Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which would be least likely to completely dissolve in water? hydrochlor…
acetic acid
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most metals share four common physical characteristics. which of the op…
D. Reactivity
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which is the order of these solutions from strong acid to strong base? …
battery acid → stomach acid → antacid → baking soda → household ammonia
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which is formed by positive ions from a base and negative ions from an …
A. salt
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which solution has the greatest number of hydroxide ions? baking soda, …
baking soda, pH = 9
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a student uses red litmus paper to test the ph value of different solut…
A. soap
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the equation shows reactants to a neutralization reaction. ca^{2+}+oh^{…
$H^+$ binds with $OH^-$ to make water.
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which best describes the ph scale? acids measure below 7. bases measure…
Acids measure below 7.
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apple juice has a lower ph than black coffee. which best explains the r…
Apple juice has more hydrogen ions than black coffee.
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name ______________ quiz 1.1 intro to stoich solve the following proble…
1. \(BaBr_2<BaCl_2<KBr<KF\) 2. \(3.23\times 10^{23}\) molecules 3. \(4.04\times 10^{23}\) molecules 4. \(4.98\ mol\)
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which substance is used in fertilizers? ○ slaked lime (ca(oh₂)) ○ formi…
C. nitric acid ($HNO_3$)
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it is very interesting to study the origin of words in our english lang…
1. Portuguese 2. stupid 3. French bacteriologist and chemist 4. Louis Pasteur 5. To destroy bacteria by heating to a prescribed temperature for a specified time 6. Latin 7. buculu…
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mrs. rushing fills a balloon with hydrogen gas to demonstrate its abili…
Mg and HCl
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why is a protective apron or lab coat important to use when working wit…
Acids break down fabrics and can cause burns if the acids are strong.
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when an old building is to be torn down, mr. phams company removes the …
hydrochloric acid
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who would most likely be required to work with sodium hydroxide? a plum…
A. a plumber
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what is a common use of nitric acid? making ointments making ceramics c…
producing dyes
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lien made this table to organize her notes on the properties of acids a…
B. taste bitter
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while researching life during colonial times, carson learns that people…
making soap
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quiz yourself on chapter 3 assignment: quiz yourself on chapter 3 quest…
B. cutaneous senses
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which substance is used to remove rust from metal? lye (naoh) hydrochlo…
B. hydrochloric acid (HCl)
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a compound that releases hydroxide ions in solution would most likely h…
It would react with lipids to form soap.
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ph, acids and bases quick check which pattern in electronegativity do e…
Electronegativity increases from left to right within a row of the periodic table.
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ph, acids and bases quick check use the reaction to answer the question…
$HCl$ is an acid, and $Cl^-$ is its conjugate base.
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ph, acids and bases quick check which statement best describes the diff…
The substance with the lower pH has 1000 times as many hydrogen ions per volume of water.
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ph, acids and bases quick check how are acids and protons related? (1 p…
An acid can donate protons to a base when they react.
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which statement best describes the effect of the free - verse form in \…
It helps the reader experience the poet's thought process.
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cf₄ + br₂ → cbr₄ + f₂ total # before (reactants) elements total # after…
1$CF_4$ + 2$Br_2$ $ ightarrow$ 1$CBr_4$ + 2$F_2$; | Total # Before (reactants) | Elements | Total # After (Products) | | ---- | ---- | ---- | | 1 | C | 1 | | 4 | F | 4 | | 4 | Br …
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mg + hcl → mgcl₂ + h₂ total # before (reactants) elements total # after…
The balanced equation is $1Mg + 2HCl ightarrow1MgCl_2+1H_2$ and the table values are: for Mg, 1 before and 1 after; for H, 2 before and 2 after; for Cl, 2 before and 2 after.
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write the formulas of the compounds produced from the listed ions.
| | $Cl^-$ | $CO_3^{2 - }$ | $OH^-$ | $SO_4^{2 - }$ | $PO_4^{3 - }$ | $NO_3^-$ | |--|--|--|--|--|--|--| | $Na^+$ | $NaCl$ | $Na_2CO_3$ | $NaOH$ | $Na_2SO_4$ | $Na_3PO_4$ | $NaNO_3…
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which stage of the nitrogen cycle does the arrow in the image represent…
No image is provided to determine the correct answer. Please provide the image for a proper response.
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which of the following features contains the smallest amount of phospho…
A. the atmosphere
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al+ __ i₂ → __ ali₃ |reactants|inventory|products| |----|----|----| | |…
2; 3; 2
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color by number element mixture compound name: ______ date: ______ per:…
1. Compound (red) 2. Element (sky - blue) 3. Mixture (purple) 4. Mixture (blue) 5. Compound (red) 6. Mixture (yellow) 7. Element (yellow - green) 8. Mixture (red - orange) 9. Comp…
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drug tolerance is best defined as ○ a. a condition in which drug users …
