化学
化学反応、化学量論、分子構造、元素の性質。
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name: date: period: homework: intensive and extensive properties 1. whi…
Extensive properties are based on the size of a sample. ### Question 2
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1. which set of properties, intensive or extensive, are based on the si…
Extensive properties are based on the size of a sample.
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complete the rhyme scheme. a a b b c the great bare tree looked down an…
1. A 2. B 3. A 4. B 5. C
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complete the rhyme scheme. a b b c c \who planted this old apple - tree…
1. A 2. B 3. A 4. B 5. B
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complete the rhyme scheme. a b b c i had not known before forever was s…
1. I had not known before: A 2. Forever was so long a word: B 3. The slow stroke of the clock of time: C 4. I had not heard: B
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unit 3: atomic structure 16. if an atom has 23 electrons and an atomic …
a) 23 b) 28 c) Vanadium (V) d) Isotope symbol: $\ce{^{51}_{23}V}$; Isotope name: Vanadium-51 --- ### Problem 17
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give the element symbol for the atom pictured below. symbol protons: ne…
$\text{H}$
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give the element symbol for the atom pictured below. symbol protons: ne…
Li
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give the element symbol for the atom pictured below. symbol protons: ne…
Li
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activity: practice balancing chemical equations balance the equations a…
1) Balanced equation: $\boldsymbol{1\text{N}_2 + 3\text{H}_2 \longrightarrow 2\text{NH}_3}$; Reaction type: **Synthesis (Combination)** 2) Balanced equation: $\boldsymbol{2\text{N…
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Question was provided via image upload.
s: 1. i. Cu 2. g. Bi 3. h. Nd 4. j. B 5. f. Fr 6. e. Pt 7. c. K 8. a. Cf 9. d. Ge 10. b. Db
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13. match the item with the best unit for its measurement. a. coin’s wi…
a. 3. mm b. 1. km c. 4. M d. 2. cm --- ### Question 14
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answer the questions based on the data from the video lab. 1) for every…
1) 2 units 2) $\ce{2H_{2}(g) + O_{2}(g) -> 2H_{2}O(l)}$ 3) $\ce{2H_{2}O(l) -> 2H_{2}(g) + O_{2}(g)}$ (electrolysis) 4) They move to the negative cathode electrode. 5) They move to…
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as the temperature of an environment increases, the rate of chemical we…
C. increase
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answer the questions based on the data from the video lab. 1) for every…
1. 2 units of hydrogen gas 2. $2H_2(g) + O_2(g) ightarrow 2H_2O(l)$ 3. $2H_2O(l) ightarrow 2H_2(g) + O_2(g)$ (electrolysis of water) 4. Hydrogen ions move to the cathode (negative…
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in the ppm lab, the dilution began with (beaker 1) at a 10/10 concentra…
100% concentration
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concentrations can be expressed as a ratio. for example, if a solution …
1:100
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4. natural gas burns on a stove to heat food. type of change: explanati…
Type of change: Chemical change
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10. what kind of material is found in the c horizon of a soil profile? …
The option with "partially weathered parent material" (the right - most option among the four visible options in the image).
