Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which substance is the oxidizing agent in this reaction? fe₂o₃ + 3co→2f…
$Fe_2O_3$ $C_2H_5OH$
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which element is oxidized in this reaction? fe₂o₃ + 3co→2fe + 3co₂ ente…
Part A: C Part C: Cr
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carbon can have many different oxidation states in its compounds. what …
A. -4; +4 D. +7
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part a which reactant types give rise to gas - evolution reactions? dra…
Reactants that give rise to gas - evolution reactions: sulfides, ammonium, nitrates, bisulfites, acetates, bicarbonates, bisulfates Reactants that do not give rise to gas - evolut…
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you are given a solution of hcooh (formic acid) with an approximate con…
### Part A D. 36.2 mL ### Part B D. 0.1958 M
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the titration of 11.00 ml of hcl solution of unknown concentration requ…
$0.166$
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give examples. check all that apply. □ hcl(aq) + koh(aq) → kcl(aq) + h₂…
- Acid - base reaction examples: $\mathrm{HCl(aq)}+\mathrm{KOH(aq)} ightarrow\mathrm{KCl(aq)}+\mathrm{H_2O(l)}$, $\mathrm{H_2SO_4(aq)}+\mathrm{Zn(OH)_2(s)} ightarrow\mathrm{ZnSO_4…
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part b give examples. check all that apply. hcl(aq) + koh(aq) → kcl(aq)…
$\mathrm{HCl}(aq)+\mathrm{KOH}(aq) ightarrow\mathrm{KCl}(aq)+\mathrm{H}_{2}\mathrm{O}(l)$ $\mathrm{H}_{2}\mathrm{SO}_{4}(aq)+\mathrm{Zn}(\mathrm{OH})_{2}(s) ightarrow\mathrm{ZnSO}…
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what is an acid - base reaction? match the items in the left column to …
When an acid and base are mixed, the $H^+$ from the acid combines with the $OH^-$ from the base to form $H_2O(l)$.
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if 17.5 ml of 0.800 m hcl solution are needed to neutralize 5.00 ml of …
2.8 M
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what is the net ionic equation of the reaction of mgso4 with pb(no3)2? …
$Pb^{2 +}(aq)+SO_4^{2 -}(aq) ightarrow PbSO_4(s)$
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in many chemical reactions of two or more compounds, ions are present i…
$Mg^{2 +}(aq)+2OH^{-}(aq) ightarrow Mg(OH)_2(s)$
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question 4 (1 point) enter the measurement of the water in the graduate…
44
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36. how many f orbitals can there be in an energy level? 37. how many e…
7 ### 43. What is the maximum number of electrons that can be present in an atom having three principal energy levels?
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what is the correct net ionic equation, including all coefficients, cha…
$Ba^{2 +}(aq)+2OH^{-}(aq)+2H^{+}(aq)+SO_{4}^{2 -}(aq) ightarrow BaSO_{4}(s)+2H_{2}O(l)$
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36. how many f orbitals can there be in an energy level? 37. how many e…
7
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part a when the following two solutions are mixed: k₂co₃(aq) + fe(no₃)₃…
Spectator ions: $K^+(aq), NO_3^-(aq)$ Ions that react: $Fe^{3+}(aq), CO_3^{2 -}(aq)$
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part a which of the ionic compounds shown below will be soluble in wate…
$Na_2SO_4$
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what mass of silver chloride can be produced from 1.81 l of a 0.182 m s…
Part A: Value: 47.2 Units: g Part B: Value: 0.109 Units: M
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question 2 why does the alcohol stay in a layer on top of the water? a …
B. alcohol is less dense
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2 multiple choice 4 points who introduced cavity embalming by the troca…
1. A. Samuel Rogers 2. C. Samuel Rogers 3. A. Airtight receptacles
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4 multiple choice 4 points which of the following was not a major influ…
4. A. Air tight receptacles 5. A. 1879 6. D. White
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16) find the matter terms in the wordsearch.
