Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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3. what distinguishes an oxidation - reduction reaction from other type…
Change in electron transfer between species
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2. in a precipitation reaction, what is the primary outcome? options: f…
Formation of an insoluble solid
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1 which of the following is a key characteristic of an acid - base reac…
Transfer of protons (H+ ions)
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7. équilibre les réactions suivantes: a) \\( \\ce{c7h_{12}(l) + o_{2}(g…
a) $\boldsymbol{C_7H_{12}(l) + 10O_2(g) ightarrow 7CO_2(g) + 6H_2O(g)}$ b) $\boldsymbol{2NaOH(aq) + CuCl_2(aq) ightarrow 2NaCl(aq) + Cu(OH)_2(s)}$ c) $\boldsymbol{2AlF_3(aq) + 3Li…
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5 matching 4 points match each database role to its scenario. jessica p…
To solve this, we analyze each scenario and match it to the appropriate database role (assuming common roles like Database Administrator, Read - Only User, User with Data Masking/…
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multiple choice 1 point which statement best explains how president car…
A. It shows the importance of citizens being able to trust in their government to make improvements.
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what was the title of the book that rachel carson wrote that described …
Silent Spring
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date \mother to son\ by langston hughes directions: answer the followin…
1. The poem is in free verse format. We know this because it has no consistent rhyme scheme, fixed meter, or regular stanza structure, and it mimics the natural flow of spoken con…
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fill in the blank 4 points a database choose your answer... refers to a…
export
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electron configuration 12. how many electrons can each level hold? 1st …
12. 1st = 2, 2nd = 8, 3rd = 18 13. Valence electrons 15. - Li: # of P = 3, # of N = 4, # of E = 3 - Ne: # of P = 10, # of N = 10, # of E = 10 - Mg: # of P = 12, # of N = 12, # of …
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can you make a brochure from this information, and or if you can make i…
# Fire Safety: Stay Safe! ## Panel 1: Front Cover **Title**: Fire Safety: Stay Safe! **Image**: [Picture of a fire extinguisher or a safe home scene] **Tagline**: Be Prepared, Be …
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hydrogen peroxide can be used to disinfect and clean surfaces around th…
s: ### Table: - H: 8 - O: 8 ### Number of $\ce{H2O2}$ molecules: 4
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6. what are the reasons that tin is used in alloy metals? (select 2 cor…
B. Tin and niobium create a superconductive alloy — when sufficiently cooled, this material exhibits zero electrical resistance. C. Tin is highly resistant to corrosion and is use…
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how many grams of oxygen gas (o₂) are required to make 8.2 moles of wat…
The mass of oxygen gas required is \(\boldsymbol{655.96\space g}\) (or approximately \(656\space g\))
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nitrogen dioxide is a gas commonly found in polluted air. it is produce…
(for N atoms): 6 ### For the number of O atoms:
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ethanol is a chemical that is used in many hand sanitizers. it is produ…
### Part 1: Completing the table for number of atoms #### Step 1: Calculate number of H atoms - Each ethylene ($\ce{C2H4}$) has 4 H atoms, 3 molecules: $3 \times 4 = 12$ H atoms. …
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sulfuryl chloride is a substance used to make chemicals for killing ins…
### For the table (atoms count): #### Step 1: Analyze Oxygen (O) atoms Each $SO_2$ molecule has 2 O atoms, and there are 3 $SO_2$ molecules. So the number of O atoms is $3\times2 …
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which of the following is a soft metal and the lightest element that is…
D. lithium
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methanol can be used to prevent certain liquids from freezing in cold w…
- H atoms: 12, C atoms: 3, O atoms: 3 - Methanol molecules: 3
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5. we collected h₂ gas at room temperature and pressure. let’s adjust o…
s: 7. Balanced equation: $\boldsymbol{Mg + 2HCl = MgCl_2 + H_2}$; Moles of $H_2$: $\boldsymbol{0.0022\ \text{moles}}$ 8. Volume in mL: $\boldsymbol{22400\ \text{mL}}$; Volume in L…
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acetaldehyde is a substance commonly used in chemical factories. it is …
### Part 1: Completing the table (number of atoms) #### For Hydrogen (H): ## Step1: Calculate H from $C_2H_4$ Each $C_2H_4$ has 4 H atoms. 6 molecules of $C_2H_4$: $6\times4 = 24$…
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23. describe the advantage that infrared waves have over visible light …
Infrared waves can penetrate interstellar dust (which blocks visible light) to observe hidden objects. Many cool celestial objects emit strongly in infrared, enabling study of the…
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which statements describe lattice energy? it is the energy the ions abs…
- It increases as the size of the ions decreases. - It increases as the charge on the ions increases. - It is a measure of the strength of the bonds between ions in a compound.
