化学
化学反応、化学量論、分子構造、元素の性質。
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lucas created the model below to represent a neutral lithium (li) atom …
Lucas should remove 1 electron from the model.
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a scientist has two beakers. the list below describes the contents of e…
B. Beaker 1 contains a compound, and Beaker 2 contains a mixture.
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which model illustrates the law of conservation of mass?
D. Model D
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maxwell fills a balloon with helium gas. later, he accidentally pops th…
C. The balloon experienced physical changes when it was filled with helium and when popped.
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unit 5 test bonding name place the letter of your answer in the blank. …
1. b 2. c 3. a 4. c 5. c 6. b 7. a 8. a 9. c 10. d 11. c 12. a
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which element has properties most similar to calcium (ca)? a potassium …
B. magnesium (Mg)
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sarah wants to draw a diagram of an iron (fe) atom. the atom she intend…
A. 26 protons and 30 neutrons
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ammonia gas is a pure substance. each molecule of the substance consist…
A. Ammonia gas is a compound.
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the first ionization energy, e, of a boron atom is 8.01 x 10² kj/mol. w…
\(149\text{ nm}\)
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ethanol is a chemical that is used in many hand sanitizers. it is produ…
- For H: 24 - For C: 8 - For O: 4 - Molecules of ethanol: 4
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sulfuryl chloride is a substance used to make chemicals for killing ins…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | \(O\) | \(6\) | | \(S\) | \(3\) | | \(Cl\) | \(6\) | The number of molecules of \(SO_{2}Cl_{2}\) that reac…
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question 5.a b. the molecules gain kinetic energy and move faster. c. t…
- **Question 5.a**: B. The molecules gain kinetic energy and move faster. - **Question 5.b**: D. The molecules collide more frequently and spread farther apart.
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question 5.a a student heats a container of liquid and observes the beh…
B. The molecules gain kinetic energy and move faster.
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during an emergency lift system test, engineers monitor the hydraulic f…
C. Higher temperatures increase the kinetic energy of the fluid molecules, reducing viscosity and improving the efficiency of the lift's hydraulic system.
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students are tasked with developing a model to predict how temperature …
D. Rising temperatures increase the kinetic energy of concrete molecules, which can lead to cracking as the material expands.
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a class conducts an experiment with a hot air balloon, observing how he…
B. The kinetic energy of the air molecules increases, leading to more collisions and decreased density, allowing the balloon to rise.
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as a pot of water boils on the stove, the temperature increase causes t…
A. The heightened kinetic energy causes the water molecules to move more rapidly, allowing the water to transition from liquid to gas.
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question 5 1 pts according to the balanced chemical equation from the p…
Lead (II) nitrate
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question 3 1 pts what type of reaction is the following: ( mathrm{pb}(m…
Question 3: B. Double Replacement Question 4: C. \(2KNO_3\ (aq)+PbI_2\ (s)\)
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question 1 1 pts what is the chemical formula for lead (ii) nitrate? pb…
Pb\((NO_3)_2\) # Question 2
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metals nonmetals metalloids questions: 1. how can elements be classifie…
1. Elements can be classified as metals, nonmetals, or metalloids. 2. Metals are good conductors of heat and electricity. 3. Malleable means they can be hammered into sheets. 4. D…
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a brainwave pattern is caused by the chemical signals sent between the …
F
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fever when he was 22. click to listen to this part of the poem read alo…
EEFF
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37 multiple choice 2 points glucose has a specific rotation of +52.8°. …
B. 0.299 g/mL
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i must go down to the seas again, to the lonely sea and the sky, and al…
The speaker has a strong affection (or love, longing) for the sea.
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35 multiple answer 2 points which of the following statements describe …
A. The departed leaving group should have low basicity. D. The leaving group should be highly polarizable.
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34 multiple choice 2 points which of the following best approximates th…
120°
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which type of energy is stored energy? potential mechanical kinetic che…
- First question: potential - Second question: potential energy because it still has a distance to move before it hits the ground and kinetic energy because it is moving
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multiple choice 2 points the boiling point of s - 2 - butanol is 99°c. …
99°C
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which type of energy is rotating fan blades? mechanical energy potentia…
- First question: mechanical energy - Second question: kinetic
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which phrase is the correct definition of energy? chemical change force…
- Question 1: the ability to do work - Question 2: chemical energy
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28 multiple choice 2 points use the iupac rules to write the name of th…
A. 2,5-dimethylhexa-2,4-diene
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multiple choice 2 points in the reaction $\\ce{ch_{3}br + oh^{-}->ch_{3…
OH⁻
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26 multiple answer 2 points which of the following mechanisms (s_n1, s_…
A. E1, B. \( S_N1 \)
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23 multiple choice 2 points what is the typical final product of an add…
B. An alkane, due to the addition of atoms across the double bond.
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22 multiple answer 2 points which of the following describe characteris…
B. They differ in the arrangement of groups around a double bond. C. They are a type of stereoisomerism found in alkenes.
