Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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the vapour pressure of ether (mol mass = 74) is 442 mm hg at 293 k. if …
123 g/mol
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when propane is reacted in the presence of oxygen gas, the products of …
$CO_2 + H_2O$
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the reactants in a combustion equation are always carbon dioxide and wa…
B. False
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unit 2 the atom test part 1 multiple choice: select the letter choice t…
1. B. 9 neutrons and 8 electrons 2. A. protons 3. D. contains nearly all of the atom’s volume 4. B. The one with an atomic mass of 11.01 5. A. 5 6. D. 11 7. A. 2 8. B. 3 9. C. str…
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how many signals would be present in the ¹hnmr?
4
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how many signals would be present in the ¹hnmr?
6
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primary municipal wastewater treatment... operates to allow suspended s…
Operates to allow suspended solids to settle out of solution.
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the ph scale is a measure of acidity and runs from 0 (most acidic) to 1…
d) Buffer
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any substance dissolved in water is called a a) concentration b) salt c…
c) solute One reason water's solvent property is important for living organisms is that it aids in the transportation of nutrients to cells.
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21. what element of art refers to a closed line that can be geometric o…
C. Shape
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2. what is the chemical formula for this oligosaccharide? c6h12o6 c18h3…
2. D. $C_{18}H_{32}O_{16}$ 3. C. Water is needed for hydrolysis to take place. 4. D. $C_{24}H_{42}O_{21}+3H_2O$
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1. which of the following is a molecule of glucose? o molecule a o mole…
molecule C
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question 1 (mandatory) (2 points) water and hydrogen bonds chemical rea…
Question 1: The atoms within a molecule of water are held together by polar - covalent bonds. Question 2: Characteristics of a polar molecule (using water as an example): Uneven e…
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16. in art, contrast is used to: a. reduce the focus on the artwork b. …
C. Highlight differences between elements
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10. historical context in art helps us understand the ______________ be…
C. societal influences
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in art, contrast is used to: a. create a monochromatic scheme b. highli…
B. Highlight differences between elements
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what is the difference between a strong and weak base? select the best …
D. Strong bases are strong electrolytes and are completely ionized in solution. Weak bases are weak electrolytes and are only partially ionized in solution.
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question 1 how many signals would be present in the ¹hnmr?
A. 4
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what is the primary focus of contextual analysis in art? a. evaluating …
C. Understanding the historical and cultural background
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what is the difference between a strong and weak acid? select the best …
C. Strong acids are strong electrolytes and are completely ionized in solution. Weak acids are weak electrolytes and are only partially ionized in solution.
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1st attempt from the list below, identify all the strong acids. choose …
A. $HNO_3$ B. $HCl$ E. $H_2SO_4$ F. $HClO_4$
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14) a removing thermal energy from liquid water can cause it to change …
14) c) Solid 15) b) Product
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this is a numeric entry question / it is worth 1 point / you have unlim…
$2022.22$
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13) in which state of matter are molecules moving the fastest? a) gas b…
a) Gas
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what volume of 1.90 m srcl₂ is needed to prepare 525 ml of 5.00 mm srcl…
$1.38$
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3. stem a chemical reaction is endothermic if it absorbs heat from its …
The temperature of the solution decreased by 10°F. The reaction is endothermic because it absorbed heat from the surroundings causing the temperature of the solution to drop. ### …
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the concentration of pb²⁺ in a commercially available standard solution…
$0.030$
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18 chemical bonds encounter the phenomenon write the encounter the phen…
No specific answer is provided in the question - it's a prompt to explore knowledge, questions and learnings about how chemical bonds influence material properties.
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analysis questions 1. image 2 shows the recipe for a sandwich made with…
12
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analysis questions 1. image 2 shows the recipe for a sandwich made with…
$2B+M + C ightarrow BMC$
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the noble - gas notation for tin (sn) will contain the symbol ar. kr. x…
[Kr].
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it is easier to determine the electron configurations for the p - block…
their electrons are assigned to s and p orbitals only.
