Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what does the following symbol mean? click the view image button to get…
b) Health hazard
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what does the following symbol mean? click the view image button to get…
a) Toxic
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which symbol depicts an oxidizing reagent? click the view image button …
d) Option D
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10. caffeine... caffeine... choose the correct molecular formula for ca…
\( \boldsymbol{C_8H_{10}N_4O_2} \) (the first option, e.g., A. \( C_8H_{10}N_4O_2 \) if options are labeled A, B, C, D)
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in a lab experiment, students were tasked to collect exactly 50 ml of s…
The third set of equipment (safety goggles, graduated cylinder, bunsen burner, iron ring, iron stand, wire gauze, evaporating dish, filter paper, funnel, balance, beaker, beaker t…
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13. pollution originating from a single, identifiable source, such as a…
False ### Question 14
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lets find out how much you know about this topic! this will help us per…
Closed-toe shoes that cover the entire foot.
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measurement topic 2: final exam collecting and interpreting data ____ l…
To determine the relationship between particle size, temperature, stirring, and the time it takes for sugar to dissolve in water (or to investigate factors affecting the rate of s…
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a compound has an empirical formula of \\(\\ce{ch2o}\\) (molar mass 30 …
\( \text{C}_6\text{H}_{12}\text{O}_6 \) (assuming it's one of the options, e.g., the fourth option as per the image)
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the phosphorus cycle differs from the biogeochemical cycles in that it …
A. It does not have an atmospheric reservoir.
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1. what is the main cause of nutrient pollution in chesapeake bay? a. o…
c. Excess nitrogen and phosphorus from agricultural runoff ### Question 2
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5. __h₂o₂ → __h₂o + __o₂ 6. __al + __cl₂ → __alcl₃ 7. __ag₂o → __ag + _…
9. $\boldsymbol{1\text{Ca} + 2\text{H}_2\text{O} ightarrow 1\text{Ca(OH)}_2 + 1\text{H}_2}$ 10. $\boldsymbol{1\text{SeCl}_6 + 1\text{O}_2 ightarrow 1\text{SeO}_2 + 3\text{Cl}_2}$ …
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which of the following is a fact of isomers? although molecularly bonde…
The option (first option, likely worded as "Although molecular formula... same empirical formula and the same molecular formula") that states ethanol and dimethyl ether have the s…
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2.3: create simple mathematical models to represent chemical concepts. …
\( 0.1 \) Units: pounds ### 3B Solution:
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what is the atomic number of the atom? neon 10 protons, 10 electrons, 1…
B. 10 (assuming the blue option with 10 is the correct choice, formatted as per multiple - choice instruction: B. 10)
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there are 20 lines in the poem. the poem is numbered every 5 lines. fro…
## Part A: 2. Troubles will return, but summer lets the speaker forget them for a short time. ## Part B: 4. "And many a scheme did she devise To heal the hurt and soothe the wrong…
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3a. text partially obscured, likely a math/science problem answer: unit…
6 ### 3D:
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metals (elements on the left side of the periodic table) become anions …
B. Cations (assuming the options are A. Anions, B. Cations)
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fluorine, which has 7 valence electrons, is going to... give up 7 elect…
Gain 1 electron
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nh₄⁺ hydroxide silicon ammonium sodium
ammonium (the option with "ammonium" text, likely the green - colored option in the image)
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1.7 1.2.4 interpret simple examples of representing elements and compou…
- Number of protons: \(30\) - Number of electrons: \(30\) - Mass number: \(67\) - Number of neutrons: \(37\) ### Sub - question 2C (for the \(\text{Ca}_3(\text{PO}_4)_2\) part)
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18. choose the best answer. which of these forces/bonds is the stronges…
A. ionic bonding
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21. choose the best answer. which form of matter has the weakest interm…
21. gas 22. a covalent compound without hydrogen bonding 23. polar covalent bond
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which of these is a polyatomic ion?\ \\(\\text{co}_4^{+}\\)\ \\(\\text{…
1. $\text{CO}_3^{2-}$ 2. covalent 3. 5
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choose the best answers using the image. 12. use the image to choose th…
Q2: A. intramolecular force Q3: A. Label B Q4: C. intermolecular force
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subjects & predicates practice assignment name: date: class: directions…
1. **Complete split**: Jeff | pushed his sister Sally off the twisty slide. * Simple subject (circled): Jeff * Simple predicate (boxed): pushed 2. **Complete split**: Sally | bit …
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12. use the image to choose the best answer. label b is showing which f…
12. intramolecular force 13. label B
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10. use the periodic table to choose the best answer. what is the formu…
10. $\boldsymbol{P_3O_2}$ 11. $\boldsymbol{ionic\ bond}$
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8. choose the best answer using a periodic table. which of these compou…
8. a compound with triple bonds 9. metallic bond
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7.000 g of compound x with molecular formula \\(\\ce{c5h8}\\) are burne…
\( -1.4\times10^{2}\ kJ/mol \) (or -140 kJ/mol, but more accurately -1.4×10² kJ/mol)
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6. use the periodic table to choose the best answer. what is the name o…
6. copper (II) sulfide 7. $\text{Sr}_3\text{N}_2$
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4. use the periodic table to choose the best answer. what is the name o…
4. copper (I) nitride 5. calcium iodide
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2. use the periodic table to choose the best answer. what is the name o…
nitrogen tetrafluoride
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1. choose the best answer. the crystalline lattice structure of ____ co…
ionic
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which detail would be most important to include in a summary of the art…
(C) Alchemy included other subjects such as medicine, spiritualism, and art.
