化學
化學反應、化學計量、分子結構與元素性質。
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use this graphic organizer to become familiar with the different types …
| Type of Chemical Bonding | Definition | Examples in the real world | |--|--|--| | Metallic | Electrostatic attraction between delocalized electrons and metal ions | Copper in el…
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structure 3: :n - n≡o: formal charge for o = 0 formal charge for n (lef…
$\ddot{N}=N=\ddot{O}$
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for each resonance form, determine the formal charge for each atom. str…
Structure 1: Formal charge for N (left) = 0 Formal charge for N (center) = 1 Formal charge for O = - 1 Structure 2: Formal charge for N (left) = 1 Formal charge for N (center) = 1…
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clue 5 detective: all detectives evidence: investigators noticed a burn…
1. It was an open system. In an open system, matter can be exchanged with the surroundings. During the reaction, some of the products in gaseous form could have escaped, making it…
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identify the possible resonance structure(s) for n₂o. check all that ap…
\(:\ddot{N}-O\equiv N:\), \(\dot{N}=O=\dot{N}\), \(:\ddot{N}-N\equiv O:\), \(\dot{N}=N=\dot{O}\)
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identify the correct lewis structure for if4+. select the single best a…
The second structure from the top (where I has a lone - pair and each F has 3 lone - pairs and is singly bonded to I)
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model 3 - proposed average atomic mass calculations marys method (78.99…
Mary's method: $24.405$ amu Jack's method: $24.305$ amu Alan's method: $24.984$ amu
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identify the correct lewis structure for if₄⁺. select the single best a…
The first option (where iodine has 4 single bonds to fluorine atoms, iodine has 1 lone - pair, and each fluorine has 3 lone - pairs, and the whole structure is in square - planar …
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identify the correct lewis structure for no₂⁺. select the single best a…
$[\ddot{O}=N-\ddot{O}:]^{+}$ (the third option in the list provided in the question)
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identify the correct lewis structure for so4^2-. select the single best…
The Lewis structure has S in the center, double - bonded to 2 O atoms and single - bonded to 2 O atoms, with 2 lone - pairs on each of the double - bonded O atoms and 3 lone - pai…
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level 1 q1 physical properties can be observed and measured without cha…
Q1: A. Appearance Q2: C. Flammability
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level 1 q3 what is the measure of the amount of matter in a substance o…
Q3. D. Mass Q4. A. Chemical property
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identify the correct lewis structure for so₄²⁻. select the single best …
The third option (the one with S single - bonded to 4 O atoms and all atoms having octets and the overall 2 - charge)
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naming and formula for polyatomic compounds 73. calcium nitrite ca(no2)…
74. Barium sulfate 75. $AgC_2H_3O_2$ 76. Strontium sulfite 77. $Ni_3(PO_4)_2$ 78. Sodium carbonate 79. Lithium hydrogen carbonate 80. $(NH_4)_3PO_4$ 81. Beryllium hypochlorite 82.…
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identify the correct lewis structure for so₃²⁻. select the single best …
The third option (where S is single - bonded to two O atoms with a negative charge on each of those O atoms and double - bonded to one O atom) is the correct Lewis structure for $…
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identify the correct lewis structure for c₄h₆. select the single best a…
The first structure $H - C - C\equiv C - C - H$
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your friend tells you that they are smoking e - cigarettes instead of r…
E - cigarettes are addictive., E - cigarettes contain nicotine., E - cigarette flavorings often contain harmful chemicals.
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your friend tells you that they are smoking e - cigarettes instead of r…
E - cigarettes are addictive., E - cigarettes contain nicotine., E - cigarette flavorings often contain harmful chemicals.
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your friend tells you that they are smoking e - cigarettes instead of r…
E - cigarettes are addictive. E - cigarettes contain nicotine. E - cigarette flavorings often contain harmful chemicals.
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the aqueous rocks, sometimes called the sedimentary, or fossiliferous, …
C. 3rd person limited, Objective
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instructions: read each paragraph. decide if the passage is from the fi…
1. c. 3rd person limited, Objective 2. c. 3rd person limited, Objective
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each atom of an element has the following electron configuration. 1s²2s…
iodine
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two representations of the distribution of electrons in the potassium a…
D. Both models because each shows an electron in the outermost shell.
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which is the electron configuration for zinc? 1s²2s²2p⁶3s²3p⁶4s²3d⁸ 1s²…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ (the third option in the list)
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to show the electron configuration for an atom, what is the advantage o…
Orbital notation shows the spin of the electrons.
