化学
化学反応、化学量論、分子構造、元素の性質。
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question 7 of 10 what is a water molecule made of? a. one oxygen atom a…
A. One oxygen atom and two hydrogen atoms
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question 6 of 10 if water were a nonpolar molecule, how would its prope…
C. Water would not stick together as well.
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fill in the blank question when water evaporates, the water molecules t…
evaporative cooling
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multiple - choice question the amount of energy required to remove a va…
C. Ionization energy
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11. atoms will emit light when a. an electron jumps from a lower energy…
11. C 12. C 13. B 14. B 15. b
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question 4 of 10 which kind of electrical charge is found on the oxygen…
A. A negative charge that exists because of a covalent bond with hydrogen
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question 3 of 10 which is an ion found in a glass of water? a. h⁻ b. oh…
B. $OH^{-}$
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question 2 of 10 examine the molecular models of two different substanc…
C. They are not attracted to each other, because one is polar and one is nonpolar.
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true or false question molecules that evaporate from a liquid to a gas …
False
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multiple select question select all that apply compared to ice crystals…
A. occupy less volume B. are placed nearer to each other D. move very quickly
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4. complete the table below based on the isotopes provided. assume all …
| Isotope | Isotope Notation | Atomic # | Protons | Electrons | Neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | | | \(_{15}^{30}P\) | 15 | 15 | 15 | 15 | | | \(_{36}^{84}Kr…
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how many elements is glucose (c6h12o6) made from? 2 3 4
3
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multiple - choice question where are the atoms with the highest atomic …
B. bottom left
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5. which electron configuration represents a violation of hunds rule fo…
D ### 6.
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use the answer choices below to answer the questions that follow. (a) ^…
1. B. \(^{9}Be\) 2. N/A (general statement, no specific answer from options) 3. C. \(_{4}^{9}Be^{2 +}\) 4. C. G & H 5. B. B & C & D
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multiple choice question identify a true statement about water molecule…
When water boils, nearly all the hydrogen bonds are broken, and many molecules enter the vapor state all at once.
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co₂ is a small molecule. how many elements make up one molecule of co₂?…
None of the provided options are correct. The correct answer is 2.
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multiple choice question after ice has melted, the added heat causes __…
C. an increase in the speed of molecular motion
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co₂ is a small molecule. how many atoms make up one molecule of co₂? 2 …
None of the provided options are correct. The correct answer is 3.
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when k and br2 react, the electron is lost by ____ and gained by ____. …
C. potassium, bromine
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3.2g of oxygen is ____ moles a 0.1 b 1 c 10 d 20 question 2 of 4
A. 0.1
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electron configuration and atomic spectra - test name: cristina garcia …
1. C. Br 2. B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}$ 3. C. $[Ar]4s^{2}3d^{7}$ 4. D. II and III
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fill in the blank question water freezes when the hydrogen bonds take o…
crystal lattice
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multiple choice question ____ has a higher latent heat of melting than …
C. Water
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multiple choice question identify a true statement about the changes ob…
The volume of water decreases.
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closure - exit ticket september 14/15, 2023 do you know the composition…
Element's symbol: U Atomic # : 92 Atomic Mass: 238.03 # of Protons: 92 # of Electrons: 92 # of Neutrons: 146 # of Valence electrons: 6
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use your knowledge of the periodic table, atomic number, and mass numbe…
| Symbol | Identity | Atomic # | Electrons | Neutrons | Charge | | ---- | ---- | ---- | ---- | ---- | ---- | | \(K^{+}\) | Potassium | 19 | 18 | 22 | +1 | | \(V^{2 +}\) | Vanadium…
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what factor determines how much linoleic acid can twist and bend its sh…
C. The number of carbon - carbon double bonds
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the ph scale is used to tell if a substance is an acid or base. substan…
B. acid
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which of the following is not a property of metals? malleable metallic …
C. poor conductors
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material density (g/cm3) aluminum 2.7 benzene 0.9 magnesium 1.7 water 1…
Benzene
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the ph scale is used to tell if a substance is an acid or base. substan…
B. A very strong acid
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copper is very ductile. what does this mean? it is very shiny. it can e…
It can be pulled into a wire easily.
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multiple select question select all that apply compared to ice crystals…
move very quickly, occupy less volume, are placed nearer to each other
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multiple choice question during the process of evaporation, the faster …
D. temperature
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what is a physical property of this yarn ball? the yarn ball is made of…
The yarn ball is a solid.
