化学
化学反応、化学量論、分子構造、元素の性質。
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question 15 6 pts what is the abbreviated electron configuration, and, …
abbreviated electron configuration = \([Ne] 3s^2 3p^4\) and valence electrons = 6 (the last option: "abbreviated electron configuration = [Ne] \(3s^2\) \(3p^4\) and valence electr…
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26. 12h₂o h = 24 o = 12 27. 5n₂o₄ n = ____ o = ____ 28. 3clf cl = ____ …
H = 24, O = 12 ### Problem 27: \(5\ce{N_2O_4}\)
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rank the following orbitals (4p, 2s, 3d, and 3s) in terms of increasing…
(lowest) 2s < 3s < 3d < 4p (highest)
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read this! a well - written research question states the independent an…
What is the effect of the amount of Alka - Seltzer® on the rate of gas production when it reacts with vinegar? ### For "Boiling Points of Alcohols" experiment:
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for the $^{18}$o (oxygen-18) isotope, how many protons, neutrons and el…
8 protons, 10 neutrons, 8 electrons (the last option: 8 protons, 10 neutrons, 8 electrons)
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2. express the answer to each of the following calculations with the co…
$11.55$ ### Part (b)
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which element has a electron configuration of (1s^2 2s^2 2p^6 3s^2 3p^2…
Silicon, Si
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read this! a well - written research question states the independent an…
What is the effect of the amount of Alka - Seltzer® on the rate of gas production when it reacts with vinegar? ### For "Boiling Points of Alcohols" experiment:
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2. express the answer to each of the following calculations with the co…
$11.55$ (Wait, no, wait: 3.42 + 8.132 = 11.552. The number with the least decimal places is 3.42 (2 decimal places). So we round to 2 decimal places. 11.552: the third decimal is …
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in a chemical reaction there are molecules that react and the products …
### Part 1: Label Reactants and Products in the Chemical Equation #### Explanation: In a chemical equation, **reactants** are the substances that undergo the reaction (on the left…
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chemistry review and reflect back to intro page identify which reaction…
Left reaction (reactants → products with energy given out): Exothermic. Right reaction (reactants → products with energy taken in): Endothermic.
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which of the following scenarios represents the best use of a scientifi…
A. predicting weather patterns
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read this! a well - written research question states the independent an…
- **Independent**: Volume of alcohol - **Dependent**: Boiling point of the liquid - **Controlled**: Type of alcohol, atmospheric pressure, type of container, heat source intensity…
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fill in the blank 4 points humans use a synthetic chemical process to c…
Industrial Nitrogen Fixation ### 2. Plant matter in the soil is fossilized, becoming underground coal.
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4. the above atoms are isotopes of the element lithium (li). how many p…
(for a, assuming Li-6): 3, 3, 3 #### Part b: Atom B (Let's assume Li-7)
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12. write a research question, using the format suggested in the read t…
### Question 13: Identifying Variables in Boiling Point Experiment #### Independent Variable: The independent variable is the one that is manipulated or changed in an experiment. …
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it is ok to turn on the gas valves in class without the teacher’s permi…
B. False
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a well - written research question states the independent and dependent…
### Problem 1.3 Analysis: To identify the variables in the experiment where a student wonders if changing the volume of alcohol affects its boiling point, we analyze each type of …
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3. how many significant figures are in each of the underlined numbers? …
1 ### Part b: 47.70 g of copper
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2. which aspect of bernini’s work greatly influenced the baroque period…
b. Dramatic realism
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complete the chemical equation so that it supports the law of conservat…
### Part 1: Completing the Chemical Equation To balance the equation \( \text{CO}_2 + 6\text{H}_2\text{O} ightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \), we check th…
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c₆h₁₂o₆ + 6o₂ → 6co₂ + 6h₂o + energy 11. in the above chemical reaction…
$\ce{C6H12O6}$ (Glucose) and $\ce{O2}$ (Oxygen) ### Part b
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5. if the alka seltzer was added to water in a closed container, would …
The mass of the container would remain the same.
