Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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the movement of the progress bar may be uneven because questions can be…
Linking
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a nurse is caring for a client who is experiencing an acute ischemic ce…
Alteplase
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boron trifluoride gas is collected at -11.0 °c in an evacuated flask wi…
mass: \(6.14g\) mole: \(0.0906mol\)
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the movement of the progress bar may be uneven because questions can be…
B. Cigarettes should be banned because smoking kills not just smokers but the people and animals around them.
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12c. question: are any of the liquids the same substance? directions: u…
To determine if any liquids are the same substance, we examine their physical/chemical properties (from the data table). If two liquids have identical characteristic properties (e…
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12b. question: are any of the liquids the same substance? directions: u…
To determine if any liquids are the same substance, we examine their characteristic physical properties (e.g., density, boiling point) from the data table. If two liquids have ide…
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interesting facts 9. true or false: the suns energy comes from nuclear …
9. False 10. Contienen potasio - 40 (\(^{40}\text{K}\)), un radioisótopo natural. 11. Marie Curie 12. a. Reactores; b. Fusión
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examine the following data table: | | density | color | mass | melting …
Liquid 1 and Liquid 4 are the same substance.
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read the text. in geology, weathering refers to processes that break do…
Assuming the image shows rocks that have been moved (erosion) or broken into pieces (physical weathering). But based on the text, if the image is of rocks broken into pieces (not …
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read the text. solutions are combinations of two or more evenly mixed s…
precipitate
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11. the following represents two substances by showing only one molecul…
C. \( \text{Na}-\text{Cl} \) \( + \) the molecule with O and two H (representing \( \text{H}_2\text{O} \))
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11. the following represents two substances by showing only one molecul…
C. \( \text{Na - Cl} \) \( + \) the molecule with two H and one O (representing \( \text{NaCl} \) and \( \text{H}_2\text{O} \))
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the movement of the progress bar may be uneven because questions can be…
D. This source is not credible because anyone can post or edit information on Wikipedia, whether or not they have expertise in the subject.
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10. water (h₂o) cannot be turned into salt (nacl) through a chemical re…
B. salt and water are made of different atoms.
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9. a student measures the masses of two liquids. one liquid is 14 grams…
B. escaped from the beaker.
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pros and cons of nuclear chemistry 7. list two positive aspects of nucl…
7. a. Generación de electricidad eficiente. b. Aplicaciones médicas (por ejemplo, detección y tratamiento de enfermedades). 8. a. Desechos radiactivos peligrosos. b. Riesgo de acc…
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9. a student measures the masses of two liquids. one liquid is 14 grams…
B. escaped from the beaker.
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8. which statement is always true about conservation of mass? a. the to…
A. The total mass of the reactants is equal to the total mass of the products.
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7. which of the following is always true when a substance undergoes a p…
D. The substance is made up of the same type of molecules.
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determine the mass of mg(oh)2 formed when 250ml of 0.3m mgcl2 reacts co…
\(4.35\space g\)
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6. if a cup of water is sealed and kept at a constant temperature, then…
A. The molecules keep moving at the same average speed.
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5. what does the following diagram best represent? \\bigcirc = mercury …
B. substance
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4. a chemical reaction occurs when a student puts carbon dioxide (co₂) …
\(CO_2 + H_2O ightarrow H_2CO_3\) (The product is carbonic acid, with the chemical formula \(H_2CO_3\))
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if 300ml of 0.4m cuso₄ is reacted with excess naoh, how many grams of c…
\(11.76\space g\)
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3. a student finds two green powders that look the same. he wants to fi…
D. Determine the density, solubility, and melting point of each powder and compare.
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a state in which opposing forces or processes are balanced the general …
1. equilibrium, 2. closed system, 3. law of chemical equilibrium, 4. \(K_{eq}>1\), 5. \(K_{eq}<1\), 6. \(K_{eq} = 1\), 7. aA + bB ⇌ cC + dD, 8. exothermic reaction, 9. endothermic…
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2. a chemical reaction occurs when substances interact and their atoms …
D. rearrange
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grade 7 science: unit 1 – pre- assessment how can i make new things fro…
B. burning marshmallows over a fire
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applications of nuclear chemistry 6. match the application to its descr…
a. Energy Production - Uses fission to generate electricity b. Medical Treatments - Diagnoses and treats diseases like cancer c. Food Safety - Kills harmful bacteria in food d. Ar…
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tdsb.elearningontario.ca question 19 (1 point) use the following inform…
2, 3, 4, 1
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tdsb.elearningontario.ca question 17 (1 point) use the following inform…
4.5 For question 18:
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question 10 (1 point) use the following information to answer the next …
D. 0.42 2.3 mol
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tdsb elearningontario.ca question 15 (1 point) what is the correct equi…
The first option \(K_{eq}=\frac{[N_{2}][Cl_{2}]^{3}}{[NCl_{3}]^{2}}\) is correct.