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the unit of mass used for atoms: * moa - mass of atom uam - unit of ato…
amu - atomic mass unit ### Second Question:
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which of the following is true when discussing the structure of the ato…
- First question: The nucleus is very small and tightly/densely packed with protons and neutrons. - Second question: protons and neutrons. - Third question: protons have a positiv…
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multiple choice 2 points determine the compounds iupac name. 3 - bromo …
6-bromo-2,3-dimethyloct-2-ene
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18 multiple choice 2 points provide the proper iupac name for the alken…
A. (E)-3,5-dimethylhex-2-ene
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16 multiple choice 2 points which of the following alkenes has the smal…
C. 2,3-dimethyl-2-butene
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15 multiple choice 2 points what is an addition reaction in organic che…
C. A reaction where elements are added to a molecule, typically involving the conversion of a pi bond to two sigma bonds.
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14 multiple choice 2 points how many vinylic and allylic hydrogens are …
5 vinylic, 4 allylic
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13 multiple choice 2 points name the haloalkane using r or s descriptio…
(S)- 1 - chloro - 3,3 - dimethylcyclohexane
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multiple choice 2 points predict the major product of the reaction show…
2,3-dimethyl-2-butene
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11 multiple choice 2 points name the compound shown below. 3 - propylcy…
3 - propylcyclopenta - 1,3 - diene
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multiple choice 2 points name the following compounds systematically. (…
A. (i): 1 - methylcycloocta - 1,4,6 - triene (ii): 3 - bromo - 4 - methylcyclopent - 1 - ene
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multiple answer 2 points which of the following statements correctly de…
- Rate = k[RX] - reactions occur in more than one step.
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you see a faint mist hovering above a work area. could this be a visual…
Yes
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you see a liquid seeping out of a container. could this be a visual sig…
Yes
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7 multiple answer 2 points which of the following reagents can be used …
B. HBr in the presence of peroxides (ROOR) D. BH₃ followed by H₂O₂, NaOH
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multiple choice 2 points dehydrohalogenation of an alkyl halide by trea…
E2
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are chemical hazards always visible? select the best option. yes no if …
No
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multiple choice 2 points how many elements of unsaturation do molecules…
0
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multiple answer 2 points which of the following statements is (are) tru…
B. This compound is a diastereomer of (3R,4S)-3,4 - dimethylhexane., C. The enantiomer of this compound is (3S,4S)-3,4 - dimethylhexane., D. This compound is chiral.
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exercise 4. provide the name for each compound cucn feo zno al₂o₃ agcl …
Ammonium nitrate, Calcium nitrite, Iron(II) chromate
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glaciers erode land through which two processes? o chemical weathering …
plucking and abrasion
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pregunta 2. en la clase de química del sr. maia, dos estudiantes, alana…
Gallium (Ga)/Galio (Ga)
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pre - lab questions answer the following questions after you have read …
The new pressure is \(0.374\ atm\).
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the sensation of is created when the of air molecules travels through t…
The first blank: sound. The second blank: vibration. The third blank: waves.
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essay: explain how methane (ch₄) and ethane (c₂h₆) demonstrate the law …
Methane (\(CH_4\)) and ethane (\(C_2H_6\)) demonstrate the law of definite composition as their atomic ratios ( \(C:H = 1:4\) for \(CH_4\) and \(C:H= 1:3\) for \(C_2H_6\)) are fix…
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a 1,128 how many ounces are in 4 pints? b 64 a recipe calls for 40 ounc…
A. 1128, B. 64, C. 1.5, D. 72, E. 1000, F. 25, G. 120, H. 2.5
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if the statement is true, write true in the blank. if it is false, ital…
1. false, number of solute particles 2. true 3. false, increases 4. true 5. false, lower 6. true
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question 7 0.5 pts chemicals that the placenta isnt able to screen out …
True
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select the correct answer. the painting school of athens by raphael use…
A. Some objects in the painting appear to be close, while others seem to be far away
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use your previous drawing the answer the following questions. click all…
(a) Hydrogen bonds, London dispersion forces (b) Covalent bonds, London dispersion forces (c) none
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use your previous drawing the answer the following questions. click all…
(a) Covalent bonds, London dispersion forces (b) Covalent bonds, London dispersion forces (c) none
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unit 3 practice #2 26. the diagram above represents a solution of ions …
