化学
化学反応、化学量論、分子構造、元素の性質。
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passage 1 passage 2 excerpt from society and solitude by ralph waldo em…
Friendship is considered to be valuable but not necessarily vital.
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when biogeochemical cycles are impacted by humans, they tend to destabi…
positive feedback loop
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question 2 of 10 in what way is the modernist element of disillusionmen…
D. Prufrock feels isolated, even in the company of others
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choose the correct answer. why is water considered to be a \universal s…
It can dissolve many things.
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what happens during evaporation? water falls to earth as rain or snow. …
Water turns from liquid to gas and rises into the air.
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for the following formula, match the definition to the numerical value:…
| Element Symbol | Coefficient | Subscript | Total # of Al atoms | Total # of S atoms | | --- | --- | --- | --- | --- | | \(Al\) | \(4\) | \(2\) (for \(Al\)), \(3\) (for \(S\)) | …
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match the following reactions to the correct description combustion ch₄…
- \(CH_4 + 2O_2 ightarrow CO_2+2H_2O\): combustion - \(HCl + KOH ightarrow KCl + H_2O\): double replacement - \(Ba+MgSO_4 ightarrow BaSO_4 + Mg\): single replacement - \(2H_2O igh…
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match the example with the type of change rusting metal broken pencil f…
- Chemical change: Rusting Metal, Fire, Digesting food - Physical change: Broken Pencil, Boiling Water, Hair Cut
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what is the correct coefficient ratio to have the equation balanced? ag…
1:1:1:1 (the third option)
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what is the correct coefficient ratio to have the equation balanced? mg…
1:2:1:1
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match the following chemical as either a reactant or a product: mg + hc…
Reactant: \(Mg\), \(HCl\); Product: \(MgCl_{2}\), \(H_{2}\)
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in addition to having a unique name and atomic number, every chemical e…
The atomic symbol \( \text{Ni} \) represents the chemical element \( \text{nickel} \).
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the number of protons in an atom is known as its atomic number. atoms t…
Lithium's atomic number is \(3\). The first model (with 3 protons) also represents a lithium atom.
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there is a law that explains that matter cannot be created nor destroye…
Law of Conservation of Matter
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below are two atomic models. each model represents a different atom. co…
protons
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part b would the volume be different if the gas was argon (under the sa…
The volume would be the same if the gas was argon because the ideal gas law is dependent on the number of moles of the gas and not the mass.
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18 elección múltiple 1 punto which of these is a homogeneous mixture? c…
tea ### Question 19
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a chemistry professor is preparing a lesson on the phases of matter. re…
- First row: Definitions - Second row: Examples
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missed this? watch kcv: simple gas laws and ideal gas law, we ideal gas…
\(V = 2.6\space L\)
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part a missed this? watch kcv simple gas laws and ideal gas law; read s…
\(226\space mL\)
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a syringe containing 1.75 ml of oxygen gas is cooled from 92.3 °c to 0.…
$1.31$
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protons and neutrons are found in the nucleus of an atom. traveling aro…
- An electron has a negative electrical charge. - All of an atom's electrons are located outside its nucleus.
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missed this? watch kcv: simple gas laws and ideal gas law; read section…
$56.9\text{ mL}$
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almost all of an atoms mass is found in its nucleus, located in the cen…
1. False 2. True 3. True 4. True
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missed this? watch kcv: simple gas laws and ideal gas law; read section…
\(1.65\) atm
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though they are too small to see without a special microscope, atoms ma…
Atoms make up every substance around you.
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the model below represents ferrous oxide. ferrous oxide makes up about …
a compound
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the model below represents a molecule of oxygen. billions of pounds of …
an elementary substance
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15-détermine sil sagit dun changement chimique ou physique. découper un…
| | Physique | Chimique | | --- | :---: | :---: | | Découper une feuille de papier | ✔️ | | | Plier un carton | ✔️ | | | Dissoudre du sel dans l'eau | ✔️ | | | Une bûche qui brûle…
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the model below represents silicon carbide. silicon carbide is a hard s…
a compound
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the model below represents silver. silver is a precious metal that is u…
an elementary substance
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the model below represents a molecule of sulfur dioxide. sulfur dioxide…
a compound
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the model below represents calcium oxide. calcium oxide is used to make…
a compound
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the model below represents a molecule of propane. propane is used as fu…
a compound
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the model below represents a molecule of chloromethane. chloromethane i…
a compound
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the model below represents a molecule of trichlorofluoromethane. trichl…
a compound
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in 22 and 23, use the diagram at the right. 22. at what times between 1…
10:00 A.M., 10:30 A.M., 11:00 A.M., 11:30 A.M., 12:00 P.M., 12:30 P.M., 1:00 P.M., 1:30 P.M., 2:00 P.M., 2:30 P.M., 3:00 P.M., 3:30 P.M., 4:00 P.M., 4:30 P.M. ### 23.
