Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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if a 0.510 $m$ aqueous solution freezes at $-2.90\\ ^\\circ\\text{c}$, …
$3.06$
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question 34 of 36 assuming 100% dissociation, calculate the freezing po…
$T_f = -14.4^\circ\text{C}$ $T_b = 103.9^\circ\text{C}$
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when 12.3 g of an organic compound known to be 62.04% c, 10.4% h, and 2…
$\text{C}_6\text{H}_{12}\text{O}_2$
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a metal, m, of atomic mass 56 amu reacts with chlorine to form a salt t…
$\text{MCl}_2$ (or specifically, $\text{FeCl}_2$, since M has atomic mass 56 amu, iron)
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read the lines from \the tide rises, the tide falls.\along the sea-sand…
It strengthens the connection between the two lines.
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average chemical composition— set 1 —— set 2 —1. earths hydrosphere is …
1. (2) liquid water layer of Earth 2. (4) oxygen and silicon 3. (2) oxygen 4. (4) 5. (2) hydrogen 6. (1) iron 7. (1) the crust 8. (1) O and Si 9. (3) iron
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4. based on the following balanced equation, $2\\text{fe}(s) + 3\\text{…
a. +3 (Iron(III) ion, $\text{Fe}^{3+}$) b. $0.01398$ moles
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6) what is the percent yield of $\text{co}_2(g)$ if 46.5 grams of $\tex…
6. $\approx 64.0\%$ 7. $\approx 69.2\%$ 8. $\approx 129\ \text{g}$ (rounded to 3 significant figures) 9. $\approx 142\ \text{g}$ (rounded to 3 significant figures) 10. $\approx 92…
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write the balanced chemical formula for photosynthesis in symbols and w…
## In Symbols: ### Reactants: $6\text{CO}_2 + 6\text{H}_2\text{O}$ (plus light energy, chlorophyll) ### Products: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$ Balanced equati…
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3. based on the following balanced equation, fe (s) + cuso₄(aq) → feso₄…
a. +2 (or 2+) b. 0.009321 mol
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of 9.0 moles of potassium chlorate (kclo₃)? 4. ____ c₆h₆o + ____ o₂ → _…
0.8 moles of $\ce{O2}$ reacted.
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4. $\boldsymbol{2 c_6h_6o + 11 o_2 ightarrow 12 co + 6 h_2o}$ how many …
1.1 moles
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critical thinking: why is the number of valence outer shell electrons m…
(Visual description of the Bohr model: A central red oxygen nucleus, surrounded by a second electron shell with 8 electrons (4 as unpaired dots, 2 pairs each connected to a hydrog…
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read the poem. paul reveres ride by henry wadsworth longfellow (1) list…
D. The rhythm and rhyme scheme add to an eerie and suspenseful tone.
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periodic table literacy understanding element tiles before determining …
### Understanding Element Tiles #### Sodium - Atomic Number: $11$ - Symbol: $\text{Na}$ - Atomic Mass: $22.99$ #### Carbon - Atomic Number: $6$ - Symbol: $\text{C}$ - Atomic Mass:…
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read the poem. paul reveres ride by henry wadsworth longfellow (1) list…
It creates an eerie, suspenseful mood.
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name: date: 2/10/26 block: reading: the nature of chemical bondsreading…
| Ionic Bonds | Covalent Bonds | |-------------|----------------| | Forms via electron transfer | Forms via electron sharing | | Occurs between metal + non-metal | Occurs between …
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question① what is the name for the acid with the formula $\text{hno}_2$…
Nitrous acid
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question given the formula for borate as $bo_3^{3-}$, what is the formu…
$\text{H}_3\text{BO}_3$ (the second option)
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question ① what is the formula for chromous acid? answer $ce{h_{2}cr_{2…
$\text{H}_2\text{CrO}_2$
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question what acid is formed from the bromide ion? answer $h_2br$ $hbr$…
B. HBr
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question what is the name for the acid with the formula $h_3po_5$? answ…
Perphosphoric acid
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question ⓘ identify the formula for permanganic acid. answer $h_2mno_4$…
B. $\text{HMnO}_4$
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question ① which pair correctly matches the name for an acid with its f…
A. Sulfuric acid, $\text{H}_2\text{SO}_4$
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question 1 identify the formula for pernitric acid. answer hno hno₃ h₂n…
$\boldsymbol{\text{HClO}_4}$ (Note: correcting a potential typo in the options, as the intended correct formula for perchloric acid is $\text{HClO}_4$; if the last option was mean…
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questionwhat is the name for the acid with the formula hi?answeriodous …
