化学
化学反応、化学量論、分子構造、元素の性質。
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when an atom gains or loses a number of electrons, it becomes a charged…
ion
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the electron configuration of element y ends in $s^2p^4$. what is the s…
d. $Y^{2-}$
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you want to approximate the age of a sample of zircon, a mineral that c…
- The half - life of uranium - 235 is 700 million years. - After one half - life, about 8.0 grams of uranium should remain. - After two half - lives, about 4.0 grams of the sample…
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Question was provided via image upload.
$3\text{CO} + \text{Fe}_2\text{O}_3 ightarrow 2\text{Fe} + 3\text{CO}_2$ (The coefficients in order are 3, 1, 2, 3)
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moles → mass given the following, find the number of grams: 9) 4 moles …
$462.36\ \text{g}$ (or ~462 g, depending on sig figs) ### Problem 10: 5.6 moles of $\ce{C_{6}H_{6}}$
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Question was provided via image upload.
7. $\boldsymbol{1\text{Mg(NO}_3\text{)}_2 + 2\text{NaBr} ightarrow 1\text{MgBr}_2 + 2\text{NaNO}_3}$ 8. $\boldsymbol{1\text{H}_2\text{SO}_4 + 2\text{NH}_4\text{OH} ightarrow 2\tex…
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given the following, find the number of moles: 1) 30 grams of h₃po₄ 2) …
$\approx 0.31$ mol (or 0.306 mol) ### Problem 2: 25 grams of $\ce{HF}$
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convert the following particles to moles: 6) 1.02 x 10²⁴ particles of n…
Approximately \( 1.69 \) moles ### Problem 7:
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Question was provided via image upload.
2. $3\text{Ca(OH)}_2 + \text{Al}_2(\text{SO}_4)_3 ightarrow 2\text{Al(OH)}_3 + 3\text{Ca(SO}_4)$ 3. $2\text{NaOH} + \text{H}_2(\text{SO}_4) ightarrow \text{Na}_2(\text{SO}_4) + 2\…
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5. convert 3.44 × 10⁻² kilograms of powdered sugar into tablespoons.
Approximately \(\boldsymbol{3 - 5}\) tablespoons (depending on the conversion factor, a more accurate answer using \(1\) tablespoon \( = 8.33\space g\) of powdered sugar: \(\frac{…
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4. ccl₄ | element | valence electrons | octet | | --- | --- | --- | | |…
### Table Filling: | Element | Valence Electrons | Octet (Needs) | |---------|-------------------|---------------| | C | 4 | 4 | | Cl | 7 | 1 | | Cl | 7 | 1 | | Cl | 7 | 1 | | Cl …
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which of the following is not a pure form of a substance? a. element b.…
d. Mixture
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which of the following is not a characteristic of homogenous mixture? a…
d. Can't be separated physically
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identify the characteristics of a mixture. mark all correct answers □ a…
b. Not a pure form of substance. c. Components can be separated by physical methods. d. May have uniform or non-uniform composition.
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lab activity: fun with fudge overview: everyone loves grandma’s fudge. …
\( \boldsymbol{1} \) tsp of Milk ### Problem 3: Convert \( 1.71 \times 10^{-1} \) teaspoons of vanilla into drops.
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which of the following are not examples of molecules? mark all correct …
a. NaCl
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chemistry act & wkst: lewis structures for molecules. lewis structure –…
1. $NCl_3$ (completed): central atom: N; shared pairs: 3; unshared pairs: 1 2. $CF_2Cl_2$: central atom: C; shared pairs: 4; unshared pairs: 0 Lewis structure: $\ce{Cl-C(Cl)(F)-F}…
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3) move the fasteners to form a covalent bond between hydrogen and fluo…
### HF Questions: a) Lewis Dot Structure: $\ce{H:}\!\!\!\!\underset{\Large\sdot\sdot}{\overset{\Large\sdot\sdot}{\ce{F}}}\!\!\!\!:$ b) Hydrogen cannot stably lose its only electro…
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compound #1 - elemental fluorine (f₂) 1) cut out 2 fluorine (f) atoms. …
### Compound #1 (F₂) a) Lewis Dot Structure: $\ce{:F-F:}$ (each F has 3 additional pairs of dots, so full structure is $\ce{: \underset{\cdot \cdot}{F} - \underset{\cdot \cdot}{F}…
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7. when discussing and analyzing a sonnet, what is the first step a rea…
Identify the rhyme scheme to determine the type of sonnet.