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the term route of entry on an sds refers to the way a ____ enters the b…
Chemical (the option corresponding to "Chemical")
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(b) robert boyle lived in the 1600s, and he believed that he changed go…
(A) Alchemy became more like modern chemistry with the work of Robert Boyle, who used the scientific method.
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a local reaction is when a chemical enters the bloodstream. true false
False
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read the section “roots in the ancient world.” which paragraph supports…
(A) But Jabir came up with something new. He believed that the key to the differences between metals was how much mercury and sulfur they contained. Making gold thus required the …
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chemical manufacturers must present which information on the products l…
D. All of the above
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a skull and crossbones pictogram indicates this kind of information abo…
C. Acute Toxicity
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8. match the molecular shapes with the lewis structures. options - trig…
1. $\text{CH}_4$ — tetrahedral 2. $\text{NH}_3$ — trigonal pyramidal 3. $\text{BCl}_3$ — trigonal planar 4. $\text{H}_2\text{O}$ — bent 5. $\text{CO}_2$ — linear
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use the references to access important values if needed for this questi…
\(39.606\) ### Second Calculation: \(\frac{9.21\times10^{4}}{9.40\times10^{-4}}\)
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1. choose the best answer using the periodic table. what is the formula…
○ $\text{N}_2\text{O}_3$
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1) choose the best answer using the periodic table. what is the name of…
1. magnesium phosphide 2. tetraphosphorus pentasulfide 3. $\text{K}_3\text{N}$
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choose the best answer. which of these represents an atoms tendency to …
○ octet rule
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8. choose the best answer based on the lewis structure. what is the cen…
1. oxygen 2. $SiO_2$
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which is the correct lewis structure for phosphorus trichloride (pcl₃)?…
The first option: $\underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{Cl}}}-\underset{\cdot \cdot}{\text{P}}-\underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{Cl}}}$ (with 3 lone…
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12 choose the best answer based on the lewis structure. how many lone p…
11. C. VSEPR Theory 12. 2
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worksheet 3: writing ionic compounds 1. write the chemical formula for …
a) $\text{NaCl}$ b) $\text{MgO}$
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worksheet 2: valence electrons and ion formation 1. how many valence el…
a) Na: 1 valence electron b) Mg: 2 valence electrons c) Al: 3 valence electrons d) Cl: 7 valence electrons e) O: 6 valence electrons
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b) it wears away rocks and soil from earths surface. c) it builds volca…
B. Wind, water, and temperature changes ### Question 7
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ionic bonding worksheets worksheet 1: introduction to ionic bonding nam…
### Worksheet 1: Introduction to Ionic Bonding 1. Ionic bonding is a chemical bond formed when electrons are transferred from a metal atom to a nonmetal atom, creating positively …
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5. choose the best answer. which of these is the correct lewis dot stru…
The first option (the leftmost structure with 7 dots around F: 3 pairs and 1 single dot)
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8. choose the best answer. what is the electron configuration for calci…
$\boldsymbol{1s^22s^22p^63s^23p^64s^2}$ (the third option)
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9. choose the best answer. what is the shorthand electron configuration…
9. [Xe] 6s²4f¹⁴5d¹⁰6p⁴ 10. 1s²2s²2p⁶3s²3p¹
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3. choose all that apply. which two sublevels does calcium have? d p s …
3. s, p 4. 4
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experiment & report 2 dimensional analysis chem 110 lab name (last) (fi…
$4.2\times10^{-6}\ L$ ### Problem 2: Convert 2.2 centimeters to millimeters
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1. choose the best answer. which element would be used for shorthand el…
1. [Ar] 2. 20
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francium is in period 7 and group 1 and has an atomic number of 87 and …
11. 1 12. 87 13. 7
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14. choose the best answer. which of these element groups always have t…
○ alkaline earth
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15. choose the best answer. which of these produce the most vibrant col…
15. alkali 16. transition
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18. choose the best answer. which of these element groups is the least …
1. group 2. transition
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19. choose the best answer. which of these element groups is most react…
19. A. alkali 20. 32
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part a: vocabulary (fill in the blank) 1. valence electrons are electro…
# Explicación: ## Parte A: Vocabulario (Rellenar los espacios) ## Paso 1: Definir electrones de valencia Los electrones de valencia se encuentran en el nivel de energía más extern…
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convert 136.71°f to kelvins. round your answer to the correct number of…
331.32
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question 2 (1 point) saved based on the graduated cylinder shown, what …
D) 5.7 mL
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11 fill in the blank 1 point balance the following chemical equation: t…
