化学
化学反应、化学计量、分子结构与元素性质。
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types of chemical reactions quiz chemistry b beach el(a - f) semester 2…
synthesis
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3. which of the following are diatomic elements? select all that apply.…
- hydrogen (the checkbox next to hydrogen should be selected) - bromine (the checkbox next to bromine should be selected) - iodine (the checkbox next to iodine should be selected)…
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types of chemical reactions quiz chemistry b beach el(a-f) semester 2 3…
synthesis
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select the correct answer. what is the chemical formula for the compoun…
C. $(NH_4)_3PO_4$
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select the correct answer beryllium (be) and fluorine (f) combine to ma…
A. beryllium fluoride
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select all the correct answers. why do the atoms in a piece of copper m…
A. The charges of the positive and negative copper ions cancel each other out.
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classify the elements as diatomic or monatomic. if necessary, refer to …
To solve this, we analyze each element: ### Diatomic Elements (exist as \( X_2 \) molecules): - **Hydrogen** (\( \text{H}_2 \)): Diatomic. - **Oxygen** (\( \text{O}_2 \)): Diatomi…
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select the correct answer. which structure is the lewis structure for a…
C. $\ce{H - \overset{..}{N} - H}$ (with a third H bonded to N, as shown in the option's structure with N having a lone pair and three single bonds to H)
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select the correct answer. which two particles can form an ionic bond w…
C. a positive calcium ion and a negative oxygen ion
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types of chemical reactions quiz chemistry b beach el(a - f) semester 2…
The reactions that are examples of single - replacement reactions are: - \(2K_{(s)}+2HCl_{(aq)} ightarrow2KCl_{(aq)}+H_2_{(g)}\) - \(Mg_{(s)}+Zn(NO_3)_{2(aq)} ightarrow Mg(NO_3)_{…
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the diagram shows water at the molecular level. what property of a wate…
the polarity of the molecule, which involves a slightly negative oxygen atom and slightly positive hydrogen atoms
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name molar conversion practice show all your work and circle your final…
\( \boxed{1.47 \times 10^{23} \text{ molecules}} \) ### Question 2: How many moles are in 52.0 grams of \( \text{NH}_3 \)?
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assignment: identifying types of reactions identify the type of reactio…
Combustion Reaction ### 2. For $\boldsymbol{\ce{Ca + Mg(NO3)2 -> Mg + Ca(NO3)2}}$
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5. what are the coefficients when this equation is balanced? __ cu + __…
1,2,2,1 (corresponding to the option with coefficients 1,2,2,1)
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balancing chemical equations quiz chemistry b beach el(a-f) semester 2 …
The coefficient for phosphoric acid (\(H_3PO_4\)) is 1. Wait, no, wait. Wait, in the balanced equation: \(3KOH + H_3PO_4 ightarrow K_3PO_4 + 3H_2O\). Wait, no, wait, let's recheck…
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3. which of the following are reactants in this equation? select all th…
- zinc - copper (II) sulfate
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products and reactants in a balanced chemical reaction have the same nu…
1. A. atoms 2. 3
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how many atoms of hydrogen in the product side of the balanced equation…
A. 2
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the ________ step in balancing a chemical equation is to take inventory…
1. A. first 2. C. subscript
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metallic ions or cations are _________ charged ions. a positively b neg…
A. positively
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in a binary ionic compound, the electrons are a shared b transferred fr…
B. transferred from the metal to the nonmetal
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if combining cation a with a +3 charge and anion x with a -3 char would…
A. AX
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the ratio of the elements in a binary ionic compound are based on the e…
1. A. oxidation number 2. A. AX
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the vertical (top to bottom) parts of the periodic table are called \gr…
1. B. families 2. A. transition
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what are the horizontal (from left to right) parts of the periodic tabl…
1. B. periods 2. B. families
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are the isotopes that make up the air we breathe stable or unstable? a …
1. B. stable 2. B. stable