MATTER, SOLID, LIQUID, GAS, ATOM, MOLECULE, STATE, FORM
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choose the word that best completes the sentence. i need to find a ____…
friendly
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name the following ionic compounds. (contd) 4. agbr 5. cocl₂ 6. rb₂s 7.…
4. Silver bromide 5. Cobalt(II) chloride 6. Rubidium sulfide 7. Iron(II) sulfate 8. Sodium chlorate 9. Potassium acetate 10. Lead(II) sulfate 1. \(1\ Zn+1\ CuCl_2 ightarrow1\ ZnCl…
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2. lithium nitrate 3. cesium oxide 4. potassium phosphide 5. ammonium c…
1. Barium nitrate 2. Tin(IV) chloride 3. Ammonium hydroxide
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match the terminology with the correct symbol. a. δg b. eₐ c. h d. s 1.…
1. c. H 2. a. $\Delta G$ 3. b. $E_A$ 4. d. S
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write the correct formula for each molecular compound. 1. disulfur deca…
1. Molecular compound formulas: - disulfur decafluoride: $S_2F_{10}$ - dihydrogen monosulfide: $H_2S$ - nitrogen trihydride: $NH_3$ - phosphorus trichloride: $PCl_3$ 2. Molecular …
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this question has two parts. answer part a, and then answer part b. par…
Part A: 3. The speaker gains a feeling of happiness when summer makes the earth beautiful. Part B: 1. "She drove the sap and broke the bud, She set the crimson rose afire." (Lines…
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physical vs. chemical change quick check which of the following happens…
Atoms of one or more substances rearrange into a new substance.
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click to select the correct answers. click again to unselect answers. l…
B. $2H_2+ O_2 ightarrow2H_2O$ is a balanced equation. D. A physical change does follow the law of conservation of mass. E. A pencil breaking is an example of a physical change.
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how many valence electrons are in an atom of the element fluorine? (1 p…
C. seven
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read this excerpt from walt whitmans poem \i hear america singing\ from…
A. present a poem with a natural, conversational rhythm.
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10 which of the following describes a chemical reaction? a oxygen inter…
A. Oxygen interacts with iron to form rust
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8 in a chemical reaction, 4 grams of sodium must combine with how many …
B. 6 grams
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7 4 grams of hydrogen and 32 grams of oxygen will combine to form: a 36…
A. 36 grams of water
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6 when sodium and chlorine combine to form sodium chloride, sodium chlo…
C. Product
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5 sodium and chlorine combine to form sodium chloride, or table salt, s…
D. Reactants
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3 the law of conservation of mass says substances can neither be ______…
C. Created; destroyed
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2 what are the reactants in a chemical reaction? a the new substances t…
B. The substances that interact to form new substances
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from the periodic table, it can be determined that iron (fe) has an ato…
107 amu
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review the claim and the two pieces of evidence. chewing gum can improv…
Evidence B is stronger because it comes from a study with multiple participants, providing more objective and generalizable data compared to the anecdotal Evidence A which is base…
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consider this claim: chewing gum can improve our alertness and lower ou…
Evidence B
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porcelain originated in china around 2,000 years ago, but its productio…
The options are not fully visible, but based on the text content and the nature of the question, one would need to analyze how the under - lined sentence relates to the broader st…
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cora wants to draw a model of an atom for her project for the science f…
The model that has 2 blue spheres in the nucleus (protons), 4 red spheres in the nucleus (neutrons), and 2 green spheres in the electron - shell is the correct one. Without specif…
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read the rough - draft paragraph. (1) many people experience a sense of…
3
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match the terminology with the correct symbol. a. $delta g$ b. $e_a$ c.…
1. d. S 2. a. $\Delta G$ 3. b. $E_A$ 4. d. S
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pre - test (turn in on the due day of the test) must be handwritten use…
1. Label left - hand area as metals and shade right - hand elements as non - metals on periodic table. 2. Ionic 3. An atom or molecule with a net electrical charge due to electron…
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value: 1 match the terminology with the correct symbol a. enthalpy b. δ…
a. 4. H b. 2. Delta c. 1. Gibbs energy d. 3. S
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activity c: hydrolysis get the gizmo ready • select the hydrolysis tab.…
1. A. 3 B. 18 carbon atoms, 36 hydrogen atoms, 18 oxygen atoms C. Water ($H_2O$) 2. The oligosaccharide starts to break down into smaller sugar - units. 3. $C_{18}H_{32}O_{16}+2H_…
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the severe secondary osteoarthritis that follows aseptic necrosis of th…
collapse of underlying subchondral bone
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10. apply math models in a chemical compound, there are 3 parts zinc fo…
60 grams
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apollo spas services 179 hot tubs. if each hot tub needs 155 ml of muri…
$27.745$
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multiple choice 1 point when water freezes it_ uses the same amount of …
1. C. takes up more space 2. D. both income and food 3. C. the average speed of water molecules increases (goes faster)
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part 3b 9 marks choose 3 of 4 (lesson 3b) draw the following covalent b…
Draw the Lewis structures as described above for three of the four compounds ($PCl_3$, $SO_2$, $CBr_4$).
