Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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classify each chemical reaction: ca(s) + cl₂(g) → cacl₂(s) fecl₂(aq) + …
1. \(Ca(s)+Cl_{2}(g)\to CaCl_{2}(s)\): combination 2. \(FeCl_{2}(aq)+BaS(aq)\to BaCl_{2}(aq)+FeS(s)\): double displacement (metathesis) 3. \(2H_{2}O_{2}(l)\to 2H_{2}O(l)+O_{2}(g)\…
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*identify if the following are physical (p) or chemical (c) characteris…
1. C 2. P 3. C 4. P 5. P 6. P 7. C 8. C 9. P 10. P
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by what means is this object attainable? evidently by one of two only. …
- What form of government does Madison describe? A pure democracy. - What will the majority faction normally do in this form of government? Sacrifice the weaker party or an obnoxi…
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9. classify these as an element, compound, homogeneous solution or hete…
a. Heterogeneous mixture b. Compound c. Homogeneous solution d. Compound e. Element f. Heterogeneous mixture g. Element
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8. use the data below to answer the questions. mass of empty crucible: …
a. The mass of the metal is $2.48\space g$. b. The mass of the oxygen that has combined with the metal is $0.67\space g$. c. The empirical formula for the metal oxide (if the meta…
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7. what is the molecular formula of nh₂ that has a molecular weight of …
\(N_2H_4\)
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6. a compound contains 75.95% c, 17.72% n, and 6.33% h. what is the emp…
\(C_{5}NH_{5}\)
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5. what is the molecular formula of a compound with a molecular weight …
\(C_6H_{12}\)
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in 1986, the worlds worst nuclear power plant accident occurred at cher…
Rainwater might have triggered another explosion - A crew built a concrete structure to seal the reactor. Erosion damaged the sarcophagus - The NSC was built. The explosion caused…
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4. what is the empirical formula for a compound containing 67.9% c, 5.7…
The empirical formula of the compound is \(C_{3}H_{3}N\)
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a student is writing a biography of mae jemison, the first african amer…
- "In 1992, Jamison spent eight days in space aboard the Endeavour with six other crew members." → Space Flight - "Jamison earned a bachelor of science degree in chemical engineer…
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2. a molecule has an empirical formula of ch₂o and a molecular weight o…
\(C_{6}H_{12}O_{6}\)
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extra practice 1. a compound contains 12 grams sulfur and 18 grams oxyg…
\(SO_{3}\)
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the owner of an organic pet food store would like to analyze the sales …
15%
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3. the molecule borazine has an empirical formula of bh₃n. what is the …
\(B_3H_9N_3\)
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why is it dark in the deep ocean?
Sunlight cannot penetrate to great depths in the ocean. As light travels through water, it is absorbed and scattered by water molecules, suspended particles, and dissolved substan…
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3. the molecule borazine has an empirical formula of bh₃n. what is the …
a. The mass of the metal is $2.31\space g$. b. The mass of oxygen combined with the metal is $2.59\space g$. c. The empirical formula for the metal oxide (if the metal is lithium)…
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a bakery has developed a new artisan bread. the staff are giving away t…
Measure sales of the new bread after customers have sampled it, Observe customer reactions while they taste the product.
