Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what color indicated that proteins were present in a substance when a c…
D. purple
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what is the chemical indicator that is used to test for starches (carbo…
A. iodine
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question 1 (4 points) (02.01 mc) the slight negative charge at one end …
A. A hydrogen bond
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27. which statement best explains why different elements give off diffe…
C. Because each element has a unique arrangement of electrons and energy levels
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25. if the half - life of radon is 3.8 days and you start with 100 atom…
A. 25
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22. differences in which subatomic particles are responsible for ions a…
22. B. Ions → electrons, Isotopes → neutrons 23. C. 10.8 amu
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20. why is the atomic mass of chlorine 35.45 amu instead of 35.00 amu? …
20. A. Presence of isotopes with different masses 21. A. 17 p, 20 n, 17 e
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18. which is the correct ending for nitrogens orbital diagram? * 4 poin…
A. 2p³ (three half - filled orbitals)
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16. which orbital has the highest energy?* orbital energy levels and su…
D. 3d
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15. what does hund’s rule (the bus rule) state? * before any orbital is…
B. Electrons occupy orbitals singly before pairing.
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12. which list shows the first 7 sublevels that fill with electrons? * …
A. 1s, 2s, 2p, 3s, 3p, 4s, 3d
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if the ph of a solution is 3.9, what would the poh be? a. 10.1 b. -3.9 …
A. 10.1
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question 8 of 10 what is ph? a. a level of dissolved gases that are in …
C. A measurement indicating how acidic a solution is
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question 7 of 10 what property is used to calculate the ph of a solutio…
B. The hydrogen ion concentration in mol/L
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6. which is the correct orbital diagram for sulfur (electrons = 16)? * …
B. Ends with 3p⁴ (two orbitals paired, one single)
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how are ph and poh related? a. ph = poh - 14 b. poh = 14 + ph c. ph = 1…
D. pOH = 14 - pH
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a swimming - pool worker wants the pools ph to be 7.2. she comes by to …
D. Add base
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what is the poh of a solution with oh⁻ = 2.0 × 10⁻²? a. 3.01 b. 1.70 c.…
B. 1.70
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question 3 of 10 what is the ph of a solution with h+ = 7.0 × 10^(-12)?…
A. 11.15
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question 2 of 10 what do acids and bases have in common? what do acids …
C. They are both corrosive and can burn skin.
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question 1 of 10 what is the ph of water? a. -7 b. 1×10⁻⁷ c. 1×10⁷ d. 7
D. 7
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what kind of solution would have a $k_b$ value that is much greater tha…
C. A strongly basic solution
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question 9 of 10 which of the following is a strong base? a. caco₃ (cal…
B. NaOH (sodium hydroxide)
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question 7 of 10 what is always true of a strong acid? a. it has more t…
D. It dissociates completely in solution.
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question 6 of 10 what happens when an acid dissolves? a. it is no longe…
B. $H^+$ increases in solution.
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question 4 of 10 what is $k_b$ for $c_5h_5n(aq)+h_2o(l) ightleftharpoon…
C. $\frac{[C_5H_5NH^+][OH^-]}{[C_5H_5N]}$
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question 3 of 10 what is $k_a$ for $h_3bo_3(aq)=h^+(aq)+h_2bo_3^-(aq)$?…
B. $K_{a}=\frac{[H^{+}][HBO_{3}^{2 - }]}{[H_{2}BO_{3}^{-}]}$
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question 2 of 10 which of the following is an acid? a. lioh (lithium hy…
C. $H_2SO_4$ (Sulfuric acid)
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question 1 of 10 what is the difference between a strong base and a wea…
B. A strong base produces more ions in solution than a weak base.
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what is $k_{eq}$ for the reaction $n_2 + 3h_2 ightleftharpoons 2nh_3$ i…
C. $K_{eq}=1.125$
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what happens if more product is added to a system at equilibrium? a. mo…
A. More reactants will form.
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what is the equilibrium constant for the reaction so₂(g) + no₂(g) ⇌ so₃…
D. \(K_{eq}=\frac{[SO_3][NO]}{[SO_2][NO_2]}\)
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7) match the descriptions with the black inventors. the chemical engine…
1. Norbert Rillieux 2. Mary Kenner 3. Sarah E. Goode 4. Sarah Boone 5. Jan Ernst Matzeliger
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question 5 of 10 which of the following choices is the equilibrium cons…
C. $K_{eq}=\frac{[products]}{[reactants]}$
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question 4 of 10 which describes two phases in dynamic equilibrium? a. …
D. The total number of molecules in each phase stays constant.
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elijah mccoys 57 patents included the automatic lubricator for railroad…
the real McCoy
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question 5 of 10 how can the effect of heat on a reaction be determined…
A. Heat is treated as a reactant or a product.
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question 2 of 10 what is true of dynamic equilibrium? a. the total amou…
D. All the changes to a system cancel out.
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question 1 of 10 what would happen if no were added to n₂(g) + o₂(g) ⇌ …
