Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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1. find the key at the top of the page. what does each color represent …
1. Without seeing the key, we can't give specific color - charge relationships. But generally, red might indicate partial negative charge and blue might indicate partial positive …
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ionic or molecular? 1. identify the types of atoms in each compound as …
| Chemical formula | Metal or non - metal elements? | Ionic or molecular compound? | |---|---|---| | SrCl₂ | Metal (Sr), Non - metal (Cl) | Ionic | | P₂O₃ | Non - metal (P), Non -…
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the following text is adapted from herman melvilles 1857 novel the conf…
B. It presents an account of a misunderstanding.
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identify the species oxidized, the species reduced, the oxidizing agent…
Species oxidized: $Co$ Species reduced: $Sn^{2+}$ Oxidizing agent: $Sn^{2+}$ Reducing agent: $Co$ Electrons are transferred from: $Co$ to: $Sn^{2+}$
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match each species on the left to a description on the right. clear all…
$H_2O_2$ - oxidizing agent $Al$ - reducing agent $MnO_4^-$ - oxidizing agent $Zn$ - reducing agent
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54. which of the following is a conditional amino acid? tyrosine aspara…
54. Tyrosine 55. They dissolve easily in water.
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ni^{2 + }+so_{4}^{2 - }\to nio_{2}+so_{2} in the above redox reaction, …
Name of the element oxidized: Nickel Name of the element reduced: Sulfur Formula of the oxidizing agent: $\text{SO}_{4}^{2 - }$ Formula of the reducing agent: $\text{Ni}^{2 + }$
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use the following information to answer the next two questions. a sampl…
2. 6.00 L 3. 6.00 L
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1. a 4.05 g sample of a compound containing c, h, and o was burned comp…
B. $C_7H_{14}O$
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elements diary choose an element from the periodic table and write a se…
For example, if we choose oxygen (O): **Day 1** I am Oxygen, a member of Group 16, also known as the chalcogens. Life in this group is interesting. We all have a strong desire to …
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the density of a gas under constant pressure depends on temperature. ho…
(a) Domain: $0, 27, 60, 80, 115$; Range: $1.464, 1.274, 1.201, 1.101, 1.016$ (b) $0 ightarrow1.464$, $27 ightarrow1.274$, $60 ightarrow1.201$, $80 ightarrow1.101$, $115 ightarrow1…
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classify the following reaction and balance the equation by entering th…
$2$; $1$; $1$; $2$
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1. carbohydrates are inorganic compounds. true false 2. symptoms of a h…
1. False 2. Drop in heart rate 3. False
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19) one serving of alcohol (beer, wine, or liquor) contains roughly ___…
19) C. 15 20) A. Fermentation
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for the following reaction, 67.1 grams of silver nitrate are allowed to…
What is the maximum amount of silver chloride that can be formed? 53.6 grams What is the FORMULA for the limiting reagent? $CuCl_2$ What amount of the excess reagent remains after…
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use the following information to answer the next question. 1. ideal gas…
1468
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18 question (1 point) complete the fischer projection that matches the …
Without the actual correct placement shown in the answer options, a specific answer cannot be given. But the process involves carefully analyzing the spatial orientation of groups…
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for the following reaction, 19.4 grams of iron are allowed to react wit…
What is the maximum amount of iron(II) oxide that can be formed? 24.9 grams What is the FORMULA for the limiting reagent? $Fe$ What amount of the excess reagent remains after the …
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3. a sample of chlorine gas kept in a 1.8 l container at 32.0 °c exerts…
$0.29$
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part 1 collect and organize you have been given a lewis structure with …
The formal charge on C is + 1, on one S is 0, and on the other S is - 1.