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verify your calculation did you report your data to the correct number …
\(0.317\space M\)
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1. what is the empirical formula of a compound that is 64.8% c, 13.62% …
The empirical formula is \(C_{4}H_{10}O\) ### 2. a. Find the empirical formula for the compound that contains \(42.05g\) of nitrogen and \(95.95g\) of oxygen
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color by number counting atoms name: date: 10-27-23 per: 2nd key vocabu…
1. \(H = 2\), \(S = 1\), \(O = 4\), total \(7\) (red). 2. \(C = 1\), \(H = 4\), \(O = 1\), total \(6\) (orange). 3. \(Na = 1\), \(H = 2\), \(P = 1\), \(O = 4\), total \(8\) (yello…
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3. a student following the procedure of this experiment obtained the fo…
\(368.15\)
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volatile liquid: mass of flask, boiling stone, foil cap, and unknown af…
\(0.713\space g\)
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color by number counting atoms name: date: per: key vocabulary 1. a sub…
1. \(H = 2\), \(S = 1\), \(O = 4\) 2. \(C = 1\), \(H = 4\), \(O = 1\) 3. \(Na = 1\), \(H = 2\), \(P = 1\), \(O = 4\) 4. \(N = 1\), \(H = 4\), \(Cl = 1\) 5. \(Al = 1\), \(O = 3\), …
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(b) why should you not allow water to contact the foil cap while you ar…
Water on the foil cap would add extra mass, leading to inaccurate results in experiments where the mass of the condensed vapor (e.g., for molar - mass - related calculations) is m…
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disinfectant tips & safety true or false 30. for the following statemen…
37. B. disinfecting 38. C. large enough to contain all items to be disinfected and covered 39. A. logbook
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counting atoms key vocabulary 1. a subscript = a number that is written…
1. \(H = 2\), \(S = 1\), \(O = 4\), total \(7\) (red) 2. \(C = 1\), \(H = 4\), \(O = 1\), total \(6\) (orange) 3. \(Na = 1\), \(H = 2\), \(P = 1\), \(O = 4\), total \(8\) (yellow)…
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kingston james hace 3 meses ¿por qué hay dos isótopos diferentes para u…
Los isótopos de un elemento tienen el mismo número de protones pero diferente número de neutrones.
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entiendo que la cantidad de protones en un átomo define a qué elemento …
Los protones alteran drásticamente los átomos porque la cantidad de protones determina el número atómico del elemento. Un cambio en la cantidad de protones (por ejemplo, en reacci…
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¿cómo sabemos qué elementos tienen isótopos? ¿y cómo conocemos sus isót…
Para determinar si un elemento tiene isótopos, se estudia su composición nuclear. La tabla periódica no muestra isótopos específicos, pero la masa atómica es una media de los isót…
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answer each question. please note: you can answer each question only on…
Kinetic to heat energy.
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a group of students wanted to investigate what happens to a solution as…
B. controlled
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3. a scientist puts a material in a container. the material takes the s…
3. liquid or gas 4. They keep their volume but can change shape.
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she walks in beauty george gordon byron she walks in beauty, like the n…
B. The rhyme scheme is ABABAB.
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identify the names of the state changes depicted in the diagram. tap th…
1. Sublimation 2. Deposition 3. Melting 4. Freezing 5. Evaporation (or vaporization) 6. Condensation
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instrucciones: elige una respuesta y pulsa \siguiente\. recibirás tu pu…
una sustancia pura que no se puede descomponer mediante métodos químicos en componentes más simples
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consider a hypothetical chemical reaction: a + b → c + d (in this equat…
-50 kJ/mol, Exothermic, Yes, it's 100 kJ/mol, Yes, it's 150 kJ/mol
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what kinds of substances can leaching carry downward through the soil? …
nutrients, pesticides, and potentially harmful chemicals
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this painting is by pablo picasso, entitled the blind mans meal. what t…
B. He used a monochromatic color scheme, which occurs when one color predominates, shades of black, tints of white, values of a hue.
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determine if the following salt is neutral, acidic or basic. if acidic …
Acidic, \(NH_4^+(aq)+H_2O(l) ightleftharpoons NH_3(aq)+H_3O^+(aq)\)
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1. what is true about wind? (1 point) wind cannot cause things to move.…
1. None of the options are correct. But if we assume there was a typo and we are to pick the least wrong: - Wind cannot be still (as wind is air in motion). The option “Wind can b…
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the process of frying food changes its quality, texture, and color. sup…
\(433.56\)
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why dont the elements in group 4 gain or lose electrons? both of these …
Both of these reasons
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what is the difference between a bromine atom and a bromine ion? a brom…
A bromine atom has 35 electrons, while a bromine ion has 36 electrons.
