Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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romeo: to juliet. if i profane with my unworthiest hand this holy shrin…
Romeo's lines make up one quatrain, which uses an abab rhyme scheme.
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read the sentence from an argumentative essay about chemical waste. the…
B. The chemical waste produced by factories is dangerous, and factory owners should be held accountable.
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read the excerpt from the environmental ethic. it is fashionable in som…
A. All species are worth protecting because even the small organisms contribute important functions in the environment.
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lewis dot structure directions: fill in the lewis dot structure for eac…
| Problem | What is Wrong | Correct Version | | ---- | ---- | ---- | | :N: with 8 dots | Incorrect number of valence electrons (should be 5) | :N··· | | :Xe: with incorrect dot - …
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relating this information back to the flame test and light emission lab…
1. The heat from the flame. 2. We see an overall color. 3. Because each atom has a unique set of energy levels for its electrons.
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1. when water dissolves something, it creates... a. an ion; b. a nonpol…
A. an ion
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electron configuration practice name: for the elements draw the orbital…
Magnesium: $1s^{2}2s^{2}2p^{6}3s^{2}$ Calcium: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ Phosphorus: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ Copper: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s…
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classify the following as an element (a), compound (b), homogeneous mix…
45. B. Compound 46. A. Element 47. D. Heterogeneous mixture 48. B. Compound
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if one atom of fe+3 and three atoms of cl- ionically bond together what…
0
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31. what is the independent variable in the graph? a. solubility of sug…
C. Temperature
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if opposites attract and iron (fe +3) has a positive 3 charge (wants to…
Fe+3 attracts 3 Cl- atoms to become 1 atom of Fe ionically bonded to 3 atoms of Cl.
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so if opposite charges attract, how many sodium ions (na +) do you thin…
B. 2
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so we learned why group 1 atoms/elements have a positive +1 charge. why…
They must lose 2 electrons therefore making them +2
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how many valence electrons do group 2 metals have? *
2
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which element from group 17 will form an ion with the electron configur…
1. B. Chlorine (Cl) 2. C. Sulfur with 6 dots gaining 2 dots, enclosed in brackets with a 2 - charge.
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look at the two forms of copper. one copper ion can have a charge of +1…
copper (I), copper (II)
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57. consider two separate gas containers at the following conditions: c…
$P_B = 2P_A$
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was pinned to her shirt indicated she was a biochemist, here, i guessed…
H. it was
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review the details below. marie curie was the first person to receive t…
Scientist Marie Curie achieved several important milestones during her career.
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some types of head protection: hard hat or safety helmet offers protect…
After the expiry of its maximum service life. If the hard hat is deformed by a fallen object.
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19. calcium chloride has a density of 2.50 g/cm³. if you have 218 g of …
A. $87.2\ cm^{3}$
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head protection is mandatory. some types of head protection: hard hat o…
Climate, The material, Direct sunlight, Chemicals
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head protection protects the head against falling objects or impact. in…
Climate, The material, Direct sunlight
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some types of head protection: hard hat or safety helmet offers protect…
In places where you can bump your head. In places where you can get hit by falling objects. On seeing the appropriate mandatory sign.
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16. which of the following is not a sign that a chemical reaction may h…
B. Changing state from liquid to gas
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47. complete the following table for an ideal gas. p (atm) v (l) n (mol…
1. Recall the ideal - gas law: - The ideal - gas law is given by \(PV = nRT\), where \(P\) is the pressure in atmospheres (atm), \(V\) is the volume in liters (L), \(n\) is the nu…
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currently, new regulations control the use of pesticides and chemical f…
Water contamination
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is located in period 1. lithium (li) magnesium (mg) helium (he)
Helium (He)
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion
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which event is most likely occurring? o diffusion because particles mov…
diffusion because particles move from regions of high concentration to regions of low concentration
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complete the statements describing periods 1 and 2 on the periodic tabl…
- is located in period 1: Hydrogen (or H) - This period contains a total of: 2 - The valence electrons for these elements are located in the: first - is located in period 2: Lithi…
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why do atoms exchange or share electrons during bonding? (1 point) to h…
to obtain a full outer electron shell
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what are valence electrons? (1 point) o electrons that are exchanged be…
the electrons in an atom's outermost energy level
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which statement describes effusion? it occurs when a gas passes through…
It occurs when a gas passes through a tiny hole.
