化学
化学反応、化学量論、分子構造、元素の性質。
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in the production of printed circuit boards for the electronics industr…
Mass of \(\ce{Cu(NH3)4Cl2}\): \(2.20\times 10^{6}\space g\) Mass of \(\ce{NH3}\): \(7.40\times 10^{5}\space g\)
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a piece of solid carbon dioxide, with a mass of 20.2 g, is placed in an…
(a) Pressure = \(2.61\space atm\) (b) Partial pressure of \(CO_2=2.61\space atm\), Total pressure = \(3.55\space atm\)
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match the following ph values: 1, 2, 5, 6, 6.5, 8, 11, 11, and 13 with …
- \(HBr:1\) - \(NaOH:13\) - \(NaF:8\) - \(NaCN:11\) - \(NH_{4}F:6.5\) - \(CH_{3}NH_{3}F:6\) - \(HF:2\) - \(HCN:5\) - \(NH_{3}:11\)
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consider the reaction fe³⁺(aq) + scn⁻(aq) ⇌ fescn²⁺(aq) a. how will the…
a. The reaction will shift to the left b. The reaction will shift to the left c. The reaction will shift to the left d. The reaction will shift to the right
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at a particular temperature, a 3.0 - l flask contains 1.5 moles of cl₂,…
\(4.0\times 10^{-6}\)
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at 1100 k, ( k_{p}=0.15 ) for the reaction ( 2 mathrm{so}_{2}(g)+mathrm…
\(14\)
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you have two distinct gaseous compounds made from element x and element…
atomic mass \(X = 16\), atomic mass \(Y = 46.5\)
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phosphorus can be prepared from calcium phosphate by the following reac…
\(165\)
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this question has multiple parts. work all the parts to get the most po…
\(0.00965\)
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consider the flask diagramed below. 2.00 l h₂ 505 torr 1.00 l n₂ 0.255 …
- Partial pressure of \(H_2 = 337\) torr - Partial pressure of \(N_2 = 64.6\) torr - Total pressure \(= 402\) torr
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a mixture of 1.00 g h₂ and 1.50 g he is placed in a 1.00 - l container …
\(P_{H_2}\approx12.3\space atm\), \(P_{He}\approx9.23\space atm\), \(P_{total}=21.5\space atm\)
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sf₆ is... a. a polar molecule with polar bonds. b. a nonpolar molecule …
B. A nonpolar molecule with polar bonds
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12. what mass of water can be heated from 25.0°c to 50.0°c by the addit…
$27.0\ g$
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the vagus and glossopharyngeal nerves carry afferent signals from perip…
dorsal respiratory group
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select the correct answer from each drop - down menu. why are biogeoche…
The first blank is "is fixed" (assuming it's a drop - down option related to a fixed amount as Earth is a closed system). The second blank is "renew".
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what is the shape of water? which statement gives the correct molecular…
bent
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complete each sentence with the correct word. 1. the (click to select) …
1. dorsal respiratory group 2. pontine respiratory group 3. ventral respiratory group 4. central chemoreceptors 5. peripheral chemoreceptors
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the partial pressure of a gas is measured in millimeters of mercury. tr…
True
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what is the molecular geometry for two electron groups (as in co₂)? lin…
linear
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how many valence electrons are in co₂? fill in blank
16
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some scientists think so a princeton university study of rats found tha…
D. Some people's brains respond to junk food like an illegal drug
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is junk food habit - forming? some scientists think so. a princeton uni…
B. Researchers said the lasting changes in the rats' brain chemistry were similar to that of people who have abused morphine or heroin.
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select the true statement for a diatomic molecule. if the bond is polar…
If the bond is polar, the molecule is polar.
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describe the correct structure for pcl₃. the structure should have trig…
tetrahedral electron geometry and trigonal pyramidal molecular geometry
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part b describe the correct structure for h₂se. the structure should ha…
tetrahedral electron geometry and bent molecular geometry.