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for the following reaction, 0.339 moles of butane (c₄h₁₀) are mixed wit…
Limiting reagent: $O_2$ Amount = $0.182$ moles
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18 question (1 point) complete the fischer projection that matches the …
# Explanation: ## Step1: Understand Fischer projection rules In Fischer projection, horizontal lines represent groups coming out of the plane (wedges in dash - wedge), and vertica…
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use the references to access important values if needed for this questi…
The formula for the limiting reactant: $N_2$ The maximum amount of nitrogen monoxide that can be produced: 0.486 mol
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use the following information to answer the next question. 1) o₂(g) at …
3421
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a chemistry student must write down in her lab notebook the concentrati…
$5.86\times 10^{-2}\ g/mL$
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1. a compound contains c, h, and o. the percentages of h and c are 6.73…
A. $C_2H_4O_2$
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17 question (1 point) in the structure below, click on each of the chir…
The carbon atoms with the chlorine, the carbon with the bromine - containing side - chain, and the carbon attached to the cyclobutane ring are the chiral centers.
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a student has 480.0 ml of a 0.1374 m aqueous solution of mnso₄ to use i…
$MnSO_{4}\cdot2H_{2}O$
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1. the volume of 2.50 mol of nh₃(g) at stp is ____________. (record you…
56.0
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part 2 (1 point) add any nonzero formal charges to the atoms as applica…
Add a negative 1 formal charge to the terminal sulfur atom.
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a student has 460.0 ml of a 0.1239 m aqueous solution of mgi₂ to use in…
$MgI_{2}\cdot8H_{2}O$
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a chemical engineer must report the average volume of a certain polluta…
5.7
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16. according to the kinetic - theory of gases which of the following s…
Ideal gas molecules have finite mass but zero volume.
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16 question (3 points) each chiral center in a molecule can have either…
4
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2nd attempt part 1 (1 point) add any nonzero formal charges to the atom…
Carbon has a formal charge of + 2, and the terminal sulfur has a formal charge of - 1.
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use the following information to answer the next two questions 13. the …
13. 1:1 14. Molecules with the same average kinetic energy
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1st attempt part 1 (1 point) a negative sign (-) is required for negati…
Part 1: + 4 Part 2: 0 Part 3: - 1
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10. relative to one liter of nitrogen at satp, one liter of carbon diox…
The same number of moles.
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b. the molar mass of 0.250 g of gas that occupies 100 ml at a pressure …
38.3 g/mol (corresponding to the last option)
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7. estimate the volume occupied by 23.9 mol of nitrogen at satp conditi…
592L
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5. determine the volume of carbon dioxide produced by the combustion of…
375 mL
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2. a gas in a sealed, rigid steel container is heated from a temperatur…
The amount of the gas.
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multiple choice question which best describes what happens to water whe…
its hydrogen bonds force molecules into a lattice structure
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multiple choice question which best describes how water helps to regula…
its hydrogen bonds counteract the increased movement of molecules
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part 4 (1 point) which of the following is the most likely lewis struct…
D. S=C=S; formal charges are minimized
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part 3 (1 point) see hint add any nonzero formal charges to the atoms a…
No non - zero formal charges need to be added.
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26. graph create a graph that illustrates the law of multiple proportio…
A graph with x - axis as mass of one element, y - axis as mass of the other element, and data points representing different compounds formed by the two elements, showing whole - n…
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part 2 (1 point) add any nonzero formal charges to the atoms as applica…
No non - zero formal charges to add.
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what is the element symbol of the atom you created? (1 point) o c si b
No information to determine a single - correct option among O, C, Si, B.
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10. what is the difference between low pressure and high pressure? * 4 …
In low pressure, warm air rises making "Lousy" weather; in high pressure, cold air sinks making "Happy" weather.
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part 1 (1 point) add any nonzero formal charges to the atoms as applica…
No non - zero formal charges need to be added.
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9. why is air pressure greatest at the surface of the earth? * 4 points…
because there's more of the atmosphere above you to push down on you
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11. use the simulation link to answer #11 - 15: https://phet.colorado.e…
B. Carbon
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25. calculate the mass percent of each element in water.
