Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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fill in the blank question toddler christine loves to play restaurant. …
event - schema
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multiple choice question using a memory ____ helps us fill in gaps betw…
C. schema
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multiple select question select all that apply which two of the followi…
connectionist networks, schemas
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that range across a mans imaginings when a sure music fills him and he …
D. "Mending Wall" has a strict rhyme scheme, while "The Man Against the Sky" does not.
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what must a reader do to analyze diction? check all that apply. identif…
- recognize important words - determine the denotation of each word - identify the connotations of words
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34. interpret data look up the densities of the elements in group 1a on…
Lithium, sodium, potassium
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32. calculate a weather balloon is inflated to a volume of 2.2 × 10³ l …
$0.17$ g/L
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the compound butanol has the following structural formula. which of the…
There is no correct option among the given structures as the presented structure has a different molecular formula from butanol.
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how many covalent bonds can a typical carbon atom form? one two three f…
D. four
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what are geometric isomers? ○ compounds that have the same types of ato…
Compounds that have the same atoms arranged in the same order but with different spatial orientations.
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a scientist asks a patient about the food that the patient eats and mak…
The patient should decrease the amount of rice and pasta and increase the amount of lean meats (proteins) in his or her diet.
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acetic acid, an organic compound, has the following structural formula.…
$C_2H_4O_2$
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21. a student finds a shiny piece of metal that she thinks is aluminum.…
The density is approximately $2.5\ g/cm^{3}$ and the metal is not aluminum.
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the molecular formula for methanol is ch₃oh. which model shows methanol…
The second model (assuming the bottom - shown model in the image) as it has 1 black (carbon), 1 red (oxygen), and 4 white (hydrogen) spheres which match the molecular formula of m…
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a patient has diabetes, a disease that causes high blood sugar levels. …
A. carbohydrates
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what is a disadvantage of using a space - filling model to show a chemi…
Space - filling models do not identify the number and type of bonds.
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identify earths neighbors in the solar system by choosing the correct a…
1. Planets 2. Asteroids 3. Venus and Mars 4. Jupiter
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19. the element silver melts at 960.8°c and boils at 2212°c. express th…
The melting - point of silver is $1233.95$ K and the boiling - point is $2485.15$ K.
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question 14 russell needs to dispose of the acid from several old batte…
D. Corrosive
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question 9 select the example of a point source of water pollution. a c…
A. A company maintains its vehicles by using a special chemical that washes into a nearby stream.
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question 7 select a way in which humans impact aquifers. they increase …
They contaminate groundwater with fertilizers.
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question 4 phyllis has an organic apple orchard. the round - headed app…
She treats larvae deep in the wood of a tree with a chemical repellent.
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select all steps below that help you handle chemicals safely. using dro…
Steps to handle chemicals safely: using droppers to transfer small amounts of chemicals, using tongs to move hot objects, checking the test tubes for chips prior to using them, wa…
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redox reactions refer to a pair of reactions in which a particular oxid…
Oxidation reactions: Ca⁰→Ca²⁺ + 2e⁻, H₂→2H⁺ + 2e⁻, NADH + H⁺→NAD⁺+ 2H⁺+ 2e⁻, HS⁻→S⁰+ 2H⁺+ e⁻ Reduction reactions: acetaldehyde + 2e⁻+ 2H⁺→ethanol, ½O₂ + 2H⁺+ 2e⁻→H₂O, Fe³⁺+ e⁻→Fe²…
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3. how many elements are included in the chemical formula for sodium ni…
There are 3 elements. They are sodium, nitrogen, and oxygen.
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a television is plugged into a wall outlet and turned on. which of the …
Electrical energy is transformed into light and sound energy.
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question 4 (mandatory) (1 point) saved __________ can be geometric, org…
C. Shape
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question 16 which of the following statements about renewable and nonre…
D. In the United States, about 20% of energy comes from renewable energy.
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question 12 which of the following describes a natural source of air po…
A dust storm in 1983 dumped 1,000 lb of topsoil onto the city of Melbourne, Australia.
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what type of footwear protects you from chemicals and provides extra tr…
C. Rubber boots
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classification of matter worksheet part 1: classify each of the followi…
Part 1: 1. Heterogeneous mixture 2. Pure substance, compound 3. Pure substance, compound 4. Heterogeneous mixture 5. Homogeneous mixture 6. Homogeneous mixture 7. Pure substance, …
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multiple - choice question what is true about the total atomic number o…
The total atomic number on the right side is equal to the atomic number on the left side
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multiple - choice question what is true about the total mass number on …
the total mass number on the right equal the mass number on the left
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5 — water pollution: point versus nonpoint source learning objective: d…
d. Ocean and lake dumping of waste
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6. write the name for each of the following type iii covalent compounds…
6. a. Chlorine trifluoride b. Xenon dichloride c. Selenium dioxide d. Dinitrogen trioxide e. Diiodine hexachloride f. Carbon disulfide 7. a. Perchlorate b. $ClO^-$ c. Chlorate d. …
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2. silicon has three naturally occurring isotope. apply your knowledge …
$28.11$
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one property of a gas is that its molecules spread out to fill their co…
A teacher's perfume can be detected at the back of the classroom.
