化学
化学反応、化学量論、分子構造、元素の性質。
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prepwork part 1 ionic compound practice 1. for each pair of elements be…
| Element Pair | Lewis Dot Diagram of Ionic Compound | Formula | Name | |---------------------|------------------------------------------------------------------------------------…
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snowflakes form from tiny water droplets, following a specific process …
A. NO CHANGE ### Question 2
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section 3: prose fictiondirections: use this test review for all of the…
To solve these literature term matching questions, we analyze each term and its definition: ### Questions 7 - 11 (Literature Terms) 7. **Meter (Poetry)**: Matches **a** (arrangeme…
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seven. the ph scale indicates a solutions ability to release or accept …
B. to make baked goods fluffy rather than flat
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chemistry 1 worksheet classification of matter and changes name _______…
H (heterogénea)
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name instructions: write h in the blank if the material is heterogeneou…
# Explanation: To classify each material as heterogeneous (H) or homogeneous (O), we analyze the uniformity of composition: ## Step 1: Wood Wood has visible different parts (e.g.,…
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part 3: match each diagram with its correct description. diagrams will …
1. C. Pure Element - only one type of atom present. 2. E. Mixture of two elements - two types of uncombined atoms present. 3. B. Pure compound - only one type of compound present.…
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name: date: u4l4 - direction of heat transfer homework team: part 1: re…
Heat conduction is the transfer of heat by direct contact of matter particles. For example, when a cold spoon is placed in hot cocoa, cocoa molecules (with higher average kinetic …
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read the passage from chapter 5 of animal farm. at the meetings snowbal…
D. Both Snowball and Napoleon are persuasive leaders and clever animals.
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assignment you will be assigned an element. you will build a 3-d repres…
Chemistry (under Natural Science)
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select the correct answer from each drop-down menu. 1. they decided to …
1. sustenance 2. austerity 3. transmutation 4. obscurity
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part h indicate the number of unpaired electrons in in. express your an…
1
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part f indicate the number of unpaired electrons in na. express your an…
1
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write the orbital diagram for the valence electrons of na. drag the app…
The single \(s\) orbital (left - most box) gets one electron (e.g., the label for one electron, like the '1' or the single - spin label) and the \(p\) orbitals (three - box group)…
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part d indicate the number of unpaired electrons in kr. express your an…
0
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part b indicate the number of unpaired electrons in br. express your an…
1
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write the orbital diagram for the valence electrons of br. drag the app…
For the 4s orbital (left box): drag '4' (blue label),'s' (red label), and the $\uparrow\downarrow$ electron label. For the 4p orbitals (three boxes): drag '4' (blue label), 'p' (r…
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write an orbital diagram for argon. drag the appropriate labels to thei…
- \(1s\): \(11\) - \(2s\): \(11\) - \(2p\) (each of the three boxes): \(11\) - \(3s\): \(11\) - \(3p\) (each of the three boxes): \(11\) (To apply this, drag the "11" label to eac…
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part d enter the correct ground - state (or lowest energy) configuratio…
\(1s^22s^22p^3\) ### Part E
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part c enter the correct ground - state (or lowest energy) configuratio…
\(1s^22s^22p^63s^23p^2\)
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enter the correct ground - state (or lowest energy) configuration based…
\(1s^22s^22p^63s^23p^3\)
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enter the correct ground - state (or lowest energy) configuration based…
(for the first part: \(1s^22s^22p^9\) correction): \(1s^22s^22p^63s^23p^1\) (For Part C: \(1s^22s^22p^62d^4\) correction)
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identify what is wrong with each electron configuration. match the item…
- \(1s^2 2s^3 2p^9\): There is a maximum of 6p and 2s electrons - \(1s^2 2s^2 2p^6 2d^4\): There can be no \(2d\) subshell - \(1s^2 1p^5\): There can be no \(1p\) subshell - \(1s^…
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part a what is hunds rule? - when filling orbitals of equal energy, ele…
A. When filling orbitals of equal energy, electrons fill them singly first, with parallel spins.
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responds to the stress in such a way to minimize the stress as the reac…
1. Increases 2. Decreases 3. Increases 4. Decreases
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Question was provided via image upload.