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frayer model the selected word. identify characteristics of the word. i…
Definition: Something dangerous or likely to cause harm. Characteristics: Potentially injurious to health or property. Examples: Toxic chemicals, wild - fire. Non - examples: Soft…
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determine the chemical formula of the covalent compounds listed below: …
1. $NI_3$ 2. $SO_3$ 3. $CO$ 4. $PCl_3$ 5. $SF_6$
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determine the name of the covalent compounds listed below: 1. n₂o 2. so…
1. Dinitrogen monoxide 2. Sulfur dioxide 3. Phosphorus pentachloride 4. Dinitrogen pentoxide 5. Carbon dioxide
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determine the chemical formula of the ionic compounds listed below with…
1. $Cu(OH)_2$ 2. $Fe(C_2H_3O_2)_3$ 3. $Co(ClO_2)_2$ 4. $Pt(ClO_3)_4$ 5. $Sn(SO_4)_2$
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determine the name of the ionic compounds listed below with both a tran…
1. lead(II) sulfite 2. iron(III) phosphate 3. nickel(II) nitrate 4. copper(II) hydroxide 5. gold(I) nitrate
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determine the chemical formula of the ionic compounds listed below with…
1. $Ba(NO_{3})_{2}$ 2. $Al(OH)_{3}$ 3. $Al_{2}(SO_{4})_{3}$ 4. $Mg_{3}(PO_{4})_{2}$ 5. $(NH_{4})_{2}SO_{4}$
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a chemist carefully measures the amount of heat needed to raise the tem…
$710\ J\cdot kg^{-1}\cdot K^{-1}$
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question 13 (10 points) which compound will give a positive result in a…
The third compound (the benzaldehyde derivative)
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electron configurations worksheet write the complete ground state elect…
1) $1s^{2}2s^{1}$ 2) $1s^{2}2s^{2}2p^{4}$ 3) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ 4) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}$ 5) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}…
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determine the name of the ionic compounds listed below with polyatomic …
1. Ammonium chloride 2. Sodium sulfate 3. Potassium phosphate 4. Potassium nitrate 5. Lithium hydroxide
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electron configurations worksheet write the complete ground - state ele…
1. Hydrogen ($H$): $1s^{1}$ 2. Oxygen ($O$): $1s^{2}2s^{2}2p^{4}$ 3. Calcium ($Ca$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ 4. Titanium ($Ti$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{…
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according to this stanza, what rhyme scheme does this poem follow? 1 po…
A. ABAB
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original sentence: oxygen was discovered in 1772 by the swedish chemist…
Oxygen was discovered in 1772 by the Swedish chemist, Carl Scheele, but he withheld the information until 2 years later when Joseph Priestly made the same discovery.
