Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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what term describes the substance of smaller amount, the one being diss…
solute
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what term describes a solution where a solid dissolves in a liquid? sol…
A. soluble
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2n₂(g) + 5o₂(g) → 2n₂o₅(g) if 3.22 moles of n₂ react, what volume of n₂…
\(72.1\) (or \(72.128\)) L
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how many moles of nitrogen are contained in 18.7 l at stp? ? mol
\( \approx0.835 \)
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a cylinder with a moveable piston contains a gas at 512 mm hg and 311 k…
The new temperature of the cylinder is approximately $439\space K$
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question 7 7. which physical property helps separate the raisins out of…
A. Hand separation
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at stp, how many moles of h₂ gas are contained within a 112 l container?
5 moles
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a sealed vessel containing argon, oxygen, and nitrogen has a total pres…
The partial pressure of argon is $\boldsymbol{1.20}$ atm.
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what mass of al is needed to react with 16 g o₂? 4al + 3o₂ → 2al₂o₃ (16…
18 g Al (corresponding to the middle option: 18 g Al)
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4al + 3o₂ → 2al₂o₃ what conversion factor is missing from the dimension…
$\frac{27\ \text{g Al}}{1\ \text{mol Al}}$ (the middle option: $\frac{27\ \text{g Al}}{1\ \text{mol Al}}$)
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we want to find out how many grams of al are needed to react with 16 g …
A. g Al
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highlight any word(s) that make up the verb. dr. doofenshmirtz and the …
had
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c + 2f₂ → cf₄ 6.0 mol f₂ are needed during the reaction. what is the ma…
\( 228 \)
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c + 2f₂ → cf₄ how many moles f₂ are needed to generate 3.0 moles cf₄? ?…
\( 6.0 \)
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how many moles of co₂ are produced if 6.0 moles o₂ are used? c₆h₁₂o₆ + …
6.0
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c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the ratio between ethanol …
1
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final exam c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the ratio betwe…
1
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what is the percent o in n₂o? (n = 14.01 g/mol, o = 16.00 g/mol) ? % o
36.35%
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what does point g on the phase diagram represent? chart: pressure (atm)…
normal boiling point
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what state of matter is a sample at 2.2 atm and 41 °c? pressure (atm) 0…
solid
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solid, liquid, and gas coexist at point e. what does this point on the …
triple point
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which term describes the process by which gas molecules aggregate to fo…
A. condensation
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which term describes the process by which a gas goes directly to the so…
deposition
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which of these is a property of a metallic solid? dull luster held toge…
malleable
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which of the following is not a property of most network solids (exclud…
conducts electricity
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a solid is held together with intermolecular forces and has a dull appe…
molecular
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evaporation rate various compounds the data below shows the change in t…
D. compound D
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evaporation rate various compounds the data below shows the change in t…
The molecules have different amounts of dispersion forces.
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based on the strength of their intermolecular forces, how does the boil…
CH₄ has a lower boiling point than CH₃CH₂CH₃.
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what liquid property is defined as the spontaneous flow of a liquid int…
capillary action
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which liquid would have the highest volatility (ability to move from li…
CH₄ (Dispersion)
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what intermolecular forces does ch₃ch₂ch₃ exhibit with similar molecule…
only dispersion forces
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what is the dominant intermolecular force found between hydrogen iodide…
dipole-dipole forces
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what intermolecular forces can hcl exhibit with similar molecules? only…
only dispersion and dipole-dipole forces
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what type of connecting force is short - lived and influences the state…
intermolecular force
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what type of attractive force is the arrow pointing at in the molecule?…
intermolecular force
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what type of connecting force is permanent until the molecules go throu…
intramolecular force
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directions: using the following terms or phrases, complete the concept …
The concept map is filled with the following terms (from top to bottom, left to right): - Top box: Waves - "are produced by": Vibrating Molecules - "are": Repeating Disturbance - …
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read the following line from chapter 8 of frankenstein. i will melt the…
figurative language
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assessment lesson 1 temperature, thermal energy, and heat 1. what is th…
