化學
化學反應、化學計量、分子結構與元素性質。
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fill in the missing words a solution of hcl with an unknown concentrati…
\( 0.3773 \)
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complete the table to determine the number of subatomic particles in th…
Protons: 37 Neutrons: 48 Electrons: 36
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complete the table to determine the nuclear symbol for this neutr nucle…
Nuclear symbol: \(\boldsymbol{_4^9Be}\) (or \(\ce{_4^9Be}\)); Element: Beryllium (Be)
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complete the table to determine the nuclear symbol for this neutral ato…
Nuclear symbol: \( \boldsymbol{_{48}^{113}\text{Cd}} \), Element: Cadmium (Cd)
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complete the table to determine the nuclear symbol for this neutral ato…
Nuclear symbol: $^{27}_{13}\text{Al}$; Element: Aluminum (Al)
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complete the table to determine the nuclear symbol for this neutral ato…
Nuclear symbol: $\boldsymbol{\ce{^{19}_{9}F}}$; Element: Fluorine (F)
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complete the table to determine the nuclear symbol for this neutral ato…
The nuclear symbol is $\boldsymbol{_{27}^{59}\text{Co}}$, and the element is Cobalt (Co).
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fill in the missing words compare properties of two solutions. solution…
First blank: less Second blank: A Third blank: A
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(d) lequel a un plus grand volume: 300 g dor ou 300 g daluminium? expli…
300 g of aluminium has a larger volume.
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nombrar el compuesto (handwritten text) and a chemical structure (hepta…
1,3,5 - Cycloheptatriene (or Cycloheptatriene)
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question 16 match each rhyme scheme with the type of sonnet it represen…
1. ABABCDCDEFEFGG - Spenserian 2. ABBAABBA CDECDE - Petrarchan 3. ABABBCBC EDEDEE - Shakespearean
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4. complete y nombre el producto de las siguientes reacciones: a) $ce{c…
### Parte a) #### Explicación: La reacción es una adición electrófila de HBr a un alqueno (2 - penteno, \(\ce{CH3CH2CH=CHCH3}\)). Según la regla de Markovnikov, el hidrógeno (del …
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assessing ecological succession after a wildfire visit the link below a…
Secondary succession occurs faster than primary succession because the soil (and often residual organic matter, seeds, roots) remains intact after the disturbance (e.g., wildfire)…
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which option correctly shows the bond angle of a linear molecule? (1 po…
180 degrees (the option with "180 degrees")
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a central atom has two lone pairs on opposite sides and four single bon…
A. square planar
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atomic composition of molecules which type of model best represents sim…
Lewis dot
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which is an example of a polymer? (1 point) ○ sodium chloride ○ carbon …
The option representing a polymer is: cellulose (the option with "cellulose" text).
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atomic composition of molecules quick check which phrase correctly desc…
the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds
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a student has samples of two pure compounds, xclo₃ and zclo₃, which con…
A. Which has the greater molar mass, X or Z?
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a student has two samples of nacl, each one from a different source. as…
A. Which sample has the higher purity?
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two different ionic compounds each contain only copper and chlorine. bo…
B. What is the formula unit of each compound?
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a student is given two 10g samples, each a mixture of only nacl(s) and …
B. The mass of Cl in each mixture
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a 5.0 g sample of mgcl₂ may contain measurable amounts of other compoun…
D. The mass of Mg and the mass of Cl in the sample
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2 mark for review 1\t2\t3\t4\t5\t6\t7 total mass of sample (g)\tmass of…
C. 3, 4, 6, 7
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history of the atom worksheet write the name of the scientist who is cr…
**: J.J. Thomson #### 2. Discovered the nucleus:
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14 fill in the missing words in an acidic solution the concentration of…
First blank: greater; Second blank: lower
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question 2 1.25 pts a fellow classmate asks you to check their work. th…
They made a mistake in their conversion. Their answer is 10 times too high.
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a sample of ethanol (c₂h₆o) has a mass of 0.2301 g. complete combustion…
\(6.62\) (or \(6.615\))
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(10pts) draw all isomers of c₆h₁₄ using the line-angle formula. there a…
To solve the problem of drawing all isomers of \( \ce{C6H14} \) (hexane) using the line - angle formula and providing their IUPAC names, we follow these steps: ### Step 1: Recall …
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determine the number of significant figures in the measurement 0.090 s.…
45.0
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you are asked to convert 37.5 milligrams (mg) into grams. how would you…
Multiply 37.5 mg by 1 g/1000 mg
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number | significant figures | explanation 23.56 | 4 | all nonzero digi…
5 ### Part B
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question 10 10 pts true or false? molarity, osmolarity, and osmolality …
True
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hmis safety module quiz sc/nats 1830 a - mysteries of everyday material…
c. Inhalation
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answer a series of questions about the following scenario: woof woof ba…
The cost of goods sold was lower than the budget by $144.
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hmis safety module quiz sc/nats 1830 a - mysteries of everyday material…
A. True
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hmis safety module quiz sc/nats 1830 a - mysteries of everyday material…
False
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hmis safety module quiz question 1 not yet answered marked out of 1.00 …
b. open - toed shoes
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un estudiante sabe que la solubilidad generalmente aumenta a medida que…
A. Tendrá mayor solubilidad.
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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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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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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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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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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of \( e \)) | approximate mass (amu) | location on diagram | |----------|--------|----------------------------------|-----------------------…
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answer the following questions in the space provided. 24. explain how c…
Chemicals and chemical reactions are essential. Digestion (enzymes break food), respiration (glucose + O₂ produces energy), cleaning (detergents react with dirt), and photosynthes…
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5 why does rita describe the properties of elements that make up a comp…
B. To demonstrate how the properties of elements change after becoming a compound
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fill in the blank question geologic and organic materials that store, o…
sinks
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question 8 of 25 which of the following contains chemical energy? a. mo…
B. Food
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what is the shape of the following molecular structure? trigonal pyrami…
Trigonal Pyramidal
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what is the molecular geometry of bcl₃? tetrahedral trigonal pyramidal …
The molecular geometry of \( BCl_3 \) is trigonal planar. So the correct option is the one labeled "trigonal planar".
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draw the lewis dot structure for sif₃. then carefully compare your draw…
The correct Lewis dot structure is the one on the purple card (second from the top, with Si bonded to three F atoms, 2 lone electrons on Si, and each F with three lone pairs).
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h-c≡c-h(g) + 2hi(g) → product structure using the table of average bond…
\(-217 \, \text{kJ}\)
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unit 2 hw, part 2: mcq. remember to log your responses on my ap. it doe…
D. There is ionic bonding between \( \text{Mg}^{2+} \) ions and \( \text{NO}_3^- \) ions. ### Question 2