化学
化学反应、化学计量、分子结构与元素性质。
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evaluate match each subfield of psychology with the issues or questions…
1. c. Cognitive psychology 2. d. Developmental psychology 3. b. Experimental psychology 4. a. Behavioral neuroscience 5. e. Personality psychology 6. d. Developmental psychology 7…
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at the boiling - point, the density of the liquid is 809 g/l and that o…
$5.59\ L$
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element symbol words use the listed atomic numbers to find the element …
1. Algebra 2. Amuse 3. Bonus 4. Clock 5. Conjure 6. Dynamite 7. Fraction 8. Lady 9. Money 10. Montana 11. Mousse 12. Phone 13. Raccoon 14. Tickle - B 15. Watch
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after reading lesson 1.2, answer the following questions. why study che…
1. a. Understand matter and its changes. b. Design new materials. c. Develop new drugs. 2. Pharmacist Chemical engineer Forensic scientist 3. The application of scientific knowled…
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practice it mental framework for understanding or acting on the environ…
D. schema
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question 3 of 25 what is the complete ionic equation for the reaction b…
A. \(2Na^{+}(aq)+SO_{4}^{2 - }(aq)+Ca^{2+}(aq)+2Cl^{-}(aq)\to CaSO_{4}(s)+2Na^{+}(aq)+2Cl^{-}(aq)\)
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big ideas in chemistry 5. another name for a \big idea\ is 6. what are …
5. Theme 6. c. Matter and its properties d. Energy changes e. Atomic structure f. Molecular structure g. Chemical bonding h. States of matter
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5. a reaction between sodium borate and acetic acid is a neutralization…
b) It is not possible to detect the point when the reaction is completed, and you should stop adding vinegar (if you follow the procedure as it is written in this handout).
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question 27 of 30 what is the oxidation state of n in nano₃? a. -1 b. 0…
D. +5
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question 26 of 30 how are all compounds similar? a. they are all made u…
A. They are all made up of atoms of two or more different elements.
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question 25 of 30 what is the cathode in an electrochemical cell? a. th…
B. The electrode where reduction occurs
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question 24 of 30 which reaction occurs at the cathode of a galvanic ce…
C. $\ce{Cu^{2+}(aq) + 2e^{-}\to Cu(s)}$
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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question 23 of 30 the half - reaction at the cathode in an electrochemi…
C. $Zn(s)\to Zn^{2+}(aq)+2e^{-}$
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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practice it process of incorporating new objects or situations into exi…
B. assimilation
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question 22 of 30 which statement best describes how energy is importan…
A. Energy is absorbed and released during chemical reactions.
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when you _______, you make a plan or a plot. it may take you longer to …
scheme; scheme
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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question 21 of 30 which would most likely be reduced when combined with…
A. Ni
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question 20 of 30 what allows electrons to flow between electrodes in a…
B. Conducting wire
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question 19 of 30 how can scientists model the effects of reactant conc…
A. With a computer model
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question 1 - 16 scientists once believed that all headaches were caused…
Repeated studies provided scientists with new evidence.
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1. energy of moving electrons or electric charges 2. energy of light 3.…
2. Radiant 3. Thermal 4. Sound 5. Chemical 6. Nuclear 10. Chemical
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after reading lesson 1.1, answer the following questions. what is chemi…
1. Matter is anything that has mass and takes up space. 2. Chemistry is the scientific study of the properties, composition, structure, and reactions of matter.
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read and answer the questions to assess your prior knowledge of the con…
1. C. Solid 2. B. take the shapes of their containers 3. D. atoms, which are too small to be seen and have energy. 4. A. is greater than the energy of atoms in solids but less tha…
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éléments chimiques symbolo radium krypton chlore calcium lithium bore o…
Radium : Ra Krypton : Kr Chlore : Cl Calcium : Ca Lithium : Li Bore : B Oxygène : O Hélium : He Sodium : Na Magnésium : Mg
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which of the following permits are for businesses who comply with regul…
Environmental permit
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question 30 of 30 a liquid changes color as it cools and becomes solid.…
