化學
化學反應、化學計量、分子結構與元素性質。
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current attempt in progress using the information in the following tabl…
(a) 391.15 K (b) 244.4 °F
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current attempt in progress using the information in the following tabl…
$118.0^{\circ}C$
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the sweet slice pie shop sells organic pies with locally - sourced ingr…
$\frac{2}{3}$
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in what physical state does chlorine exist at -65 °c? table 4.1 | physi…
Liquid
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in what physical state does chlorine exist at -65 °c? table 4.1 | physi…
Gas
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b. what is the molar concentration of this substance when its absorbanc…
b. $1.4\times10^{-3}$ c. $2.5$ 11. It would double.
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3. a solid compound of a group 1 (alkali) metal and a group 17 (halogen…
C. The particle is a positive ion, and the interactions are ion - dipole attractions.
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question 7 20 pts a student was performing a spectrophotometric analysi…
y - axis title: Absorbance (unit - less, 3 sig figs) x - axis title: Molar Concentration ($mol/L$, 2 sig figs)
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multiple choice question which is the bright red molecule formed when h…
B. Oxyhemoglobin
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question 9 b. what is the molar concentration of this substance when it…
(No answer can be provided without the graph from Question 7)
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what is the best title for the graph given to you in the previous quest…
Standard Curve of a Colored Compound at Its Maximum Absorbance
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a student was performing a spectrophotometric analysis of a colored com…
y - axis title: Absorbance y - axis units: None (dimensionless) y - axis number of sig figs: 3 x - axis title: Molar Concentration x - axis units: M (molar) x - axis number of sig…
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what is the primary purpose of a mass spectrometer? to measure temperat…
To identify unknown substances
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what does the electron - dot notation show? only the protons in an atom…
Only the valence electrons in an atom
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read the sentences. the scientist used a chronometer to accurately trac…
B. instrument for measuring time
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read the sentences. the scientist used a chronometer to accurately trac…
B. instrument for measuring time
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question 9 (1 point) which of the following is the electron configurati…
D. $1s^{2}2s^{2}2p^{4}$
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a halogens b transition metals c metalloids d actinides
B. transition metals
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which of the following best describes atoms? atoms are made of uniform …
Atoms are made of three particles called electrons, neutrons, and protons.
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question 8 quiz 4: biology m6 lesson 1 neutrons and protons nucleus pos…
1. neutrons and protons - nucleus 2. positively charged particle in an atom's nucleus - proton 3. two or more atoms of the same element having different numbers of neutrons - isot…
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question 8 quiz 4: biology m6 lesson 1 negatively charged particle that…
1. Electron 2. Element 3. Atom 4. Nucleus 5. Proton 6. Isotopes
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which of the following is the noble gas notation for sodium? a he 2s^1 …
B. [Ne] 3s¹
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question 1 (1 point) which of the following is the noble gas configurat…
C. [He] 2s²
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two atoms with the same number of protons but a different number of neu…
Isotopes
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the positively charged center of an atom is called the select choice el…
nucleus
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which of the following is not found in the nucleus of an atom? neutron …
B. electron
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9. what are some other uses for baking soda in the home? list three.
1. Cleaning agent: It can be used to clean kitchen appliances, sinks, and countertops. Mix it with water to form a paste for scrubbing. 2. De - odorizer: Place an open box in the …
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topic sentence: in my personal utopia, society would place great import…
B. Fresh fruits and vegetables would be sold at affordable prices. C. Time would be set aside each morning for an hour of exercise.
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select all the items from the answer bank that are influenced by an enz…
activation energy ($E_A$), speed of the reaction
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two atoms of uranium that differ in their number of neutrons are called
isotopes
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elements are placed into the same group on the periodic table of the el…
B. have similar chemical properties
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matter :elements and compounds chemistry honors slide 21: what are the …
Slide 21: The elements present and the number of atoms of each element. Slide 22a: Colored or differently - sized spheres. Slide 22b: Varies based on the compound. Slide 22c: A co…
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jackies uncle is undergoing radioactive iodine treatments for thyroid c…
atoms of the same element with a different number of neutrons
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7. are granulated sugar and powdered sugar the same thing? explain. 8. …
7. No. Granulated sugar has larger crystals and powdered sugar may have anti - caking agents like cornstarch. 8. No. Baking powder is a mixture with baking soda as one component a…
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matter: elements and compounds chemistry honors slide 21: what are the …
Slide 21: Elements present and relative number of atoms. Slide 22 a): Colored or differently - sized spheres. Slide 22 b): Varies based on the model. Slide 22 c): Compound has ato…
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separating mixtures - fill in the blanks complete the following sentenc…
a. filtración b. filtración c. cristalización d. destilación e. cromatografía f. destilación
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an empty water bottle is covered with black paper. a deflated balloon i…
A. Radiation heated the bottle. The bottle transferred heat energy to air molecules by conduction. Air molecules moved throughout the system to inflate the balloon through convect…
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what is radiation? oa transfer of heat through space ob transfer of hea…
A. transfer of heat through space
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what would happen to a fully inflated balloon if you placed it in the r…