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6. what is the main difference between haiku and free verse poetry? the…
the structure
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which of the following happen during this change of state? select all t…
- The substance melts and becomes a liquid. - The particles in the substance move far apart.
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look at the models and the table below. they show different chemical bo…
- the combination of atoms - the combination of bonds - the arrangement of atoms
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what happens when you heat a liquid? the particles begin to slide past …
- The substance gains thermal energy. - The substance vaporizes and becomes a gas.
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step 2: balance carbon (c) atoms on both sides. leave hydrogen and oxyg…
Balanced equation: \( \boldsymbol{\ce{C2H4 + 3O2 -> 2CO2 + 2H2O}} \) Atom counts (left/right): C: 2/2, H: 4/4, O: 6/6
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11. you have conductivity meters in 1 m solutions of hno₃, hno₂, and hc…
The order of acid strength from strongest to weakest is \(\boldsymbol{\text{HNO}_3 > \text{HNO}_2 > \text{HC}_2\text{H}_3\text{O}_2}\)
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which statement is true? (1 point) ○ organic material will not decompos…
Composting speeds up the decomposition of organic material
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chemistry act & wkst: lewis structures for molecules. lewis structure –…
1. $NCl_3$ (completed): central atom: N; shared pairs: 3; unshared pairs: 1 2. $CF_2Cl_2$: central atom: C; shared pairs: 4; unshared pairs: 0 Lewis structure: $\ce{Cl-C(Cl)(F)-F}…
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3) move the fasteners to form a covalent bond between hydrogen and fluo…
### HF Questions: a) Lewis Dot Structure: $\ce{H:}\!\!\!\!\underset{\Large\sdot\sdot}{\overset{\Large\sdot\sdot}{\ce{F}}}\!\!\!\!:$ b) Hydrogen cannot stably lose its only electro…
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compound #1 - elemental fluorine (f₂) 1) cut out 2 fluorine (f) atoms. …
### Compound #1 (F₂) a) Lewis Dot Structure: $\ce{:F-F:}$ (each F has 3 additional pairs of dots, so full structure is $\ce{: \underset{\cdot \cdot}{F} - \underset{\cdot \cdot}{F}…
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7. when discussing and analyzing a sonnet, what is the first step a rea…
Identify the rhyme scheme to determine the type of sonnet.
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6. what is the main difference between haiku and free verse poetry? the…
the structure
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which of the following happen during this change of state? select all t…
- The substance melts and becomes a liquid. - The particles in the substance move far apart.
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look at the models and the table below. they show different chemical bo…
- the combination of atoms - the combination of bonds - the arrangement of atoms
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what happens when you heat a liquid? the particles begin to slide past …
- The substance gains thermal energy. - The substance vaporizes and becomes a gas.
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step 2: balance carbon (c) atoms on both sides. leave hydrogen and oxyg…
Balanced equation: \( \boldsymbol{\ce{C2H4 + 3O2 -> 2CO2 + 2H2O}} \) Atom counts (left/right): C: 2/2, H: 4/4, O: 6/6
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11. you have conductivity meters in 1 m solutions of hno₃, hno₂, and hc…
The order of acid strength from strongest to weakest is \(\boldsymbol{\text{HNO}_3 > \text{HNO}_2 > \text{HC}_2\text{H}_3\text{O}_2}\)
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which statement is true? (1 point) ○ organic material will not decompos…
Composting speeds up the decomposition of organic material
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balance the chemical equation using the smallest possible whole number …
$\boldsymbol{\square} \text{N}_{2(g)} + \boldsymbol{\square} \text{O}_{2(g)} ightarrow \boldsymbol{2} \text{NO}_{(g)}$ (Se dejan vacíos los primeros dos recuadros, ya que su coefi…
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balance the chemical equation using the smallest possible whole number …
$\text{N}_2(g) + \text{O}_2(g) ightarrow 2\text{NO}(g)$ (Coeficientes: Espacio vacío para $\text{N}_2$, espacio vacío para $\text{O}_2$, 2 para $\text{NO}$)
