化学
化学反応、化学量論、分子構造、元素の性質。
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elements, compounds & mixtures ections: read through each question & fi…
A. An element Color BLACK ### Question 2
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post lab questions 1. two strips of metal each weighing 100 g are place…
The metal with volume displacement $8.8\space mL$ is $Pb$ (Lead) and the metal with volume displacement $37.0\space mL$ is $Al$ (Aluminum).
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e compounds v solutions 1. chemical formulas can be used to describe __…
1. Chemical formulas can be used to describe $\boldsymbol{\text{compounds}}$ not $\boldsymbol{\text{solutions}}$. ### 2.
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section: the geosphere read the passage below and answer the questions …
Since no specific[SSE Completed, Client Connection Error][LLM SSE On Failure]
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english ii work: james’s chapter seminar prep udent - led seminar on ja…
### For $\boldsymbol{_3^7Li}$ (neutral atom) # Explanation: ## Step1: Identify Element Name The atomic symbol is $Li$, so the element name is Lithium. ## Step2: Determine Mass Num…
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which statement is an observation rather than an inference? * ○ the dog…
B. The temperature outside is 75 degrees Fahrenheit ### Second Question:
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which of the following is a pure substance that cannot be broken down i…
C. chemical element
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which of the following is a pure substance that can be broken down into…
D. compound
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what group reviews scientific studies for reliability? a. peer reviewer…
a. Peer reviewers ### Second Question:
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which of the following are physical properties of matter? answer: a sta…
C. density
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what chemical in vaping aerosols can cause lung irritation? a. acrolein…
a. Acrolein ### Second Question:
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how are kinetic energy and thermal energy related? kinetic energy only …
D. Thermal energy is the total kinetic energy of particles in a substance. (Note: Assuming the options are labeled A - D in order, with the last option being D. If the original la…
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which of the following are chemical properties of matter? answer: a mas…
D. flammability
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why is nicotine dangerous for teenagers? a. it is not addictive for tee…
b. It disrupts brain development ### Second Question: What harmful compounds are found in vape aerosols?
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the following picture would be best described as answer: a a solid mixt…
B. a gaseous mixture
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name: teacher: date: q1 chemistry: u2l1 the atom & subatomic particles …
d. -3 ### Question 2
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glucose is an example of a(n) answer: a element b compound c homogeneou…
B. compound
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the law of conservation of mass is best described as which of the follo…
B. Matter can neither be created nor destroyed.
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question 6 which of the following statements is not true? gaseous water…
The statement that is NOT true is: Solids, liquids, and gases all have the same density no matter how much energy is added. (The option with this statement)
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question 5 which particles are in fixed positions and hold a definite s…
A. Solids
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the answer to the calculation below with the correct number of signific…
D. 46
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which of the following is not a part of the kinetic molecular theory? a…
C. All particles stay in fixed positions.
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which particles are very far apart from each other, are constantly movi…
C. Gases
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what volume is indicated in the following illustration? include a unit …
24 mL
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what volume is indicated in the following illustration? include a unit …
34 mL
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fill in the blanks with the correct numerical value rounded appropriate…
First blank: $4.98$ Second blank: $4.87$
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chemical property __ 8. flammability __ 9. combustion __10. oxidation _…
8. K. Will the material burn? 9. J. How quickly a material will burn 10. L. Will the substance combine with oxygen (rust)? 11. I. How acid or basic a substance is 12. H. The abili…
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physical property __1. melting point __d__2. thermal conductivity __a__…
1. E 2. D 3. A 4. F 5. G 6. C 7. B
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why are scuba tanks stored in the shade rather than the sun? use a gas …
SCUBA tanks are stored in the shade because of the ideal gas law (\( PV = nRT \)) (or Gay - Lussac's Law for constant volume: \( \frac{P_1}{T_1}=\frac{P_2}{T_2} \)). The tank has …
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7. **represent a bohr model for an ion with a charge of +3, 8 protons, …
- **Bohr Model**: Nucleus (8 protons, 7 neutrons), first electron shell: 2 electrons, second electron shell: 3 electrons. - **Observations**: - Identity: Oxygen - Symbol: \( \ce{^…
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(b) for a stable, neutral atom, how many protons, neutrons, and electro…
For a stable, neutral carbon atom (most commonly carbon - 12): Protons = 6, Neutrons (in \( ^{12}\text{C} \)) = 6, Electrons = 6. For \( ^{13}\text{C} \) (also stable), Neutrons =…
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this table compares four metals. | metal | melting point (°c) | density…
Zinc
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name: shylo stuart teacher: date: q1 chemistry: u2l1 the atom & subatom…
d. -3 ### Question 2
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question 3 a piece of wood is set on fire and is allowed to burn. which…
The log would change color and texture.
