化学
化学反应、化学计量、分子结构与元素性质。
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question 1 (2 points) what is the oxidation number of p in h₃po₄? +5 +3…
+5
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multiple - choice question the current model of an atom is called the q…
quantum model
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what does each box on the periodic table represent? a) a molecule b) an…
1. C. An element 2. Silver (Ag) 3. B. 6
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all these elements belong to the same family. what family do they belon…
Halogens
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what is the smallest unit of an element? a) atom b) molecule c) proton …
1. A. Atom 2. Alkali Earth Metals (Note: There is a mis - naming in the options, it should be Alkali Metals. But based on the closest option, this is the answer)
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all these elements belong to the same family. what family do they belon…
Transition Metals
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choose all the correct observations and conclusions of john dalton. ele…
- Common substances always broke down into the same elements in the same proportions - various compounds were combinations of atoms of different elements - atoms could not be crea…
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choose all the correct observations and conclusions of john dalton. ele…
- Common substances always broke down into the same elements in the same proportions - various compounds were combinations of atoms of different elements - atoms could not be crea…
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what are the vertical columns on the periodic table called? a) periods …
C. Groups, D. Families
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ch 15 permanent wave tools and supplies quiz question 1 of 2 3 points m…
captures solution before it drips on the floor or client's shoulders and back - neutralizing bib used for double draping and to protect a client - chemical cape keeps solution fro…
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activity b (continued from previous page) 3. classify: with the gizmo, …
4A. Polar bonds 4B. The molecule is non - polar overall due to symmetry (tetrahedral shape), so individual bond dipoles cancel and there is no net dipole moment to cause rotation …
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activity b (continued from previous page) 3. classify: with the gizmo, …
4. A. Polar bonds B. The molecule is symmetrical (tetrahedral), so the overall dipole moment is zero and there is no net force to cause rotation in the electric field. C. CO₂ 5. A…
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“collaboration with the library’s scientists has helped us, quite liter…
A. positive
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name: review scientific key pol date: block: review homework - due wedn…
A. Cube Z is twice as dense as Cube Y.
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ch 15 pre - service chemical texture guidelines quiz question 1 of 5 1 …
Select three test areas on the head. Immerse at least 20 strands of hair in the solution for 30 minutes. Run a neutralizing shampoo (hydroxide relaxer) or neutralizer (thio relaxe…
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3 ccc patterns draw the electron dot structures for the ions formed by …
For $N^{3 - }$: Draw the symbol N with 8 dots around it. For $O^{2 - }$: Draw the symbol O with 8 dots around it. For $F^{-}$: Draw the symbol F with 8 dots around it.
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chemical texture services ch 15 relaxer strand test sequence order the …
1. Select a strand at the back, and one on each side of the head. 2. Separate each strand from the rest of the hair, apply the relaxer as directed, and monitor the relaxation proc…
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question 15. select the correct nuclear notation for the isotope of sod…
$_{11}^{23}Na$ (corresponding to the second option in the multiple - choice list)
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fusion/melting→solid to liquid freezing→liquid to solid vaporization/bo…
| | Phase Change | Chemistry Term | Change in Energy | | ---- | ---- | ---- | ---- | | Heat up butter | Solid to liquid | Fusion/Melting | Increasing | | Putting water in freezer …
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question 14. an isotope of chlorine called chlorine - 37 has protons, n…
17, 20, 17
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beat! beat! drums!--blow! bugles! blow! make no parley--stop for no exp…
it doesn't follow a rhyme scheme
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question 13. which statement describes two different isotopes of carbon…
The isotopes contain different mass numbers but have the same atomic number.
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question 1 of 1 5 points match the relaxer tool with the description wh…
1. used to detangle and smooth the hair - wide - tooth comb 2. protects clients from the chemical cape - neck strips 3. used to apply the relaxer - styling comb 4. used on the sca…
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question 12. which phrase describes two atoms that contain the same num…
B. Isotopes of the same element.
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the prisoner read an extraordinary amount, quite haphazard. now he woul…
The diction conveys to the reader a sense of hopelessness.