1. \(0.020\ \text{M}\) 2. \(1\ \text{mol}\) 3. \(0.020\ \text{M}\) 4. \(0.020\ \text{M}\) 5. \(0.020\ \text{M}\) \(K_a \approx 0.013\) (or \(\frac{0.020\times0.020}{0.030} \approx…
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the $k_{eq}$ for the reaction of water with water is called $k_w$ $\\ce…
1. up (increase) 2. down (decrease) 3. down (decrease) 4. up (increase)
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the inverse log, or -log, as indicated by p, can be reversed. this conv…
1. B. \(2.158\times 10^{-7}\) 2. C. \(1.29\times 10^{-9}\) 3. A. \(1.67\times 10^{-8}\)
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17. which of the following practices is not a characteristic of sustain…
b. Overusing chemical fertilizers
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19. which is a major challenge of implementing sustainable agriculture …
b. Lack of awareness and resources
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use your calculator for the following 1. when $\\ce{h3o^{+1}} = 5.555 \…
s (filling blanks): 1. F. 3.255 2. A. acidic 3. F. 3.255 4. B. basic or alkaline 5. D. 1.800 x 10⁻¹¹ 6. D. 1.800 x 10⁻¹¹ 7. E. 10.745 8. B. basic or alkaline
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use your calculator for the following 1. when $\\ce{h3o^{+1}} = 5.555 \…
1. pH: F. 3.255; Solution type: A. acidic 2. pOH: F. 3.255; Solution type: B. basic or alkaline 3. $[\text{H}_3\text{O}^+]$: D. $1.800 \times 10^{-11}$; pH: E. 10.745; Solution ty…
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the $k_{eq}$ for the reaction of water with water is called $k_w$ $\\ce…
1. down 2. down (for the acid - adding case as per the example) 3. down 4. down
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the $k_{eq}$ for the reaction of water with water is called $k_w$ $h_2o…
up (or increases) ### Question 2
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h₂o + h₂o ↔ h₃o⁺¹ + oh⁻¹ h₃o⁺¹ oh⁻¹ k_w = ------------- = h₃o⁺¹ oh⁻¹ = …
up (or increases) ### Sub - question 2
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the concentration of hydronium ions and hydroxide ions can vary widely …
For both the pH (blank 1) and pOH (blank 2) of a neutral solution, the answer is A. 7.
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1. what is the primary goal of recycling? a. to convert waste materials…
a. To convert waste materials into new products
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consider the reaction and its energy diagram 2 a + 25 kcal/mol ↔ 2 b + …
A. true ### Question 2:
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consider the reaction and its energy diagram 2 a + 25 kcal/mol ↔ 2 b + …
A. true ### Question 2
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for the following reaction at equilibrium hclo₄ + h₂o → clo₄⁻¹ + h₃o⁺¹ …
1. A. acid; E. strong 2. B. base; F. weak; F. weak 3. D. conjugate base; F. weak 4. C. conjugate acid; E. strong
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question 1 (2 points) for the following reaction at equilibrium nh₃ + h…
__1__: C. \( \text{NH}_4^{+1} \) __2__: D. \( \text{OH}^{-1} \) __3__: A. \( \text{NH}_3 \) __4__: E. increases __5__: F. decreases
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which type of waste can contain hazardous materials and valuable compon…
b. Electronic waste (E - waste) ### Second Question (Which waste management practice aims to eliminate waste sent to landfills?)
