Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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for each statement below, indicate whether it is true or false. 1. brea…
1. False 2. True 3. True 4. True 5. True 6. False 7. False 8. True 9. True 10. True
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given the electronegativity of each of the following atoms, rank the bo…
1. O-H 2. C-O 3. C-N 4. C-H 5. C-C
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multiple choice question a base is a substance that ______. lowers h⁺ a…
A. lowers $\text{[H}^+]$ and increases the pH when it dissociates in water
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fill in the blank question a substance that increases h⁺ and decreases …
Acid
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how many hydrogen atoms are there in baking a. 1 b. 2 c. 3 d. 4
c. 3
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multiple choice question a single water molecule can spontaneously brea…
One positive hydrogen ion and one negative hydroxide ion
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in the equation given below, identify (equation: 2h₂ + o₂ — 2h₂o) mark …
a. 2H2O, b. 2H2, c. O2
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in the equation given below, identify the... $2h_2 + o_2 \ ightarrow 2h…
b. H
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fill in the blank question when 1 g of sugar is dissolved in 500 ml of …
solute; solvent
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multiple choice question if two atoms are joined by a polar covalent bo…
higher electronegativity
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select all that apply molecules that are more polar tend to have which …
A. A higher specific heat D. A higher heat of vaporization
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what is the rhyme scheme in the first stanza of holman’s poem \we pulle…
A. ABBA
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what is the rhyme scheme in the first stanza of cullen’s poem \if you s…
B. ABAB
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which of the following describes hydrogen bonds? they are stronger than…
They are about 5 - 10% as strong as covalent bonds.
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select the reasons why the molecule formed by two hydrogen atoms (h₂) i…
It has no net charge. It is held together by a covalent bond. It has no unpaired electrons.
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1. the oligarchs were in control, although they comprised only 0.0032 o…
1. 400000 2. 4000 3. 184 grams 4. 2310 grams 5. 40 miles
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multiple choice question when nacl is formed, ______. ○ a chlorine atom…
a sodium atom loses an electron, while a chlorine atom gains an electron
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fill in the blank question unlike bonds, which produce a crystal lattic…
Unlike **ionic** bonds, which produce a crystal lattice, **covalent** bonds are formed between 2 individual atoms, giving rise to true, discrete molecules.
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what is true of a molecule of gaseous hydrogen (h₂)? it has no net char…
It has no net charge.
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covalent bond ionic bond hydrogen bond hydrophobic interaction van der …
- Covalent bond → Sharing of electrons - Ionic bond → Attraction between oppositely charged atoms - Hydrogen bond → Attraction between a covalently bound H atom with a slight posi…
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quiz question 2 of 10 the two types of weathering are choose one option…
C. mechanical and chemical.
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multiple choice question atoms of different chemical elements can be di…
C. protons in the nucleus
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which characteristic is not true about solutions? they can be filtered …
They can be filtered
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two liquids that do not dissolve in each other are called solution inso…
The correct option (assuming the yellow box is labeled as B. immiscible) is B. immiscible
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give the iupac name for each compound. part 1 of 3
# Explanation: ## Step1: Identify the longest carbon chain The longest carbon chain here has 5 carbons (pentane backbone). Let's analyze the structure: the central carbon is conne…
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6. acamp fe 0007 10 pts possible the mole concept is important in chemi…
1. atoms and molecules are very small and the mole concept allows us to count atoms and molecules by weighing macroscopic amounts of material
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if 5.1 g of h₂ were to be mixed with 20.52 g of o₂, 2 h₂ + o₂ → 2 h₂o, …
1. \( \text{O}_2 \)
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4. brodbelt 3200428 10 pts possible consider the following reaction: \\…
6. \( \text{H}_2\text{O} \); 7.20 g left over
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3. brodbelt 3200428 1 10 pts possible consider the following reaction: …
1. \( \text{H}_2\text{O} \); 7.20 g left over
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2. brodbelt 3200428 warm 10 pts possible consider the following reactio…
1. \( \text{H}_2\text{O} \); 7.20 g left over
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1. stoich 1a 10 pts possible how many grams of no can be produced from …
3. 16.7 g
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practice: ionic naming race complete one box at a time. you must come u…
1. Sodium fluoride 2. Strontium sulfide 3. Copper (I) sulfide 4. Potassium carbonate 5. Calcium chloride 6. Beryllium hydroxide 7. Zinc iodide 8. Magnesium phosphate 9. Ammonium i…
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practice: ionic compounds nomenclature name the following ionic compoun…
### Naming Ionic Compounds: 1. Magnesium nitrate 2. Manganese(II) sulfide 3. Potassium oxide 4. Lithium carbonate 5. Calcium hydroxide 6. Nickel(II) phosphide 7. Potassium phospha…
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balancing chemical equations andres hooper multiple-choice question whi…
$\text{N}_2 + 3\text{H}_2 ightarrow 2\text{NH}_3$ (the first multiple-choice option)
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practice: properties of matter part 1 classify the following properties…
## Part 1 1. E (Mass) 2. I (Boiling point) 3. I (Combustibility) 4. I (Volatility) 5. I (Density) 6. I (Viscosity) ## Part 2 7. P (Density) 8. P (Odor) 9. C (Ability to react with…
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multiple-choice question how many nitrogen atoms are there on the react…
B. 2
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practice: classification of matter part 1 classify the following as a s…
## Part 1 1. S 2. M 3. S 4. S 5. M 6. M ## Part 2 7. E 8. C 9. C 10. E 11. E 12. E ## Part 3 13. HE 14. HE 15. HO 16. HO 17. HO 18. HO ## Part 4 19. E 20. E 21. HE 22. C 23. E 24.…
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multiple-choice question when you change the subscript... (choose all t…
- the molecule changes from water to peroxide. - the number of atoms changes. - the reaction changes.