Hydroiodic acid
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since the video is playing in reverse, this represents the solid produc…
The mass of $\text{NaHCO}_3$ required is approximately $\boldsymbol{3.57\ \text{g}}$, with the dimensional analysis filled as: $2.29\ \text{g}\ \text{Na}_2\text{CO}_3 \times \frac…
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question identify the formula for chromic acid. answer $hcro_4$ $h_2cro…
$\boldsymbol{\text{H}_2\text{CrO}_4}$ (the second option)
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show the dimensional analysis set-up needed to calculate the mass of na…
The complete dimensional analysis setup is: $2.29\ \text{g}\ \text{Na}_2\text{CO}_3 \times \frac{1\ \text{mol}\ \text{Na}_2\text{CO}_3}{105.99\ \text{g}\ \text{Na}_2\text{CO}_3} \…
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2. you used stoichiometry to predict how many grams of solid product wo…
Reaction 4 (the decomposition of $\text{NaHCO}_3$ to $\text{Na}_2\text{CO}_3$, $\text{CO}_2$, and $\text{H}_2\text{O}$) occurred, as its predicted solid product mass (4.1181 g) is…
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20. if reaction #4 occurs, you calculated that 0.03885 moles $ce{na_{2}…
$4.1181$ g
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19. use the equation you built in the previous problem. calculate how m…
0.03885 mol
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18. construct the mole ratio needed to calculate how many moles of $ce{…
Filled equation: $0.0777\ \text{mole NaHCO}_3 \times \frac{1\ \text{mole Na}_2\text{CO}_3}{2\ \text{mole NaHCO}_3} = 0.03885\ \text{mol Na}_2\text{CO}_3$ Final moles of $\text{Na}…
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17. last one! predict the mass of the solid that remains if reaction #4…
The balanced coefficients (in order) are 2, 1, 1, 1. The coefficient for $\text{NaHCO}_3$ is $\boldsymbol{2}$.
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16. if reaction #3 occurs, you calculated 0.03885 moles $ce{na_{2}o}$ w…
$2.408\ \text{g}\ \text{Na}_2\text{O}$
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15. use the equation you built in the previous problem. calculate how m…
0.03885 moles of $\text{Na}_2\text{O}$
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fireworks operators usually fall into one of two camps: those who striv…
- Some people like loud fireworks. - Stunning visual effects are possible with fireworks.
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14. construct the mole ratio needed to calculate how many moles of $na_…
Filled calculation: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol Na}_2\text{O}}{2\ \text{mol NaHCO}_3} = 0.03885\ \text{mol Na}_2\text{O}$ Final moles of $\text{Na}_2\tex…
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13. next, you will consider possible reaction #3. balance the chemical …
The coefficients (in order) are 2, 1, 2, 1.
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12. here is the summary of the two solids remaining if reaction #2 occu…
### Solid Remaining: Na: 1.79 g C: 0.933 g ### Total mass of solid produced: 2.72 g
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11. recall that there are 0.0777 moles $\text{nahco}_3$ reacting. calcu…
0.0777 mol C
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10. recall that there are 0.0777 moles $\\text{nahco}_3$ reacting in th…
0.0777 mol
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a lizard egg needs a temperature of 26-30°c to hatch properly. you plac…
D. Calcium chloride because it will create an exothermic reaction.
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9. next, predict the mass of the solid that would remain if reaction #2…
The coefficients (from left to right) are 2, 2, 1, 2, 3. The solid products are $\text{Na}(s)$ and $\text{C}(s)$; their total molar mass per 2 moles of $\text{NaHCO}_3$ is $(2\tim…
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chemistry unit 3 – quiz 1 practice 13. (5 pts) calculate the percent ab…
Percent abundance of Lutetium-175: \(97.40\%\) Percent abundance of Lutetium-176: \(2.60\%\)
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8. you calculated that 0.0777 moles naoh will remain if reaction #1 occ…
$3.108\ \text{g}$
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7 a cook had a jar containing a sweet food and a jar containing a sour …
A. The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.
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6 scientists digging in a cave found an unknown substance. the scientis…
a. into the substance, and the substance changed into a gas.
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5. a scientist has a container with a substance inside. at first, the m…
b. Before, the substance was a gas. Later, it was a liquid.
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7. use the equation built in the previous problem. calculate how many m…
0.0777 moles
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3. divers found two substances at the bottom of the ocean. at room temp…
a. weaker attraction between its molecules than Substance 2. Its molecules now move in place.