C. It would get smaller in size because the air molecules slow down and get closer together as the balloon cools.
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the lewis structure for the iodate ion, io3-, which is favored by the o…
3, 0, 10
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ddt, an insecticide harmful to fish, birds, and humans, is produced by …
a. 1176.12 g b. $C_2HOCl_3$ is limiting; $2C_6H_5Cl$ is in excess c. 438.11 g d. 17.09%
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which is not the correct chemical formula for the compound named? ○ nit…
sodium carbonate, $NaHCO_3$
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what is the formal charge on oxygen in the lewis structure shown below …
0
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the correct name for hclo₃ is _____. ○ chlorous acid ○ hydrogen trioxyc…
chloric acid
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crushing an aluminum can is classified as a chemical change. true false
False
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which of the following molecules include a central atom that does not o…
II and III only
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the mass of an object is an intensive property. true false
False
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the terms decompose, explode, rust, and ferment they all refer to chemi…
True
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aluminum combining with oxygen to form aluminum oxide is a chemical cha…
True
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match the following vocabulary words with the appropriate definition: s…
- solid: forma de materia que tiene su propia forma y volumen definidos - liquid: forma de materia que fluye, tiene un volumen constante y adopta la forma del contenedor - gas: fo…
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water freezing and forming ice is a chemical change. true false
False
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another name for a chemical change is a ____________. physical change c…
C. chemical reaction
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which statement correctly explains how the existence of isotopes affect…
The molar mass (the mass in grams of one mole) for an element is a weighted average because it accounts for the mass and natural abundance of all the element's isotopes
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the lewis structure for the ion, hco₂⁻, should show ______ single bond(…
C. 2, 1, 5
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9) what is the value of n in the equation 1.9×10^7=(1×10^5)(1.9×10^n)? …
For the first question, \(n = 2\). For the second question: a. 1 significant digit. b. \(1.59\times10^{-18}\) gram. For the third question: \(-2.4\times10^{-6}\)
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which of the following ionic compounds is incorrectly named? ca3(po4)2,…
E. $PbO_2$, lead(II) oxide
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a phase change is always a physical change. true false
True
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which of the following ionic compounds is incorrectly named? ca3(po4)2,…
$\ce{PbO2}$, lead(II) oxide is incorrectly named. The correct name should be lead(IV) oxide.
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which of the following statements best explains the purpose of the mole…
To establish a direct relationship between the mass of a substance (in grams) and the actual number of particles (atoms, molecules, or ions) it contains.
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what is the formal charge on the cl atom in the perchlorate ion, clo4-,…
- 1
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what is the formal charge on the cl atom in the perchlorate ion, clo4-,…
+ 3
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which of the lewis structures given below is the best structure for ocl…
The structure $\ddot{Cl}-\ddot{O}-\ddot{Cl}$ (the second structure in the image) is the best Lewis structure for $OCl_2$.
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in which of the following species does the central atom violate the oct…
C. $SF_4$
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slide 6: what is the difference between an element and a compound? elem…
Element - A pure substance made of only one type of atom, cannot be broken down chemically. Compound - A pure substance made of two or more different types of atoms chemically com…
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9) what is the value of n in the equation 1.9×10^7=(1×10^5)(1.9×10^n)? …
$n = 2$ ### 11.
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14. secondary colors are colors that result from mixing two... primary …
14. True 15. Three shades, tones, and tints of a base color 16. True 17. False 18. True 19. Line 20. True
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7. which element of art can be used to create the illusion of depth in …
7. Form 8. Blue 9. Yellow and green 10. alarm and anger 11. color harmony 12. Color wheel 13. True
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identify if the following is an ion, isotope, or neither? * na ion isot…
Neither/Neutral
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co₂, carbon dioxide on the right). what is one difference you notice wi…
For the difference in combination of atoms/elements: In $H_2O$, hydrogen and oxygen combine in a 2:1 ratio of $H$ to $O$, while in $CO_2$, carbon and oxygen combine in a 1:2 ratio…
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model 2 - emission spectra for hydrogen and boron atoms 7. use colored …
7. (This requires physical coloring and cannot be done in text - based response. But the general idea is to color according to the visible - light color - wavelength associations.…
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slide 4:two examples (visual models) of compounds are given ( water - h…
For the difference in terms of combination of atoms/elements: One possible difference is that $CO_2$ contains carbon which may not be present in the compound in slide 2. For $H_2O…
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is the image of the molecule below depicting a monomer or polymer? ques…
monomer
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calcium slide 4:two examples (visual models) of compounds are given ( w…
$H_2O$: 2 types of colored spheres $CO_2$: 2 types of colored spheres Element: Made of only one type of atom Compound: Made of two or more different types of elements chemically c…
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1. what is the mass number for a neon atom with 15 neutrons? what would…
1. Mass number: 25, Full name: neon - 25 2. Approximately 75 amu 3. $\bar{M}=\sum_{i = 1}^{n}M_i\times\%_{i}$ 4. 63.55 amu 5. 85.56 amu 6. 238.0 amu 7. 47.92 amu 8. Due to presenc…
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balance the chemical reaction of photosynthesis 6co₂ + 6h₂o + light ene…
$6CO_2 + 6H_2O+\text{Light Energy} ightarrow C_6H_{12}O_6 + 6O_2$
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explain the difference of neutral atom, ions, and isotopes?