D. Identifying the solid and liquid as the same substance would confirm that a physical change took place.
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in this simulation, you will be exploring the relationship between temp…
1. When the temperature is raised from 300 K to 400 K (while keeping volume constant), the pressure increased. The initial pressure range is 5.4 - 6.2 atm and the pressure range w…
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reading evaluation 1. which definition best matches the meaning of elev…
1. C. The action of being elevated 2. C. barometer 3. D. mass 4. B. "At higher elevations, decreased atmospheric pressure is being exerted on the surface of the water, and the mol…
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in this simulation, you will be exploring the relationship between temp…
When the temperature is raised to 400 K, the pressure range is $7.5 - 8.3\ atm$. When the temperature is decreased to 200 K, the pressure range is $3.5 - 4.3\ atm$. For the gas - …
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question 14 of 30 a structural model of retinol is shown below. how man…
B. 20
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in this simulation, you will be exploring the relationship between temp…
1. As the temperature is increased from 300 K to 400 K, the pressure increases. As the temperature is decreased from 400 K to 200 K, the pressure decreases. 2. When the temperatur…
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bicyclo _._._ __________
bicyclo [3.1.1] azasulfane
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missed this? watch kcv: atomic theory; read section 2.3. you can click …
191.0 kg
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cholesterol is important in nutrition because: it is found in most food…
- Question 29: it is necessary for the production of the emulsifier bile by the liver. - Question 30: True - Question 31: True
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missed this? watch kcv: atomic theory, read section 2.3. you can click …
13.9, 8.78
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part 1: types of mixtures 1. define mixture: 2. circle the correct answ…
1. A combination of two or more substances that are not chemically combined. 2. Saltwater: homogeneous; Salad: heterogeneous 3. Air: homogeneous, components uniformly distributed;…
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a ball - and - stick model of a molecule. all matter is made of atoms. …
B. Ball - and - stick models help show the structure of matter.
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question 10 of 30 what is the balanced form of the chemical equation sh…
C. \( \mathrm{C}_{6}\mathrm{H}_{12}\mathrm{O}_{6}(s)+6\mathrm{O}_{2}(g)\to6\mathrm{H}_{2}\mathrm{O}(l) + 6\mathrm{CO}_{2}(g) \)
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vitamin d is only obtained from sunlight. true false question 9 (0.5 po…
Question 8: B. False Question 9: A. True Question 10: B. Aid in digestion
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question 5 (0.5 points) what is the key difference between vitamins and…
C. Vitamins are organic molecules, while minerals are inorganic molecules
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write the chemical symbol below for each atom. 6. 19 p, 21 n, 19 e 7. 1…
6. K 7. K⁺ 8. Br 9. Br⁻ 10. Br⁻
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multiple - choice question why did the carbon dioxide turn to a solid? …
it gave away enough energy to go through deposition (change of state from gas to a solid)
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lab safety quiz a beaker of a chemical is accidentally knocked off a la…
C. Immediately notify the teacher and allow the teacher to assist the student with the safety shower.
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name: q1 chemistry: u1l5 mixture separation teacher: date: uncommon sch…
1. Oil; because it is immiscible and has lower density; decantation. 2. Separate sand; filtration. 3. Evaporation. 4. Distillation or chromatography. 5. Condense water vapor from …
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protons, neutrons & electrons of atoms directions: use the periodic tab…
1. Protones (+1), neutrones (0), electrones (-1). 2. Protones y neutrones. 3. Número de protones, número atómico y número de electrones (en átomos neutros). 4. Sí, por ejemplo arg…
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which of the following is/are the most significant resonance structure(…
B. II
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which of the following is/are the most significant resonance structure(…
B. II
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question 8 of 32 which element has a lower first ionization energy than…
D. Sodium (Na)
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the change when a liquid takes in energy and turns to a gas is called e…
evaporation / vaporization
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which of the following is/are the most significant resonance structure(…
A. I
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if the liquid particles receive enough energy then they can escape, whi…
gas
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if the liquid particles receive enough energy then they can escape, whi…
None of the above options are correct as the liquid turns into a gas when particles receive enough energy.
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which of the following is/are the correct resonance structure(s) for bo…
D. only A and C
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are the electron movements shown legal? i ii a. yes yes b. yes no c. no…
B. yes, no
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question 7 of 32 which statement best describes the polarity of the mol…
