Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what is the correct name for the compound fe₂o₃? iron (ii) oxide iron o…
Iron (III) oxide
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which of the following is the correct name for cuo? copper (iii) oxide …
Copper (II) oxide
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what is the correct name for the compound mno? manganese dioxide mangan…
Manganese (IV) oxide
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the structure of the atom (continued) 12. magnesium has three isotopes.…
The percent abundance of magnesium - 25 is \(10\%\)
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which formula corresponds to lead (iv) oxide? pbo pb₂o₄ pb₂o pbo₂
\(PbO_2\) (the fourth option)
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what is the correct name for the compound with the formula sncl4? tin (…
Tin (IV) chloride
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what is the formula for chromium (vi) oxide? cro₂ cr₂o cro₃ cr₂o₃
\(CrO_{3}\) (the third option)
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which of the following formulas represents manganese (iv) sulfide? mns₂…
\(MnS_{2}\)
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11. use the table below to calculate the atomic mass of element x. then…
The atomic mass of element \(X\) is approximately \(16.00\) amu. Looking at the periodic table, the element with an atomic mass close to \(16.00\) amu is oxygen (\(O\)).
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10. neon has two isotopes: neon - 10 and neon - 12. a. which isotope ha…
a. Neon - 12. b. Neon - 12. c. Neither, they have the same number of protons. d. Neither, they have the same number of electrons.
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9. give the atomic number of each isotope. a. magnesium - 25 b. bromine…
a. \(12\) b. \(35\) c. \(51\)
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8. give the mass number of each isotope. a. be with 5 neutrons b. ga wi…
a. \(9\) b. \(70\) c. \(30\) d. \(48\)
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2. describe the property of water that is indicated by the data. how is…
3. The sand would feel warmer. Sand has a lower specific heat capacity than water. Specific heat capacity is the amount of heat energy required to raise the temperature of a subst…
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directions: drag a coefficient to each box. each box must have a coeffi…
2, 3, 3, 1
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6. how many more neutrons does thorium - 230 have than protons? how man…
Thorium - 230 has 50 more neutrons than protons and 90 electrons.
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hester, treyvon dtal - ch - term 1 - unit 5a assessment 25 - 26 __ca(no…
B. 2
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hester, treyvon dtal - ch - term 1 - unit 5a assessment 25 - 26 8 of 15…
B. 2
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5. how many neutrons does europium - 151 have? what is the isotopes mas…
The mass number is \(151\). The number of neutrons is \(88\).
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balance the following reaction: fe + o₂ → fe₂o₃
$4Fe + 3O_2 ightarrow 2Fe_2O_3$
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predict the product(s) of the double replacement reaction below: calciu…
Calcium oxide (\(CaO\)) and sodium bromide (\(NaBr\))
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predict the product(s) of this single replacement reaction: 2 al + 6 hc…
C. \(2\text{AlCl}_3 + 3\text{H}_2\)
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h₂so₄(aq) + koh(aq) ---> k₂so₄(aq) + 2h₂o(l) which type of chemical rea…
Neutralization
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which of the following is a combustion reaction? c10h16 (l) + 8 cl2 (l)…
D. \(C_7H_{16(l)} + 11O_{2(g)} \to 7CO_{2(g)} + 8H_2O_{(g)}\)
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what type of reaction is shown below? 2 nabr (aq) + cl₂ (g) → 2 nacl (s…
single replacement
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what type of reaction is shown below? 2 kclo3 (s) → kcl (s) + o2 (g) do…
decomposition
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which characteristic of an element determines its placement in the peri…
B. number of protons
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from emily dickinson, \a light exists in spring\ when march is scarcely…
AABB
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from christina rossetti, \ferry me across the water\ ill ferry you.\ \i…
AABB
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j. j. thomson described the atom as having positive charges scattered t…
B. Scientists were able to use technological advancements and labs to explore the atom more.
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a model of a helium (he) atom is shown below. which numbered part of th…
B. 3
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which property of an element is determined by adding the number of prot…
D. atomic mass
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using the periodic table, which statement is correct? a iron (fe) has m…