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6. construct the mole ratio needed to calculate how many moles of naoh …
Filled conversion: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol NaOH}}{1\ \text{mol NaHCO}_3} = 0.0777\ \text{mol NaOH}$ Final moles of NaOH: $0.0777$
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9. classify the following changes as physical or chemical. a. boiling b…
a. Boiling: Physical change b. Crumpling: Physical change c. Burning: Chemical change d. Freezing: Physical change e. Evaporating: Physical change f. Rotting: Chemical change g. R…
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5. you can now convert the student response moles $ce{nahco_{3}}$ to mo…
$\text{NaHCO}_3(s) ightarrow \text{NaOH}(s) + \text{CO}_2(g)$ The coefficients are: 1, 1, 1
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4. you measured the mass of the baking soda ($nahco_3$) to be 6.53 gram…
$0.0777$ moles (rounded to three significant figures)
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heres the dimensional analysis setup from the previous problem: $14.3 \…
7.15 moles of $\text{O}_2$
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1 multiple choice 2 points what is the answer, with the correct number …
109.30 g ---
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4. when two nonpolar molecules are compared, we should consider the num…
1. Question 4: Butane, $\text{C}_4\text{H}_{10}$ 2. Question 5: Butane has the greatest number of electrons of the three molecules, making it the most polarizable. More polarizabl…
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the truth about tobacco what is in tobacco? a single puff of cigarette …
### What Is In Tobacco? NICOTINE: **addictive stimulant** drug found in **tobacco** CARBON MONOXIDE: A **colorless, odorless**, poisonous **gas** produced when tobacco burns. TAR:…
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bend and stretch = structure and function of designed materials student…
Evidence: The C-F bond (485 kJ/mole) has higher bond energy than the C-H bond (413 kJ/mole). Reasoning: Stronger C-F bonds in PTFE require more energy to break, so PTFE is stable …
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jocelyn and her friends put some raisins, hazelnuts, almonds, and peanu…
a mixture
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part 1. complete each question using your bag of candy. show all work t…
1. 12 2. (Completed Table 1 below) 3. (Completed Table 1 below) 4. Orange, $\ce{^{7.01}O}$ (Orange-7.01) 5. 41% (highest percentage abundance) 6. ~5.78 (predicted average atomic m…
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a student selects two identical glasses, labels them p and q, and fills…
Sugar dissolves completely in glass P, and sand settles at the bottom of glass Q.
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packing peanuts are commonly used as shipping material. some are manufa…
☑ Cornstarch Evidence: Cornstarch has polar -OH groups in its molecular structure that form hydrogen bonds with water, making it water-soluble and biodegradable, so it does not co…
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three students are mixing the same type of solute in 500 ml of water. j…
Hunter → Jessica → Larry
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ii. prelab questions (answer questions in your notebook): 1. what is th…
1. $2\text{Mg} + \text{O}_2 ightarrow 2\text{MgO}$ 2. Limiting reactant: $\text{Mg}$ (it is the finite reactant being burned); Excess reactant: $\text{O}_2$ (unlimited supply from…
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oil and water placed in a jar will separate. even when shaken and mixed…
Oil and water have a low solubility because they have separate chemical properties.
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naomi has increased the pressure on a solution of liquid and gas in a c…
increase the amount
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four solutes are added to a solvent. all solutes have the same mass and…
10 mm²
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ii. prelab questions (answer questions in your notebook): 1. what is th…
1. $2\text{Mg} + \text{O}_2 ightarrow 2\text{MgO}$ 2. Limiting reactant: $\text{Mg}$ (it is the finite reactant being burned); Excess reactant: $\text{O}_2$ (unlimited supply from…
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maureen adds a spoonful of salt to a glass of cold water. which of the …
stirring the mixture
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read the list below: 1. sugar 2. pepper 3. lemon juice 4. carbon dioxid…
2 and 6 only
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explain to the people of westfield how the rust in their water formed.
Rust in your water forms through a chemical reaction involving the iron in your water pipes, oxygen, and water: 1. Iron from pipes reacts with dissolved oxygen and water to form i…
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3. a new childrens toy company is designing its logo. select the respon…
○ They should consider colors that are red and yellow to set the mood of energy, excitement, and youth.
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phosphorus atomic number atomic mass number of protons number of electr…
### Phosphorus | Category | Value | |------------------------|-------| | Atomic Number | 15 | | Atomic Mass | 31 | | Number of Protons | 15 | | Number of Electrons | 15 | | Number…
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boron atomic number atomic mass number of protons number of electrons n…
### Boron Table: | Category | Value | |------------------------|-------| | Atomic Number | 5 | | Atomic Mass | 11 | | Number of Protons | 5 | | Number of Electrons | 5 | | Number …
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question 1 of 15 which sentence describes a villanelle? a. it has 14 li…
C. It uses three-line stanzas and often repeats lines.
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questions to address in your conclusion: 1. what is the expected mole r…
The expected mole ratio of chlorine to magnesium is $\frac{2}{1}$ (or 2:1).