D. It is polar, because the bond polarities add together in a bent molecule.
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are the electron movements shown legal? i ii a. yes yes b. yes no c. no…
B. yes, no
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question 6 of 32 which element has 2 valence electrons in the 2s sublev…
C. Be
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question 5 of 32 what is the formula for strontium oxide? a. sr₂o₂ b. s…
C. SrO
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question 4 of 32 what is the name of the compound with the formula lino…
C. Lithium nitrate
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question 3 of 32 what is the electron configuration for vanadium (v)? t…
B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{3}$
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question 2 of 32 what is the formula for tin(iv) sulfide? a. sns b. sn4…
C. SnS₂
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question 1 of 32 which sublevel contains valence electrons in an atom o…
D. 3s
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question 23 of 25 who made the first periodic table of the elements? a.…
B. Dmitri Mendeleev
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question 22 of 25 hands moving on a battery - operated clock is an exam…
D. Chemical potential energy being converted to kinetic energy
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what is another name for group 8a? a. group 18a b. group 8 c. group 8b …
D. Group 18
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question 20 of 25 why do elements within a period of the periodic table…
A. They have different numbers of valence electrons.
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question 16 of 25 which family contains elements with a full octet of v…
B. The noble gases
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question 15 of 25 fireworks contain metals that are brightly colored wh…
B. Mg
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question 13 of 25 calcium (ca) has an atomic number of 20. it can form …
A. 2+
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question 12 of 25 how are the elements arranged in the current periodic…
C. In order of increasing atomic number
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7 ccc systems and system models liquid gallium changes to a gas at 2229…
In the model of gaseous gallium, the particles would be much farther apart and moving more freely in all directions compared to the particles in the model of liquid gallium, which…
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which of the following is the correct condensed structure for the follo…
B. $CH_3CHOH(CH_2)_2CHClCH_3$
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question 10 of 25 what are the noble gases? a. elements with seven vale…
D. Elements with two or eight valence electrons
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question 9 of 25 which option describes a phase change? a. plasma erupt…
D. Gasoline evaporating into the air
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question 8 of 25 which element contains the same number of valence elec…
D. Si
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what is the formal charge on the nitrogen in the following compound? as…
B. 0
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5 sep construct an explanation density is the mass of matter in a given…
Ice floats on water because the open hexagonal - lattice structure of ice molecules due to hydrogen - bonding makes ice less dense than liquid water.
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water forms drops because water molecules are attracted to one another.…
A. Water molecules are polar, meaning they have weak charges at each end. B. The attraction between water molecules forms surface tension. C. The positive end of one water molecul…
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question 6 of 25 which of the following is the energy of motion? a. kin…
A. Kinetic energy
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drag and drop words into the blanks to complete the prompt. the hydroge…
First blank: covalent Second blank: polar Third blank: hydrogen
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sep develop models use colored pencils to draw models for a chlorine mo…
Draw a model of a chlorine molecule ($Cl_2$) and a hydrogen - chloride molecule ($HCl$) using colored pencils with colors and relative sizes as per the atom key on the previous pa…
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sep develop models use colored pencils to draw models for a chlorine mo…
Use colored pencils to draw a chlorine molecule ($Cl_2$) and a hydrogen chloride molecule ($HCl$) according to the colors and relative sizes from the atom key on the previous page.
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which of the following is the correct representation of partial charges…
D. I = $\delta^-$; II = $\delta^-$; III = $\delta^+$
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question 4 of 25 which element is in the lanthanide family? a. silver (…
B. Promethium (Pm)
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question 3 of 25 what is the mass number of neon (ne)? a. 10 b. 20 c. 1…
B. 20
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question 2 of 25 which characteristic gives the most information about …
C. The atomic number
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question 1 of 25 an atom of aluminum (al) has an atomic number of 13 an…
B. 14
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spheres as models scientists often use spheres with different colors an…
Marbles are macroscopic and do not represent sub - atomic particles or chemical behavior of atoms.
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determine the formal charges for the indicated atoms, as drawn. i ii a.…
C. +1, 0
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what is the hybridization of the indicated atoms? a. i: sp², ii: sp² b.…
B. $sp^{2}$, $sp^{3}$
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what is the hybridization of the indicated atoms? i ii n≡ n nh oh o i i…
D. sp, $sp^{3}$
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choose the correct molecular formulas for the given bond - line formula…
B. $C_6H_{10}$, $C_{10}H_{15}N$
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a beaker contains 15.23 ml of water. 6.7 ml of the water is measured an…
$8.5$ mL
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snc2p chemistry unit questions: true or false name: if the answer is tr…
1. False, Making an observation 2. True 3. False, Control group 4. True 6. D 7. E 8. G 9. A 10. B 11. H 12. C 13. F
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zoe is a chemistry teacher earning a salary of $38,000 per year. she al…
a. I
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question which of the following could be considered a physical change? …
chopping firewood
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the diagram below shows the structure of an alloy composed of two unkno…
D. Ni and C