Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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reading a graduated cylinder multiple - choice question what reading do…
4.23 ml (assuming the closest option to the correct reading of 4.2 mL among the given choices)
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multiple - choice question what reading? 32.8 ml 31.2 ml 30.0 ml
30.0 mL
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7. what is the constant of proportionality in the equation y = 5x? 8. w…
5 ### 8.
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6. consider a solution of hcn. list all of the aqueous species in this …
$[HCN]\approx4.05\times10^{-2}\ M$, $[H^{+}]\approx5.01\times10^{-6}\ M$, $[CN^{-}]\approx5.01\times10^{-6}\ M$, $[OH^{-}]\approx1.996\times10^{-9}\ M$
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a chemical manufacturer wants to lease a fleet of 26 railroad tank cars…
B. There are multiple possible combinations of how the tank cars should be leased. The combinations are obtained from the equations $x_1 = 2t-34$, $x_2=60 - 3t$, and $x_3=t$ for $…
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consider the reaction when aqueous solutions of lead(ii) nitrate and ni…
$Pb^{2 +}(aq)+2Cl^{-}(aq) ightarrow PbCl_2(s)$
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practice: balancing equation show all work on a separate sheet of paper…
1. $2H_2+O_2 ightarrow 2H_2O$ 2. $H_3PO_4 + 3KOH ightarrow K_3PO_4+3H_2O$ 3. $6K + B_2O_3 ightarrow 3K_2O+2B$ 4. $HCl + NaOH ightarrow NaCl + H_2O$ 5. $10Na + 2NaNO_3 ightarrow 6N…
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write a balanced equation for the double - replacement precipitation re…
$CuCl_2(aq)+2KOH(aq) ightarrow Cu(OH)_2(s) + 2KCl(aq)$
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does a reaction occur when aqueous solutions of potassium carbonate and…
Yes $2Al^{3 +}(aq)+3CO_3^{2 -}(aq) ightarrow Al_2(CO_3)_3(s)$
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practice: balancing equations #1 show all work on a separate sheet of p…
5. $10Na+2NaNO_3 ightarrow 6Na_2O + N_2$ 6. $4C+S_8 ightarrow 4CS_2$ 7. $2Na + O_2 ightarrow Na_2O_2$ 8. $2N_2 + 5O_2 ightarrow 2N_2O_5$ 9. $2H_3PO_4+3Mg(OH)_2 ightarrow Mg_3(PO_4…
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1. what is the mass number for a neon atom with 15 neutrons? what would…
1. Mass number: 25, Atom's full name: neon - 25 2. Approximately 75 amu 3. $\bar{M}=\sum_{i = 1}^{n}M_i\times \%Ab_i$ 4. 63.55 amu 5. 85.56 amu 6. 238.0 amu 7. 47.92 amu 8. It is …
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write the net ionic equation for the precipitation reaction that occurs…
$Fe^{3 + }(aq)+3OH^-(aq) ightarrow Fe(OH)_3(s)$
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what is the elisa test used for? a test to confirm mononucleosis b trea…
For the first question: C. screens blood for presence of human immunodeficiency virus (HIV) antibodies For the second question: C. mononucleosis
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part 1 (1 point) see periodic table part 1 part 1: re - draw the first …
(It is not possible to directly draw in this text - based format. But the steps above describe how to re - draw the cyclohexane in chair - conformation. One would draw a standard …
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5. the density of ethanol is 0.789 g/ml at 20°c. find the mass of a sam…
$118.35\ g$
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select the statement(s) that are true about carbon. carbon dioxide abso…
- Carbon atoms are essential to all life on Earth. - The ocean stores more carbon than the atmosphere.