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what are biodegradable substances? ○ a. materials that can be decompose…
a. Materials that can be decomposed by living organisms ### Second Question (Which waste management practice helps improve soil health?):
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what does the zero waste philosophy promote? a. redesigning resource li…
a. Redesigning resource life cycles to eliminate waste ### Second Question (What is waste - to - energy?):
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which of the following is a benefit of composting? a. produces hazardou…
b. Reduces the amount of organic waste in landfills ### Second Question (What is Hazardous Waste)
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question 4 (2 points) answer each of the following for the following re…
1. F. $\ce{H2O}$ 2. A. $\ce{NH3}$ 3. D. $\ce{NH4+1}$ 4. E. $\ce{OH-1}$ 5. I. weak
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question 3 (2 points) answer each of the following for the following re…
1. A. $\ce{H2SO3}$ 2. F. $\ce{H2O}$ 3. C. $\ce{H3O^{+1}}$ 4. D. $\ce{HSO3^{-1}}$ 5. H. weak
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question 2 (2 points) answer each of the following for the following re…
1. A. HCl 2. E. $H_2O$ 3. C. $H_3O^{+1}$ 4. D. $Cl^{-1}$ 5. F. strong
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question 1 (2 points) answer each of the following as either true or fa…
1. A. true 2. B. false 3. A. true 4. A. true
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Question was provided via image upload.
### Ionic Compounds: $\ce{Al2O3}$, $\ce{AlPO4}$, $\ce{Ba(OH)2}$, $\ce{Ca3N2}$, $\ce{Cu(NO3)2}$, $\ce{FeS}$, $\ce{K2CO3}$, $\ce{KCN}$, $\ce{KHSO4}$, $\ce{Li3P}$, $\ce{LiC2H3O2}$, $…
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question 3 (3 points) the following is list of weak acids and their pkₐ…
1. F. hydrogen citrate 2. A. 4.20 3. J. bad
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the ability of a solution to resist changes to the ph from added acid o…
1. A. good 2. C. true 3. C. true
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11. which renewable energy source is produced from organic materials? a…
a. Biomass energy
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9. what is the primary focus of agroforestry? a. combining agriculture …
a. Combining agriculture with forestry
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buffers are solutions that buffer against large changes in ph when an a…
1. \( \ce{H2PO4^{-1}} \) 2. \( \ce{H2PO4^{-1}} \) 3. \( \ce{H2PO4^{-1}} \) 4. \( [\ce{H2PO4^{-1}}] \) 5. \( 4.44 \times 10^{-5} \) 6. \( 4.96 \times 10^{-8} \, \text{M} \) (approx…
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what does biomass energy primarily rely on? a. nuclear reactions b. fos…
d. Organic materials ### Second Question:
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how is geothermal energy primarily used? a. for heating and power gener…
a. For heating and power generation ### Second Question (Which renewable energy source is produced from organic materials?):
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how many liters of a 5.00 m solution of na₃po₄ are needed to have 4.00 …
DD. 0.267
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which farming method avoids synthetic inputs entirely? a. urban agricul…
d. Organic farming using natural methods ### Second Question (What is the primary focus of agroforestry?)
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which of the following practices is not a characteristic of sustainable…
a. Overusing chemical fertilizers ### Second Question (Which farming practice can help mitigate the effects of climate change?)
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which practice helps improve soil health and reduce pest issues? a. cro…
a. Crop rotation across fields ### Second Question (What is the main goal of organic farming?)
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how many equivalents in are in 2.00 l of a 5.00 m solution of na₂so₄ ? …
The number of equivalents is 20.0, so the answer for the final blank (__7__) is AA. 20.0 (AA. 20.0)
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Question was provided via image upload.
