化学
化学反応、化学量論、分子構造、元素の性質。
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answer a series of questions about the following scenario: woof woof ba…
A. 4.55% lower than budgeted
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hmis safety module quiz sc/nats 1830 a - mysteries of everyday material…
True
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part ii. observation. use your sense of sight and smell to make some ob…
### Identifying Liquid #1: - **Observation**: Colorless, no odor. - **Compare with Known Substances**: Water has density 1.0, is clear/colorless, and has no odor. Hydrogen peroxid…
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a 50.00 g sample of an unknown metal is heated to 45.00°c. it is then p…
The correct equation is $C_{\text{p,metal}} = \frac{-m_{\text{cal}}C_{\text{p,cal}}\Delta T_{\text{cal}}}{m_{\text{metal}}\Delta T_{\text{metal}}}$ (the first given equation). ###…
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4fe + 3o₂ → 2fe₂o₃ how can the equation be analyzed to show which chara…
Same ### 2. Number of Oxygen atoms
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1.05 - test review - counting atoms 2h₂o → 2h₂ + o₂ ? g 10.28 g 10.08 g…
20.36 g
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1.05 - test review - counting atoms + 3h₂ → 2nh₃ coefficient (label poi…
C. subscript, atoms
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1.05 - test review - counting atoms + 3h₂ → 2nh₃ coefficient subscript …
B. Molecules
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30 multiple choice 2 points which of the molecules below can be properl…
D. \( \text{CH}_3\text{CH}_2\text{NHCH}_3 \)
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nube violeta. c. el triyoduro de nitrógeno está com elementos distintos…
D. \( 2NI_3 ightarrow N_2 + 3I_2 \) ### Question 12
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1.05 - test review - counting atoms two liquids were mixed and formed a…
C. Precipitate
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consumers have long been advised to search nutritional labels for exces…
B. detrimental
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multiple choice 2 points the conjugate acid of so₄²⁻ is ______. h₃so₄⁺ …
B. $\ce{HSO4-}$
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28 multiple choice 2 points what intermolecular forces is present in me…
C. both London dispersion forces and hydrogen bonding
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f model: single white circle + double gray circle → white circle with t…
# Explanation: ## Step1: Recall the Law of Conservation of Mass The Law of Conservation of Mass states that in a chemical reaction, the total number of atoms of each element on th…
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27 multiple choice 2 points which of the following statements is correc…
B. molecules with similar intermolecular forces will mix freely
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osmolarity of a 1 m solution of ethanol c₂h₅oh is: ○ 3 ○ 0 ○ 1 ○ 2
1 (corresponding to the option "1")
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1.05 - test review - counting atoms how many atoms in all, are in the m…
9
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snc2p chemistry unit name: * the ghs system also defines an environment…
a. Compressed gas - 4 b. Biohazardous infectious material - 6 c. Flammable and combustible material - 3 d. Corrosive material - 1 e. Oxidizing material - 8 f. Poisonous and infect…
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multiple answer 2 points which of the functional groups below contain a…
B. alcohol, D. carboxylic acid
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1.05 - test review - counting atoms how many total atoms are in one mol…
13
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25 multiple choice 2 points what kind of molecular orbital results when…
A. $\pi$
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1.05 - test review - counting atoms how many total atoms are in one mol…
12
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a silver ring reacts with compounds containing sulfur in the air to for…
A. The liquid solution changed color
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24 multiple choice 2 points how many carbon-carbon σ bonds are present …
3 (corresponding to the option with 3)
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1.05 - test review - counting atoms how many oxygen atoms are in the mo…
12 (corresponding to the option "12")
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a compound secreted by honeybees to paralyze intruders in their hive is…
7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom (the first option)
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the table shows the chemical formulas for four substances. | substance …
Substances 1 and 3
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multiple answer 2 points which of the class of organic compound below c…
A. carboxylic acid, C. ester, D. ketones, E. aldehyde
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which chemical reaction involves the fewest oxygen atoms? ○ ( 2\text{ag…
The reaction \(\boldsymbol{\text{C}_2\text{H}_4 + 3\text{O}_2 ightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}}\) involves the fewest oxygen atoms (6 total).
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multiple choice 2 points which of the following has the highest boiling…
The compound with the -OH group (the fourth option in the multiple - choice) has the highest boiling point.
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instrucciones: lee el pasaje. luego lee cada preg y elige la mejor resp…
B. El triyoduro de nitrógeno explota y despide una nube violeta. ### Question 11
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what kind of molecular orbital results when the two atomic orbitals sho…
π (the option with "π")
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multiple choice 2 points based on the structure below, what is the valu…
\(109^\circ\) (the option with \(109^\circ\))
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19 multiple choice 2 points clonazapam is used to treat seizures and pa…
A. 2
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which of the following best describes the relationship between the two …
They represent the same compound.
