Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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the pressure above a pure sample of solid substance x at -162. °c is ra…
(The answer depends on the actual reading from the phase - diagram. Since the diagram is not fully legible for precise value extraction, a specific numerical answer cannot be prov…
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2.1 the nature of matter 1. in the atom, which particles are in constan…
1. d. electrons 2. Sodium chloride has different properties than sodium and chlorine. Sodium is a reactive metal, chlorine is a toxic gas, while sodium chloride is a stable, edibl…
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draw the lewis dot diagram for a be²⁺ cation.
$Be^{2+}$
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draw the lewis dot diagram for a neutral atom of o.
Place the symbol 'O'. Then put 2 dots on the top, 2 dots on the bottom, 1 dot on the left, and 1 dot on the right of the 'O' symbol.
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study the following phase diagram of substance x. use this diagram to a…
Solid It will sublime (change from solid to gas) It will melt (change from solid to liquid)
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study the following phase diagram of substance x. use this diagram to a…
Liquid It will vaporize It will vaporize
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10. factors affecting rate of dissolution which of the following factor…
A. Surface area, C. Agitation, D. Temperature
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11. experiment on rate of dissolution students add salt to four beakers…
B. Agitation
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13. explanation of solubility and temperature which statement best expl…
A. Increased temperature raises kinetic energy, allowing more solute particles to dissolve.
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the boiling point of a substance is the temperature at which the substa…
krypton
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study the following phase diagram of substance x. use this diagram to a…
Liquid It will vaporize It will freeze
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look at the text below. if there is an error with subject - verb agreem…
The number of protons in an atom is expressed by that element's atomic number on the periodic table.
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study the following phase diagram of substance x. use this diagram to a…
1. Liquid 2. It will vaporize 3. It will freeze
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c. to dilute the solution, add more salt. d. to dilute the solution, ad…
D. To dilute the solution, add more water.
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who was the agricultural chemist who developed peanut farming as a stra…
George Washington Carver
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8. diluting a saltwater solution 12 g of nacl (salt) are dissolved into…
# Brief Explanations: Dilution[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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5. elements vs. compounds each of these options is either an element or…
5. A. A molecule with two oxygen atoms, B. An atom of Krypton, D. A molecule composed of one type of atom 6. A. Water is the solvent, and sugar is the solute. 7. A. 4 only 8. (Not…
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1. substance composition images a and b show two different substances. …
1. B. Images A and B are both molecules containing 2 atoms of oxygen., D. Image A is an element and image B is a compound. 2. B. The ice has melted, which is a physical change., C…
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1. substance composition images a and b show two different substances. …
1. B. Images A and B are both molecules containing 2 atoms of oxygen, D. Image A is an element and image B is a compound. 2. B. The ice has melted, which is a physical change, C. …
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question 28 an example of a catabolic process is o hydrolysis dehydrati…
Question 28: Hydrolysis Question 29: Alkaline (basic) Question 30: Helium
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question 25 1 pts an isotope of an element contains different numbers o…
Question 25: C. neutrons Question 26: B. stability of the atom when there are eight electrons in the outermost energy level. Question 27: A. hydrolysis
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study the following phase diagram of substance x. use this diagram to a…
1. Solid 2. Sublimation (change from solid to gas) 3. Melting (change from solid to liquid)
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question 22 1 pts atomic mass is determined by the number of: protons a…
Question 22: D. protons and neutrons Question 23: B. turn blue Question 24: C. synthesis
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question 19 1 pts the hydrogen isotope tritium consists of: one proton.…
Question 19: one proton and two neutrons. Question 20: Decomposition Question 21: all of the above.
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question 16 1 pts as the concentration of hydrogen ions (h+) increases,…
- Question 16: solution becomes more acidic. - Question 17: dehydration synthesis. - Question 18: All of the above
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question 13 1 pts ab + cd → ad + cb is an example of a(n) ____ reaction…
Question 13: B. exchange Question 14: A. electrons Question 15: D. all of the above
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select all that apply select all the statements that are true of the ph…
B. A medium such as air or water is necessary to conduct sound to our ears. C. Air molecules move in regular, wavelike patterns. D. It is created by a vibrating source.
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question 7 1 pts a magnesium atom has an atomic number of 12, an atomic…
12; 13; 10 ### Question 8
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question 4 1 pts an ionic bond is formed by: two or more positive ions …
Question 4: a positive and a negative ion attracting each other. Question 5: All of the above are true of acids. Question 6: protons.
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study the following phase diagram of substance x. use this diagram to a…
Solid Melts Remains solid
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study the following phase diagram of substance x. use this diagram to a…
Vaporize; Freeze
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study the following phase diagram of substance x. use this diagram to a…
Solid It will sublime It will melt
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a rock breaking in limestone due to groundwater slowly dissolving it ov…
a) Physical weathering
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fill in the blank question is the movement of air molecules brought abo…
Sound
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what were jim crow laws? laws guaranteeing civil rights of free black a…
1. C. laws enacted by southern states following Reconstruction that discriminated against Black Americans 2. A. de facto
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10. kim answered a help - wanted ad. the ad states that the job pays d …
$\frac{d}{6}$ ### 11.
