化学
化学反应、化学计量、分子结构与元素性质。
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in order for a solution to conduct electricity, the solution must have.…
C. a separation of ions
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question 8 (1 point) listen which of the molecules is polar? a) f₂ b) h…
B. $H_2O$
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question 7 (1 point) listen which of the following is ionic? a) scl₂ b)…
d) $Al_2O_3$
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question 6 (1 point) listen when a covalent compound melts, ... a) cova…
B. individual molecules are moved farther apart
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the solubility of each compound will be determined by mixing the compou…
B. 6 - well plate
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which of the following is true? a) none of the solutions will conduct e…
d) If an ionic compound is soluble in water, it will conduct electricity.
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question 3 (1 point) listen water is a universal solvent because... a) …
A. it can dissolve a large amount of ionic and polar compounds.
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question 2 (1 point) listen which of the following solutions would not …
A. non - electrolyte
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when dissolved in water, which of the following forms a molecular solut…
B. $CH_3OH$
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9/29 bath bomb day 1: related phenomena due oct 1 by 8am points 5 submi…
- Effervescence in Alka - Seltzer tablets - Fizzing of baking soda and vinegar reaction - Dissolution and gas - release in antacid tablets
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write a paragraph comparing and contrasting how the poets use topic, rh…
Poems vary in how they use topics, rhyme - schemes, and figurative language to convey themes. Some may have similar topics but different rhyme - schemes that alter the tone. For e…
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which statements describe elements? check all that apply. atoms of the …
- Atoms of the same element always have the same number of electrons. - Atoms of the same element can have different numbers of neutrons. - Atoms of the same element always have t…
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4) water molecules are composed of a. two oxygen atoms and two hydrogen…
B. one oxygen atom and two hydrogen atoms
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2) the central core of every atom, containing particles called protons …
C. nucleus
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elements in group 2 are all called alkaline earth metals. what is most …
which chemical properties they have
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part of one row of the periodic table is shown. which elements atoms ha…
tellurium (Te)
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this is how krypton appears in the periodic table. rounded to the neare…
A. 36
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which is a precautionary measure? using a fire extinguisher to put out …
wearing safety goggles while mixing chemicals
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which two chemists organized elements based on properties such as how t…
B. Döbereiner and Newlands
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what happens to particles in matter when thermal energy is absorbed? th…
1. The average speed of the particles increases. 2. The upper particle diagram (with blue - white molecule pairs) represents a pure substance.
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in an elements square on the periodic table, the number with the greate…
atomic mass.
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what are 1a, 3b, and 7a examples of on the periodic table? o groups, o …
groups
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dmitri mendeleev and henry moseley developed their periodic tables abou…
The number of protons in an atom is different than the atom’s total mass.
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how many groups are in the modern periodic table? 12 18 22 24
B. 18
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chlorine is vital for safe drinking water and widely used in paper, tex…
Sodium
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the term route of entry on an sds refers to the way a ____ enters the b…
D. Chemical
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a skull and crossbones pictogram indicates this kind of information abo…
C. Acute Toxicity
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identifying the properties of platinum locate the element platinum (pt)…
Melting point: 1768.3 °C Boiling point: 3825 °C
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locate the element xenon (xe) on the periodic table and click on the sq…
noble gas
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a local reaction is when a chemical enters the bloodstream. true false …
False
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locate the element helium (he) on the periodic table. what is the perio…
What is the period number in which helium is found? 1 What is the group name in which helium is found? 8A
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identifying the properties of zinc locate the element zinc (zn) on the …
Protons: 30 Electrons: 30 Neutrons: 35
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visit the interactive periodic table and locate the element neon (ne). …
Atomic number: 10 Atomic mass: 20.2
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what is the name of the phase change represented by box d? condensation…
Freezing
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use the information in the square to answer the questions about copper.…
How many protons are in an atom of copper? 29 How many electrons are in an atom of copper? 29 How many neutrons are in an atom of copper? 35
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hazardous waste laws resource conservation and recovery act (rcra) ther…
preventing accidental releases of hazardous waste
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hazardous waste laws government entities hazardous waste is a global co…
B. Environmental Protection Agency (EPA)
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part a how many low dose 81 mg aspirin tablets can be made from 1.21 kg…
1.5×10^4 tablets
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understand: physical properties, extrinsic & intrinsic ngss.ms: ms - ps…
- The first blank: physical property - The second blank: mass (or density, color, melting - point etc., any valid physical property)
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part a how many microliters are in 41.0 ml? 41×10³ 4.10×10⁴ 0.041 41×10…
4.10×10⁴ μL (corresponding to the second option in the multiple - choice)
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using density as a conversion factor the following table displays prefi…
$4.71$
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which statements accurately describe trends found in the periodic table…
Henry Moseley established a periodic table that arranges the elements by atomic number. The atomic number increases from left to right on the periodic table. Metalloids have the c…
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aluminum has a density of 2.70 g/ml. calculate the mass (in grams) of a…
$983$
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part a using the relationship between mass and volume in density, deter…
| Given Value | Need | Conversion Factor | |--|--|--| | 50 g | mL of sample | $\frac{1\ mL}{X\ g}$ | | 55 mL | g of sample | $\frac{X\ g}{1\ mL}$ | | 45 L | kg of sample | $\frac{…
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q1 chemistry: u2l15 electron config day 5 as a laxative. the pill they …
1. No ideal answer for the "Everlasting Pill" from the given options. 2. Set 1 represents the correct pair of elements. Element A is sodium (Na) with electron - configuration 1s²2…
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q1 chemistry: u2l15 electron config day 5 teacher: date: name: as a lax…
Question 1: No correct answer among given options Question 4: Set 1 Question 5: Student B is correct.
