化学
化学反応、化学量論、分子構造、元素の性質。
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7. what are produced when a base is mixed with water? a. hydrogen ions …
B. hydroxide ions
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consider the lewis structure below and answer the following five (5) qu…
- Hybridization of \(C_b\): \(sp^{3}\) - Hybridization of \(O_y\): \(sp^{3}\) - Ideal \(O - C_a - O_y\) bond angle: \(120^{\circ}\) - Ideal \(C_a - O_y - C_b\) bond angle: \(109^{…
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draw the most important lewis structure for the hocn molecule and then …
- OCN bond angle: \(180^{\circ}\) - \(\sigma\) and \(\pi\) bonds: three \(\sigma\) and two \(\pi\) - Valence bond description of the oxygen - carbon bond: \(\sigma(sp^{2}_{O}-sp_{…
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consider the following lewis structure for xeo3 and answer the followin…
1. \(109^{\circ}\) 2. trigonal pyramidal 3. Yes
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consider the following lewis structure for xeo₃ and answer the followin…
For the bond - angle question: \(109^{\circ}\) For the molecular geometry question: trigonal pyramidal
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for the structure below, numbers are included to differentiate the atom…
O - 3, C - 6
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use hesss law and the equations shown below to determine the enthalpy o…
\(-103.0\ kJ\)
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examine the following structure. determine the molecular formula for th…
\(x = 9\), \(y = 18\), \(z = 1\)
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consider the process below. 3fe₃o₄(s) + 8al(s) → 9fe(s) + 4al₂o₃(s) a. …
The amount of heat released is \(6.660\times 10^{6}\text{ kJ}\)
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which of the following are non - polar molecules? select all that apply…
BF₃, C₂H₂, XeF₄
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is the cf4 molecule polar? (c is the central atom and all of the fs are…
No
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2.1 the nature of matter 1. in the atom, which particles are in constan…
D. electrons
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3. hydrogen is a strange atom. while it has just one electron in its va…
The bond with length \(1.5\mathring{A}\) is a single bond and the bond with length \(1.2\mathring{A}\) is a triple bond.
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2. will two fluorine (f) atoms form a covalent or ionic bond? explain.
Two fluorine (F) atoms will form a covalent bond. Since both are non - metals, they share electrons (each F atom has 7 valence electrons, and by sharing one pair of electrons, the…
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this type of bond is much stronger than a single bond, but less stable;…
Lithium (Li) and oxygen (O) will form an ionic bond.
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name lewis structures worksheet total the valence electrons, then use l…
| Formula | Total Valence \(e^{-}\) | Lewis Structure | | ---- | ---- | ---- | | \(OCl_{2}\) | \(20\) | \(\ce{:\ddot{O} - Cl:}\) (with lone pairs) | | \(N_{2}\) | \(10\) | \(\ce{:…
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complete the balanced molecular reaction for the following weak base wi…
\(2NaClO(aq)+H_{2}SO_{4}(aq)\to 2HClO(aq)+Na_{2}SO_{4}(aq)\)
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7. multiple choice: which of the following household substances is most…
7. C. Baking soda 8. The pH of the solution decreases. 9. Baking soda. 10. The effect of an acid depends on its degree of dissociation (strong acids dissociate completely, weak ac…
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acids and bases - homework assignment name: selvin herrandur date: 11 -…
1. B. Turns blue litmus red 2. B. Accepts \(H^{+}\) ions 3. \(H^{+}\) (or \(H_{3}O^{+}\)) ion 4. \(OH^{-}\) ion 5. False
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adenine molecule nine the structural formula of adenine: what is the mo…
- Molecular formula of adenine: \(C_5H_5N_5\) - Molecular formula of phosphoric acid: \(H_3PO_4\) - Element in adenine not in carbohydrates: Nitrogen (\(N\)) - Element in ribose n…
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14. how is heavy water different from normal water? an oxygen atom in h…
A hydrogen atom in heavy water has an extra neutron.
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25. which grouping of circles, when considered in order from the top to…
(1)
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13. the electron cloud model describes the ____ of electrons in an atom…
B. likely locations
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24. which element forms a compound with chlorine with the general formu…
(1) \(Rb\)
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12. the nuclei of isotopes contain different numbers of electrons neutr…
neutrons
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11. given an elements atomic number and mass number, how can you tell t…
Number of protons = atomic number; number of neutrons = mass number - atomic number.
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10. magnesium combines with oxygen to form magnesium oxide. a 100 - gra…
In a particular compound, atoms of different elements always combine in the same way.
