化學
化學反應、化學計量、分子結構與元素性質。
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energy changes you have seen a number of examples of energy changes. le…
| Example Description | Energy In | Energy Out | | ---- | ---- | ---- | | Blender | Electrical | Mechanical | | Solar Panel Powered Communications Satellite | Solar | Electrical, …
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chemistry: scientific notation part a: express each of the following in…
5200
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hemistry: scientific part a: express each of the 1. 5.2 x 10^3
5200
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bio - 201 topic 1: anatomy, physiology, homeostasis, and the chemistry …
do not contain carbon atoms, with a few exceptions.
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define valence electron and identify number of valence electrons in an …
Valence electrons are outer - shell electrons involved in chemical bonding. To find valence electrons in an element using the periodic table, for main - group elements, the group …
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bio-201 topic 1: anatomy, physiology, homeostasis, and the chemistry of…
concentration of hydrogen and hydroxyl ions in a solution.
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1. for the following molecules (a) give the number of π -bonds present …
(a) 3 (b) Resonance structures are drawn by showing the movement of π - electrons and lone pairs to distribute the negative charge. (It is difficult to draw here in text - based f…
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which of the structures below represents a fat?
The third structure
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question 5 (2 points) what is the theoretical yield in grams of hydroge…
0.162
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question 4 (2 points) which answer shows a balanced reaction for the fo…
$Na_2CO_3(aq)+2AgNO_3(aq) ightarrow Ag_2CO_3(s)+2NaNO_3(aq)$
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question 3 (2 points) how many atoms of hydrogen are in 1.255 grams of …
$1.884\times 10^{23}\ H$ atoms
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question 2 (2 points) when one mole of each reactant is mixed, which re…
E. LiOH
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question 1 (2 points) when balanced, what is the stoichiometric coeffic…
understood one
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when the following equation is balanced, what is the coefficient in fro…
1
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question 4 (2 points) when the following combustion equation is balance…
6
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question 3 (2 points) how many grams of o₂ (mm = 32.00 g/mol) are consu…
9.50
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question 2 (2 points) when the following equation is balanced, what is …
A. 3
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question 1 (2 points) balance the following equation and determine the …
$3\ mol\ NO_2/2\ mol\ HNO_3$
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the empirical formula of a compound of boron and hydrogen is bh₃. its m…
C. $B_2H_6$
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question 4 (2 points) what is the empirical formula for a compound cont…
D. \(NO_2\)
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question 3 (2 points) what is the % cl in the compound c₅h₁₀ocl₂? 45.14…
45.14 % Cl
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question 2 (2 points) how many grams of s are in 2.44 moles of s? the m…
78.2508
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question 1 (2 points) how many atoms of c are in 0.522 moles c? 6.02 x …
$3.14\times 10^{23}$ (corresponding to the second option)
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salt barium air orange juice with pulp platinum hot tea silicon salt wa…
Element: Barium, Platinum, Silicon Compound: Salt, Carbon monoxide Heterogeneous mixture: Orange juice with pulp, Soil Homogeneous mixture: Air, Hot tea, Salt water, Toluene
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the reactivity of iron with oxygen the color of aluminum wire the flamm…
Physical property: the color of aluminum wire, the luster of silver jewelry, the smell of ginger, the melting point of butter Chemical property: the reactivity of iron with oxygen…
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breaking aluminum foil slicing a mango carving plastic rusting of iron …
Physical change: tearing aluminum foil, slicing a mango, carving plastic, snow melting Chemical change: rusting of iron (Fe), burning paper, bleaching hair, frying a chicken
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classify each of the following as an element, compound, homogeneous mix…
Element: oxygen Compound: vitamin D, water Homogeneous mixture: maple syrup, salt water Heterogeneous mixture: fruit salad
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scenario#2: egg in vinegar sam places an egg in a cup of vinegar and no…
1. Does the type of liquid change how quickly the egg - shell dissolves? 2. Different liquids will dissolve the egg - shell at different rates. 3. Type of liquid 4. Rate at which …
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8. get fit®, power house®, and fitness frenzy® are competing gyms that …
a. Fitness Frenzy. The cost function $C(x)=15$ is a constant function, so its graph is a horizontal line as the cost does not depend on the number of visits $x$. b. None of them. …
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an uncharged atom of boron has an atomic number of 5 and an atomic mass…
6
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part a what is the atomic mass of an atom that has 6 protons, 6 neutron…
B. 12
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part a which particles are found in the nucleus of an atom? protons and…
protons and neutrons
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fluorines atomic number is 9 and its atomic mass is 19. how many neutro…
For the first question about fluorine: D. 10 For the second question about boron: A. 5
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what is the atomic number of an atom that has 6 protons, 6 neutrons, an…
Part A: B. 6 Part B: A. These atoms are isotopes
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which statement best describes a compound? a compound is a solution. a …
A compound contains two or more different elements in a fixed ratio.