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question when 1.87 g of a certain molecular compound x are dissolved in…
$180\ g/mol$ (rounded to 2 significant digits)
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what is a type of contaminant that can cause foodborne illness? chemica…
D. parasites
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question 5 1 pts we learned how soap works in todays lab. true/false: t…
False
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7. the rate of the reaction shown below was studied 2 no + h₂ → n₂o + h…
None of the above mechanisms are consistent.
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7. the rate of the reaction shown below was studied 2 no + h₂ → n₂o + h…
None of the above mechanisms are consistent with the data.
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1. the rate - equation for the reaction: $cl_{2(aq)}+h_{2}s_{(aq)}\to s…
(c)
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* please submit your answers on a separate sheet of paper. you do not n…
1. Positively - charged; negatively - charged 2. Anion 3. a. Lithium iodide b. Magnesium fluoride c. Strontium oxide d. Aluminum bromide e. Calcium sulfide f. Sodium oxide 4. a. I…
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determine the rate law of the following reaction that occurs by the pro…
$rate = k[W]^3$
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quiz instructions did you go through all of the experimental procedures…
True
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identifying a healthy product gabriella stops into a convenience store …
check the bottle’s nutritional label to determine if all the ingredients are healthy
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for the reaction mechanism shown, identify the intermediate(s). cl2(g) …
$\mathrm{Cl}(\mathrm{g})$ and $\mathrm{CCl}_3(\mathrm{g})$
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2. provide the correct formula for the following compounds: note: in co…
a) $CCl_4$ b) $MgCO_3$ c) $V_3(PO_4)_2$ d) $Al_2O_3$ e) $HBr$
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it has been found that ddt in the soil decomposes by a first - order re…
55.7 years
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consider the radioisotope $^{41}$ca (half life = 1.03e5 years). what is…
$6.73\times 10^{-6}\text{ year}^{-1}$
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the half - life of element x is 500 years. if there are initially 8 g o…
1 g
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the second - order reaction a → products takes 13.5 s for the concentra…
$0.144\ M^{-1}s^{-1}$
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1. provide the name for the following compounds: (note: in compounds wh…
a) Calcium sulfide b) Diphosphorus pentoxide c) Chromium(III) hydroxide d) Scandium selenide e) Calcium chlorate
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using the data in the table, plot three sets of points (a, lna, and 1/a…
The reaction is first - order.
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the radioisotope $^{14}c$ (half - life = 5730 years) is used for carbon…
$1.21\times 10^{-4}\text{ year}^{-1}$
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what is the half - life for a particular reaction if the rate law is ra…
$6\times 10^{-4}\ min$
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what is the half - life for a particular reaction if the rate law is ra…
$6.09\times 10^{-4}\ min$
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in the provided reaction profile, the black line represents the pathway…
C. Changing the mechanism of the reaction.
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the rate of a reaction increases when a catalyst has been added to the …
E. provides a new mechanism for the reaction to proceed.
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answer: a o(g) b o₂(g) c o₃(g) d no(g) e no₂(g) for the following react…
D. NO(g)
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6. how is the storys first - sentence - an exclamation - verbally ironi…
6. The exclamation creates a contrast - based tone of pity and dark humor. 7. Find verbally ironic words/phrases about Juan's efforts; they enhance the satirical tone and message.…
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what is science? * a way to create new religions any organized study of…
1. B. Any organized study of the natural world 2. B. By using reason and common sense
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name: sc.8.p.8.4 properties of matter: solubility, boiling/melting poin…
1. c) Magnetism 2. b) The solution has reached its saturation point.
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three sulfur metabolism processes a, b, c are shown. which one(s) repre…
C
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activated sludge: is the microbial activity the breaks down organic was…
The microbial activity the breaks down organic waste in a wastewater treatment system.
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question 28 3.33 pts activated sludge is the microbial activity the bre…
is the microbial activity the breaks down organic waste in a wastewater treatment system.
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four water samples were subjected to bod analysis. which sample had the…
A
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which quote from the text shows the relationship between henri étienne …
"*In 1854 Deville's improvement dramatically increased the amount of aluminum produced.*"
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11. nitrogen gas was collected over water at 25°c. if the vapor pressur…
$758\ mmHg$ ### Question 12
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question 18 5 pts hakim co., a creative advertising agency, stocks its …
B. social responsibility
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rank the compounds from lowest to highest boiling point and explain you…
a. HBr b. NaCl c. I₂ d. N₂ e. CH₄ f. HF
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48 multiple choice 2 points the ph of any fluid is the measure of: the …
the concentration of hydrogen ions.