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practice problems: 1. lithium has an atomic mass of 7 and an atomic num…
1. 4 2. 10 Part 4: 1. In the atom's nucleus (central core) 2. In electron shells/orbitals surrounding the nucleus
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multiple - choice question can you change the subscripts when balancing…
No
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part 1: the atomic cheat sheet before we start, lets remember the \big …
### Part 1 Completed Rules: 1. Atomic Number = Number of $\text{Protons}$ 2. Atomic Mass = $\text{Protons}$ + Neutrons 3. Neutral Atoms = Protons and Electrons are always $\text{e…
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balancing chemical equations multiple-choice question how many h₂ do we…
2
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balancing chemical equations andras hooper hydrogen gas and oxygen gas …
No
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balancing chemical equations multiple-choice question the equation is b…
True
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when diluting a concentrated acid, the rule is to: add acid and water s…
B. add acid to water (assuming the options are labeled as A: add acid and water simultaneously, B: add acid to water, C: add water to acid, D: not use acid in the lab) ### Second …
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liquids must kept be in a sealed container when they are heated. true f…
False ### Question 8: If the clothing of a co - worker catches fire, the best way to put out the fire is to:
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4. potassium iodide reacts with bromine in a single replacement reactio…
$476.4\space g$ ### Question 5
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1. nitrogen and hydrogen react to form ammonia gas (nh3). if 56.0 grams…
$68.0$ grams ### Question 2
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part a explain the difference between a single - displacement reaction …
1. In a $\boldsymbol{\text{single}}$ replacement reaction one element displaces another in a compound. 2. In a $\boldsymbol{\text{double}}$ displacement reaction $\boldsymbol{\tex…
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explain the differences between the two methods. drag the appropriate i…
### Bin 1: "By the type of chemistry occurring during the reaction" - acid - base reactions - double - displacement - precipitation reactions - gas evolution reactions ### Bin 2: …
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read the first six lines of donnes \holy sonnet 14.\ if the first line …
Line 2: b Line 3: b Line 4: a Line 5: a Line 6: b
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it takes 3.11 ml of water to fully dissolve 4.54 grams of urea to form …
0
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2.78 grams of urea is dissolved in 51.22 grams of water. the water had …
9080
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which are negative effects of desalination plants in the middle east? c…
- taking a large amount of energy to start and operate - causing conflicts between countries over development rights - releasing dangerous chemicals into the environment - adding …
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homework two due sunday by 11:59pm points 5 submitting a file upload pl…
To solve this, we analyze each dispute: ### Part a - **Type of Case**: Civil case (breach of contract). - **Plaintiff**: Ernie (the one who suffered harm from Bert’s breach). - **…
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use the activity series below to predict the products of each of the fo…
s: For $Zn_3(PO_4)_2 + Ca$: $\boldsymbol{Ca_3(PO_4)_2 + Zn}$ For $AgCl + Na$: $\boldsymbol{NaCl + Ag}$
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complete the following sentence: when k⁺ and cl⁻ forms an ionic bond...…
d) ... they are held together by electrostatic forces.
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maw. he assures them that their last sample is impure and quite useless…
D. It explains that he could not find the specific salt needed to make his transformation.
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“what! jekyll!” he cried. “i trust you are better.” “i am very low, utt…
A. It reveals why Jekyll looked so sad and would not join the men.
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experiment 2 pre - lab questions name: section: answer all calculation …
1. Density is mass per unit volume. Solids: $\text{g/cm}^3$; Liquids: $\text{g/mL}$ 2. Water displacement method 3a. $19.58\ \text{mL}$ 3b. $0.7125\ \text{g/mL}$
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chemistry • kearns high school period: ______ guide notes on chem stand…
The concentration of the solution indicates the **amount** of **solute** dissolved in a **given amount of solvent/solution** at a certain **temperature** (Note: The most standard …
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chemical bonds coal, graphite, and diamond are made of carbon. why are …
the number of bonds (the option with the text "the number of bonds")
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chemical bonds coal, graphite, and diamond are made of carbon. why are …
carbon (the option with "carbon" as the text, so the checkbox next to "carbon" should be selected)
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what is a factor that can significantly affect dissolved oxygen levels …
4. presence of chemical pollutants
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physical properties are those that are observable without changing the …
True
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when water turns into ice its chemical identity remains unchanged (liqu…
physical change
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2. the 2.6 g sample is c. identify the molar mass of c. i need a hint g…
12.01
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what does a physical property not describe? the chemical make - up of a…
the chemical make-up of a substance
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multiple-choice question what does a physical property describe? a char…
a characteristic that can be observed without changing the matter into another type of matter.