1. B. thermal energy 2. Celsius scale 3. Heat flows from your hand to the ice cube. 4. A and B have the same average particle motion (same temperature); C has faster average motio…
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10. a bottle of cola has h⁺ = 6.3 × 10⁻⁴ m. what is its ph, and is it m…
10. pH≈3.2, more acidic than coffee 11. Factor≈2 12. ~32 times greater 13. pH≈12.2, similar to ammonia strength
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25. wind energy is considered renewable because: a. it can be stored fo…
1. F 2. E 3. B 4. A 5. C 6. D 7. G 8. H 9. I 10. J 11. K 12. L 13. M 14. N 15. O
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16. water freezing into ice shows: a. mass loss b. matter conserved c. …
16. b. Matter conserved 17. b. Ancient plants and animals 18. a. Conservation of matter 19. c. Chemical change 20. c. Replace themselves naturally 21. b. Iron rusting 22. c. Coal …
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15. in the reaction below, label the acid, base, conjugate acid, and co…
- $\ce{HCl}$ is the acid - $\ce{H2O}$ is the base - $\ce{Cl-}$ is the conjugate base - $\ce{H3O+}$ is the conjugate acid
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14. an acid with a ph of 2.0 has about how many more h+ ions as an acid…
1000 times more
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circle the correct answer. 1. the law of conservation of matter states …
1. b. Mass stays the same before and after a reaction 2. c. Melting ice 3. d. Digesting food 4. b. Change in color or temperature 5. c. Solar energy
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11. list three properties of acids, and give an example. (p. 2,3, 8)
Three properties of acids and an example: 1. Acids have a sour taste (e.g., acetic acid in vinegar). 2. Acids react with active metals (like Zn, Mg) to produce hydrogen gas (e.g.,…
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11. list three properties of acids, and give an example. (p. 2,3, 8) 12…
Three properties of acids: 1. Taste sour (e.g., lemon juice with citric acid). 2. React with metals to produce $\ce{H_{2}}$ (e.g., $\ce{HCl + Zn -> ZnCl_{2} + H_{2}}$). 3. Turn bl…
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question 6 6. what physical property can be used to separate a mixture …
B. Evaporation
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question 5 5. which of the following are homogeneous mixtures? select a…
saltwater, lemonade
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10. compare the conductivity for ionic and covalent compounds. (p. 2)
- **Ionic Compounds**: Conduct electricity when molten or in aqueous solution (due to mobile ions) but are poor conductors in the solid state (ions are immobile in the lattice). -…
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does the author’s use of free verse allow him to effectively express hi…
The use of free verse allows him to use unconventional rhythm.
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question 4 4. which of the following are pure substances? select all th…
A. oxygen, B. water, E. gold (assuming options are labeled A:oxygen, B:water, C:saltwater, D:lemonade, E:gold) (If options are unlabeled by text, the correct ones are "oxygen", "w…
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4. calculate the ph of a solution with $\\text{h}^+ = 6.0 \\times 10^{-…
4. ~4.22 5. ~11.30 6. 10.80 7. ~1.60 8. Decreases by a factor of 10 9. More acidic (if final pOH >3, [OH⁻] decreases)
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question 3 3. look at the chart below. based on the chart, which substa…
Substance C
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8. what are electrolytes, and what purposes do they serve in the human …
Electrolytes are substances (like salts, acids, bases) that dissociate into ions in solution (or melt) and conduct electricity. In the human body, they: 1) Regulate fluid balance …
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7. why do ionic substances dissolve in water better than nonpolar subst…
Ionic substances dissolve better in water than nonpolar substances because water is a polar molecule. Ionic compounds consist of positive and negative ions. The polar water molecu…
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6. why are carbonated beverages bottled with so much pressure? (p. 8)
Carbonated beverages are bottled with high pressure to increase the solubility of carbon dioxide ($\ce{CO_2}$) in the liquid (per Henry's Law: gas solubility ∝ partial pressure of…
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5. compare the solubility of nacl and kcl at 70 degrees using the graph
At 70°C, the solubility of KCl is greater than the solubility of NaCl (e.g., KCl solubility ≈ 48 g/100g water, NaCl ≈ 37 g/100g water from typical solubility graphs).
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4. how do polar and nonpolar substances differ? give an example of each…
- Difference: Polar substances have a permanent dipole moment (due to unequal sharing of electrons, creating partial positive and negative charges), while nonpolar substances have…
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electrical bonding investigation quick check which measurable property …
surface tension
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electrical bonding investigation quick check which statement explains t…
The higher the temperature, the more molecules will vaporize, resulting in a greater vapor pressure.
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which words refer to the temperature at which a substance will vaporize…
boiling point
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3. using the graph above, describe the connections between the temperat…
For solid solutes (from the graph), **solubility increases with increasing solvent temperature** (all solid solute solubility curves have positive slopes, showing a direct relatio…
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electrical bonding investigation quick check which statement describes …
Molecules in the substance gain kinetic energy and then become less tightly bound to each other.
