Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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a chemist carefully measures the amount of heat needed to raise the tem…
\boxed{0.45} (in units of \(\text{J·g}^{-1}·\text{K}^{-1}\))
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cfcs were chemicals commonly used in refrigeration and as propellants i…
C. CFCs were replaced with other products
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the epa is trying to decide whether or not to ban a certain chemical th…
scientific information about the chemical and its effects
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multiple choice question phytochemicals can be classified as ______ nut…
B. non-essential
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identify the element use each clue to determine the element. you will n…
1. Nitrogen 2. Lithium 3. Fluorine 4. Helium 5. Potassium
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subatomic particles complete the table below by counting the number of …
### Completed Table: | Element | # of Protons | # of Electrons | # of Neutrons | Total # of Particles | |---------|--------------|----------------|---------------|----------------…
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multiple choice question in chemistry terms, which of the following des…
a linkage between two atoms
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use ape - man to build the bohr models below. sulfur p = n = a = p = e …
### Sulfur Nucleus: $P=16$, $N=16$ $A=32$, $P=16$, $E=16$ $M=32$, $A=32$, $N=16$ ### Sodium Nucleus: $P=11$, $N=12$ $A=23$, $P=11$, $E=11$ $M=23$, $A=23$, $N=12$ ### Boron Nucleus…
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color by reactivity on the blank periodic table below shade in the foll…
1. Inert group: Shade **Group 18** with diagonal lines. 2. Highly reactive group: Shade **Group 1 and Group 17** with solid fill. 3. Somewhat reactive groups: Circle **Group 2, Gr…
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Question was provided via image upload.
Since the problem is not clearly stated (e.g., identifying the compounds, their functional groups, or another task), I'll assume a common task like naming the compounds or identif…
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match the image with its correct identity.
To solve this, we analyze each structure: ### First Structure (\(\boldsymbol{\ce{CH3CH2CHCH2CH2CH2CHCH3}}\) with a \(\ce{CH3}\) branch) - Count carbon atoms: The main chain (longe…
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multiple choice question a link between two atoms formed by sharing ele…
O bond
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____ are hydrocarbons that contain a halogen such as cl, f, i, or br. a…
A. Alkyl halides
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____ are compounds made up of only the elements carbon and hydrogen, wh…
C. Alkenes
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____ are compounds made up of only the elements carbon and hydrogen, wh…
B. Alkanes
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a chemist carefully measures the amount of heat needed to raise the tem…
\( 0.235\space J\cdot g^{-1}\cdot K^{-1} \)
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12. if an aqueous solution has a hydroxyl ion concentration of $10^{-2}…
$1.0\times10^{-12}\ \text{M}$
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10. calculate the ph of a solution that is 0.153 m hcl. √3
0.815
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if the reaction begins with 1.00 m of h₂ and f₂ and no hf, calculate th…
### First ICE Table and Results: | | $\text{H}_2$ | $\text{F}_2$ | $2\text{HF}$ | |------------|--------------|--------------|--------------| | Initial | $1.00\ \text{M}$ | $1.00\…
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write the keq for the following reactions: 1n₂(g) + 3 h₂(g) → 2 nh₃(g) …
1. $K_{eq} = \frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}$ 2. $K_{eq} = \frac{[\text{HBr}]^2}{[\text{H}_2][\text{Br}_2]}$ 3. $K_{eq} = [\text{CO}_2]$ 4. $K_{eq} = \frac{[\te…
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write the keq for the following reactions: 1n₂(g) + 3 h₂(g) → 2 nh₃(g) …
1. $K_{eq} = \frac{[\ce{NH3}]^2}{[\ce{N2}][\ce{H2}]^3}$ 2. $K_{eq} = \frac{[\ce{HBr}]^2}{[\ce{H2}][\ce{Br2}]}$ 3. $K_{eq} = [\ce{CO2}]$ 4. $K_{eq} = \frac{[\ce{NH3}]^2}{(1.5)[\ce{…
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what do these two changes have in common? filtering air to remove dust …
Both are only physical changes.