Pseudoscientific. Reasoning: Scientific claims require evidence (data/studies), but this claim has none. ### Question 4
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how many liters of a 5.00 m solution of na₃po₄ are needed to have 4.00 …
Blank 2: E. 4.00 Blank 3: B. 1.00 Blank 4: (No option, but intended 4) Blank 5: B. 1.00 Blank 7: F. 5.00 Blank 6: Z. 0.200 (Assuming the main answer for the final liters is Z. 0.2…
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how many osmoles are in 2.00 l of a 5.00 m solution of na₂so₄ ? first w…
1. D (1 mol = 3 osmol) 2. F (5.00 mol/L) 3. C (2.00 L) 4. W (\( 10^1 \)) 5. D (3.00 osmol/mol) 6. W (\( 10^1 \) mol) 7. X (30.0 osmoles) (Note: The question asks for the number of…
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question 2 (1 point) how many ml of a 5.00 ppm solution are needed to h…
- Blank 2: B. 1.00 - Blank 4: F. 5.00 - Blank 3: L. \(10^5\) - Blank 1: M. \(10^6\) (assuming the formula structure is \((1.00\ \text{g})(\frac{10^6\ \text{mL}}{5.00\ \text{g}})=2…
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question 2 (1 point) how many ml of a 5.00 ppm solution are needed to h…
Blank 2: B. 1.00 Blank 4: F. 5.00 Blank 3: L. \( 10^5 \) (Note: Assuming the structure, the key blanks are 2 (B), 4 (F), 3 (L). The calculation confirms \( 1.00\ \text{g} \times \…
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question 1 (1 point) how many grams of solute are in 2000. ml of a 5.00…
Blank 1: F. 5.00 Blank 2: J. 2000 Blank 3: P. \(10^{-2}\) Blank 4: M. \(10^6\)
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question 10 (1 point) 4 ph₃ + 2 h₂ + 9 o₂ ⇔ 2 p₂o₅ + 8 h₂o(liq) + 25 kj…
1. H. $\Delta G = - 25$ kJ 2. F. exergonic 3. J. spontaneous
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question 9 (1 point) 4 ph₃ + 2 h₂ + 9 o₂ ↔ 2 p₂o₅ + 8 h₂o(liq) + 25 kj …
1. A. exothermic 2. D. gives off heat
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draw the energy diagram (energy verses course of reaction curve) for th…
1. A. A 2. C. C 3. D. D 4. B. B
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name: joel t date: period: calculate the number of calories in a food s…
The number of Calories is \( 1000 \) (or \( 1\,\text{kcal} \)).
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question 6 (1 point) give the theoretical rate equation for the forward…
__1__: E. 1 __2__: F. 2 __3__: O. 0 __4__: A. \( \ce{C2H6} \) __5__: B. \( \ce{Cl2} \)
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question 5 (1 point) give ways that could be used to increase productio…
1. D. forward → 2. A. increase 3. A. increase 4. A. increase 5. B. decrease 6. B. decrease 7. A. increase
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question 3 (1 point) use le chateliers principle to decide what happens…
1. A. increases 2. B. decreases 3. B. decreases 4. A. increases
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question 2 (1 point) use le chateliers principle to answer the followin…
1. A. increases 2. A. increases 3. B. decreases 4. B. decreases
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question 1 (1 point) calculate the $k_{eq}$ if all are gases. \\begin{a…
__1__: A. \( \text{NH}_3 \) __2__: H. \( 0.600 \) __3__: G. \( 8.33 \) __4__: B. \( \text{N}_2 \) __5__: C. \( \text{H}_2 \) __6__: J. \( 0.200 \) __7__: H. \( 0.600 \) (Note: The…
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calculate the $k_{eq}$ from the given concentrations. $mgcl_2$ and $k_2…
1. F (KCl) 2. U (1.40) 3. GG (21.8) 4. E (MgCl₂) 5. C (K₂CO₃) 6. S (0.300) 7. S (0.300) Wait, but the question's blanks: \([\_1\_]^2\) is the chemical symbol for KCl (F), then \((…
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give the expression for $k_{eq}$ for the reverse reaction. all are gase…
__1__: C. \( \ce{C2H6} \) __2__: E. \( \ce{Cl2} \) __3__: D. \( \ce{C2H4Cl2} \) __4__: F. \( \ce{HCl} \) \( K_{eq}^r = \frac{[\ce{C2H6}][\ce{Cl2}]^2}{[\ce{C2H4Cl2}][\ce{HCl}]^2} \)
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calculate the ph of the above buffer after 10.00 ml of 1.000 m naoh (0.…
1. A. $\ce{H3O^+1}$ 2. H. $\ce{HC2H3O2}$ 3. H. $\ce{HC2H3O2}$ 4. $1.60 \times 10^{-5}$ 5. $0.4900$ M 6. $\approx 1.10 \times 10^{-5}$ M (or follow calculation) 7. I. $\ce{C2H3O2^-…
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part c list the maximum number of electrons that can be contained in ea…
2,6,10,14
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calculate the ph of the buffered solution if at equilibrium h₂so₃ = 3.5…
1. A. \( \ce{H3O^+1} \) 2. G. \( \ce{H2SO3} \) 3. G. \( \ce{H2SO3} \) 4. V. \( 1.75\times10^{-6} \) 5. T. \( 3.50\times10^{-4} \) 6. W. \( 1.11\times10^{-8} \) 7. X. \( 5.5\times1…
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learning goal: to understand the energy levels in atoms. in an atom, ea…
2, 8, 18, 32 ### Part B
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10. which property is independent of the amount of a substance? a) mass…
C) Density ### Question 11
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) \(0.0000653\) moles per L (b) \(4.7\times 10^{4}\) pounds
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Question was provided via image upload.