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balance & tell the types of equations: _____ p + _____o₂ → _____p₂o₅ __…
1. $4P + 5O_2 ightarrow 2P_2O_5$ (Synthesis) 2. $2Na + 2H_2O ightarrow 2NaOH + H_2$ (Single Displacement) 3. $2Ag_2O ightarrow 4Ag + O_2$ (Decomposition) 4. $6CO_2 + 6H_2O ightarr…
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and ___ are the two subatomic particles found in an element’s a electro…
B. neutrons, protons
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______ structure controls the physical properties of elements. a nucleu…
B. Electron
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how many valence electrons do noble gases have? a seven b eight c six
B. eight
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nutrition crossword 9 use the clues provided to complete the crossword …
To solve this nutrition - related crossword puzzle, we analyze each clue: ### Across Clues - **4. Certain foods affect the chemistry of this**: The answer is "BRAIN" (length 5). F…
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7. what coefficients would correctly balance this equation? \\( \\ce{na…
d. 1, 3, 3, 1
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7. what coefficients would correctly balance this equation? na₃po₄ + ko…
7. a. 1, 3, 3, 3 8. d. 1, 1, 1, 2
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balancing equations name 1. a chemical reaction is a process in which a…
1. b. the law of conservation of mass applies 2. b. atoms are rearranged 3. b. adding coefficients 4. d. outermost electrons 5. c. zinc and copper (II) sulfate
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2) if 3.00 moles of h₂o are produced, how many moles of oxygen must be …
2) 1.50 moles of $\text{O}_2$ 3) 2.5 moles of $\text{H}_2$
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drag the correct answer to the box. which counterclaim would help balan…
Herbicides quickly kill weed roots while preserving grass, making them efficient and easy gardening tools.
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regina is writing an argument against adding fluoride to the city’s dri…
D. The Food and Drug Administration stated in 2000 that fluoride is a drug subject to regulation when it is "used in the diagnosis, cure, mitigation, treatment, or prevention of d…
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bell work january 29, 2026 what are the oxidation number of the followi…
1. Iodine: 0 (if elemental); in compounds, depends on the compound, but likely 0 here. 2. Magnesium: 0 (if elemental); in compounds, +2 (group 2 metal). 3. Carbon: 0 (if elemental…
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practice: isotope calculations #1 part 1 use the notation below to answ…
isotopes 2.
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calculate the average atomic mass for oxygen given the following; isoto…
E. 0.997572
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calculate the average atomic mass for an unidentified element given the…
s (for each blank): 1. \( 0.78994 \) (Option F) 2. \( 18.946744 \) (Option G) 3. \( 0.10001 \) (Option E) 4. \( 2.498834 \) (Option I) 5. \( 0.11013 \) (Option D) 6. \( 2.861463 \…
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calculate the average atomic mass for oxygen given the following; isoto…
For blank 1: 0.997572 (Option E) For blank 2: 15.9994791 (Option B) For blank 3: 0.000381 (Option D) For blank 4: 0.0064767 (Option H) For blank 5: 0.0020514 (Option C) For blank …
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read the passage from a letter that president jimmy carter wrote to con…
Protecting the environment is essential for maintaining Americans' quality of life.
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question 6 (1 point) convert 454 in³ into cm³ and into ml. (2.54 cm = 1…
\(7.44\times 10^{3}\) (or \(7440\))
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question 4 (2 points) convert 454 in³ into cm³ and into ml. (2.54 cm = …
The correct conversion factor is \(\frac{16.387\ \text{cm}^3}{1\ \text{in}^3}\), so the second option's blank is filled with \(\frac{16.387\ \text{cm}^3}{1\ \text{in}^3}\) and the…
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question 3 (2 points) convert 454 in³ into cm³ and into ml. (2.54 cm = …
The correct conversion factor is \( (2.54\ \text{cm})^3=(1\ \text{in})^3 \) leading to \( 16.387\ \text{cm}^3 = 1\ \text{in}^3 \). \( 454\ \text{in}^3 = 454\times16.387\ \text{cm}…
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convert 454 in³ into cm³ and into ml. (2.54 cm = 1 in). put in the unit…
The correct option is the one with the conversion factor having units \( \frac{\text{cm}^3}{\text{in}^3} \) (the third option in the provided list, where the numerator is \( \text…
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a chemist has 500 ml of a 30% acid solution. she adds x milliliters of …
The horizontal asymptote $y = 10$ means that the final concentration will always be greater than 10%.