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station 4 magnesium isotopes: magnesium - 24 (78.7%), magnesium - 25 (1…
$24.325$
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the ph scale is used to tell if a substance is an acid or base. substan…
A. A very strong acid
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what indicator is used to measure acidity? litmus paper photo paper gra…
litmus paper
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which of the following is a base? lemon juice vinegar baking soda
Baking soda
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the ph scale ranges from 0 - 14 with acids having a low ph and bases ha…
The substance is most likely a base.
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what is the best definition for an acid? a substance that is neutral a …
a substance that releases hydrogen in water
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choose the correct answer. the ph scale how is pure water (in between t…
It is neither an acid nor a base because it is neutral.
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choose the correct answer the ph scale how are substances on the high e…
they are bases
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choose the correct answer the ph scale how are substances on the low en…
they are acids
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which of these are bases? tomatoes, lemon juice, vinegar, limes soaps, …
soaps, baking soda, bleach, antacids
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choose the correct answer. which of these are acidic? tomatoes, lemon j…
tomatoes, lemon juice, vinegar, limes
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choose the correct answer. what do bases taste like? sour bitter
bitter
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choose the correct answer. what do acids taste like? bitter sour
sour
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which of these do bases release in water? hydrogen ions (h+) hydroxide …
hydroxide ions (OH -)
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choose the correct answer. which of these do acids release in water? ni…
hydrogen ions (H⁺)
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the bonds in rbcl are formed primarily via sharing of electrons. true f…
False
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are all acids and bases harmful to humans? no yes
no
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answer the following below: explain what happens to an atom when the nu…
When the number of protons changes, the identity of the atom changes to a different element. When the number of neutrons changes, an isotope of the same element is formed. When th…
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boron isotopes are 19.9% boron -10, 80.1%, boron -11. calculate the ave…
10.801 amu
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consider a mixture of oil and water. what terms would you use to descri…
heterogeneous, immiscible
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pure maple syrup has a high sugar content. its composition is 70% sucro…
It will decrease.
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what force in liquids causes surface tension? covalent forces intermole…
B. intermolecular forces
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station 8 iron atom: 26 protons, mass number 56. 1. how many electrons …
1. 23 2. 30
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what is the significance of the chicago fire of 1871 on the history of …
Organic building materials like timber and thatch were replaced with more fire - proof materials like wrought iron.
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read the excerpt from \on imagination\ by phillis wheatley. now here, n…
It creates a pensive tone that shows the speaker's feelings on the power of imagination.
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read the excerpt from we wear the mask by paul laurence dunbar. we smil…
quatrain
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a golden shovel can impact the meaning of a poem by using a different p…
line to help express certain ideas.
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what do you observe about the sizes of the particles? why do you think …
1. Particles of water and ethanol are of molecular - scale size, which affects their properties. 2. They form a homogeneous solution due to hydrogen - bonding. 3. It may not be vi…
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multiple choice question when liquid water cools, but does not reach th…
pack closer together
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multiple choice question molecules changing from the liquid to the vapo…
B. evaporation
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multiple choice question identify a true statement about water molecule…
When water boils, nearly all the hydrogen bonds are broken, and many molecules enter the vapor state all at once.
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list three examples of physical properties and three chemical propertie…
Physical properties: Color, density, melting - point. Chemical properties: Flammability, reactivity with acids, oxidation.
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multiple choice question identify the type of bond, labeled as a, in th…
Hydrogen bond
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multiple choice question when a molecule in a liquid moves fast enough …
D. evaporation
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fill in the blank question are substances composed of a single kind of …
Elements
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multiple choice question identify a true statement about the hydrogen b…
They constantly break apart and re - form between molecules as they are weak.