A molecular equation for a redox reaction is $\boldsymbol{\ce{2H_{2} + O_{2} \xlongequal{点燃} 2H_{2}O}}$ (where hydrogen is oxidized and oxygen is reduced).
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br li s si h mg p na c o 1 2 3 4
- Group 1 (1 valence e⁻): Li, Na, H - Group 2 (2 valence e⁻): Mg - Group 14 (4 valence e⁻): C, Si - Group 16 (6 valence e⁻): S, O - Group 17 (7 valence e⁻): Br (If we have to conn…
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sodium carbonate na₂co₃ br li s si h mg p na c o
For $\ce{Na2CO3}$, the elements are Sodium (Na), Carbon (C), and Oxygen (O). So connect Na, C, O to their respective dashed boxes (the ones they are linked to, as they are the con…
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68. absolute/radionetric dating can tell us the ______ of a rock, fossi…
age ### Question 69
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calculate the gpa of the student from the tables below. use the techniq…
\(2.89\)
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46. match each type of bond to its description. nonpolar covalent polar…
- Ionic: Electrons transferred - Nonpolar covalent: Electrons shared equally - Polar covalent: Electrons shared unequally
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44. a fundamental type of matter that is made of only one type of atom …
element
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36. calculate the density of an object with a volume of 40 ml and mass …
The density of the object is $0.1875$ g/mL (or $0.1875$ g/$cm^3$).
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37. find the liquid volume represented in the graduated cylinder drawin…
The density of the object is $0.1875\ \text{g/mL}$ (or $\boldsymbol{0.19\ \text{g/mL}}$ if rounded to two decimal places). ### Question 37:
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36. calculate the density of an object with a volume of 40 ml and mass …
26 mL (Note: The exact value depends on the graduated cylinder's scale, but assuming standard markings, the volume is read as 26 mL (or similar, but based on typical scale, 26 mL …
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41. in the space below, draw and label a lithium atom, including the th…
- **Nucleus**: Cluster with 3 \(p^+\) and 4 \(n^0\). - **Inner Shell (n=1)**: 2 \(e^-\). - **Outer Shell (n=2)**: 1 \(e^-\). (Visually: Nucleus at center, inner circle with 2 elec…
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kelsey made a sand castle at the beach. she mixed 100 grams of seawater…
The sand castle is made of sand and seawater. Most of the sand and seawater is in the sand castle, but some of it is on Kelsey's hands.
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on monday, tyler put a 50-gram ice cube in a 50-gram cup. over the next…
The mass of water vapor is 30 grams, so the bar for "water vapor" in the graph should be drawn to the height of 30 grams (on the y - axis marked in grams).
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on monday, tyler put a 50-gram ice cube in a 50-gram cup. together, the…
The ice melted into liquid water. Then, some of the water evaporated.
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to make an omelet, mrs. buckley mixed three 50-gram eggs with 75 grams …
The bar for water should have a height corresponding to 25 grams (so it will be the same height as the cheese bar in the 'Before' section, reaching up to 25 on the y - axis).