Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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23. what is the correct coefficient for $h_{2}o$ when balancing the equ…
A. 2
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21. how many oxygen atoms are present on the reactant side before balan…
D. 2
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15. what is an exothermic reaction? a. a reaction that does not involve…
d. A reaction that releases energy to its surroundings
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9. when balancing a chemical equation, what is it appropriate to change…
B. The coefficients of reactants and products
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4. in which type of reaction does the system gain energy from the surro…
B. Endothermic
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1. in a reaction rate experiment, if the concentration is held constant…
a. It increases
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drag descriptions (green boxes) and drop them into the correct boxes. m…
Melting: Particles speed up, Energy is added, Temperature increases (if considering heating before melting point), Solid to liquid. Condensing: Particles slow down, Energy is lost…
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ch 6 water and atmospheric moisture: waters unique properties which of …
Water molecules speed up and break free of each other, Evaporation is a cooling process.
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(a) what does chemo mean? (b) what does photo mean? (a) chemical (b) li…
A. Chemical B. Light
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which phrase best describes electronegativity? (1 point) o the partial …
the relative strength with which an element attracts electrons in a chemical bond
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based on their locations in the periodic table, which two elements are …
Nitrogen (N) and oxygen (O)
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which statement about sodium chloride is correct? (1 point) the sodium …
The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.
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which element would most likely lose electrons to form positive ions wh…
Gallium (Ga)
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4. the ionization energies of a given atom are ie₁ = 5.139 kj/mol, ie₂ …
The valence electron configuration is \(ns^1\). The large increase in ionization energy from \(IE_1\) to \(IE_2\) implies that the first electron removed is a valence electron and…
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a calorimeter contains 150 g of water at 22.0°c. a hot metal object is …
110.0 g
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a 50.0 g sample of water absorbs 1050 j of heat. if the specific heat c…
A. \(5.02^{\circ}C\)
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chapter 15 classification of matter quiz classify the following as an e…
1. Homogeneous mixture 2. Compound 3. Element 4. Heterogeneous mixture 5. Physical change 6. Chemical change 7. Chemical change 8. Chemical property 9. Physical property 10. Chemi…
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4. isotopes of carbon this image depicts three isotopes of carbon. note…
- **Part A**: B. \(6p^{+},7n^{0},6e^{-}\) - **Part B**: C. neutron
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station 4: mini - lab questions and reflection 25. define the differenc…
Endothermic reactions absorb heat (energy), while exothermic reactions release heat (energy).
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the formation of lithium fluoride (seen here) is due to a a stronger pu…
B. increased stability in the completion of fluorine’s outer shell
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match the appropriate abbreviation to each phrase. 29. (lo 5 - 2) drop …
29. h. gt 30. e. ad lib., PRN 31. b. BID, QID, q4h, h.s., a.m. 32. c. a.c., p.c. 33. f. DC, d/c 34. a. stat 35. g. NPO 36. d. HCl, NaCl, H₂O
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chapter 15 classification of matter quiz classify the following as an e…
Pure substances and mixtures.
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drag the item from the item bank to its corresponding match. this is a …
- "This is a group of protons and neutrons in the center of all atoms" → Nucleus - "Heat transfer by electromagnetic waves" → Radiation - "This is the period of time it takes for …
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read the rough - draft paragraph. (1) many people experience a sense of…
3
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part 2 determine if the following reactions are balanced, as written. i…
19) Balanced. 20) Unbalanced. Correct: \(2P_2O_5 ightarrow 4P + 5O_2\) 21) Balanced. 22) Balanced. 23) Unbalanced. Correct: \(6KOH + Co_3(PO_4)_2 ightarrow 2K_3PO_4 + 3Co(OH)_2\)
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what is the overall order of the following reaction that has a rate law…
C. second
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espan draws an atomic model for the element neon (ne) using information…
B. ten protons and ten electrons
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18) an instructor is planning to demonstrate the reaction below to a cl…
- **Question 18**: B. Use 0.2 M HCl - **Question 19**: Balanced. Synthesis reaction - **Question 20**: Not balanced. \(2P_{2}O_{5}\to4P + 5O_{2}\). Decomposition reaction - **Ques…
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15) chefs often marinate meat in liquid before cooking to soften it and…
15. D. adding 16 oz. of water to the bowl, along with the marinating liquid 16. B. endothermic 17. B. Eating a TUMS to calm your upset stomach.
