Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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currently, new regulations control the use of pesticides and chemical f…
Water contamination
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is located in period 1. lithium (li) magnesium (mg) helium (he)
Helium (He)
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion
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which event is most likely occurring? o diffusion because particles mov…
diffusion because particles move from regions of high concentration to regions of low concentration
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complete the statements describing periods 1 and 2 on the periodic tabl…
- is located in period 1: Hydrogen (or H) - This period contains a total of: 2 - The valence electrons for these elements are located in the: first - is located in period 2: Lithi…
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why do atoms exchange or share electrons during bonding? (1 point) to h…
to obtain a full outer electron shell
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what are valence electrons? (1 point) o electrons that are exchanged be…
the electrons in an atom's outermost energy level
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which statement describes effusion? it occurs when a gas passes through…
It occurs when a gas passes through a tiny hole.
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which feature defines a neutral atom? (1 point) a full outer electron s…
the number of electrons equal to the number of protons
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which observation indicates that the kinetic - molecular theory has lim…
Increasing collisions of gas molecules will increase energy between them.
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the closeness of particles of gas and their low speeds allow intermolec…
This is a limitation of the kinetic - molecular theory.
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how can atoms that do not have a full shell become stable? * atoms \wan…
By gaining electrons to fill a shell or losing electrons to get rid of a shell exposing a full one underneath.
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complete the table to describe the properties of each set of elements. …
| Elements | Metals or non - metals? | Reactive or unreactive? | | ---- | ---- | ---- | | Br, Cl, F | Non - metals | Reactive | | K, Rb, Na | Metals | Reactive | | Ar, Kr, Xe | No…
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noble gases do not react with other elements because their valence shel…
full
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yes or no, are atoms stable if they do not have a full shell? * atoms \…
No
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from the periodic table, it can be determined that iron (fe) has an ato…
107 amu
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which of the following molecules shows two atoms of hydrogen (h)? (1 po…
$H_2SO_4$
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what does the law of conservation of mass say about a chemical reaction…
In a chemical reaction, mass is neither created nor destroyed
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what are the reactants in a chemical formula? (1 point) ○ the atoms lef…
the atoms prior to the chemical reaction, found on the left side of the equation
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this is a form of ground water pollution where heavier chemicals fall b…
B. Deposition
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11. you are given a container filled with clumps of iron and sand. you …
C. heterogeneous mixture
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11. you are given a container filled with clumps of iron and sand. you …
C. heterogeneous mixture
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while developing the periodic table, dmitri mendeleev left spaces for u…
Melting point: Low Flexibility: Brittle (not flexible) Electrical conductivity: Poor Chemical properties most similar to: Chlorine, Bromine
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again? lets start week 2 early! complete the statement by entering a nu…
5
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complete the statement by entering a num a neutral mg atom has valence …
2
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complete the statement by entering a number. a neutral cl atom has vale…
7
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complete the statement by entering a numbe a neutral cs atom has valenc…
1
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a neutral se atom has valence electron(s)
6
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complete the statement by entering a numbe a neutral si atom has valenc…
4
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complete the statement by entering a number. a neutral xe atom has vale…
8
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chemistry worksheet - wavelength, frequency, & energy of electromagneti…
1. $\lambda\approx7.98\times 10^{-7}\text{ m}$ 2. $ u\approx4.35\times 10^{20}\text{ Hz}$ 3. $\lambda\approx1.00\times 10^{8}\text{ m}$ 4. $\lambda\approx2.34\times 10^{-9}\text{ …
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8. in what family would each of these elements be classified? radium - …
8. Radium - Alkaline - earth metal Tin - Post - transition metal Iodine - Halogen Cesium - Alkali metal 9. Barium = 2 Lead = 4 Bismuth = 5 Potassium = 1
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periodic table basics 1. which elements had complete outer shells? give…
3. The number of valence electrons increases by 1 as you move from left to right across a period. 4. The number of energy levels or shells increases by 1 as you move down a group.…
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which of the following example demonstrates the reversibility of a chem…
recharging batteries
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which of the following happens during a chemical change but does not ha…
Atoms of one or more substances rearrange into a new substance
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which of the following is a reliable way to observe that a chemical cha…
conduct a test to determine the chemical makeup of the molecules
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2. which elements had only one valence electron? give the name and symb…
Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr); They are in group 1 of the periodic table.