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question 11. if two atoms are isotopes of the same element, the atoms m…
the same number of protons and a different number of neutrons
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substances have specific characteristics called chemical properties, wh…
$0^{\circ}C$; Molecules; liquid; Melting; Energy; gas; Boiling Point
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question 10. which two notations represent isotopes of the same element…
$^{14}_{7}\text{N}$ and $^{18}_{7}\text{N}$
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question 9. which notations represent hydrogen isotopes? o ₁¹h and ₂⁴h …
D. $_{1}^{1}\text{H}$ and $_{1}^{2}\text{H}$
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question 8. the numbers of protons and neutrons in each of four differe…
C. E and D
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molecule: dopamine molecular formula: c8h11no2 how many different atoms…
- How many DIFFERENT atoms are in your molecule? 4 (carbon, hydrogen, nitrogen, oxygen) - What are the different atoms in your molecule? Carbon, Hydrogen, Nitrogen, Oxygen - Types…
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which statement best explains how enzymes speed up chemical reactions? …
Enzymes lower the activation energy of a reaction.
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solutes are molecules that expand the water in a given area. solutes ar…
Solutes are molecules that can dissolve in water.
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question 7. an atom that has 13 protons and 15 neutrons is an isotope o…
C. aluminum
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electrons, and neutrons in each of the following isotopes: magnesium-24…
| Isotope | Number of Protons | Number of Electrons | Number of Neutrons | | ---- | ---- | ---- | ---- | | Magnesium - 24 | 12 | 12 | 12 | | Magnesium - 25 | 12 | 12 | 13 | | Magn…
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molecule: dopamine molecular formula: type your answer here how many di…
Molecular Formula: $C_8H_{11}NO_2$ Number of different atoms: 4 Types of atoms: Carbon, Hydrogen, Nitrogen, Oxygen # in molecule: 8 (Carbon), 11 (Hydrogen), 1 (Nitrogen), 2 (Oxyge…
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question 5. complete the following table concerning the three isotopes …
| Isotope | Number of Protons | Number of Electrons | Number of Neutrons | | ---- | ---- | ---- | ---- | | Silicon - 28 | 14 | 14 | 14 | | Silicon - 29 | 14 | 14 | 15 | | Silicon …
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question 4. is the following statement true or false? if the statement …
True
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14 multiple choice 5 points free energy is always negative. usable ener…
B. usable energy
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question 3. neon-20 and neon-22 are called
Isotopes
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question 2. how are the isotopes of a particular element alike? how are…
Alike: They have the same number of protons and thus the same chemical properties. Different: They have different numbers of neutrons and different atomic masses.
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most lipids contain long chains of which two atoms? carbon and hydrogen…
carbon and hydrogen
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question 1. what are isotopes?
Atoms of the same element with different numbers of neutrons.
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unit 3 - the mole quiz show your all your work. record your final answe…
1. $261.35\ g/mol$ 2. $440\ g$ 3. $7.95\ L$ 4. $5.22\times10^{23}$ particles
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18 ccc patterns electron affinity and ionization energy appear to be op…
Both electron affinity and ionization energy trends are governed by nuclear charge and atomic size. In a period, increasing nuclear charge leads to higher values for both. In a gr…
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what is matter? tips for success • read the assignment carefully and ma…
Methane is a compound (a pure substance) as it is made of carbon and hydrogen chemically combined. Diamond is an element (a pure substance) as it consists only of carbon atoms. Th…
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activity b: molecular polarity get the gizmo ready: select the molecula…
1. A. Polar B. The H₂O molecule aligns with the electric field. C. The oxygen - rich side (negative side) is attracted to the positive plate because oxygen has a partial negative …
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6a. make a claim as to why sodium carbonate caused this change.
Sodium carbonate is a base and can react with acids or certain metal - ions, causing the observed change depending on the reaction system.
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29. which of the following procedures requires both gloves and goggles …
29. A. Controlling a wound that is spurting blood 30. B. Reverse isolation 31. B. fungi 32. A. virus 33. C. bacteria 34. D. helminth 35. C. bacteria
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“is” questions: part 2 5. what did you notice when the sodium carbonate…
Effervescence (bubbling) may be observed due to the production of carbon dioxide gas, and there may be a temperature - change as the reaction is exothermic.