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which is the electron configuration for boron? 1s²2s³ 1s²2s²3s¹ 1s¹2s²2…
1s²2s²2p¹ (the last option)
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4. consider the following equilibrium: hno2(aq) + h2o(l) ⇌ h3o+(aq) + n…
A. The equilibrium will shift to the right because \(NaOH\) reacts with \(H_3O^+\), decreasing its concentration and the system tries to replenish it. B. The equilibrium will shif…
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consider the model of a sodium atom. which feature does the model show …
the distribution of electrons in different shells
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which diagram shows a pair of electrons that have opposite spins?
The first option with two arrows (one up and one down) in a single box shows a pair of electrons with opposite spins.
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the electron configuration for magnesium is shown below. 1s²2s²2p⁶3s². …
(No diagrams are provided in the text to choose from, but the correct distribution should have 2 electrons in the innermost shell, 8 in the second - shell, and 2 in the outermost …
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consider the electron configuration. which element has this electron co…
C. chlorine
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which characteristic is given by the principal quantum number? orbital …
orbital size
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a student takes notes in class. sound waves i. created by a vibration a…
None of the above (assuming there is an option like that, since no error is present in the given notes). If we have to choose from the provided options, the question has an incorr…
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44. cabr₂ 45. ba₃p₂ name to formula to find the formula you must first …
53. $Rb_2S$ 54. $HgO$ 55. $Ca_3N_2$ 56. $Zn(C_2H_3O_2)_2$ 57. $UF_6$ 58. $Ag_3P$ 59. $Cu_3N$ 60. $Mg(OH)_2$ 61. $Cs_2C_2O_4$ 62. $Pb(NO_2)_2$ 63. $Ca_3(PO_4)_2$ 64. $SnF_4$ 65. $F…
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the rust that appears on steel surfaces is iron(iii) oxide. if the rust…
$23.4\ g$
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the source of bitterness in dark chocolate is the compound theobromine,…
$112$ mg
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3. consider the following equilibrium: $caco_3(s) ightleftharpoons ca^{…
A. The equilibrium will shift to the left because the concentration of $CO_3^{2 - }$ increases. B. The equilibrium will shift to the left because the concentration of $Ca^{2 + }$ …
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how many molecules of nh₄br are in 2.991 g of nh₄br? show the conversio…
$1.81\times 10^{22}$ molecules
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how many grams of hno₃ are in 2.005×10²² molecules of hno₃? show the co…
2.09
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question 10 of 15 > a patient is having an allergic reaction and takes …
$6.11\times 10^{19}$ molecules
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question 10 1 part | -- of 1 point which statement is true regarding ca…
Calcium is found in crystals called hydroxyapatite.
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consider a sample containing 0.320 mol of a substance. how many atoms a…
lead: $1.93\times10^{23}$ atoms gold: $1.93\times10^{23}$ atoms $C_6H_6$: $1.93\times10^{23}$ molecules
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question 2 of 15 if there are 5.40 moles of h, how many moles of each o…
1. For $H_2SO_4$: 2.70 mol 2. For $C_2H_4O_2$: 1.35 mol 3. For $NaOH$: 5.40 mol
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f) 6 atomes de carbone, 12 atomes d’hydrogène et 6 atomes d’oxy 7 le so…
Non, il n'est pas risqué de mettre du sel de table sur nos aliments car le chlorure de sodium est un composé stable avec des propriétés chimiques différentes de celles des élément…
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using the same knife and cutting board to prep raw chicken and raw beef…
A. Cross - contamination
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a patient is having an allergic reaction and takes a 25.0 mg tablet of …
$6.45\times 10^{19}$ molecules
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when pathogens transfer from one place to another, we call this______? …
A. Cross - contamination
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galaxy ngc 11051, distance: 1 billion lightyears wavelength: 400 nm ene…
1. Elements are iron and hydrogen. 2. Circle iron. 3. Draw an atom with nucleus having 26 protons and 30 neutrons, and 4 electron - shells with 2, 8, 14, 2 electrons in order from…
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name: 2.03 exit ticket/homework. working silently and independently, an…
1. c. atoms of a given element must be identical 2. c. atoms of a given element must be identical 3. c. Plum Pudding Model 4. Cannot be answered without seeing the pictures.