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part 3: sorting real - world changes place each situation in the correc…
### Physical Changes: - Ice melting in a cup - Crushing a can - Evaporation of rubbing alcohol ### Chemical Changes: - Photosynthesis in a plant - Food spoiling - Combustion of ga…
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part 3: sorting real - world changes place each situation in the correc…
### Physical Changes: - Ice melting in a cup - Crushing a can - Evaporation of rubbing alcohol ### Chemical Changes: - Photosynthesis in a plant - Food spoiling - Combustion of ga…
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3. co₂(s)→co₂(g) type of change:
Sublimation (or Physical Change - Sublimation)
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2. zn(s) + hcl(aq) → zncl₂(aq) + h₂(g) type of change: ______ 3. co₂(s)…
Chemical change (specifically single - displacement reaction) ### Question 3:
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7 fill in the blanks to complete the sentences. not all the words will …
### First Sentence: - The first blank: The Sun emits "energy" (in the form of electromagnetic radiation) that travels to Earth. So the first blank is "energy". - The second blank:…
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part 2: using chemical formulas as evidence for each change below: - de…
Type of change: Physical change
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5 which statement supports the idea that water molecules in ocean waves…
A. Ocean waves move in a transverse pattern (Note: There seems to be an issue as only this option supports the idea among the given ones, but the question asks to choose two. Mayb…
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part 2: using chemical formulas as evidence for each change below: - de…
Physical change (because the chemical formula remains $\ce{H2O}$, only the phase changes from liquid to gas, no new substance is formed). ### 2. Analysis for $\boldsymbol{\ce{Zn(s…
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1 what happens to a molecule after it passes energy on to the next mole…
C. It returns to its original resting position
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question 7 (3 points) you receive an order for 125 ml of 4% acetic acid…
\( 6.7 \)
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1. a puddle of rainwater slowly disappears on a warm sidewalk. type of …
Type of change: Physical change
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when are parts per million and parts per billion used as measurements? …
When measuring concentrations that are smaller than 1%
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in the 1970s, what element was removed as an additive from gasoline? zi…
lead (the option corresponding to "lead" among the choices)
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in the 1970s, what element was removed as an additive from gasoline? zi…
C. lead
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the molecular formula is $\\ce{c6h12o6}$ because one molecule actually …
| Formula | Numbers of atoms | |---------|------------------| | $\text{CaCl}_2$ | $\text{Ca}=1; \text{Cl}=2$ | | $\text{CO}_2$ | $\text{C}=1; \text{O}=2$ | | $\text{H}_2\text{O}$ …
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2. a bicycle left outside develops rust after several weeks. type of ch…
Type of change: Chemical change
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classify the following compounds as ionic, or covalent hint: if the fir…
| Formula | Type of Compound | Formula | Type of Compound | |-----------|------------------|-----------|------------------| | $CaCl_2$ | Ionic | $MgO$ | Ionic | | $CO_2$ | Covalen…
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______ is a deadly, colorless, odorless gas that is a by-product of inc…
D. Carbon Monoxide
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which of the following forms an acid in the atmosphere? nitrogen oxides…
A. nitrogen oxides
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part 1: analyze the scenario for each situation below: - decide whether…
### Type of change: Physical change (specifically a phase change - evaporation) ### Explanation: When a puddle of rainwater disappears on a warm sidewalk, the water is undergoing …
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part 1: analyze the scenario for each situation below: - decide whether…
Type of change: Physical change
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gas → liquid solid → liquid are changes in state of matter physical or …
s: 1. P 2. P 3. C 4. P 5. P 6. C 7. C 8. C 9. P 10. P 11. P 12. C
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1. the quantity of work equal to one joule is also equivalent to which …
c. (watts)(s) ### Question 2
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decide if the following are physical (p) or chemical (c) changes: _____…
s: 1. C 2. P 3. C 4. P 5. P 6. C 7. P 8. C 9. P 10. P 11. P 12. C 13. C 14. P (if the last is about melting metal)
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what contributes to the high level of biodiversity found in wetlands? a…
d. all of the above
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homework: physical and chemical changes decide if the following are phy…
chemical ### 2. Condensation of water: $\ce{H_{2}O_{(g)} -> H_{2}O_{(l)}}$ Only state (gas to liquid) changes, no new substance.
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introduce a famous person who inspires you and use a colon to quote som…
"Marie Curie, the groundbreaking physicist and chemist who broke barriers for women in science: 'Nothing in life is to be feared, it is only to be understood. Now is the time to u…
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secondary pollutants are produced when primary pollutants are released …
B. photochemical smog
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secondary pollutants are produced when primary pollutants are released …
B. photochemical smog (assuming the options are labeled as A. oxygen, B. photochemical smog, C. carbon, D. nitrogen)
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ion is widely added to local water supplies to help prevent tooth decay.
Fluoride
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how many electrons are in a fluorine ion, f⁻? enter the answer check it
10
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choose the examples for anions with names, charges and chemical symbols…
a. Bromide, $Br^-$ b. Chloride, $Cl^-$ d. Oxide, $O^{2-}$
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a negative ion formed when a nonmetal gains one or more electrons is kn…
anion
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which of the following elements will form +4 ions? a gallium b calcium …
c. Germanium
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how does the number of protons compare to the number of electrons in a …
b. There are more protons than electrons.
