Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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a sample of metal has a mass of 15.90 g, and a volume of 4.32 ml. what …
$3.68$
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select the correct answer. which of these actions is an example of chem…
C. Oxygen in air reacts with iron content in rocks, causing them to change color.
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the production of concrete requires cement. almost all cement is made b…
Carbon dioxide is produced when calcium carbonate breaks down. Making quicklime is a chemical change.
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46. the list of foods that are included as peripheral foods are: jelly …
46. Jelly beans, ice cream, potato chips 47. False 48. True
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synthetic materials are made by applying chemical processes to natural …
- limestone - water - sand
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4.) an organic chemistry student is experimentally determining the melt…
85.6 °C
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elección múltiple 1 punto chicken soup is a ____. homogeneous mixture (…
# Breve Explicación: La sopa de pollo contiene diferentes componentes visibles como trozos de pollo, verduras, etc., lo que significa que no es uniforme en toda su masa. Unas mezc…
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2.) a chemistry student is experimentally determining the boiling point…
56.3 °C
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3. the atomic number of an element equals the number of: protons + neut…
C. Protons
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3.13 describe each property of the element fluorine as physical or chem…
a. Chemical property b. Physical property c. Physical property d. Chemical property e. Physical property
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jackson is taking a general chemistry course. he wants to make sure tha…
the answers to worked problems
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jackson is taking a general chemistry course. he wants to make sure tha…
the answers to worked problems
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toothpaste (na₂hpo₄) is a ____. compound homogeneous mixture (solution)…
# Breve explicación: El Na₂HPO₄ es formado por diferentes átomos (sodio, hidrógeno, fósforo y oxígeno) unidos químicamente en proporciones fijas, lo que lo convierte en un compues…
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elección múltiple 1 punto steam is a ____. element heterogeneous mixtur…
# Breve explicación: El vapor de agua (steam) es un compuesto formado por átomos de hidrógeno y oxígeno en una proporción fija (H₂O). No es un elemento, ya que está formado por má…
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fill in the missing words. write subscripts as regular numbers in order…
a) $NaOH$ b) $ZnSO_4$ c) $Ag_2CO_3$ d) $Al_2O_3$ e) $NiCl_2$
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elección múltiple 1 punto what is not a controlled variable reaction ve…
Form of the tablet (whole vs crushed)
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four students draw particle diagrams of how water particles change phas…
B.
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compound a has a mass of 7g and compound b has a mass of 5g. when they …
C. 12 g
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13. for the following pairs of molecules, draw their structures and at …
a. Structures can be drawn as described above and a hydrogen bond is possible. b. Structures can be drawn as described above and no hydrogen bond is possible. c. Structures can be…
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3.12 what type of change, physical or chemical, takes place in each of …
a. Physical change b. Chemical change c. Physical change d. Chemical change e. Physical change
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3.5 a dietitian includes one of the following mixtures in the lunch men…
a. Heterogeneous b. Homogeneous c. Heterogeneous d. Heterogeneous
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chapter 3 hw 3.1 classify each of the following pure substances as an e…
a. Element b. Compound c. Element d. Compound e. Compound
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12. answer the following questions using the diagram below: a. draw in …
a. Draw two dots between each bold - bonded pair of atoms to represent shared electrons. b. Mark $\delta+$ on hydrogen atoms and $\delta-$ on electronegative atoms (O and N) in th…
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23) washing produce under running water has been shown to be just as ef…
23. True 24. True
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question 3 (1 point) retake question consider the following ions and el…
Question 3: Sn$^{+2}$ and Sb$^{+3}$ Question 8: 2
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2. for each of the following, label as a metal, nonmetal, metalloid a. …
a. Nonmetal b. Metal c. Metal d. Nonmetal e. Metalloid f. Metalloid g. Metal h. Nonmetal i. Metal j. Metal k. Nonmetal l. Nonmetal
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10) all of the following are benefits of composting except: reduces the…
10. Inhibits the production of beneficial bacteria and fungi 11. False 12. True
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when lithium forms an ion, it will most likely gain 1 electron to becom…
lose 1 electron to become Li⁺
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when sulfur forms an ion, it will most likely lose 2 electrons to becom…
gain 2 electrons to become $S^{2 - }$
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fill in the missing words a) the compound with the formula $al(no_3)_3$…
a) Aluminum nitrate b) Potassium hydrogen carbonate c) Barium phosphate d) Cobalt(III) hydroxide e) Lead(IV) dioxide
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identifying the positives and negatives of organic farming sort each st…
Pros: Reduces chemical pollution, Promotes biodiversity, Often uses sustainable practices Cons: Can be more labor - intensive, Typically has lower yields, Often more expensive for…
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based on what you have read about suarez farms, what are the costs and …
1. Growing organic vegetables may limit the resources available for new farm equipment. 2. Growing organic vegetables is more expensive than traditional methods. 3. Growing organi…
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which portrays inadequate data? o geoff uses another classmates data be…
Geoff uses another classmate's data because he forgot to record his own experiment's temperature readings.
