Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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explain how is the modern periodic table different from mendeleevs peri…
The modern periodic table is based on atomic number instead of atomic mass as in Mendeleev's table. It has a more accurate arrangement of elements considering their chemical prope…
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similar properties figure 2 at room temperature, chlorine is a gas, bro…
They have similar chemical properties and some related physical properties because they are in the same group (halogens) of the periodic table.
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Pb^{4+}$ | $CN^-$ | $Pb(CN)_4$ | lead(IV) cyanide | | $Na^+$ | $NO_2^-$ | $NaNO_2$ | sod…
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical Formula | Name of Compound | | ---- | ---- | ---- | ---- | | $Fe^{3 + }$ | $CrO_{4}^{2 - }$ | $Fe_{2}(CrO_{4})_{3}$ | iron(III) chromate | | $Fe^{3 + …
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question 8 river water held behind a dam is a form of ______. o chemica…
potential energy
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Co^{2+}$ | $NO_3^{-}$ | $Co(NO_3)_2$ | cobalt(II) nitrate | | $Cr^{2+}$ | $BrO_3^{-}$ | …
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match each job example with its career cluster. jake is a flight attend…
Jake (Flight Attendant) - Transportation and Logistics Deb (Video Game Designer) - Information Technology Israel (Cashier) - Marketing, Sales, and Service Arnie (Chemist) - Scienc…
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a penny has a mass of 2.50 g and the moon has a mass of 7.35×10²² kg. u…
$1.51\times 10^{24}\ g$ $4.87\times 10^{6}$
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how many valence electrons are in s²⁻?
8
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the drawing below shows a mixture of molecules: suppose the following c…
(1) Without seeing the actual drawing, we can't give a definite answer. But if we assume we counted and found more $S$ molecules, the answer for "Of which reactant are there the m…
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calculate the volume in milliliters of a 0.160m barium chlorate solutio…
938 mL
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a chemist must dilute 77.9 ml of 3.08 m aqueous sodium chloride (nacl) …
$0.120$
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there are two steps in the extraction of copper metal from chalcocite, …
$2Cu_2S(s)+3O_2(g)+2C(s) ightarrow4Cu(s)+2SO_2(g)+2CO(g)$
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write the electron configuration for a neutral atom of fluorine.
$1s^{2}2s^{2}2p^{5}$
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acetylene ($c_{2}h_{2}$) gas is often used in welding torches because o…
1.36 mol
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ammonium phosphate (nh₄)₃po₄ is an important ingredient in many fertili…
$20\ g$
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one - pager graphic organizer: reactivity and the periodic table. use t…
Box 1 - Definitions: - Reactivity: The tendency of an element to undergo a chemical reaction. - Valence Electrons: Electrons in the outermost shell of an atom involved in bonding.…
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what role do bacteria and fungi play in compost? (1 - 2 sentences) * yo…
What role do bacteria and fungi play in compost? They are decomposers that break down organic matter. How does composting help reduce human impact on the environment? It diverts w…
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air is the best way to clean the clutch housing when performing a clutc…
3. c. Both Technician A and Technician B 4. c. Both Technician A and Technician B 5. c. Both Technician A and Technician B 6. c. Both Technician A and Technician B 7. c. Both Tech…
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question 2 2.5 points save answer read the following scenario and answe…
very low oxygen levels and lack of plants to support animal consumers
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10) report the measurement below, in milliliters, to the correct number…
5.9 mL
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box 3: nonmetals reactivity trend draw an arrow showing: most reactive …
For non - metals in order of reactivity: 1. Fluorine (F), 2. Chlorine (Cl), 3. Bromine (Br) | Element | Group | Period | Reactivity (High/Low) | | ---- | ---- | ---- | ---- | | So…
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9) report the measurement below, in milliliters, to the correct number …
65 mL
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8) report the measurement below, in milliliters, to the correct number …
37.5 mL
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7 report the measurement below, in milliliters, to the correct number o…
6.78 mL
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6) report the measurement below, in milliliters, to the correct number …
84 mL
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5) report the measurement below, in milliliters, to the correct number …
7.50 mL
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4) report the measurement below in milliliters to the correct number of…
59 mL
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3) report the measurement below, in milliliters, to the correct number …
5.6 mL
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2) report the measurement below, in milliliters, to the correct number …
6.3 mL
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1) report the measurement below, in milliliters, to the correct number …
36.7 mL
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calculate the mass, in grams, of a single rubidium atom ($m_{rb}=85.468…
$1.429\times 10^{-22}$ g
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click to fix any capitalization errors below. click \submit answer\ if …
While studying for his Chemistry exam, Jackson Stewart stumbled upon the formula for a truth serum.
