Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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what does the decrease in temperature when baking soda is mixed with ci…
The reaction changes in energy.
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atomic theory development - timeline the timeline depicting the develop…
science is not absolute and theories can be revised.
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q3. (sc.6.n.1.3 ) two scientists test how temperature affects sugar dis…
The investigation is replicable because both scientists got similar results
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true/false if you believe the statement to be more true than false, wri…
1. T 2. F 3. F 4. T 5. F 6. T 7. T 8. F 9. T 10. T 11. T 12. T
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32) would you normally expect (ne) to form compounds a. yes b. no c. so…
32) b. No 33) a. boron and aluminum 34) b. Protons are smaller than quarks
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use the shell model to answer the next question shell model 30) which e…
30) D. Sodium 31) b. 8 electrons
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based on the table which element most likely has physical and chemical …
1. b. Aluminum (Al) 2. d. Does not react 3. a. nucleus 4. a. Group 1
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24) which ion will have an overall charge of 1+ a. lithium b. fluorine …
24) a. lithium 25) b. fluorine
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20) which of the following elements would most likely be a shiny, gray …
20) a. aluminum 21) d. They have different mass and different electrical charge 22) c. orbitals 23) a. lithium
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15) ionization refers to the process of a. changing from one period to …
15) B. Losing or gaining electrons 16) C. metalloids 17) A. They are located in the left most column of the periodic table 18) B. silicon 19) C. Unlikely to combine with other ele…
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the three main groups of elements are metals, non - metals, and 10) a. …
11) a. metals 12) a. brittle 13) c. It has one valence electron on its outer shell 14) a. Atomic number
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find the element: is it: neutral atom
Helium (He)
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5) magnesium (mg) is located to the right of sodium (na) because mg has…
5. d. More protons 6. a. Become less metallic 7. b. A group 8. c. ions 9. b. -1 ions
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choose the best answer for each answer and put the letter on the line n…
1) a. The number of protons in the nucleus 2) c. Valence electrons 3) d. sodium 4) b. On the right side
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find the element: is it: neutral atom ion
The element is Hydrogen (H) and it is a Neutral Atom.
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what is the volume of 80.0 g of ether if the density of ether is 0.70 g…
$1.1\times 10^{2}$
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3. why cant carbon - 14 dating be used to determine the age of very anc…
3. B. Its half - life is too short for rocks older than 50,000 years 4. B. Tracking mass - dependent fractionation processes 5. C. Mass - dependent processes 6. B. Periods of sign…
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1. which of the following best describes why different isotopes of the …
1. B. Variations in neutron count 2. B. The time required for half of the parent isotope to decay into daughter isotopes 3. B. Its half - life is too short for rocks older than 50…
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17 multiple choice 1 point what is the process that changes one set of …
B. chemical reaction
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5. record the following parameters during the process: name each materi…
Weight of ball: $0.0890666\ lbf$ Specific weight of foam: $8.67\ lbf/ft^{3}$ Density of foam: $0.000235\ g/mm^{3}$
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compound,formula,atoms of carbon,atoms of hydrogen,atoms of oxygen,tota…
| Compound | Formula | Atoms of Carbon | Atoms of Hydrogen | Atoms of Oxygen | Total Number of Atoms | |--|--|--|--|--|--| | ethanol | $C_2H_5OH$ | 2 | 6 | 1 | 9 | | methanol | $C…
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8. fill in the following table that includes information on isotopes: i…
| Isotope symbol | Isotope Name | Atomic number | Atomic mass | # of protons | # of neutrons | # of electrons in neutral atom | |---|---|---|---|---|---|---| | $^{12}_{6}C$ | Carb…
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4. the most important consideration in caring for a patient who has bee…
4. A. maintain the airway 5. A. Patient age 6. C. Injected poisons are absorbed over time. 7. C. constipation 8. B. slows reflexes 9. C. Ativan 10. D. Induce vomiting. 11. A. para…
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7 multiple choice 1 point identify the molecule in the diagram above: a…
D. glucose (monosaccharide)
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practice: atomic calculations part 1 atomic structure 1. draw five prot…
1. Draw 5 protons in the nucleus and label +1. 2. Draw 6 neutrons in the nucleus and label 0. 3. Draw 2 electrons in the first energy - level and 3 in the second and label -1. 4. …
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what is a social consequence of organic farming? organic farmers face l…
Organic produce is not equally affordable to all people.
