Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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environmental science swt #2 1. sustainability is making sure that the …
1. a. True 2. a. environment 3. a. Space Exploration 4. None of the above (The Tragedy of the Commons is when individuals over - use a shared resource for their self - interest, d…
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directions: go to schoology and open up the big bang folder. use nasa’s…
The Big Bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single singularity then exploded and stretched to grow as larg…
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q.7. write the z, a, number of subatomic particles in the following: | …
| | Ca | Ca²⁺ | S | S²⁻ | |--|--|--|--|--| | Z | 20 | 20 | 16 | 16 | | A | 40 | 40 | 32 | 32 | | #Protons | 20 | 20 | 16 | 16 | | # Neutrons | 20 | 20 | 16 | 16 | | # Electrons | …
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what must differ between the atom of two different elements? o electron…
protons in the atom
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which components of the atom have a positive charge? neutrons protons e…
B. protons
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what is the smallest unit that makes up matter? o molecules o chemicals…
D. atoms
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complete the following table. |formula|lewis structure|polar? y/n|imfs|…
| Formula | Lewis Structure | Polar? Y/N | IMFs | | ---- | ---- | ---- | ---- | | PCl₃ | P with 3 single bonds to Cl and 1 lone - pair | Y | Dipole - dipole, London dispersion | |…
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which statement best describes the arrangement of electrons in an atom …
There are two electrons in the first energy level and seven electrons in the second energy level.
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which element has atoms with valence electrons in a higher energy level…
Cesium (Cs)
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engine coolant chemicals: are considered toxic and children or pets may…
True
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6. for each of the four molecules below, complete the following: a. dra…
Ethane: Non - polar; Carbon dioxide: Non - polar; Methanol: Polar; Water: Polar; Oxygen: Non - polar; Methylamine: Polar; Acetic acid: Polar
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helium is in group 18 of the periodic table. how is helium different fr…
Helium atoms have 2 valence electrons in the first energy level, while atoms of the other elements in the group have 8 valence electrons in the second (or higher) energy level.
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two representative elements, nitrogen and oxygen, are in the same perio…
They have valence electrons in the same energy level.
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how many valence electrons does each atom of arsenic (as) have? arsenic…
5
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question 4 if the atomic radius of a metal that has the body - centered…
$0.033$
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surface tension: go to the following link (you may have to sign in with…
7. After conducting the experiment on the website, the substance with the highest number of drops before spilling (and thus the highest surface - tension) is usually water. 8. Wat…
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evaporation rate: watch this video and answer the following questions: …
4. Acetone 5. Water 6. Acetone evaporates fastest as it has only dipole - dipole forces. Ethanol has hydrogen bonding and dipole - dipole forces, so it evaporates slower than acet…
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1. what happened when the charged balloon was brought near water? 2. wh…
1. The stream of water bends towards the charged balloon. 2. There is no noticeable effect on hexane. 3. Water is polar (due to its Lewis - structure based dipole moment) and is a…
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nutrient cycling 1. what is the law of conservation of matter? 2. which…
1. Matter cannot be created or destroyed in a chemical reaction, only changed in form. 2. Carbon, nitrogen, phosphorus, water.
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the video tells us that the mantle of the earth today is , and the core…
solid; liquid outer and solid inner
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another nonsilicate mineral is called pyrite. now, do a quick search on…
C. iron and sulfur
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acetone (ch₃coch₃) ethanol (ch₃ch₂oh) lewis structure polar? y/n interm…
| | Acetone ($CH_3COCH_3$) | Ethanol ($CH_3CH_2OH$) | |--|--|--| | Lewis Structure | Central carbon of $C = O$ bonded to two $CH_3$ groups; carbon - oxygen double bond, carbon - h…
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(u3:1) build an atom - phet virtual lab learning goals: review of atoms…
- What is an atom? An atom is the fundamental unit of matter, composed of sub - atomic particles including protons, neutrons, and electrons. - Difference between an atom and an el…
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lewis structures: complete the table | | water (h₂o) | hexane (ch₃ch₂ch…
| | Water ($H_2O$) | Hexane ($CH_3CH_2CH_2CH_2CH_2CH_3$) | |--|--|--| | Lewis Structure | H - O - H with two lone - pairs on oxygen | Chain of six carbon atoms with appropriate hy…
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5. for each of the following molecules in the table below, determine if…
| Molecule | Electronegativity Values | Difference in Electronegativity | Bond Type | | ---- | ---- | ---- | ---- | | H - Cl | H: 2.1, Cl: 3.0 | 0.9 | Polar | | H - H | H: 2.1, H:…
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select all the correct answers. when wax is heated, it turns into a liq…
The molecules gain energy. The space between the molecules increases.
