Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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video game sales hit $43.4 billion in 2018. since video games are so po…
a. by explaining the positive and negative effects of video games
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ch3—ch2—ch2—c≡c—ch3
To determine the name of the compound \( \text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{C} \equiv \text{C} - \text{CH}_3 \), we follow these steps: ### Step 1: Identify the longe…
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part ii. bond polarity and intermolecular force polarity can determine …
For the interaction between \( \ce{H2S} \) and \( \ce{H2O} \), the intermolecular force is Dipole - dipole force.
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2. you must use both heat and chemicals to properly sanitize kitchen eq…
False
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penelope conducted a scientific experiment. for a certain time, the tem…
\(2\)
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alang conducted a scientific experiment. for a certain time, the temper…
\(3\)
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given the following atomic symbol. answer the following questions. \\(_…
- Isotope name: Iron - 55 - Number of Protons: 26 - Number of Electrons: 30 - Number of Neutrons: 29 - Ion: anion (B. anion, if we consider the options as A. cation, B. anion, C. …
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given the following atomic symbol. answer the following questions. \\(_…
Scandium - 45 ### Number of Protons
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4. briefly describe the important experiment and/or contribution to the…
### Question 4 a) Democritus: First proposed that all matter is made of indivisible, indestructible particles called atoms (named "atomos"). b) Dalton: Developed the first scienti…
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the graph shows the amount of a chemical in a patients body at differen…
Yes, the chemical could be decaying exponentially. The amount of the chemical is multiplied by a constant factor of 0.6 each hour, which is the defining characteristic of exponent…
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step 1: get on board everyone has a role in safety a new job is a chanc…
1. New and young workers $\square$ (checked) Why? New and young workers often lack knowledge of job hazards, don't know what to expect, and aren't sure who to ask for safety infor…
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_fepo₄ + _mgo → _mg₃(po₄)₂ + _fe₂o₃ ○ 1,1,2,3 ○ 2,3,1,1 ○ 3,2,1,0 ○ 2,1…
2, 3, 1, 1 --- ### Second Question (Identifying Incorrectly Balanced Equation)
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2 the graph shows the amount of a chemical in a water sample. it is dec…
- Point A: $(2, 640)$ - Point B: $(3, 512)$ - Point C: $(4, 409.6)$
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mixture or pure substance? mixture pure substance
mixture
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2 the graph shows the amount of a chemical in a water sample. it is dec…
- Point A: (2, 700) - Point B: (3, 600) - Point C: (4, 500) --- ### Second Problem (Select True Statements)
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what will be the total number of oxygen atoms on either side of the che…
1. 10 2. 1, 2, 1, 1
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is this a mixture or a pure substance? pure substance mixture
mixture (the purple button labeled "mixture")
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how many oxygen atoms will be on the reactant side of the chemical equa…
1. 15 2. 3, 1, 2, 3
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question 8 (1 point) in the reaction: $\\ce{kno_{3}(aq) + pbso_{4}(aq) …
there is no reducing agent
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question 2 (1 point) identify the oxidizing agent in the reaction: $ce{…
B. \( \text{O}_2(\text{g}) \)
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question 1 (1 point) what is the correct balanced net ionic equation fo…
\( \boldsymbol{\text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s}) ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq})} \) (corresponding to the option: \( \text{Fe}^{2+}(\text{…
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elements that act like both a metal and a nonmetal are called _______. …
C. metalloids
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type the number of the coefficient needed to balance the number of oxyg…
1. 5 2. 2, 1, 1, 2
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the atomic number of the element is the same as the the number of _____…
A. protons
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2/14 each box on the periodic table represents one atom of that element…
One atom of that element
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complete the sentence with the best correlative conjunctions. on earth,…
not only... but also
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read the following sentences from the section \chemical reaction defini…
They both help to clarify what a chemical reaction is by distinguishing it from other types of reactions.
