Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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which of the following is a nonmetal? a carbon b cesium c calcium d cop…
A. carbon
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the only nonmetal that is a liquid at room temperature is ________. ent…
Bromine
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examples of metals include a carbon. b phosphorus. c sulfur. d sodium
d. sodium
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which of the following are properties of nonmetals? select all that app…
B. dull and brittle C. relatively low boiling point D. poor conductors of heat
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which of the following statements are true about nonmetals? select all …
A. They can exist as solids, liquids, or gases B. They have a wide variety of properties, most of which are the opposite of metals.
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the necessity of solitude is deeper than we have said, and is organic. …
Regardless of how tightly bound communities may seem, each person is ultimately alone.
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a psalm of life by henry wadsworth longfellow what the heart of the you…
The poem adheres to a strict ABCB rhyme scheme, with no exceptions in stanzas.
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which of the following represents a property of metals? a high ionizati…
B. Shiny
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what is the rhyme scheme of \a psalm of life\? abbc aabb abba abab
D. ABAB
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read the passage. then answer the question. upcycling trash to treasure…
B. Upcycling helps keep plastic out of the ocean.
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read the passage. then answer the question. upcycling trash to treasure…
C. People think the fabric is comfortable and soft.
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which of the following is the atomic radius of chlorine if the internuc…
D. 100 pm
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arrange the following atoms in order of decreasing atomic radius: ga, a…
d. Sn, Sb, Te, Ga, As
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which of the following best explains why atomic radius decreases left t…
B. Protons are added to the nucleus, and the force of attraction on electrons is stronger
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in the periodic table, the element with the largest atomic radii is fou…
C. The lower left
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the atomic radius of a nitrogen atom is 71 pm. what is the distance bet…
C. 142 pm
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which of the following has the largest atomic radius among group 16 ele…
d. Po
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what will be the atomic radius of copper, if the distance between two a…
A. 128 pm
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____ has the smallest atomic radius. a tin. b germanium c silicon d lead
C. Silicon
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which of the following has the smallest atomic radius? a b. b ga c f d …
C. F
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which of the following halogens has the largest atomic radius? a fluori…
d. Iodine
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in this section, youll learn to use digital tools and identify how they…
C. Notion
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its been a few weeks since chloe downloaded the apps you recommended. s…
B. Focus@Will
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after agreeing with your suggestion to try out notion for tracking her …
Rewards that unlock music tutorials after learning sessions
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in this section, youll learn to use digital tools and identify how they…
Google Calendar
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14. arrange the following sets of elements in order of increasing atomi…
14a: Xe < Sn < Sr < Rb 14b: He < Kr < Xe < Rn 14c: Al < Pb < Ba < Cs 14d: F < Cl < Ar < I 15a: Na 15b: S 15c: N 15d: F 15e: Al
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13. in each of the following sets of atoms, which element would be expe…
a. Li b. Ca c. Cl d. S
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12. which elements on the periodic table lose electrons most easily (me…
Metals. Because metals have low ionization energies and fewer valence - electrons, making it easier for them to lose electrons to achieve a stable electron configuration.
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11. give some similarities that exist among the elements of group viia.
They all have 7 valence electrons, are highly reactive non - metals, form salts with metals, and exist as diatomic molecules in elemental form under standard conditions.
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8. how many valence electrons does each of the following atoms have? a.…
a. 1 b. 5 c. 3 d. 2 ### 9.
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7. to which element does each of the following abbreviated electron con…
Elements in Group VIIA have 7 valence electrons, are non - metals, have high electronegativities, and tend to gain an electron to form anions. ### Question 12
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6. write the complete orbital box diagrams for each of the following el…
For aluminum: 1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑ For phosphorus: 1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑ ↑ ↑ For bromine: 1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑…
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is dehydration synthesis the way that monomers are joined to make polym…
Yes
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in addition to science courses like physics and chemistry, what other t…
B. computer science
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the dissolving agent in an aqueous solution called the a) solute b) sol…
B. solvent
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1. the number of sublevels in a principal energy level (increases or de…
1. Increases 2. 2 3. a. Si; b. Be; c. Ne; d. Cl; e. Mn 4. a. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}\); b. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}\); c. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s…
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what does the atomic number of an element represent? a) the number of p…
A. The number of protons in the atom
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19 what does the atomic mass of an element represent? a) the number of …
C. The weighted average of the masses of the element’s isotopes
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18. what is one way that “covalent bonds” and “ionic bonds” differ? a) …
B. Ionic bonds involve transferring electrons; covalent involve sharing electrons
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17. which of these statements about electrons is true? a) electrons are…
C. Electrons are about 1/1840 as massive as protons
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the gas - phase reaction 2o3(g) → 3o2(g) has been studied in a closed r…
Using a larger reaction container, but the same initial amount of O₃(g).
