Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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material, pure substance or mixture, element, compound, homogeneous, he…
| Material | Pure Substance or Mixture | Element, Compound, Homogeneous, Heterogeneous | |--|--|--| | concrete | Mixture | Heterogeneous Mixture | | orange juice with pulp | Mixtu…
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1 multiple answer 1 point which electron configurations below are stabl…
$1s^{2}2s^{2}2p^{6}$, $1s^{2}2s^{2}2p^{3}$, $1s^{2}2s^{2}$, $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}$, $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}$
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question 7 points 1 if you want to prepare ozone, you will need _______…
a molecule of oxygen and one nascent oxygen
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question 4 points 3 which of the following best explains why the use of…
The gases that are released cause the reduction of level of ozone in the stratosphere.
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periodic table metals vs. nonmetals match the description on the left w…
18. D. nonmetals 19. C. metals 20. C. metals 21. D. nonmetals 22. C. metals 23. O < Se < K < Cs 24. P < Ti < Fe < Ba 25. Rb < Sn < Xe < Ar 26. Sr < Mg < C < F 27. S. transition me…
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most new cars and trucks are fitted with catalytic converters. catalyti…
D. $\mathrm{CO_2}+\mathrm{H_2O}$
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a variety of air pollution control devices remove pollutants from indus…
B. scrubbers
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question 4 points 3 assertion (a): the ozone layer protects the earth f…
(A) is true, but (R) is false
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which of the following best completes the analogy? carbon dioxide/gas/c…
A. Carbon dioxide/Gas/Carbonic acid
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do now: 1. which of the following is not a characteristic of a physical…
1. d. new substance 2. c. mass 3. Look for changes in physical properties like state, shape, size, color, or texture without the formation of new substances.
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complete lo siguiente basándose en los resultados del experimento virtu…
1. alta 2. baja 3. más alto 4. uniforme
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• escriba explicaciones científicas sobre “el permanganato de potasio s…
# Explicación: ## Paso 1: Comprender el concepto de difusión La difusión es el movimiento de moléculas de alta a baja concentración. ## Paso 2: Aplicar al caso del permanganato de…
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3. vertical columns on the periodic table are called 4. horizontal rows…
3. Groups 4. Periods 5. Atomic 6. Mass 7. Transition metals 8. Alkali metals 9. Alkaline - earth metals 10. Noble gases 11. Halogens 12. 1 13. 17 14. 18 15. Ductility 16. Malleabi…
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1. tell which element is located in the following groups and periods. a…
a. Calcium (Ca) b. Iodine (I) c. Krypton (Kr) d. Indium (In) e. Iron (Fe) f. Gold (Au) g. Lithium (Li) h. Titanium (Ti) i. Silicon (Si) j. Fluorine (F) k. Calcium (Ca) l. Sodium (…
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a solution of salt water was placed in the evaporating dish. the burner…
The white crystal solid is salt (sodium chloride). It is a compound.
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complete the following table: element electron config. highest e level?…
| Element | Electron Config. | Highest E level | # Valence e⁻ | # of protons | Is it stable? | | ---- | ---- | ---- | ---- | ---- | ---- | | Carbon | $1s^{2}2s^{2}2p^{2}$ | 2 | 4 …
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23. why does a chemical reaction that makes the mixture feel cold indic…
Thermal energy is absorbed from the surroundings.
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22. which of the following equations correctly shows the endothermic re…
B. $2Al_2O_3(s)+3C(s) + \text{heat} ightarrow4Al(s)+3CO_2(g)$
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the ph scale coffee egg white 20. a 3 soda b 5 water c 7 d 9 ammonia so…
The hydroxide and hydrogen ion concentrations are equal at neutral pH.
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hay cuatro ideas principales detrás de la teoría de partículas de la ma…
partículas, movimiento, rapidez, espacios, atracción - repulsión
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which element shares similar properties with zinc (zn)? mercury (hg) ti…
Mercury (Hg)
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the number in each square of the periodic table tells us the atomic num…
B. Sulfur (S)
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which element shares similar properties to aluminum (al)? gallium (ga) …
Gallium (Ga)
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name: ______________ block: ______________ progress check atomic radius…
Potassium is larger than calcium because of weaker nuclear - attraction on outer electrons in the same period. Antimony is larger than phosphorus due to more electron shells down …
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which element shares similar properties to chlorine (cl)? fluorine (f) …
Fluorine (F)
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banco de palabras atracción sólido partículas asunto movimiento gaseoso…
sólido líquido gaseoso
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which element shares similar properties with calcium (ca)? scandium (sc…
Strontium (Sr)
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19. which products best complete the balanced equation between sulfuric…
B. $Na_2SO_4 + 2H_2O$
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pregunta de asistencia instrucciones ● lea el pasaje a continuación y u…
partículas, masa, espacio, partículas
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pregunta de asistencia instrucciones: lea el pasaje a continuación y us…
La química estudia la composición, la estructura, las propiedades y las reacciones de la materia. Todo lo que nos rodea está hecho de materia. Todo lo que tiene masa y ocupa espac…
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5. how many moles are in 30.0 g argon? 0.751 mol 1.20 x 10³ mol 1.33 mo…
0.751 mol
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which of these work together to attach to rock to chemically change roc…
pioneer species
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4. how many grams are in 1 mole of nitrogen? 58.69 g 14.01 g 20.18 g 7 …
14.01 g
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3. a balloon contains 4.50×10²¹ atoms of helium (he) gas. calculate the…
$0.0299$ g
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2. calculate the number of molecules in 2.5 mol of sucrose.