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how does the usda banning biodegradable plastic containing petroleum se…
This ends up making organic farmers think the government favors conventional farmers over them.
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in what way is converting a natural area into an organic farm just as b…
A. Either way, there is a loss of biodiversity with both conversions.
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read the sentence. organic farming often uses blank natural pesticides …
more applications of, help
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read the sentence. organic farming often uses _blank_ natural pesticide…
more applications of, help
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e cu (s) + agno₃ (aq) molecular total ionic net ionic f zn (s) + hcl (a…
| Reaction | Molecular | Total Ionic | Net Ionic | |--|--|--|--| | \(Cu(s)+AgNO_3(aq)\) | \(Cu(s)+2AgNO_3(aq) ightarrow Cu(NO_3)_2(aq) + 2Ag(s)\) | \(Cu(s)+2Ag^{+}(aq)+2NO_3^{-}(a…
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questions: 1. what is dehydration synthesis? 2. what is hydrolysis? pol…
1. Dehydration synthesis is a chemical reaction where two molecules combine to form a larger one with the loss of a water molecule. 2. Hydrolysis is a reaction where a water molec…
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a shiny, gold - colored bar of metal weighing 90.7 g has a volume of 4.…
yes, the density is 19.3.
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exit ticket — chemical combining of substances name: madison crance per…
1. (Circle one based on observation) 2. True 3. $2H_2 + O_2 ightarrow 2H_2O$ 4. Rusting of iron ($4Fe + 3O_2 ightarrow 2Fe_2O_3$) 5. A chemical change forms new substances with di…
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determine the balanced equation for the neutralization reaction between…
$H_2SO_3 + 2LiOH=Li_2SO_3+2H_2O$
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question 9 (1 point) chlorine 36 has an abundance of 24.22% what is the…
Question 9: c Question 10: c Question 11: a
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question 8 (1 point) (02.06 mc) which of the following elements in the …
- Question 8: B. Chlorine (Cl), because it is a halogen with a high effective nuclear charge - Question 9: D. Neon (Ne), because it has a high effective nuclear charge and small r…
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question 5 (1 point) (02.06 mc) as you move down group one of the perio…
- Question 5: a. They increase because of the higher number of occupied energy levels. - Question 6: b. Sodium because it has fewer protons attracting electrons in the same energy…
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question 1 (1 point) (02.06 lc) the effective nuclear charge is the sum…
Question 1: b. False Question 2: a. True Question 3: a. True Question 4: d. They decrease, because of the stronger effective nuclear charge.
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rank the following in order of increasing atomic radius 1. f 2. s 3. cl…
Question 3: 1. F, 3. Cl, 2. S Question 4: 3. Na, 1. Mg, 2. Be Question 5: c. Ca
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question 1 (1 point) in the periodic table hydrogen is placed and group…
## Question 1: b. Hydrogen has one outer shell electron and helium has a full valence shell of electrons ## Question 2: 3. B, 1. Ga, 2. Tl
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2. describe the roles of reactants and products in chemical reactions. …
2. Reactants are substances that participate in a chemical reaction and are consumed to form products. Products are the substances that are formed as a result of the chemical reac…
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3. is this process reversible by simple physical means? why or why not?…
1. Type: Synthesis; Balanced: $2Na + Cl_2 ightarrow 2NaCl$ 2. Type: Decomposition; Balanced: $2H_2O_2 ightarrow 2H_2O + O_2$ 3. Type: Combustion; Balanced: $2C_2H_2 + 5O_2 ightarr…
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b. iron reacts with oxygen to form rust. unbalanced equation: fe + o₂ →…
1. $4Fe + 3O_2 ightarrow2Fe_2O_3$ 2. Synthesis reaction 3. 90 4. To satisfy the Law of Conservation of Mass 5. Formation of a precipitate and change in clarity 6. Precipitate
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data analysis for each sect of reactions below, write a balanced molecu…
a. Molecular: $Mg(s)+2HCl(aq) ightarrow MgCl_2(aq) + H_2(g)$ Total Ionic: $Mg(s)+2H^{+}(aq)+2Cl^{-}(aq) ightarrow Mg^{2 +}(aq)+2Cl^{-}(aq)+H_2(g)$ Net Ionic: $Mg(s)+2H^{+}(aq) igh…
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question 3 of 19 chemistry: fundamentals and principles presented by ma…
Strong acid: $HBr$, $HClO_4$ Weak acid: $HF$, $H_3BO_3$ Strong base: $Ca(OH)_2$, $CsOH$ Weak base: $NH_3$
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chemistry: fundamentals and principles presented by macmillan learning …
Strong acid: HBr Weak acid: (No compound provided in this category from the given ones) Strong base: (No compound provided in this category from the given ones) Weak base: NH₃
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1. define a chemical reaction.
