化學
化學反應、化學計量、分子結構與元素性質。
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complete the following table. draw arrows between the lewis dot structu…
| Category | Potassium | Fluorine | Selenium | Calcium | |----------|-----------|----------|----------|---------| | Group A# | IA | VIIA | VIA | IIA | | # Valence Electrons | 1 | …
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of weathered bedrock. p. 165 6. ______________you can use the ph scale …
B. B horizon ### Question 8
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question 8 based on the article, which of these is true? a. highly reac…
D. Highly reactive metals are on the left side of the periodic table.
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which of the following statements most accurately defines clarissa dall…
She is a wealthy woman who can afford a nice house, a servant, and catering. ### Question 6 (Solemnity - Likely Situation)
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6. what are the products of the chemical equation to make a balanced ch…
c. $\ce{2 HNO2 + 1 Na2SO4}$
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4. what are the products of the chemical equation to make a balanced ch…
b. $2\text{H}_2\text{O}_2$
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one student claims that the meaning of this balanced equation is \2 gra…
Disagree. Coefficients represent mole/particle ratios, not mass ratios. The correct mass relationship is 4 g $\text{H}_2$ reacts with 32 g $\text{O}_2$ to form 36 g $\text{H}_2\te…
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2. what would increase the temperature during a chemical reaction? a. t…
2. c. The collision rate of the reactant particles increased. 3. b. The molecules move faster as a gas than they do as a liquid.
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1254 grams of sodium chloride is combined with 2158 grams of barium pho…
Approximately $\boldsymbol{1173\space g}$ (or more precise value around 1172 - 1173 g) ### 2. Limiting Reactant
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22. a puddle left in the sunlight disappears after a couple hours 23. i…
Evaporation (Liquid → Gas) ### 23. Icicles forming on a tree at night
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using the formula provided, convert kelvin to celsius #°k - 273.15 step…
1. Phase Change: Melting 2. Molecular Movement: - Before: Molecules are moving (vibrating) in place (solid state). - After: Molecules are moving around each other (liquid state). …
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depression and anxiety: test : _______________________________ score: _…
s (Part 1 - Classifications, Part 2 - Blanks) 1. Both 2. Both 3. Both 4. Both (or A) 5. Both 6. Both 7. Both 8. Both (or A) 9. depression 10. medication 11. anxiety 12. goodbye 13…
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using the formula provided, convert kelvin to celsius #°k - 273.15 \t s…
\( 0^\circ\text{C} \) ### Question 18: Convert 773.15 K to Celsius
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parts of a pot number correct: ______/4 mouth. 1. this is the part of t…
### Glaze Matching: 1. Matte Glaze- A type of glaze which creates a flat/dull coating on a clay surface. 2. Underglaze- Glass-forming chemicals, usually with coloring compounds ad…
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selenium-50 selenium-55 # of protons # of neutrons # of electrons sodiu…
### Sodium Table | | Sodium-12 | Sodium-20 | |----------------|-----------|-----------| | # of protons | 11 | 11 | | # of neutrons | 1 | 9 | | # of electrons | 11 | 11 | ### Selen…
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which of the following models best demonstrates a balanced chemical equ…
F. <The model with 1 white diatomic molecule, 2 dark diatomic molecules reacting to form 2 molecules with 1 white and 2 dark atoms each>
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19/20 which is the correct formula for: three hydrogen (h) one sulfur (…
None of the provided options match the correct formula $\text{H}_3\text{SO}_4$. The options listed are $\text{H}_2\text{SO}_4$, $\text{HSO}_4$, $\text{H}_4\text{S}_3\text{O}$, and…
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name: eliq perez date: february 3,2028 day 1 complete the terms and ans…
Melting ### Question 2
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lead has a density of 11.3 g/ml and a mass of 282.5 g. what is its volu…
25 mL (corresponding to the option "25 mL")
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temperature (°c) 0 10 20 30 40 50 60 70 80 90 100 57°c 33°c 75°c 94°c c…
25 mL (corresponding to the option "25 mL") ### For the temperature - related multiple - choice question (if we assume it's about the boiling point or some property of $SO_2$ from…
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directions: watch the video carefully and complete the guided notes as …
1. Chemical Bond Basics 1. transfer; share; stable 2. stable 2. Ionic Bonds 3. transferred 4. cations; anions 5. crystal lattice 6. high 7. dissolved in water; melted 3. Covalent …