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swap out the solar panel for the generator. then, swap out the sun for …
thermal, mechanical
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mr. emmer gave a test in his chemistry class. the scores were normally …
A. 0.0013
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mr. emmer gave a test in his chemistry class. the scores were normally …
A. 0.9332
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question 7 (5 points) stanley was diagnosed with lymphoma and had to un…
B. conditioned response
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set the slider under the cyclist to its maximum value. observe the cycl…
1. Thermal 2. Increase 3. Heat transfer
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4. it’s not unusual for students who see this demonstration to claim th…
Analyze chemical composition (elemental analysis for iron and oxygen), test for characteristic chemical reactions (e.g., with acids), and examine crystal structure (using X - ray …
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after some time, the cyclist will stop pedaling and the \feed me\ butto…
The cyclist has used up all of the chemical energy.
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value: 3 mr. emmer gave a test in his chemistry class. the scores were …
B. 68%
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4. it’s not unusual for students who see this demonstration to claim th…
Perform acid - reaction and iron - ion test, and test for oxygen through decomposition and product - detection.
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which atmospheric gas is the lightest because it only has one proton an…
D. hydrogen
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move the slider beneath the cyclist to the middle and observe the movem…
Most of the chemical energy in the cyclist is transformed into mechanical energy to spin the wheel in the generator. It is then turned into electrical energy as it travels to the …
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to begin, click on \systems.\ then, check the \energy symbols\ box to v…
The water has thermal energy., The cyclist has chemical energy.
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mid - term study guide 37. which statement best describes the physical …
A. Enlargement of the cracks occurs because water expands when it freezes. ### 38
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what happens if the number of protons in an atom change? the number of …
It becomes a different element
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1) 2 examples of a substance? 2) 2 examples of mixtures! 3) 3 examples …
1. Water, salt 2. Air, salt - water solution 3. Elements: Oxygen, hydrogen, gold; Compounds: Water, carbon - dioxide, sodium chloride 4. Muddy water, chalk - water mixture 5. Milk…
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its focus on logos logos is an appeal to logic; it is a means of convin…
## Task One: 1. Effective. Explanation: Uses logical syllogism with general and specific statements. 2. Not effective. Explanation: False premise. 3. Effective. Explanation: Logic…
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question 9 10 pts element/ion atomic # # of protons # of neutrons # of …
| Element/Ion | Atomic # | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | | $^1_1H$ | 1 | 1 | 0 | 1 | | $^1_1H^+$ | 1 | 1 | 0 | 0 | Question …
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question 8 10 pts how many neutrons are in this isotope: $^{14}_{6}c$?
8
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questions: 8. if you spray iodine on paper, what would you expect to ha…
8. The paper would not turn blue - black. Because paper is mainly cellulose and iodine doesn't react with cellulose to give a blue - black color. 9. If there was starch on the pap…
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directions: complete the following chart | isotope | mass number | numb…
13. 226 14. 88 15. 138 16. Cancer treatment (radiation therapy) 17. Half - life 18. Protons, neutrons, and electrons 19. Radioisotope
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1. determine the elements group number and number of valence electrons …
21. Fluorine: 7; Phosphorus: 5; Calcium: 2; Nitrogen: 5; Strontium: 2; Argon: 8; Potassium: 1; Helium: 2; Magnesium: 2; Sulfur: 6; Hydrogen: 1; Aluminum: 3; Barium: 2; Oxygen: 6; …
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1) 2 examples of a substance - 2) 2 examples of mixtures - 3) 3 example…
1. Pure water, gold 2. Salt - water solution, air 3. Elements: oxygen, hydrogen; Compounds: water, carbon - dioxide 4. Muddy water, sand - water mixture 5. Milk, fog 6. Sugar - wa…
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name: bianca date: student exploration: ph analysis: quad color indicat…
1. A. Sour - B. Stinging 2. A. Slippery - B. Bitter - C. Burning/stinging 3. 1. Dark blue - 2. Around 11 - 12; Alkaline
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5. experiment: turn on show electronegativity. electronegativity (en) d…
1. For two non - metals with small (or no) EN difference: The shared electrons are shared equally. 2. For two non - metals with large EN difference: The valence electrons are pull…
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10. factors that increase the speed of chemical reactions include a. in…
A. increasing the temperature, C. increasing the concentration of the reactants, D. catalysts
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5. experiment: turn on show electronegativity. electronegativity (en) d…
For the first question about two non - metals with small (or no) EN difference: The shared electrons are attracted equally by each atom, forming a nonpolar covalent bond. For the …