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click to fix any capitalization errors below. click \submit answer\ if …
While studying for his Chemistry exam, Jackson Stewart stumbled upon the formula for a truth serum.
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188.1 g au express your answer in moles to four significant figures
$0.9540\ mol$
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43.0 g al express your answer in moles to three significant figures.
$1.59\ mol$
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25. which type of chemical reaction tends to occur on its own, or spont…
25. Spontaneous reactions. 26. Activation energy. 27. Enzymes lower the activation energy of a chemical reaction.
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click to fix any capitalization errors below. click \submit answer\ if …
Bella Swan spilled Gatorade on her Chemistry 2 notes, so they smelled like fruit punch.
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balance the chemical equation below using the smallest possible whole n…
$1CH_4(g)+2O_2(g) ightarrow1CO_2(g)+2H_2O(g)$
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identifying types of data determine if the data are qualitative or quan…
1. Qualitative 2. Quantitative 3. Qualitative 4. Quantitative 5. Qualitative
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click to fix any capitalization errors below. click \submit answer\ if …
Before Kristoff can begin his chemistry lab, he has to put on his safety goggles.
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click to fix any capitalization errors below. click \submit answer\ if …
While sitting in his honors chemistry class, Olaf invented a new formula for grape soda.
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17. what is the relationship between monomers and a polymer?
Monomers are the individual units that combine to form a polymer.
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part a how much fluorine was formed? express your answer in grams to th…
$25.3$ g
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click to fix any capitalization errors below. click \submit answer\ if …
After the final exam, Maui's teacher hosts a bunsen burner hot dog roast for all chemistry students.
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10 numeric 10 points 1.50 g of nitrogen monoxide react with 2.00 g of o…
\(1.19\ g\)
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wintergreen oil is produced in the following scheme from 6.84g of ch₃oh…
32.5g
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click to fix any capitalization errors below. click \submit answer\ if …
Edward Cullen asked me to be his partner for the Chemistry 2 project.
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30.33g of cs₂ and 39.91g of o₂ are mixed within a kiln to produce sulfu…
1. D. 1.702g 2. A. 9.58g
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5 multiple choice 10 points determine the mass percent of c in sodium b…
14.28% ### 6.
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to produce zinc metal, carbon monoxide reacts with zinc (ii) oxide acco…
For the first question: 360.8g For the second question: 22mol
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click to fix any capitalization errors below. click \submit answer\ if …
There are no capitalization errors.
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click to fix any capitalization errors below. click \submit answer\ if …
Expecting a dull lecture, Pua was thrilled to do a hands - on experiment in honors chemistry.
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1 numeric 10 points magnesium metal reacts with nitrogen gas to form ma…
1 2
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dandruff is __________. a a viral infection of the scalp b caused by ov…
D. a fungal infection of the scalp
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10 numeric 10 points 1.50 g of nitrogen monoxide react with 2.00 g of o…
$1.19\ g$
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wintergreen oil is produced in the following scheme from 6.84g of ch₃oh…
1. D. 32.5g 2. B. 239.1g
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17. use electron dot diagrams to represent the sharing of electrons in …
(a) For $H_2O$: O is central, with two H atoms bonded to it. O has 2 lone pairs. (b) For $O_2$: Two O atoms with a double - bond between them and 2 lone pairs on each O. (c) For $…
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multiple choice 10 points calcium carbide (cac₂) is prepared as per the…
$0.636\ lb$
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multiple choice 10 points: determine the mass percent of sulfur in caso…
D. 23.56%
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20. unknown element z exists as a diatomic molecule. in the molecule, t…
(a) Non - metal (b) On the right side of the periodic table. Non - metals form covalent bonds and diatomic molecules to gain stability, and elements with such properties are typic…
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a compound contains 24.9g of iron (fe) and it weighs 80.0g. assuming th…
1. C. 179g/mol 2. B. 11.7g
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20. unknown element z exists as a diatomic molecule. in the molecule, t…
(a) Non - metal (b) Group 17 (halogens) of the periodic table. Non - metals with 7 valence electrons form single covalent bonds in diatomic molecules to complete their octet.