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of covalent bonds an atom can form usually equals the number of electro…
The structure \( \text{H}-\text{C}=\text{C}-\text{O} \) fails chemically because: - **Carbon atoms**: Each C needs 4 covalent bonds for stability. The left C has 1 (from H) + 2 (f…
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7. fill in the following table: | atom | # of valence electrons | # of …
The filled table is as shown above.
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which one is the dependent variable? time to dissolve water temperature…
Time to dissolve
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chapter 3 review questions 3.1 using and expressing measurements 1. thr…
### Question 1: Analyzing Accuracy and Precision for Each Student #### Colin: - **Precision**: Colin's measurements (47.13, 47.94, 46.83, 47.47) are spread out (range = 47.94 - 46…
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2. i like my coffee sweet, so i add a tablespoon of sugar to my cup of …
The "cup of coffee" now is made up of coffee (with its solutes), water, and dissolved sugar. Yes, it is a mixture (specifically a solution, as sugar dissolves in the aqueous coffe…
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6. diagram the electron distribution of each of the following atoms and…
### Step-by-Step Explanation for Electron Distribution and Reactivity Analysis #### 1. Electron Distribution Basics Electrons fill energy levels (shells) around the nucleus. The f…
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14. when ammonium nitrate (nh₄no₃) explodes, the products are nitrogen,…
18 grams of water would be formed.
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9. the will the house by right to my eldest son! khotso, may your home …
(a) estate; (c) children ### 2. (a) Identifying the figure of speech (example - assume simile for illustration)
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5. if the alka seltzer was added to water in a closed container, would …
### Claim: When Alka - Seltzer is added to water in a closed container, the mass of the container and its contents remains the same. ### Evidence: 1. The law of conservation of ma…
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2. sep use models based on observations of your model, which option is …
c. A compound is made up of two or more types of atoms. ### Question 3
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₁₅³¹p³⁻ element: _____________ atomic #: _____________ # electrons:____…
For $_{15}^{31}P^{3-}$: - element: Phosphorus - atomic #: 15 - # electrons: 18 - atomic mass: 31 For $_{10}^{21}Ne$: - element: Neon - atomic #: 10 - # electrons: 10 - # neutrons:…
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chemistry—unit 2 worksheet 3 problems 1 and 2. calculate the pressure o…
687 mmHg ### Problem 1b:
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which of the following mediums is made from a mix of carbon and clay? a…
C. pencil
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a scientist performed an experiment that had an unexpected result. befo…
The scientist wanted to be sure the results were accurate.
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6. infer yuri conducted an experiment on three metal samples. she creat…
B. Sample #1 is iron; sample #2 is magnesium; sample #3 is aluminum.
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matter is composed of small particles - atoms or molecules - that are i…
scientific theory
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section 2.1 review (pg. 74 - 91) 1. what is a foodborne illness? 2. wha…
A foodborne illness is an illness resulting from consuming food or drink contaminated with harmful agents (microorganisms, chemicals, toxins), causing symptoms like digestive issu…
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energy cannot be created. energy cannot be destroyed. energy can only c…
scientific law
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3.) what are the fizzy bubbles made out of that show up when you toss a…
The fizzy bubbles are made of carbon dioxide ($\boldsymbol{CO_2}$) gas, which is produced by the chemical reaction between ingredients (like sodium bicarbonate and citric acid) in…
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question 14 of 16 when gloves are required for handling sharp edges, ch…
B. Leather gloves
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multiple-choice question why should you not return chemicals to the ori…
They might be contaminated
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each of the following situations could happen in a science classroom. d…
Unsafe practice: Telling the partner to stay still and running to get a cup of water to put out the fire. Correct thing to do: Use a fire blanket to smother the fire or tell the p…
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which topic is commonly used to explain activation energy and how chemi…
B. collision theory
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free energy reaction progress which line indicates a higher reaction ra…
B because it has a lower activation energy
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consider the following chemical equation in equilibrium. h₂so₄(aq) ⇌ 2h…