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multiple choice question ____ is the only substance that naturally occu…
B. Water
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1. oil and water were poured into a funnel to separate the substances. …
a. The oil - water in the funnel is a mixture because they are not chemically combined and can be separated physically. b. Water in the conical flask is a compound as it consists …
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question 2 of 7 what is the best way for trevor to talk about the relat…
# Breve explicación: La limpieza es el proceso de remover suciedad visible y desechos físicos, mientras que la desinfección es un proceso químico que elimina o reduce la mayoría d…
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multiple choice question a water molecule consists of ______ hydrogen a…
D. one relatively large oxygen atom and two small hydrogen atoms
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question 8 points 3 which of the following does the hardness of water i…
B. I and II
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identifying reaction types & balancing equations step 2: balance the fo…
(1) \(2NaCl + F_{2} ightarrow 2NaF+Cl_{2}\) (2) \(2H_{2}+O_{2} ightarrow 2H_{2}O\) (3) \(2AgNO_{3}+MgCl_{2} ightarrow 2AgCl + Mg(NO_{3})_{2}\) (4) \(2AlBr_{3}+3K_{2}SO_{4} ightarr…
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identifying reaction types & balancing equations step 2: balance the fo…
(1) \(2NaCl + F_2 ightarrow2NaF + Cl_2\) (2) \(2H_2 + O_2 ightarrow2H_2O\) (3) \(2AgNO_3+MgCl_2 ightarrow2AgCl + Mg(NO_3)_2\) (4) \(2AlBr_3 + 3K_2SO_4 ightarrow6KBr + Al_2(SO_4)_3…
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question 4 points 1 what is the ph of neutral water? 8.5 7
B. 7
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question 1 of 7 trevors manager has asked him to help give a presentati…
# Breve explicación: El enfoque correcto para comenzar una presentación sobre control de infecciones en la industria de la belleza es enfatizar la responsabilidad de los profesion…
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what electron configuration matches an oxygen atom? 1s²2s²2p⁶3s² 1s²2s²…
1s²2s²2p⁴
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the electronic configuration of an atom an element with atomic number 1…
1s²2s²2p⁶
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attendance question read the following scenario and answer the question…
1. Electrical energy, chemical energy, mechanical energy, gravitational potential energy, sound energy 2. Chemical energy 3. Gravitational potential 4. Gravitational potential; ki…
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water’s molar mass is 18.01 g/mol. the molar mass of methanol is 32.01 …
Water
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gasoline and motor oil are chemically similar. they are both mixtures o…
Motor oil
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name per:____ date:____ chemistry people writing scientific notation pr…
1. $2\times10^{-7}$ 2. $5.4\times10^{6}$ 3. $1.2\times10^{2}$ 4. $9\times10^{-3}$ 5. $6.7\times10^{0}$ 6. $7.660002\times10^{6}$ 7. $9\times10^{6}$ 8. $8.4\times10^{4}$ 9. $6.89\t…
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³³p is a radioactive isotope of phosphorus. can ³³p be used to make a r…
D. Yes, because it can replace the phosphorus atom in the phosphate group.
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two atoms have the same number of protons but a different number of neu…
D. isotopes
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question 6 of 10 which of the following correctly compares the sulfur i…
D. \(^{32}S\) has 16 neutrons, whereas \(^{35}S\) has 19 neutrons.
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when water (h₂o) freezes into ice, some of the properties have changed.…
identity of the $H_2O$
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what happens when a substance undergoes a physical change? some physica…
Some physical properties change, but the substance keeps its identity.
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serena is mixing a material into a beaker filled with a liquid. she not…
A. solubility
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what is an example of a physical change? having less ash than the paper…
ice forming and then melting back into water
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water is made of two hydrogen atoms and one oxygen atom bonded together…
Atoms remain bonded to each other in physical changes.
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which scenario is an example of a physical change? o wood is burned in …
Lead is melted into a liquid to form pellets.
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match the reaction on the right with the corresponding reaction on the …
- Solid sodium + chlorine gas - solid sodium chloride: 2 - Solid sodium + liquid water - aqueous sodium hydroxide + hydrogen gas: 4 - $2H_2(g)+O_2(g) ightarrow2H_2O(l)$: 3 - $2H_2…
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water (h₂o) is a liquid at room temperature. ammonia (nh₃) is a gas at …
A. water
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homogeneous vs. heterogeneous matter. mixtures are the physical combina…
First table: 1. Homogeneous 2. Heterogeneous 3. Heterogeneous 4. N/A (not a mixture for this classification) 5. Heterogeneous 6. N/A (not a mixture for this classification) 7. Hom…
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matter classification worksheet all matter can be classified as either …
| Type of matter | Substance | Mixture | | ---- | ---- | ---- | | Chlorine ($Cl_2$) | Element | | | Water ($H_2O$) | Compound | | | Lucky Charms | | Heterogeneous | | Salt water |…