Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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5.6x10-12 l of carbon dioxide gas is equal to how many molecules?
$1.5055\times 10^{11}$ molecules
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a chemist creates 180 milliliters of a 42.5% alcohol solution by combin…
\(\begin{cases}x + y=180\\0.15x + 0.7y=76.5\end{cases}\)
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an ionic compound with +1 and -3 ions cation anion formula name
| cation | anion | formula | name | |--------|-------|---------|------| | $\ce{Na+}$ | $\ce{N^{3-}}$ | $\ce{Na3N}$ | sodium nitride | (Note: Other examples are also possible, e.g.…
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the thing about having an old soul is that no one can see that its ther…
D. The use of line breaks in the third stanza emphasizes that the elderly speaker is struggling to organize his thoughts.
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while a neat and tidy patch of grass might seem attractive, it adversel…
B. Lawns pose a serious threat to bee populations because they replace native plants.
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complete the rhyme scheme. if i am happy, and you, a and there are thin…
C, B
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complete the rhyme scheme. a b the glory of the day was in her face, a …
Third line: A, Fourth line: B
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a sample of hydrogen gas exerts a pressure of 456 torr in a container. …
C) 0.613 atm
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identifying the causes of precocious puberty in the united states, the …
exposure to pollutants, exposure to phthalates, unhealthy weight gain, disruptions to the endocrine system
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three laws of thermodynamics the first law of thermodynamics says in an…
1st law # 2.
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5. calculate the number of grams of nh₃ produced by the reaction of 6.7…
Approximately $\boldsymbol{8.14\space g}$ (or $8.13\space g$ depending on significant figures) of $\ce{NH3}$ is produced.
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list at least three (3) characteristics of carbon that make it a unique…
1. Tetravalency: Carbon has 4 valence electrons, enabling it to form 4 covalent bonds. 2. Catenation: Carbon atoms can bond to form long chains, rings, or branched structures. 3. …
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use the scaffold below to critique the two possible claims and to const…
## Scaffold Completion: - **Possible Claim #1**: chemical reactions - **Possible Claim #2**: nuclear fusion reactions - **Evidence for Claim #1**: (No valid evidence—chemical reac…
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question 16 (1 point) how would fdrs court - packing scheme have change…
B. It would have expanded the Court by allowing the president to appoint new justices when existing justices turned 70.
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question 10. a student calculates the density of iron as 6.80 g/cm³ by …
13.5%
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question 7. a student measures the mass of a sample as 9.67 g. calculat…
1.53%
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question 3. a chemical reaction was carried out three times. the mass o…
b) precise.
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question 2. three students were asked to determine the volume of a liqu…
a) Student C b) Student B
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put the letter of the answer. * level 1 q1 which of the following chemi…
A. \(N_2\)
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question 2 fossil fuels and farming chemicals contribute to ___________…
air pollution
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(b) the grid below represents part of the periodic table. study it and …
- (i) The element with the shortest atomic radius in period 3 is the right - most element (assuming the grid follows the periodic table trend). Reason: As we move from left to rig…
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pregunta 1 name ( mathrm{al}_{2} mathrm{o}_{3} ). dialuminum trioxide n…
1. Aluminum oxide 2. Potassium Sulfide
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pregunta 3 1 pts name alcl3. aluminum chloride monoaluminum trichloride…
Pregunta 3: Aluminum Chloride Pregunta 4: calcium iodide
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pregunta 7 1 pts write the correct name for this compound: ba₃n₂ pregun…
- Pregunta 7: Bario nitruro - Pregunta 8: Estroncio óxido
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pregunta 5 1 pts write the correct name for this compound: li₂s pregunt…
Pregunta 5: Sulfuro de litio Pregunta 6: Cloruro de magnesio
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pregunta 3 1 pts give the name for babr₂. o barium 2 - bromide barium b…
Pregunta 3: barium bromide Pregunta 4: sodium iodide
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pregunta 1 1 pts give the name for cal₂. calcium diiodide carbon iodide…
1. calcium iodide 2. aluminum iodide
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arrangement #1 arrangement #2 detergent = which of the following best d…
Detergents will form micelles like arrangement #2 because the polar part of the detergent is more attracted to the polar water molecules.
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3. which member of each pair is more soluble in water? why? (a) ( mathr…
- (a) \(CH_3CH_2OCH_3\) is more soluble in water. It has a smaller non - polar group, making it more polar and better at forming hydrogen bonds with water. - (b) Tetrahydropyran i…
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pregunta 4 1 pts arrangement #1 arrangement #2 detergent = will deterge…
Arrangement #2
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pregunta 3 1 pts which of the following statements best explains the st…
"Detergents are both polar and nonpolar because it must have a polar side that can interact with water and have a nonpolar side that can interact with oil."
