Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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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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which statement best describes the rhyme scheme in \a psalm of life\? t…
The poem adheres to strict ABAB rhyme scheme, with the exception of the final stanza.
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which of these is an example of a chemical change? feeling ice melt on …
leaving cheese out to get moldy
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which of these is an example of a chemical change? burning gasoline den…
burning gasoline
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which option is an example of a physical change? gasoline burning silve…
D. metal denting
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what does the release or absorption of energy indicate? chemical change…
chemical change
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which property is a chemical property of a substance? ○ melting point ○…
C. reactivity
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what is the rhyme scheme of \a psalm of life\? abba aabb abbc abab
D. ABAB
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identifying parts of an atom identify the parts of the atom that are la…
Label A: Nucleus Label B: Electron
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which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
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the atomic models after daltons time included ideas about the atomic st…
Schrödinger’s model
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according to the law of conservation of matter, matter is neither chang…
A. changed, destroyed
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what new characteristic did john dalton add to the model of the atom? a…
An atom can join with other kinds of atoms.
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the nucleus of an atom has a(n) electric charge. a positive b neutral c…
A. positive
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question 8 (1 point) which of these shows a structural model of a compl…
B.
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5 which element did mendeleev predict before it was discovered? a neptu…
B. Gallium
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1 who was the scientist credited with the development of the periodic t…
C. Dmitri Mendeleev
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a group of students are wandering around a room. when their teacher cla…
an amorphous solid because the particles do not have a regular structure
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the repeating subunits that are responsible for the shape of a crystal …
unit cells.
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what happens when the kinetic energy of molecules increases so much tha…
Matter changes to a plasma state.
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what happens when a solid is dissolved into a liquid? solid particles f…
Solid particles become evenly dispersed among liquid particles.
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carla makes a small cardboard boat and floats it in a tub of water. whe…
The soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
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the particles in water have less mobility than the particles in oxygen.…
Water particles have strong intermolecular forces.
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glycerol boils at a higher temperature than water. what does this indic…
They are stronger than those in water.
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liquids and solids are referred to as condensed phases because the attr…
leave little space between the molecules.
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which process most likely takes place when the kinetic energy of molecu…
A. boiling
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melting can be best described as a process in which molecules lose kine…
gain enough kinetic energy to get past each other.
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which term best describes the substances that cause oil and water molec…
A. surfactants
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george is studying compounds that are found in living things. he makes …
Many compounds can be made by different combinations of the same elements
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the model shows a hydrolysis reaction. complete the sentence. during a …
During a hydrolysis reaction, disaccharides are broken down into monosaccharides to release energy.
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select the polysaccharide.
The middle structure (the one with multiple monosaccharide units linked together)
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compare the chemical structure of maltose to lactose and sucrose. compl…
Maltose is a disaccharide made of two glucose. Compared to lactose and sucrose, maltose has the same number of carbon, hydrogen, and oxygen atoms.
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galactose. compare glucose, fructose, and galactose. glucose fructose g…
| | glucose | fructose | galactose | |--|--|--|--| | has 12 hydrogen and 6 oxygen atoms | √ | √ | √ | | is a monosaccharide | √ | √ | √ | | has a 6 - atom ring | √ | × | √ |
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carbohydrates are also known as saccharides. the word saccharide is a t…
$C_6H_{12}O_6$
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10 multiple choice 1 point high - speed videos of lightning show that s…
10. Electric fields in the atmosphere guide charges in stages, causing electrons to move along regions where the field is strongest. 11. Oxygen has 6 valence electrons and gains 2…
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6 multiple choice 1 point coulombs law describes the force between char…
It quadruples ### 7.
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question 4 consider a random nitrile rubber poly(acrylonitrile - butadi…
53340
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4 multiple choice 1 point which of the following best explains why nitr…
4. The energy from lightning excites atoms enough to transfer or remove electrons. 5. Oxygen (O)
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1 multiple choice 1 point which best describes lightning from a chemist…
1. A large movement of electrons creating an electric discharge 2. Heat and water vapor increase particle movement, creating more charge separation 3. How do atoms and charges in …
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this is the continuation of the previous question. calculate the number…
1000
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question 4 consider a random nitrile rubber poly(acrylonitrile - butadi…
53.34 g/mol
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21) how much energy is released during the formation of 98.7 g of fe ac…
A. 753 kJ
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reactants are the substances going into a chemical reaction. products a…
B. An element
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what does cleaning water before we use it and after we use it require? …
chemicals and energy
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which of the following schematics is consistent with a polymer architec…
(d)
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match each two - dimensional structure to its correct three - dimension…
- Linear: $Y - X - Y$, $Y=X = Y$ - Trigonal planar: $Y - X - Y$ (with a lone - pair on $X$) - Bent: $Y - \ddot{X}-Y$, $Y - \ddot{X}=Y$ - Tetrahedral: $Y - X - Y$ (with 4 bonding p…
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which of the following schematics is consistent with a polymer architec…
A. The structure in option (a) shows a main chain with two distinct block - like regions (different colored circles in sequence) and side - chains attached to the main chain, whic…
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match each two - dimensional structure to its correct three - dimension…
1. For \(Y - X - Y\) with no lone - pairs on \(X\): Linear 2. For \(Y=X = Y\): Linear 3. For \(Y - \ddot{X}-Y\) with two lone - pairs on \(X\): Bent 4. For \(Y - \ddot{X}-Y\) with…
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after dinner, hector demonstrated to his parents a process that he lear…
C. How two pure substances can be combined to form a solution
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is this a run - on sentence? two hydrogen atoms and one oxygen atom com…
no
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6. what is the name of the subatomic particle that changes when we have…
6. Neutron 7. Mass number = number of protons+number of neutrons 8. Carbon - 14 or $^{14}C$ 9. Zirconium 10. 80 11. 40 12. 40
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c. the sum of the superscripts should equal the total number of electro…
1. $1s^22s^22p^63s^1$ 2. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^2$ 3. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2$ 4. $1s^22s^22p^63s^23p^64s^23d^{10…
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which term means \stopping bleeding\? hemoglobin hemostasis thrombosis …
B. hemostasis
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what are chemical sedimentary rocks formed from? chemicals dissolved in…
chemicals dissolved in water
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2. refer to the 3 stable isotopes of argon above. as the mass number of…
2. C. remains the same 3. A. a positive charge 4. B. moving in circles 5. C. (the diagram with 2 electrons in the first shell, 8 in the second shell and 7 in the third shell)