化学
化学反応、化学量論、分子構造、元素の性質。
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9. the element copper has naturally occurring isotopes with mass number…
9. 63.55 amu 10. 79.90 amu
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masteryconnect wilson, makyla dtal - ch - term 1 - unit 2 assessment 25…
G
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which statement best describes the rhyme scheme of \a thought on the in…
There is a series of consecutive rhyming couplets.
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multiple choice identify the choice that best completes the statement o…
1. a. 2. d. 3. b. 4. c. Short Answer: 1. Particles are close together and can move past one another, taking the shape of the container while having a definite volume. 2. A process…
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physical and chemical properties and changes name test key physical pro…
5. C 6. C 7. P 8. P 9. C 10. P 11. P 12. P 13. P 14. C
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masteryconnect wilson, makyla dtal - ch - term 1 - unit 2 assessment 25…
the same number of protons but a different number of neutrons
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physical and chemical properties and changes name key physical property…
**Physical or Chemical Property** 1. P 2. P 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. P 12. P 13. P 14. C **Physical or Chemical Change** 1. P 2. C 3. C 4. P 5. C 6. C 7. P 8. …
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masteryconnect wilson, makyla dtal- ch- term 1 - unit 2 assessment 25-2…
2
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wilson, makyla dtal - ch - term 1 - unit 2 assessment 25 - 26 which of …
D. Mg²⁺
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57. correct the following statements. a. an element is a combination of…
a. Un elemento es una sustancia química pura que no se puede descomponer en sustancias más simples por métodos químicos comunes. b. Cuando un poco de azúcar se disuelve completame…
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1. nomenclature challenge: name the following lewis, condensed and line…
a. 1 - isopropyl - 4 - methylcyclooctane b. 4,5,7 - trimethyldodecane c. 3 - ethyl - 4 - methyl - 5 - propyloctane d. 2,2,6 - trimethylheptane e. 4 - methyldecane
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fill in the missing words the gas pressure of a mixture of oxygen, nitr…
58; 74.93; 17.04; 8.03
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select each process that shows a physical change. select all that apply…
A. Chopping Wood, C. Heating Water
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wilson, makyla dtal - ch - term 1 - unit 2 assessment 25 - 26 determine…
Protons: 11, Electrons: 10, Neutrons: 12
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in an experiment conducted by a student, 333 g h₂ reacts with 300.03 g …
The problem is incomplete as the actual yield is not provided. But the steps to calculate the percent yield are as above. First, find moles of reactants, then the limiting reactan…
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which of the following types of nuclear decay is represented by the equ…
C. alpha decay
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use the drop - down menus to label each of the following changes p for …
- The substance changes to a new substance: C - The original substance can be recovered: P - The color changes: C - Gas is produced and given off: C - The substance changes size, …
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10 multiple choice 1 point why is the solution cooled in an ice bath be…
To maximize crystallization of the product
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multiple choice 1 point neutral compounds remain in the organic solvent…
C. Are nonpolar and uncharged
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multiple choice 1 point why should no layers be discarded until the exp…
To avoid accidental disposal of the desired compound
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wilson, makyla dtal - ch - term 1 - unit 2 assessment 25 - 26 what is t…
27.98
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7 multiple choice 1 point anhydrous magnesium sulfate is added to: incr…
D. Absorb residual water from the organic solvent
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multiple choice 1 point which observations confirm that separation and …
Distinct melting points close to literature values for each compound
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5 multiple choice 1 point which reagent would convert an amine into a w…
A. HCl (aq)
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multiple choice point which base is strong enough to deprotonate phenol…
C. Sodium carbonate
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1. discuss the three main subatomic particles. where are they located w…
1. Protons are in the nucleus, have a relative mass of about 1 amu and a +1 charge. Neutrons are in the nucleus, have a relative mass of about 1 amu and a 0 charge. Electrons are …
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3 multiple choice 1 point during recrystallization, why is a mixed solv…
C. Naphthalene is soluble in hot methanol but poorly soluble in water
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2 multiple choice 1 point why must you vent the separatory funnel durin…
To release pressure from gas buildup
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multiple answer 1 point protonating an amine with hcl leads to which of…
A. Conversion to an ammonium chloride salt C. Increased solubility in water
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wilson, makyla dtal - ch - term 1 - unit 2 assessment 25 - 26 what does…
the mass number
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a geochemist examines a piece of metal that he found in the soil. he pe…
He is identifying the metal using physical properties only.