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select the correct answer from each drop - down menu. a molecule of chl…
Chlorine is an element. Carbon dioxide is a compound.
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match the vocab term with the definition. exothermic chemical change ph…
exothermic - When a substance releases energy, so it feels warm/hot chemical change - change that results in the formation of one or more new substances physical change - a change…
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how are elements in the same group on the current periodic table simila…
A. They have the same number of outermost electrons.
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how does sodium (na) compare to chlorine (cl) on the periodic table of …
A. Sodium (Na) is a highly reactive metal, while chlorine (Cl) is a highly reactive gas.
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select the correct answer. in his science class, mr brown heats a small…
E. sublimation
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3 li lithium 6.94 the element above has 6.94 protons, 3 elect
The element has 3 protons and 3 electrons.
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three metals from group 1 on the periodic table were tested for reactiv…
D. It increases down a group on the Periodic Table.
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three metals from group 1 on the periodic table were tested for reactiv…
D. It increases down a group on the Periodic Table.
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three metals from group 1 on the periodic table were tested for reactiv…
D. It increases down a group on the Periodic Table.
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three metals from group 1 on the periodic table were tested for reactiv…
D. It increases down a group on the Periodic Table.
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which best describes a solid produced in a solution during a chemical r…
D. precipitate
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which is indicated if a gas forms when two or more substances are mixed…
B. chemical change
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how would a scientist identify an element as a noble gas? a. the scient…
C. The scientist would show that the element is a nonmetal with 8 valence electrons.
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practice atom diagrams: fill in the missing information and draw the el…
| Element | Helium | Carbon | Fluorine | |--|--|--|--| | Electrons: | 2 | 6 | 9 | | Protons: | 2 | 6 | 9 | | Neutrons: | 1 | 5 | 8 | | Mass | 3 amu | 11 amu | 17 amu | | Charge | …
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which explains how the metalloids on the periodic table of elements are…
C. Metalloids all have metal and nonmetal properties.
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11 use the periodic table. match each statement with the proper classif…
contains many solids: Metals conducts electricity in the solid state: Metals tends to gain electrons and form negative ions: Nonmetals aluminum: Metals argon: Nonmetals
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drag each label to the correct category. human activities that do not c…
Eco - Friendly: recycling materials, growing trees, using fewer disposables Not Eco - Friendly: filling landfills, cutting trees, burning fossil fuels, burying organic matter
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66. what kind of tension is recommended to straighten the hair with blo…
66. Firm but gentle tension. 67. Fine, damaged, chemically - treated hair. Use lower heat and wide - tooth comb instead. 68. Close to the hair (about 1 - 2 inches) and follow the …
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the image shows a molecular model of a compound using balls and sticks.…
B. The balls must be the same color
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10 what is the correct ordering of the groups from left to right in the…
1. Alkali Metals 2. Transition Metals 3. Halogens 4. Noble Gases
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out of all the social media tools available today, the best place to st…
Marketing and advertising tools because they can help you identify people who are interested and talking about your brand.
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which of the following laboratory tools is used to grind chemical compo…
El mortero y pestillo (la última imagen)
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which of the following laboratory tools is used to grind chemical compo…
Mortero y pestillo (no se muestra en las opciones dadas, pero es la correcta; entre las opciones dadas, no hay la respuesta correcta)
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2. enumere tres isótopos estables y tres isótopos inestables que respal…
Isótopos estables: - ${}_{6}^{12}\text{C}$ - ${}_{8}^{16}\text{O}$ - ${}_{11}^{23}\text{Na}$ Isótopos inestables: - ${}_{92}^{238}\text{U}$ - ${}_{1}^{3}\text{H}$ - ${}_{6}^{14}\t…
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which of the following electron configurations is correct for nitrogen?…
A. \(1s^{2}2s^{2}2p^{3}\)
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which of the following laboratory tools is used together with filter pa…
Funnel
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which of the following is the noble gas notation shorthand for the elem…
a) [Ar] 4s²3d³, c) [Ar] 4s²4d³
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how many moles are in 36.04 grams of water (h2o)?