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which feature defines a neutral atom? (1 point) a full outer electron s…
the number of electrons equal to the number of protons
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which observation indicates that the kinetic - molecular theory has lim…
Increasing collisions of gas molecules will increase energy between them.
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the closeness of particles of gas and their low speeds allow intermolec…
This is a limitation of the kinetic - molecular theory.
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how can atoms that do not have a full shell become stable? * atoms \wan…
By gaining electrons to fill a shell or losing electrons to get rid of a shell exposing a full one underneath.
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complete the table to describe the properties of each set of elements. …
| Elements | Metals or non - metals? | Reactive or unreactive? | | ---- | ---- | ---- | | Br, Cl, F | Non - metals | Reactive | | K, Rb, Na | Metals | Reactive | | Ar, Kr, Xe | No…
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noble gases do not react with other elements because their valence shel…
full
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yes or no, are atoms stable if they do not have a full shell? * atoms \…
No
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which of the following molecules shows two atoms of hydrogen (h)? (1 po…
$H_2SO_4$
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what does the law of conservation of mass say about a chemical reaction…
In a chemical reaction, mass is neither created nor destroyed
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what are the reactants in a chemical formula? (1 point) ○ the atoms lef…
the atoms prior to the chemical reaction, found on the left side of the equation
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this is a form of ground water pollution where heavier chemicals fall b…
B. Deposition
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11. you are given a container filled with clumps of iron and sand. you …
C. heterogeneous mixture
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11. you are given a container filled with clumps of iron and sand. you …
C. heterogeneous mixture
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while developing the periodic table, dmitri mendeleev left spaces for u…
Melting point: Low Flexibility: Brittle (not flexible) Electrical conductivity: Poor Chemical properties most similar to: Chlorine, Bromine
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again? lets start week 2 early! complete the statement by entering a nu…
5
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complete the statement by entering a num a neutral mg atom has valence …
2
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complete the statement by entering a number. a neutral cl atom has vale…
7
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complete the statement by entering a numbe a neutral cs atom has valenc…
1
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a neutral se atom has valence electron(s)
6
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complete the statement by entering a numbe a neutral si atom has valenc…
4
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complete the statement by entering a number. a neutral xe atom has vale…
8
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chemistry worksheet - wavelength, frequency, & energy of electromagneti…
1. $\lambda\approx7.98\times 10^{-7}\text{ m}$ 2. $ u\approx4.35\times 10^{20}\text{ Hz}$ 3. $\lambda\approx1.00\times 10^{8}\text{ m}$ 4. $\lambda\approx2.34\times 10^{-9}\text{ …
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8. in what family would each of these elements be classified? radium - …
8. Radium - Alkaline - earth metal Tin - Post - transition metal Iodine - Halogen Cesium - Alkali metal 9. Barium = 2 Lead = 4 Bismuth = 5 Potassium = 1
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periodic table basics 1. which elements had complete outer shells? give…
3. The number of valence electrons increases by 1 as you move from left to right across a period. 4. The number of energy levels or shells increases by 1 as you move down a group.…
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which of the following example demonstrates the reversibility of a chem…
recharging batteries
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which of the following happens during a chemical change but does not ha…
Atoms of one or more substances rearrange into a new substance
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which of the following is a reliable way to observe that a chemical cha…
conduct a test to determine the chemical makeup of the molecules
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2. which elements had only one valence electron? give the name and symb…
Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr); They are in group 1 of the periodic table.
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which of the following demonstrates a chemical change? (1 point) o iron…
iron (Fe) reacting to water((H₂O)) and oxygen(O) to form iron oxide(Fe₂O₃)
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which of the following is an example of only a physical change? (1 poin…
dry ice becoming vapor
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periodic table basics name 1. which elements had complete outer shells?…
These elements (argon - Ar, radon - Rn, neon - Ne) are all in Group 18 of the periodic table.