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list any safety concerns for the burning of magnesium or mg + o₂ → mgo
- **Eye protection**: The bright light from burning magnesium can harm the eyes. - **Heat and burn risk**: The burning magnesium and the resulting magnesium oxide are hot and can …
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the model below represents a molecule of ethanol. ethanol can be used a…
a compound
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the model below represents a molecule of hydrogen. hydrogen gas was onc…
an elementary substance
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what is the correct coefficient ratio to have the equation balanced? (n…
1:1:2:1
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14-de quel changement de phase est-il question? (question il est sous q…
a) Fusion (solide → liquide) b) Condensation (gaz → liquide) c) Solidification (liquide → solide) d) Évaporation (liquide → gaz) e) Sublimation inverse (gaz → solide) f) Sublimati…
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the different colored squares on the periodic table show elements that …
Mercury (Hg)
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the number in each square of the periodic table tells us the atomic num…
Sulfur (S)
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what is the correct coefficient ratio to have the equation balanced? pb…
1:2:2:1
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alternative swyk: reactions lab match the following chemical as either …
Reactant: \(Pb(NO_3)_2\), \(KI\) Product: \(PbI_2\), \(KNO_3\)
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the capacity to do work as a result of position or state is known as___…
- First question: Potential energy - Second question: Potential energy
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the capacity to do work as a result of position or state is known as___…
1. Potential energy 2. Potential energy 3. 1. oxidation; 2. reduction
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take quiz the capacity to do work as a result of position or state is k…
- Question 5: Potential energy - Question 6: 1. oxidation 2. reduction
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which pair of elements will form an ionic bond? n and o c and cl k and …
K and Br
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pbf: benefits and limitations use the information below to answer the q…
The prints are dense.
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which of these best describes an ionic bond? a force that keeps two lar…
a force that holds two oppositely charged ions together
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question 21 (1 point) what is the product of 11.24 and 1.9501 written w…
B. \(21.92\)
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which pair of ions can form an ionic bond with each other and why? cu+ …
$Li^{+}$ y $Br^{-}$; Tienen cargas opuestas.
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which statement describes a step in the formation of an ionic bond? a m…
A metal atom forms a cation, and a nonmetal atom forms an anion.
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pbf: benefits and limitations use the information below to answer the q…
The machines have a small build bed.
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which statement indicates that a substance may be an ionic compound? it…
It is made up of a crystal lattice.
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which of these can easily form an ionic bond with a cation? ne nh₄⁺ sr …
$PO_{4}^{3 - }$
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what leads to the formation of an ionic bond with hg²+? the attraction …
the attraction of an $SO_{4}^{2 - }$ ion
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determining characteristics of ionic compounds which of these character…
- are good conductors of electricity when dissolved in water - have high melting and boiling points - are hard
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determining characteristics of ionic compounds lattice energy is an est…
strength
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describing the structure of ionic compounds how many hydroxide ions are…
3
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describing the structure of ionic compounds consider the compound al(oh…
crystal lattice
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determining formulas for ionic compounds click here to view a list of t…
\(KOH\)
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7 a balloon filled with room temperature air and then put in a sunny pl…
7. LIGHT GREEN; 8. DARK BLUE
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determining formulas for ionic compounds click here to view a list of t…
\((NH_4)_2SO_4\)
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4. a chemical reaction produces a pure, unknown element. describe two d…
- Density measurement: Calculate density (mass/volume) and compare with known values. - Flame test (for metals): Observe flame color when heated.