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balance the chemical equation using the smallest possible whole number …
$\text{N}_2(g) + \text{O}_2(g) ightarrow 2\text{NO}(g)$ (Coeficientes: Espacio vacío para $\text{N}_2$, espacio vacío para $\text{O}_2$, 2 para $\text{NO}$)
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balance the chemical equation using the smallest possible whole number …
La ecuación balanceada es: $\boldsymbol{\text{Co}_{(s)} + \text{NiCl}_{2(aq)} ightarrow \text{CoCl}_{2(aq)} + \text{Ni}_{(s)}}$ Los coeficientes (en orden) son: (vacío/1), (vacío/…
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balance the chemical equation using the smallest possible whole number …
$\text{CH}_3\text{OH}_{(l)} ightarrow \text{CO}_{(g)} + 2\text{H}_{2(g)}$ (Coeficientes: 1 (vacío para $\text{CH}_3\text{OH}$), 1 (vacío para $\text{CO}$), 2 para $\text{H}_2$)
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formula: name: cobalt (iii) fluoride formula: name: carbon disulfide fo…
s: - Cobalt (III) fluoride: \( \text{CoF}_3 \) - Carbon disulfide: \( \text{CS}_2 \) - Potassium sulfide: \( \text{K}_2\text{S} \) - \( \text{CH}_4 \): Methane
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what is the definition of the word synthesis as it relates to research …
combining information from various sources to create an insightful analysis
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balance the chemical equation using the smallest possible whole number …
Para \( N_2 \): 1; Para \( O_2 \): 2; Para \( NO_2 \): 2
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balance the chemical equation using the smallest possible whole number …
Coeficiente de \( \text{H}_2\text{O} \): 2, Coeficiente de \( \text{H}_2 \): 2, Coeficiente de \( \text{O}_2 \): 1 (Si la ecuación es \( 2\text{H}_2\text{O} ightarrow 2\text{H}_2 …
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balance the chemical equation using the smallest possible whole number …
1 (para FeS), 2 (para HCl), 1 (para FeCl₂), 1 (para H₂S) En la forma de rellenar los espacios: - Primer espacio (FeS): 1 - Segundo espacio (HCl): 2 - Tercer espacio (FeCl₂): 1 - C…
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balance the chemical equation using the smallest possible whole number …
1 (para $\ce{FeS}$), 2 (para $\ce{HCl}$), 1 (para $\ce{FeCl2}$), 1 (para $\ce{H2S}$)
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balance the chemical equation using the smallest possible whole number …
Para \( \text{HI}(g) \): 2 Para \( \text{H}_2(g) \): 1 (o en blanco) Para \( \text{I}_2(g) \): 1 (o en blanco) (En el orden de los espacios en la imagen: el primer cuadro (HI) es …
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part c: true (t) or false (f) 1. changing the size and shapes of pieces…
To solve these true - false questions, we analyze each one based on the definitions of physical and chemical changes. A physical change is a change in the form or appearance of a …
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something looks, but havent made a new substance, a physical change (p)…
To solve this, we determine if each change is physical (P, no new substance) or chemical (C, new substance): ### 1. An ice cube in the sun - Ice melts to water (same substance, st…
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physical change 1. a change in size, shape, or state 2. no new substanc…
P ### 2. Ag (Silver) tarnishes. Step: Tarnishing forms silver sulfide (new substance).
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physical and chemical properties and changes name physical property 1. …
### Part A (Identifying Physical (P) or Chemical (C) Changes) #### 1. An ice cube is placed in the sun... - **Explanation**: Ice melts to water (state change) and water evaporates…
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2 how does the passage compare satellites to instruments like telescope…
B. Satellites see larger areas of Earth at one time and can see into space better than telescopes.
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atom reading and questions. answer the questions on a separate sheet of…
Atoms are the basic units of matter that make up all the space in the universe. The idea of atoms was first suggested in 440 B.C., and they are composed of protons, neutrons, and …
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a charged object, like an ion, can exert an electric force on another o…
The electric force causes them to attract.