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(molar mass of o₂ = 32.00 g/mol) 6. how many particles are in 11.2 l of…
$3.011\times 10^{23}$ particles ### Question 7
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particles to volume and mass 7. what volume (in liters) does 1.8066 × 1…
The mass of \( 3.011 \times 10^{23} \) particles of neon gas is \( \boldsymbol{10.09} \) grams.
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the redox reaction given below occurs in basic solution.\\(\\ce{tco^-_{…
2
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valence electrons & energy levels name ______________________ period __…
| Element | number of valence electrons | number of energy levels used | |---------|------------------------------|-------------------------------| | H | 1 | 1 | | Na | 1 | 2 | | …
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restoration: ased on the data you have collected, who is guilty of degr…
The Factory, The Power Plant, Big Sky Ranch
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ecodetectives: peril river restoration: based on the data you have coll…
The Factory, The Power Plant, Big Sky Ranch, Paradise Organic Farm (select the checkboxes for these entities).
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determine the percentage composition of manganese (mn) in kmno₄. find t…
The percentage composition of manganese (Mn) in \(KMnO_4\) is approximately 34.76%. ### Filling the boxes: - For K: \(39.098\) (atomic mass) \(\times\) \(1\) (number of atoms) \(=…
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a coin contains 0.253 moles of silver (ag). how many silver (ag) atoms …
The number of silver atoms in the coin is \( \boldsymbol{1.52 \times 10^{23}} \) (when calculated as \( 0.253 \, \text{mol} \times 6.02 \times 10^{23} \, \text{atoms/mol} \)).
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4 c. aluminum-27 (atomic number = 13) 4. although electrons have mass, …
1. (For question 4) Electrons are excluded because their mass is negligible compared to protons and neutrons. 2. (For question 5) No, the atom is not neutrally charged; it has a +…
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how many moles of ca(co₃) - (calcium carbonate) are present in a 135.20…
The number of moles of \( \text{Ca(CO}_3\text{)} \) is \( 1.35 \) moles (or more precisely, using the given molar mass approximation \( \frac{135.20}{100.09}\approx1.35 \)). Filli…
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3 use a periodic table of the elements to answer these questions. 1. th…
1. | What the nucleus looks like | What is this element? | How many electrons does the neutral atom have? | What is the mass number? | |------------------------------|------------…
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3 use a periodic table of the elements to answer these questions. 1. th…
### Question 1 (Table Filling) #### Row 1 (First Nucleus) ## Step1: Count Protons and Neutrons Protons (P) = 3, Neutrons (N) = 4. Atomic number = number of protons = 3. So the ele…
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how many molecules are there in 3.36 grams of $nh_3$? calculate the mol…
\( 1.18 \times 10^{23} \) molecules of \( NH_3 \)
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practicing ionic bonding i. writing lewis dot structures a. for each of…
### Part I.a: Writing Lewis Dot Structures for Elements #### Element: Li (Lithium) ## Step 1: Electron Configuration Lithium has an atomic number of 3. The electron configuration …
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mark the following statements as true or false. once text is erased, th…
s: - "Once text is erased, there is no way to see what was written there.": False - "There is no way to detect chemical erasure.": False - "Physical abrasion erasure can be detect…
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2 carbon has three isotopes: carbon - 12, carbon - 13, and carbon - 14.…
6 protons ### Part b
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which of the following can be removed by using light at various wavelen…
D. Obliterations
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c. determine what charge the following elements would form if they beca…
### Part c: Determine Ion Charges To determine the charge of each element when forming ions, we use their group number (for main - group elements) or common oxidation states: - **…
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find the % composition of n and h in nh₃ n blank / blank × 100 = blank …
For N: \(\frac{14.007\ \text{g/mol}}{17.031\ \text{g/mol}} \times 100 = 82.24\%\) For H: \(\frac{3.024\ \text{g/mol}}{17.031\ \text{g/mol}} \times 100 = 17.76\%\)
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how many grams are there in $5.52 \\times 10^{23}$ molecules of $\\ce{n…
The mass of \(5.52\times 10^{23}\) molecules of \(NH_3\) is approximately \(15.62\space g\)
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what is the empirical formula of a chemical with a molecular formula of…
The empirical formula is \( CH \).