A. a condition in which drug users need more of the chemical to achieve the same effects.
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12. the structure of ammonia looks like this: ammonia is a(n)_. 13. ide…
12. Compound 13. Mixture 14. Solid 15. Compound
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what are chemicals called that mimic the actions of neurotransmitters i…
B. Agonist
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who first proposed that matter was composed of atoms? thomson boyle dal…
D. Democritus
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question 1 j. j. thomson and eugen goldstein used the same type of devi…
False
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al+ i₂ → ali₃ reactants inventory products al i remember: coefficients …
$2:3:2$
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sep develop a model use the space to sketch each of the three neon isot…
Sketch a model for neon - 20 with 10 protons, 10 neutrons in the nucleus and 10 electrons in two electron - shells (2 in the first, 8 in the second). Sketch a model for neon - 21 …
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multiple - choice question natural gas is also an example of: hydrogen …
C. Methane
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4. the elements within a ______ can be separated by physical means. 5. …
4. Mixture 5. Compound 6. Mixture 7. Element 8. Mixture 9. Compound 10. Element 11. Mixture
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step 2: measure the reaction rate at ~20 - c (room temperature) your ta…
Temperature of the water: $20$ °C. Reaction time: $34.20$ seconds
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1. molecules that have more than one type of atom chemically bonded tog…
1. Compound 2. Element 3. Mixture
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1ch₄ + 2o₂ → 1co₂ + 2h₂o elements total # before (reactants) total # af…
| Elements | Total # Before (reactants) | Total # After (Products) | |--|--|--| | C | 1 | 1 | | H | 4 | 4 | | O | 4 | 4 | True
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consider methane (ch4) how many molecules of methane do we have? how ma…
How many molecules of methane do we have? 2 How many TOTAL atoms of carbon do we have? 2 How many TOTAL atoms of hydrogen do we have? 8
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part c - identify the incorrect practices in the lab. room and list dow…
1. Not wearing safety goggles. 2. Horse - playing and rough behavior. 3. Eating and drinking in the lab. 4. Not wearing lab coats.
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think about it: molecules and chemical equations how many atoms of carb…
How many atoms of carbon are in one methane molecule? 1 How many atoms of hydrogen are in one methane molecule? 4
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writing names writing names is also straightforward. you use the approp…
a. $CO_2$ b. $P_2S_3$ c. $SiO_2$ d. $N_2O$ e. $H_2O$ f. $Cl_2O$ g. $CS_2$ h. $Br_2$ i. $SO_3$ j. $CO$ k. $CCl_4$ l. $XeF_4$ m. $SO_2$ n. $Ne$ o. $N_2O_4$ p. $SiH_4$ q. $NO$ r. $IC…
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4. after you clean your work area, what should you do before leaving th…
4. Wash your hands. 5. No.
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read the following pages (104 - 108) and write a brief three - paragrap…
(No actual essay is provided as the task is to write an essay following the given guidelines. But the above is a summary of how to approach it.)
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vocab quiz: matter name witter core 1 word bank v.2 a. compound b. mixt…
1. C. Element 2. A. Compound 3. B. Mixture 4. H. Homogenous 5. G. Heterogenous 6. F. Proton 7. J. Electron 8. I. Neutron 9. E. 13 10. D. 27
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check your mastery of 2.4 2.4 focus on research: the case of the disemb…
Neither of the given options is correct.
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6. was dalton’s atomic theory accurate? why? (2 pts.)
No. Later discoveries of sub - atomic particles and isotopes showed its inaccuracies.
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question 4. a student prepared two mixtures, each in a labeled beaker. …
Heat the mixture 1 in a beaker over a Bunsen burner or hot plate. As the water is heated, it will evaporate, leaving the dissolved table - salt (NaCl) behind in the beaker. Use a …
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3) calculate the average atomic mass of lithium (li), which occurs ^6li…
$6.927$ amu
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question 3. given the diagram representing a process being used to sepa…
B. Chromatography
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13 question (2 points) provide the systematic name for the following io…
Part 1: potassium phosphate Part 2: calcium nitrate Part 3: chromium(II) phosphate
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diane draws a picture on a piece of paper and then folds it into a pape…
D. all of these
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question 2. at room temperature, a mixture of sand and water can be sep…
C. filtration
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question 1. equal amounts of ethanol and water are mixed at room temper…
Distillation.
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jolene wants to experiment with sugar cubes. which of the following cau…
1. B. crushing the sugar cube and dissolving it in water 2. B. the appearance of a substance changes but its identity does not.
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two solutions are added together and the new solution becomes hot. this…
1. d) a chemical change is taking place. 2. a) both chemical and physical
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a) a chemical has changed size. b) a chemical has changed to a differen…
1. None of the above options for the first part are chemical changes. They are physical changes (size, state, shape). The correct answer for what indicates a chemical change among…
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review the fourth paragraph. smart food perusing the food choices in ea…
The animals on nonorganic farms are given foods that contain pesticides, which are the source of diseases in people.; Experts think that when animals are treated with antibiotics,…
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1. un gas no tiene definida, y tampoco tiene de definida 2. la distanci…
# Breve Explicación: 1. En los gases, las partículas no tienen una distancia definida entre sí y no tienen fuerzas de atracción definidas, lo que les permite dispersarse y llenar …
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2. el tipo de sólido depende de la manera cómo las están dispuestas. a.…
a. Sólido cristalino b. Sólido amorfo C. 1. Volumen, forma 2. Forma 3. Mayor 4. Menores 5. Viscosidad 6. Cohesión 7. Tensión superficial 8. De atracción, viscosidad D. 1. Forma, v…
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ph measures the acidity of a substance, and is described by the equatio…
$pH = -\log(7.3\times 10^{-4})$
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which of the following scenarios best illustrates the difference betwee…
The volume of water in a beaker increases as more water is added, but the boiling point of the water remains the same.