B. More $N_2$ and $O_2$ would form.
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12. as you move the cursor over the elements, you should see the correc…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
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question 7 of 10 sound molecules can \stack up\ in front of airplanes t…
C. Sonic booms
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question 6 of 10 which of these best describes a flight that is approac…
D. More drag is created because the air molecules are not moving out of the way of the airplane.
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supersonic flight can cause molecules on the surface of an airplane to …
A. This causes a lot of heat that the airplane must be shielded from.
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question 2 of 10 as air molecules move over and under the wings of an a…
A. Lift
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6. use the isotope graph to find the isotopes described here. in each c…
a. Hydrogen - 2 (Deuterium) $\ce{^2_1H}$, Carbon - 12 $\ce{^12_6C}$, Oxygen - 16 $\ce{^16_8O}$ b. Hydrogen - 2 (Deuterium) $\ce{^2_1H}$, Helium - 4 $\ce{^4_2He}$ c. Carbon - 12 $\…
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9. a large value for thermal conductivity means that the element is a s…
9. Silver, Copper 10. a. Nitrogen b. Nihonium
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6. what is the symbol and atomic number of the element with the most pr…
6. Og, 118 7. Hg, Br 8. Gases: H₂, He, Ne, Ar etc.; Liquids: O₂, N₂ etc. 9. Ag, Cu
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1. what elements are a gas at a given temperature?helium, neon, argon, …
1. Helium, neon, argon, krypton, xenon, radon 2. Helium (He, atomic number 2), neon (Ne, atomic number 10), argon (Ar, atomic number 18), krypton (Kr, atomic number 36), xenon (Xe…
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in which of the three bonds shown, are the electrons shared loosely? me…
Metallic Bonds
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6. what is the symbol and atomic number of the element with the most pr…
6. Symbol: Og, Atomic number: 118 7. Mercury (Hg), Bromine (Br) 8. Gases: Hydrogen (H₂), Helium (He) etc.; Liquids: Depends on substances present (e.g., some cryogenic liquids) 9.…
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1. what elements are a gas at a given temperature? hydrogen, helium, ni…
2. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn). 3. Atomic number, atomic mass, symbol, element type, electron configuration. 4. Melting point, boiling…
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7 what types of elements are noble gases? nonmetals metals metalloids 8…
7. Nonmetals 8. Metals
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4 which of the following types of elements can be brittle solids? metal…
4. Nonmetals and metalloids 5. Metals only 6. Nonmetals only
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2 which family is the most reactive? noble gas transition metal alkali …
2. C. Alkali Metal 3. Noble Gas: Do not form ions easily Alkali Metal: + 1 ions Transition Metal: Variable - charged ions Alkaline Earth Metal: + 2 ions Halogen: - 1 ions
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1 match the elements to the correct name of the family. lithium chlorin…
Lithium - Alkali metals Chlorine - Halogens Argon - Noble gases Iron - Transition metals Magnesium - Alkaline - earth metals
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una muestra de un compuesto desconocido tiene una composición porcentua…
The compound could be ethanol (assuming the first - option was meant to be $CH_3CH_2OH$). The other options with "do" seem to be mis - written and not valid chemical formulas in t…
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una muestra de un compuesto desconocido tiene una composición porcentua…
The compound \(C_2H_6O\) (ethanol) could be the sample as its percentage composition of carbon (\(\approx52.17\%\)), hydrogen (\(\approx13.04\%\)) and oxygen (\(\approx34.78\%\)) …
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analysis: there will be 2 sections to your analysis listed below (calcu…
The molar mass of the gas can be calculated using $M = \frac{mRT}{PV}$. The percent error can be calculated using $\text{Percent Error}=\frac{\vert\text{Experimental Value}-\text{…
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purpose (lo): use water displacement and the pv=nrt equation to determi…
If we assume the correct mass data and calculations, the molar mass of butane ($C_4H_{10}$) is 58 g/mol. If we calculate based on the data in the table with some assumptions for t…
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relaciona cada escenario con la ley que lo explica un globo se encoge c…
| Scenario | Law | |--|--| | A balloon shrinks when taken outside in winter. | Charles's Law | | When the size of a chamber is increased, air - pressure decreases. | Boyle's Law |…
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make the following conversions a. 15.6 g =? μg b. 3.72 x 10⁴ g =? kg c.…
a. $1.56\times 10^{7}\text{ μg}$ b. 37.2 kg c. 72300 cm³ d. 0.37 kJ e. 4700 dg f. 81 μL g. $3.7\times 10^{14}$ pg h. $4.7\times 10^{9}$ μg i. 0.61 mL j. 25600 mg k. 0.0572 ML l. $…
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escriba la respuesta correcta en el cuadro. la solubilidad del carbonat…
790
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ley de los gases ideales pv=terapia de reemplazo de n- tratamiento (trn…
A. 0.026 moles
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ley de los gases ideales pv=terapia de reemplazo de n - tratamiento (tr…
B. 0.12 moles
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meet the man who invented cool whip, tang and pop rocks text font size …