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match each scientist with the contribution he made to the arrangement o…
Johann Wolfgang Döbereiner - created groups of three elements, each based on similar properties Antoine Lavoisier - divided elements into four categories Dmitri Mendeleev - used p…
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3 select the correct text in the passage. which phrases/sentences are t…
Primary colors cannot be obtained by mixing other colors. Mixing two primary colors gives you a secondary color. Mixing a primary color with an adjoining secondary color gives you…
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what is the name of the phase change represented by box b? freezing con…
Condensation
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what is a catalyst? a substance that speeds up a reaction a substance t…
A. A substance that speeds up a reaction
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which of the following equations does not follow the law of conservatio…
Na + Cl2--> NaCl
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how many electrons does carbon have in its valence orbital? ______ (num…
4 False
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the subatomic particle with no charge. neutron electron proton ion
A. neutron
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the subatomic particle that identifies the atom. electron neutron proto…
C. proton
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question 9 (1 point) which subshell contains only one orbital? 1p 2s 3d…
B. 2s
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chemical bonds are made of these subatomic particles. protons neutrons …
C. electrons
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question 7 (1 point) which principle or rule demonstrates the fact that…
B. Hund's Rule
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question 14 1 pts the molecules on the left side of the arrow in an equ…
reactants
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question 6 (1 point) which pair of elements have valence electron confi…
Fluorine and chlorine
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question 13 1 pts the type of bond that forms when one atom transfers a…
ionic
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question 12 1 pts atoms that gain or lose electrons are called ________…
ions
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question 5 (1 point) s - block elements consist of all but which one of…
D. titanium
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limestone is mostly made of sediment and the fossilized remains of anci…
| | Chemical weathering | Gas exchange | Limestone formation | |--|--|--|--| | Carbon from the atmosphere interacts with the geosphere and then moves to the hydrosphere via runoff…
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question 11 a substance made entirely of one atom is known as an ______…
element
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this type of engineering deals with the motion of electrons in metals. …
D. Electrical
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determine whether each statement is true or false. runoff from the chem…
1. True 2. False 3. True 4. True
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this type of engineering applies scientific principles of chemistry, ph…
B. Chemical
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question 4 (1 point) the magnetic quantum number of an orbital defines:…
The spatial orientation of the orbital
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an atom that has extra neutrons is known as an _______________. (one wo…
isotope
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the 1980 eruption of mount saint helens in washington state released 10…
Reactants: carbon - based fuel, oxygen Products: carbon dioxide, water vapor
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question 3 (1 point) the n = 1 energy level contains ________ p orbital…
0, 3
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question 7 1 pts electron in the outer most shell are known as ________…
valence
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how do chemical weathering, gas exchange, and limestone formation help …
- Carbon from the shells and exoskeletons of marine organisms can be stored underground in limestone for millions of years. This prevents excessive buildup of $CO_2$ in the atmosp…
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limestone is mostly made of sediment and the fossilized remains of anci…
gas exchange: Carbon moves from the atmosphere to the hydrosphere or from the hydrosphere to the atmosphere. chemical weathering: Carbon from the atmosphere interacts with the geo…
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limestone is mostly made of sediment and the fossilized remains of anci…
1. gas exchange: During this process, carbon dioxide dissolves into ocean water and forms carbonic acid, which breaks down into simple ions. This process can also happen in revers…
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active cycling of carbon sustains life on earth. it regulates climate, …
1. Carbon moves from the atmosphere to the biosphere. 2. Carbon moves from the geosphere to the atmosphere. 3. Carbon moves from the atmosphere to the hydrosphere. 4. Carbon moves…
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*86. oxygen and hydrogen react explosively to form water. in one reacti…
48 g
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76. apply concepts the law of conservation of mass was introduced in ch…
Dalton's atomic theory explains the law of conservation of mass as atoms are rearranged in reactions without being created or destroyed, thus mass is conserved.