The mass percent of hydrogen in water is approximately $11.1\%$ and the mass percent of oxygen in water is approximately $88.9\%$.
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question 8 of 15 which of the following properties of water molecules i…
A. Water molecules contain polar covalent bonds, which affect the polarity of the molecules and increase their ability to dissolve other molecules.
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part 2 (1 point) o3 has two resonance forms that obey the octet rule. t…
For $O - O = O$: The left - most O has 3 lone pairs and a formal charge of - 1, the middle O has 1 lone pair and a formal charge of + 1, and the right - most O has 2 lone pairs an…
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part 1 (1 point) using the electron - density scale in which blue indic…
a; the central O is electron - poor
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24. complete the table. then analyze the data to determine if compounds…
| Compound | Total Mass (g) | Mass Fe (g) | Mass O (g) | Mass Percent Fe | Mass Percent O | | ---- | ---- | ---- | ---- | ---- | ---- | | I | 75.00 | 52.46 | 22.54 | 69.95% | 30.0…
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23. state the type of compounds that are compared in the law of multipl…
Binary compounds
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6. write a function to describe the number of oxygen atoms in terms of …
6. $y = 2x$ 7. Graph the points $(0,0)$, $(1,2)$, $(2,4)$ etc. and draw a straight - line. 8. 12 9. 125.39 g/mol
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7. graph the function on the grid below. 8. if you have six molecules o…
8. 12 9. Variable definitions: Atomic mass of $Zn\approx65.38$ g/mol, atomic mass of $C\approx12.01$ g/mol, atomic mass of $O\approx16.00$ g/mol. Equation: $M = atomic\ mass\ of\ …
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3 elements and compounds (continued) 22. explain how the law of definit…
A compound always contains the same elements in the same proportions by mass due to the fixed whole - number ratios in which atoms combine to form its molecules.
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4. how many carbon dioxide molecules would you have if you had a total …
For carbon - dioxide: 3 molecules, total atomic mass is 132 g. For penicillin: 2.25 molecules (assuming 16 H atoms per molecule), total atomic mass depends on the actual molar mas…
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question select the correct answer from each drop - down menu. complete…
The reaction when a compound breaks down: Decomposition The reaction when two substances combine to form one product: Synthesis The reaction involving replacement of atoms: Replac…
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which of these is an example of a physical change? - a banana ripening …
Liquid water turning into vapor
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dr. kelvin makes three chemical mixtures in his lab. he records the tem…
Mixture B
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powers: the scientific method: what is science? how do i ... the scient…
the solids put into the water
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*75. make the following conversions: a. 0.44 ml/min to microliters per …
a. Approximately 7.33 μL/s b. 78.6 mg/mm² c. 1.54 g/cm³
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a chemical compound in your toothpaste helps protect your teeth from de…
The elements in the compound $\text{Na}_{2}\text{PO}_{3}\text{F}$ are sodium (Na), phosphorus (P), oxygen (O), and fluorine (F).
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identify the positive and negative regions of these two molecules to sh…
Positive regions are areas with partial positive charge (e.g., near less - electronegative atoms in a polar bond). Negative regions are areas with partial negative charge (e.g., n…
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70. three balloons filled with neon, carbon dioxide, and hydrogen are r…
The neon - filled balloon will rise. The carbon - dioxide - filled balloon will sink. The hydrogen - filled balloon will rise rapidly.
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identify four unique characteristics of compounds.
1. Definite composition (fixed ratio of elements). 2. Unique chemical properties (different from constituent elements). 3. Fixed melting and boiling points. 4. Can only be separat…
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*69. a shiny, gold - colored bar of metal weighing 57.3 g has a volume …
No, the bar of metal is not pure gold.