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instructions: fill in the table below with the appropriate intermolecul…
1. Ion - dipole 2. London dispersion forces 3. Hydrogen bonding 4. Dipole - dipole
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15. an atom has 12 protons in its nucleus. what does this number repres…
B. The atomic number of the atom
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when a perfume bottle is opened, some liquid changes to gas and the fra…
A. Gases do not have a definite volume.
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(d) complete the dot - and - cross diagram to show the arrangement of e…
Draw the following: - On the central carbon, add 4 dots around it. - On the top - oxygen, add 2 crosses from the carbon (in the double bond) and 4 dots (2 lone pairs). - On the ri…
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the dissolving agent in an aqueous solution called the a) solute b) sol…
b) solvent
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assignment 9.2: systems of linear equations score: 8/9 answered: 8/9 qu…
Discipline: Mathematics Sub - field: Algebra
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questions 28 - 31 prompt questions 28 - 31: complete the tables by fill…
# protons: 26 # neutrons: 30 # electrons: 23
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questions 28 - 31 prompt: complete the tables by filling in the correct…
# protons: 10 # neutrons: 10 # electrons: 10
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questions 28 - 31 prompt: complete the tables by filling in the correct…
# protons: 7 # neutrons: 9 # electrons: 9
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balance the following chemical equations. each blank is worth one point…
1) 1 Fe + 2 HCl → 1 FeCl₂ + 1 H₂ 2) 2 Na + 2 H₂O → 2 NaOH + 1 H₂ 3) 4 Al + 3 O₂ → 2 Al₂O₃ 4) 1 Mg + 2 HNO₃ → 1 Mg(NO₃)₂ + 1 H₂ 5) 1 Zn + 2 HCl → 1 ZnCl₂ + 1 H₂ 6) 1 H₂SO₄ + 2 NaOH…
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questions 28 - 31 prompt: complete the tables by filling in the correct…
# protons: 15 # neutrons: 16 # electrons: 18
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in 1899, swedish chemist svante arrhenius developed an equation to answ…
remains
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match the type of energy with its example nuclear energy choose chemica…
nuclear energy - the sun chemical energy - batteries, fire light energy - the sun sound energy - strumming a guitar
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which phrase is the best definition of energy the ability to generate h…
Question 1: the ability to do work Question 2: chemical energy
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21 of 26 which is an intensive property of a substance? density volume …
density
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a03r - eqar1: states of matter (review) 20 of 26 which list includes on…
boiling point, conductivity, and color
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15 of 26 which of these is an example of investigating an intensive pro…
determining if a rock is magnetic
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a geochemist examines a piece of metal that he found in the soil. he pe…
He is identifying the metal using physical properties only.
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a student investigated some properties of lead and recorded the finding…
The student investigated more physical properties than chemical properties.
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which procedure could a student use to examine an intensive property of…
Determine the density.
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which statement describes a property that will be the same for both stu…
boiling point because it is an intensive property
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a03r - eqar1: states of matter (review) 3 of 26 which statement describ…
It is the same for every sample of a single substance.
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13) calculate the average atomic mass (decimal form) mass spectrum of s…
$28.1088$
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question 15 0.5 pts what are nurdles? pre - production plastic pellets …
Question 15: Pre - production plastic pellets Question 16: Circular ocean currents that drive accumulations of plastic debris
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which of these has the highest h⁺ concentration? multiple choice lemon …
Lemon juice, pH = 2.3
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which of the following is not an organic compound? multiple choice c₁₆h…
B. $Na_2HPO_3(H_2O)_5$
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which of the following will increase the rate of a chemical reaction? m…
An increase in reactant concentration
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what type of bond is labeled 1? water molecule
Polar - covalent bond
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periodic trends 1 & 2 practice 1. why does fluorine have a higher ioniz…
1. Fluorine has a smaller atomic radius and greater effective nuclear charge. 2. They have the same number of valence electrons. 3. a. Decreases; b. Increases 4. Increases; additi…
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which of these are examples of physical changes? check all that apply. …
B. freezing water, C. cutting paper, E. mixing water and acetone
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how do geologists determine the location of an earthquakes epicenter? b…
By using seismograph data to triangulate the distance from multiple seismic stations.
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which part of an atom is mostly empty space? o nucleus o proton cloud o…
C. electron cloud
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what do an electron and a neutron have in common? each particle has a m…
Each particle exists inside an atom.
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changes in bond energy quick check which statement explains the relatio…
The amounts of energy are always equal.
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which is a characteristic of the part of the atom marked \b\? it is ver…
It is negatively charged.