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9. who did not have experimental evidence to support his theory of the …
Democritus
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adenine molecule nine the structural formula of adenine: what is the mo…
Adenine: \(C_5H_5N_5\) Phosphoric acid: \(H_3PO_4\)
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6. rutherford proposed that atoms have positive nuclei. which statement…
Most of the mass of an atom is located in the nucleus.
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5. what is an atomic orbital? the orbit of an electron, much like a pla…
a region of space where an electron is likely to be found
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question 6 of 10 you eat a large meal and then hike up a hill. what kin…
D. Chemical energy to kinetic energy and gravitational potential energy
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2. an atom has 18 protons, 18 electrons, and 20 neutrons. this atom has…
a mass number of 38
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use the bond energy values in the table provided to calculate the \\( \…
\(-185\)
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question 28 which one of these molecules does not violate the octet rul…
\(NH_3\)
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determine the molar solubility for baco₃ by constructing an ice table, …
The molar solubility of \(BaCO_3\) is \(3.6\times 10^{-5}\ M\)
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9. in the ground state, an atom of each of the elements in group 2 has …
(3) number of valence electrons
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she became engrossed in the girls movements - a bobbled pass here, a mi…
Jillian's mother even teased her daughter about the military precision with which she performed everyday tasks such as making her bed and ironing her clothes.
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15. which of the following elements is an alkaline earth metal? a) sodi…
d. calcium
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kool - aid - powder, sugar, and water identify the solvent powder and s…
water
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a solution is a mixture. 6/10
homogeneous
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a supersaturated solution is one that... contains less solute than a sa…
The green - colored option (contains more solute than a saturated solution) is the correct description for a supersaturated solution.
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11. which of the following atoms is unlikely to form a stable ion by lo…
d. Cl
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which form of energy is being used by the toaster? a. chemical b. elect…
B. Electrical
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which form of energy is best shown in this picture? a. mechanical b. el…
A. Mechanical
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the energy used to move most bicycles is an example of what type of ene…
b. Mechanical
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18/20 you decided to make a snack mix. you add in nuts, raisins, pretze…
heterogeneous mixture
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find the relative clause. if it is nonrestrictive, set it off with comm…
During his tour of the organic chocolate factory, Samuel learned about the Theobroma cacao.
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determine the value of ksp for mg(cn)₂ by constructing an ice table, wr…
\(K_{sp}=\frac{[1.4\times 10^{-6}][2.8\times 10^{-6}]^2}{[0]} = 1.1\times 10^{-17}\)
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describe how does the temperature relate to density and the movement of…
A. As the air warms expanding its volume, decreasing its density, and the air molecules rise.
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definition the lowest energy state of an atom choose an answer 1 ground…
1. ground state
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groups 3 - 12, 1 - 2 electrons in the outer energy level, less reactive…
1. Transition metals
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definition 49 noble gases (group 18) choose an answer 1 most reactive m…
2. Least reactive elements
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answer the questions below to fill out the chart in the image, keeping …
Isotopes
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definition 4)alkali metals (group 1)choose an answer1 most reactive met…
1. Most reactive metals
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15. the atoms on either side are... isotopes same atom, not isotopes di…
15. Isotopes 16. Different element
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isotopes have the same number of protons (because they are the same ele…
13. Same atom, not isotopes 14. Different element
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dimethyl ether, a useful organic solvent, is prepared in two steps. in …
\(-254\)
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what is the stress pattern in iambic pentameter? ○ unstressed stressed …
- First question: unstressed stressed - Second question: the turn in direction or meaning in a sonnet
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construct the expression for ksp for solid ba₃(po₄)₂ in aqueous solutio…
\(K_{sp}=[Ba^{2 +}]^3[PO_4^{3 -}]^2\)
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which type of energy is released when a bond between atoms is broken? a…
A. Chemical energy
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which term describes energy stored in the bonds between atoms? a. chemi…
A. Chemical energy
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if you squeeze a foam pillow, what kind of energy are you increasing in…
C. Elastic energy
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which of the following is a form of mechanical energy? a. thermal energ…
B. Gravitational potential energy
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the table lists the specific heat capacities of select substances. an u…
silver
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titration example: what volume (in ml) of a 0.245 m h₂so₄ solution is r…
\(1580\space mL\)