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part b the unequal sharing of electrons by the polar covalent bonds of …
Oxygen atoms are slightly negative, hydrogen atoms are slightly positive.
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a single water molecule composed of one oxygen atom and two hydrogen at…
Electrons are shared unequally, with the oxygen pulling more than the hydrogens
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drag the vocabulary terms onto this concept map about the components of…
a. protons b. neutrons c. electrons d. +1 e. nucleus f. -1 g. atomic number h. mass number
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1. what is the first step in effective farm waste management? a. findin…
1. D. identifying and characterizing types of waste generated 2. A. animal waste 3. C. adequate space for the animals' size and behavior 4. D. Triple rinse and recycle them accord…
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complete the sentence with the pronoun that agrees with the word or wor…
her
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complete the sentence with the pronoun that agrees with the word or wor…
It
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select the word that means large. farmers can use science to improve th…
substantial
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discussion topic the subject of earth and space science is a vast topic…
A physicist might study physical forces and energy in Earth and space contexts, using mathematical models and physical laws. Data could include gravitational and electromagnetic m…
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question 31 1 pts which of the following atoms have the same electron c…
$Cl^{-}$, $P^{3 - }$, $S^{2 - }$, $K^{+}$, $Ca^{2 + }$
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question 30 1 pts metals tend to ________ electrons while nonmetals ten…
B. lose, gain
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question 28 1 pts which of the following is the shorthand configuration…
Question 28: [Kr] $5s^{2}4d^{10}5p^{2}$ Question 29: octet rule
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which of the following orbital diagrams violates hunds rule? a 1↓ 1↓ 1↓…
C
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match the letter for each orbital diagram with the corresponding elemen…
A. P B. Ne C. S D. O
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question 22 1 pts given that the number of groups in a given block corr…
s subshell: 2 p subshell: 6 d subshell: 10 f subshell: 14
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using the periodic table, trace a stepwise path from hydrogen to the el…
1. 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ 2. Ge
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using the periodic table to trace a stepwise path from hydrogen to the …
For N: 1s²2s²2p³ For Ti: 1s²2s²2p⁶3s²3p⁶4s²3d²
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question 17 1 pts the periodic table can be used to give the electron c…
1s²2s¹
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question 16 1 pts the periodic table shows the electron configuration f…
Group 1 - 2: s block Group 13 - 18: p block Group 3 - 12: d block Lanthanides and Actinides: f block
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question 15 1 pts the periodic table is organized according to the ener…
D. Aufbau principle
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question 14 1 pts each subshell has a particular number of orbitals ass…
s: 2 p: 6 d: 10 f: 14
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question 13 1 pts electrons can be found in orbitals and each subshell …
s: 1 p: 3 d: 5 f: 7
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question 12 1 pts each electron in an atom can be assigned a set of qua…
C. shell, subshell
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for each shell with a principle quantum number n, there are subshells. …
1. A. \(n\) 2. D. probabilities
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which of the following are transition metals? (pick all that apply) □ f…
Question 1: Fe, Hg, Zn, Co Question 2: electrons
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question 6 1 pts which of the following elements is in the same period …
Question 6: B. B Question 7: B. similar chemical properties
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question 4 1 pts fluorine has an atomic number of __________. 9 19.00 1…
Question 4: A. 9 Question 5: B. 25
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using the periodic table from the pre - reading (), pick the group numb…
Li: Group 1 Mg: Group 2 Br: Group 17 (or 7) Kr: Group 18 (or 8) B: Group 13 (or 3)
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what group do the following elements all belong to: f, cl, br, and i no…
Question 1: Halogens Question 2: He, Ne, Ar, Kr
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what should the handwritten notes include to demonstrate mastery? perso…
First question: D. A sufficient number of worked examples Second question: C. Through concisely annotated diagrams, schemes, and tables using the symbolic language of chemistry Th…
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question 9 1 pts are pictorial representations of the electron configur…
Question 9: A. Orbital diagrams Question 10: A. valence, core electrons
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question 7 1 pts the electronic configuration for the hydrogen atom is …
Question 7: D. $1s^1$ Question 8: A. True
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question 5 1 pts the arrangement of electrons in the orbitals of an ato…
Question 5: C. electron configuration Question 6: n: the principal quantum shell a letter (s, p, d, or f): the orbital type - the subshell (l) a superscript: the number of electro…
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each given subshell is associated with a particular length energy time …
First question: energy Second question: first
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question 1 1 pts the energy of atomic orbitals is a function of the pri…
Question 1: C. n Question 2: D. s, p, d, f
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there are a number of online periodic tables that you can use. one that…
Hydrogen (H): Nonmetal Sodium (Na): Alkali metal Calcium (Ca): Alkaline earth metal Copper (Cu): Transition metal Silicon (Si): Metalloid Carbon (C): Nonmetal Argon (Ar): Noble gas
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there are a number of online periodic tables that you can use. one that…
Sodium (Na): Alkali metal Calcium (Ca): Alkaline - earth metal Copper (Cu): Transition metal
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there are a number of online periodic tables that you can use. one that…
Hydrogen (H): Non - metal Sodium (Na): Metal Calcium (Ca): Metal Copper (Cu): Metal Silicon (Si): Metalloid Carbon (C): Non - metal Argon (Ar): Non - metal (noble gas)
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match each of the group numbers to the group name derived from their ch…
Group 1: Alkali metal Group 2: Alkaline earth metal Group 3 - 12: Transition metals Group 17: Halogens Group 18: Noble gases
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question 7 1 pts the periodic table can be color - coded to classify th…
Question 7: B. metals, metalloids, nonmetals Question 8: B. 1 - 2 and 13 - 18; 3 - 12
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the elements are arranged in seven horizontal rows, called - groups - c…
For the first question: periods For the second question: groups
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question 3 1 pts is widely credited with creating the first periodic ta…
Question 3: C. Dimitri Mendeleev Question 4: D. atomic number
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read the excerpt from \tools of the spymaster\. james jays invisible in…
James Jay's invisible ink system allowed Washington to read secret messages.