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pregunta 2 1 pts structure 1 structure 2 structure 3 which of the follo…
Estructura 2
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pregunta 1 1 pts when a detergent is added to an oil - water mixture, t…
both polar and nonpolar
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2. what is the strongest type of intermolecular force between solute an…
(a) Dipole - dipole interaction. (b) London dispersion force (induced dipole - dipole interaction). (c) London dispersion force.
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2. what is the strongest type of intermolecular force between solute an…
(a) Dipole - dipole interaction (b) London dispersion force (induced dipole - dipole interaction) (c) London dispersion force
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pregunta 6 1 pts when detergent is added to water and oil, the detergen…
micelas
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pregunta 5 1 pts how is the behavior of detergents different from the p…
The detergent molecules are able to interact with both polar and nonpolar molecules whereas polar and nonpolar molecules are only able to interact with other molecules that have t…
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pregunta 4 1 pt your chemistry teacher provided a mystery substance for…
The mystery substance is most likely nonpolar because it cannot dissolve in water but can dissolve in oil.
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in the image above, the blue background is water, the yellow background…
Micelle
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in the image above, the blue background is water and the yellow backgro…
# Explicación breve: La ley "lo semejante se disuelve en lo semejante" establece que las sustancias polares se disuelven en disolventes polares y las no polares en disolventes no …
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in the image above, the blue background is water and the yellow backgro…
magenta; because they interact with the nonpolar oil more.
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level 1 why is carbon a very important element? a. carbon is the centra…
A. Carbon is the central element to all living organisms
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what has the most control over water being a gas, liquid or solid ice? …
B. It’s temperature
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level 3 q3 water is made up of two atoms of hydrogen and one atom of a.…
C. Oxygen
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level 2 q1 during condensation water changes from a ______ to a ______.…
B. Gas, Liquid
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take quiz exit you started this quiz near when it was due, so you wont …
A. high temperature and low pressure
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take quiz exit you started this quiz near when it was due, so you wont …
C. directly related to amount of gas
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question 23 4 pts kinetic molecular theory predicts that pressure rises…
C. there are more frequent and more powerful collisions
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question 22 4 pts which gas will have the greatest rate of effusion at …
\(\text{CH}_4\) (the option corresponding to \(\text{CH}_4\))
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question 21 4 pts automobile air bags use the decomposition of sodium a…
\( \approx 71.0 \text{ g} \) (or more precisely, around 70.9 - 71.1 g depending on calculation precision)
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question 20 4 pts there are two samples of gas in 10l containers at sta…
Neither Container
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chapter 5 - gases examination arted: nov 23 at 9:31pm quiz instructions…
0.68
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question 18 4 pts the ideal gas law is stated as the equation, pv = nrt…
D. mol
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which term expresses the pressure of a mixture of two ideal gases, a an…
\((n_A + n_B)\frac{RT}{V}\) (the first option)
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chapter 5 - gases examination started: nov 23 at 9:31pm quiz instructio…
B. Volume, moles, pressure, temperature
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question 15 one mole of argon, ar(g), is heated from 20°c to 30° in a p…
- \(V\) (Volume) is changed (as volume increases). - \(T\) (Temperature) is changed (as it is heated from \(20^\circ\text{C}\) to \(30^\circ\text{C}\)). - \(P\) (Pressure): If the…
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question 14 one mole of argon, ar(g), is heated from 20°c to 30°c in a …
- T (Temperature) - P (Pressure)
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question 13 which of the early laws of gases describes the relation bet…
B. Charles’s Law
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question 12 one mole of a gas in a 1.0l closed container is heated from…
\( \boldsymbol{\frac{P_1}{T_1}=\frac{P_2}{T_2}} \) (the second option in the given choices)
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question 11 which of the early laws of gases describes the relation bet…
D. Avogadro’s Law
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question 10 the amount of gas in a 1.0l closed container is increased. …
\( \boldsymbol{\frac{P_1}{n_1}=\frac{P_2}{n_2}} \) (the option with \( P_1/n_1 = P_2/n_2 \))
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chapter 5 - gases examination started: nov 23 at 9:31pm quiz instructio…
\( 0.0679 \) liters
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chapter 5 - gases examination started: nov 23 at 9:31pm quiz instructio…
\( \approx 1.2 \, \text{mol} \) (or more precisely \( \approx 1.17 \, \text{mol} \))
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question 4 4 pts identify the element that is a gas at normal atmospher…
C. Neon
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question 2 which best identifies what is termed a gas? nonmetal element…
C. One or more substances in the gas phase
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question 1 which elements in group 7a are gases under normal conditions…
F. F, Cl. Cl
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16. identify the following atoms as either paramagnetic or diamagnetic.…
To determine if an atom is paramagnetic or diamagnetic, we check the electron configuration for unpaired electrons. Paramagnetic atoms have unpaired electrons, while diamagnetic a…
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12. base your answer(s) to the following question(s) on the information…
First shell: 2 electrons; Second shell: 2 electrons.
