化学
化学反応、化学量論、分子構造、元素の性質。
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8 multiple choice 1 point when comparing the electronegativity of potas…
The second option (Selenium is more electronegative. Potassium and selenium each have the same number of energy levels, however, selenium has more protons in its nucleus. A larger…
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question 10 of 10 which option is the basic unit of water, a compound? …
B. A water molecule
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when it reacts with another element, an oxygen atom gains two electrons…
C. An ion with a negative charge
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based on information from the periodic table, which statement is true f…
C. A cobalt atom contains 27 protons, and most cobalt atoms contain 32 neutrons.
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which is an example of a mixture? a. aluminum b. milk c. salt d. water
B. Milk
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most sodium atoms have an atomic mass of 23, but a few have atomic mass…
C. In the number of neutrons
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7 multiple choice 1 point identify the type of bond in which bonding el…
Ionic Bond
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which two mixtures are homogeneous? a. gasoline b. cereal in milk c. ap…
A. Gasoline, C. Apple juice
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3 multiple choice 1 point identify the predominate type of intermolecul…
Dipole - Dipole Interaction
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bellringer find the molar mass (mass of 1 mole) of the following atoms/…
- Al: $26.98\ \text{g/mol}$ - $CaSO_{3}$: $120.15\ \text{g/mol}$ - $C_{12}H_{22}O_{11}$: $342.296\ \text{g/mol}$
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most neutral atoms of argon have an atomic mass of 40 amu and an atomic…
A. 18 protons, 22 neutrons, and 18 electrons
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where is a neutron located within an atom? a. in the nucleus of the ato…
A. In the nucleus of the atom
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which type of matter is gold, an element used in making jewelry? a. a c…
B. A pure substance
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5. a cup of milk contains around 0.305 grams of calcium, how many moles…
$7.61\times 10^{-3}$ moles
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6. convert 15.8 moles of calcium to grams.
$633.264\ g$
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6. convert 15.8 moles of calcium to grams.
\(633.264\space g\)
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8. methane (ch₄) is one of the world’s leading greenhouse gases, and on…
\(7.11\times 10^{-4}\space mol\)
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7. dopamine (c₈h₁₁no₂) is a neurotransmitter associated with pleasure. …
\(0.0049\space mol\)
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8 fill in the blank 1 point cl₂ + nabr → choose your answer... choose y…
Br₂
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8 fill in the blank 1 point cl₂ + nabr → choose your answer... + nacl c…
Br₂ # Explanation: ## Step1: Analyze the reaction type This is a single - displacement reaction. ## Step2: Apply the reactivity series Chlorine (\(Cl_2\)) is more reactive than br…
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7 multiple choice 1 point complete the reaction: k(s) + h₂o(l) written …
B. \(H_2\) and \(KOH\)
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6 multiple choice 1 point complete the reaction: li(s) + ca(oh)₂(aq) → …
D. \( \text{Li(OH)} \)
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5 fill in the blank 1 point mg(s) + zn(so4)(aq) → zn(s) + choose your a…
\(Mg(SO_{4})\)
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3 fill in the blank 1 point use the activity series of metals to decide…
no reaction
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2 fill in the blank 1 point use the activity series of metals to decide…
reaction will occur
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which of the following equations represent a single replacement reactio…
\(Na(s)+HCl(l) ightarrow H_{2}(g)+NaCl(aq)\) and \(KBr(aq)+Cl_{2}(g) ightarrow KCl(aq)+Br_{2}(l)\)
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1. identify the binary compound(s) from the following list: . bas, nahc…
\(BaS\), \(KCl\), \(NaF\), \(Ca_3P_2\) ### 2. Formula Writing
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model 1: # 2 why is mass number always a whole number? * your answer th…
For the first question: The mass number is the sum of protons and neutrons, both of which are whole numbers. For the second question: B. C - 12
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hr matchup directions: identify which human resources management activi…
1. Training and development 2. Compensation and benefits 3. Compliance 4. Employee relations 5. Employee relations 6. Training and development
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student exploration: rock cycle vocabulary: deposition, erosion, extrus…
1. It cools and solidifies to form extrusive igneous rock. 2. Through weathering (physical and/or chemical processes that break rocks into smaller particles). 3. They will undergo…
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this bond holds polar charged molecules together based on weak electrom…
hydrogen bond
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2. pepto bismol and milk of magnesia are products that people can take …
2. Pepto Bismol and Milk of Magnesia are bases. They neutralize the excess stomach acid (usually hydrochloric acid) through a neutralization reaction (e.g., \(Mg(OH)_2 + 2HCl ight…
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what are the molecular and empirical chemical formulas of a compound ma…
empirical formula: \(C_3H_4O_4\) molecular formula: \(C_6H_8O_8\)
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this energy diagram shows the allowed energy levels of an electron in a…
- Which is the ground state? \(A\) - How many excited states are there? \(3\) - How many lines are in the absorption line spectrum? \(6\) - Which transition causes the emission li…
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which element has the electron configuration (1s^{2}2s^{2}2p^{6}3s^{2}3…
B. Ge
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4. write the atomic symbol (symbol notation) for the two isotopes of ur…
The atomic symbols are \(_{92}^{234}\text{U}\) and \(_{92}^{238}\text{U}\)
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this is a bohr model of an atom or ion. select the nuclear notation tha…
\( \boldsymbol{_{9}^{19}\text{F}} \) (the second option: \( \boldsymbol{_{9}^{19}\text{F}} \))
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which of the following series of isoelectronic ions (mg²⁺, n³⁻, f⁻, si⁴…
D. \(N^{3 -}>F^{-}>Mg^{2+}>Si^{4+}\)
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a solid compound in a sealed container was kept at a very low temperatu…
a covalent compound because it has a low melting point.