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4. what types of noncovalent interactions hold together the following s…
(a) Ionic interactions (electrostatic attractions between $\text{Na}^+$ and $\text{Cl}^-$ ions) (b) London dispersion forces (van der Waals forces between carbon sheets)
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what do these two changes have in common? mixing glue and laundry powde…
- Both conserve mass.
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question: after exploring some of the videos and topic readings, what i…
The process of measuring the amount of heat released or absorbed during a chemical reaction. (The third option in the list)
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multiple choice question for which audience would it be most important …
B. High school students
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what do these two changes have in common? building a tower out of magne…
Both are only physical changes.
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what do these two changes have in common? burning a marshmallow over a …
Both are chemical changes.
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what do these two changes have in common? sediment settling to the bott…
Both are only physical changes.
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14. use the vsepr theory to predict the molecular geometry of the follo…
a. NF₃: Trigonal pyramidal b. SiO₂: Linear c. CH₄: Tetrahedral
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10. convert one-hundred degrees celsius to kelvin. 11. convert sixty-fo…
1. $373.15$ K 2. $\approx 17.78$ $^\circ C$ 3. $260.15$ K 4. The preferred temperature scale used in scientific laboratories is the Kelvin scale.
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name per date 20. $\\ce{c3h8 + o2 -> co2 + h2o}$ 21. $\\ce{fe2o3 + co -…
20. $\text{C}_3\text{H}_8 + 5\text{O}_2 ightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$ 21. $\text{Fe}_2\text{O}_3 + 3\text{CO} ightarrow 2\text{Fe} + 3\text{CO}_2$ 22. $2\text{NaHC…
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part a write the conversion factor from grams to pounds. express your a…
$0.002205$ lb
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exercise 2.79 - enhanced - with feedback missed this? watch kcv: conver…
Part C: $2.294 \times 10^{13}\ \text{mg}$ Part D: $2.294 \times 10^{4}\ \text{metric tons}$
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missed this? watch kcv: converting between units, iwe: unit conversion.…
Part A: $2.294 \times 10^{7}\ \text{kg}$ Part B: $2.294 \times 10^{4}\ \text{Mg}$
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#7 an aqueous solution of zncl₂ is 0.118 mf zncl₂. the density of the s…
Normality of $\text{ZnCl}_2$: $0.236\ \text{N}$ Molality of $\text{ZnCl}_2$: $0.106\ \text{m}$
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22.1 in. to centimeters express your answer to three significant figure…
Part A: 56.1 centimeters Part B: 34.7 meters
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part a how many microliters are in 41.0 ml? 0.041 4.1 × 10^10 4.10 × 10…
4.10 × 10⁴
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part c iron has a density of 7.86 g/cm³ (1 cm³ = 1 ml). calculate the v…
$4.10$ dL
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using density as a conversion factor aluminum has a density of 2.70 g/m…
894
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using the relationship between mass and volume in density, determine wh…
| Given Value | Need | Conversion Factor | |-------------|------|-------------------| | 5.0 g | mL of sample | $\frac{1\ \text{mL}}{X\ \text{g}}$ | | 55 mL | g of sample | $\frac{…
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multiple-choice question which type of matter can be physically separat…
mixtures
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missed this? read section 2.10. you can click on the review link to acc…
\(1.26\ \text{g/cm}^3\)
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how many different substances make up a heterogeneous mixture? one elem…
2 or more
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in a homogeneous mixture everything is going to be located where? split…
spread equally around
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a pure substance is made up of what? one type of element or molecule mo…
one type of element or molecule
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what is a molecule? □ more than one type of atom bonded together. □ lot…
More than one type of atom bonded together.