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3. using the graph above, describe the connections between the temperat…
For solid solutes (like the ones in the graph: $\ce{NH4Cl}$, $\ce{KCl}$, $\ce{NaCl}$, $\ce{KClO3}$), as the temperature of the solvent (water) increases, the solubility of the sol…
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electrical bonding investigation quick check the measurable properties …
A. electrical forces between particles, as given by Coulomb's law
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2. a mixture separates into layers over time. this is a select .
heterogeneous mixture (or immiscible mixture, suspension - depending on context, but heterogeneous mixture is the broad term for mixtures with non - uniform composition and visibl…
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lesson 1 1. what have you heard about ph? can you think of an example o…
1. pH measures solution acidity/alkalinity (0 - 14, 7 neutral). Example: Soil pH for agriculture (blueberries need pH 4.5 - 5.5). 2. Example beverages: Lemon juice (pH 2 - 3, acid…
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how do forensic analysts reveal fingerprints on rough surfaces like pap…
A. By applying chemicals that react with acids and salts
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carrie is conducting an experiment on a solution. the solutions initial…
B. a strong base, such as sodium hydroxide (NaOH)
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read the poem roses, by george eliot you love the roses—so do i. i wish…
A. "Roses" uses a more modern form
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buffers are weak acids or weak bases that can react with strong acids a…
prevent sudden changes in pH
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buffers are choose that can react with strong acids and bases to choose…
weak acids or weak bases
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critical thinking questions 9. why do carbonic and sulfuric acid requir…
Carbonic (from \(CO_3^{2-}\)) and sulfuric (from \(SO_4^{2-}\)) acids’ anions have a -2 charge, requiring 2 \(H^+\) to neutralize. HCl (from \(Cl^-\)) and \(HNO_3\) (from \(NO_3^-…
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select the text that has a more objective tone. no planet or star or ga…
The text starting with "Outer space is just what its name implies. It is the void that lies beyond the uppermost reaches of the atmosphere of Earth and between all other objects i…
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when amanda poured some of the liquid in a test tube, she noticed that …
1. adhesion 2. cohesion 3. solute 4. hydrogen 5. neutral 6. water
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what gas is used to fill the balloons so they can fly? o oxygen o heliu…
B. Helium
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6. name the following compounds. each includes at least one polyatomic …
a) Sodium phosphate b) Ammonium sulfate c) Magnesium acetate d) Ammonium sulfide e) Calcium carbonate f) Barium nitrate
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the maximum line pressure for acetylene is select one: a. 15 p.s.i. b. …
a. 15 P.S.I.
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chemical equations tips for success - read the assignment carefully and…
The friend is not right. The chemical equation \( \ce{CaCO_3 ightarrow CaO + CO_2} \) follows the law of conservation of matter. In the reactant (\( \ce{CaCO_3} \)), there is 1 Ca…
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what is produced during the replacement reaction of cu(no₃)₂ and zn? ○ …
Zn(NO₃)₂ + Cu
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a medical technician is working with the four samples of radionuclides …
- Order of initial radioactivity (decreasing): \(B > A > C > D\) - Time for sample A: \(171\) hours - Time for sample B: \(60\) minutes - Time for sample C: \(18\) days - Time for…
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what else is produced during the replacement reaction of magnesium and …
A. MgCl₂
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how many atoms of each element are in the chemical formula $nh_4no_3$? …
2 nitrogen, 4 hydrogen, and 3 oxygen
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a medical technician is working with the four samples of radionuclides …
- Order of initial radioactivity (decreasing): \(C > A> B > D\) - Time for sample A: \(390\) hours - Time for sample B: \(1700\) days - Time for sample C: \(5\) hours - Time for s…
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why do natural polymers not pose as much of an issue in landfills as sy…
Natural polymers are biodegradable, and synthetic polymers are not biodegradable.
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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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a medical technician is working with the four samples of radionuclides …
| sample | initial radioactivity (order) | time for amount of radionuclide to decrease to \(1/4\) of initial amount | |---|---|---| | A | Second highest | \(56\) days | | B | Thir…
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fluorine has an atomic number 9. it is in period 2 of the periodic tabl…
B. seven
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eugene works at a carpet factory. which natural polymer does he most li…
wool
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a chemical reaction that has the general formula of ab → a + b is best …
decomposition
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what is a limitation of using a chemical formula, such as $c_6h_{12}o_6…
B. The chemical formula does not show how the atoms are connected to one another.
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question 79 the atmosphere is approximately 80% ______ gas. ○ n₂ ○ co₂ …
\(N_2\)
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question 10. four elements are shown in the diagram below. which elemen…
Element 4
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question 9. arrange the following elements from lowest to highest ioniz…
Iodine (I) < Bromine (Br) < Chlorine (Cl) < Fluorine (F)
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a medical technician is working with the four samples of radionuclides …
- Sample A: \(30\) minutes - Sample B: \(75\) days - Sample C: \(192\) hours - Sample D: \(24\) days
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question 7. rank the following elements in order of increasing atomic r…
Chlorine (Cl) < Sulfur (S) < Phosphorus (P) < Silicon (Si)
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a medical technician is working with the four samples of radionuclides …
- Order of samples by decreasing initial radioactivity: \(B > A > C > D\) - Time for sample A: \(36\) hours - Time for sample B: \(20\) minutes - Time for sample C: \(312\) hours …
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question 6. select all the elements that have a smaller atomic radius t…
The elements with a smaller atomic radius than sodium (Na) are: - Magnesium (Mg) - Aluminum (Al) - Neon (Ne)