A chemical reaction is a process in which reactants are converted into products through the breaking and forming of chemical bonds.
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6. you slice a loaf of bread into thin pieces. later, one slice is toas…
The browning of the bread and the development of a different flavor and texture are clues that the toasting involves a chemical change.
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5. you add a scoop of sugar into your glass of hot tea. later, after yo…
Adding sugar to tea is a physical change; digesting sugar is a chemical change.
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you are given a 2m stock solution of nacl and are asked to make up 100 …
B. I would add 50 ml of the stock to 50 ml of water.
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you are given a 2m stock solution of nacl and are asked to make up 100 …
B. I would add 50 ml of the stock to 50 ml of water.
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4. a cube of ice melts into liquid water in your glass. later, the wate…
No, neither of these are chemical changes. They are physical changes as the chemical composition of water (H₂O) remains the same throughout the melting and boiling processes; only…
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what happens during evaporation? a liquid changes to a gas. a liquid ch…
A. A liquid changes to a gas.
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the diagram shows changes of state between solid, liquid, and gas. the …
Q
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ag₂o → __ ag + __ o₂ reactants products atoms total number atoms total …
$2Ag_2O ightarrow 4Ag + O_2$
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polonium has a mass number of 212 and an atomic number of 84. in a bala…
82 (corresponding to the first option in the multiple - choice list)
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which statement about the balanced equations for nuclear and chemical c…
A. A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.
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what is an example of a colloid? gasoline windshield wiper fluid salad …
1. D. milk 2. C. mud in water 3. A. gasoline
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which phrase describes transmutation? (1 point) the conversion of an at…
the conversion of an atom of one element into a different element through nuclear changes
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the element radium has a mass number of 226 and an atomic number of 88.…
C. 138
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a pure substance that consists entirely of 1 type of atom is an...... a…
- First question: B. element - Second question: C. neon, D. nitrogen, E. lead - Third question: C. nitrogen
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carbon uranium hydrogen helium used to date mummies very stable and non…
Carbon: used to date mummies Uranium: radioactive Hydrogen: explosive, very reactive, made of sun Helium: very stable and non reactive
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zn + h₃po₄ → zn₃(po₄)₂ + h₂ reactants products atoms total number atoms…
3, 2, 1, 3
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homogenous heterogenous soda lucky charms gatorade blood chex mix
Soda: homogenous Lucky Charms: heterogenous Gatorade: homogenous Blood: heterogenous Chex Mix: heterogenous
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when you strike a match, the friction generates heat that converts a sm…
2.89
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1. how is the modern periodic table arranged? 2. when the periodic tabl…
1. Elements are arranged in order of increasing atomic number, with elements of similar chemical properties in groups and elements with the same number of electron - shells in per…
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historically, utensils like forks and spoons were often made from silve…
0.301
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which crime is essentially a theft in violation of trust? select one: a…
1. D. Embezzlement 2. D. All of the above
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aluminum hydroxide (al(oh)₃) is an active ingredient in antacids, which…
0.199
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4. match the terms: a. reactant b. product c. precipitate ● ___ substan…
- Substance that goes into a reaction: A. Reactant - Substance that forms in a reaction: B. Product - Solid that forms from two liquids: C. Precipitate
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silicon (si) is the primary component in solar panels, which convert su…
23.6
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name: madison clarke period: 4 date: oct 7 grade:11 do now — chemical c…
1. Chemical change. New substance (gas) formed. 2. The solid is called a precipitate. Formation of a new substance is evidence. 3. $4Fe + 3O_2 ightarrow 2Fe_2O_3$