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diluted to have 30% acidity. the graph models the percent of acidity in…
30 liters *Correction note: Rechecking the graph, when $y=0.3$, the $x$ value is 30 liters. The correct mixture equation assumes starting with 30L of 50% acid: $$0.5(30) + 0.2x = …
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the mass of a hydrogen atom is about 1.67e-24 grams. the mass of a plut…
A. $2.43 \times 10^{2}$
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in this lab, you will conduct a series of reactions and then classify e…
products
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how do you know there was a chemical reaction? check all indicators bel…
A. A solid precipitate formed. B. The color changed. C. A gas was produced. D. The reaction absorbed or released heat.
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fill in the blanks in the sentence below. in the reaction at blood fall…
For the first blank (reactants): iron, oxygen, and water For the second blank (product): iron oxide (rust)
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question 18 which of the following is chemically inert (unreactive)? ○ …
C. neon (atomic number 10)
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question 16 what type of chemical bond can form between an atom with 11…
B. ionic
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considering the activity series given for nonmetals, what is the result…
no reaction
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which products would form if chlorine gas was bubbled through a solutio…
C. NaCl and Br₂
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question 12 4 points what does ch4 mean? ○ this is an inorganic molecul…
B. There is one carbon and four hydrogen atoms.
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in which type of chemical reaction do two or more substances combine to…
A. synthesis
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which type of chemical reaction occurs in ca + cl2 → cacl2? synthesis c…
A. synthesis
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sodium chloride reacts with copper sulfate to produce sodium sulfate an…
double replacement reaction.
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which is a characteristic of a decomposition reaction? substance p repl…
Substance XYZ breaks down into X, Y, and Z.
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reaction occurs when one compound reacts and is broken down into differ…
decomposition
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propane burns in air to produce carbon dioxide and water. what is this …
B. combustion
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smoker’s toothpaste actually has corundum in it! corundum has a hardnes…
Corundum is harder than the apatite that makes up your teeth ### Second Part (Short - Answer)
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a double replacement reaction can be best described as a reaction in wh…
ions are exchanged between two compounds.
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which type of chemical reaction occurs in 2kclo3 → 2kcl + 3o2? ○ synthe…
B. decomposition
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question 9 4 points an acid with a ph of 6 has ______ hydrogen ions tha…
D. 10 - fold more
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choose the correct products for the double replacement reaction below. …
s: - Correct products: \( \text{KNO}_3 + \text{AgCl} \) - Precipitate product: \( \text{AgCl} \)
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the main mineral making up your teeth is the mineral apatite. according…
Silica (quartz) is harder
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choose the correct products for the double replacement reaction below. …
B. \( \text{KNO}_3 + \text{AgCl} \) (assuming the option with \( \text{KNO}_3 + \text{AgCl} \) is labeled as B, adjust the label as per the original question's option numbering if…
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question 7 the chemical symbol o=o means ______. this is an ionic bond …
D. the atoms are double bonded (assuming the last option is labeled D; if the original options had labels like A - D, with the last option being the correct one, the answer is the…
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choose the correct products for the double replacement reaction below. …
- Correct products: \( \text{PbSO}_4 + \text{MgCl}_2 \) - Precipitate - forming product: \( \text{PbSO}_4 \)
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choose the correct products for the double replacement reaction below. …
\( \text{PbSO}_4 + \text{MgCl}_2 \) (corresponding to the option "PbSO₄ + MgCl₂")
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complete the following equations (note that the equations are not balan…
no reaction (the option: no reaction)
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complete the following equations (note that the equations are not balan…
A. \( \text{AlCl}_3 + \text{Ag} \)
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use the activity series below to predict whether the following reaction…
s: - For the reaction $\boldsymbol{Cl_2 + 2RbI ightarrow 2RbCl + I_2}$: The reaction will take place. - For the reaction $\boldsymbol{I_2 + NiBr_2 ightarrow NiI_2 + Br_2}$: The re…
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use the activity series below to predict whether the following reaction…
s: - For $\ce{Ca + ZnBr_2 ightarrow CaBr_2 + Zn}$: The reaction will take place. - For $\ce{Cu + 2KNO_3 ightarrow Cu(NO_3)_2 + 2K}$: The reaction will not take place.
