Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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ella thought that all birds could do was tweet. then her friend showed …
C. accommodation.
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question 1 of 1 the shipping department at great chemical company has p…
Product Identifier
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counting atoms worksheet 1. record the number of each atom in each mole…
- Li: 8 - O: 4 - Total: 12 ### Problem 4: \( \text{Li}_2\text{SO}_4 \)
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4 - chemical systems and equilibrium (part 1) k/u - true or false quest…
True ### Question 7
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ive #4 - chemical systems and equilibrium (part 1) question 5 (1 point)…
B. decreasing the temperature (assuming options are labeled as A. adding a catalyst, B. decreasing the temperature, C. increasing $\ce{N_{2}}$ amount, D. decreasing pressure)
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2. two-thirds of the modern periodic table is made up of metals. so whe…
s (Sample for Key Parts): ### (1)a. Potassium (K) (or Sodium (Na), Cesium (Cs)) ### (1)b. Vigorous fizzing, flame (K), rapid movement, melting (Na) ### (1)c i. 1; ii. 4 (for K) ##…
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question 4 of 10 human development may change depending upon the enviro…
B. pliable
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#4 - chemical systems and equilibrium (part 1) an open bottle of pop qu…
the mixture gets darker and then lighter
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counting atoms worksheet 1. record the number of each atom in each mole…
### Problem 2: $\boldsymbol{\ce{HNO3}}$ # Explanation: ## Step1: Contar átomo de H En $\ce{HNO3}$, el subíndice de H es 1, así que hay 1 átomo de H. ## Step2: Contar átomo de N El…
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question 2 of 2 for the area identified, choose the label component tha…
Pictogram
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4 - chemical systems and equilibrium (part 1) question 1 (1 point) whic…
The forward rate of rxn = reverse rate of rxn ### Question 2
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question 2 of 3 what chemical is listed as the hazardous ingredient? su…
B. Sulfuric Acid (assuming the options are labeled with A for ABC Acid, B for Sulfuric Acid, C for Propane)
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question 2 of 3 your supervisor asks you to run inventory on the chemic…
The bottom - left blue box labeled "Identification"
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question 1 of 3 someone just cleaned the bathroom at work. you walk int…
Toxicological Information
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what literary element is most likely to indicate a texts attitude or to…
B. Imagery
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categorization 5 points categorize each of the following properties of …
### 1. Expansion upon freezing: - water expands when it freezes - ice floats on top of the water - aquatic organisms can survive in lakes and ponds even in the winter when ice for…
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bcd chemical distributors has prepared a barrel of hazardous chemicals …
A. SDS, C. Warning Label
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question 1-11 absorbing some chemicals through the skin over time can c…
A. True
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question 2 of 2 what does the ight to know\ law require from manufactur…
Labels and Safety Data Sheets (the middle option among the three choices)
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who is required to provide information through the right to know law? e…
A. Employers C. Chemical Manufacturers D. Chemical Distributors F. Chemical Importers
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question 20 (1 point) polyprotic acids have multiple $k_{\\text{a}}$ va…
The first \(K_{\text{a}}\) is most significant.
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rmochemical equations which statement is true for most chemical reactio…
The statement "An energy change occurs during the breaking and forming of bonds." (the right - most boxed statement)
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tdsb.elearningontario.ca sday - sem 1 - toronto dsb question 18 (1 poin…
\( 10^{-11} \) (corresponding to the option with \( 10^{-11} \)) ### Question 19
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which statement is true if the $\\delta h_{\\text{rxn}}$ of a reaction …
The reaction is exothermic.
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the $\\delta h_{\\text{rxn}}$ of formation of carbon dioxide is negativ…
The reaction is exothermic. (The option with the text "The reaction is exothermic.")