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which statement describes a property of covalent compounds? they have a…
They have a low boiling point because of weak intermolecular forces.
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use the reaction to answer the question. c₁₀h₈ + 12o₂ →? which products…
10CO2 + 4H2O
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part a on a mission to a newly discovered planet, an astronaut finds ch…
\(36.69\) amu
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use the reactivity series to answer the question. in a replacement reac…
Potassium, sodium, calcium, magnesium.
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combustion reactions release ______. (1 point) ○ oxygen and water ○ lig…
light, carbon dioxide, and water
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which option describes something that causes ionic bonds to form? (1 po…
large electronegativity differences
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what are isotopes? isotopes are different phases of built from the equi…
Isotopes are atoms of the same element that have different masses because they contain a different number of neutrons.
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part a the only known atom that does not contain a neutron is one of th…
1
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part a an isotope represented as s - 34: ○ must have exactly 18 electro…
contains exactly 18 neutrons.
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1. what nutrient deficiency is associated with dementia or dementia - l…
1. Vitamin B 2. Aspiration pneumonia 3. Identifying behaviors and their triggers 4. The person may talk less to avoid making mistakes 5. Delirium
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part a an isotope represented as s - 34: must have exactly 18 electrons…
none of the above
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part a how many protons are found in ne - 21? 10 0 11 21 none of the ab…
10
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what is the mass number of an ion with 108 electrons, 158 neutrons, and…
\(267\)
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is the surface quality that can be seen and felt. they can be rough or …
Tactile texture; Implied texture.
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in a chemical reaction, substance a transfers electrons to substance b.…
Substance A is oxidized and acts as the reducing agent.
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which component is transferred between substances in an oxygen - reduct…
electrons
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in the decomposition of water, why is twice as much hydrogen as oxygen …
There are two atoms of hydrogen and one atom of oxygen in a water molecule.
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in a synthesis reaction, two atoms of sodium (na) combine with one mole…
two
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which statement correctly describes the classification of chemical reac…
Not all reactions fit into one category, and some reactions can fit into more than one category.
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question 6 (mandatory) (10 points) listen the most serious complication…
Pulmonary embolism
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checkpoint 06 what is a vaccination? an injection of blood taken from a…
an injection of weakened bacteria that creates immunity to a disease
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grammar complete each conversation. what is the correct answer: a, b, o…
11. B. that one 12. A. The one 13. A. Which one 14. B. Which ones 15. A. that one
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covalent compounds can be represented by bohr model diagrams and lewis …
C. There are two bonding electrons in a chlorine molecule. D. A chlorine molecule has 14 total valence electrons.
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using the periodic table, identify the number of valence electrons in a…
| Element | Li | B | Cl | |--|--|--|--| | Number of valence electrons | 1 | 3 | 7 |
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9.000 g of compound x with molecular formula c4h8 are burned in a const…
\(-155\space kJ/mol\)
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classify each bond as covalent, ionic, or metallic according to its des…
- The type of bond formed between two nonmetal atoms: Covalent. - The type of bond that has a sea of moving electrons: Metallic. - The type of bond formed when electrons are trans…
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consider the lewis dot structures of potassium and bromine atoms. k ·br…
The first option \([K]^{+}[:\ddot{Br}:]^{-}\)
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1. $\\ce{\\_\\_\\_c_{8}h_{18} + \\_\\_\\_o_{2}\\to\\_\\_\\_co_{2} + \\_…
1. \(2C_8H_{18}+25O_2 = 16CO_2+18H_2O\) 2. \(CH_4 + 2O_2=CO_2+2H_2O\) 3. \(Pb(NO_3)_2+K_2CrO_4 = PbCrO_4+2KNO_3\) 4. \(KOH+HCl=KCl + H_2O\) 5. \(Pb(NO_3)_2+2KI = 2KNO_3+PbI_2\) 6.…
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phosphorus trifluoride (pf₃) is a covalent compound. the phosphorus ato…
The second Lewis dot structure (the one with \(:\ddot{F}-P-\ddot{F}:\) and a \(:\ddot{F}:\) below P) correctly represents a molecule of \(PF_3\).
