化学
化学反应、化学计量、分子结构与元素性质。
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in the periodic table, elements in groups 1a through 8a (also known as …
A valence electron is an electron in the highest occupied energy level of an atom. The group number (1A - 8A) directly gives the number of valence electrons (e.g., Group 1A: 1 val…
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which of these is a chemical property used to identify minerals? a. col…
B. Reactivity
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directions: for each of the following, write the letter of the term or …
2. b. electromagnetic spectrum 3. a. electrons 4. b. radio waves 5. d. ultraviolet waves 6. d. microwaves 7. a. infrared waves 8. b. visible light
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question 1 of 10 which type of energy causes hot water to erupt from a …
D. Geothermal energy
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animal milk is a natural source of the disaccharide lactose. the monosa…
All the four statements are true. 1. Sucrose and lactose have the same chemical formula. 2. The monosaccharides in sucrose are fructose and glucose. 3. The monosaccharides in lact…
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what is the orbital notation for as?
The orbital notation for As is: \(1s\): \(\uparrow\downarrow\) \(2s\): \(\uparrow\downarrow\) \(2p\): \(\uparrow\downarrow\) \(\uparrow\downarrow\) \(\uparrow\downarrow\) \(3s\): …
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draw the bohr model for si
A nucleus with 14 protons (labeled as 14). Three electron - shells: the innermost (K) shell has 2 electrons, the middle (L) shell has 8 electrons, and the outermost (M) shell has …
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what is the orbital notation for p?
The orbital notation for phosphorus (P) is: \(1s\): \(↑↓\) \(2s\): \(↑↓\) \(2p\): \(↑↓\) \(↑↓\) \(↑↓\) \(3s\): \(↑↓\) \(3p\): \(↑\) \(↑\) \(↑\)
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what is the electron configuration of c?
\(1s^{2}2s^{2}2p^{2}\)
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draw the lewis dot structure for na.
Na•
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what is the electron configuration of cs?
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}\)
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measuring temperature change when using a calorimeter, the initial temp…
The final temperature of the metal: \(29.8^{\circ}C\) The temperature change of the water: \(6.2^{\circ}C\) The temperature change of the metal: \(-40.6^{\circ}C\)
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monosaccharides are the building blocks of carbohydrates. they may be f…
- has 12 hydrogen and 6 oxygen atoms: glucose (check), fructose (check), galactose (check) - is a monosaccharide: glucose (check), fructose (check), galactose (check) - has a 6 - …
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carbohydrates are also known as saccharides. the word saccharide is a t…
\(C_6H_{12}O_6\)
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water can travel up a glass tube against the force of gravity! this is …
Cohesive forces between water molecules hold the molecules together. Adhesive forces cause water molecules to stick to the glass molecules in the tube. When adhesive forces are gr…
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water is made of one oxygen atom covalently bonded to two hydrogen atom…
In a molecule of water, each hydrogen atom shares a pair of electrons with the oxygen atom. Oxygen also has two nonbonding pairs of valence electrons. Because valence electrons ar…
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adhesive forces between water molecules and glass molecules help water …
- Third statement: Water rises farther in a narrow glass tube than in a wide glass tube. - Fourth statement: Water molecules are held together by hydrogen bonds as they rise in a …
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a scoop - shaped concave meniscus forms when adhesive forces between a …
- Oil: Adhesive and cohesive forces are equal. - Water: Adhesive forces are greater than cohesive forces. - Mercury: Cohesive forces are greater than adhesive forces.
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water molecules are also attracted to other kinds of molecules. this is…
A concave meniscus forms in a glass column when **adhesive** forces between water and glass are **greater** than **cohesive** forces between water molecules.