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nitrosyl chloride (nocl) is a highly toxic, yellow - green gas that irr…
0.13
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the balloons at a childs birthday party are filled with helium (he). ho…
0.633
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using the periodic table, find the molar mass of trichlorofluoromethane…
$137.36$
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using the periodic table, find the molar mass of silver nitrate (agno₃)…
169.88 g/mol
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in each figure, the dashed line represents the threshold kinetic energy…
B) substance B
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7. element a has 20 protons with 2 valence electrons, while element b h…
7. Element A 8. The element with 3 protons (Lithium)
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list the following substances in order of increasing boiling points: ba…
B. $H_2<CO < HF<BaCl_2$
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using the periodic table, find the molar mass of calcium (ca). write yo…
40.08 g/mol
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using the periodic table, find the molar mass of manganese (mn). write …
54.94 g/mol
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complete the blanks by answering the blanks for the indicated atoms in …
Molecular geometry of Carbon indicated by "a": Tetrahedral Bond angle around Carbon indicated by "a": 109.5° Hybridization at a of Carbon indicated by "a": $sp^{3}$ Molecular geom…
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which of the following is a compound - complex sentence? while at schoo…
After we get done with school, I have to go to work, but Luther has to go to practice.
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efavirenz (sold as sustiva™) is an anti - retroviral medication prescri…
For carbon marked with '*': Bond angle: 120°, Hybridization: $sp^{2}$, Electron geometry: trigonal planar For carbon marked with '@': Bond angle: 109.5°, Hybridization: $sp^{3}$, …
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using the periodic table, find the molar mass of oxygen gas (o₂). write…
32.00 g/mol
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7. parent - child relationship - how does coles relationship with his m…
7. The relationship may change based on movie events; trust is key to the emotional bond. 8. Dr. Crowe may face dilemmas like confidentiality and informed consent. 9. The twist sh…
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across: 1. when a solution has more solute than it can hold. 3. when a …
1. Saturated 2. Insoluble 3. Suspension 4. Saturation 5. Tyndall; Dissolved 6. Alloy; Colloid 7. Solute; Solvent
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question 18 of 23 > the rate of a certain reaction was studied at vario…
$E_a = 138.3\ kJ/mol$ $A = 1.2\times10^{16}\ s^{-1}$
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question 18 of 23 the rate of a certain reaction was studied at various…
$E_a = 153\ kJ/mol$, $A = 2.4\times10^{15}\ s^{-1}$
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calculate the rate constant, k, for a reaction at 57.0 °c that has an a…
$1.61\times 10^{-2}$
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name: london coe period: 4th soluble or insoluble in water: cooking oil…
Solubility in water: Cooking oil - insoluble, Sugar - soluble, Soap - soluble, Dirt - insoluble, Salt - soluble. Solute - Solvent: Salt - water: Salt (solute), Water (solvent); Su…
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multiple choice 2 points which biogeochemical cycle does not include an…
A. Phosphorus
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complete the rhyme scheme. a a a b b april! april! are you here? oh, ho…
A, A, A, B, B
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complete the rhyme scheme. a b b b c we will never walk again slowly, w…
We will never walk again - A Slowly, we two, - B In spring when the park is sweet - B With midnight and with dew, - B And the passers - by are few. - B
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true or false. 1. a physical property of cobalt is that it is magnetic.…
1. True 2. False 3. False 4. True
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which elements did mendeleev change the atomic mass of to better match …
Be - Beryllium, In - Indium
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initial - rate data at a certain temperature is given in the table for …
$k = 8.75$, units: $s^{-1}$, $y=-30$
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11. the situation described in this passage was caused by 1. native ame…
11. 2. European settlement in North America 12. 3. forming alliances to fight the colonial settlers
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which statement names characteristics of a mineral? o it must be crysta…
It must be crystalline and have a definite chemical composition.