2 moles
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how many moles are in 30.04 grams of water (h2o)?
$1.67$ moles
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which of the following electron configurations is the correct one for t…
d) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
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fill in the name and empirical formula of each ionic compound that coul…
To determine the empirical formula and name of ionic compounds, we use the principle of charge balance (the total positive charge equals the total negative charge) and follow nami…
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2. the following measurements were made to determine the density of a m…
a. The accuracy is poor; trials show significant spread from the accepted value (1.15 g/mL). b. The precision is low as trials have a large range (0.95-1.26 g/mL). c. The percent …
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for each row in the table below, decide whether the pair of elements wi…
To solve this, we analyze each row based on element types (metals, non - metals, noble gases) and bonding rules: ### Row 1: Element #1 = Potassium (K, metal), Element #2 = Barium …
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multiply or divide the following measurements. be sure each answer you …
(First): \( 1771.61 \frac{\text{mol}}{\text{L}} \) ### Second Calculation: \( 0.93 \frac{\text{mol}}{\text{L}} \times 0.85 \, \text{L} \)
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which characteristic is given by the principal quantum number? ○ orbita…
A. orbital size
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the diagram below is a model of two solutions. each blue ball represent…
Solution A
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study the following phase diagram of substance x. use this diagram to a…
s: 1. For the first sub - question: The state of the sample is liquid. 2. For the second sub - question: The sample will vaporize (boil) (liquid→gas). 3. For the third sub - quest…
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rank the elements or compounds in the table below in decreasing order o…
1. B. HgCl₂ 2. A. H₂O₂ (Lewis structure H-O-O-H) 3. C. HCl 4. D. H₂ (already set as 4) (For the dropdowns: Highest boiling point is B (HgCl₂), next is A (H₂O₂), then C (HCl), then…
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read shakespeares \sonnet 100.\ where art thou, muse, that thou forget’…
cdcd
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she walks in beauty george gordon byron she walks in beauty, like the n…
D. 6 line stanzas in an ababab rhyme scheme
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what must happen before a chemical reaction can begin? ○ the activation…
B. The activation energy must be reached.
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select the correct answer from each drop-down menu. a reversible reacti…
reach equilibrium
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look at the chemical reaction. magnesium + hydrochloric acid → magnesiu…
- Magnesium ($\ce{Mg}$): Reactant - Hydrogen ($\ce{H_{2}}$): Product - Magnesium chloride ($\ce{MgCl_{2}}$): Product - Hydrochloric acid ($\ce{HCl}$): Reactant
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look at the chemical reaction. ammonium hydroxide → ammonia + water nh₄…
- Ammonia ($\ce{NH_{3}}$) is a **product** - Ammonium hydroxide ($\ce{NH_{4}OH}$) is a **reactant (or decomposing substance)**
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what is the benefit of using a shortcut in a reaction between two chemi…
- A reaction with a shortcut would yield more chemical output - A shortcut may provide a faster reaction - A reaction with a shortcut would require less chemical input
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worksheet #1 - protons, neutrons, and electrons practice worksheet fill…
To solve the worksheet, we use the following concepts: - **Atomic Number (Z)**: Number of protons (and electrons in neutral atoms). - **Mass Number (A)**: Sum of protons and neutr…
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11) match the illustrations with the states of matter.