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determine the chemical formula of the ionic compounds listed below with…
1. MnO$_2$ 2. PbO 3. CoCl$_2$ 4. Fe$_2$S$_3$ 5. FeO
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determine the chemical formula of the ionic compounds listed below: 1. …
1. $Mg_3N_2$ 2. $CaO$ 3. $KI$ 4. $LiCl$ 5. $K_2S$
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determine the name of the ionic compounds listed below with transition …
1. Copper(I) fluoride 2. Copper(II) fluoride 3. Lead(II) iodide 4. Lead(IV) chloride 5. Nickel(II) oxide
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determine the chemical formula of the ionic compounds listed below: 1. …
1. $Mg_{3}N_{2}$ 2. $CaO$ 3. $KI$ 4. $LiCl$ 5. $K_{2}S$
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determine the name of the ionic compounds listed below: 1. na2s 2. al2o…
1. Sodium sulfide 2. Aluminum oxide 3. Potassium chloride 4. Magnesium oxide 5. Sodium bromide
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multiple - choice question what is the electronic configuration nitroge…
C. 1s²2s²2p³
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on a standard hazard sign, what color square displays special hazards? …
1. D. White 2. A. Yellow 3. A. Material Safety Data Sheet
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multiple - choice question which block on the periodic table has 6 colu…
P. Option Text
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multiple - choice question which principle states that electrons fill o…
C. Aufbau
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what is the hunds rule? two electrons in the same orbital must have opp…
Electrons will enter empty orbitals of the same energy level before pairing up in an orbital with an electron already present
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12 multiple - choice question which of the rules discussed in this less…
Pauli Exclusion principle
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14. what is the recipe to make 5000 ul of a 1:100 dilution? 15. what is…
Take 50 $\mu L$ of the stock solution and add 4950 $\mu L$ of diluent. ### Question 15
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atomic structure and valence electron practice the purpose of this assi…
| Isotopic Name | Element Symbol | Atomic # | Mass # | # Protons | # Neutrons | # Electrons | # Valence elec. | |---|---|---|---|---|---|---|---| | Helium - 4 | He | 2 | 4 | 2 | 2…
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atomic # 7 atomic mass 14 p = 7 n = 7 isotope name: nitrogen symbol n v…
5
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which of the following tools should be used to accurately measure large…
1. C. Graduated Cylinder 2. D. 1000 3. B. 120 ul
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in 1943, niels bohr described the atom as a planetary system with elect…
| Atomic # | Atomic Mass | P | N | Element | Symbol | Valence e# | |---|---|---|---|---|---|---| | 6 | 12 | 6 | 6 | Carbon | C | 4 | | 20 | 40 | 20 | 20 | Calcium | Ca | 2 | | 1 |…
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which of the following tools is a round bottom piece of glassware which…
1. B. Erlenmeyer Flask 2. B. 5000
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what are the two things that need to be done to a spectrometer prior to…
D. Set the correct wavelength and zero to a blank sample
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12. estimate the actual atomic mass of ²⁴mg. | isotope | mass (amu) | r…
$20.18$ amu
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question: describe what the graphs are showing. (graph a is showing...g…
Graph A is showing a non - spontaneous physical process (ball moving up a slope) and an endothermic chemical reaction progress graph where products have higher energy. Graph B is …
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body produced brain chemical called endorphins are most similar to drug…
B. Fentanyl
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question: based on the picture, define the following words. a. atom (an…
a. The smallest unit of matter that retains the properties of an element, consisting of a nucleus and electrons. b. A group of two or more atoms held together by chemical bonds. c…
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adam is doing work by lifting a bowling ball. which statement could be …
Energy is being transferred from his arm muscles to the ball.
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data analysis 1. determine the whole number mole ratio of the two react…
1. The whole - number mole ratio of $HCl$ to $NaOH$ is 1:1. 2. The balanced chemical equation is $HCl(aq)+NaOH(aq) ightarrow NaCl(aq)+H_2O(l)$. If the experimental mole - ratio is…
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5. obtain 20 ml of 1 m sodium hydroxide in a 100 ml beaker. 6. using a …
The temperature - change values in the table are calculated correctly based on the formula $\Delta T=T_{max}-T_{min}$. For the three cases in the table, the temperature changes ar…
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atoms in a solid state are disordered and cannot move freely; atoms in …
B. In chain melt, some potassium atoms exhibit liquid - like disorder but remain confined by a solid lattice, preventing the free three - dimensional movement of a fully liquid st…
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congratulations! you can now take the exam. a passing grade is 70% or h…
Rinse the eye under lukewarm water for at least 20 minutes.
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question 7 3 pts how are hydrogen bonds different from covalent bonds? …
Hydrogen bonds are weaker bonds that form from molecules that have a slight positive charge on one side and a slight negative charge on the other.
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which statement best explains why a carbon atom can bond easily with it…
Carbon has four free electrons in its outer shell that can form covalent bonds.
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this beryllium atom is a negative ion. it has 4 protons, 4 neutrons, an…
-2
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check your understanding... select the correct answer and click submit.…
C. Both of the above
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check your understanding... select the correct answer and click submit.…
Can create both physical and health risks