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sulfur reacts with oxygen to form sulfur dioxide ( \text{so}_2 (g) ), (…
\(-296.8 \, \text{kJ}\) (the option with this value)
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ammonia nh₃ (g), δh_f = -45.9 kj/mol reacts with oxygen to produce nitr…
$-1,267.2\ \text{kJ}$ (the option with -1,267.2 kJ)
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tdsb.elearningontario.ca wednesday - sem 1 - toronto dsb question 15 (1…
3.49 ### Question 16
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the audience through rational thought and reason. point - if this then …
1. Effective (valid syllogism, logical conclusion). 2. Not Effective (false premise undermines logic). 3. Effective (logical analogy, persuasive reasoning). 4. Effective (factual …
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the enthalpy of formation for $\\ce{c6h6(l)}$ is 49.0 kj/mol. consider …
A. endothermic; \( \Delta H_{\text{rxn}} = 49.0 \, \text{kJ} \)
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how is enthalpy used to predict whether a reaction is endothermic or ex…
Top - Left Box (When the enthalpy change of the reaction is positive, the reaction is endothermic.)
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which graph represents an exothermic reaction? images of three graphs s…
The graph on the Left
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manganese dioxide mno₂(s), δh_f = -520.0 kj reacts with aluminum to for…
\(-1,839.6\ \text{kJ}\) (corresponding to the option with this value)
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question 12 (1 point) a titration involving a very weak base with a str…
B. $\text{pH} < 7$ ### Question 13
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hydrogen reacts with chlorine to form hydrogen chloride hcl (g), $\\del…
The enthalpy of the reaction is \(-184.6\space kJ\), and the reaction is exothermic. (Assuming the third option in the boxes is this statement, e.g., if the third box is "The enth…
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question 10 (1 point) use the following information to answer the next …
0.99 ### Question 11
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tdsb.elearningontario.ca day - sem 1 - toronto dsb question 8 (1 point)…
1. $\boldsymbol{\ce{CH3COO^-(aq)}}$ is a stronger conjugate base of weak acid $\ce{CH3COOH(aq)}$ ### Question 9
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2 based on the text, what is the effect of adding molecules or heat to …
B. The container’s air pressure would increase.
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5 questions 1 according to the text, what is pressure? a the speed atom…
C. the force atoms and molecules exert when they strike a surface
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4.) the number of unpaired electrons in an atom can be determined from …
A. 1
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which statement primarily appeals to logos to support the position that…
While it is true that electives may not be explicitly academic, in reality, electives can still help students develop valuable skills, such as critical thinking and creativity.
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question 6 (1 point) saved which of the following species is neither an…
All of these are either an acid or a base as defined by Bronsted - Lowry.
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question 6 (1 point) which of the following species is neither an acid …
E. All of these are either an acid or a base as defined by Bronsted - Lowry. ### Question 7
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19. what scan is conducted to diagnose tbi or cte? 20. define metabolis…
Metabolism is the sum of all chemical reactions in a living organism, including catabolism (breaking down molecules for energy) and anabolism (synthesizing molecules for growth/re…
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2. two - thirds of the modern periodic table is made up of metals. so w…
The sub - field that best applies to this problem is Chemistry (under Natural Science).
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what is a benefit of the frame narrative? a. the use of poetic structur…
C. Since time has elapsed between the action and the retelling, the author can naturally include deep reflections on the events.
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check your understanding 1 fluid ounce (fl oz) = 0.030 liters (l) 1 lit…
\(11200.0\)
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question 4 (1 point) sulfur dioxide is a colourless gas, which smells l…
0.75 (corresponding to the option with 0.75)
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how much energy does the water in this experiment absorb according to t…
\(2508\)
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fill in the blanks to create the lesson question, which is the broad qu…
First blank (volume change): increase Second blank (molecule movement): faster (or more rapidly)
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which two chemists organized elements based on properties such as how t…
Lavoisier and Newlands (the option "Lavoisier and Newlands")
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describe the symmetries of each molecule shown a. benzene b. water c. h…
B. The water molecule has 2 line(s) of symmetry, point symmetry, and the following rotational symmetry(ies) 180°
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missed this? watch kcv: limiting reactant, theoretical yield, and perce…
The theoretical yield of \( \text{NiO} \) is approximately \( \boldsymbol{5.08 \, \text{g}} \) (or more precisely, follow the calculation steps for exact value).
