化学
化学反应、化学计量、分子结构与元素性质。
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during the analysis, 0.163 g h₂o and 0.600 g co₂ are produced. calculat…
0.0136 mol
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during the analysis, 0.00905 mol h₂o is formed. calculate the amount (m…
0.0181
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during the analysis, 0.163 g h₂o and 0.600 g co₂ are produced. calculat…
$0.00905$
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which orbital diagram has the correct placement for 21 electrons. ○ 3d↑…
The second option (where \(3d\) has one electron with spin - up, \(4s\) is filled with 2 electrons, \(3p\) is filled with 6 electrons, \(3s\) is filled with 2 electrons, \(2p\) is…
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0.400 m kbr express your answer with the appropriate units. br⁻ = value…
Part A: [Br⁻]=0.400 M Part B: [Br⁻]=0.380 M
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15.77 mg libr in 198.6 ml of solution. express the molarity in moles pe…
$9.144\times10^{-4}$
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current attempt in progress list all the valid sets of quantum numbers …
$(4,1, - 1,+\frac{1}{2}),(4,1, - 1,-\frac{1}{2}),(4,1,0,+\frac{1}{2}),(4,1,0,-\frac{1}{2}),(4,1,1,+\frac{1}{2}),(4,1,1,-\frac{1}{2})$
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which 2p subshell has the electrons properly placed? ○ 2p ↑↑ ↑↑ ↑ ○ 2p …
The option with three single - occupied 2p orbitals and electrons having parallel spins (the last option among the ones shown in the typical visual representation where arrows are…
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which 2p subshell has the electrons properly placed? 2p ↑↑ ↑↑ ↑ 2p ↑↓ ↑…
The option with electrons filling each of the three 2p orbitals singly with parallel spins (e.g., arrows all pointing up) before any pairing is the correct one. Among the given op…
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part a 0.45 mol of na2so4 in 7.36 l of solution express the molarity in…
Part A: 0.061 M Part B: 0.389 M
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complete the table | fill - in order | subshell | | ---- | ---- | | 9th…
| Fill - in order | Subshell | | ---- | ---- | | 9th | 5s | | 8th | 4p | | 7th | 3d | | 6th | 4s | | 5th | 3p | | 4th | 3s | | 3rd | 2p | | 2nd | 2s | | 1st | 1s |
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question 5 helium is in group 18 which is part of the \p block\. why is…
Helium can not have more than two electrons.
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question 3 0.2 pts a column in the periodic table is called a \group\ h…
Question 3: 10 Question 4: 14
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question 1 0.2 pts a column in the periodic table is called a \group\ h…
Question 1: 6 Question 2: 6
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atoms, are organized into elements on the periodic table. elements are …
halogens
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drag and drop the words or phrases that accurately complete the summary…
First blank: valence Second blank: properties Third blank: families
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question 1 1 pts indicate if the subshell is possible. 2s choose 3f cho…
2s: possible 3f: not possible 4d: possible 2d: not possible
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part a 0.45 mol of na₂so₄ in 7.36 l of solution express the molarity in…
Part A: 0.061 M Part B: 0.390 M
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which of the following elements can be described as having two valence …
E. Ba
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missed this? watch kcv: limiting reactant, theoretical yield, and perce…
$57.9\%$
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which group does an atom with four valence electrons belong to on the p…
Group 14
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which of the following statements describe the atoms valence electron c…
The valence electrons are found on the outermost ring of electrons.
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determine the limiting reactant for the reaction. mg(s) o2(g) mgo(s) pr…
We need the mass of $Mg$ (or number of moles of $Mg$) to give a numerical answer. If the number of moles of $Mg$ is $n_{Mg}$, the theoretical yield $m = 40.31n_{Mg}\ g$.