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atomic number the smallest unit of an element that maintains the chemic…
La masa atómica es una unidad de masa que describe la masa de un átomo o molécula (exactamente \(1/12\) de la masa de un átomo de carbono con número de masa 12), mientras que el n…
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type the correct coefficient for each reactant and product. 1) balance …
1. \(3\ NaOH(aq)+1\ FeCl_3(aq)\to1\ Fe(OH)_3(s)+3\ NaCl(aq)\) 2. \(1\ NaCl(aq)+1\ AgNO_3(aq)\to1\ AgCl(s)+1\ NaNO_3(aq)\) 3. \(1\ Na_2CO_3(aq)+1\ Ni(NO_3)_2(aq)\to2\ NaNO_3(aq)+1\…
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with advancing age, the cross - links that hold collagen molecules toge…
skin
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in a wood biomass power plant, wood waste is burned. the resulting ener…
C. Chemical to thermal
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what is the difference between a bromine atom and a bromine ion? a brom…
A bromine atom has 35 electrons, while a bromine ion has 36 electrons.
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which represents the ion formed when sulfur achieves a full valence she…
B. \(S^{2 -}\)
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question 5 the epidermis: a protects the skin against mechanical injury…
C. all of the above
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when an atom loses an electron, it becomes... positively charged. a dif…
positively charged.
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when an atom gains an electron it becomes... an atom with a heavier mas…
negatively charged.
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a well - trained dish washer recorded the temperatures on the dish mach…
C. Call the service technician to check the accuracy of the thermometer
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add or subtract a positive integer on a number line 1. ms. howard buys …
Ms. Howard has spent $750$ on the car so far. # 2. ## Step1: Calculate the total number of screws after receiving the shipment The initial inventory is \(60000\) screws, and they …
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the following diagram represents a chemical reaction (the reaction syst…
- less - exothermic - to; warmer
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24) how many grams of aluminum oxide are produced according to the reac…
D. 7.25
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19) what is the theoretical yield of waffles if you have 5 cups of flou…
A. 10
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19) what is the theoretical yield of waffles if you have 5 cups of flou…
A. 10 20)
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isoborneol melts at 208 °c. why is the melting point of camphor lower (…
Camphor has weaker intermolecular forces (van - der - Waals) compared to isoborneol (which has hydrogen - bonding due to - OH group), so its melting point is lower.
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what type of alcohol is isoborneol? monoterpenoid alcohol what type of …
Isoborneol has hydrogen bonding (due to -OH group) which is stronger than the dipole - dipole forces (due to C = O group) in camphor. Stronger intermolecular forces (hydrogen bond…
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what type of alcohol is isoborneol? monoterpenoid alcohol what type of …
Camphor has a lower melting point than isoborneol because isoborneol can form hydrogen bonds (stronger intermolecular forces) due to its -OH group, while camphor has only dipole -…
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question 4 of 10 what did émile durkheim mean when he wrote about organ…
D. People are dependent on one another.
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multiple choice. choose the one alternative that best completes the sta…
13) E. none of the above 14) A. 16 15) C. 4.4 16) A. 36 17) C. 71.0 18) B. 9.0 moles of \(O_{2}\) and produce 6.0 moles of \(Fe_{2}O_{3}\)
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true/false. write t if the statement is true and f if the statement is …
1) T 2) F 3) F 4) F 5) T 6) T 7) F 8) T 9) F 10) T 11) T 12) F
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9. would you use reaction 1 or reaction 2 if you were constructing a de…
Reaction 2. Because it is exothermic (releases heat), making the device warm.