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an atom can become an ion by losing electrons to or gaining electrons f…
Sodium \(\boldsymbol{\text{loses}}\) an electron, and chlorine \(\boldsymbol{\text{gains}}\) an electron. So the sodium atom becomes a \(\boldsymbol{\text{positively}}\) charged i…
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4. ____koh → ____k₂o + ____h₂o 5. ____mg + ____h₂o → ____mg(oh)₂ + ____…
4. $2\text{KOH} ightarrow \text{K}_2\text{O} + \text{H}_2\text{O}$ 5. $\text{Mg} + 2\text{H}_2\text{O} ightarrow \text{Mg(OH)}_2 + \text{H}_2$ 6. $\text{K}_3\text{PO}_4 + 3\text{H…
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fill in the blank 6 points volume is the amount of space an object take…
Pregunta 2: liters Pregunta 3: grams
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8. how many kilograms of calcium are there in 173 pounds of calcium? (1…
78.5 kg ### Question 9
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counting atoms and calculating molar mass 12. aluminum sulfate - al₂(so…
Since the problem is about counting atoms and calculating molar mass, let's take an example, say problem 12: Aluminum sulfate - $\ce{Al2(SO4)3}$. ### Step-by-Step Explanation for …
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possible points: 4 using the graph below, identify two liquids—one with…
- Highest density liquid: Mercury (density = 13.60 g/mL), determined by its being the tallest bar on the graph. - Lowest density liquid: Liquid Hydrogen (density = 0.07 g/mL), det…
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name: endothermic/exothermic reactions exit ticket date: students were …
- Correct student: Student B - Reaction type: Endothermic - Support: The energy graph shows products have higher potential energy than reactants, with $\Delta H > 0$. This means t…
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name: ______ period: ______ counting atoms and calculating molar mass p…
### Part 1: Counting Atoms #### For $\boldsymbol{\ce{NaOH}}$: ## Step 1: Identify elements and counts - $\ce{Na}$: 1 atom (no subscript, so 1) - $\ce{O}$: 1 atom (subscript 1 in $…
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what makes an acid unique and how are acids named? why? a variety of ac…
For HBr: Cation is $\boldsymbol{H_3O^+}$, Anion is $\boldsymbol{Br^-}$; For HF: Cation is $\boldsymbol{H_3O^+}$, Anion is $\boldsymbol{F^-}$ (or the filled table as above).
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why study earth science? to increase biodiversity to predict severe wea…
○ to predict severe weather events
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question 29 of 49 other structure. resonance structure 1: h₃c - n = c =…
### Curved arrows on Resonance Structure 1: 1. A curved arrow originating from one of the lone pairs on the oxygen atom, pointing towards the carbon-oxygen bond (to form a double …
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you will next be reading from the truth about drugs booklet. before you…
The beliefs and activities that are common to members of a group
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calculate the number of moles in each of the following masses: 6. how m…
Approximately $28.0\ g$ (or $28\ g$) of sodium. ### Problem 7:
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consider the incomplete structure shown. draw an alternative lewis (res…
The resonance structure is: ``` H | H - C ≡ N - H | H ``` With a -1 formal charge on the carbon atom and a +1 formal charge on the nitrogen atom; the nitrogen atom has one unshare…
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question 31 of 49 structure 3: draw the structure with a positively cha…
The positively charged carbon structure is: ``` H₃C | H₃C-N-C⁺(O-CH₃) | (removed O-CH₃) ``` Or visually, a central carbon with three bonds: one to N(CH₃)₂, one to O-CH₃, and no fo…
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8. 8.76 g of sodium sulfide is added to 350 ml of 0.250 mol/l lead(ii) …
20.9 g
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8. 8.76 g of sodium sulfide is added to 350 ml of 0.250 mol/l lead(ii) …
$\ce{Al(NO3)3 + 3NaOH -> Al(OH)3(s) + 3NaNO3}$ ### Part (b)
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forever chemicals diagram analyze it: 1. name one consumer product that…
1. One consumer product is non-stick cookware (e.g., Teflon-coated pans). PFAS are used to create a heat-stable, non-stick surface that repels food and resists damage. 2. PFAS per…
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6. artificial sources of water include a. aquifers. b. aqueducts. c. sp…
b. aqueducts ### Question 7
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a solution is 29.36% m/v. what is the mass of dissolved solid in 125 ml…
36.7 g --- ### Second Question
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a student dissolved 0.515 mol of magnesium chloride in enough water to …
1. 2.29 mol/L 2. 0.75 mg
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seawater has ph of 8.0. what is the hydrogen ion concentration? 2 x 10^…
