Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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while looking at calcium (ca) on the periodic table, a student needs to…
directly to the right
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the element phosphorus is located to the right of the element magnesium…
Phosphorus has a larger atomic mass.
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chlorine is a respiratory irritant that can burn skin in liquid form an…
Gaseous chlorine—mucous membrane irritation
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mercury is widely used in labs for thermometers, barometers, and pumps.…
C. Caustic soda and chlorine
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6 the density of hydrogen is 0.0763 grams per cubic centimeter. how is …
C. $7.63\times10^{-2}$
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chlorine is vital for safe drinking water and widely used in paper, tex…
A. Sodium
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locate the element platinum (pt) on the periodic table and click on the…
Melting point: 1768.3 Boiling point: 3825
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liquid octane reacts with oxygen gas to form carbon dioxide gas and wat…
$2C_8H_{18}(l)+25O_2(g) ightarrow16CO_2(g) + 18H_2O(g)$
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4. directions select the correct answer periods are horizontal rows of …
Li
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read the excerpt from a modest proposal. a very worthy person, a true l…
Swift uses irony when he says the person with whom he discussed his plan is "very worthy" and "a true lover of this country."
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4. directions select the correct answer. periods are horizontal rows of…
Li
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locate the element helium (he) on the periodic table. what is the perio…
1
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3. which of the statements below accurately describes the trends of ele…
Electronegativity increases from left to right across a period and from bottom to top in a group. So the correct statements are: Electronegativity increases from left to right acr…
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identifying the properties of zinc locate the element zinc (zn) on the …
Number of protons: 30 Number of electrons: 30 Number of neutrons: 35
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2. which of the following elements has the largest atomic radius? calci…
Potassium
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visit the interactive periodic table and locate the element neon (ne). …
10 20.2
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1. which element has the largest atomic radius?
B.
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aqueous hydrogen chloride reacts with oxygen gas to form chlorine gas a…
$4HCl(aq)+O_2(g) ightarrow 2Cl_2(g)+2H_2O(l)$
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section 2 september 16 - september 26 day 1 in your words, explain the …
- Day 1: The Law of Conservation of Matter means matter is conserved in chemical reactions; total mass of reactants = total mass of products. - Day 2: Coefficient. - Day 3: Subscr…
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a molecule of oxygen gas (o2) is __________. * nonpolar covalent bond p…
1. nonpolar covalent bond 2. alkali metal
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what kind of charge does an ionic compound carry?* neutral positive neg…
1. neutral 2. polar covalent bond
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what is the relative mass (amu) of an electron?* your answer what is th…
Relative mass: 0.00054858 amu Charge: - 1 (relative) or - 1.602×10⁻¹⁹ C Symbol: $e^-$ Location: Electron - cloud outside the nucleus
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instructions: balance the chemical equations below. 1) ___ n₂ + ___ o₂ …
1) $2N_2+O_2 = 2N_2O$ 2) $Zn + 2HCl=ZnCl_2 + H_2$ 3) $4Fe + 3O_2 = 2Fe_2O_3$ 4) $2Al+3FeO = Al_2O_3 + 3Fe$ 5) $P_4+5O_2 = 2P_2O_5$ 6) $C_3H_8+5O_2 = 3CO_2 + 4H_2O$ 7) $MgF_2+Li_2C…
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balancing equations - questions instructions: balance the chemical equa…
#1: 2HgO → 2Hg + O₂; Hg: 2, 2; O: 2, 2 #2: P₄ + 3O₂ → 2P₂O₃; P: 4, 4; O: 6, 6 #3: 3BaS + 2Li₃N → Ba₃N₂ + 3Li₂S; Ba: 3, 3; S: 3, 3; Li: 6, 6; N: 2, 2 #4: 2NaF + Br₂ → 2NaBr + F₂; N…
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3. complete the following table. you do not need to fill in the darkene…
| Isotope Format | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | Charge | Atom or Ion? | |---|---|---|---|---|---|---|---| | - | 6 | 14 | 6 | 8 | 6 | 0 | Ato…
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the law of conservations of mass tells us that the total amount of matt…
1. $2\mathrm{H}_{2}+\mathrm{O}_{2}\to2\mathrm{H}_{2}\mathrm{O}$ 2. $\mathrm{P}_{4}+3\mathrm{O}_{2}\to2\mathrm{P}_{2}\mathrm{O}_{3}$
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answer the following questions based on the information for each type o…
What is the charge of a proton? Positive (+1 elementary charge) What is the symbol for a proton? $p$ or $p^+$ What is the relative mass (amu) of a proton? 1 amu
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reviewing contributions to the periodic table match each scientist with…
Johann Wolfgang Dobereiner - created groups of three elements, each based on similar properties John Newlands - arranged elements according to their atomic mass Dmitri Mendeleev -…
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# question answer 1 answer 2 answer 3 answer 4 14 mixtures that are uni…
14. Answer 4. Homogeneous Dark Green 15. Answer 3. Matter Dark Brown 16. Answer 1. Element Gray 17. Answer 3. Extensive Orange 18. Answer 2. Solid Yellow 19. Answer 1. Intensive L…
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adapted from what the schools teach and might teach by john franklin bo…
In 1915, schools were placing emphasis on science instruction.