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espan draws an atomic model for the element neon (ne) using information…
B. ten protons and ten electrons
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espen draws an atomic model for the element neon (ne) using information…
B. ten protons and ten electrons
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part 1 answer the following multiple - choice questions. write your ans…
1. C. Lighting a match 2. A. exothermic 3. C. the properties and identity of the reacting substances 4. C. 5 grams
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for each element, drag and drop the orbitals into the correct order. (h…
- Lithium: \(1s^{2}2s^{1}\) - Carbon: \(1s^{2}2s^{2}2p^{2}\) - Fluorine: \(1s^{2}2s^{2}2p^{5}\)
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silicon argon magnesium the alkaline earth metal in period 3 the noble …
| Electron Configuration | Name of Element | |--|--| | \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}\) | Silicon | | \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\) | Argon | | \(1s^{2}2s^{2}2p^{6}3s^{2}\)…
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what is the mass of the red liquid? 100g 60g
\(60g\)
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how is electron movement related to the bonding in sodium chloride? a t…
C. Electrons exchange creating ions to form an ionic bond by electrostatic attraction.
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what is the mass of the blue liquid? 100g 40g
\(40g\)
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what would be the mass of the product on the right side of the arrow? 4…
\(40g\)
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a chemist made the table below to record some atomic properties of four…
A. Krypton is the least reactive because it has 8 electrons in the outer shell
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in this chemical reaction, what is the total mass of the reactants to t…
40g
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match the definition to the electron rule. aufbau principle hunds rule …
- Aufbau Principle: electron orbitals are filled from the lowest energy to the highest energy. - Hund's Rule: empty orbitals in a level are filled with one electron before they pa…
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in atoms, electrons surround the nucleus in a random patterns. b specif…
B. specific energy levels
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changing your toilet can reduce water pollution because ________. a. th…
D. more efficient plumbing uses less water and creates smaller volumes of waste
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an electron orbital can hold electron(s).
2
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why would the mass of the products of burning a campfire be the same as…
because matter CANNOT be created nor destroyed
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which of the following is true of matter during chemical reactions? dur…
"During chemical reactions, matter is neither created nor destroyed; it just changes form" is the correct statement.
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match the subshell/sublevel to the amount of electrons it can hold. 2 6…
s - 2, p - 6, d - 10, f - 14
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#8 chemistry a schoology 2025 we can tell the exact location of electro…
False
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a bustling university area has over a dozen different independent coffe…
Monopolistic Competition
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conductivity and solubility many ionic compounds can dissolve in water.…
1. **Melting Point Test**: Heat each unknown solid. If a solid has a high melting point (similar to known ionic compound melting points like NaCl’s ~800°C or MgO’s >2800°C), it co…
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ccc matter and energy explain how you would expect the strength of the …
The ionic bonds in \(LiBr\) are stronger than those in \(KBr\).
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physical and chemical changes complete the paragraph using words from t…
1. Changes 2. chemical 3. appearance 4. cutting 5. transforms 6. vinegar 7. physical 8. original
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question 5 (2 points) when a neutral sulfur atom gains two electrons to…
\[ [Ar] \]
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question 4 (2 points) which of the following elements forms an ion with…
Al
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question 3 (2 points) when forming ions, all elements desire to be: tra…
noble gases
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question 1 (5 points) match each verb to the word(s) that are most rela…
**Question 1** 1. e 2. a 3. c 4. d 5. b **Question 2** 1. séchez 2. se maquille 3. habillons
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which element has the following electron configuration? 1s²2s²2p⁶3s²3p⁶…
Ge
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question 1 (2 points) which region of the periodic table shown below is…
red
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which of the following is the correct orbital diagram for o?a. 1s² 2s² …
A.
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you should always squeeze your eyes shut when a chemical splashes into …
B. False
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question 3 (2 points) the abbreviated electron configuration for p is: …
[Ne]\(3s^{2}3p^{3}\)
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question 2 (2 points) what does the angular momentum quantum number des…
shape
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19. the diagrams below show a model airplane. which energy transformati…
19. D. Potential energy stored in the rubber band is transformed into mechanical energy used by the propeller. 20. A. X: solar energy, Y: mechanical energy
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question 1 (2 points) the electron configuration of the element whose a…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}\) (the fourth option)
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what term describes a chemical reaction that absorbs heat energy? exoth…
1. Endothermic 2. Exothermic 3. Measure the temperature of the reaction at the beginning and end
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task: nuclear fusion and nuclear fission activity 2 of 5 for the isotop…
The total number of protons is \(1\) and the total number of neutrons is \(0\).