1. B. $1 \times 10^{-8}\ \text{mol/L}$ 2. D. $4.58\ \text{mol/L}$ 3. A. $500\ \text{mL}$
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concentration of iodide ions? 0.25 mol/l calcium iodide or 0.45 mol/l p…
1. calcium iodide 2. 12 3. a concentrated weak acid
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lesson 13.1: true or false name_______________ class_____________ date_…
False ### Question 2
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ground state vs excited state electrons background neils bohr was the s…
### 1) Completed Table: | Electron Configuration | Identity (count electrons) | Ground/Excited | |------------------------|----------------------------|----------------| | 1) 2-8-…
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12) what volume would be occupied by 4.8 g of oxygen gas at 0.50 atm an…
12) $\approx 10.0\ \text{L}$ 13) $2.00\ \text{M}$ 14) $\approx 8.56\ \text{L}$ 15) $2\text{NaOH(aq)} + \text{MgCl}_2\text{(aq)} ightarrow \text{Mg(OH)}_2\text{(s)} + 2\text{NaCl(a…
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which type(s) of molecule(s) are non - polar solvents more likely to be…
non-polar molecules
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introduction: chemical equations show how compounds and elements react …
1. B. Decomposition 2. E. Combustion 3. A. Synthesis 4. D. Double Replacement 5. C. Single Replacement ### Part 2: Balancing and Classifying #### A. \(AgNO_3 + KCl ightarrow AgCl …
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what is the difference between a strong acid and a weak acid? a strong …
B. A strong acid completely dissociates in water. C. A strong acid completely ionizes in water. --- ### Second Question:
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solutions with which of the following molar concentrations are consider…
1. 0.1 mol/L or less 2. saturated
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which of the following is the correct dissociation reaction for calcium…
1. $\text{Ca(OH)}2(\text{s}) ightarrow \text{Ca}2+(\text{aq}) + 2\text{OH}-(\text{aq})$ 2. ionization 3. partially reacts with water to form $\text{OH}-(\text{aq})$
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in what section of an msds would you find the recommended fire extingui…
B. Section 5 (assuming the options are labeled as A. Section 6, B. Section 5, C. Section 1, D. Section 2)
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activity a: balancing equations\ run the gizmo: first\ - check that the…
$\boldsymbol{2}\ \ce{H2 + 1\ O2 -> 2\ H2O}$ ### 2. Balancing $\boldsymbol{\ce{Al + HCl -> AlCl3 + H2}}$
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dilution of an acid solution lowers the ph. * true false which piece of…
1. False 2. volumetric flask 3. gasoline
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adding water to a solution increases the solutions concentration. true …
1. False 2. False 3. concentration of H+(aq) ions 4. False
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which of the following is not a solution? * oxygen in water sand in wat…
1. sand in water 2. True 3. negative oxygen ends
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what section of an msds provides the phone number(s) for contacting the…
C. Section 1 (Note: Assuming the options are labeled as A. Section 6, B. Section 2, C. Section 1, D. Section 5. If the original option labels differ, adjust accordingly, but based…
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3. how many atoms of iron are in 72.5 grams? 4. how many formula units …
Approximately $7.82\times10^{23}$ atoms of iron. ### Problem 4: How many formula units of $\text{Al(NO}_3\text{)}_3$ are in 0.360 moles?
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part a what can you conclude about the most precious metal? the most pr…
B. The idea of what is the most precious metal has changed over time.
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molar conversion practice 1 mole of sodium atoms = ______ atoms nole of…
\( 1.8 \times 10^{24} \) atoms (or \( 1.8066 \times 10^{24} \) atoms) #### 2. In 27.0 grams of lithium, how many atoms are there?
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3. how many grams are in of 4.50 moles of barium sulfide? 4. how many f…
\( 762.3 \, \text{grams} \) (or \( 762 \, \text{g} \) if rounded to three significant figures) ### Problem 4: How many formula units are there in 5.39 moles of silver chloride?
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select three pieces of evidence in the passage that suggest that count …
- "Stay here, and worry not. I'll return at dawn. I will bring back a gift of peace." - "The count stared in horror at the sword and said, 'Was anyone hurt?'" - "He softened and s…
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unbalanced force: forces are unequal, causing some change in the motion…
To solve this matching problem for Unit 3: The Atom, we analyze each definition and match it with the correct term from the word bank: ### 1. "Anything that has mass and takes up …