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question 1 1 pts early chemists recognized that various elements could …
Question 1: D. chemical behavior Question 2: B. Potassium (K), C. Lithium (Li), E. Sodium (Na)
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read the excerpt from \tools of the spymaster\. james jays invisible in…
D. James Jay created an invisible ink system that required two chemicals.
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how should concepts be presented in the handwritten notes? in lengthy p…
For the first question: Through concisely annotated diagrams, schemes, and tables using the symbolic language of chemistry For the second question: Regularly to review comments an…
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question 1 what is the correct definition of force? slowing down moving…
Question 1: a push or a pull Question 2: chemical force
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question 1 what is the correct definition of force? slowing down moving…
Question 1: pushing or pulling Question 2: chemical force
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question 19 an atom has an average atomic mass of about 63.5 amu. what …
C. Cu
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indium (in) is made up of 95.7% 115 in and 4.3% 113 in. the atomic mass…
114.818 amu
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question 15 what is the most massive part of an atom? protons area outs…
Question 15: C. nucleus Question 16: D. one neutron
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question 13 1 pts an atom has a charge of -3 in its orbitals. which sta…
Question 13: There are three positively charged protons in the nucleus Question 14: the nucleus
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what is the number of protons plus the number of neutrons in the nucleu…
1. B. mass number 2. D. protons and neutrons
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question 9 1 pts orbitals are defined by which term? composition energy…
Question 9: energy level Question 10: atomic number
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an electrically neutral atom has the electron configuration 1s²2s²2p⁶3s…
Question 1: A. sulfur Question 2: B. \(1s^{2}2s^{2}2p^{4}\)
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which subshell can have a maximum of 2 electrons? o s o d o f o p quest…
Question 5: A. s Question 6: A. 10
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question 3 what may happen to the electron when it gains energy? it may…
Question 3: It may move to a higher energy level. Question 4: the orbital model of the atom
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question 1 1 pts according to bohrs model of the atom, in which orbital…
Question 1: innermost orbitals Question 2: in the outermost electron shell
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fill in the blanks. ____________ is a carrier protein that ____________…
D. Albumin; non - polar (lipid soluble)
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where art thou, muse, that thou forgetst so long to speak of that which…
The rhyme scheme is abab cdcd efef gg. The regular rhyme scheme makes the sonnet sound musical and memorable.
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explain how is the modern periodic table different from mendeleev’s per…
The modern periodic table arranges elements by atomic number instead of atomic mass like Mendeleev's. It has more elements and a more standardized group - numbering system.
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4. synthesize information the noble gases in group 18 were some of the …
Noble gases are inert with full - valence shells, present in low atmospheric concentrations, and do not react easily, thus were among the last to be discovered.
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use figure 4 to answer question 3. 3. interpret tables what element is …
The element is chromium (Cr). It is more similar to tungsten because elements in the same group of the periodic table have similar chemical properties, and chromium and tungsten a…
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2. construct explanations assume that one particular atom of rhodium (r…
The atomic mass on the periodic table is a weighted - average of all isotopes of rhodium, while 102 is likely the mass of a single isotope.
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state the appropriate disposal route of the following: used organic sol…
used organic solvents: 3. hazardous waste through science stores very diluted acid: 4. down the sink remnants from lunch: 6. garbage container outside the lab used batteries: 1. s…
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question 15 (1 point) saved considerations for working under a chemical…
- Ensure chemical containers are stored at the back of the fumehood - Work at least six inches inside the fumehood - Declutter the fumehood to create a safe working space