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exam 7: moles what is the molar mass of kcl ? keep two places after the…
74.55
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question 13 (1 point) listen which of the following statements is true …
1. Question 13: The client believes the placebo to be effective in pain management. 2. Question 14: Steroids. 3. Question 15: Sarcomas.
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indicate which of the following chemical formulas are empirical or mole…
To determine if a chemical formula is empirical or molecular, we use the following definitions: - **Empirical Formula**: The simplest whole - number ratio of atoms in a compound. …
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match the following words with their correct description avogadros numb…
- Avogadro’s number: \( 6.02 \times 10^{23} \) - particles: atoms, molecules, or formula units - where to find molar mass: periodic table (atomic masses) - molar mass unit: gram/m…
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question 4 (1 point) listen the freezing of a malignancy with a liquid …
1. Question 4: Cryosurgery. 2. Question 5: In situ/benign. 3. Question 6: Is performed to sustain cancer clients and alleviate pain.
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using the set up below, correctly convert 50.0 g of phosphorus (p) into…
First box: 50.0 g P Second fraction numerator: 1 mol P Second fraction denominator: 30.974 g P Result: 1.61 moles P So the setup is \(\frac{50.0\ \text{g P}}{1} \times \frac{1\ \t…
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a diamond is a crystallized carbon (c), known for its extreme hardness,…
Element
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during a lab experiment, john accidentally overheated a penny, causing …
homogeneous mixture
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7) choose the best answer. which mnemonic device is used to help people…
7) OIL RIG 8) yes 9) no
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part a: sentences. use your knowledge of the stems and context clues to…
introvert ### Question 27
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3) choose the best answer. ____ is the process in which an atom or ion …
3) Oxidation 4) Reduction 5) oxidizing 6) reducing
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15. what is the rhyme scheme of the poem? * 1 point a. aaaabbbbb b. aba…
b. ABAB CDCD ### Question 16
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what is the weakest reducing agent? \ options: $\\ce{no_3^-}$, $\\ce{cl…
D. Mn²⁺
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what is the strongest oxidizing agent? oxidizing agents: f₂, o₂, mno₄⁻,…
$\text{MnO}_2$
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10) check the box if the phrase or equation describes an acid-base, pre…
1. $\boldsymbol{\text{NaCl}(aq) + \text{AgNO}_3(aq) ightarrow \text{NaNO}_3(aq) + \text{AgCl}(s)}$: Check **Precipitation Reaction** box 2. $\boldsymbol{4\text{Al}(s) + 3\text{O}_…
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20. what is the mass of 2.0 moles of carbon (c)?
The mass of 2.0 moles of carbon is \(24\space g\).
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19. what is the empirical formula of the compound with the molecular fo…
The empirical formula is \(CH_{2}\)
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18. use your scratch paper to work the rr track for this problem: how m…
\( 2.2 \)
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17. use your scratch paper to draw out the rr track for this problem: h…
51.3 grams
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16. which of the following shows the correct number of atoms of each el…
1 magnesium atom, 2 nitrogen atoms, and 6 oxygen atoms (the first option)
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15. what is the percent composition of magnesium (mg) in mgbr₂? 0.132 %…
13.20 % Mg (corresponding to the option "13.20 % Mg")
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14. which of the following has the greatest mass (in grams)? one mole o…
one mole of \(H_2SO_4\)
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part 4: sentences. use your knowledge of the stems and context clues to…
introvert ### Question 27
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13. what is the mass of 1.0000 moles of ca(oh)₂?
The mass of 1.0000 moles of $\ce{Ca(OH)2}$ is $\boldsymbol{74.096\ g}$ (or can be rounded appropriately, e.g., 74.10 g depending on precision needs).
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12. vanillin (vanilla flavoring) has the structure below vanillin what …
The molecular formula of Vanillin is $\boldsymbol{C_8H_8O_3}$