B. \(0.1\ M\ KI(aq)\) because \(KI\) completely dissociates in water to produce ions.
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25. beaker x and beaker y each contain 1.0 l of solution, as shown abov…
D. \(2.0\ M\ AgNO_{3}\), \(1.0\ M\ MgCl_{2}\), \(0.50\ M\ Mg(NO_{3})_{2}\) and \(AgCl(s)\)
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unit 3 practice #2 21. an ionic crystal is added to water and starts to…
B. The particle is negatively charged, because hydrogen atoms in water are attracted to it.
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a student placed a sample of a food coloring that contains a mixture of…
B. The dyes will pass through the column at a slower rate because \(CH_3OH(l)\) is a less polar solvent than water.
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16. a student performed a fractional distillation of a mixture of two s…
C. C
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ap unit 3 practice #2 15. based on the results of the paper chromatogra…
C. It has a weaker attraction for the stationary phase that it has for the mobile phase.
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unit 3 practice #2 13. ethyl acetate butyl acetate a mixture containing…
B. Ethyl acetate, because it has a shorter carbon chain and weaker London dispersion forces
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gases generated in a chemical reaction are sometimes collected by the d…
A. \(H_2\)
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unit 3 practice #2 1. based on the structural formulas, which of the fo…
D. Propanol, because its molecules can form hydrogen bonds with water molecules but those of ethane cannot. # 2.
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match the following to the correct answer. energy in motion choose choo…
- Energy in motion: Kinetic Energy - Energy found in food and batteries: Chemical Energy - States that energy cannot be created or destroyed: Law of conservation of energy - Heat …
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identify the 4 different types of energy transfers that are occurring i…
chemical, mechanical, electrical and thermal
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question 19 which nursing intervention would the nurse implement when p…
Having them avoid contact with infected persons.
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question 18 1 pts energy in motion is _________ energy. potential chemi…
Kinetic
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energy and waves - test 10/23 started: nov 4 at 9:54pm quiz instruction…
Kinetic/Thermal
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for thousands of years, humans have been eating fermented foods, or foo…
- Undergoes fermentation, or special chemical changes: Sour cream (✔), Yogurt (✔) - Frequently used in Middle Eastern dishes: Sour cream (✖), Yogurt (✔) - High in protein: Sour cr…
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6. 5.00 g of each reactant are used. determine the theoretical yield of…
\(1.46\ g\) \(NH_3\)
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what volume (ml) of 2.50 m hcl(aq) is needed to react 2.00 g iron? (ans…
\(28.6\space mL\)
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use the text to compare and contrast bases and acids. an acid is define…
- Have a pH less than 7.0: Check the acid column. - Taste sour: Check the acid column. - Are usually solids: Check the base column. - Change litmus paper to red: Check the acid co…
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3d printing material groups use the information below to answer the que…
patina
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a worker mixed chemicals that caused a release of toxic gas. in the pas…
Inspect the workplace to assess how this happened.
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which statement best compares the carbon cycle and the nitrogen cycle? …
Both involve the work of decomposers.
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which term does \smokeless tobacco\ refer to? select all that apply. on…
A. A substitute for cigarettes, D. Tobacco products with carcinogenic chemicals, E. Tobacco products placed in the mouth but not ignited
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look at the text below. if there is an error with subject - verb agreem…
Fish and young corals can discern healthy reefs from fragile ones. Each of these creatures is able to detect chemical signals that help determine whether a reef is flourishing.
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so, if each of these little yellow legos is supposed to represent a mon…
B. Polymer
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how many π bonds are present in the structure of ibuprofen shown?
4
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how many π bonds are in the structure of the organic molecule below? re…
4
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how many π bonds are in the structure of the organic molecule below?
3
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2. which of these can happen during a chemical reaction that produces n…
Both the absorption and release of energy depending on the type of reaction
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ccc patterns electron affinity and ionization energy appear to be oppos…
Electron affinity and ionization energy share similar periodic trends because both are influenced by atomic radius. In a period, decreasing atomic radius leads to higher electron …
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the has a negative charge. the is smaller than the other particles and …
Electron, Electron, Nucleus, Proton, Neutron, Electron, Positive, Protons, Neutrons
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ccc patterns when asked why a chlorine atom gains one electron to form …
The statement is generally true. Chlorine gains an electron to achieve a noble - gas (argon - like) electron configuration, which is stable due to a full outer energy level.
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ccc patterns compare the trends for atomic size and first ionization en…
Atomic size and first ionization energy trends are inversely related. Down a group, larger atoms have lower first ionization energy (electrons less tightly held). Across a period,…
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2. based on the type of elements involved, predict whether each of the …
Sodium chloride (NaCl): ionic Copper (II) sulfate ($CuSO_4$): ionic Potassium chloride (KCl): ionic Magnesium sulfate ($MgSO_4$): ionic Sucrose ($C_6H_{12}O_6$): not ionic