化学
化学反应、化学计量、分子结构与元素性质。
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part b: writing nuclear decay reactions: write equations for the follow…
11. $_{84}^{218}\text{Po} ightarrow_{82}^{214}\text{Pb}+_{2}^{4}\text{He}$ 12. $_{6}^{14}\text{C} ightarrow_{7}^{14}\text{N}+_{ - 1}^{0}\text{e}$ 13. $_{86}^{198}\text{Rn} ightarr…
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nuclear chemistry worksheet- show \k - u - e - s\ where necessary, othe…
$_{101}^{252}Md$; $_{96}^{247}Cm$; $_{89}^{215}Ac$; $_{91}^{171}Pa$; $_{3}^{6}Li$; $_{6}^{13}C$; $_{80}^{211}Hg$; $_{65}^{147}Tb$; $_{85}^{213}At$; $_{55}^{144}Cs$
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in your textbook, read about types of radiation. use the diagram to ans…
8. Composition: Helium - 4 nuclei; Symbol: $\alpha$; Mass (amu): 4; Charge: +2 9. Radiation Type: Beta; Composition: High - speed electrons or positrons; Symbol: $\beta$; Charge: …
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perceptual sets are the result of ______, which are concepts that peopl…
schemas
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the positively charged particle in an atom, never leaves the nucleus. d…
proton
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chemical vs. physical changes chemical changes physical changes
| Chemical Changes | Physical Changes | | --- | --- | | Formation of new substances, e.g., wood burning to ash and gases. | Change in state or appearance, e.g., ice melting to wat…
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the negatively charged particle in an atom, moves freely, can be releas…
electron
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zinc - 64 undergoes beta decay as shown: what is the the appropriate va…
A. 64 X. Ga Z. 31 True
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in alpha decay of u - 238: one alpha particle is emitted two gamma rays…
First question: One alpha particle is emitted Second question: A. 220 X. Rn Z. 86
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qualitative (categorical) or quantitative? if you end up getting the sa…
a. Quantitative b. Qualitative c. Qualitative d. Quantitative e. Qualitative f. Quantitative
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plutonium - 238 undergoes alpha decay as shown: what is the the appropr…
X: U A: 234 Z: 92 What isotope produces boron - 11 when it emits a positron: Carbon - 11
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section 4.4 changes to the nucleus—nuclear reactions in your textbook, …
1. c 2. a 3. d 4. b
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1. describe the proper way of detecting the odor of a chemical substanc…
1. Wafting. 2. It is safer to add acid to water because adding water to acid can cause violent boiling and splashing due to rapid heat release. 3. Follow specific lab - waste disp…
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chemical vs. physical properties delete this box when your done define …
**Chemical Properties**: - Definition: Characteristics that describe a substance's ability to change into a different substance through a chemical reaction. - Examples: Flammabili…
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review: what isotope is formed when u - 238 emits an alpha particle? * …
When U - 238 emits an alpha particle, thorium - 234 ($_{90}^{234}Th$) is formed. When an isotope emits a positron to produce boron - 11, the isotope is carbon - 11 ($_{6}^{11}C$).
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what occurs during a metastable isotopes gamma emission? * chemical rea…
1. Nuclear particle rearrangement 2. Two protons and two neutrons 3. Gamma decay
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what is the primary purpose of food irradiation? * to increase foods nu…
1. C. To kill harmful bacteria and parasites 2. A. Atomic number decreases by 2, atomic weight decreases by 4
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question 2 1 pts atm and ocean circ: wind essentials what are the prope…
air molecules are at higher densities
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what is the mass number if you have 18 protons, 22 neutrons, and 18 ele…
What is the Mass Number if you have 18 protons, 22 neutrons, and 18 electrons? 40 What is the Atomic Number if you have 18 protons, 22 neutrons, and 18 electrons? 18 What is the e…
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when sugar molecules break down under high heat, what happens? (check a…
caramelization, sweet, nutty and slightly bitter flavor compounds form
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what is the mass number if you have 15 protons, 17 neutrons, and 18 ele…
Mass Number: 32 Atomic Number: 15 Element: Phosphorus (P) Net Charge: - 3
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part b if this same reaction were carried out in an open container inst…
The mass would decrease because carbon dioxide gas could escape.