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6 quelle molécule obtiendra - t - on si on combine les atomes suivants?…
a) $NH_3$ b) $H_2O$ c) $Cl_2$ d) $C_4H_{10}$ e) $H_2O_2$ f) $C_6H_{12}O_6$
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suppose you have two samples that are equal in weight, 12.3 g sr and 12…
12.3 g Sr = 0.113 mol 12.3 g Fe₂O₃ = 0.077 mol
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c₄h₄: blank g/mol c₁₃h₂₀o₂: blank g/mol
For \(C_4H_4\): 52 g/mol; For \(C_{13}H_{20}O_2\): 208 g/mol
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chemistry: fundamentals and principles presented by macmillan learning …
lead: $1.93\times 10^{23}$ atoms gold: $1.93\times 10^{23}$ atoms $C_6H_6$: $1.93\times 10^{23}$ molecules
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question 2 of 15 if there are 5.40 moles of h, how many moles of each o…
$H_2SO_4$: 2.70 mol $C_2H_4O_2$: 1.35 mol $NaOH$: 5.40 mol
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read the citation and abstract below. based on the abstract, what are t…
B. Relationships C. Classroom Environment
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4 indiquez les noms des éléments qui composent les molécules suivantes …
a) Hydrogène (2 atomes), Oxygène (1 atome) b) Carbone (3 atomes), Hydrogène (8 atomes) c) Magnésium (1 atome), Chlorure (2 atomes) d) Sodium (1 atome), Chlorure (1 atome) e) Fer (…
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galaxy ngc 11510, distance: 5 billion lightyears age: 7 billion years w…
1. Carbon, Hydrogen 2. Circle Carbon 3. Draw a nucleus with 6 protons and 6 neutrons. Draw two electron - shells around the nucleus. The inner shell has 2 electrons and the outer …
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a compound is 54.53% c, 9.15% h, and 36.32% o by mass. what is its empi…
empirical formula: $C_{2}H_{4}O$ molecular formula: $C_{6}H_{12}O_{3}$
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what is the empirical formula of a compound composed of 69.94% fe and 3…
$Fe_2O_3$
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what is the empirical formula of a compound composed of 3.25% hydrogen …
$CH_2O_3$
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read the text. then, add the best concluding sentence. dissolving salt …
This process demonstrates how electrical charges in water and salt can create a uniform solution.
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periodic table scavenger hunt search your periodic table for the answer…
1. Silicon 2. Cf 3. 83 4. Group 18 (Noble - Gases) 5. Cadmium 6. Approximately 12.01 7. Lanthanide series 8. Gold 9. Hydrogen 10. Technetium 11. Lithium 12. False 13. Francium 14.…
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arrange the fertilizers in decreasing order of mass percentage of nitro…
$NH_3,NH_4NO_3,(NH_4)_2SO_4,(NH_4)_2HPO_4,KNO_3,(NH_4)H_2PO_4$
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air temperature is related to air pressure in that...(select all that a…
B. increasing temperature would increase the energy of the molecules, thus increasing the pressure. C. increasing temperature would increase the velocity of the molecules, thus in…
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calculate the percent composition by mass of each element in kclo₃.
Percent - mass of $K\approx31.90\%$, Percent - mass of $Cl\approx28.93\%$, Percent - mass of $O\approx39.17\%$
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1. identify the heaviest element. 2. draw a neutral atom of only the he…
1. Elements present: helium, hydrogen 2. Circle helium 3. In the nucleus of the drawn atom: P: 2, N: 2
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what does water react with in the atmosphere to form carbonic acid to m…
carbon dioxide
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matching the scientists with their atomic models match the scientists w…
Ernest Rutherford - central nucleus with electrons that orbit at a distance Democritus and Dalton - indivisible sphere J.J. Thomson - electrons mixed in a positive sphere, also ca…
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use the peel method (point, explanation, evidence, link). essay topic: …
Point: Social media platforms have played a big role in cost - effective marketing strategies for small businesses.