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titration example: calculate the volume (in ml) of a 1.5 m naoh solutio…
$3\ \text{mL}$
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moles hcl = 0.005078 moles naoh × \\frac{1\\ mol\\ hcl}{1\\ mol\\ naoh}…
\(0.1016M\)
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when 1711 j of heat energy is added to 45.0 g of ethanol, c₂h₆o, the te…
\(113\space J/(mol\cdot^{\circ}C)\)
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titration example: you neutralize 50.00 ml of a hcl solution with 33.32…
The concentration of the \(HCl\) solution is \(0.1016\space M\)
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6. a. define: ground state and excited state. b. what happens when you …
- **A. Ground State**: The lowest energy state of an atom/molecule with electrons in lowest energy levels. **Excited State**: State with electrons in higher - energy orbitals due …
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given the reactions, x(s) + \\frac{1}{2}o_{2}(g) \\to xo(s) \\delta h =…
\(\Delta H=-1172.2\space kJ\)
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3. phosphoric acid can be prepared from elemental phosphorus, oxygen, a…
- **3. Balanced equations**: - \(P_4 + 5O_2=2P_2O_5\) - \(P_2O_5+3H_2O = 2H_3PO_4\) - Volume of \(H_3PO_4\approx3.36\space mL\) - **4. a. Balanced equation**: \(2KClO_3\xrightarro…
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at constant pressure, which of these systems do work on the surrounding…
A. \(A(s)+B(s)\to C(g)\), C. \(A(g)+B(g)\to 3C(g)\)
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definition 4 of 20 halogens (group 17) choose an answer least reactive …
Most reactive nonmetals
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explain how the total number of atoms are different from the total numb…
The number of elements in a compound is the count of different types of atoms (based on their proton - number/identity). The total number of atoms in a compound is the sum of all …
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if the heat of combustion for a specific compound is -1070.0 kj/mol and…
\(45.7\space g\)
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3. phosphoric acid can be prepared from elemental phosphorus, oxygen, a…
a. \(2KClO_3\stackrel{\Delta}{=\!=\!=}2KCl + 3O_2\uparrow\) b. \(1.44g\) c. \(83.9\%\)
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a subatomic particle that has no charge and that is found in the nucleu…
Neutron
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calculate the standard enthalpy change for the reaction at 25°c. standa…
\(-15.92\)
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given that $h_{2}(g)+f_{2}(g)\\to 2hf(g)$ $delta h_{r m}^{*}=-546.6 mat…
\(-521.6\space kJ\)
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which of the substances have a standard heat of formation (δhf°) of zer…
$O_{2}(g)$ at $25.0^{\circ}C$ and 1 atm
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because of the movement of water both above and below the ground. 1. af…
1. C. The concentration of the vinegar and water mix 2. A. Deltas help protect Florida’s coastline by slowing down floodwaters and soaking up rain during storms.
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the balanced combustion reaction for c₆h₆ is 2c₆h₆(l) + 15o₂(g) → 12co₂…
\(33.3\)
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consider the reaction 2h₂ + o₂ → 2h₂o δhᵣₓₙ = -484 kj which answer best…
411 kJ released
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explain how to count the number of atoms in a molecule that has parenth…
First, count the atoms within the parentheses. Then, multiply the number of each atom inside the parentheses by the sub - script number outside the parentheses.
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an 80.0 g sample of a gas was heated from 25 °c to 225 °c. during this …
$0.427\ J/(g\cdot^{\circ}C)$
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the specific heat of a certain type of cooking oil is 1.75 j/(g·°c). ho…
\(789100\)
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endothermic exothermic answer bank a chemical change takes place in a c…
- **Endothermic**: A "cold pack...the pack quickly begins to feel cold"; A chemical change takes place in a container, making it feel cold to the touch. - **Exothermic**: A chemic…
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multiple - choice question what is work? the movement of atoms and mole…
C. None of the above
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explain how to count the number of elements in a compound.
Count the distinct capital - letter - starting groups in the compound's chemical formula.
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4 which of the following is a true statement. a water breaking apart ro…
- **Question 4**: A. Water breaking apart rocks by freezing and thawing is an example of physical weathering. - **Question 5**: D. The peaks and columns are made of rock that are …
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multiple choice write the letter of the correct answer on the line at t…
24. B 25. D 26. B
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a mixture of he, n₂, and ar has a pressure of 17.2 atm at 28.0°c. if th…
\(11.2\ atm\)
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which is a postulate of the kinetic molecular theory of gases? despite …
The particles that compose a gas are so small compared to the distances between them that the volume of the individual particles can be assumed to be negligible.
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general chemistry 4th edition mcquarrie · rock · gallogly university sc…
\(0.774\ g\)
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suppose 1.535 g of copper(ii) sulfate is dissolved in water and allowed…
B. \(Cu^{2+}\)
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the combustion of octane, c₈h₁₈, proceeds according to the reaction sho…
\(80934\space L\)
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a 9.45 l container holds a mixture of two gases at 37°c. the partial pr…
\(1.41\) atm
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23. all solids, liquids, and gases are the 3 common states of _, becaus…
matter