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0.230 g al and 1.20 g cl₂. express your answer using three significant …
$1.14$
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2.0 g al and 2.0 g cl2 express your answer using two significant figure…
Part A: $m = 2.5\ g$ Part B: $m = 31.3\ g$
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part a 5 mol mn and 5 mol o₂ express your answer using one significant …
Part A: 5 mol Part B: 5 mol
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when using atwater factors to determine the amount of calories from car…
fiber cannot be broken down in the body, so it is not used for energy
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a scientist would compare data collected with a bomb calorimeter to acc…
calculating the percent difference between the data collected and data on a nutrition label
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the ____ must be collected in order to determine the caloric content of…
change in water temperature
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monosaccharides are the smallest building blocks of sugars and have sim…
B. $C_m(H_2O)_n$
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a bomb calorimeter is used to measure ______ in reactions that occur in…
energy changes
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during the analysis, 0.163 g h₂o and 0.600 g co₂ are produced. calculat…
$0.00905$
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tutor step complete consumption of br₂ yields 0.214 mol of brcl. calcul…
$24.7$
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given that 0.107 mol br2 was consumed, calculate the amount (mol) brcl …
0.214
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the entire mass, 17.12 g, of the reactant br₂ is consumed by the reacti…
$0.1071\ mol$
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the input in a chemical reaction that is changed is called the product …
C. reactant
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the theoretical yield of a reaction is the amount of product obtained i…
$10.57\ g$
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the input in a chemical reaction that is changed is called the ○ produc…
reactant
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question 6 (5 points) retake question which of the following is electro…
K2Cl
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24. all are true about an sds sheet except: (a) is where detailed infor…
24. D. Sections 12 - 15 are mandatory to have completed. 25. C. OSHA
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22. the osha workplace safety ergonomic rules focus on training: (a) pr…
22. B. At time of employment, whenever an “Action Trigger” occurs, and every three years. 23. C. OSHA requires annual training for all staff on access and use of Safety Data Sheet…
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question 5 (5 points) the radius ratio range for tetrahedral coordinati…
B. 0.225 - 0.414 (small cation to large anion)
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question 4 (5 points) eight - fold coordination is also known as? trigo…
D. Cubic coordination
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question 3 (5 points) which has an ionic potential less than 10 nm^-1 (…
K
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question 2 (10 points) which is ionic potential? velocity of light in a…
Charge over radius
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what is the meaning of the word nebulous as used in the passage? use th…
vague
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read the passage. then, select the antonym of the word in bold. reba, a…
Clear
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5. how might the final traces (small amounts) of water be removed from …
5. Heat gently in an oven or use a desiccator with desiccant. 6. Incomplete washing; Re - deposition during drying.
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12. what is the reason that scientists have changed the atomic model? 1…
12. New experimental evidence and advanced theories. 13. The number of protons in the nucleus. 14. Equal number of protons and electrons. 15. The motion of particles slows down. 1…
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7. physical properties: a. what type of elements are good conductors of…
a. Metals b. Non - metals c. Iron, nickel, cobalt d. Increases e. Solids and liquids 8. Atom 9. Protons, neutrons, electrons 10. Protons, neutrons 11. Electron cloud surrounding t…
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a grant for waste recovery a factory produces a waste substance when a …
B. The manufacturing process will make the town safer for residents.
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determine whether each statement is true or false. cohesive forces hold…
1. True 2. False 3. False 4. True 5. False
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select the true statements. when adhesive forces are greater than gravi…
When adhesive forces are greater than gravity, water rises in a capillary tube.
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complete the sentences. less adhesive cohesive greater forces between w…
1. Cohesive 2. Adhesive 3. greater
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determine whether each statement is true or false. a scoop - shaped con…
1. True 2. False 3. True 4. True 5. False
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select the true statements. water rises farther in a narrow glass tube …
Water rises farther in a narrow glass tube than in a wide glass tube. Water molecules are held together by hydrogen bonds as they rise in a capillary tube.
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complete the sentences. forces cause water molecules to stick to the gl…
- Adhesion - Cohesion - Adhesion; cohesion
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complete the sentences. a concave meniscus forms in a glass column when…
A concave meniscus forms in a glass column when adhesive forces between water and glass are greater than cohesive forces between water molecules.
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select the true statements. surface tension only forms on large bodies …
C. Water molecules on the surface are pulled downward by the molecules below. D. Hydrogen bonds between water's surface and a water strider allow it to walk on water.
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select the true statements. cohesive forces push water molecules away f…
B. Cohesion is an attractive force between the same kinds of molecules. C. A water molecule can form hydrogen bonds with several other water molecules. D. The cohesive forces betw…
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are constantly broken and reformed as water molecules slide past each o…
A slightly negative oxygen atom in a water molecule forms a hydrogen bond with a slightly positive hydrogen atom in another water molecule.