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multiple - choice question what is a monomer? all the pieces together /…
A building block / one unit of a macromolecule
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multiple - choice question what is a monomer? all the pieces together /…
A building block / one unit of a macromolecule
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instructions: classify each of the following properties of matter as ph…
21. P 22. P 23. C 24. C 25. P 26. C 27. P 28. P 29. P 30. P 31. P 32. P 33. C 34. P 35. P 36. C 37. P 38. P 39. C 40. C 41. E 42. I 43. I 46. I 47. E 48. E
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1. what is the atomic symbol for each of the following elements: a. oxy…
1. - a. \(O\) - b. \(N\) - c. \(H\) - d. \(Na\) - e. \(Cl\) - f. \(K\) - g. \(Fe\) - h. \(S\) - i. \(Ca\) - j. \(C\) 2. - a. \(8\) - b. \(6\) - c. \(26\) 3. - a. \(14\) - b. \(32\…
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10.00 g of compound x with molecular formula c₄h₈ are burned in a const…
\(-160\space kJ/mol\)
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4. *the particle diagrams above represent a _____ change because _____.…
4. d. Physical; the sample retains its identity from the start to the end. 5. a. a compound
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prepwork: for each question below, use the annotation techniques practi…
1. d 2. b 3. d
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what is the change in heat of 11.2 grams of helium when its temperature…
-3610 joules This process is exothermic because heat is released by the helium as it cools.
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what is the change in heat of a 1.3 - gram block of sodium when its tem…
- 170 joules (rounded to two significant figures). This process is exothermic because heat is released by the sodium as it cools.
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chemistry resources the first ionization energy (ie₁) of an atom is the…
- When one potassium atom is supplied with \(419\space kJ\) of energy, it loses one electron. (False, it's per mole. \(419\space kJ\) is for one mole of \(K\) atoms to lose one mo…
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why do atoms of different elements have different ionization energies? …
The model with a \(10 +\) nucleus (charge \(q_1 = 10e\)) and the longest distance between the nucleus and the electron (model 4) has the weakest attractive force.
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scientists sometimes want to show whether more energy is used or releas…
glucose + oxygen → carbon dioxide + water + energy
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scenario: three students are writing about the topic of courage, but ea…
The short story might include made - up characters who show courage through their actions, the news article would share real - life examples or facts about courageous people, and …
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part 1: answer the following questions for an isotope with these featur…
1. - a) Yes - b) Protons determine the atomic number/element; Iron has 26 protons. Features: 26 protons. - c) Correct because the number of protons (26) is equal to iron's atomic …
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part 1: answer the following questions for an isotope with these featur…
Yes #### b)
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on a 12 - day wilderness expedition youll need to heat 3.0 kg of water …
\(5\)
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5.000 g of compound x with molecular formula c4h6 are burned in a const…
\(-2410\space kJ/mol\)
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5.000 g of compound x with molecular formula c4h6 are burned in a const…
\(23.4\space kJ/mol\)
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at a festival, spherical balloons with a radius of 140. cm are to be in…
\(111\)
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on a 10 day wilderness expedition youll need to heat 4.0 kg of water to…
\(4\)
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a student dissolves 11.1 g of potassium hydroxide (koh) in 300. g of wa…
- Is this reaction exothermic, endothermic, or neither? exothermic - If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or abso…
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a student dissolves 14.5 g of sodium hydroxide (naoh) in 200. g of wate…
- Is this reaction exothermic, endothermic, or neither? exothermic - If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or abso…
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the van der waals equation of state was designed (by dutch physicist jo…
- Van der Waals pressure: $67.1\ atm$ - Ideal Gas Law pressure: $80.8\ atm$
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use the van der waals equation to answer the questions in the table bel…
Units of \(a\): \(\frac{L^{2}\cdot atm}{mol^{2}}\) Units of \(b\): \(\frac{L}{mol}\) Pressure (van der Waals): \(44.4atm\) Pressure (Ideal Gas Law): \(53.1atm\)
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multiple choice 2 points what is the atomic number of the missing eleme…
The mass number of the missing element in the first reaction (related to the mass calculation) is \(139\).
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multiple choice 1 point what is the missing element in this equation. y…
Po
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20) xe i. write the full electron configuration, short - hand electron …
1. **Nitrogen**: - Full: \(1s^{2}2s^{2}2p^{3}\) - Short - hand: \([He]2s^{2}2p^{3}\) 2. **Chlorine**: - Full: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\) - Short - hand: \([Ne]3s^{2}3p^{5}…
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match each letter in the diagram with the correct label. nucleus electr…
A. Proton, B. Neutron, C. Nucleus, D. Electron
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8. indicate the trends for the following properties: atomic radius net …
- Atomic Radius: Increases down a group, decreases across a period. - Net Attractive Force: Increases across a period, decreases down a group. - 1st Ionization Energy: Decreases d…
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6. metallic character/reactivity a) define metallic character: b) metal…
a) The ability of an element to lose electrons and form positive ions. b) Decreases c) Increases d) Fr e) F f) Rb
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a) define first ionization energy b) first ionization energy from left …
a) The energy required to remove the outermost electron from a neutral atom in the gas phase. b) Increases c) Decreases d) F 5. a) The measure of an atom's ability to attract elec…
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3. ionic radius a) define ionic radius: b) ionic radius of a cation is …
a) The distance from the nucleus of an ion to the outermost electron in its electron cloud. b) smaller c) larger d) $Mg^{2+}$