D. The chemical equilibrium will shift to the left.
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magnesium oxide does not readily decompose into magnesium and oxygen. t…
A. temperature
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demonstrate understanding 1. create a table that describes four states …
| State of Matter | Shape | Volume | Particle Arrangement | Particle Motion | Compressibility | | ---- | ---- | ---- | ---- | ---- | ---- | | Solid | Definite | Definite | Closely…
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according to le chatelier’s principle, what happens to the equilibrium …
The value of the equilibrium constant (K) remains the same.
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which best explains why sawdust burns more quickly than a block of wood…
More molecules in the sawdust can collide with oxygen molecules.
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which lists all of the substances that appear in equilibrium constant e…
B. pure gas and aqueous solution
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consider the chemical equilibrium of the reaction agcl(s) ⇌ ag⁺(aq) + c…
The chemical equilibrium of the system shifts to the left.
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which statement correctly describes a reaction in dynamic equilibrium? …
B. At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change
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a change in which factor will affect the rate of reaction only when gas…
B. pressure
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demonstrate understanding 1. create a table that describes four states …
| State of Matter | Shape | Volume | Particle Arrangement | Compressibility | | ---- | ---- | ---- | ---- | ---- | | Solid | Definite | Definite | Closely packed, ordered | Low (n…
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what does this piece of evidence best support? ○ the collision theory ○…
the collision theory
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consider the following reversible reaction. co(g) + 2h₂(g) ⇌ ch₃oh(g) w…
B. $K_{eq} = \frac{[\text{CH}_3\text{OH}]}{[\text{CO}][\text{H}_2]^2}$
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which will not appear in the equilibrium constant expression for the re…
[C]
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consider the chemical equilibrium of a soap that is present in its aque…
B. The equilibrium will shift to the left to such an extent that it leads to the precipitation of solid soap.
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consider the following equation in chemical equilibrium c₂h₄(g) + h₂(g)…
The amount of ethane increases.
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which statement best applies collision theory to preventing a dangerous…
D. Keep the reactants in separate containers.
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what happens as the activation energy increases? the pressure of the sy…
D. The reaction begins to slow down.
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consider the reaction. 2so₂(g) + o₂(g)⇌2so₃(g) when does the given chem…
D. when the rates of the forward and reverse reactions are equal (assuming the options are labeled A to D with the last option as D; if original labels were different, adjust acco…
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a reaction occurs when solid x is placed into solution y. as a result, …
A. It increased the number of molecular collisions.
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the dissociation of a weak electrolyte is suppressed when a strong elec…
a strong electrolyte with a common ion is added to the weak electrolyte solution.
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consider the equation below. caco₃(s)⇌cao(s) + co₂(g) what is the equil…
\( K_{eq} = [\text{CO}_2] \)
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according to le chatelier’s principle, what happens when the concentrat…
The equilibrium shifts to the right to favor the formation of products.
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consider the reaction h₂(g) + i₂(g) ⇌ hi(g) with an equilibrium constan…
The equilibrium will shift to the left to favor the reactants.
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according to le chateliers principle, what happens to the equilibrium c…
The value of the equilibrium constant (K) remains the same.
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according to le chateliers principle, a system in chemical equilibrium …
A. reduces the stress
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according to le chatelier’s principle, which statement is true? the equ…
B. The equilibrium constant changes with a change in temperature.
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consider the reaction in chemical equilibrium. cocl₂(g) ⇌ co(g) + cl₂(g…
\( K = \frac{[\text{CO}][\text{O}_2]}{[\text{COO}_2]} \) (Assuming the reactant is \( \text{COO}_2 \) and products are \( \text{CO} \) and \( \text{O}_2 \); the correct option sho…
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consider the chemical equilibrium of the reaction. nh₄oh(aq) ⇌ nh₄⁺(aq)…
The chemical equilibrium will shift to the left.