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missed this? watch iwe: determining whether a molecule part a which bon…
A bond between \(C\) and \(O\)
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can you briefly describe the causes of each of the three types of strok…
- Ischemic stroke: Blocked blood vessel (e.g., clot). - Hemorrhagic stroke: Blood vessel rupture (e.g., aneurysm). - Transient ischemic attack (TIA): Temporary clot - like blockag…
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exercise 10.85 - enahnced - with feedback arrange the following diatomi…
$\text{CO}$, $\text{HBr}$, $\text{ICl}$, $\text{H}_2$
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part h determine the molecular geometry of pf₃. trigonal planar bent tr…
trigonal pyramidal
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determine the electron geometry of pf₃. linear pentahedral trigonal pla…
tetrahedral
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determine the molecular geometry of h₂s. trigonal planar tetrahedral be…
bent
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determine the electron geometry of h₂s. pentahedral trigonal planar hex…
tetrahedral
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determine the molecular geometry of so₂. bent trigonal pyramidal tetrah…
bent
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determine the electron geometry of so₂. hexahedral linear pentahedral t…
trigonal planar
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determine the molecular geometry of n₂o (oxygen is terminal). tetrahedr…
C. linear
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determine the electron geometry of $n_2o$ (oxygen is terminal). trigona…
linear
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a chemist has three different acid solutions. the first acid solution c…
The chemist should use \(200\) liters of \(20\%\) solution, \(20\) liters of \(40\%\) solution, and \(60\) liters of \(60\%\) solution.
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which type of rock is characterized by layers and bands of minerals cau…
foliated
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synthesize it! select the correct statement(s). the particles of a gas …
- "The particles of a gas are at a higher temperature than its solid or liquid form. They have more kinetic energy. They have a lower density." - "Particle motion increases as tem…
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why does a pot of water boil at a higher temperature at sea level? sele…
At sea level, the air pressure is lower, so the air exerts less force against the water molecules of water must be at a lower temperature to have enough kinetic energy to change f…
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observe the simulation that shows how changing the temperature of the g…
The particles of gas collide more often and with more force at a higher temperature, so they take up more space; Increasing the temperature increases the volume of the gas.
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6. jill (a not - so - smart scientist) went ahead and put magnesium met…
\(Mg(s)+Br_2(l)\to MgBr_2(s)\) ### 6. b)
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choose the more metallic element from each pair. match the elements in …
Between As and Bi, the more metallic element is Bi. Between Rb and Sn, the more metallic element is Rb. Between F and As, the more metallic element is As. Between Ge and N, the mo…
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7. use the following chemical formulas (a-d) of the phosphorus tetramer…
a) B b) D c) A, C d) A e) A f) E
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practice it! select the true statement. changes in volume and pressure …
Changes in volume and pressure affect gases.
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required information what determines the direction of gas movement? mul…
The partial pressure differences.
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practice it! study the diagram. select the correct statement(s). when a…
When a liquid changes into solid, it is called freezing. When a gas changes into a solid, it is called deposition. When a solid changes into a liquid, it is called melting. When a…
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pick the larger species from each pair. match the words in the left col…
When comparing the two species \(P\) and \(P^{3 -}\) the larger of the two is \(P^{3 -}\). When comparing the two species \(Ba\) and \(Ba^{2+}\) the larger of the two is \(Ba\). W…
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pick the larger species from each of the following pairs. match the wor…
Between \(Li\) and \(Li^{+}\), the larger species is \(Li\). Between \(I^{-}\) and \(Cs^{+}\), the larger species is \(I^{-}\). Between \(Mo\) and \(Mo^{3+}\), the larger species …
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select the correct statement(s). the particles of a solid have less kin…
- The particles of a solid have less kinetic energy than its liquid or gas form. They are at a lower temperature. - The particles of gases are more free to move than in liquids an…
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choose the larger atom from each pair. match the items in the left colu…
When comparing the two elements \(Te\) and \(Br\), the larger element is \(Te\) based on periodic trends alone. When comparing the two elements \(Cl\) and \(Mg\), the larger eleme…
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7.4 and 7.5 rational equations homework score: 19.8/25 answered: 21/25 …
$\frac{35}{3}\approx11.67$
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directions: 1. add or remove heat to change the temperature of neon. 2.…
The correct statements are: "The temperature of neon as a solid is lower than when it is a liquid or a gas.", "The particles of neon move the fastest when it is a gas.", "This is …
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choose the larger atom from each of the following pairs. match the symb…
Between \(I\) and \(Kr\), the larger atom is \(I\). Between \(Si\) and \(Sn\), the larger atom is \(Sn\). Between \(S\) and \(Sb\), the larger atom is \(Sb\). Between \(B\) and \(…
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practice it! the ice cube and the frozen lake are both the same tempera…
The frozen lake has more thermal energy. It is composed of more water molecules and has more mass.
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in a chemical formula, how do you calculate the number of atoms of an e…
For the first question: By multiplying the parentheses subscript by the subscript of each element within the parentheses. For the second question: \(Mg(C_2H_3O_2)_2\), the number …
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which of the following substances can have variable composition? view a…
air
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which elements combine to form ordinary table salt? view available hint…
sodium and chlorine
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question 1 where does most chemical digestion take place? small intesti…
Small intestine
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which are the reactants in the following reaction? 2mg + o₂ → 2mgo
\(Mg\) and \(O\)
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in a reaction a + b → c, reactant a has 5g and product c has 9g. how ma…
\(4g\)
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what will weigh more when a chemical change is complete? the reactants …
They both will weigh the same.