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determine whether each statement is true or false. molecules at the sur…
1. False 2. True 3. False 4. True 5. True
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water can form drops on a surface, like on a leaf. drops form because w…
A. A water molecule can form hydrogen bonds with several other water molecules. C. The cohesive forces between water molecules are hydrogen bonds. D. Cohesion is an attractive for…
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polar water molecules form hydrogen bonds with each other. in liquid wa…
A slightly $\boldsymbol{\delta^-}$ (negative) oxygen atom in a water molecule forms a $\boldsymbol{\text{hydrogen}}$ bond with a slightly $\boldsymbol{\delta^+}$ (positive) hydrog…
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4. vibrating molecules in the air are called a. light waves b. sound wa…
b. Sound waves
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usage pointed to the pesticide as a cost-effective means of controlling…
introduced something or brought it about
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what are the roles of the fcc in the us? fcc- federal communications co…
- regulating the country’s communications infrastructure - ensuring communication technology is compatible with existing technology - assigning frequencies to television, radio, c…
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poetry and drama unit test let me not to the marriage of true minds adm…
abab
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use the lines to answer the question. what is the rhyme scheme of these…
B. \(ABAB\)
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what is the aesthetic impact of a poem? (1 point) how the poem affects …
how the poem affects the reader’s senses
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structure of poetry quick check what is rhyme scheme? (1 point) ○ a set…
the ordered pattern of rhymes at the ends of lines of a poem
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the pmi for remains of a body enclosed in a plastic bag could best be e…
blowfly maggot counts
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students are testing two chemical reactions to see whether they release…
Reaction 1 releases thermal energy and Reaction 2 absorbs thermal energy.
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which of the following has a major role regulating global temperatures?…
oceanic currents
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the nurse is assisting in the care of a group of clients on the nursing…
2. Client with an ischemic stroke
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olivia runs a home - based business that distributes high - quality, ha…
- First question: multi - level marketing - Second question: pyramid schemes
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of \(e\)) | approximate mass (amu) | location on diagram | | ---- | ---- | ---- | ---- | ---- | | proton | \(p^{+}\) | \(+1\) | \(1.0\) | \(…
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multiple select question select all that apply which are examples of io…
- In \(MgCl_2\), a magnesium atom loses two electrons while two chlorine atoms gain one electron each. - Sodium ions, \(Na^+\), and bromine ions, \(Br^-\), are attracted in a \(1:…
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count the significant digits in each of these measurements: measurement…
| measurement | number of significant digits | |--|--| | \(4.2\times 10^{-3}\text{ mL}\) | \(2\) | | \(13300.\text{ kg}\) | \(5\) | | \(0.004200\text{ J}\) | \(4\) | | \(-4.0\time…
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write the chemical symbols for three different atoms or atomic anions w…
\(Kr\), \(Br^-\), \(Se^{2 -}\)
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for every 6 molecules of carbon dioxide gas (co₂) and 6 molecules of wa…
| Type of atom | Number of atoms in 1 molecule of glucose | Number of atoms in 6 molecules of oxygen | Total number of atoms in products | |---|---|---|---| | \(H\) | 12 | 0 | 12 …
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multiple select question select all that apply which factors affect the…
charge of nucleus, size of atom
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select the text from the paragraph that best helps you understand that …
occasionally a major discovery happens in a more fortuitous way
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this question has multiple parts. work all the parts to get the most po…
The middle illustration (the second one among the original three snapshots) is the first to represent an equilibrium mixture.
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choose the correct definitions for k, k_p, and q (select all that apply…
- \(Q\) is called the reaction quotient. \(Q\) has the exact same form as \(K\) or \(K_p\), but instead of equilibrium concentrations, initial concentrations are used to calculate…
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select all that apply q is equilibrium constant as determined by the la…
- \(Q\) is equilibrium constant as determined by the law of mass action. For \(Q\), concentration units of \(mol/L\) are used. - \(Q\) is called the reaction quotient. \(Q\) has t…
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view this video according to piaget, the two major processes by which s…
First question: assimilation and accommodation. Second question: Rose: concrete operational, George: preoperational.