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when do zeros count as significant digits, and when do not they count? …
1. Zeros at the end of a number with a decimal point: ARE significant 2. Zeros at the end of a number with no decimal point: are ambiguous 3. Zeros at the beginning of a number: a…
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how much of a radioactive kind of promethium will be left after 265 hou…
484
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how much of a radioactive kind of bismuth will be left after 8 minutes …
4960
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final passage requires just a simple majority so democrats should trium…
prevail
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6. match the definitions with the color scheme types. - a color scheme …
To solve this, we match each definition to the correct color scheme type by recalling color theory: 1. **"a color scheme that uses colors that are opposite of each other on the co…
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in the lab, greg has two solutions that contain alcohol and is mixing t…
600
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2. create a model of aluminium-13 isotope statements to help guide you:…
- The atomic number of Aluminum is $\boldsymbol{13}$. - Aluminum has $\boldsymbol{13}$ protons. - Aluminum -13 has $\boldsymbol{0}$ neutrons because $13 -$ the number of protons $…
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fill in the blank question mass is not or lost during any chemical chan…
First blank: created Second blank: destroyed
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answer in complete sentences 1. what is mummification? why did the anci…
Mummification is an ancient preservation process that involves treating a dead body with chemicals, wrapping it, and using other methods to slow or stop decomposition so the body …
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student exploration: chemical changes vocabulary: acid, base, catalyst,…
### Prior Knowledge Questions 1. **Answer & Explanation**: - **Brief Explanations**: When baking soda (sodium bicarbonate) and vinegar (acetic acid) are mixed, a chemical reaction…
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student exploration: chemical changes vocabulary: acid, base, catalyst,…
**: Yes, new substances are being created. We know this because bubbles (gas) are produced, indicating a chemical reaction where reactants are transformed into new products. 2. **…
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solutes and solvents quick check which substance is an example of a non…
vegetable oil
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which type of bond and how many bonds would occur as carbon dioxide (co…
four covalent bonds
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use the references to access important values if needed for this questi…
9.55
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
- Mole fraction of \( \text{N}_2 \): \( \approx 0.111 \), Mole fraction of \( \text{O}_2 \): \( \approx 0.889 \) - Partial pressure of \( \text{N}_2 \): \( \approx 66.7 \) torr, P…
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Question was provided via image upload.
\( 0.5 \) ### Question 7
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assignment 4: write the formulas for these ionic compounds: 1. copper (…
1. $\text{CuOH}$ 2. $\text{Na}_2\text{SO}_4$ 3. $\text{Mg(CH}_3\text{COO)}_2$ 4. $\text{(NH}_4\text{)}_3\text{PO}_4$ 5. $\text{Al}_2\text{(CO}_3\text{)}_3$ 6. $\text{KCN}$ 7. Silv…
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Question was provided via image upload.
\( 1.5055 \times 10^{23} \) (or \( 1.5 \times 10^{23} \)) atoms ### 2)
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3. potassium and sulfur - potassium charge: ______ - sulfur charge: ___…
### 3. Potassium and Sulfur - Potassium charge: $+1$ - Sulfur charge: $-2$ - Final formula: $\text{K}_2\text{S}$ ### Section E 10. Aluminum + Chlorine - Formula: $\text{AlCl}_3$ -…
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using your science notebook and interactive word wall, review what you …
By comparing structure (packing/order), shape (definite vs. adaptive), kinetic energy (motion intensity), and volume (definite vs. expandable) of atoms/molecules: - Solids: Closel…
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5 calcium fluoride 6 lithium oxide explain: choose one compound above a…
1. Calcium fluoride formula: $\text{CaF}_2$ 2. Explanation: Calcium forms a +2 cation ($\text{Ca}^{2+}$), fluorine forms a -1 anion ($\text{F}^-$). To achieve a neutral compound (…
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5 calcium fluoride 6 lithium oxide explain: choose one compound above a…
### Top Compounds & Explanation: 5. Calcium fluoride: $\text{CaF}_2$ 6. Lithium oxide: $\text{Li}_2\text{O}$
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1. a teacher has given a student a white powder sample and asks her to …
\( \approx 60.0 \, \text{g} \) ### Problem 2
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2. a chemistry instructor provides a student with a clear crystalline s…
$\approx 161\ \text{g}$ ### Problem 3
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any characteristic of a substance, such as flammability, that can be ob…