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consider the following chemical reaction in equilibrium. ch₃cooh ⇌ ch3c…
The chemical equilibrium of the system will be unaffected.
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consider the chemical reaction in equilibrium. aa(aq) + bb(aq) ⇌ cc(aq)…
value of \( K \) does not change
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consider the chemical equation in equilibrium. ch₄(g) + h₂o(g) ⇌ co(g) …
A. The equilibrium will shift to the left to favor the reverse reaction.
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which represents the correct equilibrium constant expression for the re…
\( K_{eq} = \frac{[Cu^{2+}]}{[Ag^+]^2} \)
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consider the reaction below. pcl₅(g)⇌pcl₃(g) + cl₂(g) at 500 k, the rea…
0.042
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consider the equilibrium system below. nh₄cl(s)↔nh₄cl(g) if the system …
The rate of sublimation of the $\ce{NH4Cl}$ crystals is equal to the rate of solidification of the $\ce{NH4Cl}$ vapors
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in the atmosphere, under the effect of ultraviolet rays, oxygen molecul…
The rates of the forward and reverse reactions will remain the same.
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consider the general reversible reaction. aa + bb \\longleftrightarrow …
\( K_{eq} = \frac{[C]^c[D]^d}{[A]^a[B]^b} \) (the last option among the given choices)
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consider the following reversible reaction. 2h₂o(g) ⇌ 2h₂(g) + o₂(g) wh…
\( K_{eq}=\frac{[H_2]^2[O_2]}{[H_2O]^2} \) (the last option among the given choices)
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consider the reaction. 2hf(g)⇌h₂(g) + f₂(g) at equilibrium at 600 k, th…
A. \( 2.1\times 10^{-2} \)
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carbon monoxide (co) reacts with hydrogen (h₂) to form methane (ch₄) an…
\( 5.9 \times 10^{-2} \) (corresponding to the option "5.9 x 10⁻²")
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the reaction below is at dynamic equilibrium. n₂(g) + 3h₂(g)⇌2nh₃(g) wh…
The rate of the forward reaction equals the rate of the reverse reaction.
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which statement correctly defines dynamic equilibrium? ○ at dynamic equ…
A. At dynamic equilibrium, the rates of forward and reverse reactions are equal.
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1. define matter 2. list the 2 types of properties of matter with an ex…
The new volume of the gas will be \( 0.52 \, \text{L} \). ### Question 17
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consider the reaction below c₂h₄(g) + h₂(g) → c₂h₆(g) which change woul…
D. increase temperature and increase pressure (Note: Assuming the options are labeled A - D as per typical multiple - choice, with the last option being D. If the original options…
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free energy (y - axis), reaction progression (x - axis). which line ind…
B because it has a lower activation energy
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an increase in temperature affects the reaction rate by ○ decreasing th…
B. increasing the number of molecules that have sufficient kinetic energy to react
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which will cause an increase in the reaction rate between molecules? ○ …
B. Molecules collide more frequently.
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a solid reactant is placed into a beaker of a warm water. the liquid vi…
B. Fewer bubbles will be produced because of fewer collisions of reactant molecules.
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consider the reaction below 2nh₃(g) ↔ n₂(g) + 3h₂(g) which is most like…
The reaction rate decreases.
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ben observes how quickly some dry wood is burning in a campfire. which …
A. reaction rate
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consider the germanium atom. part 1 of 2 write the condensed electron c…
\([Ar]3d^{10}4s^{2}4p^{2}\)
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which applies to the collision theory? particles need to collide in ord…
A. Particles need to collide in order to react.
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what does this piece of evidence best support? the collision theory the…
the collision theory
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directions: below are several elements in a series. write their symbols…
Bi, O, L, Og, Y (forming BIOLOGY) ### Problem 18: