Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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learning: molecules and compounds calculationsquestion ⓘthe empirical f…
$\text{C}_{20}\text{H}_{16}\text{O}_4$
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learning: molecules and compounds calculations question ① the empirical…
C. $\text{C}_2\text{H}_6$
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learning: molecules and compounds calculations question ⓘ the empirical…
SF₆
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2) $ce{na3(po4) + k(oh) -> na(oh) + k3(po4)}$ before chem rxn after che…
$\boldsymbol{1}\text{Na}_3(\text{PO}_4) + \boldsymbol{3}\text{KOH} ightarrow \boldsymbol{3}\text{NaOH} + \boldsymbol{1}\text{K}_3(\text{PO}_4)$
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use the diagraming method to balance the following chemcial equations. …
$\ce{2Ag(NO3) + Cu -> Cu(NO3)2 + 2Ag}$ (The coefficients are 2, 1, 1, 2 respectively)
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to keep water from being polluted, individuals can a use chemicals in t…
d. All of these
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the periodic table directions: use chapter 3 section 2 and the periodic…
1. 3, 4, 5, 6, 7, 8, 9, 10 2. Li, Be, B, C, N, O, F, Ne 3. Lithium (Li), Beryllium (Be) 4. Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne) 5. Lithium (Li)…
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which examples show how communities can pollute the water supply? selec…
a. Incorrect disposal of harmful chemicals b. Chemicals are used on people's yards. c. Dumping things into storm drains. d. Wastewater that isn't treated enough
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9. base your answer(s) to the following question(s) on the information …
El porcentaje de masa de arsénico en la arsenopirita es aproximadamente $\boldsymbol{46.0\%}$ (o 46.01% con mayor precisión), con la configuración numérica $\frac{74.92}{55.85 + 7…
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bioremediation and ________ remediation are the two types of remediatio…
c. Chemical
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this form of remediation involves injecting microorganisms into the con…
b. Bioremediation
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to do chemical remediation of an acidic pollutant in an aquifer, introd…
a. A safe basic compound
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which form of remediation involves pumping a chemical into an aquifer t…
b. Chemical remediation
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8. the percent by mass of water in the hydrate $ce{na_{2}so_{4}cdot 10h…
C. 56% ---
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1. the percentage by mass of br in the compound $albr_3$ is closest to …
1. D. 90.% 2. A. $\frac{24}{184} \times 100$ 3. B. 35.0% 4. B. 15.8% 5. B. 27.6% 6. A. BeO 7. B. 43.2%
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fill in the blanks. you do not need a copy of the periodic table. use w…
### Row 1 (Period 1) | Property | H | He | |-------------------|---|----| | Protons (+) | 1 | 2 | | Total Electrons | 1 | 2 | | Valence Electrons | 1 | 2 | | Energy Shells | 1 | 1…
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question 39 of 60 > why can a molecule be considered nonpolar even thou…
The molecule has a symmetrical shape.
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question 38 of 60 which of these compounds has a polar covalent bond? h…
A. HF
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question 37 of 60a water molecule consists of an oxygen atom and two hy…
Water is polar, which means it has an uneven distribution of charge, making it a good solvent of other polar molecules.
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question 36 of 60 in a ball-and-stick model of a molecule, what does th…
Chemical bond between atoms
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question 35 of 60 how many total valence electrons are in the $\text{cs…
16
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question 34 of 60octane, $ce{c8h18}$, spreads out on waxed paper. do yo…
No, octane will not dissolve in water because octane is nonpolar, and water is polar.
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question 33 of 60 which of these atoms attracts shared electrons the mo…
N
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question 33 of 60 which of these atoms attracts shared electrons the mo…
O N
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question 32 of 60 select the nonmetal elements that combine with two hy…
O. O, S. S
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question 31 of 60 for each molecule, specify the polarity of the bonds …
1. $\text{BeCl}_2$ - bonds: Polar - molecule: Nonpolar 2. $\text{H}_2\text{O}$ - bonds: Polar - molecule: Polar 3. $\text{O}_2$ - bonds: Nonpolar - molecule: Nonpolar
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draw the molecules. write the balanced equation at the bottom $ce{h_{2}…
Balanced equation: $2\text{H}_2\text{O} ightarrow 2\text{H}_2 + \text{O}_2$ (For molecule drawings: - $\text{H}_2\text{O}$: An oxygen atom bonded to two hydrogen atoms in a bent s…
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draw the molecules. write the balanced equation at the bottom $ce{sno_{…
$\text{SnO}_2 + 2\text{H}_2 ightarrow \text{Sn} + 2\text{H}_2\text{O}$ *(Note: For drawing molecules: $\text{SnO}_2$ is a solid network structure, $\text{H}_2$ is a diatomic molec…
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draw the molecules. write the balanced equation bottom $ce{sno_{2} + h_…
Balanced chemical equation: $\boldsymbol{\text{SnO}_2 + 2\text{H}_2 ightarrow \text{Sn} + 2\text{H}_2\text{O}}$ ### Molecular Structures (Simplified): - $\text{SnO}_2$: Tetrahedra…
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5. when 75 ml of 0.020 m $\text{pb(no}_3\text{)}_2$ is mixed with 25 ml…
Since the ion product $Q = 9.375 \times 10^{-8}$ is less than the solubility product constant $K_{sp} = 1.7 \times 10^{-5}$, no precipitate will form.
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draw an example showing reactants and products
Here is a diagram of a reaction with labeled reactants and products: ``` Reactants Products 2H₂(g) + O₂(g) → 2H₂O(l) [Hydrogen gas] + [Oxygen gas] → [Liquid water] ``` (Visual rep…
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10 multiple choice 1 point using the equation $ce{c_{12}h_{22}o_{11} + …
0.580 mol
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endothermic reaction define a chemical reaction that absorbs heat from …
``` Energy | | Products: C₆H₁₂O₆ + 6O₂ | ● | / \ | / \ Activation Energy | / \ | / \ | / \ | ● Reactants: 6CO₂ + 6H₂O | ─────────────────────────────────── Reaction Progress ↑ ΔH …
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endothermic reaction exot define: define a che be exam example: draw: d…
1. **Define**: A chemical reaction that absorbs heat from its surroundings, with a positive change in enthalpy ($\Delta H > 0$). 2. **Example**: Photosynthesis: $6\text{CO}_2 + 6\…
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5. draw a quick plot of concentration vs. time in minutes for a second …
1. (Question 5 plot description): The plot of concentration vs. time for a second-order reaction will be a downward-curving hyperbola, starting at [CV] = 0.10 M at t=0, decreasing…
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4. the value of the solubility product constant, ksp, for silver carbon…
a. $\text{Ag}_2\text{CO}_3(s) ightleftharpoons 2\text{Ag}^+(aq) + \text{CO}_3^{2-}(aq)$ b. $2.53 \times 10^{-4}\ \text{mol/L}$
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your friend says: “when i light a piece of paper on fire, its particles…
When you light a piece of paper on fire, its particles are not destroyed but are transformed into other substances like ash, carbon dioxide, and water vapor that still exist in th…
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2. how will the absorbance readings change as the crystal violet is use…
Decrease
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what advice would you give your younger self? some advice i would give …
1. Color change (e.g., rusting iron turning reddish-brown) 2. Production of a gas (e.g., bubbles from baking soda and vinegar) 3. Formation of a precipitate (e.g., solid settling …
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name. emma green date: section:all information needed to complete this …
The sodium hydroxide solutions are relatively nonhazardous because they are used in very dilute concentrations, which significantly reduces their caustic and corrosive properties.
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identify all of the chirality centers in the structure. the chirality c…
A. A, B. B, C. C, G. G, H. H, I. I, J. J, M. M, N. N, O. O, P. P, R. R
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answer all parts of all questions and show all work ftext cut offcoeffi…
1. **Define**: A reaction that releases energy (heat/light) to the surroundings, where $\Delta H = H_{products} - H_{reactants} < 0$. 2. **Example**: $\ce{CH4(g) + 2O2(g) -> CO2(g…
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decide whether each sentence is punctuated correctly. use the drop-down…
1. no revision needed 2. remove comma after sisters 3. add a comma after chemistry
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earth has two poles: the north pole and the south pole. as shown in the…
B. A distinct end or side
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decide whether each sentence is punctuated correctly. use the drop-down…
1. no revision needed 2. add a comma after chemistry
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draw valid resonance structures for the compound shown below
The valid resonance structures (from left to right, including the given structure) are: 1. $\text{CH}_3-\text{C}^+=\text{CH}-\text{CH}=\text{CH}_2$ 2. $\text{CH}_3-\text{CH}=\text…
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worksheet - chapter 7 (all sections) and chapter 9 (9.1, 9.2 & 9.4 only…
### Vocabulary Definitions: 1. Alloys: Homogeneous mixtures of metals (or metal + non-metal) with enhanced properties. 2. Chemical formula: Notation using element symbols and subs…
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list the name and position for each substituent in this organic molecul…
| name | position | |------|----------| | methoxy | 3 | | methyl | 5 | | propoxy | 7 |
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read this excerpt from the canterbury tales by geoffrey chaucer.1 whan …
alliteration
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c. which substituent has higher priority? $ce{(ch3)c(=o)-}$ $ce{-c#n}$
The acetyl group ($\boldsymbol{\text{-C(O)CH}_3}$) has higher priority.
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multiple choice question how does an electrical outlet produce an elect…
As soon as a device is plugged in, the potential difference pushes electrons towards the device.