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students are completing a table about a particular subatomic particle t…
with “Outside of the nucleus,” because the particle is an electron
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name: bianca date: matter and change hidden picture questions direction…
1. Answer 2: Physical change Orange 2. Answer 4: Properties Gray 3. Answer 1: Volume Black 4. Answer 2: Boiling point Orange 5. Answer 4: Plasma Gray 6. Answer 3: Heterogeneous Da…
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which statement best explains why the overall charge on an atom is zero…
The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.
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after agreeing with your suggestion to try out notion for tracking her …
C. Rewards that unlock music tutorials after learning sessions
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roberto creates an animation titled \flying through an atom.\ the anima…
The viewer travels through the electron cloud, then the nucleus, and then the electron cloud again.
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what value is closest to the mass of the atom? 4 amu 6 amu 10 amu 14 amu
10 amu
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help her achieve her goals. like you, chloe is juggling her time betwee…
B. Google Calendar
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3. using the periodic table as a model, which prediction about element …
Element W will have 7 valence electrons and tend to form $W^-$ ions.
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15. a chemistry student examines data for three different atoms of oxyg…
They are the same element but different isotopes because they have different numbers of neutrons.
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14. element z is in group 15, period 6. using periodic trends, which pr…
Element Z will have the same number of valence electrons as nitrogen and be more metallic.
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13. a chemistry teacher provides students with this partial periodic ta…
R will be a nonmetal with 7 valence electrons, forming R⁻ ions, and be very reactive.
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12. which models would best show the difference between a neutral sodiu…
The neutral atom model would have 11 protons and 11 electrons; the sodium - ion model would have 11 protons and 10 electrons.
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11. a student creates models of four different particles and records th…
W, X, and Y are all related to the same element; Z represents a completely different element.
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what happens to ocean water molecules when they become colder? they mov…
They pack together more tightly
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a student analyzes data showing the number of valence electrons for ele…
The number of valence electrons increases from 1 to 8 as atoms become more non - metallic.
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9. an atom has an atomic number of 17 and a mass number of 35. if this …
The ion has 17 protons, 18 neutrons, and 18 electrons with a total mass of 35 amu.
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why do dark - colored objects absorb radiant energy faster than light -…
D. Dark surfaces have more energy - absorbing electrons
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2. a student uses the periodic table to predict properties of an elemen…
All four predictions, because they follow established periodic trends.
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the total number of electrons that can be found in an s orbital is a. 2…
A. 2
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7. the table shows data for four elements in the same period: element v…
Element B, because it has properties between metals and nonmetals in this period
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the element that corresponds to the electron configuration 1s²2s²2p⁶ is…
D. neon
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the electrons available to be lost, gained, or shared when atoms form m…
C. valence electrons
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6. a scientist discovers three particles with the following properties:…
A. X and Y are isotopes; Z is an ion of the same element as X and Y
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in a covalent bond, electrons are __________. * o shared o lost o gaine…
1. A. shared 2. C. sodium chloride 3. B. sodium
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in which set of elements would all members be expected to have very sim…
B. O, S, Se
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5. a student plots the ionic charges of main - group elements versus th…
Elements form ions to achieve the electron configuration of the nearest noble gas.
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if the spin of one electron in an orbital is clockwise, what is the spi…
B. counterclockwise
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4. a student needs to predict the properties of element y, which is loc…
Y will be a nonmetal, solid at room temperature, with 6 valence electrons, forming $Y^{2 - }$ ions.
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an element is made up of only one kind of atom. * 2 points true false t…
1. True 2. False 3. True
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3. using the periodic table as a model, which prediction about element …
None of the provided options are correct for a Group 12 element. If considering Group 17 elements, the correct statement would be that an element in Group 17 will have 7 valence e…
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the group of active metals that have one electron in an s orbital are k…
D. alkali metals
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how does water velocity affect chemical weathering? it has no effect on…
It accelerates the transport of dissolved minerals
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of the choices below, which one gives the order of highest to lowest io…
C. Ar, O, S, Si, Al
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2. a research team collects data on the properties of elements in perio…
Metallic character decreases across the period, with metalloids showing intermediate properties.
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1. a student analyzes data showing the physical states of elements in p…
Elements on the left side are solids, while elements on the right side can be gases.
