Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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2. determine if the following is a physical change (p) or a chemical ch…
a. P b. C c. C d. C e. P f. P g. P h. C
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3. i can determine the number of significant figures in a measurement. …
- For \(30.50\) cm: \(4\) - For \(400.0\) sec: \(4\) - For \(0.000000450\) g: \(3\)
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subatomic particles 1. for an atom of carbon (c) with an atomic number …
1. - a. 6 - b. 6 - c. 6 2. - a. 82 - b. 125 - c. 82 3. - a. 79 - b. 118 - c. 79
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question 11 (6 points) atoms have positively charged particles, negativ…
d. Atoms have the same number of electrons (negative charge) and protons (positive charge).
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3. for each of the following circle the correct element: a. most electr…
a. O b. Pb c. (There is an error in the question as all are non - metals in normal conditions, but if forced (incorrectly) based on some old - fashioned (wrong) comparison, no pro…
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question 6 (10 points) what is the probability of finding an electron w…
a. 90%
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question 4 (10 points) naturally occurring bromine consists of two isot…
B. \(44,46\)
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5. complete the following calculation using correct significant figures…
\(2.8\times 10^{10}\)
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4. there are electrons, protons, and neutrons in an atom of 115in2+.
\(47\) electrons, \(49\) protons, and \(66\) neutrons.
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3. fill in the following table (provide answers with two digits after t…
| Isotope | Mass | Abundance | | ---- | ---- | ---- | | \(^{6}\text{Li}\) | \(6.02\) amu | \(7.59\%\) | | \(^{7}\text{Li}\) | \(7.02\) amu | \(92.41\%\) |
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convert 3.35 x 10-8 mm into nm fill in the following table (provide ans…
For \(^{7}\text{Li}\), the mass is \(7.02\) amu and the abundance is \(92.41\%\)
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6. a closed flask of air (0.250l) contains 5.0 “puffs” of particles. th…
\(149\space kPa\) (rounded to three significant figures)
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which forms of energy do humans use to power many of their everyday dev…
electrical, chemical
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unit 2 worksheet 3 - pvtn problems on each of the problems below, start…
1. The new pressure is approximately \(1.67\space atm\) 2. The pressure in the tire is approximately \(94.3\space psi\) 3. The volume of the gas is approximately \(162.5\space mL\)
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this is a bohr model of an atom or ion. select the nuclear notation tha…
\( \boldsymbol{^{14}_{7}\text{N}^{3-}} \)
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this is a bohr model of an atom or ion. select the nuclear notation tha…
\( \boldsymbol{^{24}_{12}\text{Mg}} \) (or the option labeled \( \boldsymbol{^{24}_{12}\text{Mg}} \) among the choices)
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etymology of the word \atom\ the word atom comes from the greek languag…
- "not to be cut" - "not" - "to cut" - "smallest; cut" - "units" - "protons; neutrons; electrons"
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this is a bohr model of an atom or ion. select the nuclear notation tha…
\( \boldsymbol{_1^2 \text{H}^+} \) (the third option: \( \boldsymbol{_1^2 \text{H}^+} \))
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1. an element has an electron configuration of (1s^{2}2s^{2}2p^{6}3s^{2…
C. 27
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7 analyzing processes describe two ways by which the particles in the p…
\(18000\space mL\) (or \(18\space L\))
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critical thinking 5 making inferences imagine that bubbles begin to for…
The external pressure on the liquid must have decreased.
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comparing how are boiling and evaporating similar? how are they differe…
Similarity: Both are liquid - to - gas phase changes. Difference: Boiling occurs throughout the liquid at a fixed temperature (boiling point), evaporation occurs at the liquid's s…
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name:states of matterfor each description below, label each mystery sub…
1. solid 2. liquid 3. Bose - Einstein condensate 4. gas 5. plasma 6. solid, liquid, gas, plasma
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understanding concepts 3 describing describe how the motion and arrange…
As a substance freezes, the particles' motion slows (lose kinetic energy) and they arrange more orderly (fixed pattern as in a solid, vibrating in place instead of sliding like in…
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a 4.691 g sample of mgcl₂ is dissolved in enough water to give 750. ml …
\(0.0657\)
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patterns of attraction quick check combustion reactions release ______.…
light, carbon dioxide, and water
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patterns of attraction quick check use the periodic table to answer the…
fluorine
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patterns of attraction quick check use the reactivity series to answer …
sodium
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patterns of attraction quick check which option describes something tha…
C. large electronegativity differences
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clicker question an increase in temperature increases the rate of a che…
C. a greater fraction of particles have sufficient kinetic energy.
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question 5 (2 points) what is the formal charge on the atom designated …
-1
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question 4 (2 points) which of the following is not an exception to the…
O.