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for each pair of substituents, select the higher priority substituent a…
A. $\boldsymbol{\ce{-CH=CH2}}$ (the vinyl substituent) B. $\boldsymbol{\ce{-CH2CH2CH2Br}}$ (the terminal bromine-containing substituent)
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question 4 of 45 consider the structure of cholesterol. identify the nu…
8 *Note: Upon precise count of the unique chiral centers in the cholesterol structure, the correct number of asymmetric carbon atoms is 8.*
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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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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…
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heat transfer in earths systems understanding heat movement the sun pow…
1. Radiation 2. Conduction
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which item is not used by lady macbeth as a symbol in lines 58-67? sele…
1. b. flower 2. b. She wants to be in charge of tonight's major scheme.
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5. biomass energy is derived from what? nuclear waste byproducts. organ…
Organic materials like plants.
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name:period:date:chemistry testbalancing & types of chemical reaction**…
1. SR (Single Replacement) 2. D (Decomposition) 3. C (Combustion) 4. S (Synthesis) 5. DR (Double Replacement) 6. D (Decomposition) 7. C (Combustion) 8. SR (Single Replacement) 9. …
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directions: create a bohr model of an atom by dragging each subatomic p…
- Nucleus (inner blue circle): 13 protons, 14 neutrons - Innermost orbit: 2 electrons - Middle orbit: 8 electrons - Outermost orbit: 3 electrons
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what does the temperature of a substance directly measure? the chemical…
The average kinetic energy of its particles
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6. how many hydrogen atoms are present in one formula unit of ammonium …
6. b. 8 7. a. 1:1. 8. d. 54.94 g/mol. 9. b. 41.99 g/mol. 10. d. 342.17 g/mol.
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1. the atomic number of neon is 10. what is the average atomic mass of …
1. c. 20.180 amu 2. a. 27.94 amu 3. c. 10.812 amu 4. d. hydrogen has more than 1 isotope. 5. c. 6 mol H
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name:the road not takenby robert frosttwo roads diverged in a yellow wo…
1. ABAAB 2. "In leaves no step had trodden black" 3. First-person point of view 4. "Because it was grassy and wanted wear" 5. "Because it was grassy and wanted wear" 6. Reflective…
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name:period:the road not takenby robert frosttwo roads diverged in a ye…
1. $A,B,A,B,B$ 2. "In leaves no step had trodden black." 3. First-person (I/me/my perspective) 4. "Because it was grassy and wanted wear," 5. "Because it was grassy and wanted wea…
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1. when the molecules of gases are heated, the average kinetic energy o…
1. True 2. True 3. True
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what does the creature think causes felix, agatha, and delacey to be un…
1. c. The hardship of poverty. 2. b. Lucretius
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why are physical properties such as hardness or cleavage useful to geol…
D. Physical properties are unique to each mineral and are determined by the mineral's chemical composition and atomic structure
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level: 3 challenge 5 of 5 score: 5 start over $4\\ nh_3 + 6\\ no \ ight…
- $\text{N}_2$: 5 - $\text{H}_2\text{O}$: 6 - Leftover $\text{NH}_3$: 0 - Leftover $\text{NO}$: 0 The product box should contain 5 $\text{N}_2$ (blue-blue molecules) and 6 $\text{…
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a sample contains carbon and hydrogen in the amounts shown in the data …
D. 25%
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a 48 g sample is composed of 38 g of fluorine (f) and 10 g of boron (b)…
79%
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which element does the electron configuration $1s^22s^22p^2$ represent?…
C. C
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identify the following as an element or compound. chromium(ii) oxide (c…
compound
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in which block of the periodic table is uranium (u) found? ○ s block ○ …
f block
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how is this substance classified? it has the formula xz. a homogeneous …
a compound
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which of these techniques can be used to effectively separate an undiss…
settling, then decantation
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unit exam - matter and change what separation technique is illustrated …
evaporation
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which of these mixtures would best separate using distillation?powdered…
honey and tea
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which is the electron configuration for lithium? 1s² 2s³ 1s²2s¹ 1s¹2s²
): $1s^2$ ## Step3: Remaining electron to 2s orbital 1 electron left, fills the 2s orbital: $2s^1$ ## Step4: Combine orbitals Combine to get full configuration: $1s^22s^1$
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which element has 32 protons in its nucleus?○ phosphorus○ cobalt○ germa…
germanium
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what technique effectively separates mixtures of liquids that have diff…
distillation
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what did kittys mother mistakenly think was causing the unusual smell a…
Roasting chickens
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classify the following as a heterogeneous mixture (suspension), homogen…
heterogeneous mixture (suspension)
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which substance is a mixture? ○ table salt ○ gasoline ○ aluminum ○ carb…
gasoline
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air is made up of different gases, such as oxygen, nitrogen, and carbon…
compound substance; all meet the definition of pure substances (uniform, unchanging composition). The other options are incorrect: these substances can react with other chemicals …