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students are completing a table about a particular subatomic particle t…
with "Outside of the nucleus," because the particle is an electron
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part 1: trends in properties within groups 1) place a small strip of ma…
Calcium is more reactive with water than magnesium because as we move down Group 2 of the periodic table, the number of electron shells increases, the outermost electrons are furt…
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4. this is an example of a chemical equation. h is the chemical symbol …
a. Two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. b. 2 c. 2 d. 2 e. 1 What elements are the wax of the candle made of? Carb…
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periodic trends - review problems 1) put the elements in order from the…
1) a) Li, Ne, Ar b) Mg, P, S c) Ge, Sb, I 2) a) K, Cs, Fr b) N, C, Ba c) S, Te, Sn 3) a) Be, O, Ne b) Sr, Ca, F c) Xe, Ne, He 4) a) Fr b) Si 5) a) Ba b) I 6) a) Zr, Zn, Co, Al b) …
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which of the following disposal methods should a medical assistant use …
First question: Place used syringes in a red biohazard bag. Second question: Assist the patient into an examination room.
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3b practice: chemistry for biology! write out your responses on 3b. inc…
1. a. 3 b. 32 c. 50 2. a. 4 (sodium, hydrogen, carbon, oxygen) b. 1 c. 6 3. a. Four atoms of iron react with three molecules of oxygen gas to produce two molecules of iron(III) ox…
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cst4 chapitre 1 : le systèmes déquations 4. le coût de 2 pantalons et d…
A pantalon costs $49$ dollars and a shirt costs $24$ dollars.
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5. using your beers law plot, determine the molar concentration of gluc…
Cannot be determined without absorbance data from the Beer's law plot.
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3. calculate the molar concentration of glucose complex present in each…
The molar concentrations are calculated using $C_2=\frac{C_1V_1}{V_2}$ for different values of $C_1$, $V_1$ and a fixed $V_2$. The correct values depend on the actual initial volu…
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a small organic food store makes two types of fruit smoothies: tropical…
$110$, so the answer is $\$110$.
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(d) the compound k₂o₂ also exists. a chemist can determine the mass of …
Yes
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1. calculate the molar concentration of glucose in the stock solution. …
1. Molar concentration of glucose in stock solution (assuming 1 g of glucose): $\frac{1}{180.18V}\ mol/L$ 2. Absorbance for each solution: Use $A = 2-\log_{10}(\%T)$ to calculate.
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free response questions answer the following questions related to k. (a…
(a) K has an extra electron - shell, increasing atomic radius. (b) Ca has higher effective nuclear charge, making its first - ionization energy higher. (c) Na. It's in the same gr…
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a student has two samples of nacl, each one from a different source. as…
A. Which sample has the higher purity?
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read the article in the following link and try the simulation to answer…
1. The ground - state is the lowest energy state of an atom with electrons in the lowest energy levels. The excited state is when electrons are in higher energy levels after absor…
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decide whether each molecule or polyatomic ion is polar or nonpolar. if…
| molecule or polyatomic ion | polar or nonpolar? | atom closest to negative side | | ---- | ---- | ---- | | $Br_2$ | nonpolar | | | $CCl_4$ | nonpolar | | | OCS | polar | O |
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tag all the sp hybridized carbon atoms in this molecule. if there are n…
The two carbon atoms in the triple - bond ($C\equiv C$) are sp hybridized.
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1. calculate the molar concentration of glucose in the stock solution. …
If the mass of glucose is $m$ grams and the volume of the solution is $V$ liters, the molar concentration of glucose in the stock solution is $\frac{m}{180.18V}\text{ mol/L}$
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3. the determination of glucose concentration in blood serum is often b…
| stock glucose, mL | concentration of glucose complex, M | % T | A | |---|---|---|---| | 5.00 | $2.775\times 10^{-3}$ | 76.91 | 0.114 | | 10.00 | $5.55\times 10^{-3}$ | 59.16 | 0…
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a sample of carbonate rock is a mixture of caco₃ and mgco₃. the rock is…
C. 3, 4, 6, 7
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consider the sulfur difluoride (sf₂) molecule. what is the central atom…
1. S 2. 2 3. 109.5 4. smaller
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answer the questions in the table below about the shape of the sulfur h…
What word or two - word phrase best describes the shape of the $SBr_6$ molecule? Octahedral What is the angle between the sulfur - bromine bonds? (If there is more than one angle,…
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2. explain why it is important to exercise extreme care when heating th…
Heating can cause side - reactions, alter sample composition, and pose a safety risk due to possible splashing.
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answer the questions in the table below about the shape of the triiodid…
How many electron groups are around the central iodine atom? 5 What phrase best describes the arrangement of these electron groups around the central iodine atom? Trigonal bipyram…