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multiple choice 2 points the synthetic steroid ru-486 is shown below. h…
8 (corresponding to the option with 8)
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16 multiple choice 2 points which of the following compounds has the hi…
cyclopentane
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15 multiple choice 2 points which molecule below is an alkene? (ch₃)₂ch…
$\boldsymbol{(CH_{3})_{2}C = CH_{2}}$ (the last option)
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how many valence electrons does lithium (li) have available for bonding…
A. 1
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which is the noble gas notation for chlorine? ○ ne 4s² 4p⁵ ○ ne 3s² 3p⁵…
[Ne] \( 3s^2 3p^5 \)
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what is the number of valence electrons in cadmium (cd)? ○ 1 ○ 2 ○ 10 ○…
2
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14 multiple choice 2 points which of the following compounds has the hi…
B. The compound with two F atoms attached to the carbon adjacent to the carboxyl group (the second structural formula among the options).
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13 multiple choice 2 points what intermolecular forces are present amon…
both London dispersion forces and dipole - dipole forces
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which is the electron configuration for nobelium (no)? ○ rn7s²5f¹⁴ ○ rn…
A. $[\text{Rn}]7\text{s}^25\text{f}^{14}$
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12 multiple choice 2 points a brønsted-lowry base is defined as a subst…
B. acts as a proton acceptor
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the electron configuration of nitrogen (n) is ○ ( 1s^2 2s^2 2p^3 ) ○ ( …
A. $1s^{2}2s^{2}2p^{3}$
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which of the molecules below is an ester? ○ ch₃och₂ch₂ch₃ ○ ch₃cooch₃ ○…
B. \( \text{CH}_3\text{COOCH}_3 \)
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in which block of the periodic table is uranium (u) found? ○ s block ○ …
f block
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shown below is one of the sex pheremones from the butterfly family. how…
5
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which is the noble-gas notation for lead (pb)? ○ rn6s²4f¹⁴5d¹⁰6p² ○ rn6…
[Xe]$\boldsymbol{6s^2 4f^{14} 5d^{10} 6p^2}$ (the third option: [Xe]$\boldsymbol{6s^2 4f^{14} 5d^{10} 6p^2}$)
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2 select the correct texts in the passage. which two details best shape…
1. Many historical events have occurred at the presidential retreat: the planning of the Normandy invasion, Eisenhower - Khrushchev meetings, Camp David Accords with Menachem Begi…
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9 multiple choice 2 points which atomic orbital combination would resul…
The third option (the one with the two orbitals that have a symmetric, head - on - like overlap representation, e.g., the option with $\infty+\infty$ where the orbitals are orient…
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it is easier to determine the electron configurations for the p-block e…
B. their electrons are assigned to s and p orbitals only.
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the following are the broad classes of organic compounds except: organi…
D. organic compounds composed of hydrogen only
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which of these elements has an electron configuration of kr5s²? ○ bariu…
strontium
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7 multiple choice 2 points strong acids dissociate completely in water.…
C. \( \ce{CH3OH} \)
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multiple answer 2 points identify the functional groups in the structur…
A. carboxylic acid, B. aromatic hydrocarbon, C. Alcohol, F. amide
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which one of the molecules shown below has no net molecular dipole mome…
\( \boldsymbol{\text{H}_2\text{CCH}_2} \) (or \( \boldsymbol{\text{H}_2\text{C}=\text{CH}_2} \), ethene)
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which is the electronic configuration for oxygen? ○ $1s^2 2s^2 2p^1$ ○ …
\(1s^2 2s^2 2p^4\) (the third option: \(1s^2 2s^2 2p^4\))
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multiple choice 2 points which sequence ranks the following isomers in …
3<1<2
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3 multiple choice 2 points shown below is one of the sex pheremones fro…
0 (corresponding to the option "0")
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19 wearing sandals is appropriate attire for a science lab. a true b fa…
B. False ### Question 20:
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17 in a science lab, it is safe to smell chemicals directly to identify…
B. False
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2 multiple choice 2 points how many σ bonds does the compound shown con…
10 (the option with 10)
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in the structure below, the sigma bond of the carbonyl is formed from t…
A. \( sp^2, sp^2 \)
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look up any chemical’s sds (msds) form online. on one side of a blank p…
To complete this task, here's a step - by - step guide: ### Step 1: Select a Chemical Pick a common chemical, for example, sodium hydroxide (NaOH). ### Step 2: Find the SDS (MSDS)…
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16 if you do not understand the instructions for an experiment, what sh…
A. Ask the teacher for clarification. ### Question 17
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why is it important to tie back long hair in the science lab? a to keep…
C. To prevent it from catching fire or dipping into chemicals ### Second Question (unsafe action with open flames):
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12 which of the following is a basic safety rule to follow in a science…
A. Always wear safety goggles. ### Question 13 (What should you do immediately if a chemical spills on your skin during an experiment?)
