Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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part iv: review exercises 1. the periodic table has a great deal of inf…
1. A. 17 B. 17 C. 74 2. | Name | Symbol | Atomic number | Mass Number | Number of neutrons | Number of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | hydrogen - 2 | $^{…
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determine the molecular formula and calculate the molar mass (in g/mol)…
Molecular formula: $C_6H_{14}N_4O_2$, molar mass: 174.24 g/mol
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part iii: isotopes 1. play with the simulation to determine: a. which p…
1. a. Protons and neutrons b. Electrons 2. Oxygen - 16, Oxygen - 17, Oxygen - 18 3. Number of protons (atomic number = 8) 4. Number of neutrons 5. Same atomic number, different ma…
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phet -building an atom part i: atom screen 1. go to the website: phet.c…
3. Protons and neutrons 4. Protons 5. a. Lithium b. Helium c. Beryllium 6. Protons and electrons 7. a. same number b. more c. less 8. Charge = Number of protons - Number of electr…
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54. calculate what is the mass, in kilograms, of 14.0 l of gasoline? (a…
$9.52\ kg$
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a 14.4 ml sample of vinegar, containing acetic acid, was titrated using…
$0.767\ M$
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53. calculate make the following conversions. express your answers in s…
a. $1.48\times 10^{7}\ \mu g$ b. $3.72\times 10^{-3}\ kg$ c. $6.63\times 10^{4}\ cm^{3}$ d. $7.5\times 10^{1}\ kJ$ e. $3.9\times 10^{3}\ dg$ f. $2.1\times 10^{1}\ \mu L$
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since molarity is defined by the equation $m=\frac{mol_{solute}}{l_{sol…
C. 0.156 mol
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to begin to solve this problem, one must first recall the equation for …
$M=\frac{\text{mol}_{\text{solute}}}{L_{\text{solution}}}$ (the fourth - option)
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46. the radius of a potassium atom is 0.227 nm. express this radius in …
$2.27\times 10^{-8}\ cm$
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43. use dimensional analysis and the given densities to make the follow…
a. $6.32\ cm^{3}$ b. $0.342\ cm^{3}$
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question 7 1 pts which of the following forms hydration shells? sodium …
- Question 7: sodium chloride - Question 8: 1
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what type of bond is this? covalent ionic hydrogen
B. Ionic
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which of these covalent bonds is polar, based on the electronegativity …
C - N
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which is the name of an important chemical bond in biology? phosphotidy…
Question 1: covalent Question 2: nitrogen
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what aspect of water is the source of cohesion? acidity small size part…
Question 1: partial charge Question 2: C - O
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construct an explanation based on the data you gathered from the flame …
The metal is identified based on the characteristic flame - test color match with the gathered data. The data supports the finding as each metal has a unique flame - test color wh…
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draw conclusions write a conclusion that addresses each of the points b…
Claim: A flame test can be used to identify different metal elements because each metal has a characteristic emission spectrum due to its unique electron - configuration. When the…
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during the setup, hands - on, and takedown segments of the activity, we…
1. Differences may be due to wire cleanliness, solution amount on wire, or flame temperature variations. 2. Use precise solution application, thorough wire cleaning, and a stable …
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inquiry warm - up: it’s raining, it’s pouring directions 1. with your g…
A raindrop falls on land. It can either seep into the ground (infiltration) and become groundwater, or flow over the surface as runoff into rivers, which then carry it to the ocea…
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identifying a flame test your company has been contacted by jayden and …
1. Different metals have distinct electron - shell structures. When heated, electrons jump to higher energy levels and emit light of specific wavelengths when returning, creating …
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the nuclear model of the atom was an improvement over previous models, …
Different metals produce different flame colors because each metal has a unique electron - configuration. When heated, electrons in the metal atoms move to higher energy levels an…
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7) potassium + bromine formula: name: 8) potassium + oxygen formula: na…