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question 14 (1 point) hydrogen is the lightest of elements with atomic …
4.3
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a golden shovel can impact the meaning of a poem by using a different p…
A. line to help express certain ideas.
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read the excerpt from \on imagination\ by phillis wheatley. now here, n…
It creates a pensive tone that shows the speaker's feelings on the power of imagination.
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tdsb.elearningontario.ca question 12 (1 point) when the equilibrium con…
the same as # Question 13
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read the excerpt from \we wear the mask\ by paul laurence dunbar. we sm…
rhyme scheme
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complete the following nuclear equation. \\ce{_{94}^{239}pu -> \\square…
\(_{92}^{235}\text{U}\)
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tdsb.elearningontario.ca question 11 (1 point) when a catalyst is added…
Question 11: increases the rate of reaction in both directions Question 12: greater than
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tdsb.elearningontario.ca question 9 (1 point) which of these affects th…
temperature # Question 10
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complete and balance each of the following nuclear equations. part 1 of…
Part 1: \(_{82}^{210}Pb\) Part 2: \(_{1}^{0}e\)
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how much does the mass and charge of a nucleus change when each type of…
Part 1: Change in mass \(=0\), Change in charge \(=- 1\) Part 2: Change in mass \(=-4\), Change in charge \(=-2\)
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question 5 (1 point) in the equilibrium constant expression below, what…
the stoichiometric coefficients from the balanced equation ### Question 6
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tdsb.elearningontario.ca which does not remain constant when a system i…
- First question: molecular reactions - Second question: \(N_2O_4(g) ightleftharpoons2NO_2(g)\)
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tdsb.elearningontario.ca consists only of a reverse reaction consists o…
- Question 2: there is no net change in the concentration of reactants or products - Question 3: molecular reactions
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tdsb.elearningontario.ca sch4u -- unit e -- quiz (equilibrium 20mc+10mt…
consists of both a forward and a reverse reaction
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what change to temperature would increase the rate of diffusion? decrea…
B. Increasing temperature (assuming the options are labeled as A: decreasing temperature, B: Increasing temperature, C: temperature has no effect on the rate of diffusion)
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identifying elements of dramatic structure in poetry father left home o…
characterization, plot, stanzas
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what is mole ratio of b and d in the following reaction? 1 a(g) + 1 b(g…
1:1
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analysis: 1. write a chemical word equation to show the combining of su…
Sulfuric acid + Magnesium → Magnesium sulfate + Hydrogen
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what is the volume of 1 mole of gas at stp? ○ 22.4 l ○ 1.0 l ○ 5.0 l ○ …
A. 22.4 L
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question 21 (10 points) match each item to the correct statement below.…
- "this reaction proceeds at a faster rate when thermal energy is removed from a system": 8. exothermic reaction - "another name for law of mass action": 3. law of chemical equili…
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how many liters of oxygen gas at 21°c and 1.13 atm can be prepared by t…
0.248 L
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question 19 (1 point) use the following information to answer the next …
- **Question 19**: 2, 3, 4, 1 - **Question 20**: is exothermic and heterogeneous
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what is the molar mass of kclo₃? ○ 106. 55 g/mol ○ 122.545 g/mol ○ 110.…
122.545 g/mol
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fill in the blank 12 points find the molar mass (g/mol) of ca(no3)2. el…
164.10 g/mol
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question 16 (1 point) use the following information to answer the next …
D. \(0.42\), \(2.3\ mol\)
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sample response: organic farming would have higher costs, and would be …
A. It could cost more to grow organic crops. B. It could be more complex. D. It could let the Suarez family charge higher prices. E. It could be better for the land.
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what is the molar mass of chlorine (cl₂) gas? ○ 159.808 g/mol ○ 37.996 …
70.906 g/mol
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question 14 (1 point) hydrogen is the lightest of elements with atomic …
4.3 ### Question 15
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shifts equilibrium in one direction question 12 (1 point) when the equi…
- **Question 12**: the same as - **Question 13**: The system will attain equilibrium by moving to the right.
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use the text to compare and contrast microwave ovens and conventional o…
- Are found in most American homes: Microwave ovens (✔), Conventional ovens (✔) - Cook food by heating water molecules: Microwave ovens (✔), Conventional ovens (✖) - Can be used f…
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question 10 (1 point) when the temperature __i__in a system in which th…
A. increases, endothermic, product # Question 11
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fill in the blank question the energy in an apple is an example of stor…
potential; kinetic
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what is the density of co₂ gas at stp? ○ 4.41 g/l ○ 1.20 g/l ○ 1.96 g/l…
1.96 g/L (the option with 1.96 g/L)
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question 7 (1 point) when pressure _i_and volume _ii_the reaction in an…
A. decreases, increases, more
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read the excerpt relating to roger chillingworth from chapter 4 of the …
He has no intention of truly alleviating Hester’s suffering.
