化学
化学反应、化学计量、分子结构与元素性质。
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select the correct answer. which statement describes both homogeneous m…
C. Their components can be separated by physical processes.
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select the correct location. which part of the periodic table would con…
The yellow - colored block (the inner transition metals region) of the periodic table contains elements with a partially filled \( f \)-sublevel.
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drag each tile to the correct location. several properties of water are…
# Explanation: ## Step1: Definir propiedades físicas y químicas Las propiedades físicas son aquellas que se pueden observar o medir sin cambiar la composición de la sustancia. Las…
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elements of each group in the periodic table have certain characteristi…
- "very reactive nonmetals" → halogens - "don't react naturally with other elements" → noble gases - "solids at room temperature" → alkali metals
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guided practice the american south before you begin reading, lets check…
- nary: not one - mistletoe: a green plant that lives on other plants - obstinate: stubborn - lye: a strong chemical used in making soap - pendulum: a weight hanging from a fixed …
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type the correct answer in the box. calculate the density of the substa…
3.9
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3.) what is the formula for manganese (iii) oxide? ○ mn₂o₃ ○ mn₃o₂ ○ mg…
A. \(Mn_2O_3\)
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3.) what is the formula for manganese (iii) oxide ○ mn₂o₃ ○ mn₃o₂ ○ mg₂…
A. \( \text{Mn}_2\text{O}_3 \)
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2.) what is the correct ionic formula for chromium (ii) iodide? ○ $\\ce…
B. \( \text{CrI}_2 \) (assuming the second option is \( \text{CrI}_2 \))
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2.) what is the correct ionic formula for chromium (ii) iodide? ○ cr₂i₂…
B. $\text{CrI}_2$ (assuming the second option is labeled as B, with the option text $\text{CrI}_2$)
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1.) what is the charge of the chromium ion? chromium (ii) iodide (1 poi…
A. +2
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type the correct answer in the box. round your answer to the nearest hu…
63.55
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hematite is a naturally occurring mineral and a common form of iron ore…
B. The hematite particles rearrange to form a new substance.
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several properties of the element magnesium are shown. which one is a c…
E. burns when exposed to heat
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drag each tile to the correct location. identify the reactants and the …
Reactivos: $Fe_2O_3$, $C$ Productos: $Fe$, $CO_2$
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type the correct answer in each box. balance the equation. \\(\\square\…
Los coeficientes son 5, 2, 5, 2, 4 respectivamente para \( SiO_2 \), \( CaC_2 \), \( Si \), \( CaO \), \( CO_2 \). Así, en los espacios: \( \boldsymbol{5} SiO_2 + \boldsymbol{2} C…
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select the correct answer. which reaction is a decomposition reaction? …
A. \( 2KClO_3 ightarrow 2KCl + 3O_2 \)
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11. nh₄cl 12. fe(no₃)₃ 13. tibr₃ 14. cu₃p 15. snse₂ 16. gaas 17. pb(so₄…
11. Ammonium chloride 12. Iron(III) nitrate 13. Titanium(III) bromide 14. Copper(I) phosphide 15. Tin(IV) selenide 16. Gallium arsenide 17. Lead(IV) sulfate 18. Beryllium bicarbon…
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select the correct answer. which displacement reaction is most likely t…
C. \( \text{BaCl}_2 + 2\text{Na} ightarrow 2\text{NaCl} + \text{Ba} \)
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select the correct answer. the substances sodium (na), oxygen (o₂), and…
B. Sodium oxide is created by the chemical reaction.
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5.) which of the following is the correct formula for ammonium phosphat…
D. $\boldsymbol{(NH_4)_3PO_4}$ (assuming the last option is labeled D; if the original options had labels like A, B, C, D with the last being D, then the answer is D. $\ce{(NH_4)_…
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select all the correct answers the electron configurations of some elem…
The elements that can form ions with multiple charges are: - Iron: $[\text{Ar}] 3d^6 4s^2$ - Cobalt: $[\text{Ar}] 3d^7 4s^2$ (Select the checkboxes for iron and cobalt.)
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4.) what is the difference between sulfate and sulfite? (1 point) \\big…
B. Sulfate has 4 oxygens and sulfite has 3
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what causes atoms to form covalent bonds? in a covalent bond, two atoms…
valence electrons
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what is the charge of a nitride ion and how do we know this? 1- ; the p…
3-; the group it is in
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2.) what does the --ate ending in nitrate tell us? (1 point) there are …
C. It is a polyatomic ion
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at the top of page 4, how does the figurative language contribute to th…
- It shows the author's feeling of hopelessness - It describes the salvagers' actions in a mocking way
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1.) why would you put parentheses around a polyatomic ion in a formula?…
C. There is more than one of the polyatomic ion
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recovering artifacts from shipwrecks on october 5, 1804, the spanish sh…
Some items are covered in a thick patina that covers important details.