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4. find the volume that 35.2 g of carbon tetrachloride (ccl₄) will occu…
22 mL
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the university of manitoba, term test 1 chem 1110 a01, version a octobe…
c) \(CH_3CH_2CH_2OH\)
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question 20 the central region of an atom is called the ____. proton el…
C. nucleus
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chemistry: density problems for each problem below, write the equation …
1. Mass of Ag: $10132.5\ g$ 2. Density of the substance: $11\ g/cm^{3}$ 3. Volume of $O_2$: $186567.16\ mL$ 4. Volume of $CCl_4$: $22\ mL$
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question 4 the smallest particle of an element that still retains all t…
B. atom
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a student records a measurement as 0.0700 g. how many significant figur…
3 significant figures: 7, 0, and 0
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prepwork part 2: electron configuration directions: read the passage be…
1. $1s^{2}2s^{2}$ 2. Magnesium
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a chemical reaction for the reaction of sodium hydroxide (naoh) and hyd…
There seems to be an issue with the problem setup as the stoichiometric and non - stoichiometric mass - balance approaches give different results. If we assume a simple mass - bal…
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which observation best indicates that a chemical change has occurred? a…
C. Bubbles form when vinegar is added to baking soda.
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this balanced chemical equation demonstrates the law of conservation of…
C (carbon) - 6, O (oxygen) - 18, H (hydrogen) - 12
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this balanced chemical equation demonstrates the law of conservation of…
C (carbon): 6 O (oxygen): 18 H (hydrogen): 12
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periodic table scavenger hunt! prework part 1: periodic table practice …
1. Gold (Au) 2. Magnesium (Mg) 3. Neon (Ne) 4. Lithium (Li) 5. Bromine (Br), Mercury (Hg) 6. Silicon (Si) 7. # of protons: 49, # of electrons: 52 8. Hydrogen (H) 9. Calcium (Ca) 1…
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ca(oh)₂ + co₂ → caco₃ + h₂o. this balanced chemical equation demonstrat…
C (Carbon): 1 O (Oxygen): 4 H (Hydrogen): 2 Ca (Calcium): 1
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a chemical reaction for the reaction of aluminum + hydrochloric acid is…
38 g
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a chemical reaction for the reaction of calcium hydroxide and carbon di…
20 g
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in a chemical reaction, two clear solutions are mixed in a sealed beake…
C. It will stay the same because matter is conserved
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chemistry: density problems for each problem below, write the equation …
$10132.5\ g$
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what is the definition of \sonnet\? a poem written in praise of ones lo…
B. a 14 - line poem that follows a particular rhyme scheme
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chemistry: density problems for each problem below, write the equation …
$10132.5\ g$ 2.
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which reaction is exothermic? ch4 + 2o2 → co2 + 2h2o + 891 kj nh4no3 + …
CH₄ + 2O₂ → CO₂ + 2H₂O + 891 kJ
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which statement about exothermic reactions is accurate? as reactants fo…
As reactants form products, the potential energy decreases.
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a hot metal plate at 150°c has been placed in air at room temperature. …
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
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in what type of reaction or process does heat flow into the system? com…
D. endothermic
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3. use tables in chapter 16 to determine which side of the following eq…
a. The right - hand side is favored. b. The right - hand side is favored. c. The right - hand side is favored.
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which event is endothermic? the burning of a match the change of water …
the melting of ice
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a student touches a freshly baked cake that was taken out of the oven. …
The molecules in the cake are moving faster than molecules in the skin.
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a baseball player hits a ball. which is the best description of the ene…
B. kinetic
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how should the baking of a pizza be categorized? as an exothermic proce…
as an endothermic process because the dough absorbs heat
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which reaction is endothermic? hcl + naoh → nacl + h₂o + 58 kj 6co₂ + 1…
6CO₂ + 12H₂O + energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
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a welding torch produces a flame by burning acetylene fuel in the prese…
A. chemical energy into thermal energy
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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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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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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) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}…
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determine the name of the ionic compounds listed below with polyatomic …
1. Ammonium chloride 2. Sodium sulfate 3. Potassium phosphate 4. Potassium nitrate 5. Lithium hydroxide
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according to this stanza, what rhyme scheme does this poem follow? 1 po…
A. ABAB
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original sentence: oxygen was discovered in 1772 by the swedish chemist…
Oxygen was discovered in 1772 by the Swedish chemist, Carl Scheele, but he withheld the information until 2 years later when Joseph Priestly made the same discovery.
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determine the chemical formula of the ionic compounds listed below with…
1. MnO$_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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what is the name for the subunit which proteins are made out of? * 1 po…
1. A. Amino Acids 2. B. Keep the ethanol away from open flames 3. C. Immediately rinse of your eyes with emergency eye wash station
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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