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a piece of iron chain is left in water for a few days and changes color…
D. rusting.
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name: ____________ teacher: ____________ q1 chemistry: u2l1 the atom & …
s: 1. d. -3 2. a. 32 3. b. -2 4. b. 14
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remplis le tableau. ia (alcalins exemple) iia (alcalino- terreux) iiia …
To fill in the table for the 3rd period elements (3ᵉ période) of the periodic table, we analyze each group (IA to VIII A) : ### Part (c) : Ions formés par les éléments de la 3ᵉ pé…
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how can you promote a website? a sign up for google analytics. b hire a…
C. Submit the site to search engines.
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active reading section: the geosphere read the passage below and answer…
a. five ### Vocabulary Development (assuming we need to solve the remaining or check, let's take question 6: mesosphere)
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weathering and erosion vocabulary use the words in the chart below to f…
Acid rain ### Question 2
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399. a sample of an unknown metal has a mass of 35.4 g and a volume of …
The density of the metal is approximately $\boldsymbol{11.4\ \text{g/cm}^3}$, and the metal is likely lead (or the specific metal corresponding to the density in Table 2.4).
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weathering and erosion vocabulary use the words in the chart below to f…
Acid rain ### 2.
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more different elements chemically a. a chemical ______ is the combinat…
formula ### Part b
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speeds up the rate of a chemical reaction catalyst sucrose protein subs…
A. Catalyst
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check for understanding ii - onions & bulbs / flowering ve fruits & veg…
C. Sulfur
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c + 2h₂ ⇌ ch₄ if some ch₄ is removed, which direction will the equilibr…
The equilibrium will shift to the right, forming more \( \text{CH}_4 \).
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1. what is a binary compound? binary compounds are compound made up of …
A binary compound is a chemical compound composed of exactly two different elements. ### Question 2
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n₂ + 3h₂ ⇌ 2nh₃ if more nh₃ is added, which direction will the equilibr…
The equilibrium will shift to the left, forming more $\ce{N2}$ and $\ce{H2}$.
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question: which term correctly describes a substance with a ph of 7? op…
B. Neutral
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2h₂o₂ ⇌ 2h₂o + o₂ if more o₂ is added, which direction will the equilib…
The equilibrium will shift to the left, forming more \( \ce{H2O2} \).
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active reading section: the geosphere read the passage below and answer…
A. five ### Question 2:
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rogue heart by axie oh (excerpt) the dreamers gather in neo beijing’s s…
C. a smooth, curving movement
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download or print the pdf for this lesson and follow along notice and w…
A. 3D pattern.
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2h₂o₂ ⇌ 2h₂o + o₂ if more o₂ is added, which direction will the equilib…
The equilibrium will shift to the left, forming more \( H_2O_2 \).
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based on the particle model, which part is favored at equilibrium? grap…
Reactant
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what is the independent variable in this science experiment? the size o…
D. The type of salt is the independent variable.
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day 1: download or print the pdf for this lesson and follow along in th…
D. The size of the crystals is the dependent variable.
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based on the particle model, which part is favored at equilibrium? grap…
Product
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is the reaction shown on the graph at equilibrium at t = 5?
Yes, the reaction is at equilibrium at \( t = 5 \) because the concentrations of reactant (R) and product (P) are constant (not changing with time) at that time.