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as chemistry unit 2 lesson 2 transfer task when tie - dying shirts, a c…
IV: Amount of sodium hydroxide (or concentration of sodium hydroxide solution) DV: How fast the purple color fades (or rate of purple color fading)
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(4) explain how you determined which conversion factor and which form o…
To determine the conversion factor and its fractional form in dimensional analysis: 1. **Identify Units**: Determine the initial unit (to convert from) and the desired unit (to co…
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classify each substance as an element or a compound. calcium chalk hydr…
### Elements: calcium, carbon, carbon, chlorine, mercury, sodium, zinc, copper, oxygen, hydrogen ### Compounds: chalk, salt, water, carbon dioxide, sugar (Note: The table can be f…
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in the reaction $3\\ce{cuso_{4}} + 2\\ce{al} \ ightarrow \\ce{al_{2}(so…
3 moles
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1 composition of matter (continued) classify each substance as an eleme…
### Elements: Calcium, Carbon, Chlorine, Mercury, Sodium, Zinc, Carbon, Copper, Oxygen, Hydrogen ### Compounds: Chalk, Salt, Water, Sugar, Dioxide (Note: If "dioxide" is unclear, …
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hs chemistry unit 2 review guide lesson 2: what factors cause objects t…
### Step 1: Identify the Independent Variable The independent variable is the factor that is intentionally changed in an experiment. In this experiment, the objective is to see ho…
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classify each substance as a solution, a colloid, or a suspension. writ…
- **Colloids**: milk, paint, perfume, smoke - **Suspensions**: herbed salad dressing, pulpy orange juice - **Solutions**: tea, vinegar
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characteristics of each in the table. \tsuspensions\tsolutions\tcolloid…
To fill the table about the characteristics of solutions, colloids, and suspensions (assuming the "particles" column is about particle size or other properties), we can use the fo…
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4. carbon dioxide gas and hydrogen gas react to form methanol gas and w…
Volume of $\text{CO}_2$ needed: $0.700\ \text{L}$ Volume of $\text{H}_2$ needed: $2.10\ \text{L}$
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4. exercises compare and contrast colloids, solutions, and suspensions.…
To solve this, we analyze the properties of colloids, solutions, and suspensions: ### For the "particles" column: - **Suspensions**: Particle size is usually greater than \(1000\,…
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empty vial mass: \\underline{6.1772} \ mass vial + water: \\underline{6…
The number of hydrogen atoms in the drop of water is approximately \( \boldsymbol{4.3 \times 10^{21}} \) (or \( 4.29 \times 10^{21} \)) atoms.
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1.a weather balloon functions on the principle of which gas law? a.char…
C. Combined Gas Law
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• sro(s) + co₂(g) ---> srco₃(s) δh = -234 kj• 2sro(s) ---> 2sr(s) + o₂(…
# Explanation: ## Step1: Label the given reactions Let's label the given reactions as follows: Reaction 1: $\ce{SrO(s) + CO_{2}(g) -> SrCO_{3}(s)}$ $\Delta H_1 = -234\ \text{kJ}$ …
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summative quiz ctions: using your resources, answer the following quest…
The gas from the bath bomb came from the chemical reaction between citric acid and a bicarbonate (e.g., sodium bicarbonate) present in the bath bomb's ingredients. Evidence 1: Bat…
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part ii directions: using your resources, place a check mark ✓ if the o…
To solve this, we analyze each observation's relevance to the argument about the gas source (bath bomb) by checking if it supports the idea that gas comes from the bath bomb or re…
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unless otherwise instructed, you may use the periodic table in the chem…
As (Arsenic) is the most likely best conductor of heat among the given options.
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unless otherwise instructed, you may use the periodic table in the chem…
C. As
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which element is a metalloid? li h ge ne
Ge
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unless otherwise instructed, you may use the periodic table in the chem…
Cu, Te, N
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unless otherwise instructed, you may use the periodic table in the chem…
A. At
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Question was provided via image upload.
When we crushed the bath bombs, the mass of the \underline{closed} and \underline{mass} systems stayed the same.