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drag the tiles to the correct boxes. not all tiles will be used. the ox…
- \( \text{MnO}_2 \): manganeso(IV) oxide - \( \text{MnCl}_2 \): manganeso(II) chloride
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select the correct location on the image. the orbital diagram shows the…
El último electrón para el azufre (con 16 electrones) ocupará el suborbital \(3p\) (en el diagrama, el suborbital \(3p\) que es el segundo o el que tiene la flecha, donde se empar…
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16 select the correct answer. the elements beryllium, calcium, and stro…
D. \( Sr < Ca < Be \)
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15 select the correct answer. what is the chemical name of the compound…
D. potassium cyanide
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naming ionic compound worksheet name: 1. kcl 2. mgo 3. k₂o 4. alcl₃ 5. …
1. Potassium chloride 2. Magnesium oxide 3. Potassium oxide 4. Aluminum chloride 5. Calcium oxide 6. Barium sulfide 7. Magnesium chloride 8. Aluminum sulfide 9. Sodium hydride 10.…
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14 type the correct answer in each box. complete the chemical formula f…
- Magnesium Nitride: $\boldsymbol{Mg_3N_2}$ - Calcium Chloride: $\boldsymbol{CaCl_2}$
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select the correct answer. how does substituting a hydrogen atom with a…
B. The boiling point of the new compound increases.
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however, if done incorrectly or for too long, the chemical reaction can…
1. shiny 2. brightly
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select all the correct answers. which substances are made up of polymer…
- DNA - the proteins in hair - rubber car tires
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classify each of the following as characteristic of ionic or covalent b…
### Ionic: - Usually dissolves in water - High melting point - Involves the transfer of electrons ### Covalent: - Low conductivity - Involves the sharing of electrons - Occurs bet…
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drag each tile to the correct location. categorize each hydrocarbon as …
# Explicación Breve: - **Saturados**: Hidrocarburos con solo enlaces simples (alcanos, cicloalcanos sin dobles o triples enlaces). - 3 - methyloctane: Alcano (enlaces simples, fór…
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select the correct answer from each drop - down menu. the compound ammo…
Para el primer menú desplegable (número de \(NH_4^+\) iones): dos Para el segundo menú desplegable (número de \(SO_4^{2-}\) iones): uno
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1) nabr 2) sc(oh)₃ 3) v₂(so₄)₃ 4) nh₄f 5) caco₃ 6) nipo₄ 7) li₂so₃ 8) z…
1) Sodium bromide 2) Scandium(III) hydroxide 3) Vanadium(III) sulfate 4) Ammonium fluoride 5) Calcium carbonate 6) Nickel(III) phosphate 7) Lithium sulfite 8) Zinc phosphide 9) St…
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calculate the molality of each of the following aqueous solutions. part…
\( 4.52\space m \)
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no₃⁻ so₄²⁻ c₂h₃o₂⁻ po₄³⁻ co₃²⁻ oh⁻ nh₄⁺ acetate nitrate sulfate hydroxi…
To solve this ion - name matching problem, we analyze each ion and its corresponding name: ### Step 1: Analyze \(NO_3^-\) The ion \(NO_3^-\) is the nitrate ion. So we match \(NO_3…
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5.17 m nahco₃ solution (density of solution = 1.19 \\(\frac{g}{ml}\\)).…
The molality of the $\text{NaHCO}_3$ solution is approximately $\boxed{6.84 \text{m}}$ (or 6.84 mol/kg).