A. Chemical Property
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homogeneous mixture that remains constantly and uni - formally mixed an…
B. Solution ### Second Question (Tendency for light to scatter...):
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any characteristic of a material, such as size or shape, that can be ob…
C. Physical Property
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substance containing two or more components that are blended uniformly …
A. Homogeneous Mixture ### Second Question
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mixture whose particles never settle * colloid suspension law of conser…
A. Colloid ### Second Question (Substance with atoms that are all alike)
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process that can separate two substances in a mixture by evaporating a …
C. Distillation ### Second Question:
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any change in size, shape, or state of matter in which the identity of …
D. Physical Change ### Second Question:
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substance in which the atoms of two or more elements are combined in a …
C. Compound
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directions: for the following questions, choose the best answer or resp…
D. The beauty of winter creates calm. ### Question 2 (Part B)
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7. what does it mean for an ionic compound to be eutral overall\? part …
### Question 7: An ionic compound is "neutral overall" when the total positive charge from its cations is equal to the total negative charge from its anions, resulting in a net ch…
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37) 16 the reaction between hydrogen and oxygen releases 486 kj/mol of …
C 498 kJ/mol ### Question 38
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it is not enough to simply purchase foods that are high in complex carb…
prepared in a way that preserves nutrients
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multiple choice question complex cognitive structures that organize inf…
B. schemes
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click and drag on elements in order correctly order the steps necessary…
To solve this, we follow the logical order for stoichiometric calculations with limiting reactants: ### Step 1: Balance the chemical equation A balanced chemical equation is essen…
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question 10 for a solid to become a gas, energy must be .
absorbed (or added)
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unit test: states of matter started: jan 26 at 9:49am quiz instructions…
it's a measure of the movement of a substance's molecules
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when energy is absorbed, in an endothermic reaction, the container wher…
False
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question 6 what is the term for a reaction where energy is released? fu…
exothermic
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match each molecule with its atomic model. ethane (c₂h₆) methane (ch₄) …
- ethane (\(C_2H_6\)) → the model with two black carbon atoms and six white hydrogen atoms. - methane (\(CH_4\)) → the model with one black carbon atom and four white hydrogen ato…
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match the chemical formula with the appropriate model. methane (ch₄) me…
To solve this problem, we analyze the molecular structure of each compound: ### Methane ($\boldsymbol{CH_4}$) Methane has 1 carbon atom bonded to 4 hydrogen atoms. The second mode…
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question 2 when a solid is melting, the temperature will not rise until…
True
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multiple-choice question rhythm is the ______ in poetry. □ rhyme scheme…
D. beat (assuming the last option is labeled D, with text "beat")
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question 7 (10 points) listen water is a liquid at room temperature. th…
hydrogen bonding between water molecules.
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question 5 (10 points) listen which of the following statements correct…
polar covalent bonds because oxygen is more electronegative than hydrogen
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ch₄n₂o which structure could be used to represent urea? a image b image…
C. The structure with one gray (C), two blue (N), one red (O), and four white (H) atoms.
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question 3 (10 points) atoms that gain or lose electrons are known as: …
ions
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buffers are strong acids or bases. keep the ph within normal limits. lo…
keep the pH within normal limits.
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the chemical formula for methanol is ch₃oh. which of the following mode…
D
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match the chemical formula with the appropriate model. methane (ch₄) me…
To solve this, we analyze each compound's structure: 1. **Methane (CH₄)**: Has 1 C and 4 H. The model with 1 black (C) and 4 gray (H) atoms (second model) matches. 2. **Methanol (…