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Chemistry
Chemistry
High School
If 1.85 grams of Mg(OH)2 reacts with 3.71 grams of HCl how much MgCl2 is produced?what is the limiting reactant? 1Mg(OH)2+2HCl=1MgCl2+2H2O
Chemistry
College
What is ph of .530 M solution of carbonic acid that has acid dissociation of 4.4 x 10^-7
Chemistry
High School
please help me with my homework 5. Identify each of the following as element, compound, homogeneousmixture, or heterogeneous mixture. Explain your reasoning for each.a. milkb. iron nailc. glassd. sugare. bottled spring waterf. distilled waterg. airh. alloy bicycle framei. propanei.baking soda
Chemistry
High School
the first arrow in the resonance of the amide is drawn for you. in the second structure, add one curved arrow to show the movement of an electron pair that will result with the positive charge moving to the nitrogen atom. complete the resonance structure by drawing the bond formed by the movement of electrons in the previous step.
Chemistry
College
The 14.7 g sample of graphite takes up a volume of 6.6 cm^3. What is the density of graphite?
Chemistry
College
Water, table salt, and tin metal are all pure substances. Which of these pure substances are compounds
Chemistry
High School
which one of edwin hubbles findings support the big bang theory
Chemistry
High School
a balloon originally had a volume of 4.39 l at 44 c and a pressure of 729 torr. the balloon must be cooled to c to reduce its volume to 3.62 l (at constant pressure).
Chemistry
High School
advanced study assignment (asa) a student reacts a 0.050g sample of magnesium in excess hydrochloric acid in order to produce hydrogen gas collected at room temperature (23.2c). 48.6 ml hydrogen gas is collected in an eudiometer tube with water initially at 20.0c. 1. how many moles of magnesium are reacted? moles of magnesium reacted: 2. from the balanced chemical equation, how many moles of hydrogen gas are created? moles of hydrogen gas created: 3. if the pressure inside the eudiometer tube is equalized to atmospheric pressure (1.00 atm), what is the pressure of only the hydrogen gas in the tube (without water vapor)? pressure of hydrogen gas only: 4. considering that this reaction was not performed at stp, calculate the volume of hydrogen gas that would have been produced at stp. (hint: use equation 1) volume of hydrogen gas at stp: 5. using the information you calculated, what is the molar volume at stp for hydrogen gas? molar volume of hydrogen gas: 6. given the known molar volume of an ideal gas at stp, calculate the percent error in your experiment. percent error:
Chemistry
High School
draw a three-dimensional orbital representation for each of the following molecules, indicate whether each bond in it is a or bond, and provide the hybridization for each non-hydrogen atom
Chemistry
High School
3. From a stock solution of Dye A, a series of four dilutions were made. The concentration and absorbancedata are given below, beginning with a calibrated blank of distilled water. Plot a Beer-Lambert law graph of absorbance versus concentration.ConcentrationAbsorbance0.000 (blank)40.00 M1.00 x 10-5 M0.2702.00 x 10-5 M0.5503.00 x 10-5 M0.8104.00 x 10-5 M1.100
Chemistry
College
Neon has three stable nautrally occurring isotopes. The isotopic mass and percent abundance of these isotopes are given inthe table.Isotope20 Ne21 Ne22 NeIsotopic mass (u)19.9920.9921.99Abundance (%)90.480.2279.25Calculate the average atomic mass of neon.
Chemistry
High School
Apply what you've learned aboutseparating mixtures to explain why as manyparticles as possible are allowed to settleout before the water is passed throughfilters.
Chemistry
High School
a student analyzes his reaction mixture by tlc. after developing the tlc plate in ethyl acetate, he observes a single spot, with an rf of 0.95. does this indicate that his reaction mixture contains only one compound? what can be done to verify the purity of the sample by tlc? select all answers that apply.
Chemistry
College
- For one of the valence electrons in the Helium atom, do you think the pull on that electron would be greater than,less than, or equal to the pull on the Hydrogen atom's valence electron? Use Coulomb's law to support youranswer.
Chemistry
High School
3. A stack of recyclable newspaper 36 inches highwill save one tree. The number of trees saved byrecycling is directly proportional to the height of astack of recyclable newspapers. How many treeswould be saved from a stack of newspapers 24 feethigh?
Chemistry
High School
Helpppp I have no clue what to put here in the blanks
Chemistry
High School
All side lengths of JKL equal 2 units. A transformation maps JKL to J'K'L'. The length of side J'K' is 5 units. Is this a rigid transformation?No, there is no one-to-one mapping of all the points of the pre-image to the image.No, at least one segment length is not preserved, making this a nonrigid transformation.Yes, the vertices of the pre-image map to the vertices of the image.Yes, all of the side lengths of the pre-image are proportionate to the image.
Chemistry
High School
Why was it important to have endothermic and exothermic processes in the building materials of your train?
Chemistry
College
Write the ions present in solution of Pb(C2H3O2)2 .
Chemistry
High School
an ester can be produced by: a. reacting acid anhydride with carboxylic acid b. reacting aldehyde with carboxylic acid c. reacting alcohol with carboxylic acid d. reacting aldehyde with carboxylic acid
Chemistry
College
The energy stored in the chemical bonds of a carbohydrate molecule isA. specific heat. B. Kinetic energy. C. potential energy. D. worked.
Chemistry
College
The lithium-iodine battery is used in pacemakers to generate small electrical impulses that trigger the heart to beat according to the following equation. Identifythe species oxidized.2 Li(s) + I2 (s) 2 Lil(aq)
Chemistry
College
What does the author describe in this passage? The author describes different types of t-shirts. The author describes reasons for moving to New York City. The author describes two types of energy. The author describes the dangers of riding in taxis.
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