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1 numeric 10 points iron metal reacts with chlorine gas to form iron (i…
1
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determine the number of protons in an isotope with 15 neutrons and with…
34
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how many electrons are there in 10x+? take the number of neutrons to be…
2
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how many protons are there in the isotope represented herein: $_{31}^{5…
B. 31
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multiple choice 10 points an unknown compound is found to have the foll…
17.28
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5 multiple choice 10 points provide the chemical formula for sodium chl…
D. $NaClO_3$
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3 multiple choice 10 points supply the name for fe(oh)2 iron (i) hydrox…
3. B. iron (II) hydroxide 4. D. sodium oxide
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1 multiple choice 10 points supply the name for pcl5 phosphorus (i) chl…
1. C. phosphorus pentachloride 2. B. KCl
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matching 10 points match the following synonyms. atom solution molecule…
None of the provided options (4.50 L and 0.0116 L) are correct. The correct volume is approximately 29.0 L. For the matching part:
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vocabulary practice: fill in the blank use the vocabulary words above t…
1. sentient 2. alchemy 3. recoil 4. sinister 5. sanctuary 6. prophetic
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6 matching 10 points match the following with the correct form of matte…
- mirky water: heterogeneous mixture - brass: homogeneous mixture - iron: element - pure DI water: compound
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an american scientist reports the density of a metal to be 0.94000 $\fr…
1. C. 26,019 2. 5
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11. what property of water molecules allows water to dissolve many subs…
11. Polarity. 12. A solute is the dissolved substance, a solvent is the dissolving substance. Example: In salt - water solution, salt is the solute and water is the solvent.
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which three elements are found in every carbohydrate? oxygen hydrogen c…
Oxygen, Hydrogen, Carbon
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a tamoxifen study claims that a combination of chemotherapy and the hor…
1. the first group of 361 that received tamoxifen alone 2. not blind.
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which three elements are found in every lipid? some lipids contain addi…
carbon, hydrogen, oxygen
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complete the rhyme scheme. a b b c d d life has loveliness to sell, mus…
A, B, C, B, A, C
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the model shows the chemical structure of a molecule. this molecule is …
nucleic acid
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19 what is the role of peer review in scientific research? a to ensure …
19. A. To ensure that research findings hold up to scrutiny and were conducted ethically 20. D. Consult the Material Safety Data Sheet (MSDS) 21. D. Fabricating experimental resul…
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4. inorganic elements that cannot be synthesized by the body are called…
c. minerals
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which of these liquids would likely be alkaline in nature? vinegar milk…
None of the above
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6. how do the types of chemical bonds differ from each other? how are t…
Differences are in electron - transfer/sharing and atom types. Similarities are that they are forces holding atoms for stability.
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6. how do the types of chemical bonds differ from each other? how are t…
7. b. hydroxide ions 8. c. hydrogen bonds
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4) calculate the average atomic mass of the following: show all work!!!…
Boron average atomic mass: 10.9343 amu Sulfur average atomic mass: 32.047 amu Chlorine average atomic mass: 35.363 amu
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isotopes and average atomic mass 1) which of the following are not an i…
1) Can't answer without diagram details 2) Approximately 24.31 amu 3) Approximately 6.94 amu
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electronic configuration practice- use periodic table with electron con…
1. $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. $1s^{2}2s^{2}2p^{6}3s^{2}$ 3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$ 5. $1s^{2}2s^{2}2p^{6}3s^{2}3…
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use the phase diagram of substance x below to find the boiling point of…
(Actual value should be obtained by accurately reading the phase - diagram, here we just show the process. After reading the diagram accurately and doing the conversion, fill in t…
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select all the adjectives. dont include a, an, or the. lincoln loud cou…
chemist's
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a certain element consists of two stable isotopes. the first has an ato…
$63.55$ amu
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see if you can complete the following table using only what is on this …
| Element | Symbol | Atomic Number | Mass Number | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | Lithium | Li | 3 | 7 | 3 | 4 | 3 |
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name the following ionic compound. fe₃(po₄)₂
Iron(II) phosphate
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what is the name of the compound with the formula cucro4? what is the n…
1. NO 2. $Cu_{2}CO_{3}$ 3. Dioxygen difluoride 4. Copper(II) chromate
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use the phase diagram of substance x below to find the pressure at whic…
6 atm
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what is the charge of ions formed from atoms of mg? what is the charge …
Mg: + 2 Ca: + 2
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consider the ions fe²⁺ and o²⁻. how many protons and electrons does eac…
protons in Fe²⁺: 26 electrons in Fe²⁺: 24 protons in O²⁻: 8 electrons in O²⁻: 10
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use the phase diagram of substance x below to find the melting point of…
- 23°C
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the pressure above a pure sample of solid substance x at - 162. °c is r…
7 atm