D. Sodium (Na) has more protons than carbon (C).
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according to the periodic table of the elements, which set of elements …
D. He, Ne, Ar
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the primary distinction between system software and application softwar…
1. System software manages computer resources; application software is designed to execute specific user tasks. 2. Utility Program, which performs system maintenance and optimizat…
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chemicals are a danger to animals. what who
what
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the numbers after the element symbol (blue boxes in picture) is called …
subscript
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cations have positive charges. anions have negative charges. what force…
ionic attraction
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is this chemical equation \balanced\ or \unbalanced\? nabr + naf + cabr…
Unbalanced
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covalent bonds electrons. o lose or gain o share o dont have any
share
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ionic bonds electrons. lose or gain share dont have any
lose or gain
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is this chemical equation \balanced\ or \unbalanced\? 4fe + 3o₂↑ 2fe₂o₃…
Balanced
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in a 2020 paper, arya udry et al. cautioned that although similarities …
A. proxies for
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how is mechanical weathering best described? the buildup of chemical de…
the breakdown of rock through mechanical disintegration and physical stress
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what characteristic makes a substance a mineral? it has a definite chem…
It has a definite chemical composition.
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chemistry are the two analytical branches that are important to forensi…
Qualitative and quantitative
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tandem mass spectrometry combines the use of a gas spectrometer and a _…
mass spectrometry
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is analyzed by qualitative methods. the method used by the suspect to k…
The identity of the poison used in a murder
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forensic______may be asked to study the source of heavy - metal polluti…
A. chemists
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question # 10 multiple choice one of the greatest values of modern anal…
the instrumentation and data can easily be managed with a computer
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question # 8 multiple choice quantitative analysis is carried out by a …
mass spectrometry
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question # 7 multiple choice tandem mass spectrometry is used to obtain…
greater accuracy
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question # 5 multiple choice an entry - level forensic chemist must hav…
a college degree and forensic experience
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question # 4 multiple choice metrology as a study of ______ is very imp…
measurement
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question # 3 multiple choice analytical chemistry has two branches, ___…
qualitative and quantitative
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multiple choice qualitative analytic methods are needed to determine___…
the identity of the poison used in a murder
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15) read the following scenario. then, choose the best answer. joanna h…
formal
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14) read the following scenario. then, choose the best answer. joanna h…
private conversations
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13) read the following scenario. then, choose the best answer. joanna h…
spoken
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12) read the following scenario. then, choose the best answer. joanna h…
sensitive
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5. what causes the dipole arrow become larger as shown in the pictures …
The higher electronegativity of atom B.
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part b: completion write the correct term in the blank to complete each…
1. protons 2. isotopes 3. \(BF_{3}\)
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a chemist prepares a mixture of dioxane and toluene at a temperature of…
\(24\%\)
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a chemist mixes 69.1 g of water with 98.1 g of butanoic acid and 73.1 g…
| component | mass percent | |--|--| | water | $28.8\%$ | | butanoic acid | $40.8\%$ | | acetone | $30.4\%$ |
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fix any errors in these proposed electron configurations. number of ele…
| number of electrons in atom | corrected electron configuration | |---|---| | 13 | \(1s^{2}2s^{2}2p^{6}3s^{1}\) | | 9 | \(1s^{2}2s^{2}2p^{5}\) | | 11 | \(1s^{2}2s^{2}2p^{6}3s^{1}…
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imagine an electron in the 4d orbital of a neutral atom. decide how wel…
An electron in a \(2s\) orbital > An electron in a \(4s\) orbital > An electron in a \(2p\) orbital > An electron in another \(4d\) orbital.
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the first five ionization energies (ie₁ through ie₅) of a period 2 elem…
\(B\)
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complete the following table: two polyatomic anions name chemical formu…
| name | chemical formula | | ---- | ---- | | hypobromite anion | \( \text{BrO}^- \) | | nitrite anion | \( \text{NO}_2^- \) |
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1 describe how the atomic radius(size) and the ionization energy change…
- **Atomic radius**: - **Within a group**: Increases. - **Within a period**: Decreases. - **Ionization energy**: - **Within a group**: Decreases. - **Within a period**: Increases.
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why do these trends matter? they determine how each element reacts with…
The content explains how electronegativity differences determine if atoms transfer (ionic bonding, e.g., Na - Cl forming salt) or share electrons (covalent bonding, e.g., H - O fo…
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what are the relationships between the size of elements and the ionizat…
- Relationship between element size and ionization energy: As atomic size increases, ionization energy decreases. - Reason for the relationship: Weaker electrostatic attraction (d…
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1. explain the trend in atomic radius. left to right its gets smaller a…
1. Across a period (left - right), atomic radius decreases (effective nuclear charge increases). Down a group, it increases (new electron shells). 2. New electron shells are added…
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49. write the balanced formula and net ionic equation for the reaction …
- **a** - Balanced formula: \(CuSO_4(aq)+Na_2S(aq)=CuS(s)+Na_2SO_4(aq)\) - Net ionic: \(Cu^{2 +}(aq)+S^{2-}(aq)=CuS(s)\) - Spectator ions: \(Na^{+}\) (grey), \(SO_4^{2-}\) (light …
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how could we identify whether a covalent compound is polar or nonpolar?…
by analyzing its solubility
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what property is the polar covalent compound so₂ likely to exhibit? str…
Brittleness in the solid phase
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which property do nonpolar covalent and polar covalent compounds demons…
insulator
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what property causes covalent compounds to be brittle? strong metallic …
weak intermolecular forces
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45. when the following solutions are mixed together, what precipitate (…
a. No precipitate forms. b. \(Al(OH)_{3}\) precipitates. c. \(CaSO_{4}\) precipitates. d. \(NiS\) precipitates.