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question 3 (2 points) a metal \m\ has 2 valence electrons and a non - m…
MX
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question 2 (2 points) which response below shows atoms with 4 valence e…
C, Si, Ge
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question 1 (2 points) the correct lewis dot structure for boron would h…
the symbol B with 3 single dots.
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question 5 (2 points) which of the following atoms has the largest firs…
Si
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question 4 (2 points) which of the following statements is correct? an …
C. A cation is smaller than a neutral atom.
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question 3 (2 points) the calcium cation and chloride anion are _______…
isoelectronic
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question 2 (2 points) effective nuclear charge _______________________.…
C. increases as you move from left to right on the periodic table
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question 1 (2 points) which element has the smallest radius? be ba f mg…
F.
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an unknown element x has the following isotopes: 52x (90.00% abundant, …
\( 51.76 \) amu
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neutral atoms of all isotopes of a given element have the same____. ans…
C. number of electrons
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what is the atomic symbol and mass number for an atom containing 88 pro…
\(^{226}\text{Ra}\)
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what is the atomic symbol and mass number for an atom containing 6 prot…
B. \(^{14}\text{C}\)
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what is the atomic symbol and mass number for an atom containing 50 pro…
B. \(^{114}_{50}Sn\)
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what is the atomic symbol and mass number for an atom containing 92 pro…
C. \(^{235}U\)
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what is the atomic symbol and mass number for an atom containing 26 pro…
C. \(^{57}\text{Fe}\)
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2. a process of dating the age of organic material by measuring the dec…
C. radiocarbon dating
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discarded. on the contrary, the carcasses of the animals were used to f…
C. The rising of sea levels due to melting glaciers
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describe the energy and motion of particles in a solid. question 2 desc…
- **Solid**: Particles have low energy and vibrate in fixed positions. - **Liquid**: Particles have moderate energy and move more freely, sliding past each other.
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question 5 there are 92 naturally occurring elements. how does this rel…
Elements combine in different ways to create many more than 92 compounds.
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here is a chemical formula: (nh₄)₂co₃ how many atoms of hydrogen (h) ar…
\(8\)
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this illustration is one way to diagram the atomic structure of a carbo…
does not accurately depict the positions of electrons.
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this table classifies several compounds as either lonic or covalent. ac…
at least one metal and at least one nonmetal.
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which of these graphs best represents the relationship between the volu…
The second graph (the straight - line graph passing through the origin) best represents the relationship.
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41. pdcl₂ = palladium(ii) chloride 42. ircl₃ = iridium(iii) chloride 43…
44. iron(III) sulfate 45. chromate ion 46. vanadium(V) sulfate 47. cesium chloride 48. rhodium(III) iodide
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29) the goal of psychophysics is a) to understand how stimuli from the …
29) d 30) c 31) a 32) b 33) b 34) d
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question 10 of 10 which of the following is an example of an environmen…
C. Televisions that contain dangerous chemicals being thrown into landfills
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question 9 of 10 how have chemists helped fight leukemia? a. chemists h…
B. Chemists have developed medicines to fight leukemia.
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question 7 of 10 how has the scientific community addressed the safety …
C. Chemicals are repeatedly tested, even those that have existed for a long time.
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question 3 of 10 which of the following people use chemicals? a. everyo…
A. Everyone
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question 1 of 10 which of the following is an example of how chemicals …
C. Chemicals are used to clean soil to remove dangerous materials.
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33. what is the name for the instrument below? a) graduated cylinder c)…
33. d) test tube 34. b) precise, not accurate 35. a) 150mL beaker 36. a) \(g/cm^{3}\) 37. a) both (b) and (c)
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a) oil tube b) funnel c) beaker d) evaporating dish 23. read the gradua…
23. c) \(49.4mL\) 24. a) kilogram 25. b) \(311400Pa\) 26. c) evaporating dish
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question 2 of 10 why is chemistry a science, but alchemy was not? a. ch…
D. Chemistry uses experiments to test ideas, whereas alchemy used superstitious practices.
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2. which of the following is not true about matter in the biosphere? (a…