7) Formula: $KBr$, Name: Potassium bromide 8) Formula: $K_2O$, Name: Potassium oxide 9) Formula: $Na_2O$, Name: Sodium oxide 10) Formula: $AlCl_3$, Name: Aluminum chloride 11) For…
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directions: for each of the following elements, draw lewis dot diagrams…
1) Formula: $NaCl$, Name: Sodium chloride 2) Formula: $KI$, Name: Potassium iodide 3) Formula: $MgO$, Name: Magnesium oxide 4) Formula: $CaS$, Name: Calcium sulfide 5) Formula: $C…
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acrylonitrile, an important starting material for the manufacture of pl…
$-1554$ kJ
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12) use your knowledge of the kinetic molecular theory to explain the f…
(a) Molecules are closely packed and vibrate around fixed positions. (b) Molecules can slide past one another. (c) Water molecules lose kinetic energy and arrange in a regular pat…
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module 1 lesson 3 - sept 15 1. the chemical formula for water is 2. wat…
1. $H_2O$ 2. polar
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fill in the blank: structure a is a(n) fat and will be at room temperat…
Structure A is a(n) saturated fat and will be solid at room temperature. Structure B is a(n) unsaturated fat because it contains a double bond and will be liquid at room temperatu…
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the scattering of sunlight by the mixture of gas molecules in the air r…
$4.97\times 10^{-19}\text{ J}$ (rounded to three significant figures)
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to fix this problem, officials devised a plan to divide the earths surf…
1. Officials devised a plan to divide the earth's surface into 24 time zones, one for each hour of the day, and the US has four (Eastern, Central, Mountain, Pacific). 2. Positive …
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valence electrons practice the valence electrons are the electrons in t…
1. 7 2. 1 3. 5 4. 1 5. 2 6. 4 7. 5 8. 7 9. 4 10. 6 11. 8 12. 2 13. 1 14. 3 15. 2 16. 1 17. 2 18. 8 19. 6 20. 3 21. 7 22. Used for chemical bonding to achieve stable electron confi…
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question 14 (6.67 points) listen twin studies suggest that alzheimers d…
3) heredity.
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people have always responded so positively to alyssas good looks that s…
3) the interaction of nature and nurture.
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5. reflect on the broader implications of stoichiometry and percent yie…
Stoichiometry and percent - yield calculations are crucial for accurate prediction, efficiency improvement, and advancement in scientific research and industrial practices in chem…
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4. compare the use of stoichiometry principles in theoretical calculati…
In theoretical calculations, stoichiometry relies on ideal conditions and balanced equations for precise molar - ratio based predictions. In practical applications, real - world f…
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question #12 you can separate the particles that make up sugar from the…
- Question #12: C. soluble in water - Question #13: A. $D = m/V$ - Question #14: True
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question #9 a physical property is a characteristic of matter that can …
- Question #9: A. A new substance with new properties forms when iron rusts. - Question #10: B. Metals - Question #11: A. Weak Conductors/ Semi - conductors
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graphing and analysis using a spreadsheet program (like excel or google…
The slope $m$ and y - intercept $b$ are obtained from the trend - line equation in the spreadsheet. The concentration of the unknown $CuSO_{4}$ solution is calculated as $x=\frac{…
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question #6 a student mixes two substances and observes a rise in tempe…
- Question #6: B. A chemical reaction occurred because a new substance was formed. - Question #7: B. gas bubbles appear, E. changes in temperature - Question #8: B. The mixture be…
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table 1: standard solution preparation and absorbance data calculate th…
| Standard | Concentration (M) | | ---- | ---- | | Standard 1 | 0.08 | | Standard 2 | 0.16 | | Standard 3 | 0.24 | | Standard 4 | 0.32 | | Standard 5 | 0.40 |
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question #3 a student adds 100 ml of water to three similar containers …
Question #3: C. Container 1 is made of a nonmetal, and containers 2 and 3 are made of metals because the chemical properties of those containers change Question #4: C. A physical …
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question #1 which is an example of a chemical property of matter? a col…
Question #1: C. reactivity Question #2: C. Properties of the mixture (color, density, magnetism) are changed.