To solve this, we analyze the particle arrangements for each state of matter: ### Step 1: Analyze the first illustration (above the cup) The particles are far apart, moving freely…
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the particles in the solid shown here are ______. distributed crystalli…
B. crystalline (assuming the options are labeled as A. distributed, B. crystalline, C. amorphous, D. luminous)
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which of the following chemicals, found in tobacco smoke, is als a. amm…
D. arsenic
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the particles in the solid shown here are ______. distributed crystalli…
B. crystalline
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snc2p chemistry 3. classify each of the materials below. in the center …
To solve this, we analyze each material based on the definitions: - **Pure Substance**: Made of one type of particle (element or compound). - **Mixture**: Made of two or more subs…
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what is the difference between an amorphous solid and a crystalline sol…
The correct option is the third one: "Amorphous solids have particles that are randomly arranged while crystalline solids have particles in" (assuming the full option would state …
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honey has a higher level of ______ than water, so it has a higher resis…
A. viscosity
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____ is the only substance to naturally exist in all three forms of mat…
C. Water
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5) match the descriptions with the states of matter. matter has a defin…
1. Matter has a defined shape and volume that will not change: Solid 2. Matter does not have a defined shape but still retains a defined volume and has viscosity: Liquid 3. Matter…
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part c in a separate location, take notes from the sources you’ve ident…
To complete the note - taking for the presentation, we analyze each topic using the provided sources: ### Topic: Chemical reactions of fossil fuels - **Source**: Combustion of Fue…
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the compound rule the physical and chemical properties of a blank have …
- First blank (after "a"): compound - Second blank (after "have"): nothing - Third blank (lower left): elements - Fourth blank (lower right): properties
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chemistry matter review practice name: blank 1. match each diagram with…
### Part 1: Matching Diagrams (Explanations for each match) 1. **Pure Element (only one type of atom)**: Diagram C has only one type of atom (all circles are the same), so match w…
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19) identify the properties listed below as properties of metals (m), o…
m #### b)
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match the following h₂ mgcl₂ bi hg n₂ i₂ c₆h₁₂o₆ b f₂ nacl h₂so₄
\( H_2 \) matches with the description of "Diatomic gaseous element (hydrogen gas)" (or equivalent based on full right - hand text). (Note: For the full set, each substance must b…
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• what is acid rain? which fossil fuel causes acid rain? what are the c…
- Acid rain: Precipitation (rain, snow, etc.) with pH < 5.6, containing sulfuric/nitric acids from air pollutants. - Fossil fuel: Coal (primarily, due to high sulfur), also oil/na…
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4) put a checkmark next to the description if its a chemical property o…
To solve this, we recall: - **Physical properties** can be observed/measured without changing the substance’s chemical identity (e.g., volume, color, mass). - **Chemical propertie…
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4) put a checkmark next to the description if its a chemical property o…
To solve this, we recall: - **Physical properties** are observed without changing the substance’s chemical identity (e.g., volume, color, mass). - **Chemical properties** relate t…
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match the following made of particles made of atoms made of molecules w…
To solve this matching problem, we analyze each term based on chemical concepts: ### 1. *Made of Particles* All matter (elements, compounds, mixtures) is made of particles (atoms,…
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a characteristic of matter is a(n) ______. ○ property ○ ability ○ mark …
A. property
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____ is anything known to have mass and that takes up space. a solid an…
C. Matter
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based on the electron configuration shown in the image, where on the pe…
Period 4 - The victim was not attacked by a cougar
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chemical reactions of fossil fuels - what kind of chemical reaction occ…
s: 1. The chemical reaction is combustion (oxidation - reduction). Products (besides energy) include $\ce{CO2}$, $\ce{H2O}$, and may include $\ce{CO}$, $\ce{SO2}$, $\ce{NO_x}$, so…
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the first stage in designing your presentation is to make a list of que…
Natural Science - Chemistry
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the first stage in designing your presentation is to make a list of que…
Since no specific question is provided (e.g., answering one of the listed questions, analyzing the research approach, etc.), it's not clear what the task is. If you want to answer…
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example 9 determine the molar mass of mg(no₃)₂.
The molar mass of \(Mg(NO_3)_2\) is approximately \(148.32\) g/mol (or \(148.3\) g/mol depending on rounding).
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carbon-14 has a half-life of 5,730 years. how long will it take for 112…
17,190 years
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complete the chart. get help here. columns: frying an isolated eggplant…
To solve this, we analyze each process: ### 1. Frying an Isolated Chicken - **Chemical makeup changes**: Yes (cooking involves reactions like Maillard, so chemical bonds change). …
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a meteorite contains 0.17 g of nickel-59, a radioisotope that decays to…
5