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using the appropriate bond energies, calculate the heat of reaction δh …
\(-183\)
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a potassium atom (atomic number 19) loses an electron while forming a b…
It is a positive ion that has one less valence electron than a neutral potassium atom. (The corresponding option from the choices, e.g., if it's the third option in the list, stat…
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four molecule models are shown. model 1 model 2 model 3 model 4 which m…
A. oxygen gas, represented by the chemical formula O₂
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Question was provided via image upload.
### Example 2: - Atom: \(\boldsymbol{7}\) - Molecule: \(\boldsymbol{2}\) - Element: \(\boldsymbol{2}\) - Compound: \(\boldsymbol{0}\) ### Example 3 (corrected if needed): - Atom: …
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which sentence contains parallel structure? mekhi was finally finished …
D. Mekhi finished his chemistry homework and then finished his essay.
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tdsb.elearningontario.ca dnesday - sem 1 - toronto dsb 0.22 question 2 …
B. $\ce{H+ (aq)}$ (assuming the options are labeled with B as the correct one here, based on the checkmark in the image) ### Question 3
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you can use this periodic table and reference table of acid and base io…
2.70 ### Question 2
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pure water has a ph of 7. pure water ......... options: - is an acid - …
The third option (the one with "is a neutral substance")
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1/21 substance that is dissolved in a solution. solvent solute base sus…
B. Solute (assuming the options are labeled as A. Solvent, B. Solute, C. Base, D. Suspension; if the second option is "Solute", that's the answer)
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milk is a options: mixture, compound, element
A. mixture
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milk is a mixture compound element
A. mixture (assuming the left option is "mixture", middle is "compound", right is "element"; the correct option is the left one labeled "mixture")
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attraction between molecules of the same substance is known as drag the…
cohesion
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nasa image, 2003 this image illustrates the harmful spillover of a air …
A. air pollution from Asia
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these are mixtures that are not the same throughout heterogeneous mixtu…
A. heterogeneous mixtures
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these can only be separated by chemical means. options: stuff, compound…
B. compound
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elements have similar behavior when ○ they are on the left/right to eac…
B. they are above/below each other on the PTOTE. (Note: Assuming "PTOTE" is a typo for "periodic table", the correct reasoning is that elements in the same group (vertical, above/…
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what can be said of all elements in group 1? ○ they have 1 valence elec…
A. They have 1 valence electron
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identify image of colored bars ○ periodic circle ○ periodic table - row…
Periodic Table - Columns
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which subatomic particle(s) give atoms their mass? protons (positive ch…
A. protons (positive charges), C. neutrons (no charges)
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what is an appropriate measurement of the liquid in the 10-ml graduated…
6.7E0
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kristie rene - ace 00:34:07 hide timer? this question has two parts. fi…
d. But eventually, enough voices banded together to make a stink that is strong enough will convince people to solve the problem.
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1. which of the following compounds exhibits only dispersion and dipole…
E. $\ce{PF3}$
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rohan and his family are driving to south padre island for spring break…
B. a closed system
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what evidence from meteorites helps us understand earths formation? how…
Meteorites (especially primitive chondrites) have chemical compositions matching early solar system material, isotopic ratios for dating formation events, and presolar grains show…
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50 and went into his den, for well he knew the silly fly would soon be …
It creates a scheming tone
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questions, page 2 which of the following are chemical changes? a) wood …
a) Wood burning, b) Milk going sour, g) Using a hot pack to keep warm, h) Baking a cake ### Second Sub - Question (What happens in all chemical changes?)