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is the author of the article suggesting that unbalanced chemical equati…
Yes; "An unbalanced chemical equation doesn't account for conservation of matter, but it's often a good starting point because it lists the products and reactants and the directio…
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how does wildfire help restore soil nutrients? a. wildfire kills off th…
d. All of the above
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unit: electron configurations \electron configurations for ions\ direct…
1. N (long): $1s^2 2s^2 2p^3$; N (abbreviated): $[He] 2s^2 2p^3$ N⁻³ (long): $1s^2 2s^2 2p^6$; N⁻³ (abbreviated): $[Ne]$ Which neutral atom is isoelectronic with N⁻³?: Neon (Ne) H…
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dr. bhatia mixes 2 liters of a 5% saline solution with x liters of a 9%…
6 (corresponding to the option with 6, e.g., if the options are A.3, B.4, C.5, D.6, then D.6)
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question 9. student 4: added powdered sugar in ice - cold water and sti…
D. Student 4 because stirring with powdered sugar helps it dissolve.
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maki uses 20 gallons of a solution with an unknown ethanol concentratio…
0.04
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when preparing a concentrated nacl solution, a student dissolves 20 gra…
C. Add more NaCl to the solution without changing the amount of water.
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question 6. baking soda is in a balloon. vinegar from the attached ball…
B. A chemical change occurred because a gas was produced.
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a 4% peroxide solution is mixed with a 10% peroxide solution, resulting…
8
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question 5. mass: 200 g clear mass: 200 g mass: 400 g the student can c…
A. A solid formed when the two liquids were mixed.
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a chemist is analyzing the composition of caffeine, which has the chemi…
D. There are more nitrogen atoms than oxygen atoms.
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question 3. ascorbic acid is a naturally occurring compound with antiox…
C. 6 carbon, 8 hydrogen, 6 oxygen
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question 2. which of the following statements accurately describes the …
B. Elements comprise only one type of atom, while compounds contain two or more types of atoms chemically combined. E. Elements are represented by chemical symbols, while compound…
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11. a forklift is used to lift a large 704 kg crate a distance of 5.54 …
Approximately \( \boldsymbol{47.5\%} \) (assuming a possible typo in mass, as 704 kg gives impossible efficiency) ### Question 12
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question 1, - diamond ring (c) - table sugar (c₁₂h₂₂o₁₁) - helium ballo…
A. Diamond ring: Element, Table sugar: Compound, Helium balloon: Element, Rust: Compound
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11. a forklift is used to lift a large 704 kg crate a distance of 5.54 …
# Explanation: ## Step1: Calculate useful work done (lifting the crate) The work done in lifting an object is given by \( W = mgh \), where \( m = 704\space kg \), \( g = 9.8\spac…
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chapter outline continued a. nonmetals do not have luster, cannot be ea…
To solve these fill - in - the - blank questions, we rely on the knowledge of Chemistry (a subfield of Natural Science), specifically the concepts related to the periodic table, e…
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synthesis (s) or decomposition (d) ? 1) \\( \\text{p}_4\\text{o}_{10(\\…
D ### 2)
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synthesis (s) or decomposition (d)? 1) \\(\\ce{p4o10(s) -> p4(s) + 5o2(…
D (Decomposition), as one compound ($\ce{P4O10}$) breaks into simpler substances ($\ce{P4}$ and $\ce{O2}$). ### 2)
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6. when chlorine gains an electron from sodium, what is the charge of t…
c) Negative ### Question 7
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directions: use the video to answer the following questions. video: htt…
b) Neutrons, protons, and electrons ### Question 2
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3. a compound is made of materials that are chemically combined in a fi…
3. C. Each substance in a mixture keeps its individual properties 4. B. Every atom present in the reactants is also present in the products 5. C. $\text{C} + \text{O}_2 ightarrow …
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bell work - thursday, jan. 8, 2026 write the letters of the correct ans…
1. A. Reaction 1 advantages: produces plenty of heat; Reaction 2 advantages: produces a more moderate temperature, is resuable 2. D. Chemical changes produce new substances.