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identify whether each of the following statements is true regarding the…
1. F 2. T 3. F 4. F 5. F 6. F 7. T
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3. analyze: what do the elements in each column of the periodic table h…
Elements in each column have the same number of valence electrons and similar chemical properties.
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which pair of elements will form a metallic bond? magnesium (mg) & gall…
Magnesium (Mg) & gallium (Ga)
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which element will form a metallic bond with calcium (ca)? arsenic (as)…
B. iron (Fe)
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unit exam - ionic compounds and metals 7 n 14.01 12 mg 24.31 what is th…
100.95
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all carbohydrates are more soluble in nonpolar solvents than in water. …
have the general structure $(C_1H_2O_1)_n$ or $C_nH_{2n}O_n$
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8. for each of the molecules below, draw the compound using a lewis str…
For question 8: CH₄: Non - polar NH₃: Polar OH⁻: Polar For question 9a: Polar molecules: NH₃, OH⁻, methanol. Reason: Presence of lone pairs and electronegativity differences creat…
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unit exam - ionic compounds and metals 9 f 19.00 20 ca 40.08 what is th…
$78.08$
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unit exam - ionic compounds and metals which state of matter is conduct…
liquid
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cis - butene and trans - butene have the same functional groups but cis…
They are not the same shape.
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organic vegetables at a higher price. switching to organic farming may …
vegetables
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two ionic crystalline solids are melted and tested with a conductivity …
Conductivity
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what is the name for the ionic compound na3n? sodium nitrogen sodium ni…
sodium nitride
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what evidence do scientists have that earth has been hit by large objec…
- layer of burned organic matter - change in average global temperature - mass extinctions
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what is the name for the ionic compound lii? lithium iradium lithium io…
lithium iodide
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ionic compound formulas compound made from lithium and what is the form…
$Li_3P$
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ionic compound formulas an ionic compound made from calcium and chlorin…
$CaCl_{2}$
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6. explain your thinking. many chemical properties are determined by th…
Which element has similar properties to lithium? Sodium Beryllium? No Explain: Lithium is in Group 1 of the periodic table. Elements in the same group have the same number of vale…
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how many oxygen (o) atoms are in the particle? na₂co₃ 2 1 6 3
3
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unit exam - ionic compounds and metals which element will form an ionic…
sulfur, S
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which element will form an ionic bond with phosphorus, p? calcium, ca n…
Calcium, Ca
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what is the common ion charge for iodine, i?
- 1
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unit exam - ionic compounds and metals what is the common ion charge fo…
- 1
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which atom is likely to gain electrons to become an anion? magnesium, m…
chlorine, Cl
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2. analyze: electrons are arranged in orbits called energy levels. the …
A. 2 B. 8 C. 8 D. 1
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which atom is likely to lose electrons to become a cation? lithium, li …
Lithium, Li
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determine if the data are qualitative or quantitative. zinc is a silver…
Aluminum: Qualitative Nitrogen: Quantitative Gallium: Qualitative Chlorine: Quantitative Zinc: Qualitative
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analyze: an isotope is an alternative form of an element. each isotope …
A. 3 B. 13 C. 12 D. 10 E. 10
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analyze: an isotope is an alternative form of an element. each isotope …
A. Carbon - 12, Carbon - 13 B. Nitrogen - 14, Nitrogen - 15 C. Oxygen - 13, Oxygen - 15 D. 3 E. 13 F. 12 G. 10 H. 10
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when hydrogen bonds form between water molecules, water condenses evapo…
condenses
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23) according to the food label descriptor terms, food that is raw, has…
23. B. Fresh 24. B. Cholesterol
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unit exam - ionic compounds and metals if two atoms get too close, what…
They will repel each other.
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11) the us agency that is responsible for certifying organic foods is f…
Department of Agriculture ### 12)
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which of these is a change from a gas to a solid? deposition evaporatio…
Deposition
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# question 3 (10 pt). in a 6 - bit system, use two’s complement scheme,…
The binary representation of $7_{10}$ is 000111, the binary representation of $-7_{10}$ is 111001, the result of the binary addition is 000000, and the decimal validation shows th…
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element: radon lewis dot symbol of the atom valence electrons: rn lewis…
Valence Electrons of the Atom: 8; Lewis Dot Symbol of the Atom: 8 dots around 'Rn'; Valence Electrons of the Ion: 8; Lewis Dot Symbol of the Ion: 8 dots around 'Rn'
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true—false t f 20. hot glass looks the same as cold glass. f 21. all ch…
20. F 21. T 22. F 23. T 24. F 25. T 26. F 27. T 28. T 29. F 30. T 31. F
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3) the us department of agriculture has certified that organic foods ar…
3. B. False 4. B. False 5. D. Cereal
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post - lab questions show all work for the calculations below, and expr…
Volume of Metal Sample: $8.36\ cm^{3}$ (3 significant figures) Density of Metal Sample: $11.4\ g/cm^{3}$ The density would not change significantly when using a centigram balance.…
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8. pick up the end that looks cooler. c. use tongs. d. pour cold water …
10. C. tell the science instructor at once. 11. D. all of the above. 12. D. none of the above.
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what did president roosevelt do in 1906 that influenced the regulation …
He passed two laws: The Meat Inspection Act and The Food and Drugs act.