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a 3.50 l sample of hydrogen gas has a pressure of 0.750 atm. what is it…
\( 1.75 \, \text{L} \) (corresponding to the option "1.75 L")
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nan₃(s) → na(s) + n₂(g) when the air bag inflates, the nitrogen gas is …
The volume of nitrogen gas at STP is approximately $47.2\ L$.
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predict whether a bond between aluminum (al) and fluorine (f) would be …
The bond between aluminum (Al) and fluorine (F) is ionic. Aluminum is a metal and fluorine is a non - metal. Metals tend to lose electrons and non - metals tend to gain electrons.…
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3. rachels chemistry class has 4 unit exams and a final. she needs at l…
Rachel needs at least a 90 on her final exam.
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coulombs law problems: 1. which of the three elements has the least amo…
1. C. I 2. C. S
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solve the following ph problems a) if the ph is 10.85 and you have 3.05…
\( \approx 0.0630 \, \text{g} \) ### Part (b)
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6. using coulombs law, approximate the force of attraction between the …
To solve this problem, we follow these steps: ### Step 1: Determine the atomic number of selenium Selenium (Se) has an atomic number \( Z = 34 \). This means the nucleus has 34 pr…
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a chemist is using 388 milliliters of a solution of acid and water. if …
\(60.9\)
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5 using coulombs law, approximate the force of attraction between the o…
### Part 1: Estimate Effective Nuclear Charge (\(Z_{eff}\)) using Slater’s Rules #### Step 1: Electron Configuration of Oxygen Oxygen has an atomic number \(Z = 8\), so its electr…
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which of the following compounds has an overall molecular dipole moment…
\( \text{CHF}_3 \), \( \text{HCl} \), \( \text{CO} \)
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predict the molecular geometries of all the following compounds using v…
s: a) $\ce{SiF4}$: tetrahedral b) $\ce{OF2}$: bent c) $\ce{OCF2}$ (central $\ce{C}$): trigonal planar d) $\ce{PCl3}$: trigonal pyramidal e) $\ce{CO2}$: linear
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which of the following molecules contains at least one atom that has an…
The molecule that contains at least one atom with an odd - electron count (is a free radical) is \(\boldsymbol{NO}\)
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3. using coulombs law, approximate the force of attraction between the …
### Step 1: Determine the electron configuration of nitrogen Nitrogen has an atomic number of 7, so its electron configuration is \(1s^2 2s^2 2p^3\). ### Step 2: Apply Slater's ru…
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5. using coulombs law, approximate the force of attraction between the …
To solve this problem, we follow these steps: ### Step 1: Determine the electron configuration of oxygen Oxygen has an atomic number of 8, so its electron configuration is \(1s^2 …
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according to the textbook what is the definition of \electron configura…
the arrangement of electrons in the orbitals of an atom (the second option)
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according to the textbook what is the definition of \electron configura…
B. the arrangement of electrons in the orbitals of an atom
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how do mangroves help the florida coastline? a) they protect against lo…
C) They protect against wave erosion.
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collecting rain samples rico and mia noticed something odd was happenin…
D) Sample 4
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q4. we need to dilute 80 cc of a 2.5 % solution to 340 cc. what is the …
The concentration of the 340 - cc solution is approximately $0.59\%$ (or more precisely $\approx 0.588\%$).
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according to figure 15 on page 117, how many electrons can occupy the s…
C. 8
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according to figure 15 on page 117, how many electrons can occupy the s…
8 (corresponding to the option with "8")
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according to figure 15 on page 117, how many orbitals can be found in t…
C. 9 (assuming the options are labeled with C for 9; if the original options had labels like A. 2, B. 8, C. 9, D. 18, then the answer is C. 9)
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according to the textbook what is the definition of \orbitals\. * 1 poi…
C. a region of space around the nucleus where an electron is likely to be found
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according to the textbook what is the definition of \electron cloud\. *…
A. a visual model of the most likely locations for electrons in an atom
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which of the following statements was bohr incorrect in assuming about …
B. electrons move like planets in a solar system
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an electron in an atom can move from one energy level to another when *…
C. the atom gains or loses energy.
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what ground state to excited state combination gives sp hybridization w…
a to b
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how many different molecules are drawn below?
3
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complete the rhyme scheme. across the sky a lowly sigh from west to eas…
a, b, a, b, c, c
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answer the questions below about the highlighted atom in this lewis str…
(Sigma Bonds): 2 ### Part 2: Pi Bonds
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this sketch of a neutral molecule is shaded red or blue wherever the el…
A. ClF, B. HF, C. HCl
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fix any errors in these proposed electron configurations. number of ele…
To fix the errors in the proposed electron configurations, we analyze each case based on electron configuration rules (Aufbau principle, Pauli exclusion principle, and Hund's rule…