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1.23 m sugar (c₁₂h₂₂o₁₁) solution (density of solution = 1.12 \\(\\frac…
$\boxed{1.76\ \text{m}}$
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select the correct answer from each drop - down menu. the compound ammo…
- Para \( \text{NH}_4^+ \): 2 - Para \( \text{SO}_4^{2-} \): 1 - Tipo de ion: poliatomic
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select the correct answer from each drop - down menu. a carbon atom for…
Primer menú (número de enlaces): four Segundo menú (forma de enlace): sharing
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select the correct answer from each drop - down menu. a carbon atom for…
Primer menú desplegable: four
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select the correct answer. which property is typical of a covalent comp…
B. They have low melting and boiling points.
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what is the correct way to represent the ionic compound sodium fluoride…
El compuesto iónico sodio flúor (NaF) se representa como $Na^+$ (cation, sin el electrón de valencia) y $F^-$ (anión, con el electrón ganado, completando su octeto). La estructura…
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5 select the correct answer. which atom or ion is the largest? a. k b. …
A. K
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select all the correct answers. which two properties are characteristic…
- brittleness - high melting point
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what is the correct answer? 27. what is the chemical formula of potassi…
B. \( \text{Ir}_4\text{F}_3 \) (Note: There is likely a typo in the problem's options; the correct formula should be \( \text{IrF}_3 \), but among the given choices, this is the c…
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Question was provided via image upload.
The option with three pairs of dots (6 electrons) and one single dot (total 7 electrons) representing the Lewis structure of Cl. (If we consider the options, the one with two pair…
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5.) there is no number after the \o\ in li₂o because.... (1 point) ○ th…
C. There is only one oxygen atom
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formula 1) sodium phosphide 2) magnesium nitrate 3) lead (ii) sulfite 4…
1) $\text{Na}_3\text{P}$ 2) $\text{Mg(NO}_3\text{)}_2$ 3) $\text{PbSO}_3$ 4) $\text{Ca}_3(\text{PO}_4)_2$ 5) $(\text{NH}_4)_2\text{SO}_4$ 6) $\text{AgCN}$ 7) $\text{Al}_2\text{S}_…
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4.) the \2\ in li₂o represents that: (1 point) there are two oxygen ato…
B. There are two lithium atoms in lithium oxide
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3.) how can you make li⁺ and o²⁻ ions with different charge numbers bal…
D. Add more $\text{Li}^+$ ions, C. Add more of both $\text{Li}^+$ and $\text{O}^{2-}$ ions (Note: Assuming the options are labeled as follows: A. You can't!, B. Add more $\text{O}…
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2 no₂ + h₂o → 2 hno₃ + no check each element that is not balanced. n h …
N
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2.) the \staircase\ on the periodic table separates: (1 point) liquids …
D. Metals from non - metals
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ch₄ +? o₂ → co₂ + 2 h₂o what coefficient is needed in front of the o₂? …
2
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2 khco₃ → k₂o + h₂o + 2co₂ which of the following are the reactants in …
The reactant in the reaction is $\boldsymbol{KHCO_{3}}$ (the box corresponding to $KHCO_{3}$ should be selected, and the boxes for $K_{2}O$, $H_{2}O$, and $CO_{2}$ should not be s…
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check each element that is not balanced. \\( 5\\text{li} + \\text{n}_2 …
Li (since Li atoms are not balanced: 5 on left, 6 on right; N is balanced)
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chemical reactions - problems check each element that is not balanced. …
The elements (colors) that are not balanced are the dark blue (N) and red (O) and also the dark blue (N) and red (O) are not balanced. But looking at the boxes (the four squares f…
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chemical reactions - problems 4 nh₃ + 5 o₂ → 4 no + 6 h₂o which of the …
NO, H₂O
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11. complete the equation in the table below. number of neutrons = ____…
Number of neutrons \( = \) Mass number \( - \) Atomic number (or Number of protons)
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6. is the following sentence true or false? two atoms of the same eleme…
False ### Question 7
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stoich ws 2 1. how many molecules of hcl must react to form 53 grams of…
\( \approx 1.23\times10^{24} \) molecules of \( \text{HCl} \) ### Problem 2a
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select the correct answer from each drop - down menu. humans use many c…
First drop - down: eutrophication Second drop - down: algal blooms
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what coefficients are needed to balance the following chemical equation…
2,2,1 (the orange option)
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how many atoms of oxygen are in the product side of the balanced chemic…
6
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how many atoms of hydrogen are on the reactant side of the balanced che…
4
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how many atoms of oxygen are in the chemical formula for potassium carb…
6
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how many atoms of oxygen are in the chemical formula for sulfuric acid,…
4
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write names for the following compounds and classify as ionic (i) or co…
27. $\text{P}_4\text{O}_{10}$: Tetraphosphorus decoxide, C 28. $\text{Li}_3\text{P}$: Lithium phosphide, I 29. $\text{KHSO}_4$: Potassium bisulfate, I 30. $\text{FeS}$: Iron(II) s…
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how many hydrogen atoms are in the formula for glucose, c₆h₁₂o₆?