4, 5, 2
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9 fill in the blank 1 point balance the following chemical equation typ…
1, 3, 2, 3
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6 fill in the blank 1 point balance the following chemical equation: ty…
2 Na + 2 H₂O ---> 2 NaOH + 1 H₂
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a) cannot be determined b) 31.0 ml c) 18.0 ml d) 13.0 ml e) 1.03 g/ml f…
C) 18.0 mL
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4 multiple choice 1 point which of the following chemical equations is …
B. $2K + MgBr_2 ightarrow 2KBr + Mg$
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based on the graduated cylinder shown, what is the volume of the liquid…
D) 5.7 mL
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2 multiple choice 1 point which change is allowed when balancing a chem…
Changing coefficients in front of formulas
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question 1 (1 point) which one of the following substances will float i…
E. balsa wood (density = 0.16 g/mL)
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take a look at the periodic table square for zinc (zn): 5. what does th…
C. atomic number ### Question 6
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convert 522.1 k to degrees celsius. round your answer to the correct nu…
$249.0$
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types of reactions, balancing, and lcm quiz 1 fill in the blank 2 point…
2, 13, 10, 8
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convert 73.21°c to kelvins. round your answer to the correct number of …
346.4 (rounded to 4 significant figures, or 346.36 if strict precision is kept; the rounded value with correct sig figs is 346.4)
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4. which of the following is/are metalloid(s)? a. i and ii only b. i an…
A. I and II only
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3. (without a graphic organizer!) what is the percent by mass of oxygen…
Approximately 69.5%
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case english ii 50 yegor flew into a rage. \did you mean to make a fool…
A. Gerasim needs a job and asks the coachman Yegor for his assistance. ; E. Gerasim turns down the job Yegor helps him obtain after listening to the conversation between Polikarpy…
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part a what is the classification of a solution of naoh with a ph of 8.…
alkaline solution
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part a the ph scale ______. - is based on the salinity of a solution - …
is based on the concentration of hydrogen ions in a solution
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part a all salts are ionic compounds, but not all ionic compounds are s…
True
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molecular to empirical: for each of the following compounds, identify t…
2. Empirical Formula: $\text{N}_2\text{OH}_3$, Factor: 2 4. Empirical Formula: $\text{H}_6\text{O}_5$, Factor: 1 6. Empirical Formula: $\text{HP}_2$, Factor: 5
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which of the following is not a result of hydrogen bonds? view availabl…
Two hydrogen atoms join together to form a molecule of hydrogen gas.
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which of the following distinguishes hydrogen bonds from covalent bonds…
Only hydrogen bonds can form between molecules.
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multiple choice: identify the choice that best completes the statement …
1. d. Electrons are located outside a nucleus made of protons and neutrons. 2. b. 20 3. a. 20 4. b. 47 5. b. electrons 6. b. 75 neutrons 7. a. positive. 8. d. The mass of a neutro…
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question 4. the molar mass of zn(clo₄)₂ is ______. 164.84 g/mol. 260.55…
264.29 g/mol.
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question 3. the molar mass of a compound is expressed in .
grams per mole (or $\frac{\text{g}}{\text{mol}}$)
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question 2. which of the following represents the mass of one mole of w…
18.02 grams
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question 1. one mole of any substance contains particles, which is equa…
6.022 x 10²³
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directions: read the following poem, \grouped\ by ashley abrams. answer…
23. b. metaphor 24. b. frustrated to slightly hopeful 25. b. ABABCC 26. D. South Africa; Apartheid 27. A. The fact that he was the child of a black woman and a white man, which wa…
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12. which of the following best defines tone? a. the author’s attitude …
12. A. The author's attitude towards a subject 13. D. Third Person Omniscient 14. B. Second Person 15. A. First Person 16. B. Second Person 17. A. John was a kind and generous per…
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multiple-choice question nuclear energy is... energy stored in the bond…
B. use of nuclear reactions to produce electricity (suponiendo que la segunda opción sea la que dice esto, ya que la imagen muestra opciones y la correcta es la que refiere al uso…
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choose all that apply. chemical energy can be found in food burning woo…
- food - burning wood - photosynthesis
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multiple-choice question when a chemical reaction takes place, the stor…
released (la opción con el texto "released")
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multiple-choice question radiant energy is... energy that is transferre…
A. energy that is transferred by electromagnetic radiation, often referred to as light
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which of these uses logos? a. we are starving because the food, if you …
C. Yum Organics has been providing well-rounded organic lunches to schools on the West Coast for more than 15 years.