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sewage, manure, farm runoff, and fertilizers are associated with what t…
inorganic nutrient (the option labeled "inorganic nutrient")
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what class of water pollution can cause excessive growth of algae in wa…
A. inorganic nutrients such as nitrogen and phosphorus
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organic waste is especially problematic because it uses large amounts o…
manure from livestock feeding operations
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at what temperature is water most dense? 4 degrees celsius 95 degrees c…
A. 4 degrees Celsius
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which substance is known as the universal solvent because it can dissol…
Water
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which element of art did casteel use to create the flower on the bedspr…
Organic shape
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when water changes to a gas at temperatures below the boiling point, wh…
Evaporation
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16) if you insert 32.75 grams of h₂, how many moles of ch₃oh are produc…
The number of moles of $\ce{CH3OH}$ produced is $\boxed{8.19}$ moles (rounded to two decimal places) or $\boxed{8.1875}$ moles (exact value).
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must do - observing oxidation & reduction station data table observatio…
### Data Table | Observation Time | What You See | |-------------------|--------------| | Immediately | Shiny reddish-brown copper wire; colorless solution | | After 3-4 minutes |…
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co + 2 h₂ → ch₃oh 15) if you insert 2.27 moles of co, how many grams of…
Approximately 9.15 grams.
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14) if 77.32 grams of s are used, how many moles of al are used?
Approximately \( \boldsymbol{1.61 \, \text{moles}} \) of Al are used (or \( 1.607 \, \text{mol} \) for more precision).
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2 al + 3 s → al₂s₃ (13) if 3.12 moles of al₂s₃ are used, how many grams…
Approximately 300 grams (or 299.97 grams) of S are used.
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2 al + 3 s → al₂s₃ 13) if 3.12 moles of al₂s₃ are used, how many grams …
Approximately \( 300\ \text{g} \) (or more precisely \( \approx 299.97\ \text{g} \)) of S are used.
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12) if 1.95 moles of h₂o are used, how many grams of co₂ are used?
Approximately \(\boldsymbol{85.8}\) grams (or more precisely \(85.82\) grams) of \(CO_2\) are used.
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ch₄ + 2 o₂ → co₂ + 2 h₂o 11) if 2.59 moles of o₂ are used, how many gra…
\( \approx 20.8 \) grams (or more precisely \( \approx 20.77 \) grams)
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what happens to the particles of a substance as its temperature increas…
They move faster.
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nuclear chemistry worksheet using your knowledge of nuclear chemistry, …
$^{198}_{86}\text{Rn} ightarrow ^{194}_{84}\text{Po} + ^{4}_{2}\text{He}$
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2 fe₂o₃ + 3 c → 4 fe + 3 co₂ 9) how many moles of fe will be produced i…
\( \approx 0.694 \) moles (or more precisely \( 0.6937 \) moles)
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how do rock types contribute to the rate of weathering? porous minerals…
A. Porous minerals weather faster.
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which factor increases as a result of increasing altitude? air pressure…
space between gas molecules
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give 3 examples of weathering.
1. Freeze - thaw action (physical weathering): Water enters rock crevices, freezes (expands), and fractures the rock. 2. Oxidation (chemical weathering): Iron - rich rocks react w…
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which household activity is a significant source of volatile organic co…
C. using chemical - based cleaning products
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some rock formations emit a radioactive gas that is responsible for cau…
D. radon
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why do garages usually have low air quality? they are outside. chemical…
The correct option is: Chemicals are stored in garages.
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substance organic name, function and/or diagram aspirin (asa) acetylsal…
### Completed "Interesting Organic Molecules" Table: | Substance | Organic name, function and/or diagram | |-------------------------|---------------------------------------------…
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3. (partially visible text about health and risk) 4. copy the structura…
1. Oranges: Limonene (cyclic terpene) - flavor/aroma, antioxidant 2. Pine trees: Pinene (bicyclic terpene) - pest defense, pine scent 3. Ester #1 (Ethyl acetate): $\text{CH}_3\tex…
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8. a chemical reaction that theoretically could produce 200 g of substa…
70
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7. if a reaction produces 88 grams of co₂ and the molar mass of co₂ is …
2 moles
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6. a reaction has a theoretical yield of 45 grams of product, but the a…
80% (corresponding to the option: 80%)
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5. in a chemical reaction, if you have 2.5 moles of reactant a and the …
5.0 moles
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4. in the reaction hcl + naoh → nacl + h₂o, this is an example of: a pr…
An acid-base reaction