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to observe a property of a substance, the substance must interact with …
chemical
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which is an example of a chemical change? water evaporating from a pudd…
bread baking in an oven
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which term refers to a property that depends only on the amount of a su…
B. extensive
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which of these is a chemical property of a substance? texture ductility…
C. reactivity
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fill in the missing words if the gas pressure inside a 5.0 l container …
17
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which of these is an example of a physical change? sugar dissolving in …
sugar dissolving in warm water
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quiz 26:07 time remaining 50 multiple - choice 2 points determine wheth…
Without seeing the clear - cut structures of A, B and C in a non - blurry way, it's impossible to accurately determine the cis - trans isomerism. However, the general rule for cis…
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masteryconnect wilson, makyla dtal - ch - term 1 - unit 2 assessment 25…
the numbers of protons and electrons are equal
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which is an intensive property of a substance? density volume length ma…
A. density
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which of these is an example of a physical change? a banana ripening in…
D. liquid water turning into vapor
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1. balance each equation for a synthesis reaction. (a) k + o₂ → k₂o (b)…
(a) $4K+O_2 ightarrow 2K_2O$ (b) $P_4 + 10Cl_2 ightarrow 4PCl_5$ (c) $8Cu+S_8 ightarrow 8CuS$ (d) $2Mg + O_2 ightarrow 2MgO$ (e) $4Fe+3O_2 ightarrow 2Fe_2O_3$ (f) $2P_4+5S_8 ighta…
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multiple functional groups often exist in every bioactive compound that…
The image is not clear enough to accurately determine the correct option for labeling the functional - groups. However, if we assume the correct identification of functional group…
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wilson, makyla dtal: ch - term 1 - unit 2 assessment 25 - 26 rutherford…
a positive charge.
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1. use your periodic table to identify each element as a metal, metallo…
s based on periodic table properties, atomic structure, and subatomic particles.
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48 multiple choice 2 points which of the following statements is correc…
D. molecules with similar intermolecular forces will mix freely
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47 multiple choice 2 points clonazapam is used to treat seizures and pa…
C. 2
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multiple choice 2 points 2,3,4,5 - tetramethylheptane 2,2,5,5 - tetrame…
2,2,5,5 - tetramethylheptane
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the structures below are ______. structural isomers cis - trans isomers…
conformational isomers
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provide the name of the cycloalkanes shown below using cis - trans nome…
D. (i): trans - 1,2 - dibromocyclohexane; (ii): cis - 1,2 - dibromocyclohexane
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43 multiple choice 2 points the energy barrier for carbon - carbon bond…
D. torsion strain
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multiple choice—2 points. provide an acceptable iupac name for the alka…
A. 2,5 - dimethylheptane
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41 multiple choice 2 points based on dihedral angles and energy levels,…
C. Anti conformation
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multiple choice 2 points identify the marked dihedral angle in the give…
C. $0^{\circ}$
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39 multiple choice 2 points the formal charge on oxygen in dimethyl eth…
0
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t f 29 chipped or cracked glassware is okay to use. 30 read all procedu…
# Explicaciones Breves: - 29: El uso de cristalería dañada puede causar lesiones, entonces es falso. - 30: Leer cuidadosamente los procedimientos antes de entrar al laboratorio es…
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38 multiple choice 2 points provide an acceptable name for the alkane s…
3 - ethyl - 7 - methyl - 5 - propylnonane
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multiple choice 2 points which line angle drawing best represents the n…
To accurately answer this multiple - choice question, we need the specific options with labels (e.g., A, B, C, D). Since the options are not labeled, we cannot provide a specific …
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what is the mass percent of carbon in propanol, c3h8o? report your answ…
59.94% 3.51 g
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your answer may include the following changes. select each of the chang…
If considering physical changes: Heat the metal until it melts (physical change), Stretch the metal into a wire (physical change). If considering chemical changes: Attempt to reac…
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what is the molar mass of glucose, c6h12o6, in g/mol? answer to two dec…
Question 1: $180.18$ Question 2: $267.74$ Question 3: $11.90$
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true - false t f 22 hot glass looks the same as cold glass 23 all chemi…
# Explicaciones breves: 22. El vidrio caliente y frío puede parecer similar, pero el vidrio caliente puede ser peligroso de manipular sin saberlo, aunque visualmente a simple vist…
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35 multiple choice 2 points what is the major constituent of natural ga…
A. methane
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multiple choice 2 points a series of compounds, like the n - alkanes, t…
A. homologous
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multiple choice 2 points based on the structure below, what is the valu…
109°
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question 3. the diagram below shows the changes in the state of water (…
Process X is called deposition and process Y is called sublimation.
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multiple choice 2 points which of the following best describes the rela…
They represent different compounds that are constitutional isomers.
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31 multiple answer 2 points which statements about resonance are correc…
B. The true structure is a resonance hybrid, C. It involves the delocalization of electrons, D. All resonance forms must have the same number of unpaired electrons
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an industrial chemist is studying a sample of an unknown metal. describ…
- **Physical changes**: Measure density, Check malleability. - **Chemical changes**: React with acid, Expose to air for oxidation.
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multiple answer 2 points identify the functional groups in the structur…
amide: Yes, there is a -CONH - group which is an amide functional - group. aromatic hydrocarbon: Yes, there are benzene rings which are aromatic hydrocarbons. Ketone: No, there is…
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multiple choice 2 points how can you determine if two substituents on a…
C. By observing if they face the same or opposite directions on the molecule.
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question 23 (2 points) according to piaget, ________ is a concept or fr…
Question 23: C. schema Question 24: sensorimotor
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9 you are heating a piece of glass and now want to pick it up. you shou…
- 9. C. usar pinzas. - 10. C. decirle al instructor de ciencias inmediatamente. - 11. D. Todo lo anterior. - 12. D. Todo lo anterior. - 13. D. Ninguno de los anteriores.
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classify each of the following organic compounds and circle the functio…
a. Carboxylic Acid; Functional - group: $\ce{-COOH}$ (circle the $\ce{-COOH}$ part in $\ce{HCOOH}$) b. Amide; Functional - group: $\ce{-CONR_2}$ (circle the $\ce{-CON(CH_3)_2}$ pa…
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27 multiple answer 2 points which of the class of organic compound belo…
B. carboxylic acid, C. ester, D. aldehyde, E. ketone
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differentiating intensive and extensive properties the pictures to the …
Sample A melts at the same temperature as sample B. Sample B has more mass/volume than sample A. Sample A has less mass/volume than sample B. If sample A floats in water, sample B…
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26 multiple choice 2 points rank the molecules below from most to least…
A. A>C>B>D
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three - year - old henry tripped on an uneven sidewalk and ran crying t…
First question: animism Second question: Schemas
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multiple choice 2 points which of the following compounds has the highe…
The compound with two fluorine atoms (the second - option) has the highest acidity.
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question 18 (mandatory) (2 points) occurs when we incorporate new infor…
B. Assimilation/accommodation
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1. if a laboratory fire erupts, immediately a notify your instructor b …
1. A. notificar a tu instructor 2. A. notificar a tu instructor 3. D. cualquier momento en que se usen químicos, calor o cristalería 4. C. avisar a tu instructor de ciencias que l…
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2. if initially there is 38.0 mol/l of so₃(g), at equilibrium there is …
\(K_c\approx0.42\)
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79. iced tea use iced tea with and without ice cubes as examples to exp…
El té helado sin cubos de hielo es un mezclado homogéneo. El té helado con cubos de hielo es un mezclado heterogéneo. Cuando los cubos de hielo se derriten, queda un mezclado homo…
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the list below includes some of the properties of butane, a common fuel…
burns readily in air, boiling point of - 1.1°C, odorless, does not react with water
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multiple choice 2 points draw the appropriate structures and provide th…
1. Structure and IUPAC name: - Structure: A straight - chain of 7 carbon atoms (for n - heptane). IUPAC name: Heptane - Structure: A 6 - carbon chain with a methyl group on the 2n…
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23 multiple choice 2 points the synthetic steroid ru - 486 is shown bel…
10
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22 multiple choice 2 points which of the following condensed formulas c…
(CH₃)₂CC(CH₃)CO₂H
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the list below includes some of the properties of ammonia. identify the…
gas at room temperature, strong, unpleasant odor, dissolves easily in water
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multiple choice 2 points the formal charge on the nitrogen on the struc…
0
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multiple choice 2 points the formal charge on the nitrogen on the struc…
0
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multiple choice 2 points provide the name of the compound below. sec - …
D. sec - butylcyclohexane
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the list below includes some of the properties of ammonia. identify the…
gas at room temperature strong, unpleasant odor dissolves easily in water
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multiple choice 2 points how many carbons do the primary alkane constit…
A. $C_5 - C_8$
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78. seawater is composed of salt, sand, and water. is seawater a hetero…
Es una mezcla heterogénea.
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18 multiple choice 2 points shown below is one of the sex pheremones fr…
3
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calculate the mass in grams of each of the following: a) 1.38 moles of …
A. 19.33 g B. \(8.24\times 10^{9}\text{ g}\) C. \(3.19\times 10^{-8}\text{ g}\) D. \(1.20\times 10^{24}\text{ atoms}\) E. \(6.03\times 10^{23}\text{ atoms}\) F. \(3.01\times 10^{2…
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multiple choice 2 points sketch the chair conformations for the compoun…
In a cis - isomer, the two substituents are on the same side of the ring, and in a trans - isomer, the two substituents are on opposite sides of the ring. Looking at the given com…
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multiple choice 2 points what is the molecular formula for the followin…
C. $C_8H_{16}$
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multiple choice 2 points what is the name for the given cycloalkane as …
isobutylcyclohexane
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15 multiple choice 2 points what is the name for the given cycloalkane …
No correct option provided (missing structure details to determine).