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marine debris is best described as being composed of _______. a. solid …
d. things discarded by humans
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lab #4 – empirical formula of a compound repo. name: anarec sasmiento l…
Average ratio of moles of chlorine to moles of magnesium: $18.9$ Empirical formula of magnesium chloride: $\text{MgCl}_{19}$ (Note: This non-standard result suggests possible expe…
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date trial 1 trial 2 mass of evaporating dish 46.0618g 45.5867g mass of…
Trial 1: 18.84 Trial 2: 18.96
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which statement best explains how the aswan high dam contributes to pol…
The dam affects the soil, which causes farmers to use fertilizers that create pollution.
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what is the ph for a solution with $oh^- = 8.9 \\times 10^{-9}$ m? resp…
$5.9\text{E}0$
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question 13 mark as: none calculate $\\text{h}_3\\text{o}^+$ for a solu…
For Question 13: $5\text{E-5}$ For Question 14: $5\text{E-6}$
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match each solution with its correct ph description. drag and drop opti…
soap = basic tea = acidic toilet bowl cleaner = acidic orange juice = acidic drain clog remover = basic
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question 7 mark as: none match each compound from the premise column wi…
- $\text{H}_2\text{O}$ = both amphiprotic and amphoteric - $\text{MnO}_2$ = amphoteric only - $\text{SnO}$ = amphoteric only - $\text{HS}^-$ = both amphiprotic and amphoteric
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question 6 mark as. none calculate the hydroxide ion concentration for …
3.6E-10
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1. $ce{k_{2}o + h_{2}o -> koh}$2. $ce{ni(clo_{3})_{2} -> nicl_{2} + o_{…
1. $K_2O + H_2O \to 2KOH$ 2. $Ni(ClO_3)_2 \to NiCl_2 + 3O_2$ 3. $2Al + 3CuO \to Al_2O_3 + 3Cu$ 4. $C_2H_4 + 3O_2 \to 2H_2O + 2CO_2$ 5. $2AlBr_3 + 3K_2SO_4 \to 6KBr + Al_2(SO_4)_3$…
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method 1: convert $oh^-$ to $h_3o^+$ first, then insert $h_3o^+$ direct…
Question 15.16: $6.0\text{E}0$ Question 15.17: $6.0\text{E}0$
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in precision from two to four decimal places (figure 15.9) the fact tha…
Question 15.14: $5\text{E-5}$ Question 15.15: $5\text{E-6}$
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match each solution with its correct ph description. drag and drop opti…
soap = basic tea = acidic toilet bowl cleaner = acidic orange juice = acidic drain clog remover = basic
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question 15.9 mark as: none rank the following acids by the amount of $…
1. 1.6 M HCl 2. 1.2 M HBr 3. 1.2 M HF
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7. valence electrons are important because they help determine an eleme…
B. chemical behavior
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according to the reading, this law made it illegal to obstruct the draf…
First question: a. The Espionage Act Second question: d. The discovery of the Zimmerman telegrams
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question 15.8 mark as: none match each compound from the premise column…
- $\text{H}_2\text{O}$ = both amphiprotic and amphoteric - $\text{MnO}_2$ = amphoteric only - $\text{SnO}$ = amphoteric only - $\text{HS}^-$ = both amphiprotic and amphoteric
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calculate the hydroxide ion concentration for a solution with $h_3o^+_{…
3.6E-10
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compound: p₄c mass of compound: 67.20g molar mass: \tconvert mass to mo…
| Compound | Molar Mass (g/mol) | Moles | |----------|---------------------|-------| | $\text{P}_4\text{C}$ | $135.89$ | $0.495$ | | $\text{Mg}_3(\text{PO}_4)_2$ | $262.87$ | $0.1…
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question 15.1 mark as: none what is the name of the compound present in…
Water (or $\text{H}_2\text{O}$)
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measuring moles lab you will visit 8 weighing stations. make note of ea…
1. **Carbon** - Molar Mass: $12.01\ \text{g/mol}$ - Moles: $10.86\ \text{mol}$ 2. **Silicon** - Molar Mass: $28.09\ \text{g/mol}$ - Moles: $0.728\ \text{mol}$ 3. **NaCl** - Molar …
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15) ___ag + ___f₂ → ___agf 16) ___k₂s + ___sr(clo₃)₂ → ___kclo₃ + ___sr…
15) $2\text{Ag} + \text{F}_2 ightarrow 2\text{AgF}$ 16) $\text{K}_2\text{S} + \text{Sr(ClO}_3\text{)}_2 ightarrow 2\text{KClO}_3 + \text{SrS}$ 17) $2\text{Na} + \text{ZnCO}_3 ight…