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passage poems publius ovidius naso, known as ovid in english literature…
by comparing the passage of time to waves breaking on the shore
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14. part 1 construct your multiple choice prompt here. ammonium nitrate…
A. \(NH_4NO_3\)
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what products will form from a given set of reactants? pb(no₃)₂ (aq) + …
$\boldsymbol{\ce{NaNO_{3}(aq) + PbI_{2}(s)}}$ (assuming the first option has a typo and should be this, or if the first option is $\ce{NaNO_{3}(aq) + PbI_{2}(s)}$ then that is the…
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12. if you want to dissolve 40.2 g of kcl in 100 g of water, what tempe…
60°C (Option: 60°C)
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general steps 1. count all bonds to get the number of sigma bonds 2. ad…
Sigma bonds: \(\boldsymbol{4}\), Pi bonds: \(\boldsymbol{2}\)
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11. the graph shows various compounds solubilities as a function of tem…
C. KCl
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3. use hesss law and the equations given below to determine the molar e…
The molar enthalpy of the reaction \(2H_2S(g)+3O_2(g) ightarrow2SO_2(g)+2H_2O(l)\) is \(\boldsymbol{-1124\ kJ}\)
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9. the figure displays two types of bonding. which type of bonding is r…
C. hydrogen
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balance these equations ____na₃po₄ + ____koh → ____naoh + ____k₃po₄ ___…
1. $\boldsymbol{\text{Na}_3\text{PO}_4 + 3\text{KOH} ightarrow 3\text{NaOH} + \text{K}_3\text{PO}_4}$ (coefficients: 1, 3, 3, 1) 2. $\boldsymbol{2\text{C}_8\text{H}_{18} + 25\text…
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your turn, from structure to sigma and pi counts the organic chemistry …
To solve for the number of sigma ($\sigma$) and pi ($\pi$) bonds in each molecule, we analyze their structures: ### 1. Ethene ($\boldsymbol{\ce{C2H4}}$) Ethene has a double bond (…
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2. the haber process is a very valuable chemical reaction for the indus…
1. **Increase Temperature**: Higher temperature increases reactant molecules’ kinetic energy, causing more frequent and energetic (effective) collisions. 2. **Increase Pressure (o…
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histamine atom counts element\ttotal # atoms carbon\t<xxx> hydrogen\t<x…
To determine the atom counts for histamine (\( \text{C}_5\text{H}_9\text{N}_3 \), since histamine's molecular formula is \( \text{C}_5\text{H}_9\text{N}_3 \) and there is no oxyge…
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ionic bonds - do now in class draw lewis dot diagrams for the following…
1. NaF: $\text{Na}^+ \ [\cdot \underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{F}}} \cdot]^-$ 2. BaCl₂: $\text{Ba}^{2+} \ 2[\cdot \underset{\cdot \cdot}{\overset{\cdot \cdot}{\t…
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show all of your work for full marks (aoking problems, including units,…
The thermodynamic property responsible is the high specific heat capacity (and density anomaly) of water. The large volume of water in Lake Ontario requires a massive amount of he…
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a. what are the three main ways that solid waste is handled in the us? …
a. 1. Landfilling (disposing waste in designated sites) 2. Recycling/composting (processing materials for reuse or organic decomposition) 3. Incineration/waste-to-energy (burning …
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2. for the following pair of substances (i) and (ii) state which would …
The pair (i) (3g of salt in 1M HCl) has a higher reaction rate. This is because the concentration of the hydrochloric acid (1M) is higher than in (ii) (0.1M), and reaction rate in…
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the following pair of substances (i) and (ii) state which would have a …
The reaction (dissolution of salt or reaction with HCl) will have a higher rate in the solution of 1M hydrochloric acid. The factor affecting the rate is concentration. A higher c…
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1. use the diagram to the right to answer the following question: /4 a)…
Endothermic ### Part (b)
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name molar mass maze directions: begin on the start square and calculat…
To solve the Molar Mass Maze, we start at the "START" block and calculate the molar mass of each compound, following the correct path to the "FINISH". Here are the key calculation…
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what is the percent composition of elements in caffeine c₈h₁₀n₄o₂? perc…
### Percent Composition & Formulas 1. Percent composition of caffeine: - Carbon: 49.47% - Hydrogen: 5.19% - Nitrogen: 28.86% - Oxygen: 16.48% 2. Empirical formula: $\text{C}_3\tex…
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12. calculate the number of moles of molecules in $1.20 \\times 10^{24}…
The number of moles is approximately $\boldsymbol{2.00}$ mol (or $\boldsymbol{1.99}$ mol for more precision).
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Question was provided via image upload.