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1: download or print the pdf for this lesson and follow along the notic…
B. Which type of salt forms the largest crystals? (assuming the second option is B; adjust identifier if needed based on actual numbering)
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lab safety 1. keep your work area clean and clear. 2. follow your teach…
To solve the word search for "Lab Safety" related terms, we systematically check each word from the list against the grid: ### Step 1: Identify Remaining Words From the list (auto…
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day 1: download or print the pdf for this lesson and follow along in th…
B. There is not a control in this experiment
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ex2 1. name the following chemical formula for the following a. common …
The chemical formula for common salt (sodium chloride) is $\boldsymbol{NaCl}$. ### Part (b): Sand
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thermodynamics 3.11 an electric heater supplies 25.0 joules of energy t…
s: (a) \( \boldsymbol{\approx 17.8 \, ^\circ\text{C}} \) (b) \( \boldsymbol{\approx 30.6 \, ^\circ\text{C}} \) (c) \( \boldsymbol{\approx 33.8 \, ^\circ\text{C}} \) (d) \( \boldsy…
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day 1: download or print the pdf for this lesson and follow along in th…
B. what type of salt forms the largest crystals
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day 1: download or print the pdf for this lesson and follow along in th…
The type of salt is the independent variable. (Assuming the third option's text is "The type of salt is the independent variable" after correcting the typo. If the options are lab…
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oad or print the pdf for this lesson and follow along and wonder scienc…
C. The type of salt is the independent variable (assuming the options are labeled A, B, C, D with C being "The type of salt is the independent variable").
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question 1 (2 points) convert 13.4 x 10⁹ milliliters to deciliters a 1.…
d. \(1.34\times 10^{7}\ dL\)
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what is the control in this science experiment? there is not a control …
C. The type of salt is the control. (Assuming the options are labeled A, B, C, D as: A. There is not a control in this experiment. B. The color of the food coloring is the control…
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formation of sedimentary rocks the formation of sedimentary rocks is ca…
### Filling the Blanks (based on Sedimentary Rock Formation Knowledge) 1. **First Blank (Formation Name)**: The formation of sedimentary rocks is called **Lithification**. (Explan…
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rachel is performing an acid-base titration. she hopes to determine the…
D. buret
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rachel is performing an acid-base titration. she hopes to determine the…
D. buret
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claim, evidence, reasoning, chemical bonds cer is a strategy used to co…
The smallest components of the diet (atoms from nutrients) combine through chemical bonds to form larger biological molecules.
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the accepted value for the density of liquid mercury is 13.5336 g/ml. f…
Dr. Tyler, who measures 13.5336 g/mL.
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isotopes: trouver le message dans le tableau ci - dessous, complète les…
To solve for the missing values in the isotope table, we use the following relationships: - **Atomic Number (Z)** = Number of Protons = Number of Electrons (for neutral atoms). - …
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write the formula for each of the following compou 31) sodium bromide _…
31) \( \text{NaBr} \) 32) \( \text{CaI}_2 \) 33) \( \text{FeSO}_4 \) 34) \( \text{Al(NO}_3\text{)}_3 \) 35) \( \text{K}_3\text{PO}_4 \) 36) \( \text{CuCl} \) 37) \( \text{Mg}_3\te…
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for propane, the $\\delta h^\\circ$ of vaporization is 22.9 kj/mol and …
The boiling point of propane is approximately \(\boldsymbol{231\space K}\) (or more precisely around \(231.3\space K\))
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at what temperature, in °c, is a certain reaction at equilibrium if δh …
The temperature at which the reaction is at equilibrium is approximately \(\boldsymbol{234^{\circ}C}\) (or more precisely around \(234.5^{\circ}C\) depending on rounding during ca…
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a reaction will be spontaneous at all temperatures if ______
$\boldsymbol{\Delta H < 0}$ (enthalpy change is negative, exothermic) and $\boldsymbol{\Delta S > 0}$ (entropy change is positive, increase in disorder)
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calculate $\\delta g^\\circ$ for the reaction \\( \\text{cao (s)} + \\t…
$\boldsymbol{-130.5\space kJ/mol}$
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write the name for each of the following compounds. 1) nacl 16) kbr 2) …
1) Sodium Chloride 2) Calcium Bromide 3) Iron(III) Oxide 4) Aluminum Sulfate 5) Potassium Carbonate 6) Copper(II) Nitrate 7) Magnesium Oxide 8) Zinc Chloride 9) Silver Sulfide 10)…
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determine $\\delta g^\\circ$ for the reaction at $25\\ ^\\circ\\text{c}…
The value of $\Delta G^\circ$ for the reaction at $25^\circ\text{C}$ is $\boldsymbol{70.6\ \text{kJ}}$ (per mole of reaction as written).