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identifying how peer relationships affect well-being sergio had always …
Sergio may be experiencing negative peer pressure to try drugs; Sergio is avoiding friends and family who care for him; Sergio is engaging in risky behavior that could affect his …
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8. would you use reaction 1 or reaction 2 if you were constructing a de…
Reaction 2. Because in an endothermic reaction (which makes the device cold), heat is absorbed. Reaction 2 shows a decrease in temperature (system absorbs heat from surroundings l…
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c and endothermic graphs energy in chemical reactions chemical reaction…
The reaction driving a fireworks display releases energy. This is because fireworks produce heat, light, and sound. These are all forms of energy being emitted (released) during t…
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a city gets its electricity from a dam, where water is stored in a rese…
Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanica…
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select all possible answers which of the following are examples of phys…
texture, color, smell, boiling point
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select all possible answers which of the following are examples of chem…
react with acid, flammability
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question 1 1 pts what is the best definition for matter? o anything tha…
anything that has mass and takes up space
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which metalloid has three valence electrons? boron arsenic silicon lith…
boron
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what are 1a, 3b, and 7a examples of on the periodic table? groups. numb…
groups.
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mrs. franklin loves teaching science and thinks about it all the time. …
ductility and malleability
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the design of a new computer processor requires that electric current b…
Metalloids are semiconductors.
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this is how zirconium appears in the periodic table. rounded to the nea…
\(40\)
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while looking at calcium (ca) on the periodic table, a student needs to…
directly to the right
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61. the abbreviation for at bedtime is: a: bid b: po c: h.s. d: p.m. 62…
61. C: h.s. 62. A: true 63. D: an injection of 20 mg of Valium immediately 64. A: gram 65. B: aseptic conditions 66. A: 3 ml in a 3 ml syringe 67. B: answer promptly, identify you…
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part a how many gold atoms does it contain? express your answer to thre…
\(6.26\times 10^{18}\)
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how can you efficiently determine the number of nails in a package? fir…
- Part A: First determine the mass of the package and then convert it to the number of nails using the mass of a single nail. - Part B: Since there can be hundreds and thousands o…
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part a how can you efficiently determine the number of nails in a packa…
First determine the mass of the package and then convert it to the number of nails using the mass of a single nail.
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part a how are the molar mass and empirical formula mass for a compound…
The molar mass is a whole - number multiple of the empirical formula mass.
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atoms of elements at the top of a group on the periodic table are small…
The valence electrons of the larger atoms are farther from the nucleus and are easier to remove, so the metals near the bottom are more reactive than those at the top.
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what is the empirical formula mass of a compound? it is the sum of the …
It is the sum of the masses of all atoms found in the simplest whole - number ratio of each atom type found in a compound.
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part a how are the empirical formula and the molecular formula of a com…
The molecular formula is a whole - number multiple of the empirical formula.
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part a why is chemical composition important? it provides an analysis o…
It provides an analysis of the amount of an element found within a compound.
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which metal in period 5 is very reactive and has two valence electrons …
strontium (Sr)
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while looking at xenon (xe) on the periodic table, a student needs to f…
directly up
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a sample of carbon contains ( 4.0 \times 10^{23} ) atoms. a sample of s…
The samples have the same number of atoms and, therefore, the same number of moles of atoms. Since silver has a greater molar mass, the silver sample has a greater mass.
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what mass in grams of nan₃ is required to produce 50.2 l of n₂ gas (den…
\(96.9\space g\)
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the elements in group 17 of the periodic table are all called halogens.…
number of valence electrons
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a student weighs out a 21.1 - g sample of aluminum and a 21.1 - g sampl…
The samples are of the same mass, but the metal with a larger molar mass is copper. For this reason, the aluminum sample contains more moles of metal and the aluminum sample conta…
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part a which statement is always true for samples of atomic elements, r…
If two samples of different elements contain the same number of atoms, they contain the same number of moles.
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what is the mathematical formula for computing mass percent composition…
mass % of element \( X=\frac{\text{mass of }X\text{ in one mole of compound}}{\text{mass of one mole of the compound}}\times100\% \)
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part a how many copper atoms are in a pure copper statue with a mass of…
\(1.56\times 10^{27}\space Cu\space atoms\)
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using potential and kinetic energy quick check which is the best descri…
All objects have potential energy stored in their chemical bonds and will have more potential energy when they are positioned above Earth’s surface.
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a leak in the air conditioning system of an older car releases 69 g of …
\(490\space g\)
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write the name of each of the following compounds. 1. nh4cl
Ammonium chloride