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question 21 (1 point) the number of molecules contained in 22.4 l of an…
\(6.02\times 10^{23}\)
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question 18 (1 point) what is the ph of a 0.0001 m aqueous solution of …
4
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question 17 (1 point) if it takes 19 ml of h₂so₄(aq) to neutralize 50.0…
0.11 mol/L
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question 16 (1 point) find the percent concentration (m/v) when 14.2 g …
3.16%
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question 15 (1 point) quantities of water and 8.00 mol/l potassium nitr…
525 mL of 8.00 mol/L potassium nitrate and 175 mL of water
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question 14 (1 point) a solution contains 0.90 g of sodium chloride dis…
0.15 mol/L
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question 12 (1 point) what is the minimum number of moles of hno3 neede…
16
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question 11 (1 point) if 24 g of c is consumed in 2 c + o2 → 2 co, the …
56 g
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question 10 (1 point) what is the percentage, by mass, of oxygen in the…
15.2%
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question 9 (1 point) 4 moles of co2 has mass of. 176 g 112 g 44 g 12 g
176 g
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question 8 (1 point) the gram molecular mass (in g/mol) of h2so4 is 49 …
98
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question 7 (1 point) the reaction: mgcl2(aq) + 2 naoh(aq) → 2 nacl(aq) …
double displacement
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question 6 (1 point) the coefficient of fe3+ in the balanced version of…
3
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question 5 (1 point) the coefficient of o2 in the balanced version of c…
2
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7. what is the main difference between the rhythm of shakespeares poetr…
B. Unlike most poets today, Shakespeare used a regular meter and rhyme scheme.
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question 4 (1 point) which of the following bonds is the most polar? el…
K - Cl
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question 4 (1 point) which of the following bonds is the most polar? el…
The K - F bond is the most polar.
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question 3 (1 point) if ion x has a charge 2+ and ion y has charge 3-, …
\(X_{3}Y_{2}\)
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question 2 (1 point) 1. which of the following is not the correct name …
I. cuprous sulphate
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5. calculate the atomic mass of copper if copper - 63 is 69.17% abundan…
63.62 amu ### 6a.
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the law of conservation of mass says that matter * can not be created o…
1. A. can not be created or destroyed. 2. D. 1100 grams
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what is malleability? * ability to be pulled into a wire will change te…
D. can be hammered/ flattened into sheets
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4. titanium has five common isotopes: $^{46}ti (8.0%)$, $^{47}ti (7.8%)…
$47.923$
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elements found on the left of the zig - zag are called * metals nonmeta…
A. metals
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practice looking at elements on the periodic table by visiting this web…
2 electrons in the inner shell and 6 in the outer shell
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examples of pure substances are * - elements and mixtures - elements an…
B. elements and compounds
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3. strontium consists of four isotopes with masses of 84 (abundance 0.5…
$87.712$
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which of the following are always positive? proton electron neutron ato…
1. proton 2. the same type of atom with different number of neutrons
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part b while studying chemical and physical changes, students added sal…
B. No, it is a physical change. It is salt and water and you can get the salt back by boiling off the water.
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part a consider the images depicting change. which statement accurately…
D. The pipes in image I are going through a chemical change called rusting; the evidence is the color change.
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the stock market and financial markets of the united states and other i…
No information is provided in the given text to determine the number of active participants in the insider - trading scheme. So, it is not possible to answer from the given option…
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when ice melts, what happens to the water molecules? a the attractions …
A. The attractions between the water molecules weaken.
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following is a list of observations from a chemistry laboratory. place …
Evidence of a chemical change: Burning toast, A candle being lit, A car rusting, A white cloudy substance occurs after mixing two clear solutions, Leaves changing color in October…
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the circles and dots in the boxes below represent atoms of two differen…
B. Box M
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which image displays a chemical property about a substance? choose all …
A. II and IV
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question 4 (2 points) saved while assessing a child, a nurse finds a ch…
Question 4: Chemical burns Question 5: Diminished bowel and bladder function Question 6: Superficial burns
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read the excerpt adapted from wikipedia and try answering the question …
B. technical jargon
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what is the formula for dinitrogen tetroxide? * 5 points no4 n4o2 n2o n…
D. N2O4
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which of these is a polar covalent bond? (hint: nonpolar covalent bonds…
H2O