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espen draws an atomic model for the element neon (ne) using information…
B. ten protons and ten electrons
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the inflammatory response involves chemical and physical barriers that …
F
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an individual was exposed to a contagious disease but did not become in…
B. physical barrier
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like hydrogen, iron will also chemically react with oxygen to produce a…
A.
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16. which of the following statements best describes the energy transfo…
16. B. Chemical energy changes to heat and light energy. 17. A. Only when the ball rolls from Position 1 to Position 3.
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13. to answer this question, refer to \the roller coaster design\ passa…
13. C. As the car moves, potential energy is transformed into kinetic energy, and vice versa, keeping the total mechanical energy constant. 14. C. Use coaster cars with different …
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use the drop - down menus below to complete the statement about the bur…
First blank: oxygen; Second blank: oxygen
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which statement best explains why knowing the melting and boiling point…
C. After a chemical change, the melting point and boiling point should be different for products and reactants.
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bromine, chlorine, fluorine, and lodine are four elements in group 17 t…
B. The number of electron shells is increasing and electronegativity is decreasing.
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the graph represents the atomic radii of the elements in period 3 on th…
B. decreasing
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which of the following elements would have similar properties to lithiu…
B. Potassium (K), C. Sodium (Na)
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predict the average dissolving time if the substance was placed in boil…
12 seconds
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7. cassandra notices that when she breathes on a cool window, the water…
7. D. Heat leaves the water vapor as it touches the cool window. 8. A. A geologist’s hypothesis about how the Grand Canyon formed. 9. C. Many other students recorded data similar …
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the image below shows a model of an atom. what is the subatomic particl…
B. electron
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water type dissolving time (s) average dissolving time (s) trial 1 tria…
The substance dissolved fastest in hot water.
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mrs. browns class is learning how to compare and classify matter based …
The melting point is the temperature at which a substance changes from a solid to a liquid, while the boiling point is the temperature at which it changes from a liquid to a gas.
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please match the category of drug with the proper definition. club drug…
Club Drugs - Drugs that are used at dance clubs, bars, raves, and parties. Can include many types of drugs. Depressants - Drugs that slow down the central nervous system. Prescrip…
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based on this information, which one of the following elements has phys…
Germanium (Ge)
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the two beakers shown below contain pure water. which property is the s…
Density
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the periodic table of the elements explain three an atomic model for th…
B. ten protons and ten electrons
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task: nuclear fusion and nuclear fission activity 3 of 5 for the isotop…
The number of protons is \(1\) and the number of neutrons is \(2\).
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state, in terms of neutrons, why oxygen - 18 has a greater mass than ox…
It has more neutrons.
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match the words in the first column to the best available answer in the…
1. Radiation 2. Magnetron tubes (assuming this was a mis - write and should be magnetron) 3. Molecules 4. Radar 5. Magnetron 6. Atomic motion 7. Exciting 8. Conduction 9. Microwav…
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which lewis electron - dot diagram represents an oxygen - 16 atom in th…
A.
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q.12. which of the following trends correctly matches the periodic patt…
B. Atomic radius ↓ across period, metallic character ↓ across period
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question 1-12 melissas physical science teacher provides her with four …
Substance A
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q.13. which statement correctly describes the relationship between atom…
C. Larger atoms have lower ionization energies
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fill in the table below with the correct model, molecular geometry, and…
| Formula | Shape/Model (Image) | Molecular Geometry/Name | Bond Angle | | ---- | ---- | ---- | ---- | | \(H_2O\) | Bent - like (V - shaped) | Bent | \(104.5^{\circ}\) | | \(CO_2\…
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reviewing vocabulary match each term with its definition. metallic bond…
metallic bond - the bond formed when metal atoms share many mobile electrons; electron sea theory - metals bond to other metals by sharing many "floating" electrons; malleability …
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which of the following statements best describes the elements with simi…
Sodium (Na) and potassium (K) are most similar because they are in the same group.
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the element gallium has two stable isotopes, gallium - 69 and gallium -…
The average atomic mass of Gallium is approximately \( 69.72\space g/mol \)
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match the words in the first column to the best available answer in the…
1. 7 - exciting 2. 6 - atomic motion 3. 5 - magnetron 4. 3 - molecules 5. 9 - microwave energy 6. 5 - magnetron 7. 1 - radiation 8. 10 - radio wave signal 9. 9 - microwave energy …
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juan is reviewing his notes from todays science class on the periodic t…
Boron (B)
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a solution contains 0.102 mol ca(no₃)₂ and 0.927 mol h₂o. calculate the…
\(88.8\) Torr