$$1\text{CH}_4 + 2\text{O}_2 ightarrow 1\text{CO}_2 + 2\text{H}_2\text{O}$$ (The coefficients in order are: 1, 2, 1, 2)
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10. for a first order reaction, a plot of which variables will result i…
b. \(\ln[A]\) vs time
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e. the frequency of collisions possessing kinetic energy exceeding the …
c. Increase by a factor of 4
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overall rate concentration of a reactant not involved in the rds will s…
d. A greater fraction of collisions possess kinetic energy exceeding the activation energy
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7. which statement regarding the rate determining step (rds) of a multi…
d. The rate law of the overall reaction is identical to the rate law of the RDS
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4. balance the following reactions: \\(\\ce{albr_{3} + k_{2}so_{4} \ ig…
$2\text{AlBr}_3 + 3\text{K}_2\text{SO}_4 ightarrow 6\text{KBr} + \text{Al}_2(\text{SO}_4)_3$
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chemistry i – introduction to lewis structures for more complicated mol…
To solve for the Lewis structures of each compound, we follow the 5 - step procedure for Lewis structures: ### 1. For \( \boldsymbol{HCl} \) - **Step 1: Determine total valence el…
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c. $e_{a(\text{reverse})} = e_{a(\text{forward})}$ d. $e_{\text{reverse…
c. \(0.41\ J/g\cdot^{\circ}C\)
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4. how does the activation energy (ea) of the reverse reaction relate t…
a. \( E_{\text{reverse}} = E_{\text{forward}} - \Delta H \)
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3. which of the following statements about specific heat capacity is in…
d. A bath tub of water would have a lower heat capacity than a teaspoon of water
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2. for the reaction \\(\\ce{n_{2(g)} + 3h_{2(g)} -> 2nh_{3(g)}}\\), the…
To solve this, we analyze each statement using bond energy and enthalpy concepts: ### Step 1: Recall reaction enthalpy formula Reaction enthalpy ($\Delta H$) = Sum of bond energie…
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elements and the periodic table- reading comprehension directions: answ…
**: matter 2. **Explanation for Q2**: John Dalton’s atomic theory is known as Dalton’s Atomic Theory.
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read the lab report conclusion and then answer the question. based on t…
B. a high school science teacher
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their home, grazing 1 in aroostook county, northern maine, i knew nothi…
4. The stove is the central feature of the room.
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***please indicate your choice in the box like this: a) b) c) d) e) 1. …
To solve this problem, we need to determine the enthalpy change of the dissolution process. This involves calculating the heat absorbed by the solution (since the temperature drop…
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1 in aroostook county, northern maine, i knew nothing about fiddleheads…
4. a sense that the room is the same as it has been for years
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name: zach lewis (electron dot) diagrams worksheet - review 1. draw lew…
## 1. Single-Atom Lewis Diagrams: - $\text{Li} \cdot$ - $\cdot \ddot{\text{F}} :$ - $\cdot \ddot{\text{Si}} \cdot$ $\quad \cdot$ - $\cdot \ddot{\text{N}} :$ $\quad \cdot$ - $\text…
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examples of the chemical energy mention in the video are coal, petroleu…
B. Batteries, burning gasoline and fireworks
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chemical energy is the energy of ______ reactions. chemical physical re…
chemical
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do now 20 (module 7 - lesson 4) 3 of 4 01:38 / 05:00 possible points: 2…
H-H < H-C < H-N < H-O < H-F
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read the poem \to a much too unfortunate lady.\ he will love you presen…
Please clarify your question about the poem (e.g., theme, literary devices, rhyme scheme) to get a specific answer.
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8) if the mass of a rock is 23.8 g and the volume of that rock is 4.51 …
D. 5.28 g/mL
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7) how much water (in ml) is in this graduated cylinder? a) 6 ml b) 6.6…
C) 6.6 mL ### Question 8
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a compound is formed in the reaction below: $6h_2o + 6co_2 \ ightarrow …
- Mass of \(CO_2\) used: 144.12 g (the option is 144.12) - For \(NH_4\) - match with 5 is correct; for \(HC_2H_3O_2\) - match with 8 is correct. - Moles of Carbon: 3 (the option i…
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match the term to whether it is endothermic or exothermic. * 6 points e…
s: #### Phase Changes (Correct Selections): - Boiling: Endothermic (correct as marked). - Condensing: Exothermic. - Deposition: Exothermic. - Evaporating/Vaporating: Endothermic (…
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beaker a beaker b which beaker will require more energy to change the t…
**C:** Beaker B needs more energy for temp change. **E:** Beaker A = 800 mL; Beaker B = 1000 mL. **R:** $Q=mc\Delta T$; higher mass needs more $Q$.
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how are elements represented on the periodic table? periodic table of t…
C. By chemical symbols
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find the relative clause. if it is nonrestrictive, set it off with comm…
that have not been treated with pesticides
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which sample of water contains particles having the highest average kin…
A. 25 mL of water at 95°C ### Second Question (Kelvin Difference Between Boiling and Freezing Points)