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a sample of an unknown substance has a mass of 89.5 g. if 345.2 j of he…
\( 0.193 \)
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select the correct name of this class: a. oxidizing material b. corrosi…
c. Compressed Gases
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one of the ways to make 550 ml of a 0.077 m solution of sodium chloride…
60.7 mL of the stock solution and 489 mL of water.
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question 11 what does gibbs free energy (g) represent in a chemical rea…
C. The chemical potential energy ### QUESTION 12
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complete the ion symbol for the atom below. submit your answer
\(\boxed{^{17}_{8}\text{O}^{2-}}\) (Note: If the neutron count is different, adjust. But assuming the diagram has 8 protons, 9 neutrons, 10 electrons, this is the ion for oxygen-1…
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question 10 what is the change in gibbs free energy for a reaction in w…
\(-1.1\times 10^{5}\ J\) (corresponding to the option \(-1.1 \times 10^{5}\ J\))
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question 9 a reaction is spontaneous if δg is equal to zero. greater th…
C. Less than zero. (Here we assume the options are labeled as A. Equal to zero, B. Greater than zero, C. Less than zero, D. Equal to the $\Delta H$ of the system)
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question 8 what determines the spontaneity of a reaction? the sign of δ…
The sign of $\Delta G$.
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give the ion symbol for the ion that has 82 protons and 80 electrons.
\( \text{Pb}^{2+} \)
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interpreting specific heat values | substance | ( c_p ) (j/g·°c) | |---…
Fe: 4 Al: 5 Cu: 3 Sn: 2 Pb: 1
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give the ion symbol for the ion that has 16 protons and 18 electrons.
\(\text{S}^{2-}\)
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question 7 for the combustion of ethylene, why does entropy decrease? b…
A. Because the products are more ordered than the reactants.
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give the ion symbol for the ion that has 16 protons and 18 electrons.
\(\ce{S^{2-}}\)
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question 6 in the context of entropy, what does a negative δs indicate …
The reaction leads to a decrease in disorder.
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check all of the following statements that are true about the ion whose…
To solve this, we analyze each statement about the \( \ce{F^-} \) ion: ### Step 1: Protons in Fluorine Fluorine (F) has an atomic number of 9, so a fluorine atom (and its ion \( \…
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question 5 which of the following reactions will have positive change i…
The reaction with a positive change in entropy is $\boldsymbol{CaCO_3 (s) ightarrow CaO (s) + CO_2 (g)}$ (the first option).
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hmis safety module quiz sc/nats 1830 a - mysteries of everyday m questi…
c. All of the above
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if a reaction has more moles of gas on the products side compared to th…
A. increases
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how many electrons would be found in the ion whose symbol is given belo…
10
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question 3 how can the entropy change for a reaction be predicted witho…
A. By comparing the moles of gaseous reactants and products.
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true or false: the standard molar entropy of a pure element in its stan…
False
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question 1 which property of entropy allows it to be calculated from re…
B. Its status as a state function.
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6b. explain how the kinetic energy of the molecules in the instant hot …
When heat transfers from the instant hot pack to the cold bench (as in 6a, assuming heat flows from hot to cold), the molecules in the instant hot pack lose thermal energy. Since …
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complete the ion symbol for the atom below.
\( \ce{^{14}_{7}N^{-}} \) (or \( \ce{^{15}_{7}N^{-}} \) if neutrons are 8; but likely \( \ce{^{14}_{7}N^{-}} \) as nitrogen-14 is common)
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based on the bond energies for the reaction below, what is the enthalpy…
\boxed{-1222}
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check all of the following statements that are true about the ion whose…
- The ion has 20 protons. - The ion has lost two electrons.
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using the equations $ce{h2(g) + f2(g) -> 2 hf(g)}$ \t $delta h^circ = -…
299.7
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give the ion symbol for the ion that has 15 protons and 18 electrons.
\( \text{P}^{3-} \)
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this quiz: 49 point(s) pos... this question: 7 point(s)... 4 of 7... pl…
Hand line ### Question 2
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determine whether each of the properties described applies to volumetri…
volumetric ### For "Capable of measuring a range of volumes of liquid":