1.51×10^24 molecules
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1. calculate the number of moles in 3.79×10²³ molecules carbon dioxide.…
0.630 mol
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95 multiple choice 1 point during an infection control audit, ppe stora…
D. Store PPE in a clean, dry, temperature - controlled environment
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table 1.4: concentrations of the six most common ions in seawater. ques…
### Pregunta 1 # Explicación breve: Los beneficios científicos, económicos y ecológicos justifican el costo. El conocimiento científico de los océanos puede llevar a avances en me…
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86 multiple choice 1 point a technician inadvertently shortens the disi…
Incomplete disinfection resulting in potential pathogen survival and transmission
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which of the following atoms would be electrically neutral? 10 protons,…
5 protons, 10 neutrons, 5 electrons
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84 multiple choice 1 point which of the following best describes the di…
D. Cleaning removes visible soil, disinfection kills most pathogens, and sterilization destroys all microorganisms including spores.
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83 multiple choice 1 point when using chemical sterilants such as ethyl…
D. Ensuring proper ventilation
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what best describes a limitation of the bohr model, which depicts elect…
Electrons move in a solar - system spiral around the nucleus in the modern atomic model. (This option highlights the incorrectness of the Bohr Model's fixed - orbit concept compar…
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silicon is the second most abundant element in the earth’s crust. it is…
28.1 amu
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79 multiple choice 1 point what should a medical assistant do with an i…
C. Clean it first to remove the organic material
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which of the following best represents a pair of isotopes? carbon - 12 …
Carbon-12 and Carbon-14
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based on the periodic table block for nitrogen shown below, what nuclei…
$_{7}^{14}N$
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the image below shows a model of a lithium atom. how many neutrons are …
4
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most of the ice found on earth is ice ih, distinguished by a crystallin…
B. amorphous ice lacks the thermal energy to form the crystals found in ice Ih.
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which statement best describes the particle diagram below? this is a mi…
This is a mixture of molecules/compounds.
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61 multiple choice 1 point a medical assistant notices a colleague cons…
D. Facilitated transmission of pathogens and an increased risk of healthcare - associated infections
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how did soldiers adapt to the use of chemical weapons? they began to we…
They began to wear protective masks and clothing.
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select the correct answer. who is the target audience for the passage? …
D. amateur gardeners
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53 multiple choice 1 point what is the primary purpose of a negative ai…
To prevent cross - contamination of airborne pathogens
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51 multiple choice 1 point in an outbreak involving multidrug - resista…
C. Increase cleaning frequency and use disinfectants effective against resistant strains
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in which group of elements does tellurium (te) belong? (1 point) transi…
C. metalloids
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based on patterns in the periodic table, which element is the least mal…
phosphorus (P)
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how does mercury differ from other metals? (1 point) it does not chemic…
It is not solid under normal conditions
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the titration of vitamin c with iodine proceeds according to the given …
$6.16\times10^{-5}\ mol$
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an element is highly conductive, highly reactive, soft, and lustrous. t…
B. alkali metals
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the titration of vitamin c with iodine proceeds according to the given …
$7.91\times 10^{-5}\ mol$
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which are career and technical student organizations? select six option…
Business Professionals of America DECA Future Business Leaders of America FFA SkillsUSA FCCLA
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43 multiple choice 1 point when using chemical disinfectants in a healt…
D. Safety Data Sheets (SDS)
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37 multiple choice 1 point if a previously used instrument with visible…
The sterilization process is compromised due to interference by organic material
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32 multiple choice 1 point a facility has begun reprocessing reusable p…
D. Following facility - specific protocols for laundering or chemical disinfection as specified by infection control policies
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28 multiple choice 1 point during an infection control audit, a room is…
B. Use portable HEPA filters and improve air exchange rates
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27 multiple choice 1 point in reviewing safety data sheets (sds) for a …
B. Information on corrosivity and potential for skin or eye irritation
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which of the following gives number of neutrons in an element? clear al…
A. (Atomic mass - Atomic number) of the element
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4 which of the following is not correct for isotopes? they have same at…
They have same number of neutrons
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question 9 (mandatory) (1 point) listen a ¹⁶₈o²⁻ ion has ________ proto…
E. 8; 8; 10
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click here to access the interactive simulation. you will practice bala…
In level 1: 2 In level 2: 1 In level 3: 6
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question 6 (mandatory) (1 point) listen the absorption and emission spe…
C. electrons ### Question 7
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question 3 (mandatory) (1 point) saved isotopes have the same a) atomic…
Question 3: B. number of protons but a different number of neutrons Question 4: Not provided in options (should be de Broglie)
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question 1 (mandatory) (1 point) a $_{17}^{35}$cl atom has _________ pr…
A. 17; 18; 17
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1) what are the three states that water can exist in? 2) what is the sc…
1. Solid, Liquid, Gas 2. Hydrologic Cycle 3. TRUE 4. Precipitation 5. Lemon juice; evaporation and condensation processes similar to water - cycle 6. FALSE 7. TRUE 8. Condensation…
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16 multiple choice 1 point which of the following is the correct defini…
