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
What is the molar mass of aspirin, C_(9)H_(8)O_(4) 252.25g/mol 180.17g/mol 244.17g/mol 116.08g/mol 29.02g/mol
22. When sugar is mixed with water equilibrium is reached when molecules of sugar stop moving the dissolved sugar molecules are evenly distributed throughout the
For which of the properties would aluminum have a greater value than gallium? 1. Atomic radius 2. Ionic radius 3. Electronegativity 4. Ionization energy
1A. Which of the following is most likely a significant cause of the general trend indicated by the graph? A. Reduction of ozone concentration in the upper atmosphere B. Reduction in size of polar ice caps C. Increase in energy output of the sun D. Increase in evaporation of ocean water E. Increase in consumption of fossil fuels 1B. Based on the results of the graph, which oceanic changes will be observed? A. pH will decrease, but the ocean will remain basic B. pH will increase and the ocean will become more basic C. pH will decrease and the ocean will become acidic D. pH will not significantly change 2A. When "strong," these dissociate completely in solution. A. Acid B. Base C. Both 2B. Is a proton-donor when dissolved in solution. A. Acid B. Base C. Both 2C. A solution with a pH greater than 7, up to 14. A. Acid B. Base C. Both 2D. A solution that contains more hydronium ions $(H3O+)$ than hydroxide ions $(OH-).$ A. Acid B. Base C. Both
Question 7 Match the definition with the correct term about the atom in relation to the periodic table. number of protons in the nucleus of an $\square $ atom [Choose] [Choose] total number of protons and neutrons in mass number the nucleus of an atom atomic mass atomic number $\square $ weighted, average mass of all isotopes of a naturally occurring element 1 pts
Properly identify the following ions (some answers will be used twice and some answers will not be used at all) magnesium $\square $ phosphate $\square $ ammonium $\square $ chloride $\square $ iron (III) $\square $ perchlorate $\square $
have gone into the field to take water samples from lakes in your town. note the following observations: Lake A contained many fish swimming in its waters. Lake B had very few fish swimming in its waters, and a few dead fish floating on the water. u return to your lab and take pH readings for each mple. Think about how acids and bases would affect the water quality in the two lakes. Which set of pH data would you expect to see based on your observations? Lake A: $pH=4.5$ Lake B: $pH=7.5$ Lake A: $pH=8.3$ Lake B: $pH=3.7$ Lake A: $pH=6.6$ Lake B: $pH=6.8$ Lake A: $pH=10.2$ Lake B: $pH=1.7$
A buffer consists of a weak acid and its conjugate hase in the same solution. Match the weak acid-conjugate base pairs that could be used to make a buffer. (Carvat does not show subscripts HCOOH $\square $ [Choose] $HC2H3O2$ $\square $ : HCN [Choose] H2O $NaCOOH$ $NaC2H3O2$ $NaOH$ $HCl$ $HaCN$ Question 9 aspts
${}_{2}^{4}He$ How many protons does He have? a b b C 2 d 6
Student B: At the beginning of the reaction the rate of the forward reaction was higher than the rate of the reverse reaction: ammonia and water were turning into ammonium hydroxide. But now, the rate of the reverse reaction is higher. Which student has the most accurate answer? Choose 1 answer: A Student A B Student B C Both students' answers are correct.
The number of atoms in a mole of something remains the same, but the mass of a mole depends on how many atoms you have the average atomic mass of the elements