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45. when the following solutions are mixed together, what precipitate (…
a. No precipitate. b. \(Al(OH)_{3}\) precipitate. c. \(CaSO_{4}\) precipitate. d. \(NiS\) precipitate.
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44. on the basis of the general solubility rules given in table 4.1, pr…
a. Soluble; b. Soluble; c. Insoluble; d. Soluble; e. Insoluble; f. Insoluble; g. Insoluble; h. Soluble
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44. on the basis of the general solubility rules given in table 4.1, pr…
a. Soluble, b. Soluble, d. Soluble, h. Soluble
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precipitation reactions 43. on the basis of the general solubility rule…
a. Soluble; b. Soluble; c. Soluble; d. Insoluble; e. Insoluble; f. Insoluble; g. Insoluble.
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question 12 (1 point) which type of reaction releases energy spontaneou…
d. Exothermic
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select the correct answer claire was rushed to the hospital when she su…
C. angina
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9. what is the percent composition of na₂co₃?% na =% c =% o =
\(\%\space Na\approx43.4\%\), \(\%\space C\approx11.3\%\), \(\%\space O\approx45.3\%\)
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select the correct answer. gloria has excessive facial hair. which trea…
C. laser treatment
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b. mgbr₂ 184.11g/mol 4. what do we use to convert between grams and mol…
Molar mass.
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8. complete the following table and use it for the calculations below. …
a) \(142.05\ g/mol\) b) \(0.0945\ mol\) c) \(5.69\times10^{22}\) molecules d) \(1.14\times10^{23}\) atoms
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4. what do we use to convert between grams and moles (g→mol or mol→g)? …
\( 3.75\ mol \)
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3. find the mole weight of: a. lioh b. mgbr₂ c. ca(no₃)₂ d. al₂(co₃)₃
a. \(23.95\ g/mol\) b. \(184.11\ g/mol\) c. \(164.10\ g/mol\) d. \(233.99\ g/mol\)
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multiple - choice question did mendeleev believe in atoms? no. yes. rew…
Yes.
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part ii: converting grams to moles - using the mw from part i, determin…
1. \(0.211\ mol\) 2. \(0.313\ mol\) 3. \(0.308\ mol\) 4. \(0.00876\ mol\) 5. \(0.749\ mol\)
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part ii: converting grams to moles - using the mw from part i, determin…
1. \(0.211\space mol\) 2. \(0.3125\space mol\) 3. \(0.307\space mol\) 4. \(0.00873\space mol\) 5. \(0.75\space mol\)
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multiple - choice question noble gases are... metals. unreactive. radio…
unreactive.
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practice 3.2 part i: mole weight - determine the mole weight of the fol…
1. \(142.07\ g/mol\) 2. \(79.91\ g/mol\) 3. \(357.49\ g/mol\) 4. \(125.56\ g/mol\) 5. \(60.09\ g/mol\)
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select the correct answer doctors have diagnosed ana with a cardiac dis…
C. Ischemia
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1. find the percent composition of each compound as given: a. % o in fe…
1. a. Approximately $22.3\%$ 1. b. Approximately $74.5\%$ 1. c. Approximately $74.8\%$ 1. d. Approximately $23.6\%$ 1. e. Approximately $97.2\%$ 2. a. $14.12$ g 2. b. Approximatel…
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select the correct answer. a patient suffering from a spinal fracture d…
D. vertebroplasty
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what are zombie fires (4 minutes) for partici... getting started play t…
Peatlands; partially decayed organic matter
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potassium - 40 has a half - life of 1.277 × 10^9 years. after 1.022 × 1…
\(1.95\) g
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a radioactive nuclide is used to detect eye tumors. an atom of this rad…
\(\ce{^{32}_{15}P}\) (the third option in the given choices)