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object name|used for ---|--- |used to pick up or hold hot objects |prot…
1. Tongs 2. Goggles 3. Beaker 4. Test tube 5. Balance 6. Lab coat 7. Dropper 8. Spark lighter 9. Clamp 10. Graduated cylinder 11. Lab stand 12. Funnel 13. Bunsen burner 14. Flask
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24. explain how electrons cause the emission of light. in your answer b…
电子吸收能量从低能级跃迁到高能级，处于激发态。由于激发态不稳定，电子又从高能级跃迁回低能级，以光子形式释放能量产生光。示意图（此处文字描述绘制要点：画出原子核、不同能级轨道、电子跃迁箭头） ### 25.
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the purpose of a catalyst is... to increase the equilibrium amount of p…
to increase the reaction rate.
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5. what determines the identity of an element? number of neutrons atomi…
5. Atomic number (number of protons) 6. Orbiting the nucleus 7. Neutron 8. Atomic mass 9. All atoms of the same element are identical, Atoms are indivisible 10. Protons, Neutrons
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how does increasing reactants concentrations increase the rate of a rea…
Increasing the frequency of collisions
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how does a catalyst increase the rate of a reaction? lowering the $delt…
Lowering the $E_a$
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how does increasing temperature increase the rate of a reaction? loweri…
D. Increasing the frequency of collisions and the proportion of molecules with sufficient energy, the $E_a$
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which of the following would change the activation energy of a reaction…
B. Adding a catalyst
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if this reaction was catalyzed, what would change in this diagram? noth…
The $E_a$ would move to the left, indicating a decrease.
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how does increasing temperature increase the rate of a reaction? loweri…
C. Increasing the frequency of collisions and the proportion of molecules with sufficient energy, the $E_a$
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how does a catalyst increase the rate of a reaction? lowering the δh in…
Lowering the $E_a$
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which of the following would change the enthalpy of a reaction? adding …
Changing the temperature
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which of the following would change the equilibrium ratio of the produc…
D. Changing the temperature
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26. use the aufbau diagram to draw the orbital notation of fe (3 points…
The orbital notation is as described above, and Fe has 4 unpaired electrons.
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dalton determined that a chemical reaction was simply a(n) of atoms, no…
rearrangement
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which concept explains why increasing the temperature generally increas…
B. More frequent and energetic collisions
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19. an atom has an atomic number of 15 and a mass number of 31. how man…
16
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18. an atom has an atomic number of 15 and a mass number of 31. how man…
15
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15. what is the symbolic notation for an atom with 8 protons and 10 neu…
$_{8}^{18}O$
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which factor increases the rate of a chemical reaction by providing an …
C. Catalyst
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14. carbon - 14 has 6 protons. how many neutrons does it have?
8
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what is the main focus of collision theory in chemical reactions? a. th…
B. The likelihood of effective collisions
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12. the center of the atom is called the electron neutron nucleus proton
Nucleus
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q 11. the number of protons in an atom. number identifies the number at…
Atomic Number
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identifying the basis for daltons t daltons theory was identified using…
C. water vapor and air experiments
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17. which rule states that electrons must occupy the lowest energy orbi…
17. a. Aufbau Principle 18. b. two, if they have opposite spins 19. d. Violet 20. b. the 2s orbital is at a higher energy level 21. d. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$ 22. b…
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multiple - choice question water is a super mixture solvent
B. solvent
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assume that 5g of compound a reacts with 8g of compound b. a solid is p…
8 g, since according to the law of the conservation of mass, the total mass of the system should be 13 g. Since the solid is 5 g, the remaining mass of the gas is 8 g.
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8. which element has the following electron configuration: 1s²2s²2p⁶3s²…
8. c. Ru 9. a. Cobalt 10. d. 3p 11. b. energy must be absorbed 12. c. speed 13. a. orbital shape 14. b. Erwin Schrödinger 15. a. gamma rays 16. b. 3
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multiple - choice question when water molecules stick to other things i…
B. adhesion
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what are solutions? a mixture of two or more solids that do not interac…
A special type of mixture where one substance is uniformly dissolved in a liquid.