Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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note: to answer some of the questions, it may help to reference a perio…
A. gamma rays
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4. directions select the correct answer. the diagram below represents a…
The portion of the left - hand diagram with the cluster of red dots (inside the dotted square) represents the salt before mixing.
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88. everyone has a total calorie \budget\ than can be split into ____ a…
88. Essential, extra 89. True 90. Carbon
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to prevent chemical contamination, a food handler should use only appro…
False
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a food handler does not need to follow the manufacturer’s directions an…
False
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what do these two changes have in common? water evaporating from a lake…
A. Both are only physical changes. C. Both are caused by heating.
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the production and use of plastic bags has an environmental impact. the…
Plastic bags are a low - cost way to transport goods. The process of making ethylene from fossil fuels releases carbon dioxide into Earth's atmosphere. Plastic bags can be dangero…
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you notice that the drain in your kitchen sink is clogged, although you…
You predict that your sink became clogged because substances dissolved in the water reacted to form a solid.
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which of these changes is a chemical change? water freezing glass break…
food digesting
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when ethylene is made, it reacts with other ethylene monomers to make p…
- Polyethylene is made of carbon and hydrogen. - Many ethylene molecules are joined together to form polyethylene. - HDPE is made of long side - by - side chains of polyethylene.
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which of these properties is a physical property of a compound? o tende…
melting temperature
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to make polyethylene, its monomer ethylene must first be synthesized fr…
High temperatures are required to make ethylene. The synthesis of ethylene is a chemical change.
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using the isotopic notation shown below and the periodic table, identif…
Isotopic Name: Krypton - 86 Symbol: $^{86}_{36}Kr$
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which tool in a chemistry laboratory is used to measure mass? o balance…
balance
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food and beverage containers are commonly made of tin, steel, aluminum,…
density
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you are told that a coin is made from solid gold. what questions, when …
What is the color of the coin? Can you score the side of the coin easily? (Is the coin soft and malleable?) What is the density of the coin?
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62. phytochemicals are essential nutrients. true false 63. high sources…
62. False 63. Packaged Cookies
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ethanol is a common laboratory solvent and has a density of 0.789 g/ml.…
$108.882$
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an experimental procedure you are conducting asks you to measure 90 ml …
100 mL graduated cylinder
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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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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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# 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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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…