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in the atmosphere, nitric oxide forms when a lightning strike causes ni…
s: - Number of N atoms: \( \boldsymbol{6} \) - Number of O atoms: \( \boldsymbol{6} \) - Number of NO molecules: \( \boldsymbol{6} \)
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what do these two changes have in common? mixing lettuce and salad dres…
A. Both are only physical changes, B. Both conserve mass
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select the correct answer which compound will precipitate when solution…
D. none
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what do these two changes have in common? salt and vinegar removing tar…
A. Both are chemical changes. C. Both conserve mass.
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select the correct answer. what type of reaction does this chemical equ…
C. exothermic
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select the correct answer. in which state does the precipitate exist in…
C. solid
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select the correct answer. what is the purpose of the arrow in a chemic…
A. It indicates the direction in which the reaction occurs.
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drag each number to the correct location on the equation. each number c…
The balanced equation is $\boldsymbol{\text{SiO}_2 + 4\text{HF} ightarrow \text{SiF}_4 + 2\text{H}_2\text{O}}$ (so we drag 4 to HF, 2 to $\text{H}_2\text{O}$, and 1 (implicit) to …
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evidence 5: the sports page of a local newspaper was found at the scene…
Class It is class evidence because the sports page shares common characteristics (same local paper, same issue date) with the paper at the suspect's home, which can be associated …
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evidence 6: some powder was found in a plastic bag in a suspect’s pocke…
Class It is class evidence because the powder is a common substance that could originate from many sources, not uniquely linked to only the suspect's bag.
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a+bc+dtime (seconds)concentrationa. the reaction reaches equilibrium at…
E. The reaction between A and B is product favored
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a. +1 and -2 b. +3 and -4 c. +3 and -3 d. +1 and -4
A. +1 and -2
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select the correct answer. which compound in this chemical equation ind…
D. Mg(OH)₂
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12 select all the correct answers. which chemical equations show an oxi…
The chemical equations that show an oxidation - reduction reaction are $\boldsymbol{O_2 + 2H_2 ightarrow 2H_2O}$ and $\boldsymbol{2Al + 6HI ightarrow 2AlI_3+3H_2}$.
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select the correct answer. a student carries out this chemical reaction…
C. Cu and ZnCl₂
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select the correct answer from each drop - down menu. a beaker containi…
- Número de colisiones: decrease - Tasa de reacción: decrease
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match each part of the electrochemical cell with its function. reset ne…
- Cathode - reduction - Anode - oxidation - Salt Bridge - ion transport - Wire - electron transport
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select the correct answer. what does an atom gain or lose in an oxidati…
D. electrons
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select the correct answer. what effect does an increase in products hav…
D. The reverse reaction rate increases.
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select the correct answer. which statement is true about a catalyst? a.…
C. A catalyst lowers the activation energy of a reaction.
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select the correct answer from each drop - down menu. in a reversible r…
a constant rate of forward reaction and reverse reaction
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select the correct answer from each drop - down menu. in a reversible r…
simultaneously with
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select the correct answer. a displacement reaction takes place when cal…
A. Zn and \( \text{CaCl}_2 \)
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select the correct answer from each drop - down menu. the reaction betw…
### Parte 1: Tasa de reacción (equilibrio químico) La reacción es exotérmica (produce calor, \( \text{Zn} + 2\text{HCl} ightleftharpoons \text{ZnCl}_2 + \text{H}_2 + \text{heat} \…
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how do tin and aluminum compare to each other? select the proper radio …
- lighter: aluminum (select the radio button under "aluminum" for "lighter") - more resistant to corrosion: aluminum (select the radio button under "aluminum" for "more resistant …
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name: q3 chemistry: u5l3 vsepr theory day 2 practice set 2 4. **cs₂ lew…
### Question 4: $\boldsymbol{\ce{CS2}}$ #### Step 1: Lewis Dot Structure Carbon (C) is central, with 4 valence electrons. Sulfur (S) has 6 valence electrons. In $\ce{CS2}$, C form…
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name: q3 chemistry: u5l3 vsepr theory day 2 date: practice set 2 4. **c…
s: ### 4. $CS_2$ - Lewis Dot Structure: $\boldsymbol{\text{S}::\text{C}::\text{S}}$ (S: 2 lone pairs each, C: 0) - Compound Name: $\boldsymbol{\text{carbon disulfide}}$ - # of ele…
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atomic structure review use a periodic table to help you fill in the ch…
(Key Corrections) - Gallium symbol: \( \boldsymbol{\text{Ga}} \), Mass # \( \boldsymbol{70} \), Neutrons \( \boldsymbol{39} \). - Argon: Element name \( \boldsymbol{\text{Argon}} …
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2 select all the correct answers. based on the reactivities of the elem…
The correct reactions are \( 2\text{LiI} + \text{Cl}_2 ightarrow 2\text{LiCl} + \text{I}_2 \) and \( 2\text{LiBr} + \text{F}_2 ightarrow 2\text{LiF} + \text{Br}_2 \) (correspondin…
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select the correct answer. how does the equilibrium change with the rem…