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1. which type of bond forms between water molecules and is responsible …
1. c. Hydrogen bonds 2. a. Covalent bond 3. c. Solute 4. a. water molecules stick to one another and form a bead 5. e. Adhesion 6. c. Uneven distribution of electrical charge 7. e…
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use isotope notation below to answer the this question: how many proton…
Protons: 22, Neutrons: 26, Electrons: 22
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which of the following involves both proteins and sugars reacting to ea…
B. Maillard Reaction
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use isotope notation below to answer this question: how many protons, n…
Protons: 12, Neutrons: 13, Electrons: 10
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students placed baking soda and vinegar in a closed flask. the reaction…
B. 50, 50
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what substance reacts with acids in the dough to create carbon dioxide …
C. baking soda (sodium bicarbonate)
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where did the water that was in the butter go? it didnt go anywhere it …
It turned into steam (evaporated)
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part 2: details of chemical, heating and fire safety, safety equipment,…
1. Waft the air towards your nose gently with your hand. Wafting. 2. Add acid to water. When acid is added to water, heat is dissipated safely; adding water to acid can cause viol…
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highland high school chemistry academic language development energy def…
Vocab Word: Energy Definition From Book: The ability to do work or cause change. Own Definition: The capacity for action or causing transformation. Picture / Diagram/ Formula and …
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define the following terms on your vocabulary cards: vocab word : energ…
Vocab Word: Energy Definition From Book: Varies by textbook. Own Definition: The ability to cause change or do work. Vocab Word: Potential Energy Definition From Book: Varies by t…
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darius buys a bottle of a chemical solution that contains 70% alcohol. …
350
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possible energy - releasing processes in the sun type of reaction equat…
B. nuclear reaction
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11. a student places a piece of zinc metal into a beaker of hydrochlori…
A chemical change occurred because new substances formed and there was a change in thermal energy.
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11. a student places a piece of zinc metal into a beaker of hydrochlori…
A chemical change occurred because new substances formed and there was a change in thermal energy.
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level 1 > unit 1 > text training > formative assessment > formative ass…
D. bats need humans to help them
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7. the reaction below shows the production of hydrogen chloride: h₂ + c…
The student is incorrect because carbon is not present; only hydrogen and chlorine atoms are involved.
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3 multiple choice 4 points an organic farm controls pests with the numb…
As $n$ gets to some value, $p$ should go to zero. ### Question 4
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the equation below models the burning of methane. ch₄ + 2o₂ = co₂ + 2h₂…
- The total number of hydrogen atoms is equal on both sides of the equation. - The same number of carbon atoms is present in the reactants and products.
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3. which statement correctly compares the number of atoms in the formul…
2CO$_2$ has more atoms, but magnesium hydroxide has more elements.
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3. the mass number of an isotope is equal to: * a) protons only b) neut…
3. c) Protons + Neutrons 4. c) Isotopes
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3. which statement correctly compares the number of atoms in the formul…
2CO$_2$ has more atoms, but magnesium hydroxide has more elements.
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1. what defines isotopes of an element? * a) different numbers of proto…
1. B. Different numbers of neutrons 2. A. Proton number
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13. the weighted average of isotopes is closest to: * a) the mass of th…
13. c) The isotope with the highest percent abundance 14. B) Variations in neutron count 15. B) The time required for half of the parent isotope to decay into daughter isotopes
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9. percent abundance describes: * a) the charge of an isotope b) how of…
9. b) How often an isotope occurs in a sample 10. B) Consistent and predictable fractionation mechanisms 11. B) Sulfur isotope fractionation patterns
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6. the atomic mass on the periodic table represents: * a) the lightest …
6. c) The average of all isotopes 7. c) amu 8. b) Mass of each isotope and percent abundance
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identify arrows pointing to bonding electrons.
a, b
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what means by concentration of cl- ions in sample of water 10ppm a. 10 …
A. 10 mg/L
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calculate the mass of nacl need to prepare 500 ml its concentration 10%…
C. 50 g
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before you read the chapter, answer each question with information you …
3.1: Physical and chemical properties of matter are crucial as they determine how substances interact within environmental systems, e.g., solubility affects nutrient availability …
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question 1 (1 point) the order of elements in the periodic table is bas…
d. the number of protons in the nucleus
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1. true or false: according to the aufbau principle, electrons fill orb…
1. False 2. False 3. True 4. False 5. False 6. False 7. False 8. False 9. True 10. True
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6. elements with similar electronic configurations often exhibit analog…
6. d) Periodic Law 7. c) Chemical reactivity 8. a) Halogens 9. b) Half - filled or fully - filled subshells 10. d) Physical properties of matter
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a one - line drawing showing the flow path for electrical circuitry or …
B. schematic
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the following skeletal oxidation - reduction reaction occurs under basi…
$Bi + 3OH^- ightarrow Bi(OH)_3+3e^-$
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indian territory boundaries, 1889 pre - organic act how was the tribal …
D. Land Runs
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according to the aufbau principle, electrons fill orbitals in which ord…
1. c) Based on increasing energy levels 2. a) Singly with parallel spins 3. b) Chromium (Cr) 4. c) Increasing number of protons 5. d) Increased effective nuclear charge
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a water molecule consists of a central oxygen atom to which two hydroge…
C. covalent
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----- mainly found near the rivers and lakes. it has a good drainage ca…
B. silt soil
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question 9 1 pts is h₃o⁺ polar or nonpolar? not applicable polar nonpol…
Question 9: B. Polar Question 10: B. Nonpolar
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what is the molecular geometry of xecl3+? note that you must draw the c…
Question 7: D. T - shaped Question 8: <120
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what is the molecular geometry of icl₃? note that you must draw the cor…
For ICl₃: C. T - shaped For SiOBr₂: D. Trigonal planar
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chlorine is used for the removal of unwanted substances in water by ---…
D. oxidation
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read the poem. skimming the bottom in the company of toes, i observe th…
D. abcd
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the temporary hardness of water is caused by calcium and magnesium --- …
A. bicarbonate
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which act requires regulation of chemicals used in mining? endangered s…
Toxic Substance Control Act
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5 select the correct answer. the ph scale measures the acidity of a liq…