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questions, page 1 which one of the following changes involving water is…
s: First Question: b) Pure sodium reacts with water to make \( \ce{H2} \) gas Second Question: d) Change in color
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these words imply a chemical change these words do not... corrode explo…
- These words imply a chemical change: Corrode, Explode, Ferment, Rot, Rust, Photosynthesis, Burn (combust), Tarnish - These words do NOT imply a chemical change: Mix, Vaporize, F…
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5. calculate δh for the reaction: c₂h₄(g) + h₂(g) → c₂h₆(g) from the fo…
$\boldsymbol{\Delta H = -136.8\ \text{kJ}}$ (or -137 kJ, depending on rounding)
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macbeth act 2 scene 1 inner thoughts instructions: macbeth is a play in…
### 1. Macbeth means he will give Banquo honor/rewards if Banquo supports his plans (likely related to the witches’ prophecies and his schemes). ### 2. Banquo feels wary/suspiciou…
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from the pobble who has no toes i. the pobble who has no toes had once …
1. a b a b c d c d
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le chateliers principle says that when changes are made to a system at …
A. oppose the change, and return to equilibrium
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all of these factors can affect (stress) an equilibrium reaction except…
B. solubility
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to maintain chemical equilibrium, reactions must be in a(n) (1 point) c…
A. closed system
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4. ethene, c₂h₄(g) is used in the manufacture of many polymers. if ethe…
The molar enthalpy of formation for ethene is \(\boldsymbol{+52.6\space kJ/mol}\)
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what are two important things that need to be considered when designing…
Two important things are: 1. Safety (e.g., proper handling of chemicals, use of safety equipment) to protect oneself and others. 2. Control of variables (identifying independent, …
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press on an item in the answer box, and then press on the box under the…
### Kinetic Energy: - light - running - heat ### Potential Energy: - a book on a high shelf - stretched rubber band - chemical
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choose one of the factors from the previous question and explain how it…
Let's choose "Temperature" as the factor. According to collision theory, reaction rate depends on effective collisions (sufficient energy + correct orientation). Increasing temper…
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explain three factors that can affect reaction rate in a chemical react…
Three factors affecting chemical reaction rate are: 1. **Concentration (or Pressure for Gases)**: More reactant particles per volume → more frequent collisions → faster reaction. …
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for the equation shown below, use le chatelier’s principle to identify …
- Adding more heat: Shift left - Taking away hydrogen: Shift left - Increasing the pressure: Shift Right - Removing ammonia (\(NH_3\)): Shift Right
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matching list listen match each example to the type of energy it repres…
holding a rock above the ground - a. potential energy ### 2. For "a rolling ball":
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energy stored in a molecule a. chemical energy ability to do work b. en…
- energy stored in a molecule: a. chemical energy - ability to do work: b. energy - energy of motion: d. kinetic energy - amount of energy that is stored in an object: e. potentia…
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task card #2 what are the 3 parts of an atp molecule? name the elements
The three parts of an ATP molecule are adenine (a nitrogen - containing base), ribose (a 5 - carbon sugar), and three phosphate groups. The elements are Carbon (C), Hydrogen (H), …
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balance the equation mgcl₂ + k₃po₄ → mg₃(po₄)₂ + kcl
$3\ce{MgCl_{2}} + 2\ce{K_{3}PO_{4}} ightarrow \ce{Mg_{3}(PO_{4})_{2}} + 6\ce{KCl}$
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name: 1. write the chemical reaction for the oxygen candle and balance …
The chemical reaction for the oxygen candle (using sodium chlorate) and its balanced form is $\boldsymbol{\ce{2NaClO3 -> 2NaCl + 3O2}}$ (Note: If a different reactant like potassi…
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balance the equation mgcl₂ + k₃po₄ → mg₃(po₄)₂ + kcl
\( 3\text{MgCl}_2 + 2\text{K}_3\text{PO}_4 ightarrow \text{Mg}_3(\text{PO}_4)_2 + 6\text{KCl} \)
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guided case study in january 2024, the door blew off an alaska airlines…
$\ce{2NaClO3(s) -> 2NaCl(s) + 3O2(g)}$ ### Question 2: