Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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question 1 of 22 in the given depiction of a substance, each sphere rep…
chemical formula: $Cl_2$ state of matter: gas
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which would most likely form a homogeneous mixture? 10 marbles mixed wi…
a pinch of sugar mixed with a cup of water
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hana fills a cup with sandy ocean water. she pours the mixture through …
B. a solution of salt in water
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dominic made the table below to organize his notes about mixtures. prop…
Although it is possible to have more than one state, it is also possible to have only one state.
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which is a property of every mixture? one substance dissolves in anothe…
One substance can be separated from another through physical means.
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a group of scientists is researching a substance that improves the safe…
Research conditions in which hydrogen can be stored in a liquid
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lars is balancing equations with his study group. he is unsure about on…
B. $3Ca(OH)_2 + 2H_3PO_4 ightarrow Ca_3(PO_4)_2+6H_2O$
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2. write a balanced chemical equation to represent each reaction descri…
(a) $4Al + 3O_2=2Al_2O_3$ (b) $Zn + S = ZnS$
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when balanced, which equation would have the coefficient 3 in front of …
$H_{2}SO_{4}+B(OH)_{3} ightarrow B_{2}(SO_{4})_{3}+H_{2}O$
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do now 1. classify the changes involved in the following processes as p…
(a) C (b) P (c) C (d) P (e) C
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how is energy related to the change of state represented by the model? …
Atoms gain energy as a solid changes to a gas
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the equation for water is h₂ + o₂ → h₂o. to balance the equation, which…
B. 2
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marco wants to investigate the chemical properties of sodium bicarbonat…
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
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during which changes of state do atoms that cannot move past one anothe…
C. sublimation and melting
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read the passage and the thesaurus entry. from how sammy went to coral …
4. The Hermit is hiding his true intentions from Sammy.
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two sources discuss the source of natural and synthetic emeralds. sourc…
less environmental and health - related
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chapter 11: skill - builder due sep 14 by 11:59pm points 10 submitting …
134.4
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what happens to the total mass of a substance undergoing a physical cha…
It stays the same.
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according to the lab guide, which changes below will you look for in or…
changes in shape or size, color changes, whether changes are easily reversible, temperature changes, formation of precipitates or gases, changes of state (gas, liquid, or solid)
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2. write a balanced chemical equation to represent each reaction descri…
(a) $3Ag + Au(NO_3)_3=3AgNO_3 + Au$ (b) $Cu + PbSO_4=CuSO_4 + Pb$
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which property of physical changes explains why matter is conserved in …
The bonds between atoms do not break; it is only the arrangement that changes.
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an amount of nitrogen undergoes a physical change and increases its vol…
The density changed.
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which example illustrates a chemical change? shredding paper smashing a…
burning wood
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comparing relationships in a table acidity changes after dry ice is add…
The pH of solution A decreases, and the pH of solution B decreases.
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which ranks these materials by the attraction between their atoms from …
A. oxygen gas, liquid water, liquid honey, solid iron ore
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hypothesis: if a material undergoes a chemical change, then it will not…
properties before the chemical - change; properties after the chemical - change
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2. write a balanced chemical equation to represent each reaction descri…
(a) $3Ag + Au(NO_3)_3=3AgNO_3 + Au$ (b) $Cu + PbSO_4=CuSO_4 + Pb$
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question 1 - 2 hydrogen bonding is responsible for unique properties of…
C. A hydrogen bond forms between the oxygen atom of one water molecule and a hydrogen atom of a different water molecule
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question 10 1 pts your professor announces that you will have a guest s…
schemas
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two sources discuss the source of natural and synthetic emeralds. sourc…
a positive
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question 6 1 pts rigid schema help increase self - esteem. true false
False
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an atom contains 70 protons, 70 electrons, and 99 neutrons. what is the…
169
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a. which type of matter can the magnetic filings be classified as? expl…
a. Solid; they have definite shape and volume and are made of closely - packed particles. b. From the start when sand and magnetic filings were combined; it is a combination of su…
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3. a. for cyclohexane, explain how chair conformations and axial/equato…
a. In cyclohexane's chair - conformation, axial substituents can cause 1,3 - diaxial interactions leading to steric strain, while equatorial substituents have less steric hindranc…
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which of these elements has the smallest atomic number? zr (zirconium) …
Mn (manganese) H, Sb, Tc, C
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an isotope is different versions of the same element with a different n…
C. Neutrons
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how would you describe the nucleus? dense and positively charged tiny a…
Dense and positively charged, Neutrons
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use the chart below to identify atoms, ions, and isotopes. which elemen…
Which element is an ion with a +1 charge? Lithium Which element is an ion with a -2 charge? Sulfur Which element is a neutral atom? Potassium Which element is an ion with a -1 cha…
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two examples of energy transformations are shown. the energy transforma…
result in radiant energy
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which symbol below correctly identifies an element with 16 protons, 18 …
d. \(_{16}^{34}S^{-2}\)
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question 4 multiple choice worth 4 points which piece of laboratory equ…
C. Mortar and pestle
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1. balance each equation for a single replacement reaction. (a) k + h₃p…
(a) $6K + 2H_3PO_4 ightarrow 2K_3PO_4+3H_2$ (b) $2Fe + 3H_2S ightarrow Fe_2S_3 + 3H_2$ (c) $Cl_2+MgBr_2 ightarrow MgCl_2 + Br_2$ (d) $Cu+Ag_2CO_3 ightarrow CuCO_3 + 2Ag$ (e) $Br_2…
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this lab question is: how can you distinguish a physical change from a …
All of the statements are appropriate hypotheses. 1. If a substance changes state of matter (e.g., liquid to gas), then this is a physical change because original properties of th…
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76. which of the following are the same and which are different? a. a s…
a. Son lo mismo. b. Son diferentes. c. Son diferentes. d. Son lo mismo.
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how can you distinguish a from b? in this lab, you will do experiments …
How can you distinguish a physical change from a chemical change?
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question 3 (multiple choice worth 4 points) (01.04r mc) the table compa…
It is a gas because the particles of the substance have the highest speeds.
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question 2 (multiple choice worth 4 points) (01.03 mc) emma used an equ…
1.1 g
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58. name the elements contained in the following compounds. a. sodium c…
a. Sodio (Na), Cloro (Cl) b. Nitrógeno (N), Hidrógeno (H) c. Carbono (C), Hidrógeno (H), Oxígeno (O) d. Bromo (Br)
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newman projection analysis: draw a newman projection along the c3 - c4 …
a. Newman projection: Draw a dot for C3 with its attached groups (hydroxyl and alkyl) and a circle for C4 with its attached groups (hydroxyl and alkyl) arranged according to their…
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dimensional analysis (unit factor method) using this method, it is poss…
1. 10800 2. 0.0035 3. 12.128 4. 90 5. 11388 6. $1.806\times 10^{24}$ 7. 4.153 8. 112 9. 4.464 10. $1.344\times10^{24}$ 11. 186.054 12. 7.5
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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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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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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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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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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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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