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periodic table basics 1. which elements had complete outer shells? give…
1. Noble Gases: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn). They are in Group 18. 2. Alkali Metals: Lithium (Li), Sodium (Na), Potassium (K), etc. Th…
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reminder: answer also the day that youre absent to receive full credit.…
1. **Natural sources of carbon**: Fossil fuels, decomposition of organic matter, volcanic eruptions. - **Human - sourced carbon**: Burning of fossil fuels, deforestation, industri…
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11 ozone is composed of ______ two hydrogen atoms and one oxygen atom t…
B. three oxygen atoms
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2. explain the difference between mass number and average atomic mass. …
2. Mass number is the sum of protons and neutrons in a single - isotope atom. Average atomic mass is the weighted - average mass of all naturally occurring isotopes of an element,…
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10 which of the following is a primary change seen in the mesosphere? t…
Temperatures decrease as the distance from Earth increases
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what does atmosphere mean in this story? a gases that surround a planet…
1. a. gases that surround a planet 2. a. The Northern Lights would be less bright. 3. Water is a universal solvent, participates in biochemical reactions, helps with temperature r…
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elements in the same group have similar properties. what element is in …
None of the given options are correct as silver's symbol is Ag not Au. If the option was silver (Ag), it would be the correct answer.
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which of the following elements has a max of 3 energy levels? c ca si
Si
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multiple - choice question beryllium is in the 2nd row. how many energy…
2
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the parts of the periodic table that goes up and down in columns are th…
B. groups
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true or false: chemists use the periodic table to make predictions abou…
True
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count the atoms! hio$_{3}$
5
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count the atoms! 3agclo₃
15
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count the atoms! ch₂choh
8
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what is the signifcance of the vertical columns on the periodic table? …
They have similar properties.
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count the atoms! lic₂h₅o
9
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multiple - choice question the modern periodic table is arranged in ord…
number of protons
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count the atoms! 2ga(oh)3
14
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count the atoms! 2c₃h₈o₂
26
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multiple - choice question how did moseley arrange the periodic table? …
B. atomic number
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count the atoms! ga(clo₄)₃
16
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count the atoms! lic₂h₅o
9
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mendeleev organized the chemical elements based on what two factors? sy…
atomic weight, properties
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b. properties of metals and important metal groups 3. list 5 properties…
1. Electrical conductivity 2. Thermal conductivity 3. Malleability 4. Ductility 5. Luster
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count the atoms! 2c₄h₆o₂
24
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count the atoms! ch₃coona
8
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part 2 (1 point) rank these three species in order of increasing formal…
$CN^-<CO_2<CH_3^+$
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1st attempt part 1 (1 point) what is the formal charge on the carbon at…
E. -1
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04 question (4 points) how many electron pairs are shared (i.e., how ma…
Part 1: 3 Part 2: 2 Part 3: 1 Part 4: 3
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part i: use the notation below to answer the following questions. pract…
1. Isotopes 2. Mass - numbers 3. Neutrons 4. \(^{12}C\): 6 protons, 6 neutrons, 6 electrons; \(^{13}C\): 6 protons, 7 neutrons, 6 electrons; \(^{14}C\): 6 protons, 8 neutrons, 6 e…
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8. what is the formula for calculating acceleration? 9. a student pushe…
8. $a=\frac{F}{m}$ 9. $0.5m/s^{2}$ 10. 8
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sample problem: problem 12.20 entropy - qualitatively for each of the f…
(a) $Cl_2$ because gases have higher entropy than liquids and even if both were gases, $Br_2$ has a larger molar mass but the gas - phase entropy contribution dominates. (b) $Pt$ …
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sort the following from lowest to highest absolute entropy at a given t…
$H_2O(s), H_2O(l), H_2(g), O_2(g), H_2O(g)$
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draw the orbital diagram for the magnesium ion (mg2+): write the electr…
Configuración electrónica: 1s²2s²2p⁶ Número de electrones no emparejados: 0 Diagrama de orbitales: 1s: (↑↓) 2s: (↑↓) 2p: (↑↓)(↑↓)(↑↓)
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draw the orbital diagram for the fluoride ion (f-): write the electron …
Orbital diagram: 1s: [↑↓] 2s: [↑↓] 2p: [↑↓] [↑↓] [↑↓] Configuración electrónica: 1s²2s²2p⁶ Número de electrones no - emparejados: 0