C. The total amount of matter decreases over time.
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7. experimentation involves the testing of... a) variables b) conversio…
7. a) variables 8. c) cm 9. b) the study includes the testing of a variable with a known and accepted result 10. d) 768g 11. d) pressure 12. a) dump down the drain 13. d) 2 14. a)…
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7. experimentation involves the testing of... a) variables c) laws b) c…
d) \(768g\)
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2. classify the reactions in the \test your knowledge\ section of the a…
a. Combustion reaction b. Combination reaction c. Decomposition reaction d. Combination reaction
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multiple choice identify the choice that best completes the statement o…
1. d) independent variable 2. d) it's speeding up 3. d) \(\%\) completed 4. b) \(12\) sec
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the bond dissociation energy is the same for different molecules. true …
False
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the bond dissociation energy is different for different molecules. true…
True
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23. crcl₃ = chromium(iii) chloride 24. f₂o₃ = iron(iii) oxide 25. co = …
29. \(Al_2(SO_4)_3=\text{Aluminum sulfate}\) 30. \(SnCl_4=\text{Tin(IV) chloride}\)
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a non - polar bond forms when: two atoms are dissimilartwo molecules ar…
two atoms are exactly alike
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which of these contains a second order covalent bond? nh₃ h₂ n₂ co₂
\(CO_2\)
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23. crcl₃ = 24. f₂o₃ = 25. co = 26. sio₂ = 27. nahco₃ = 28. cu(no₃)₂ =
23. Chromium(III) chloride 24. (Assuming \(Fe_{2}O_{3}\)) Iron(III) oxide 25. Carbon monoxide 26. Silicon dioxide 27. Sodium bicarbonate 28. Copper(II) nitrate
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regina is writing an argument against adding fluoride to the citys drin…
A. Because the Food and Drug Administration has stated in 2000 that fluoride is a drug subject to regulation when it is "used in the diagnosis, cure, mitigation, treatment, or pre…
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select the text that has a more objective tone. even after the populati…
The second text ("The balmy winters of Southern Arizona draw visitors and temporary residents from around the world for travel or adventure. Moreover, climate drives agriculture. …
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a polar covalent bond has a partial charge. true false
True
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following chemical formulas. 16. cacl₂= 17. pbo= 18. v₂o₅= 19. ni₃o₃= 2…
16. Calcium chloride 17. Lead (II) oxide 18. Vanadium (V) oxide 19. Nickel (II) oxide 20. Mercury (I) chloride 21. Permanganate ion 22. Dichromate ion
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3. which among the following is not a recommendation by paul r. ehrlich…
C. Encourage couple to have more children
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3. which among the following is not a recommendation by paul r. ehrlich…
C. Encourage couple to have more children # Brief Explanations: Paul R. Ehrlich focused on reducing population growth. Encouraging couples to have more children would increase the…
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12. nh₄cl = ammonium chloric 13. na₂co₃ = sodium carbon 14. h₃po₄ = 5. …
14. Phosphoric acid 15. Potassium sulfate
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select the text that has a more objective tone. no planet or star or ga…
The second text (Outer space is just what its name implies. It is the void that lies beyond the uppermost reaches of the atmosphere of Earth and between all other objects in the u…
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the ph of a solution of koh is 11.36. what is the concentration of oh⁻ …
\(2.29\times 10^{-3}\space M\)
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the ph of a solution of hbr is 3.21 at 25°c. what is the h+ concentrati…
\(6.17\times 10^{-4}\space M\)
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32. examine the elements listed below and identify the one element that…
32. c) Ti 33. c) discovered the existence of electrons 34. c) contains exactly 18 neutrons 35. a) Most of the atom's mass and all of its positive charge is contained in a small co…
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the ph of a solution of hbr is 3.21 at 25°c. what is the h⁺ concentrati…
\(6.17\times 10^{-4}\space mol/L\)
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calculate the ph of a 0.00084 m solution of hbr at 25.0 ^{circ}c.
\(3.05\)
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directions: write the correct name for the following chemic 1. kno₃ = 2…
1. potassium nitrate 2. copper(II) chloride 3. sodium sulfate 4. aluminum chloride 5. calcium hydroxide 6. sodium phosphate 7. sulfur trioxide 8. iron(II) oxide 9. copper(II) oxid…
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what do we call groups of atoms whose magnetic poles are lined up? mole…
B. Domains
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27. in which of the following sets are the symbol of the element, the n…
The average atomic mass of ruthenium is \(101.064\) amu. Looking at the periodic table, the average atomic mass of ruthenium (\(Ru\)) is approximately \(101.07\) amu. So, this is …
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27.in which of the following sets are the symbol of the element, the nu…
The average atomic mass of ruthenium is approximately \(101.07\) amu. Looking at the periodic table, the atomic mass of ruthenium (\(Ru\)) is about \(101.07\) amu, so this is the …
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fallen leaves and water quality adapted from u.s. geological survey (us…
It introduces the importance of timing when removing leaf litter. It highlights the effectiveness of the leaf removal program.
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what did ernest rutherfords gold foil experiment demonstrate about atom…
Their positive charge is located in a small region that is called the nucleus.
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match each molecule with its chemical symbols. drag & drop the answer c…
- Carbon Dioxide: \(CO_2\) - Water: \(H_2O\) - Oxygen: \(O_2\) - Glucose: \(C_6H_{12}O_6\)
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which statement best describes john daltons use of creativity in his wo…
He reinterpreted and retested Joseph Proust's results.
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which scientist provided a foundation for john daltons work on the atom…
Joseph Proust
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which atomic model was proposed as a result of j. j. thomsons work? the…
the plum pudding model
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how did the development of the earliest idea about atoms differ from th…
It was based on the thoughts of an early philosopher.