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atoms consist of a positively charged center called a(n) __________. * …
1. D. nucleus 2. B. electrons
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which process describes the action of wind - blown particles causing ro…
A. Aeolian weathering
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which of the following are characteristics of ancient greek architectur…
beauty, harmony, and proportion
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match the vocabulary word to its definition. nucleus proton electron cl…
- nucleus: the central part of the atom containing protons and neutrons - proton: a positively charged particle located in the nucleus of an atom - electron cloud: the area of the…
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which factor most significantly affects frost wedging? chemical composi…
Freeze - thaw cycles
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how much does a chemical reaction rate typically increase for every 10°…
C. It doubles
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bohr model worksheet for each element draw the inner electrons blue & t…
- Sodium (Na): Inner electrons (blue): 2 in first shell, 8 in second shell; Valence electron (red): 1 in third shell. - Aluminum (Al): Inner electrons (blue): 2 in first shell, 8 …
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match each word to its definition. energy stored in a molecule a. chemi…
energy stored in a molecule - a. chemical energy a force that exists between any two objects that have mass - b. gravity the amount of energy that is stored in an object - d. pote…
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complete the table; the first two rows have been done for you. use your…
| Element | Symbol | Protons | Neutrons | Electrons | |---|---|---|---|---| | Sodium | Na | 11 | 12 | 11 | | Aluminum | Al | 13 | 14 | 13 | | Lead | Pb | 82 | 125 | 82 | | Titaniu…
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identify the names of the two fossils? select the names of the two uniq…
No answer can be provided without more information (such as the snapshots) to make a proper selection.
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directions: construct a well - organized argumentative piece that incor…
A well - organized argumentative piece should start with an introduction stating the research question and the stance that the destination is more important when planning a vacati…
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multiple choice 1 point how many electrons does one neutrally - charged…
18
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exam 01 - (fall 2025) 38. a schedule of reinforcement that is construct…
38. a. A ratio schedule 39. c. Observational learning 40. a. Latent learning 41. b. Encoding, storage, and retrieval 42. c. Chunking 43. b. Procedural 44. b. Short - term
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according to georgias implied consent law, what happens if a driver ref…
C. The driver's license will be suspended for 1 year, regardless of age
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the diagram below represents the nucleus of an atom. key: ● = proton ○ …
We need to count the protons and neutrons from the diagram. If we assume there are 9 protons and 10 neutrons: The atomic number is 9 (number of protons) and the mass number is 9 +…
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15 multiple choice 1 point which of the following indicates a chemical …
D. Rusting iron
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aim: date: the block diagram below shows a cross - section of a landsca…
6. C. C, D, and E 7. B. Some rock layers were more resistant to weathering and erosion. 8. B. limestone 9. The total surface area increases. The chemical composition of the rock r…
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12 multiple choice 1 point which of the following is a chemical propert…
12. Reactivity with oxygen 13. Change in color
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9 multiple choice 1 point the nucleus of most atoms is composed of- loo…
9. tightly packed protons and neutrons 10. intensive
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aim: how does climate affect landscape development? humid climate - amo…
1. Location D; because it has a relatively high - temperature range and the highest annual precipitation among the four locations, which are favorable for chemical weathering. 2. …
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aim: date: 5. landscapes will undergo the most chemical weathering if t…
5. D. warm and wet 6. D. warm and humid For single cube: Area of one side: \(1\) \(cm^2\) How many sides: 6 How many cubes: 1 Total Surface Area: \(6\) \(cm^2\) Rate of Weathering…
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determine if the following is an intensive property or an extensive pro…
1. intensive 2. neutrons 3. 13
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26 multiple choice 1 point how many neutrons are in $_{16}^{32}s^{2 - }…
26. D. 16 27. A. intensive
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what does georgias implied consent law mandate regarding chemical testi…
B. Drivers are only required to submit to breathalyzer tests if requested by law enforcement.
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example 2 element x has two naturally - occurring isotopes. the isotope…
a. 49.31% b. 79.99 amu
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9. the periodic table does not show the atomic mass of every isotope fo…
9a. There are a large number of isotopes for many elements. Listing the atomic mass of every isotope would make the periodic table extremely cluttered and difficult to read and us…
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average atomic mass 5. based on model 1 and the table you created in qu…
6a. $^{24}$Mg: 16 atoms, $^{25}$Mg: 2 atoms, $^{26}$Mg: 2 atoms 6b. Model 1 may not be accurate as it may not reflect natural - abundance ratios precisely. 7. 23.9850 amu because …
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checkpoint: the demonstration shown in the diagram below indicates that…
1. C. more total surface area 2. D. increase due to an increase in surface area 3. D 4. B. surface area has been increased
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critical thinking questions 5. neon has three different isotopes. 90.51…
$20.18\ amu$ ### 6.
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look at each answer choice. decide whether it is an example of a chemic…
Chemical Change: Lighting a match, After pouring baking soda into vinegar it begins to fizz, An iron nail slowly rusts and turns reddish - brown Physical Change: Putting two cubes…
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the data table provides the chemical formulas of four unknown substance…
C. substance 3
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1. which type of weathering is most common where the average yearly tem…
1. Moderate chemical weathering with frost action 2. Strong chemical weathering 3. increases; increases
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32) calculate the number of moles in 160.0 grams of calcium carbonate (…
E. 1.598 mol
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32) calculate the number of moles in 150.0 grams of calcium carbonate (…
A. 0.5622 lb
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in the equation 2h₂ + 1o₂ →→ 2h₂o. if you change the 2h₂ to 3h₂ molecul…
It is not possible to produce water without leftover molecules.