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consider the reaction, hq ⇌ h⁺(aq) + q⁻(aq) at 298 k, the δs_rxn = -81.…
The value of \(\Delta H_{rxn}\) is approximately \(51.9\space kJ/mol\) (or \(51.862\space kJ/mol\) depending on the level of precision required).
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consider the following reaction at 25 °c: 5 so₃(g) + 2 nh₃(g) → 2 no(g)…
The temperature at equilibrium is approximately \(\boxed{75.4\space K}\) (or \(- 197.75^{\circ}C\)). Wait, but let's check the calculation again. \(42400\div562.3\): 562.3*70 = 39…
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consider the following reaction at 25 °c: 5 so₃(g) + 2 nh₃(g) → 2 no(g)…
C. Yes, it is spontaneous because the free energy is negative.
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click to fix any plural or possessive errors below. if there is no erro…
Click "Submit answer" as there are no plural or possessive errors in the sentence "Eugene Krabs met a group of chemists and asked to try on their goggles."
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consider the following reaction at 25 °c: 5 so₃(g) + 2 nh₃(g) → 2 no(g)…
The standard free energy change $\Delta G^\circ$ is approximately $\boldsymbol{-125.2\ kJ/mol}$ (or more precisely, around - 125 kJ/mol depending on rounding during calculation).
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consider the following reaction at 25 °c: 5 so₃(g) + 2 nh₃(g) → 2 no(g)…
To calculate the standard entropy change ($\Delta S^\circ$) for a reaction, we use the formula: $$\Delta S^\circ = \sum nS^\circ(\text{products}) - \sum mS^\circ(\text{reactants})…
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consider the following reaction at 25 °c: 5 so₃(g) + 2 nh₃(g) → 2 no(g)…
The standard enthalpy change (\(\Delta H^\circ\)) for the reaction is \(\boxed{42.4 \, \text{kJ}}\).
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given $\\delta h^\\circ = +257.7\\,\\text{kj/mol}$ and $\\delta s^\\cir…
\(\boxed{151.7}\) (rounded to one decimal place)
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given $\\delta h^\\circ = -19.4\\,\\text{kj/mol}$ and $\\delta s^\\circ…
\(\Delta G^\circ \approx -46.9 \text{ kJ/mol}\) (rounded to three significant figures)
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the $\\delta h_{\\text{dissolve}}$ for oxygen solubility in water at 31…
\(\approx - 108\space J/(mol\cdot K)\) (or more precisely \(- 107.7\space J/(mol\cdot K)\) depending on the level of precision)
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intro to chemistry unit 1 vocabulary class activity c. define each of t…
To solve this, we'll define a few key terms from the list (e.g., "Chemistry", "Scientific Method", "Element") as examples: ### 1. Word: Chemistry # Brief Explanations: Chemistry i…
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which type of medicine reduces pain but can cause liver damage? a. anti…
D. Analgesics
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calculate $\\delta g^\\circ$ for the reaction below at $25\\ ^\\circ\\t…
$\boldsymbol{-4.8\ \text{kJ/mol}}$
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consider the reaction cl₂(g) + br₂(g) → 2 brcl(g) at 25 °c. the change …
B. No, because $\Delta G^\circ > 0$.
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based on what you learned about the economics of organic produce, expla…
The high cost of organic produce is due to factors like labor - intensive farming, expensive inputs (e.g., organic seeds, natural pest control). In direct variation terms, as the …
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4. list three (3) safety rules when using a bunsen burner. 1. 2. 3.
1. Asegurarse de que el quemador esté apagado antes de conectar el gas. 2. No tocar el tubo de combustión cuando esté encendido. 3. Mantener el área alrededor del quemador limpia …
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read this! communication with your teacher in the laboratory can also h…
The teacher can provide a Material Safety Data Sheet (MSDS) which contains safety information about the chemical. ### 10b
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write an answer to the guid what are atoms?
Atoms are the fundamental, chemically - indivisible particles that make up all matter. Each atom has a nucleus containing protons (positively charged) and neutrons (neutral), with…