with $Br_{2}(g)$ at an initial pressure of 6.00 atm and allowed to come to equilibrium. What will be the pressure (in atm) of $Br\cdot (g)$ at equilibrium?
The boiling point of bromine is $59^{\circ }C$ Which of the following best predicts the boiling point of iodine monochloride, a polar compound? Higher than $59^{\circ }C$ because dipole-dipole interactions in iodine monochloride are stronger than dispersion forces in bromine. Lower than $59^{\circ }C$ because ionic bonding in bromine is stronger than covalent bonding in iodine monochloride. Lower than $59^{\circ }C$ because dipole-dipole interactions in iodine monochloride are weaker than in bromine. Higher than $59^{\circ }C$ because ionic bonding in iodine monochloride is stronger than H-bonding in bromine.
Under certain conditions the rate of this reaction is zero order in ammonia with a rate constant of $0.0026M\cdot s^{-1}$ $2NH_{3}(g)\rightarrow N_{2}(g)+3H_{2}(g)$ Suppose a 300. mL flask is charged under these conditions with 450.mmol of ammonia. How much is left 100 s later? You may assume no other reaction is important. Be sure your answer has a unit symbol,if necessary, and round it to the correct number of significant digits. $\square $
Cleaning chemicals are generally not health hazards True False
Identify the molecule or molecules containing polar covalent bonds. HF CsF $Br_{2}$ KH $N_{2}$
A saturated solution holds the maximum amount of solute under the solution conditions. True False
Copper, a good conductor, has __ electron(s) in its valence shell. a. 1 b. 3 c. 4
To identify a chemical's hazards, check its: Smell Color MSDS
A 0.788 mole sample of ideal gas at $12^{\circ }C$ occupies a volume of 4.25 L. What is the pressure of the gas? $\square $