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which is the electron configuration for nobelium (no)? rn7s²5f¹⁴ rn7s²5…
[Rn]7s²5f¹⁴
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which of the following elements has the fewest valence electrons? ○ ber…
lithium
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part a what is the difference between a mixture and a compound? a mixtu…
A. A mixture is formed when two or more pure substances are mixed together, but a new substance is not formed. A compound is formed when two or more elements are bonded together i…
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part a what is an element? a compound? compound cannot be broken down i…
The second option: Element cannot be broken down into two or more simpler substances. Compound is made up of two or more elements in a fixed ratio and can be broken down into simp…
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what is an element? a compound? compound cannot be broken down into two…
The correct statement is: Element cannot be broken down into two or more simpler substances. Compound is made up of two or more elements in a fixed ratio and can be broken down in…
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part a what is a pure substance? a pure substance is composed of only o…
A. A pure substance is composed of only one type of atom or one type of molecule
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which of these elements has an electron configuration of kr5s²? ○ bariu…
strontium
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part a what is the difference between a homogeneous - mixture and a het…
A. A heterogeneous mixture has two or more distinct regions that have different compositions. A homogeneous mixture has only one region and the composition of the mixture does not…
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in which block of the periodic table is uranium (u) found? ○ s block ○ …
f block
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how would you classify raisin bran? pure substance - compound mixture -…
mixture - heterogeneous
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part a how would you classify salt water? pure substance - compound mix…
D. mixture - homogeneous
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part a which of the following is a homogeneous mixture? molten iron wat…
D. stainless steel
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part a which of the following is a heterogeneous mixture? vinegar sugar…
D. raisin bran
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part a which of the following items is a mixture? helium brass water su…
B. brass
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the difference between the second and the third ionization energies of …
d. 1,910 kJ/mol
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life as we know it could not exist without chemical reactions. for exam…
Cellular respiration, where glucose reacts with oxygen to produce carbon dioxide, water, and energy.
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the passage below describes a process of scientific inquiry. select the…
Janet could not recall ever seeing rusted aluminum objects, and she reasoned that aluminum must be less susceptible to corrosion than other metals, like iron.
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question 4 (mandatory) (2 points) when atoms share electrons unequally,…
Question 4: d) Polar covalent Question 5: e) Ionic bond
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question 2 (mandatory) (2 points) the nucleus of an atom contains______…
Question 2: d) protons and neutrons Question 3: a) Ion
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answer the following questions. these important terms help you to under…
1. It is defined as anything that occupies space and has mass - Matter 2. This is the smallest unit of matter that still retains all of the properties of that type of matter - Ato…
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question 30 1 point we watched as ___ schemes of the high - minded idea…
Question 30: utopian Question 31: utopian
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question 28 (1 point) the ______ scheme of the crook involved contactin…
Question 28 Blank 1: nefarious Question 29 Blank 1: verdant
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instructions read the question carefully and select the best answer. wh…
A. The ocean makes him feel isolated from everything and everyone he knows.
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the passage below describes a process of scientific inquiry. select the…
She found that the cups of sugar solution had the most ice in them and the cups of CaCl₂ solution had the least. She decided that she was correct in predicting that substances tha…
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multiple choice question a beam of light can remove electrons from cert…
D. Photoelectric effect
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6. does the effervescent tablet package tell the truth about the amount…
It depends on the comparison between the package - stated amount and the experimentally - determined amount of sodium bicarbonate. If the experimental value is within an acceptabl…
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the passage below describes a process of scientific inquiry. select the…
She concluded that mineral spirits are the best cleaner for oil paints since they are both nonpolar.
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mass of vinegar and cup (g) 484.81 g mass of tablet (g) 3.22g mass of v…
$1.56\%$
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1. complete table 2 by recording the data from the experiment in the vi…
The mass of $NaHCO_3$ in the tablet is approximately $1.89\ g$, and the percent error is approximately $1.56\%$.
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the passage below describes a process of scientific inquiry. select the…
He found that plain water took the most drops to spill off, while the water with three drops of detergent took the least. He determined that he was correct in predicting that dete…
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fill in the blank question the removal of electrons from certain molecu…
photoelectric
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2. how many grams of nh₃ are produced when 89.1 grams of n₂ gas react a…
972.74 g
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the passage below describes a process of scientific inquiry. select the…
Emma realized that water must be unusual, and that most liquids must get denser when they freeze.
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02 question (2 points) 1st attempt part 1 (1 point) the percent composi…
Empirical formula: $CH_{2}O$ Molecular formula: $C_{4}H_{8}O_{4}$
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prepwork part 1: electron configuration practice complete the ground - …
Magnesium: Orbital diagram: 1s (2 paired electrons), 2s (2 paired electrons), 2p (3 pairs), 3s (2 paired electrons); Electron configuration: 1s²2s²2p⁶3s² Chlorine: Orbital diagram…
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name: _ q1 chemistry: u2l11 electron configuration day 1 date: _ prepwo…
Magnesium: Electron configuration: 1s²2s²2p⁶3s²; Orbital diagram: 1s: ↑↓, 2s: ↑↓, 2p: ↑↓ ↑↓ ↑↓, 3s: ↑↓ Chlorine: Electron configuration: 1s²2s²2p⁶3s²3p⁵; Orbital diagram: 1s: ↑↓, …
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part 1 (3 points) chromium is most commonly mined in the form of chromi…
%Fe = 24.95% %Cr = 46.46% %O = 28.59% Part 2: C. 82.28 g
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the passage below describes a process of scientific inquiry. select the…
Scott set up 12 glass jars with a stick and hot water. He added white sugar to 6 jars and pure cane sugar to the other 6. After one week, Scott measured the size of the sugar crys…
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jacob likes to drink hot tea, and his friend likes to drink cold tea. j…
B. Does white sugar dissolve more quickly in warm water or in cold water? D. Does white sugar dissolve in warm water more quickly than brown sugar does?