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unit 3: chemical reactions & matter where did the gas come from summati…
To solve these fill - in - the - blank questions, we rely on the principles of chemical reactions and the law of conservation of mass, as well as the concepts of open and closed s…
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unit 3: chemical reactions & matter where did the gas come from summati…
s: 1. closed system 2. open system 3. reactants and products 4. not (or "not fill up with gas" depending on the context, but the key is related to mass conservation in the system)
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8. a piece of pvc plumbing pipe displaces 60 ml when placed into a cont…
The density of PVC is $1.3\ \text{g/cm}^3$. ### Question 9
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density calculations density m d v d = \\(\\frac{m}{v}\\) divide mass m…
\( 1.6 \, \text{g/cm}^3 \) ### Problem 2:
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sulfuric acid and sodium hydroxide react. if 30 ml of 0.1 m soln of sul…
\(\Delta H=- 1672\space kJ/mol\) (or \(1672\space kJ/mol\) released, so \(\Delta H = - 1672\space kJ/mol\))
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question 3 3 points automotive antifreeze contains ethylene glycol, ch₂…
\(-10.0^{\circ}\text{C}\) (corresponding to the option: \(-10.0^{\circ}\text{C}\))
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4.3) noble gases are highly reactive f 5. which element is more likely …
1. Question 5: b. Sodium (Na) 2. Question 6: b. Malleable, ductile, good conductor 3. Applying Knowledge Q1: b. Sulfur (S) 4. Applying Knowledge Q2: a. Lithium (Li) 5. Applying Kn…
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question 2 most of the worlds maple syrup comes form quebec, canada. sa…
0.91 atm
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question 3 automotive antifreeze contains ethylene glycol, ch₂(oh)ch₂(o…
- 10.0 °C (Wait, no: the option is -10.0 °C. So the correct option is the third one: - 10.0 °C.
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10. what is the difference between endothermic and exothermic reactions…
10. Endothermic reactions absorb heat from the environment, while exothermic reactions release heat into the environment. 11. Cannot complete: Table 1 is not included in the provi…
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practice: classification part 1: classify the following as a substance …
## Part 1 1. S 2. M 3. S 4. S 5. M 6. M ## Part 2 7. E 8. C 9. C 10. E 11. E 12. E ## Part 3 13. HO 14. HE 15. HE 16. HO 17. HO 18. HO 19. HE 20. HO 21. HE ## Part 4 22. E 23. E 2…
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5. what are three signs that a chemical change has taken place? 6. why …
1. Three signs of chemical change are: formation of a new precipitate/solid, color change, and release/absorption of heat/light (or gas production). 2. Rusting iron is a chemical …
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1 what is matter, and what does it mean when we say matter can change? …
1. Matter is anything with mass and volume. Matter changing means it undergoes physical/chemical alterations to its form or composition. 2. A physical property is observable/measu…
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11. based on lithiums location on the periodic table, predict whether i…
11. Lithium is ductile. It is a Group 1 metal, and ductility is a characteristic physical property of metals. 12. Moving left to right across a period: Reactivity decreases for me…
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what kind of energy is stored in a battery? chemical elastic gravitatio…
chemical
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reading science 4. what type of chemical reaction occurs when more ener…
4. B. An exothermic reaction 5. C. An endothermic reaction 6. C. Photosynthesis
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reading science of the following statements regarding bond energy is fa…
1. A. All chemical bonds are hard to break. 2. C. The number and types of bonds within the molecule 3. B. Scientists compare the total bond energies of the reactants and the produ…
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lei a-131 chemistry 6. calculate the mass of fe(scn)₃ produced when 29.…
The mass of \( \text{Fe(SCN)}_3 \) produced is approximately \( 23.0 \, \text{g} \) (or more precisely \( \approx 23.0 \, \text{g} \))
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question 8 points 2 which of the following is responsible for an atom h…
By gaining or losing electrons
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question 7 points 3 which of the following uses roman numerals in their…
B. Type II metal cation
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question 6 points 2 which of the following do not contain ions? binary …
D. Binary molecular compounds
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identify the chemical compound. h₂o h₂ o₂ c
A. $H_2O$
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question 10 points 1 which of the following pairs would most likely for…
4 and 2 (Calcium and sulfate, Sodium and sulfate)
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8. look at a section of the periodic table showing groups 1, 2, and 18.…
8. At standard conditions, all elements in Groups 1 and 2 are solids, while all elements in Group 18 are gases; the trend is a shift from solid (left) to gas (right) across these …
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6. which groups are the most reactive, and which are the least reactive…
6. The most reactive groups are Group 1 (alkali metals) and Group 17 (halogens); the least reactive group is Group 18 (noble gases). 7. Metals like aluminum and copper have physic…
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3 multiple choice 1 point when bovine insulin was first isolated and in…
C. There is a fast onset of action of the drug ### Question 4
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based on your knowledge from the preceding video, see if you can answer…
D. It is a small molecule drug. ### Question 2
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1 multiple choice 1 point why are small molecule drugs (smds) often the…
C. Many SMDs can be administered orally, which does not require injection or the participation of a medical professional. ### Question 2