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1) state two key purposes of john daltons atomic theory. 2) j.j. thomso…
1. To explain matter composition and chemical reactions. 2. Deflection of cathode rays by electric and magnetic fields. 3. Firing alpha - particles at a thin gold foil with a dete…
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question 10. describe the process you would use to determine whether a …
To determine if a substance is pure or a mixture, we can use physical separation techniques like evaporation and filtration and observe properties such as melting/boiling points. …
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which of the following characteristics are not typical of homogeneous m…
A. The presence of multiple phases or layers E. Variable composition depending on the location within the mixture
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elements are organized into families according to their physical and ch…
Alkali Metals - 1 valence electron: Hydrogen (H), Lithium (Li) Alkaline Earth Metals - 2 valence electrons: Calcium (Ca), Magnesium (Mg) Boron Family - 3 valence electrons: Boron …
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question 8. match each example to its correct classification. a) air b)…
a) Homogeneous Mixture b) Homogeneous Mixture c) Element d) Element e) Heterogeneous Mixture f) Compound g) Compound h) Homogeneous Mixture
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question 7. given the particle diagram: key o = atom of an element ● = …
A. A compound
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homework 7 - 09/19/2025 question 6. which statement describes a mixture…
It is heterogeneous, and its components are in different phases.
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question 5. a pure substance is classified as either a(n) or a(n)
element, compound
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question 4. is the following statement true or false? if the statement …
False. A homogeneous mixture is one that has a completely uniform composition.
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8. what type of element does the neon green color indicate? list the el…
8. Cannot be determined without more context. 9. 5 elements: F, Cl, Br, I, At 10. a. Salt - former. b. Hydrogen - halide molecule. 11. Alkaline - earth metals 12. Metalloid family…
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question 3. classify the following examples as a homogeneous or heterog…
a) Homogeneous Mixture b) Heterogeneous Mixture c) Homogeneous Mixture d) Homogeneous Mixture e) Heterogeneous Mixture f) Heterogeneous Mixture g) Heterogeneous Mixture h) Homogen…
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pure substance mixture element compound homogeneous mixture heterogeneo…
- Pure substance: A sample of matter, either a single element or a single compound, that has definite chemical and physical properties. - Mixture: A physical blend of two or more …
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batteries are filled with: ○ a. ascorbic acid. ○ b. sulfuric acid. ○ c.…
B. Sulfuric acid
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1. below is a flowchart representing the classification of matter. comp…
From left - to - right, top - to - bottom: Heterogeneous Mixture, Homogeneous Mixture, Element, Compound
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6) what was the most surprising observation from rutherfords gold foil …
6. A small fraction of alpha particles were deflected at large angles. 7. A small, dense, positively - charged nucleus at the center with electrons orbiting around it. 8. b. Ruthe…
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four beakers and their contents are listed below. | beaker | mixture | …
D. Beaker 3
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select the independent clause. after a lightning bolt passes through th…
the compression and subsequent rapid expansion of the air molecules produces the booming sound of thunder
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1) john daltons atomic theory proposed that all elements are composed o…
1. atoms 2. properties 3. electrons 4. c) Plum pudding model 5. alpha particles
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9/19/25 and 9/22/25 answer in complete sentences or complete thought 1.…
1. There are 7 rows on the periodic table. 2. There are 18 columns on the periodic table. 3. The periodic table is arranged by increasing atomic number. 4. The maximum number of e…
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read the rough - draft paragraph. (1) many people experience a sense of…
C. 3
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in the laboratory, giselle has a mixture of water and rubbing alcohol. …
B. physical change
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pablo is making a solution. he puts 1 g of sugar into 1 l of water. whi…
B. a physical change
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a chemical change of matter takes place when one or more substances cha…
Vinegar bubbles when baking soda is added.
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a chemical change of matter takes place when one or more substances cha…
Vinegar bubbles when baking soda is added.
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there are several differences between chemical and physical changes. wh…
D. A chemical change can produce warmth.
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when paper is burned, the mass of the remaining ash is less than the ma…
B. Some of the mass is lost as it escapes in smoke.
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chemical changes result in new substances, but physical changes do not.…
A loaf of bread being sliced into pieces.
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rita wants to make some toast for breakfast. she puts a slice of bread …
B. added warmth
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what should a scientist do if they want to speed up the chemical reacti…
Increase the temperature of the substance
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increasing the temperature during a chemical reaction will decrease the…
True