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1. lis les indices et complète le tableau suivant. indices : 1. les élé…
# Explicación: ## Paso 1: Analizar la información de A A tiene 5 electrones de valencia en la tercera capa electrónica. Esto significa que A es un átomo del grupo VA y del período…
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question 4 where is a proton found in an atom? (1 word)
Nucleus
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question 1 the process of breaking and or forming chemical bonds is kno…
chemical reaction
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question 1 the process of breaking and or forming chemical bonds is kno…
chemical reaction
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draw the lewis structure for the disulfur monoxide (s₂o) molecule. be s…
The resonance structures of \(S_2O\) are \(S=\ddot{O}=S\), \(\overset{-}{S}-\overset{+}{O}\equiv S\) and \(\overset{+}{S}\equiv\overset{-}{O}-S\)
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question 1 the process of breaking and or forming chemical bonds is kno…
chemical reaction
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aspartame is an artificial sweetener that is 160 times sweeter than suc…
Molar mass of aspartame: $294.34\ g/mol$ Moles in 12.7 g: $0.0432\ mol$ Mass of 1.31 moles: $385.58\ g$ Molecules in 7.9 mg: $1.61\times 10^{19}\ molecules$ Nitrogen - atoms in 2.…
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draw the lewis structure for the ethylene (c₂h₄) molecule. be sure to i…
The Lewis structure of \(C_2H_4\) has a \(C = C\) double - bond with each carbon atom bonded to two hydrogen atoms (\(H - C - C - H\)) and there are no resonance structures.
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question 4 a _______ is used for determining the chemical composition o…
Question 4: C. spectrograph Question 5: D. refraction
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a sample of liquid heptane (c₇h₁₆) weighing 11.10 g is reacted with 1.3…
(a) $0\ mol$ (b) $0.7749\ mol$ (c) $0.1123\ mol$
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what do these two changes have in common? mixing glue and laundry powde…
Both are chemical changes.
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(7th) unit 3 - the atom directions: write neatly with pencil. answers d…
1. Atom 2. Protons, neutrons, electrons 3. Protons, neutrons 4. Outside the nucleus in electron shells 5. Positive; because it contains positively - charged protons and neutral ne…
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a sample of liquid heptane (c₇h₁₆) weighing 11.10 g is reacted with 1.3…
(a) 0 mol (b) 0.7749 mol (c) 0.1123 mol
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name the following compounds. (a) mg3(po4)2 name: (b) sf6 name: sulfur …
(a) Magnesium phosphate (b) Sulfur hexafluoride (c) Potassium carbonate (d) Sodium perchlorate (e) Magnesium hydroxide
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a. use the periodic table to write the formula (including the charge) f…
a. $Cl^{-}$ b. $Se^{2 - }$ c. $P^{3 - }$
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the element europium exists in nature as two isotopes: ^151eu has a mas…
The relative abundance of \(^{151}\text{Eu}\) is approximately \(48\%\) and the relative abundance of \(^{153}\text{Eu}\) is approximately \(52\%\).
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determine the most likely ion to form. a. will al gain or lose electron…
a. lose; $Al^{3 + }$ b. lose; $K^{+}$ c. gain; $As^{3 - }$
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question 13 of 24 > pure magnesium metal is often found as ribbons and …
6.03
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concept questions predict the product. predict the major organic produc…
1. A half - ester product from the reaction of the anhydride and 2 - propanol. 2. A diester product from the reaction of the di - acyl chloride and excess 3 - propanol. 3. An amid…
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polarity what does it mean by polarity? which end of the water attracts…
La polaridad es la separación de cargas eléctricas en una molécula. El lado del oxígeno en la molécula de agua actúa negativo y los lados de los átomos de hidrógeno actúan positiv…
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according to its nutrition label, orange soda contains 49 g of sugar pe…
$10.8\%$
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acetylene gas is not explosive. true false 24 of 25
B. False