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compare and contrast the characteristics of carbon - 14 by completing t…
1. Carbon - 14 is radioactive because it has an unstable nucleus that decays over time. 2. Knowing the half - life of carbon - 14 enables scientists to perform radiocarbon dating …
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complete the paragraph below using the terms listed to the left. a subs…
1. element 2. isotope 3. compound 4. covalent bond 5. ion 6. ionic bond 7. van der Waals force 8. ionic bond
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vocabulary compare the terms in the table by defining them. atom electr…
Atom: The basic unit of matter. Nucleus: The central part of an atom containing protons and neutrons. Proton: A positively - charged particle in the nucleus. Neutron: A neutral pa…
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3.1 using and expressing measurements 56. three students made multiple …
Colin: Low accuracy, low precision. Lamont: Moderate accuracy, high precision. Kivrin: Low accuracy, high precision.
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draw a potential energy diagram for an bond that has a longer bond leng…
Sketch a potential - energy curve with the minimum at a distance greater than 74 pm and with a lower bond - energy value (smaller energy difference between minimum and separated a…
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when there is more than one possible lewis structure, _______ helps you…
formal charge
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give the complete electron configuration for the yttrium ion in problem…
1. F. 36 2. O. $4s^{2}$ 3. M. $3d^{10}$ 4. P. $4p^{6}$ 5. R. $5s^{0}$ 6. S. $4d^{0}$
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what does yttrium do to become stable? y will __1__ and have a __2__ ch…
1. B. lose 3 electrons 2. H. +3
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give the complete electron configuration for yttrium. do not use the no…
1. H. 39 2. O. $4s^2$ 3. M. $3d^{10}$ 4. P. $4p^6$ 5. Q. $5s^2$ 6. N. $4d^1$
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the greater the difference in electronegativity, the the longer the bon…
greater the ionic character
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give the complete electron configuration for the sulfur ion in problem …
1. E. 18 2. L. $3s^{2}$ 3. J. $3p^{6}$
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what does sulfur do to become stable? s will __1__ and have a __2__ cha…
1. C. gain 2 electrons 2. I. - 2
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89. how many molecules are in each sample? a. 6.5 g h₂o b. 389 g cbr₄ c…
a. Approximately $2.17\times 10^{23}$ molecules b. Approximately $7.04\times 10^{23}$ molecules c. Approximately $4.16\times 10^{23}$ molecules d. Approximately $1.10\times 10^{23…
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give the complete electron configuration for sulfur. do not use the nob…
1. D. 16 2. L. 3s² 3. K. 3p⁴
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note that a probability map is not the same as a balloon model __1__ is…
1. (b) 2. (a)
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use the theoretical maximums to answer the following: how many electron…
1. D. 10 2. F. 14
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use the theoretical maximums to answer the following: how many subshell…
1. C. 4 2. B. 5
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23/46 the dotted lines in this structure represent select all correct o…
a hybrid bond that is halfway between a double and single bond, equivalent resonance structures, delocalised electrons
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use the theoretical maximums to answer the following: how many electron…
1. E. 32 2. A. 50
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17/46 which elements do not get octets when covalently bonding? select …
A. B, B. H
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to draw a lewis dot model you have to know. select all correct options.…
C. the number of valence electrons an atom has, D. the group an element is in
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incorrect answer, you get one more chance 12/46 a lewis structure shows…
B. the bonding between atoms in a molecule
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equal amounts of methylene blue (319.85 g/mol) and potassium permangana…
Potassium permanganate had a lower molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time.
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which will exist as individual molecules? select all correct options na…
B. F₂, C. CO₂
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when temperature increases, the random movement of molecules increases …
substance #5 in a gas at 78°F
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reasons that diffusion of a chemical is fastest in air than water. diff…
- the chemical would have to collide with and push through fewer molecules as it spreads out. - air molecules travel faster than water molecules. - air is less dense than water.
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to draw a lewis dot model you have to know. select all correct options.…
B. the number of valence electrons an atom has, C. the group an element is in