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3. what makes transition metals unique in terms of their valence electr…
Transition metals are unique in terms of valence electrons because they have valence electrons in both \(s\) and \(d\) orbitals (while main - group elements typically have valence…
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use the following image for questions 1 and 2. 1. which element will mo…
Aluminum (Al). Because elements in the same group (group 3A) have similar chemical properties. ### Question 2
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which of the following molecules would you expect to have sp hybrid orb…
\(CO_2\)
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question 19 what is the electron group arrangement and molecular shape …
trigonal planar; trigonal planar
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what is the predicted bond angle for so₂? 180° < 109.5° 120° < 120°
\(< 120^{\circ}\)
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8) as shown below, an empty 1,000 - milliliter container has a mass of …
B. \(1.05\space g/mL\)
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the graph was drawn from data collected as a substance was heated at a …
definite; definite; heat (thermal energy); move (vibrate); temperature; 70; melt; melted; liquid; definite; no definite; solid; liquid
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phase change descriptions: melting the change from solid to liquid. fre…
Condensation: the change from gas to liquid. Sublimation: the change from solid to gas. Deposition: the change from gas to solid.
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describe your own examples of a homogeneous and heterogeneous mixture, …
Homogeneous mixture example: Saltwater. It is classified as such because the salt is evenly distributed in the water. Heterogeneous mixture example: Sand - water mixture. It is cl…
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question 17 rank the following according to increasing bond polarity (i…
$\text{F - F}<\text{F - I}<\text{F - Br}<\text{F - Cl}$
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sasha prepares a fruit drink in the morning. she stirs flavored powder …
The fruit drink is a heterogeneous mixture. This is because the chopped - up fruit is not uniformly distributed and is a distinct component (phase) within the drink, while the fla…
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read the passage from a letter that president jimmy carter wrote to con…
Protecting the environment is essential for maintaining Americans' quality of life.
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some elements can only exist in pairs. one example is oxygen, which is …
No, \(O_2\) is not a compound. A compound requires two or more different elements, but \(O_2\) has only one element (oxygen).
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some elements can only exist in pairs. one example is oxygen, which is …
No, \(O_2\) is not a compound. A compound requires two or more different elements. \(O_2\) has only oxygen atoms (one type of element), so it is an element (a diatomic molecule of…
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2. an unknown piece of metal weighing 95 g is heated to 98°c. it is dro…
The specific heat of the metal is \(0.96\space J/g^{\circ}C\)
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which of the following might represent the empirical formula for a comp…
\(CH_2O\)
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carbon capture and storage (ccs) carbon sequestration imagine your plan…
Once captured, the CO₂ is compressed and then transported to a safe and permanent storage location.
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greenhouse gas defining key terms what term is used to describe the abi…
greenhouse warming potential
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gas stoichiometry use ( pv = nrt ) to solve for the volume of one mole …
\(0.0781\space mol\) (rounded to four - significant figures)
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which is the correct orbital energy diagram for nitrogen?
The orbital energy diagram with \(1s\) (two electrons with opposite spins), \(2s\) (two electrons with opposite spins), and \(2p\) (three electrons, one in each of the three \(2p\…
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question 3 20 points chemistry deals with: a the composition of and cha…
D. the composition and changes of substances that make up living as well as non - living matter
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question 1 the atoms of different elements have: a the same atomic numb…
D. different atomic numbers
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when a commercial landfill becomes full, what happens next, according t…
A plastic cover, dirt, and grass seeds are added.
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\phytoremediation\ is when plants are used to remove toxic waste from s…
It is a relatively cheap method of cleaning up hazardous waste.
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the \atomic number\ of an atom is determined by the number of ________ …
D. protons
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types of hazardous waste hazardous waste encompasses a range of materia…
reactive waste
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an atom of iron has an atomic number of 26. which of the following is t…
D. iron has 26 protons
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the smallest particle of an element that still exhibits the chemical ch…
C. atom
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question 1 which of the following best describes a proton? a one positi…
A. one positive charge, mass of one, found in nucleus
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non - point source pollution pollution comes from various factors like …
because it comes from multiple sources that are hard to pinpoint
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at what temperature does water begin to boil? 150 degrees celsius (302°…
100 degrees Celsius (212°F)
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at what temperature does water turn from liquid to steam? 0°f 212°f 50°f
212°F
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the ideal gas law four quantities describe the state of a gas: pressure…
The new volume of the methane gas is approximately \(4.9\space L\).