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which of the following demonstrates a chemical change? (1 point) o iron…
iron (Fe) reacting to water((H₂O)) and oxygen(O) to form iron oxide(Fe₂O₃)
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which of the following is an example of only a physical change? (1 poin…
dry ice becoming vapor
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periodic table basics name 1. which elements had complete outer shells?…
These elements (argon - Ar, radon - Rn, neon - Ne) are all in Group 18 of the periodic table.
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periodic table basics 1. which elements had complete outer shells? give…
1. Noble Gases: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn). They are in Group 18. 2. Alkali Metals: Lithium (Li), Sodium (Na), Potassium (K), etc. Th…
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reminder: answer also the day that youre absent to receive full credit.…
1. **Natural sources of carbon**: Fossil fuels, decomposition of organic matter, volcanic eruptions. - **Human - sourced carbon**: Burning of fossil fuels, deforestation, industri…
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11 ozone is composed of ______ two hydrogen atoms and one oxygen atom t…
B. three oxygen atoms
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2. explain the difference between mass number and average atomic mass. …
2. Mass number is the sum of protons and neutrons in a single - isotope atom. Average atomic mass is the weighted - average mass of all naturally occurring isotopes of an element,…
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10 which of the following is a primary change seen in the mesosphere? t…
Temperatures decrease as the distance from Earth increases
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what does atmosphere mean in this story? a gases that surround a planet…
1. a. gases that surround a planet 2. a. The Northern Lights would be less bright. 3. Water is a universal solvent, participates in biochemical reactions, helps with temperature r…
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elements in the same group have similar properties. what element is in …
None of the given options are correct as silver's symbol is Ag not Au. If the option was silver (Ag), it would be the correct answer.
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which of the following elements has a max of 3 energy levels? c ca si
Si
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multiple - choice question beryllium is in the 2nd row. how many energy…
2
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the parts of the periodic table that goes up and down in columns are th…
B. groups
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true or false: chemists use the periodic table to make predictions abou…
True
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count the atoms! hio$_{3}$
5
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count the atoms! 3agclo₃
15
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count the atoms! ch₂choh
8
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what is the signifcance of the vertical columns on the periodic table? …
They have similar properties.
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count the atoms! lic₂h₅o
9
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multiple - choice question the modern periodic table is arranged in ord…
number of protons
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count the atoms! 2ga(oh)3
14
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count the atoms! 2c₃h₈o₂
26
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multiple - choice question how did moseley arrange the periodic table? …
B. atomic number
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count the atoms! ga(clo₄)₃
16
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count the atoms! lic₂h₅o
9
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mendeleev organized the chemical elements based on what two factors? sy…
atomic weight, properties
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b. properties of metals and important metal groups 3. list 5 properties…
1. Electrical conductivity 2. Thermal conductivity 3. Malleability 4. Ductility 5. Luster
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count the atoms! 2c₄h₆o₂
24
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count the atoms! ch₃coona
8
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part 2 (1 point) rank these three species in order of increasing formal…
$CN^-<CO_2<CH_3^+$
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1st attempt part 1 (1 point) what is the formal charge on the carbon at…
E. -1
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04 question (4 points) how many electron pairs are shared (i.e., how ma…
Part 1: 3 Part 2: 2 Part 3: 1 Part 4: 3
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part i: use the notation below to answer the following questions. pract…
1. Isotopes 2. Mass - numbers 3. Neutrons 4. \(^{12}C\): 6 protons, 6 neutrons, 6 electrons; \(^{13}C\): 6 protons, 7 neutrons, 6 electrons; \(^{14}C\): 6 protons, 8 neutrons, 6 e…