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how many hydrogen atoms are present in the product of the following equ…
\(4\)
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since gasses weigh nothing, when they are produced in a reaction they d…
False
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is this equation balanced or unbalanced? 2fe₂o₃ + 3c → 4fe + 3co₂
balanced
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what is the claim in the excerpt? by the 1920s, platinums increase in p…
Platinum’s growth in popularity led to its importance in chemical and electrical manufacturing.
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what is the central idea of this excerpt?platinum is only important whe…
Platinum's increase in popularity led to it's importance in the field of manufacturing.
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question 1 what chemical element is pb on the element table? salt chlor…
lead
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which of the following metal ions will repel an external magnetic field…
\(Zn^{2+}\)
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the very last report question is f2flab 2: density had you calculate a …
C. The subtraction rule results in the volume getting reported with one after the decimal. This results in a volume that is only 2 significant figures. The division for density di…
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question 46 (1 point) ✓ saved listen consider mixing an aqueous solutio…
\(Fe(OH)_{3}\)
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question 45 (1 point) listen which of the following ions would create a…
\(CO_3^{2-}\)
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which of the following is insoluble in water? cu(ch3coo)2 cucl2 cuso4 c…
$\text{Cu(OH)}_2$
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which type of reaction is the following? hclo₄(aq) + lioh(aq) → lioh(aq…
d) acid - base neutralization
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answer the following questions focusing on what you learned sodlab6: re…
12 mL
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question 36 (1 point) listen which of the following is not an example o…
Recording measurements for multiple reaction trials with the exact same time length for each reaction trial.
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determine the percent yield if the theoretical yield was calculated to …
B. 72.7%
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question 34 (1 point) consider the reaction: 3cucl2(aq) + 2al(s) → 3cu(…
\(1.84\ g\)
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question 33 (1 point) consider respiration, one of the most common chem…
\(C_{6}H_{12}O_{6}\)
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question 32 (1 point) if 100 g of h₂so₄ and 65 g of lioh are mixed, wha…
\(H_2SO_4\)
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question 31 (1 point) listen in a chemical reaction, the limiting reage…
E. The reactant that produces the least amount of product.
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select all options that are correct/valid for systematic error within a…
Miscalculation in the data analysis resulting in a high percent error, Reading a measurement improperly and therefore the recorded amount is not accurate.
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when 4.00 mol h₂ is mixed with 2.00 mol cl₂ how many moles of hcl can f…
\(4.00\ mol\ HCl\) (Option c)
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a chemical change takes place when milk goes bad. normally, bacteria in…
D. too much acid produced by bacteria
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sometimes you might not be able to see a new substance forming, so be o…
B. a chemical change might have occurred.
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question 29 (1 point) when 4.00 mol h₂ is mixed with 2.00 mol cl₂ how m…
a) \(2.00\ mol\ HCl\)
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chemical changes result in a new substance, but keep in mind that no ne…
B. to support the statement that no new atoms are created in a chemical change
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violet has noticed that shes been feeling sick around one of the chemic…
Yes
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why do people cook meat and eggs before they eat them? the answer has t…
D. Raw meat can be dangerous for people to eat.
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you already know that matter can be a pure substance or a mixture. and …
C. is a pure substance.
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matter consists of pure substances and mixtures. pure substances includ…
A. to describe how one mixture can be separated
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when a physical change occurs, a substances physical properties may cha…
A. What Kinds of Changes are Physical?
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before we discuss how substances change, lets talk about how we identif…
B. the atoms that make it up
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on a camping trip, marta roasts a marshmallow in the campfire. the mars…
A. a chemical change because the marshmallow changed in taste, color and smell
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question 28 (1 point) consider the reaction: 4fe(s) + 3o₂(g) → 2fe₂o₃(s…
C. \(4\space mol:2\space mol\)
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chapter 18 activity match the type of drug 1 - 5 with the action/use a …
1 - B, 2 - C, 3 - D, 4 - A, 5 - E
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4) why is the buret rinsed with sodium hydroxide solution prior to fill…
To prevent dilution of the sodium hydroxide solution by any residual water in the buret, ensuring the solution in the buret has the correct concentration for accurate experimental…
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question 27 (1 point) listen how many carbons are in the following mole…
d) 9
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a physical change can sometimes result in a color change. which of the …
C. A red candy dissolves and turns water pink
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question 26 (1 point) listen in the imf labs, you learned how to identi…
n - butylamine