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suppose that your chemistry and economics professors have decided to gi…
| Hours of Study on Economics | Hours of Study on Chemistry | Expected Grade in Economics | Expected Grade in Chemistry | |---|---|---|---| | 12 | 0 | A | F | | 9 | 3 | B | D | | …
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as part of a research experiment, a chemist is weighing 7 samples. the …
$5.6$
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select all the correct answers. which two of these characteristics are …
Both originated from the oral poetic tradition. Both contain the elements of a narrative.
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3. discuss the significance of percent yield calculations in chemistry.…
Percent - yield calculations are significant as they allow chemists to measure the efficiency of chemical reactions and processes by comparing actual and theoretical yields, which…
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10. study questions and problems #10 suppose that your chemistry and ec…
| Hours of Study on Economics | Hours of Study on Chemistry | Expected Grade in Economics | Expected Grade in Chemistry | |---|---|---|---| | 12 | 0 | A | F | | 9 | 3 | B | D | | …
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a student notices that food coloring spreads out faster in warm water t…
Particles in warm water move faster than in cold water.
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select the correct answer. what is blank verse form? a. it is a type of…
C. It is a type of verse with no rhyme scheme but a meter in iambic pentameter.
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select the correct answer. which of the following correctly defines epi…
C. It is a long narrative often focused on mythological events.
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how can testing conductivity help us identify a pure substance?
Testing conductivity helps identify a pure substance by comparing the measured conductivity value to the known conductivity ranges of different pure substances, as different pure …
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how can testing conductivity help us identify a pure substance?
Testing conductivity can help identify a pure substance by comparing the measured conductivity value to known values for different pure substances, as the conductivity is related …
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a balloon filled with hydrogen gas (h₂) has a volume of 4.911 liters. s…
2.831 atm
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a sample of nitrogen gas (n₂) occupies a volume of 0.0333 cubic meters …
$0.0868$ cubic meters
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a sample of carbon dioxide gas (co₂) at an initial pressure of 2.07 × 1…
7.53
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a balloon filled with neon gas (ne) has an internal pressure of 1.145 b…
$4088$ mL
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a balloon filled with nitrous oxide gas (n₂o) has a volume of 7.11 lite…
17.6 psi
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a sample of nitrous oxide (n₂o) at a pressure of 5.9 atmospheres (atm) …
1.9 liters
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a balloon filled with hydrogen gas (h₂) has an internal pressure of 1.2…
$5.76\times 10^{-3}$ m³ (rounded to three significant figures)
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a balloon filled with hydrogen gas (h₂) has an internal pressure of 1.2…
$5.764\times 10^{-3}$
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a sealed syringe contains 37.55 milliliters of oxygen gas (o₂) at a pre…
1.043 bar
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a sample of oxygen gas (o₂) is transferred from a 30.00 - liter tank to…
18.37 atm
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classify each mixture as homogeneous or heterogeneous. drag the appropr…
Heterogeneous: chocolate sundae Homogeneous: coffee, apple juice, gasoline
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a sample of argon gas (ar) at an initial pressure of 772 kilopascals (k…
$0.0129$ cubic meters
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a sample of argon gas (ar) at an initial pressure of 772 kilopascals (k…
$0.0129$ cubic meters
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a sealed syringe contains 15.3 cubic centimeters of carbon dioxide gas …
16.3
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a sealed syringe contains neon gas (ne) at a pressure of 5.51 atmospher…
0.037 liters
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a sample of nitrogen gas (n₂) is transferred from a cylinder with a vol…
2.44 atm
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which of the following properties of ethylene (a ripening agent for ban…
Physical: 1 L has a mass of 1.260 g under standard conditions, odorless, gas at room temperature, mixes with acetone Chemical: polymerizes to form polyethylene, flammable
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a 10.0 - liter sample of oxygen gas (o₂) is compressed inside a rigid c…
$1.8$ bar
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when carbon is burned in air, it reacts with oxygen to form carbon diox…
$70.4\ g$
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a sample of chlorine gas (cl₂) at a pressure of 1.685 × 10⁴ torr is tra…
16.34
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a sealed syringe contains oxygen gas (o₂) at a pressure of 115.0 kilopa…
53
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why is density a useful way to identify a substance?