A. Equilibrium shifts right to produce more product.
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name: date: q3 chemistry: u5l3 vsepr theory day 2 practice set 1 1. **n…
### Problem 1: $\boldsymbol{NF_3}$ #### Step 1: Lewis Dot Structure Nitrogen (N) is central, with 5 valence electrons. Each F has 7 valence electrons. N forms 3 single bonds with …
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use your understanding of the phosphorus cycle to answer the questions …
- For the first (after Step 1) dropdown (Step 2): Animals eat these plants and pass the phosphorus through the food chain (already marked as correct in the image, but for the seco…
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name: ______ q3 chemistry: u5l3 vsepr theory day 2 date: ______ practic…
### Problem 1: $\boldsymbol{NF_3}$ #### Step 1: Lewis Dot Structure Nitrogen (N) is central, with 5 valence electrons. Each Fluorine (F) has 7 valence electrons. N forms 3 single …
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12 a) nomme les composés suivants : i) n₂o ii) coso₄ iii) hno₃ iv) na₂c…
## Part a) Noms des composés: i) Oxyde de sodium ii) Sulfate de cobalt(II) iii) Acide nitrique iv) Citrate de sodium v) Chlorure de plomb(II) vi) Acide hydrosulfurique (ou sulfure…
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name: atomic structure review use a periodic table to help you fill in …
To solve the atomic structure chart, we use the following rules: - Atomic number = number of protons = number of electrons (in neutral atoms). - Mass number = number of protons + …
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select the correct answer. what is the chemical name of the compound ti…
C. titanium(III) oxide
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19 select the correct answer. what is the chemical formula of calcium c…
D. \(CaCl_2\)
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select the correct answer. a scientist discovers a new type of polymer.…
D. It is made of large molecules with repeating units.
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select the correct location on the image. which element has the largest…
Fr (87) (el elemento con símbolo Fr y número atómico 87)
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select the correct answer from each drop - down menu. a potassium ion c…
- Compuesto con enlaces iónicos y covalentes: potassium nitrate - Compuesto con solo enlaces iónicos: potassium chloride
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15 select the correct answer. which element is more reactive than rubid…
B. cesium (Cs)
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1. what is the net ionic equation for the reaction represented by this …
\( \text{Ag}^+_{(aq)} + \text{Cl}^-_{(aq)} ightarrow \text{AgCl}_{(s)} \) (corresponding to the option: \( \text{Ag}^+_{(aq)} + \text{Cl}^-_{(aq)} ightarrow \text{AgCl}_{(s)} \))
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select the correct answer. which structure correctly represents the bon…
D. (The structure with only carbon and hydrogen atoms, including a double bond, representing a hydrocarbon (alkene))
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select the correct answer. an atom of nitrogen has seven electrons. whi…
C. (La opción C muestra la distribución correcta: \(1s\) con dos electrones opuestos, \(2s\) con dos electrones opuestos y \(2p\) con tres electrones en orbitales separados con es…
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select the correct answer. how many electrons does a covalent bond cons…
B. two
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select the correct answer. what is the chemical name of the covalent co…
C. sulfur hexafluoride
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5. which type of reaction is shown by this equation? $2\\ agno_3(aq) + …
A. single replacement
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select the correct answer. which structure represents nonane? a. \\(\\c…
D. La estructura con 9 átomos de carbono en la cadena (correspondiente a la fórmula \( C_9H_{20} \) de nonano)
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drag each tile to the correct image. match each hydrocarbon class to it…
# Explicaciones Breves: 1. **Primera estructura (con \(\ce{-NH2}\))**: Las aminas tienen el grupo funcional \(\ce{-NH2}\) (amino). Esta estructura tiene un grupo amino, por lo que…
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the article states: understanding the body’s biochemical interactions c…
A. explain how understanding the body can lead to making lifestyle changes
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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…