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unlike clinical psychology, counseling psychology multiple choice invol…
C. focuses specifically on educational, social, and career adjustment problems.
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multiple choice question the movement of air molecules brought about by…
D. sound
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study the following phase diagram of substance x. use this diagram to a…
Solid; Sublimation; Remains solid
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sol snapshot - challenge yourself by answering the sol style questions …
1. b) Water freezing and expanding in rock cracks 2. c) Acid rain dissolving minerals in a rock
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11. give three examples of isotopes and their uses, not discussed in cl…
Carbon - 12 (used in radiocarbon dating, 6 protons, 6 neutrons, 6 electrons), Carbon - 14 (used in radiocarbon dating, 6 protons, 8 neutrons, 6 electrons), Uranium - 235 (used as …
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this exercise will lead you to verify that the average atomic mass of m…
\(2.499\) amu
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complete the table below. for example, in the first row decide whether …
| element | most likely ion | | | ---- | ---- | ---- | | | symbol of ion | type of ion | | scandium | $Sc^{3+}$ | cation | | strontium | $Sr^{2+}$ | cation | | iodine | $I^{-}$ | …
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a scientist makes an acid solution by adding drops of acid to 1.2 l of …
40 drops were added. About $0.17\%$ of the solution is acid.
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a scientist makes an acid solution by adding drops of acid to 1.2 l of …
40
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write the composition of one atom of the $^{42}ca$ isotope. 14 × proton…
20 protons, 22 neutrons, 20 electrons
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how do the data in the graph answer this question? proportion soil orga…
Amount of carbon in the soil was greatest near the intermediate trees, followed by the tallest, and then shortest trees.
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3. where does the matter from burning propane come from? when propane b…
1. F: Some water vapor and carbon dioxide comes from the person who burns the propane - False. The person is not the source of the elements in water vapor and carbon dioxide from …
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exercise summary of atomic composition how many electrons, protons, and…
Protons: 94 Neutrons: 146 Electrons: 94
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question: 9 of 10 point (yes or no) (yes or no) (yes or no) x 16 g 2 cm…
D. Lua, because all the samples have identical properties
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question 12 the element with the electron configuration 1s²2s²2p⁶ is a …
C. Ne
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date identifying chemical bonds identify each of the following as a com…
1. Elements: Hydrogen, Oxygen; Bond: Covalent 2. Elements: Carbon, Hydrogen; Bond: Covalent 3. Elements: Hydrogen, Chlorine; Bond: Covalent 4. Elements: Phosphorus, Oxygen; Bond: …
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question 11 at most, how many electrons can occupy the second shell? a …
C. 8
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the study of gas behavior helped establish early chemistry as a legitim…
TRUE
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test content page 10 of 25 question 10 which of the following can be cl…
B. baking soda (sodium bicarbonate)
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the primary goal of the earliest chemists was to gain an understanding …
# Breve explicación: Los primeros químicos se dedicaban a estudiar los materiales y los cambios que estos experimentaban con el objetivo de comprender cómo funcionaba el mundo. # …
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question 8 which of the following best describes saltwater (nacl in h2o…
B. Saltwater is a mixture whose particles can be physically separated.
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test content page 7 of 25 question 7 calcium is an example of a(an) ___…
B. alkaline earth
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question 8 which element is most likely to have chemical properties sim…
C. Be (atomic number 4)
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what subatomic particle explains the periodicity of elements? neutrons …
# Breve explicación: La periodicidad de los elementos en la tabla periódica se debe a la estructura electrónica de los átomos. Los electrones se organizan en capas y sub - capas, …
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page 4 of 25 question 4 the symbol of the element with 46 protons is a …
D. Pd
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name & #: devin b. 3 name the following compounds: 1) n₂o₅ 2) sebr₆ 3) …
1. Dinitrogen pentoxide 2. Selenium hexabromide 3. Methane 4. Benzene 5. Phosphorus hexafluoride 6. Boron trifluoride 7. Diphosphorus tetraiodide 8. Disulfur trichloride 9. Nitrog…
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question 2 in a neutral atom, the number of protons must equal the numb…
B. False
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name the following compounds: 1) n₂o₅ 2) sebr₅ 3) ch₄ 4) c₆h₆ 5) pf₅ 6)…
# Explanation: ## Step1: Name $N_2O_5$ It is a covalent compound. The prefix for 2 is "di -" and for 5 is "penta -". The first element is nitrogen and the second is oxygen (ending…
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which statement among a - c is false regarding the redox reactions show…
None of the above statements are false.