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q1 chemistry: u2l14 electron config day 4 mad minute structure of the p…
1. Group 5A/15 2. Alkali Metals 3. Noble Gases 4. Group 3A/13 5. Halogens
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write the full electron configuration and draw the orbital notation for…
1. Boron electron configuration: $1s^{2}2s^{2}2p^{1}$; Orbital notation: 1s (↑↓), 2s (↑↓), 2p (↑) 2. Helium electron configuration: $1s^{2}$; Orbital notation: 1s (↑↓) 3. Sulfur e…
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the atom and atomic theory test study guide 1) explain in detail the ac…
16. $\approx3.075\times 10^{14}\text{Hz}$ 17. $\approx0.356\text{m}$ 18. $\approx6.0\times 10^{14}\text{Hz}$ 19. $\approx6.99\times 10^{-4}\text{m}$
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nova video questions: hunting the elements physical science - coach bar…
14) Sodium has one valence electron and readily donates it to achieve stability. 15) Chlorine accepts sodium's valence electron; sodium chloride is produced. 16) Oxidation reactio…
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19. sodium and chlorine reacting and changing into salt is an example o…
20. B. physical change 19. A. chemical change
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nova video questions: hunting the elements physical science - coach bar…
1. The number of protons in its nucleus. 2. Usually a few grams. 3. Around 12.4 kilograms; worth depends on market - price of gold. 4. Good conductor of electricity and heat, mall…
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→ focus questions: 1. how did industrialization affect the environment?…
1. Industrialization led to increased pollution through the release of large amounts of waste, such as chemical pollutants from factories and smoke from burning fossil fuels for e…
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4. how does the ion exchange system affect water? (a) it removes any io…
B. It takes out dangerous metals and fertilizer by replacing some harmful ions with better ones.
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which of the following compounds is a weak electrolyte? hno₃ nano₃ hno₂…
C. $HNO_2$
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which of the following is the correct net ionic equation for the reacti…
$Pb^{2+}(aq)+2Cl^{-}(aq) ightarrow PbCl_2(s)$
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identify the major ionic species present in an aqueous solution of na2c…
$Na^+, CO_3^{2 - }$ (the last option)
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2. read the following paragraph from the introduction paragraphs 1 - 5.…
C. Reverse osmosis is more efficient than other water treatments, but it is often unaffordable.
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analyzing poetry having read chapter 2 of the great gatsby, read the po…
1. Analyze the rhyme scheme (ABAB) and how it impacts the poem's tone and meaning. Look for figurative language like the contrast between the idealized view of Richard Cory and hi…
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which of the following compounds is a strong electrolyte? h₂o ch₃oh ch₃…
NaF
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question 6 (1 point) listen which of the following compounds is a nonel…
C. $C_2H_6O$ (ethanol)
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1. read the following statement. one part of the water treatment proces…
D. The cleaner water atop it then moves through membranes. Like a sieve, they filter out smaller contaminants (3).
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below is an image of electrolytes. match/label the correct type: nonele…
1. A. Strong electrolyte 2. B. Weak electrolyte 3. C. Nonelectrolyte
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based on the solubility rules, which of the following will occur if sol…
$BaSO_4$ will precipitate; $Cu^{2+}$ and $Cl^-$ are spectator ions.
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based on the solubility rules, which one of the following compounds sho…
$\text{CaCO}_3$
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based on the solubility rules, which one of the following should be sol…
$\text{K}_2\text{SO}_4$
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based on the solubility rules, which one of the following should be sol…
AgNO₃
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how did the work of dmitri mendeleev differ from that of john newlands …
B. Mendeleev predicted elements that would later be discovered.
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element name of element valence electrons e - gained or lost to form oc…
| Element | Name of element | Valence electrons | e - gained or lost to form octet (8 VE) | Symbol of ion | Anion or cation | | ---- | ---- | ---- | ---- | ---- | ---- | | O | Oxy…
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combining sentences level 1 prompt follow the instructions below to wri…
The changing of marshmallows while they cook is a chemical reaction.
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properties of matter test - do not write on this test handout. 1. the s…
1. B. matter 2. B. weight 3. B. B 4. C. Physical properties can be observed without changing the identity of a substance. 5. C. luster 6. D. wooden spoon 7. C. solubility 8. B. A …
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12. in which energy level are the outermost electrons of iodine? 13. wh…
12. 5th energy level 13. Left - hand side and middle (transition metals) of the periodic table 14. Right - hand side of the periodic table 15. Noble gases (Group 18); they have a …
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31) the volume of one mole of an ideal gas, at 2.0 atmospheres and 273 …
B. 11.2 L
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30) there are 2.0 moles of hydrogen, 3.0 moles of nitrogen and 5.0 mole…
B. 10.0 atm
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26) a 300 - milliliter container that is filled with 100 milliliters of…
D. 50 kPa