B. An inanimate object that can harbor and transmit infectious agents.
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14 multiple choice 1 point when reprocessing equipment contaminated wit…
A. Utilize autoclaving to ensure spores are effectively destroyed
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and computer models. while the theory of constant proportions has not c…
1. Understanding climate - related processes, discovering new species, and exploring resources. 2. High cost, perception issues, but importance for climate and biodiversity. 3. Us…
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6 multiple choice 1 point what information must be included in a safety…
D. Hazard identification, first aid measures, handling and storage, and exposure controls/personal protection
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1) what are the three states that water can exist in? 2) what is the sc…
1. Solid (ice), liquid (water), gas (water - vapor) 2. Hydrologic cycle 3. True 4. Precipitation 5. Lemon juice; water in lemon juice evaporates similar to evaporation in the wate…
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part ii - isotopes and average atomic mass (unit 2) elements occur as a…
1. $178.6$ u 2. $24.31$ u 3. $6.935$ u 4. $238.0$ u 5. $47.92$ u
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decide whether each sentence is punctuated correctly. use the drop - do…
1. Correct 2. Incorrect; change to "I plan to go skiing with my sisters, and Charles and Boris." 3. Incorrect; change to "Mariana hopes to study chemistry, geometry, and Italian."
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what is an example of irrigation? (1 point) chemicals getting into a wa…
sprinklers being used to water crops
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what is an example of irrigation? (1 point) ships moving goods to ports…
C. sprinklers being used to water crops
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working with enthalpies of reaction and combustion the enthalpy of comb…
$10148$
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calculating enthalpy of reaction compound δh (kj/mol) c6h6 (g) 82.90 co…
$-3169\ kJ/mol$
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determining enthalpy of formation which of these statements are true? c…
The $\Delta H_f$ for $Cl_2(g)$ is 0 kJ/mol, The $\Delta H_f$ for $Br_2(l)$ is 0 kJ/mol, The $\Delta H_f$ for $Hg(l)$ is 0 kJ/mol.
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chemistry atomic structure practice 1 x = element symbol a = mass numbe…
| Name | Symbol | Z | A | #p | #e | #n | Isotopic Symbol | |---|---|---|---|---|---|---|---| | Sodium | Na | 11 | 23 | 11 | 11 | 12 | \(_{11}^{23}Na\) | | Chlorine | Cl | 17 | 35 …
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isotopes and average atomic mass part i: match the word with its defini…
1. $126.9$ amu 2. $55.85$ amu
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calculating enthalpy of reaction ammonia nh₃(g), δhf = - 46.19 kj/mol r…
-175.91 kJ; Exothermic
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recognizing enthalpy of formation which substances have δhf = 0 kj/mol …
$Br_2(l)$, $O_2(g)$, $He(g)$, $Fe(s)$
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check the statements that are a part of the early atomic theory. check …
All of the boxes (Atoms cannot be created or destroyed during a chemical reaction; Atoms combine in whole - number ratios to form compounds; Scientists believe that the atom is ma…
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provide 3 missing symbols and 1 number 208 0 208 a + b_orbital → c 83 -…
1. N. Bi 2. M. e 3. O. Pb 4. P. 82
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provide 3 missing symbols and 2 numbers 16 4 d 1 n + a → b + c e 2 9 0 …
1. E. He 2. A. $\gamma$ (gamma) 3. M. e 4. 88 5. 90
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provide 2 missing symbols and 3 numbers a 110 134 d cm → ru + b + c 96 …
A. 248 B. Sn C. He D. 4 E. \(\gamma\) (gamma)
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provide 2 missing symbols and 2 numbers 188 188 c w → a + b 74 75 d a =…
1. A. $\gamma$, gamma 2. I. 188 3. C. 232 4. K. Re
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provide 4 missing symbols and 2 numbers 232 e 4 0 a → b + c + d 90 88 f…
1. C. 232 2. E. He 3. A. $\gamma$, gamma 4. B. 0 5. F. Th 6. G. 4
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question 10 (0.16666666 points) ar has a larger radius than cl true fal…
Question 10: B. False Question 11: B. False
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question 7 (0.166666667 points) c has more nonmetallic properties than …
Question 7: B. False Question 8: B. False Question 9: A. True
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question 4 (0.166666667 points) cl has a greater ionization potential t…
Question 4: True Question 5: False Question 6: True