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mid - term study guide 29 why does earth have a magnetic field? plate t…
29. Earth's magnetic field is generated by the motion of molten iron - nickel in its outer core creating electric currents via the dynamo effect. 30. Under the continents. 31. Und…
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short answer essay 11. why is a study of basic chemistry essential to u…
11. Chemical reactions underlie physiological processes. 12. Energy causes matter to move/change; capacity to do work. 13. Kinetic is energy of motion, potential is stored; can co…
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what is capillary action? the ability to get into small spaces and redu…
When water molecules grabbing at the walls of a vessel, drawing the water upward even against the effects of gravity
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question 1 (1 point) listen how would you prepare a 15% sugar solution?…
5) All of the above
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water resists changing its temperature a high polar and ionic. universa…
specific heat
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part f: interpreting the periodic table use your periodic table to find…
1. 3 2. 24.31 3. Pb 4. +1, +2 5. Calcium 6. Fluorine 7. Xe 8. 183.84 9. Carbon 10. 0
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q1 chemistry: do now: for each multiple - choice question below, use st…
1. c. Na⁺ 2. a. S⁻² and Cl⁻¹ 3. I calculated the number of electrons in each ion/atom based on their atomic numbers and the charge on the ion. 4. They have similar chemical and ph…
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3. experiment: turn off show polar molecule inset and show nonpolar mol…
A. The sodium valence electron is transferred to the chlorine atom. B. Ionic bonds are formed, with electrons completely transferred from the metal to the non - metal. 4. A. Coval…
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name roberto garza jr period 6 110125 naming compound and balancing equ…
# Explicación: ## Paso 1: Balancear la ecuación 2 Comenzamos con $C_3H_8 + O_2 ightarrow CO_2 + H_2O$. Primero, balanceamos los átomos de carbono. Hay 3 átomos de carbono en $C_3H…
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numeric 1 point determine the number of sig figs in the number below: 0…
2
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6. deux ballons de verre identiques ont été remplis à la même températu…
Le premier ballon (avec la diazote) a la pression la plus élevée car le nombre de moles de diazote est supérieur au nombre de moles de dioxyde de carbone dans les conditions de mê…
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39. a substance that has neither a definite shape nor definite volume c…
# Explanation: ## Step1: Recall states of matter properties Solids have definite shape and volume, liquids have definite volume but no definite shape, and gases have neither defin…
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a scientist finds an element and only knows that it is contained in gro…
The element should be handled carefully when exposed to water.
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calculate the density of the red mystery substance. instructions: 1. ma…
Mass = 41.1 g Volume = 25 mL Density = 1.644 g/mL
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what does the word culmination mean in the sentence, the discovery of t…
B. final product
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greenhouse gases include carbon dioxide and methane. how do greenhouse …
B. They trap heat that is radiated from the surface.
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a scientist who wanted to create a different arrangement of the periodi…
new elements have been discovered that show properties different than those predicted by the periodic table.
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activity a: bond polarity get the gizmo ready: • on the bond polarity t…
1A. The electrons are clustered more around the more electronegative atom. 1B. The atom with more electrons has a partial negative charge and the other has a partial positive char…
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39. a substance that has neither a definite shape nor definite volume c…
# Explanation: ## Step1: Recall states of matter properties Solids have definite shape and volume, liquids have definite volume but not definite shape, and gases have neither defi…
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which of these sentences from the text provides an argument that suppor…
Hefferlin’s chart reveals that certain properties of molecules—the distance between atoms and the energy required to ionize the molecule, for instance—occur in regular patterns.
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read about how the periodic table of elements was created and adapted b…
The periodic table of the elements we know today is the result of years of research by many different scientists. So the answer is: Years of research by many different scientists …
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do the following represent elements in a group, period, family or neith…
32. a. Group 33. b. Period 34. c. neither 35. a. Alkali metal 36. B. Halogen 37. c. Transition metal 38. solid
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bonds among water molecules covalent bonds hydrogen bonds polar bonds r…
hydrogen bonds
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25. in an atom the nucleus contains______. a. all the protons and neutr…
25. a. All the protons and neutrons 26. d. Subatomic particles 27. a. 0 28. b. 56 29. c. +1 30. a. Protons 31. c. 74.922 amu