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question 8. which of the following diagrams has arrows that point in th…
The second diagram (the middle one with vertical arrow up and horizontal arrow right)
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what type of attractive force is the arrow pointing at in the molecule?…
intermolecular force
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select which of the following standard enthalpy of formation values is …
A. NO(g), C. H(g), E. MnO(s)
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a quantity of $2.00 \\times 10^2$ ml of 0.862 m hcl is mixed with an eq…
\(\boxed{27.2}\) (or more precisely, 27.17, but with significant digits, 27.2 °C)
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a 20.3 g sample of an unknown metal and a 28.5 g sample of copper, both…
\( \boxed{1.08} \) (in \( \frac{\text{J}}{\text{g·°C}} \))
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when pressure _i_and volume _ii_the reaction in an equilibrium system s…
the inert gas reacts with the components of the system ### Question 9
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reacting with water in an acidic solution at a particular temperature, …
After \(3\) hours, the amount of compound \(A\) remaining will be \(0.44\) M. It will take approximately \(1047.8\) minutes until \(0.10\) M of compound \(A\) remains.
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what is the pressure and temperature at stp, respectively? ○ 1 atm, 25°…
C. 1 atm, 0°C (assuming the third option is labeled C; if original labels are different, adjust the identifier but the text is "1 atm, 0°C")
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7 why do gas molecules escape from the exosphere, but not other layers …
- **Question 7**: A. It is the layer farthest from Earth, so there is less gravitational force - **Question 8**: C. Blue light is most likely to be scattered by the atmosphere - *…
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reacting with water in an acidic solution at a particular temperature, …
After 3 hours, the amount of compound A remaining is \(0.44\space M\). It will take approximately \(17.5\space h\) until \(0.10\space M\) of compound A remains.
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question 1 (1 point) a reversible reaction ______. ○ consists only of a…
- Question 1: consists of both a forward and a reverse reaction - Question 2: there is no net change in the concentration of reactants or products - Question 3: molecular reactions
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all of the statues stand outside, in air. air is a mix of gases, but mo…
The Statue of Liberty turned green because its copper surface formed a green patina (copper carbonate hydroxide) via air exposure; the Charging Bull (bronze) has slower/less visib…
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a solution contains 1.23×10⁻² m calcium acetate and 8.73×10⁻³ m lead ni…
$4.85×10^{-12}$
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a solution contains 1.41×10⁻² m cobalt(ii) nitrate and 1.50×10⁻² m zinc…
$4.8\times10^{-7}$
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directions: create a model to help you explain the phenomenon shown bel…
The Statue of Liberty turned green because its copper exterior underwent patina formation: a chemical reaction with oxygen, water, and carbon dioxide in the air, producing green c…
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a solution contains 8.97×10⁻³ m calcium acetate and 1.07×10⁻² m lead ni…
A. $Pb_3(PO_4)_2$ B. $8.1×10^{-19}$ (rounded to two significant figures)
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you are driving your unit to a scene where there has been a chemical ex…
Stay in your vehicle
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a solution contains 1.23×10⁻² m calcium acetate and 8.73×10⁻³ m lead ni…
A. $\text{PbCrO}_4$ B. $3.21\times10^{-11}$
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which of these compounds is likely to be sour and have a ph less than 7…
B. HClO
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2 fill in the blank 1 point what is the formula for calcium chloride ty…
\(CaCl_{2}\)
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which state of matter has the highest entropy? gas liquid solid
A. gas
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ex: mgcl2 1 fill in the blank 1 point what is the formula for sodium br…
\(NaBr\)
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what is the molar concentration of a solution that contains 7.0 mol nac…
3.5
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review questions: 1. complete the statement below with the appropriate …
1. Lose, Gain, Share; Cation, Anion; Lose, Gain, Share; Octet 2. C. Hydrogen (H) and Oxygen (O) 3. B. Ability to conduct electricity when melted or dissolved
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which process requires the release of energy? deposition \t sublimation…
deposition (the process of deposition, where a gas changes directly to a solid, releases energy as it is an exothermic phase change; sublimation, vaporization, and melting are end…
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use the information to answer the question. students are conducting exp…
C. high melting point
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which of the following is not a property of a metallic solid? high melt…
B. amorphous (assuming the options are labeled as A. high melting point, B. amorphous, C. held together by a sea of delocalized electrons, D. high boiling point)
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name: allen winsley jean period: 4 4.1 practice: on your own balance th…
1. 2 Na + 1 Cl₂ → 2 NaCl 2. 2 H₂ + 1 O₂ → 2 H₂O 3. 2 NO → 1 N₂ + 1 O₂ 4. 1 MgCl₂ + 2 K → 2 KCl + 1 Mg 1) 1 AlBr₃ + 3 K → 3 KBr + 1 Al 2) 1 FeO + 1 PdF₂ → 1 FeF₂ + 1 PdO 3) 1 P₄ + …
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what type of solution are metal alloys? liquid-liquid solid-solid liqui…
solid-solid
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what term describes a situation where a solid will not dissolve in a li…
insoluble
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what is the dominant intermolecular force found between formaldehyde mo…
dipole - dipole forces
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which material is solid potassium chloride, kcl, likely to be soluble i…
H₂O