C. William A. Mitchell was a creative food scientist who invented convenient foods from artificial ingredients.
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
$3.56\times 10^{-4}$ mol
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
D. 514 kPa
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
B. 0.33 moles
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chem 1110 lab - naming and oxidation numbers bonus activity - worth up …
1. Nickel(II) bromide; \(Ni = + 2\) 2. Sulfurous acid; \(S = + 4\) 3. Lead(IV) chlorite; \(Cl = + 3\) 4. Dichlorine pentoxide; \(Cl = + 5\), \(O=-2\) 5. Uranium(VI) fluoride; \(U …
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hoja informativa sobre las leyes de los gases ley de los gases ideales …
$1470$
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an explosive start born to a minnesota farm family in 1911 mitchell was…
The main idea of "An Explosive Start" is that Mitchell faced many challenges in his early life including family loss, difficult work to earn money, and a serious laboratory accide…
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meet the man who invented cool whip, tang and pop rocks text laura l do…
The main idea of the given text is that William A. Mitchell, a research chemist, invented popular ready - made foods like Cool Whip, Tang, and Pop Rocks, which influenced generati…
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meet the man who invented cool whip, tang and pop rocks text laurie l d…
C. William A. Mitchell invented many easy to prepare foods during the middle of the twentieth century.
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multiple choice question because it is already stored in memory, ____ a…
D. schemas
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escriba la respuesta correcta en cada casilla ¿qué es la fórmula empíri…
1:3
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seleccione la respuesta correcta. a520 gramosuna muestra de agua de mar…
C. 3.6%
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5. in chemistry class, some students make solutions by mixing water (h₂…
Yes, Maurice is correct. The ratio of the amount of potassium iodide to water in each case is 0.04, indicating a proportional relationship with a constant of proportionality of 0.…
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question 14 (1 point) answer the following questions using the image be…
Volume: 10.0 mL Number of Sig Figs: 3 Lower Calibration Measurement: 0 mL Upper Calibration Measurement: 30 mL
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5. in chemistry class, some students make solutions by mixing water (h₂…
Yes, Maurice is correct.
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question 13 (4 points) answer the following questions using the image b…
Volume: 7.3 mL Number of Sig Figs: 2 Lower Calibration Measurement: 6 mL Upper Calibration Measurement: 9 mL
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question 12 answer the following questions using the image below. deter…
34.0 mL 3 20 mL 40 mL
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9 consider the molecular formula cocl₂. based on your knowledge of bond…
The chlorine atoms should be bound to the carbon atom.
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complete the following reactions using structural formulas, state the t…
Type: Free - radical substitution reaction $CH_3 - CH_2 - CH_3$: Propane Product $CH_3 - CHI - CH_3$: 2 - iodopropane
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1. how are elements and compounds different? a. elements are many diffe…
1. D. Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically. 2. D. Carbon (C) 3. C. Mixture 4. B.…
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3 multiple choice 1 point how does the speed of light in water compare …
The speed is slower in water than in air because the molecules are closer together.
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1. how are elements and compounds different? a. elements are many diffe…
1. D. Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically. 2. D. Carbon (C) 3. C. Mixture 4. B.…
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how are the following structures related? a. diastereomers b. enantiome…
A. Diastereomers
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for each pair below, decide whether the name and formula are correctly …
a. none b. $Li_3P$ c. $TiO_2$ d. $Na_2CO_3$ e. none f. none
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2 what is the charge on the cation in each compound below? a pdcl₂ b al…
a. + 2 b. + 3 c. + 2 d. + 4 e. + 3
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in may 2007, wildfires burned more than 350 square miles of habitat in …
The remaining organisms in the area become more territorial.
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a gas has a pressure of 749.9 mm hg at 12.5 °c. what is the temperature…
$-31.8$
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optional: makeup homework complete this homework to replace your lowest…
1. C. Solid 2. 57 L
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7 fill in the blank 1 point round 0.199 moles to 2 significant figures.…
0.20 moles The particles move faster. 289.8 mL
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3 multiple choice 1 point which of these is an compound? sodium hydroxi…
A. sodium hydroxide, NaOH ### Question 4
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(e) what oxidation number is assigned to nitrogen in the reactant nh₄cl…
The oxidation number of nitrogen in \(NH_4Cl\) is - 3. ### (f)
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part b how does the social context of the passage help the author devel…
D. The "semi - barbaric" state of the kingdom, where passion sometimes overrules ethics, helps readers understand that the princess might decide to sacrifice her lover.
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chm1110 laboratory limiting reactant there would be 0.502 grams of acet…
0.702 g
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if many trees are removed from a forest by logging, what is the most im…
decreased use of atmospheric CO₂
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review day question for unit one (atomic structure & properties) the ta…
(a) Element 1 is most metallic as it has the lowest first - ionization energy among the four elements in the third period. (b) Without specific ionization energy analysis details …
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1)quappelle - t - on carbone acimétrique. 2)citez les isoméries optique…
1) Un atome de carbone lié à quatre groupes différents. 2) Isoméries optiques : rotation de la lumière plane - polarisée due à carbone asymétrique. Isoméries géométriques : cis - …