Density is a characteristic property of a substance, and different substances have distinct densities under specific conditions, allowing for identification.
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a sealed syringe contains 47.32 milliliters of helium gas (he) at a pre…
$36.7$
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13 compare and contrast how does an elements atomic mass differ from it…
The mass number is a whole number representing the sum of protons and neutrons in a specific isotope's nucleus. Atomic mass is a weighted average value that considers the masses a…
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a sample of chlorine gas (cl₂) is transferred from a 5.00 - liter cylin…
13.5 psi
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a balloon filled with carbon dioxide gas (co₂) has a volume of 0.0045 c…
$0.98$ bar
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11 compare in what ways are final grade calculations and atomic mass ca…
Both are weighted - average calculations.
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sep analyze data look at the graphs. how does an elements atomic mass c…
The atomic mass of an element is usually close to the mass number of its most abundant isotope, but not exactly the same due to the contributions of other less - abundant isotopes.
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which property helps us know if a substance can dissolve in water?
Solubility
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7 sep communicate information how does the overall charge of oxygen - 1…
The overall charge of oxygen - 16, oxygen - 17, and oxygen - 18 is the same (0), because they are isotopes of oxygen and have the same number of protons and electrons.
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sensorimotor play is best defined as behavior engaged in by infants to …
infants to derive pleasure from exercising their sensorimotor schemes.
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which description best describes a mixture? mad up of 2 or more differe…
A. made up of 2 or more different types of substances that are not chemically bonded
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think about it: what is a “property” of a substance? a property is ____…
a characteristic or quality of a substance that can be used to identify or describe it.
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26/40 h₂o is a... ionic compound covalent compound mixture element
B. Covalent Compound
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2 c₂h₆ + o₂ → 4 co₂ + 6 h₂o in the equation above, how you would catego…
C. It's a coefficient
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what qualifies a substance to be considered a molecule? there need only…
There must be more than one atom (same or different) bonded together.
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you have unlimited attempts on this assignment. questions are pulled fr…
Releases energy
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true or false: monoatomic elements are pure substances when they are no…
TRUE
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true or false: monoatomic elements are pure substances when they are no…
TRUE
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one of relatively few reactions that takes place directly between two s…
Ba(OH)$_2\cdot$8H$_2$O(s)+2NH$_4$SCN(s)$ ightarrow$Ba(SCN)$_2$(s)+10H$_2$O(l)+2NH$_3$(g)
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infer based on the organization and colors in the periodic table, which…
Magnesium (Mg) and barium (Ba) are most similar in terms of their properties because they are in the same group (Group 2) of the periodic table and have similar outer - electron c…
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2 c₂h₆ + o₂ → 4 co₂ + 6 h₂o how many molecules of water are there on th…
6
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true or false: nacl is a molecule.
FALSE
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what type of mixture is this? mixture of diatomic/elemental molecules a…
C. Mixture of monoatomic elements and diatomic/elemental molecules
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measuring volume 8. 9. 10.
8. 45 mL 9. 3.5 mL 10. 28 mL
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true or false: n₂ is a molecule.
TRUE
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physical and chemical changes instructions: a physical change can be de…
Physical Change: a salt dissolves in water, copper metal conducts an electrical current, ice melting, sublimation of dry ice Chemical Change: a gas explodes in the air, a raw egg …
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so, what is an atom. simply put, its the basic unit of a chemical eleme…
An atom is the basic unit of a chemical element.