C. The $H^+$ concentration in a solution with a pH of 4 is 0.01 times that of a solution with a pH of 2.
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choose the correct answer. which act regulates the chemicals used in mi…
Toxic Substance Control Act
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periodic trends 1. use the following bohr models to answer the question…
a) X: $1s^{2}2s^{2}2p^{6}3s^{1}$; Y: $1s^{2}2s^{2}2p^{6}3s^{2}$ b) Alkali metals c) Alkaline - earth metals d) Element X. It is an alkali metal with 1 valence electron. Losing thi…
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give the electron configuration for indium. you must use the noble gas …
[Kr]4d¹⁰5s²5p¹; 3
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give the electron configuration for lead. you must use the noble gas co…
[Xe]4f¹⁴5d¹⁰6s²6p²; 4
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based on the following balanced equation: c₃h₈ + 5o₂ → 3co₂ + 4h₂o what…
$1C_3H_8:4H_2O$
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writing in science detailed observation in terms of energy, think about…
Thermal energy from food (cooking - gas/electricity source), chemical energy in food (plant/animal source), electromagnetic energy from light (electrical current source)
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technician a says that gasoline is energy in chemical form. technician …
c. Both A and B
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what is the hybridization of the central atom in the xenon tetrafluorid…
$sp^3d^2$
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what is the hybridization of the central atom in the bromine pentafluor…
$sp^3d^2$
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what is the hybridization of the central atom in the bromine pentafluor…
$sp^3d^2$
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what is the hybridization of the central atom in the sulfur hexabromide…
$sp^3d^2$
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what is the electron geometry of kro₄? note that you must draw the corr…
Question 3: B. Tetrahedral Question 4: E. Trigonal bipyramidal
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the following structures represent the most probable resonance descript…
Question 1: True Question 2: False
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classify the following properties as either chemical or physical by che…
| Property | Physical Property | Chemical Property | |--|--|--| | Blue color | X | | | Density | X | | | Flammability | | X | | Dissolves in Water | X | | | Boils at 100 degrees |…
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a 5.366 gram sample of an organic compound containing c, h and o is ana…
Empirical formula: $C_7H_6O_2$ Molecular formula: The empirical formula mass, $M_{empirical}=7\times12.01+6\times1.008 + 2\times16.00=84.07+6.048+32.00 = 122.118\ g/mol$. Since th…
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what is the hybridization of the central atom in the sulfur hexabromide…
$sp^{3}d^{2}$
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use the following balanced equation to answer the questions: 3rb + p → …
256.41 g
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what is the hybridization of the central atom in the triiodide (i₃⁻) an…
$sp^3d$
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use the following balanced equation to answer the questions: 2koh → k₂o…
$18.02\ g$
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use the following balanced equation to answer the questions: 2koh → k₂o…
1
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use the following balanced equation to answer the questions: 2al + 3s →…
$53.96\ g$
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use the following balanced equation to answer the questions: 2al + 3s →…
2
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use the following balanced equation to answer the questions: 2mg + o₂ →…
48.62 g
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use the following balanced equation to answer the questions: 2mg + o₂ →…
2
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use the following balanced equation to answer the questions: 2mg + o₂ →…
2
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use the following balanced equation to answer the questions: 4k + 2s → …
64.14 g
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use the following balanced equation to answer the questions: 4k + 2s → …
2
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what is the hybridization of the central atom in the chlorine trifluori…
$sp^3d$
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what is the hybridization of the central atom in the sulfur tetrafluori…
$sp^3d$
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what is the hybridization of the central atom in the phosphorus pentach…
\(sp^{3}d\)
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what is the hybridization of the central atom in the amide (nh₂) anion?
$sp^{3}$
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directions: answer the following questions on the bubble form provided.…
1) d) Nitrogen 2) a) 4 3) b) When there are 8 valence electrons or a full valence shell 4) d) Halogens 5) b) Sulfur atoms have more protons in the nucleus creating a larger positi…