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8. what is the formula for calculating acceleration? 9. a student pushe…
8. $a=\frac{F}{m}$ 9. $0.5m/s^{2}$ 10. 8
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sample problem: problem 12.20 entropy - qualitatively for each of the f…
(a) $Cl_2$ because gases have higher entropy than liquids and even if both were gases, $Br_2$ has a larger molar mass but the gas - phase entropy contribution dominates. (b) $Pt$ …
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sort the following from lowest to highest absolute entropy at a given t…
$H_2O(s), H_2O(l), H_2(g), O_2(g), H_2O(g)$
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draw the orbital diagram for the magnesium ion (mg2+): write the electr…
Configuración electrónica: 1s²2s²2p⁶ Número de electrones no emparejados: 0 Diagrama de orbitales: 1s: (↑↓) 2s: (↑↓) 2p: (↑↓)(↑↓)(↑↓)
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draw the orbital diagram for the fluoride ion (f-): write the electron …
Orbital diagram: 1s: [↑↓] 2s: [↑↓] 2p: [↑↓] [↑↓] [↑↓] Configuración electrónica: 1s²2s²2p⁶ Número de electrones no - emparejados: 0
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which representation demonstrates a key limitation of lewis structures?…
The third structure (the one with double - bonded oxygen and single - bonded oxygens)
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part 2 (1 point) rank the bonds in the two molecules shown in order of …
1. C - H 2. C - O 3. O - H 4. C - F
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rank the bonds in the two molecules shown in order of increasing polari…
C - H, O - H, C - F
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rank the carbon - carbon bonds in the following hydrocarbons according …
1. $C_2H_4$ 2. $C_2H_6$
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how many valence electrons do each of the following species contain? 1s…
Part 1: 10 Part 2: 11 Part 3: 8 Part 4: 10
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if a 0.500 m aqueous solution freezes at -2.40 °c, what is the vant hof…
$i\approx2.58$
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question 45 water molecules have a slight bond between themselves and o…
B. hydrogen
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question 43 liquid fats called oils contain a. ring structures b. fat m…
D. long CH₂ chains linked by double covalent bonds and are often "kinked"
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a. organization of the periodic table 1. why do elements in the same gr…
Elements in the same group have the same number of valence electrons, which determines their similar physical and chemical properties.
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assuming 100% dissociation, calculate the freezing point (t_f) and boil…
$T_f=-23.1^{\circ}C$ $T_b = 106.38^{\circ}C$
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a chemist is using 334 milliliters of a solution of acid and water. if …
48.1
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question 38 this shows a pair of electrons in a covalent bond between t…
a. structural formula
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assuming equal concentrations and complete dissociation, arrange these …
Highest freezing point: $NH_4I$ Next: $Na_2CO_3$ Lowest freezing point: $CoBr_3$
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question 38 using the diagrams below: if cl interacted with na, cl woul…
d. gain an electron
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question 11 428 mols of mg are equal to 2.58×10²⁶ atoms of mg blank 1 4…
Question 11 Blank 1: 428 Question 12 Blank 1: 2.04 Question 12 Blank 2: 23
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k is the chemical symbol for which of the following substances? iron ba…
First question: D. Potassium Second question: A. Abnormal condition of stones
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question 13 the molar mass of c2h4(nh2)2 is 60 g/mol. blank 1 60
60 g/mol
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question 14 if a box of cacl₂ has a mass of 2.56 g. 0.0231 moles are in…
The values in the blanks are correct as they are consistent with the mole - mass and mole - atom relationships for $CaCl_2$.
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1. list three properties of the elements that are useful in sorting the…
Atomic number, Atomic mass, Electronegativity
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when your body burns 1.00 g of sucrose, blank 1 grams of oxygen is burn…
$1.12$
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question 19 using the equation 2li + 2h₂o → 2lioh + h₂ when 2.5 g of li…
93.5%
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question 18 using the equation 2h3po4 + 3mg(oh)2 → mg3(po4)2 + 6h2o, bl…
2.21
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question 17 using the equation 2c6h6 + 15o2 → 12co2+ 22h2o, blank 1 gra…
2534.4
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7 why are sodium - 23 and sodium - 24 different isotopes? a different n…
D. Different mass numbers
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question 16 using the equation al(oh)3 + 3hbr → albr3 + 3h2o, blank 1 m…
7.47