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consider the following unbalanced reaction: p4(s) + f2(g) → pf3(g) what…
\(82.9\ g\)
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kinetic energy transfer quick check when thermal energy is applied to w…
When the water reaches \(100^{\circ}C\), any increase in thermal energy goes to breaking the bonds between water molecules as the water boils and becomes steam.
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consider the following unbalanced reaction: p_{4}(s)+f_{2}(g) ightarrow…
$88.6$
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which of the following solutions of strong electrolytes contains the la…
\(150.0\space mL\) of \(0.60\space M\space AlCl_3\)
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what is a substance with a ph of exactly 7 considered to be? alkaline o…
neutral
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calculate the concentration of all ions present in each of the followin…
a. \(M_{Ca^{2+}} = 1.00\space M\), \(M_{NO_3^-}=2.00\space M\) b. \(M_{Na^{+}} = 5.6\space M\), \(M_{SO_4^{2-}}=2.8\space M\) c. \(M_{NH_4^{+}}\approx0.0651\space M\), \(M_{Cl^-}\…
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a 230 - ml sample of a 0.295 m cacl₂ solution is left on a hot plate ov…
\(207\space mL\)
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for part a, complete and balance the equations below. if a reaction did…
1. \(Na_3PO_4(aq)+3AgNO_3(aq) ightarrow 3NaNO_3(aq)+Ag_3PO_4(s)\) 2. \(Na_3PO_4(aq)+Cr(NO_3)_3(aq) ightarrow 3NaNO_3(aq)+CrPO_4(s)\) 3. \(3Na_3PO_4(aq)+2Pb(NO_3)_2(aq) ightarrow 6…
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question 37 (q014) abraham is at a bar with some friends when he sees a…
- Question 37: d. maintenance rehearsal - Question 38: a. retrograde amnesia - Question 39: a. schemas - Question 40: d. retroactive interference
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question 29 (q010) carol seems to remember every detail about every con…
- Question 29: D. episodic - Question 30: C. working memory - Question 31: A. anterograde amnesia - Question 32: B. chunking
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which statements accurately describe the sonnets rhyme scheme and its e…
A. The rhyme scheme is \(abab\ cdcd\ efef\ gg\). E. The regular rhyme scheme makes the sonnet sound musical and memorable.
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where art thou, muse, that thou forgetst so long to speak of that which…
three quatrains and one couplet, lines of poetry with five metrical feet, unstressed and stressed syllable groups
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question 25 (q008) todd put a tiny light on one spoke of each of his bi…
- **Question 25**: a. sensory storage - **Question 26**: b. the recency effect - **Question 27**: b. semantic - **Question 28**: c. a longer delay between when participants saw th…
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for each of the quantities listed below, explain which of the following…
(a) temperature of the gas sample (b) number density of the gas sample, size of the molecule, temperature of the gas sample (c) mass of the molecule, number density of the gas sam…
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how many periods of elements does the periodic table contain? _________.
7
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2. how many periods of elements does the periodic table contain? ______…
7
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match each rhyme scheme to the correct portion of the sonnet cdcd gg ab…
- cdcd → second quatrain - gg → couplet - abab → first quatrain - efef → third quatrain
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section iii: closed constructed response and critical thinking: read ea…
Noble gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn). The noble gas with the smallest mass is helium (He).
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11. complete the equation in the table below. number of neutrons =_____…
Number of neutrons = mass number - number of protons
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day 2 1. covalent bond is between a and 2. ionic bond is between a and …
1. non - metal; non - metal 2. metal; non - metal 3. metal; metal 4. covalent; non - metal; non - metal 5. ionic; metal; non - metal
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12. every atom of a given element has the same number of __________ and…
protons; (neutral - state) electrons
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6. is the following sentence true or false? two atoms of the same eleme…
False
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10. what is the mass number of an atom?
The mass number of an atom is the sum of the number of protons and neutrons in its nucleus.