12
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which of the following chemical formulas are the reactants? co₂ and 2h₂…
The reactants are $\ce{CH_{4}}$ and $\ce{2O_{2}}$, so the correct option is the one with "CH₄ and 2O₂".
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32. salts are examples of ____. a. nonionic compounds. b. metals. c. no…
32. d. ionic compounds. 33. a. They have delocalized valence electrons. 34. c. has non-directional bonds between delocalized electrons and the metal atom nuclei 35. a. zinc carbon…
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ionic & covalent compounds worksheet write formulas for the following c…
1. $\text{IrCl}_3$, I 2. $\text{MnO}_4^-$, I 3. $\text{Ag}_2\text{SiO}_3$, I 4. $\text{Zn(OH)}_2$, I 5. $\text{CS}_2$, C 6. $\text{FePO}_4$, I 7. $\text{CuI}_2$, I 8. $\text{SnF}_…
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element | symbol | atomic number | mass number | # of protons | # of ne…
| Element | Symbol | Atomic Number | Mass Number | # of Protons | # of Neutrons | # of Electrons | Charge | |---------------|-----------------|---------------|-------------|------…
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1. go to the website: phet.colorado.edu. click on html5 simulations on …
2. a. Protons have a positive charge, electrons negative. b. Neutrons have no electrical charge. 4. Protons and neutrons 5. Protons 6. a. Lithium b. Helium c. Beryllium 7. Electro…
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q6-the graph shows first ionization energy for elements with atomic num…
A. Sodium has one valence electron in a new, higher energy level that is farther from the nucleus and more shielded.
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q-4 a chemist is comparing potassium (k) and fluorine (f) to determine …
C. Fluorine has a smaller atomic radius, resulting in stronger attraction between the nucleus and incoming electrons.
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4. which formulas and their respective names do not match? i) bao bariu…
A. I and II
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n₂o₅ is nitrogen trihydride (ammonia) and bf₃ is boron trifluoride. wha…
D. Aluminum chloride - Ionic compounds do not get a prefix on the first name if there is only one of that element
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the element germanium is a lustrous, hard, grayish - white solid in the…
C. metalloid
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the diagram shown is an example of the element a boron b bromine c nitr…
A. boron
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during a physical science lab investigating chemical reactions, several…
A. 30 grams
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3. how will you use your periodic table to find the number of neutrons?…
### 3. Locate the element's atomic number (protons) on the periodic table, then use the formula: $\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$ ### 4. The…
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part iii: isotopes 1. play with the simulation to determine: a. which p…
### Part III: Isotopes 1. a. Protons and neutrons b. Electrons 2. b. 17 c. 18 3. - Same number of protons - Same atomic number - Same element identity 4. - Different number of neu…
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do now: name the following compounds and identify bond type of the foll…
### 1. For $\ce{NH3}$: #### Naming the compound: The compound $\ce{NH3}$ is named ammonia (or nitrogen trihydride). #### Identifying bond type: - **Bond type**: Covalent bond (pol…
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part ii: symbol screen 1. below is the atomic symbol for a lithium ion …
1. Completed Atomic Symbol Table: | Position in symbol box | Term to describe this information | Particle used to determine this | How the value is determined | |-----------------…
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use your periodic table to fill in the chart and to answer the followin…
| Element Name | Symbol | Protons | Neutrons | Electrons | Atomic Weight | |---|---|---|---|---|---| | Boron | B | 5 | 6 | 5 | 11 | | Carbon | C | 6 | 7 | 6 | 13 | | Calcium | Ca …
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14. name noble gas that is in the 1st period in the periodic table. 15.…
s are based on periodic table properties, element families, and atomic structure rules.
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1. what is the atomic number of silicon? 2. a rubidium atom has ______ …
1. 14 2. 37 3. 16 4. Au 5. 92 6. 118.71 7. 58.69 8. 8 9. 44 10. 223 11. Noble Gases (Group 18) 12. Fluorine (F) 13. Calcium (Ca)
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questions 1) how do the atomic radii change as you go down group ia? 2)…
Atomic radii increase as you go down Group IA. ### 2)
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is this electrolytic cell thermodynamically favorable or thermodynamica…
D. A positive Ecell makes the reaction favorable.
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calculate the electrochemical cell potential. $2\\ce{al} + 3\\ce{sn^{+2…
1.52 V
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half-reaction | e° (v) e²⁺ + 2e⁻→ e | + 0.76 g⁺ + e⁻ → g | + 0.10 j²⁺ +…
-0.92 V