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station #8 21. fill in the following table. atom/ion atomic # p⁺ n⁰ e⁻ …
| Atom/Ion | Atomic # | $p^+$ | $n^0$ | $e^-$ | Charge | Atom, Cation, or Anion | |---|---|---|---|---|---|---| | $Li^+$ | $3$ | $3$ | $4$ | $2$ | $+1$ | Cation | | $N$ | $7$ | $7…
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19. name the element represented by the orbital diagram below. 20. name…
19. Argon (Ar) 20. Indium (In)
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which part of a molecule does sunlight excite? a neutron b proton c ele…
C. electron
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a. identifying an unknown metal transfer the densities calculated from …
a. The unknown metal's density is close to titanium ($4.51\ g/cm^{3}$) and zinc ($7.14\ g/cm^{3}$). b. Assuming it's titanium based on density comparison. c. Without a description…
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1. flammable materials, like alcohol, should never be dispensed or used…
1. B. an open flame. 2. A. notify your instructor. 3. D. any time chemicals, heat or glassware are used. 4. C. advise your science instructor that you wear contact lenses. 5. C. a…
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a) in a compound with the formula c6h14 there are atoms of carbon and a…
a) 6, 14 b) 2, 1, 4 c) 2, 4, 3 d) 3, 8, 3 e) 2, 3
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literary / text elements persuasive appeals directions: read the passag…
1. The Nobel Committee should ensure future Nobel - Prize winners reflect gender diversity due to the current lack of it. 2. Logos appeal, using statistics to support the claim. 3…
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question 5 which is the physical change? electrolysis of water cutting …
Cutting a piece of paper with scissors
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question 4 choose the chemical change from the following options flatte…
Generation of heat from the decomposition of methane
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question 4 arrange the following from lowest ionization energy to highe…
Ca, Br, Kr
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fill in the missing words a main group atom is the most stable when its…
1. valence 2. incomplete 3. share 4. lose
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question 3 choose the chemical from the following options folding cloth…
The browning of an exposed piece of apple
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question 2 choose the physical change slicing a watermelon burning a me…
Slicing a watermelon
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arrange the following by increasing atomic size. br, ca, kr
Kr, Br, Ca
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question 1 which of the following is a physical change? oxidation of ir…
Water boiling into water vapor
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# question 2 (10 pt). in a 6 - bit system, use sign/magnitude scheme, p…
The resulting sum is not zero in decimal. The binary representation of 7 is 000111, - 7 is 100111, their binary sum is 101110, and the decimal value of the sum is - 14.
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drag the tiles to the correct boxes to complete the pairs. not all tile…
A. sulfur dioxide B. condensation of chemicals in the atmosphere C. acid precipitation D. acidic water
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periodic table - scrambled sentences worksheet name: via zayas date: 9 …
1. Elements in the same group have the same number of outer electrons. 2. The atomic number is the number of protons in an atom. 3. Nonmetals are generally brittle and poor conduc…
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fill in the missing words a) bonds form between a metal and a nonmetal …
a) Ionic b) Ionic c) Covalent d) Covalent
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ionic compounds containing transition metals please complete the follow…
| Name of Ionic Compound | Formula of Ionic Compound | | ---- | ---- | | 1. Copper (II) sulfate | $CuSO_{4}$ | | 2. Copper (I) oxide | $Cu_{2}O$ | | 3. Chromium (III) cyanide | $C…
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dfsc 2316 : pre - quiz 50 points, due 11:59:59 pm, 09/14/2025 please su…
$101_2 = 5$ $01011_2=11$ $10111010_2 = 186$ $A2B_{16}=2603$ $123_8 = 83$ 7 in 6 - bit sign/magnitude: $000111$ - 7 in 6 - bit sign/magnitude: $100111$ Binary addition result: $101…
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an article reported on a long - term study of the effects of hurricanes…
$108.7$
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34. which of the following is a clue of a chemical change? a. iron chan…
34. c 35. d 36. d 37. c 38. b 39. d 40. a 41. a
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b. measurements for an unknown solution using a buret |solution # titra…
The percent difference between the densities of Trial #1 and Trial #2 is approximately $42.95\%$.
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revlon was founded in 1932 by charles revson, his brother joseph, and c…
1. Salon educator 2. Film/editorial nail technician 3. Medical nail technician (MNT)
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q.9. how many moles of k are there in 36.70 g of k? ans. given: 36.70 g…
0.9386 mol