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9. is the following sentence true or false? two different elements can …
False
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8. circle the letters that identify quantities that are always equal to…
b. number of protons, d. number of electrons
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16. is the following sentence true or false? isotopes of oxygen have di…
False
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17. water that contains hydrogen - 2 atoms instead of hydrogen - 1 atom…
Heavy water
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15. all oxygen atoms have 8 protons. circle the letter of the number of…
C. 10
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10. twenty - one ounces of water evaporated from seventy - five ounces …
a. The amount of salt is \(26.25\) ounces. b. The salt concentration in the remaining solution is approximately \(48.61\%\)
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the combined gas law (pages 80 - 81) 14. circle the letters of the fact…
a. temperature, c. volume, d. pressure
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13. boyles law states that there is an inverse relationship between the…
A. \(P_1V_1 = P_2V_2\)
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draw the lewis structure of ch₃cch and then choose the appropriate set …
The Lewis structure of \(CH_3CCH\) is \(H - C - C\equiv C - H\) with the first \(C\) (connected to \(CH_3\)) being \(sp^3\) hybridized, the middle \(C\) (in the triple bond) being…
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naturally occurring chlorine that is put in pools is 75.53 percent 35cl…
$35.46$ amu
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a hybrid orbital set is shown below. how many unhybridized p - orbitals…
2
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in the 1970s, what element was removed as an additive from gasoline? zi…
lead
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when are parts per million and parts per billion used as measurements? …
when measuring concentrations that are smaller than 1%
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chemical changes directions: follow the instructions to go through the …
1. Yes, new substances are being created. We know this because there are bubbles (indicating the formation of a gas, which is a new substance). 2. The mass would decrease. This is…
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which of the following forms an acid in the atmosphere? oxygen argon he…
nitrogen oxides
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the valence electrons of group 4a elements are in the 5s subshell. peri…
True: - The highest principal energy level of period 4 elements is 4. - The valence electrons of group 3A elements are in an s and p subshell. - Group 8A elements in the p - block…
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a lewis structure for the molecule 1,4 - dichlorobenzene (c6h4cl2) is s…
Nonpolar
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secondary pollutants are produced when primary pollutants are released …
C. photochemical smog
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what type of smog is often seen in urban areas due to secondary polluta…
B. photochemical smog
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ozone the pollutant and sulfuric acid are pollutants that are not relea…
Secondary pollutant
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vocs are air pollutants. what does voc stand for? volatile organic comp…
Volatile Organic Compounds
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10 multiple choice 2 points what was the purpose of the fume hoods in t…
To protect the user from reaction fumes.
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8 multiple choice 2 points recall what happened when iron filings were …
Fe is more reactive than Cu
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draw the lewis structure of ch3br and then determine if the molecule is…
The Lewis structure has C as the central atom with three H atoms and one Br atom bonded to it (Br has three lone pairs). The molecule \(CH_3Br\) is polar.
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read the excerpt from levitt and dubners freakonomics. driving around t…
the size of his business
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what is the hybridization state on the central c atom in the cyanate io…
\( sp \)
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8 multiple choice 2 points recall what happened when iron filings were …
Fe is more reactive than Cu ### Question 9
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multiple choice 2 points identify the spectator ions in the reaction. a…
A. \( \text{CaCl}_2\times2\text{H}_2\text{O} \)
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answer the question based upon the reaction below: (nh₄)₂cro₄(aq) + 2ag…
Double Displacement
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answer the question based upon the reaction below: (nh₄)₂cro₄(aq) + 2ag…
C. \(CrO_4^{2 - }(aq)+2Ag^{+}(aq)\to Ag_2CrO_4(s)\)
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2 multiple choice 2 points which of the following is not a reaction typ…
2. Radical 3. C. \(Ag_2CrO_4(s)\)
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1 multiple choice 2 points how many reactant molecules are involved in …
\(3\)