A neutral atom is electrically neutral due to equal protons and electrons. Ions are charged due to electron gain or loss. Isotopes of an element vary in neutron - number and atomi…
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part 3b 9 marks choose 3 of 4 (lesson 3b) draw the following covalent b…
For PCl3: P is in the center with 3 single bonds to Cl and 1 lone pair on P. For SO2: S is in the center with a double bond to one O, a single bond to the other O, and 1 lone pair…
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q. 16. what is the correct electron - configuration for titanium? 1s² 2…
1s²2s²2p⁶3s²3p⁶4s²3d² or [Ar]4s²3d²
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total bond energy quick check which result occurs during an exothermic …
Light or heat are released into the environment.
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classify as a physical property or a chemical property a. fe and o₂ for…
a. Propiedad química b. Propiedad física c. Propiedad química d. Propiedad física e. Propiedad física
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question 12 (1 point) which of the following chemical reactions does no…
B. $C_6H_{12}O_6 + O_2 ightarrow CO_2+H_2O$
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total bond energy quick check which result occurs during an exothermic …
Light or heat are released into the environment.
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which statement explains why duluth will likely experience less change …
a. The heat capacity of water is high
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a. label the metals and the nonmetals. b. for the vertical arrow, indic…
A. Metals are on the left - hand side of the periodic table representation in the grid, non - metals on the right. B. Atomic radius: Increases; Ionization energy: Decreases; Elect…
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total bond energy quick check which event is an example of an endotherm…
photosynthesis
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total bond energy quick check how is total reaction energy calculated? …
reactant bond energy - product bond energy
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question 3 (1 point) which statement is true? a the element carbon is o…
B. The atom carbon is one element in a molecule of $C_6H_{12}O_6$
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when producing hydrogen iodide, the energy of the reactants is 581 kj/m…
9 kJ/mol, endothermic
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total bond energy quick check hydrogen bromide breaks down into diatomi…
- 102 kJ/mol, exothermic
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investigate: select groups. the periodic table is divided into metals a…
A. Properties like high electrical and thermal conductivity, malleability, ductility. B. Properties like being poor conductors, forming negative ions. A. Group 1 (alkali metals) B…
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introduction: the periodic table is so named because similar patterns r…
1. Largest atoms: Lower left region; Smallest atoms: Upper right region; Highest ionization energy: Upper right region; Lowest ionization energy: Lower left region; Highest electr…
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question 1 (1 point) saved which of the following is an example of a mo…
A. HCl (hydrochloric acid)
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directions: using your computer, tablet or mobile device, navigate to t…
1. 18 2. 7 3. a. Palladium (Pd) b. Arsenic (As) c. Calcium (Ca) d. Magnesium (Mg) e. Radon (Rn) f. Francium (Fr) 4. Metal 5. Right side 6. 6; Lithium (Li), Sodium (Na), Potassium …
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7. circle only the quantitative physical properties (measurable ones) f…
Weight, Melting Point, Boiling Point
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a pure substance is: composed of only one type of atom or molecule. com…
composed of only one type of atom or molecule.
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical formula | Name of compound | | ---- | ---- | ---- | ---- | | $Ca^{2+}$ | $BrO_{3}^{-}$ | $Ca(BrO_{3})_{2}$ | Calcium bromate | | $NH_{4}^{+}$ | $CrO_{…
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fill in the systematic names of the following chemical compounds. note:…
| molecular formula | name of compound | | ---- | ---- | | $SeS_2$ | selenium disulfide | | $Se_4S_4$ | tetraselenium tetrasulfide | | $XeF_6$ | xenon hexafluoride | | $XeO_3$ | x…
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instructions: choose an answer and hit next. you will receive your scor…
mass
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note: to answer some of the questions, it may help to reference a perio…
B. alpha radiation
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having problems staying logged in or are you experiencing issues? pleas…
Selenium (Se)