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wait: why do we round average atomic mass? which number is unique for e…
1. We round average atomic mass to approximate the mass number of the most common stable isotope, simplifying basic chemistry calculations. 2. The atomic number (number of protons…
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questions: 1. what two subatomic particles make the mass of an atom? 2.…
1. Protons and neutrons 2. No 3. Protons and electrons 4. Protons; electrons 5. Subtract the atomic number (number of protons) from the mass number of the atom, i.e., $\text{Numbe…
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17) ______ hcl + ______ caco₃ → ______ cacl₂ + ______h₂o + ______ co₂ 1…
2, 1, 1, 1, 1 ### Problem 18:
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cancer chemotherapy is often toxic, and therefore is not generally deli…
B. a parenteral
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1 multiple answer 1 point in what scenario might the rectal route of ad…
C. If the patient is vomiting, D. If the patient is an infant ### Question 2 (Multiple Choice)
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q.3. fill in the blanks using the following word bank. - compound - hom…
Top blank (above first circle): element Second top blank (above second circle): compound Bottom left blank (above third circle): heterogeneous Bottom right blank (above fourth cir…
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1. a ___________ drug enhances the effects of another drug, whereas a d…
1. synergistic; antagonist ### Question 2
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refer to the table of densities at the right to answer the following qu…
The volume of each cube is \( 8.00\,\text{cm}^3 \) (or \( 8.00\,\text{mL} \)). ### 6b. (Let's verify the given masses or calculate if needed, here we can show the calculation for …
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name: elements, compounds, and mixtures (worksheet) q.1. write t or tru…
1. F 2. T 3. T 4. F --- # Q.2: Answer-Explanation Format
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elements, compounds, and mixtures classify each of the pictures below b…
1. B= Compound 2. C= Mixture of elements 3. D= Mixture of compounds 4. E= Mixture of elements and compounds 5. C= Mixture of elements 6. B= Compound 7. A= Element 8. E= Mixture of…
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10. what is the wave speed of every form of energy on the em spectrum? …
The wave speed of every form of energy on the EM spectrum (in a vacuum) is \( 3.0\times10^{8}\, \text{m/s} \) (the speed of light). ### Question 11
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average atomic mass 1. the ptoe does not list ______ numbers or numbers…
1. whole; individual isotopes 2. multiple; weighted average of the masses of an element's isotopes 3. the mass of carbon-12 (set to 12 amu) 4. 12.01 5. three; average
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calculate the gibbs free energy for the following cell. half-reaction |…
\(- 52\) (or more precisely \(-52.1\))
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calculate the gibbs free energy, $\\delta g^\\circ$, for the following …
\(-1160\) (or \(-1158\))
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protons, neutrons and mass number: 1. mass number = number proton + mas…
1. $\text{Mass number} = \text{number of protons} + \text{number of neutrons}$ 2. name; mass number 3. Oxygen-14
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calculate the gibbs free energy for the following cell. mn | mn²⁺ || fe…
- 376 (or more precisely, - 376.3 if we use more precise calculation. The value can also be calculated as $-2\times96485\times1.95\times10^{- 3}\ kJ/mol=-2\times96.485\times1.95\ …
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calculate the e°cell value for the cell given below. mn | mn²⁺ || fe³⁺,…
+1.95
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e⁻ v or ps nacl e⁻ cu/cu²⁺ ni/ni²⁺ δg° = −110 kj is the reaction thermo…
1
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calculate the gibbs free energy for the following cell. half-reaction |…
-110
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which three temperature readings all mean the same thing? 373 kelvin, 1…
373 Kelvin, 100 degrees Celsius, 212 degrees Fahrenheit
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which pair of scientific fields would be most useful in investigating h…
D. Geophysics and geography
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what is the relationship between the kinetic energy of molecules in an …
C. As the temperature increases, the kinetic energy of the molecules increases. (Note: Assuming the third option is labeled as C; adjust the label based on actual question's numbe…
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calculate the e°cell value for the cell given below. half-reaction e° (…
\( +0.57 \)
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graphite | h₂o, h⁺, o₂, cd²⁺ | cd δg° = +629 kj is the reaction thermod…
2. unfavorable
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different elements: 1. all atoms of the same element have the same numb…
1. protons 2. atomic number 3. the number of protons in an atom 4. have; protons 5. nitrogen; oxygen; protons 6. protons; electrons; positive; negative
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calculate the gibbs free energy for the following cell. graphite | h₂o,…
+629 (or more precisely, 629.08, but rounded to a reasonable value)
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name kevin date class period bin #: chemistry - unit 1 worksheet 3: mas…
### Problem 1 (Figure 1) #### a. Relationship Table - **Mass**: Count the number of particles. Object A has fewer particles than B (since B’s box has more dots). So \( A < B \). -…
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calculate the $\\mathrm{e^\\circ_{cell}}$ value for the cell given belo…
\( +1.63 \)
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for the reaction below, 2li + f₂ → 2li⁺ + 2f⁻ δg° = -1140 kj what descr…
The reaction is thermodynamically favorable.
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calculate the standard gibbs free energy change for the cell. 2li(s) + …
-1140