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use the activity series below to predict whether the following reaction…
s: - For \( \text{Ag} + \text{NaNO}_3 ightarrow \text{AgNO}_3 + \text{Na} \): The reaction does not take place. - For \( \text{Mn} + \text{CaO} ightarrow \text{Ca} + \text{MnO} \)…
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predict the missing component of each reaction.\ $2\\ce{na} + \\ce{cl_{…
s: For $2\text{Na} + \text{Cl}_2 ightarrow ?$: $\boldsymbol{2\text{NaCl}}$ For $2\text{MgO} ightarrow ?$: $\boldsymbol{2\text{Mg} + \text{O}_2}$
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predict the missing component of each reaction. ? + 2nabr → 2nacl + br₂…
First reaction: $\boldsymbol{\text{Cl}_2}$ (from the options: $\boldsymbol{\text{Cl}_2}$) Second reaction: $\boldsymbol{\text{CO}_2 + 2\text{H}_2\text{O}}$ (from the options: $\bo…
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classify each of the following chemical reactions. $\\ce{s + o_{2} \ ig…
for $\boldsymbol{\ce{S + O_{2} ightarrow SO_{2}}}$: synthesis and combustion ### For $\boldsymbol{\ce{2Na_{2}O ightarrow 4Na + O_{2}}}$ (decomposition: AB → A + B, here $\ce{Na_{2…
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use the activity series below to predict the products of each of the fo…
s: - For $\ce{CCl4 + Br2 ->}$: no reaction - For $\ce{FeSO4 + Na ->}$: $\ce{Na2SO4 + Fe}$ (the option is: $\boldsymbol{\ce{Na2SO4 + Fe}}$)
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use the activity series below to predict the products of each of the fo…
C. $Ca_3(PO_4)_2 + Zn$
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separation of mixture* objectives: 1) learn different separation techni…
The purpose of filtration is to separate sand (solid clumps with larger particle size) from the liquid portion (water and dissolved salt, with smaller particle size/molecules) of …
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use the activity series below to predict the products of each of the fo…
no reaction
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use the activity series below to predict the products of each of the fo…
s: - For \( \ce{Na2CO3 + K ightarrow} \): \( \ce{K2CO3 + Na} \) - For \( \ce{ZnCl2 + Cu ightarrow} \): no reaction
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use the activity series below to predict the products of each of the fo…
B. \(K_2CO_3 + Na\) (assuming the second option is labeled as B, if the original options had labels like A, B, C with A being "no reaction", B being \(K_2CO_3 + Na\) and C being \…
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you may have noticed an (s) next to one of the products in some double …
cadmium sulfide
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eplacement reactions given. check to see that the equations are bacl₂ +…
\(BaSO_{4}(s)+MgCl_{2}\) (the last option: \(BaSO_{4}(s)+MgCl_{2}\))
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predict the products of the double replacement reactions given. check t…
B. $\ce{NaNO_3 + AgCl (s)}$
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single replacement reactions given. check to see that the equations are…
\(ZnCl_{2}+H_{2}\) (corresponding to the option " \(ZnCl_{2}+H_{2}\)")
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predict the products for the single replacement reactions given. check …
A. $CaCl_2 + Mg$
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select the description of each substance given by each chemical formula…
One molecule of $\text{O}_3$ is made of three atoms of oxygen The compound $\text{Al}_2\text{O}_3$ is made of two atoms of aluminum and three atoms of oxygen The compound $\text{K…
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what type of reaction is shown below? check all that apply. 2na + cl₂ →…
A. synthesis
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fluorine (f) and bromine (br) are in the same group on the periodic tab…
D. Both a fluorine atom and a bromine atom gain one electron, and both atoms become stable
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what type of reaction is shown below? check all that apply. 2h₂o₂ → 2h₂…
B. decomposition
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what type of reaction is shown below? check all that apply. 2mg+o₂→2mgo…
A. synthesis, C. combustion
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what type of reaction is shown below? check all that apply. $\\ce{c_{10…
combustion (the checkbox next to "combustion" should be selected)
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complete the passage to describe how electrons are represented in elect…
The maximum number of dots an electron dot diagram can have is eight The maximum number of dots drawn on a side of a chemical symbol in an electron dot diagram is two