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which of the following properties of water allows it to form droplets o…
Cohesion
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1 multiple choice 1 point one property of a gas is that its molecules s…
1. A. A teacher's perfume can be detected at the back of the classroom. 2. B. The producer level directly provides energy for all of the other levels.
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which type of lipid is more likely solid at room temperature? saturated…
saturated
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10. fill in the following table. | isotope symbol | atomic number | mas…
| Number of Neutrons | Number of Protons | Mass Number | Atomic Number | Isotope Symbol | | ---- | ---- | ---- | ---- | ---- | | 9 | 9 | 18 | 9 | $_{9}^{18}F$ | | 16 | 15 | 31 | 1…
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what is the %fe in fe₂o₃? 20% 69.9% 35.0% 77.7%
69.9% (corresponding to the second option)
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in a chemical reaction, the atoms of the reactants are rearranged to fo…
When food is digested, as when an enzyme in saliva called ptyalin breaks down starch into sugars without itself changing.
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isotope symbol atomic number mass number number of protons number of ne…
| Property | Value | |--|--| | Atomic Number | 19 | | Mass Number | 40 | | Number of Protons | 19 | | Number of Neutrons | 21 |
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13 multiple choice 2 points what triggers the brain to increase the rel…
A. Osmoreceptors detect an increase in osmolarity in blood plasma.
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hot spot 5points click the hydroxyl group
The two -OH groups in the structure: the one in the -COOH group at the top and the one attached to the middle -C atom.
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25. what element was used as fuel for the \little boy\ bomb? 26. what e…
25. Uranium 26. Plutonium 27. They have short half - lives and are highly unstable.
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data tables (30 points) coke beaker graduated cylinder buret mass of em…
Coke - Beaker: $0.791$ g/mL Coke - Graduated Cylinder: $1.01$ g/mL Coke - Buret: $1.00$ g/mL Diet Coke - Beaker: $0.968$ g/mL Diet Coke - Graduated Cylinder: $1.01$ g/mL Diet Coke…
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would you expect a large amount of the following molecule to be in a li…
Because of an absence of carbon/carbon double bonds, I would expect the sample to be in a solid form.
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5. consider the following reaction to answer the questions below: solid…
a. $2Al(s)+3CuCl_2(aq) ightarrow 2AlCl_3(aq)+3Cu(s)$ b. Single - replacement reaction c. Aluminum ($Al$) is the limiting reactant d. $0.113\ mol$ of $CuCl_2$ remains unused e. $0.…
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19. what is the difference between the compositions of these carbon iso…
19. | | Protons | Electrons | Neutrons | |--|--|--|--| | Carbon - 12 | 6 | 6 | 6 | | Carbon - 13 | 6 | 6 | 7 | | Carbon - 14 | 6 | 6 | 8 | 20. Carbon - 14 undergoes radioactive de…
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origin of the elements 7. what is the origin of hydrogen, the smallest …
7. Produced in Big - Bang nucleosynthesis. 8. Two light nuclei combine; four hydrogen nuclei fuse to form helium in star cores. 9. Core contracts and heats up, outer layers expand…
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4. in the reaction of 2k₃po₄ + 3h₂so₄ → 2h₃po₄ + 3k₂so₄, 15.32 g of h₂s…
a. $27.20\ g$ b. $69.83\%$
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common object they are found in, and an important property. element sym…
| Element Symbol | Element Name | Common Object | Important Property | | ---- | ---- | ---- | ---- | | C | Carbon | Coal | Combustibility | | H | Hydrogen | Water | High flammabil…
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lets u the scale. how many moles of hydrogen are in 2 moles of c₂h₆?
12 moles
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39. rationalize the difference in boiling points for each of the follow…
a. n - pentane has stronger London dispersion forces due to its linear shape. b. HF has hydrogen bonding while HCl has weaker dipole - dipole and London dispersion forces. c. LiCl…
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the united states department of agriculture published results on the qu…
D. graphs
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because polar molecules have unequal sharing of electrons, they ____. d…
act like they have a charge.
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3. in the reaction of mg + 2hcl → mgcl₂ + h₂, 22.8 g of magnesium are r…
a. 89.3 g b. 79.6%
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17. what do sodium and chlorine make when combined? sodium chloride 18.…
| | Sodium (Na) | Chlorine (Cl) | Sodium Chloride (NaCl) | |--|--|--|--| | State of Matter | Solid | Gas | Solid | | Reactive or Stable | reactive | reactive | Stable | | Practica…
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11. what do protons determine about an element?
The identity of an element and its position in the periodic table.
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multiple choice 3 points one property of a gas is that its molecules sp…
A teacher's perfume can be detected at the back of the classroom.
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match each term with the correct answer choice. then write the number o…
The completed magic - square has all row - sums, column - sums, and diagonal - sums equal to 15. The filled magic - square is: | A = 6 | B = 1 | C = 8 | | D = 7 | E = 5 | F = 3 | …
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2. consider a reaction with a theoretical yield of 100.5 g. if the perc…
$90.3$ g