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test content page 1 of 25 question 1 xenon is an example of a(an) _____…
B. noble gas
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what type of ion do alkali metals form? negative ion/anion molecule pos…
positivo ion/cation
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what type of metals are found on the leftmost side of the periodic tabl…
# Breve explicación: Los metales alcalinos se encuentran en el lado más izquierdo de la tabla periódica. Son los elementos del grupo 1 (excepto el hidrógeno). Los halógenos son no…
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how many elements did characteristics repeat every in the early list of…
eight elements
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which statement among a - c is false regarding the redox reactions show…
None are false; all are true statements.
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which statement among a - c is false regarding the redox reactions show…
None are false; all are true statements.
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how many elements were in the periods for the first two rows of mendele…
B. ten
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what characteristic of elements did mendeleev realize was more importan…
# Breve explicación: Mendeleev descubrió que la reactividad química era un factor crucial para ordenar los elementos en la tabla periódica, y fue más importante que el peso atómic…
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multiple - choice question what element is not found in carbohydrates? …
B. Nitrogen
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an individual was exposed to a contagious disease but did not become in…
B. physical barrier
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chapter 4 - chemistry conversions test review show your work! make sure…
1. 249680 inches 2. 15144 hours 3. 764.785625 miles/h 4. 91.25 cases/year
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select the correct answer. a molecule of carbon moves through various m…
B. air
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select the correct answer. how does the carbon locked in shells of mari…
A. through subduction of deposits and volcanism
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astronomers can determine the chemical composition of stars by observin…
Wavelengths of light emitted by the star.
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update 2024 on singapores green plan 2030 https://www.youtube.com/watch…
a. 53.465 million tonnes b. 47.175 million tonnes
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question 7 which one of these spills can be cleaned up by laboratory pe…
Small spills (less than 100 mls) that are contained to the biosafety cabinet or fumehood work surface
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6 combien y a - t - il de moles d’eau (h₂o) dans 1 l d’eau (1 000 g d’e…
$55.56\ mol$
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5. use the data in the table to calculate the density of each unknown s…
| Mass (g) | Volume (cm³) | Density (g/cm³) | Substance | | ---- | ---- | ---- | ---- | | 171 | 15 | 11.4 | | | 108 | 40 | 2.7 | | | 475 | 250 | 1.9 | | | 680 | 1000 | 0.68 | |
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name the following acids. 1 hcl 2 hno₃ 3 h₂so₄ 4 h₃po₄ 5 hf 6 hbr 7 h₂s…
Acids: 1. Hydrochloric acid 2. Nitric acid 3. Sulfuric acid 4. Phosphoric acid 5. Hydrofluoric acid 6. Hydrobromic acid 7. Sulfurous acid 8. Chloric acid 9. Phosphorous acid 10. C…
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name: surname: elements, compounds, and mixtures (worksheet) q.1. write…
Q1: 1. F 2. T 3. T 4. F Q2: a) element b) compound c) mixture d) heterogeneous mixture e) homogeneous mixture
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b) combien datomes y a - t - il dans 5,00 mol de soufre?
$3,011\times10^{24}$ atomes
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q.10. how many different atoms are there in the following molecule? a) …
Q.10: d) 8 Q.11: c) Soil Q.12: b) Lemonade
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q.6. which one of the following is an element? a) gold b) water c) pure…
Q.6: a) Gold Q.7: a) Pure Water Q.8: d) 24 Q.9: c) compound
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name: surname: q.5. which of the diagrams below represent a mixture?
b)
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4. based on the concept of periodic trends, answer the following questi…
4. a. Na b. Be c. Na 5. a. F b. F c. P 6. Group 18 7. a. the 4s electrons 8. Silicon (Si) 9. d. occupied principal energy levels 10. a. decreases and the atomic radius increases
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shown is a set of problems in a chemistry class. (a) how many atoms are…
(a) D. $3.22\times 10^{23}$ atoms (b) E. $0.145$ moles (c) B. $48.6$ g Last question: b
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question 6 (2 points) o 15.999 c 12.011 h 1.008 x 13.665 z 29.456 n 14.…
58.77
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question 5 (2 points) how many moles are in 1.40x10^22 formula units of…
$0.0233$
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how many moles are in 12 g of potassium permanganate (kmno₄)? report yo…
Blank 1: 12 g Blank 2: 1 mol Blank 3: 158.0 g Blank 4: 0.076 mol
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what is the mass of 5.60x10^23 molecules of sf₆? (round your answer to …
$135.8$
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match the questions to the correct answers. column a 1. how many partic…
1. a. $3.91\times 10^{23}$ 2. e. $64.6$ 3. d. $95.2$ 4. b. $3.17\times 10^{24}$
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a balloon holds 0.54l of nitrogen gas (n2) at stp. how many grams and m…
F. 0.80 grams, 1.7x10²² molecules
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read the excerpt from act 1, scene 3, of julius caesar. cassius. and wh…
Cassius portrays Caesar as a cruel - hearted tyrant, and at the same time says he pities Caesar because Caesar can't help himself.
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in a reading, you come across a lithium atom represented as li⁺. a neut…
The lithium atom has lost an electron, so it now has 3 protons and 2 electrons.
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in order to observe your crystals as they grow, you... use your estimat…
use your five senses.