化学
化学反应、化学计量、分子结构与元素性质。
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how many protons, neutrons, and electrons are in this ion? 33 16 s - 2 …
\(16\ p^{+},17\ n^{0},18\ e^{-}\) (the first option)
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how many protons, neutrons, and electrons are in this ion? 27/13 al+3 1…
\(13p^{+},14n^{0},10e^{-}\) (the fourth option)
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what is the smallest unit of an ionic bond? an atom a molecule a formul…
a formula unit
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at what temperature does liquid water turn into steam? 212 degrees fahr…
212 degrees Fahrenheit
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56. what are the indispensable requirements for food handlers who are d…
56. b. Bury waste in a compost pit. 57. d. Work only during open hours. 58. a. Only the appropriate transport vehicles and preventing cross - contamination. 59. a. Reheat to 135 d…
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technician a says that mercaptan is added to liquefied petroleum or nat…
a. Technician A
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what was the primary focus of rachel carsons book, silent spring, which…
chemical use in society
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which type of material is the best thermal conductor? nonmetal metalloi…
metal
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open ended questions question #1 how does understanding chemical bondin…
For Question #1: Understanding chemical bonding helps explain material properties and different substances. For Question #2: Covalent bonds (e.g., in \(H_2O\) and \(O_2\)). For Qu…
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sodium and chlorine react to form an ionic compound. what is the correc…
sodium chloride
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sodium and chlorine react to form an ionic compound. what is the correc…
\(NaCl\) (the third option)
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what mass of nacl formed when 0.25 g na react completely with 0.39 g cl…
\(0.64\space g\space NaCl\) (corresponding to the third option)
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sodium and chlorine react to form an ionic compound. what is a physical…
The sodium has a shiny luster.
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potassium and sulfur react to form an ionic compound. what is the corre…
potassium sulfide
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short answer questions question #1 what are the three types of chemical…
1. Ionic bonds, covalent bonds, and metallic bonds. 2. Chemical bonding determines the properties of substances and thus reactions in daily life. 3. Lewis diagrams show valence - …
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lesson 2 check: 1. how does reducing the rate of a chemical reaction af…
1. It makes the chemical reaction occur more slowly. 2. The brown color and the rotting (decomposition) of the apple. 3. A chemical reaction occurred as a new substance (the cloud…
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fill in the blank question are particles with an electric charge of 1-.…
Electrons
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multiple choice question the smallest particle of an element that retai…
atom
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which of these is a property of a metal sample? the sample will have a …
The sample will be malleable.
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fill in the blank question the letter c is the symbol for the element n…
carbon
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fill in the blank question are particles in the nucleus with an electri…
Protons
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what property of a metal does the image represent? malleability electri…
electrical conductivity
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what property of a metal does the image represent? ductility malleabili…
malleability
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what property of a metal does the image represent? thermal conductivity…
thermal conductivity
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fill in the blank question and are the three basic subatomic particles …
Protons, neutrons, and electrons.
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fill in the blank question the small, positively charged center of the …
nucleus
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fill in the blank question a(n) is the smallest particle of an element …
atom
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multiple choice question which is the symbol for the chemical element h…
\(H\)
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what general trend does electronegativity follow on the periodic table?…
A. It decreases from top to bottom.
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question 5 of 10 a metal ion (x) with a charge of 2+ is attracted to a …
D. \(X_{3}Z_{2}\)
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use the crisscross method to find the chemical formula for the ionic co…
D. \(Al_2S_3\)
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what is the chemical formula for iodine trichloride? a. icl₃ b. i₃cl c.…
A. \(ICl_3\)
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atoms of which pair of elements will form covalent bonds in a compound?…
A. C and O
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which option correctly matches the chemical formula of a compound with …
D. \(N_2O_5\), dinitrogen pentoxide
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how many electrons are in the following ions? mg²+ al³+ s²- na+ cl- cu²…
\(Mg^{2+}:10\), \(Al^{3+}:10\), \(S^{2-}:18\), \(Na^{+}:10\), \(Cl^{-}:18\), \(Cu^{2+}:27\), \(N^{3-}:10\), \(Cs^{+}:54\), \(Br^{-}:36\)
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6. you get a can of soda from the vending machine and your *friend* mal…
This is a physical change. The fizzing is due to the release of dissolved carbon dioxide gas (\(CO_2\)) from the soda. The chemical composition of the soda (e.g., water, sugars, f…
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4. you pick up a ice cream sandwich from the school cafeteria and you s…
This is a physical change. The ice - cream sandwich melting is a phase change (solid to liquid) without a change in chemical composition.
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2 you find a nail on the ground in the parking lot, in a small puddle o…
This was a chemical change. Rust (iron oxide) is a new substance formed when iron (in the nail) reacts with oxygen and water. Chemical changes produce new substances, while physic…
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1. find the percent composition of each compound as given: a. % o in fe…
\(22.3\%\) ### Problem 1b: % Cl in \(MgCl_{2}\)
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10. consider the following elements - calcium, bromine, and rubidium - …
Calcium: Shiny, Malleable, Conducts electricity, Reactive with HCl. Bromine: Dull (if solid - like its solid form in some conditions, but as a liquid it has a different appearance…
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5. you volunteer for chalkboard cleaning duty and you get to work with …
Physical change. Because when cleaning the chalkboard with the eraser, only the state and distribution of the chalk (no new substances formed) change.
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states that atoms gain, lose or share electrons to fill their outermost…
Octet rule
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delocalised electrons metal ions the model in the image above is a \sea…
metallic bonds
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the octet rule is absolute in terms of covalent bonding. true false
False
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label the image with the correct types of bonds. 3 types of chemical bo…
1. Ionic bond 2. Covalent bond 3. Metallic bond
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practice problems - type ii binary compounds write the correct name for…
1. copper(II) sulfide 2. lead(IV) bromide 3. lead(II) nitride 4. iron(III) oxide 5. iron(II) iodide 6. tin(IV) phosphide 7. copper(I) sulfide 8. tin(II) chloride 9. cadmium(II) ox…
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practice problems - type ii chemical formulas directions: write the cor…
1. \(FeCl_{2}\) 2. \(Cu_{2}S\) 3. \(PbI_{4}\) 4. \(SnF_{2}\) 5. \(ZnBr_{2}\) 6. \(SnO\) 7. \(Cr_{2}O_{3}\) 8. \(AuI\) 9. \(Mn_{3}N_{2}\) 10. \(CoP\) 11. \(FeCl_{3}\) 12. \(CuS\) 1…
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practice problems - type ii chemical formulas directions: write the cor…
1. \(FeCl_{2}\) 2. \(Cu_{2}S\) 3. \(PbI_{4}\) 4. \(SnF_{2}\) 5. \(ZnBr_{2}\) 6. \(SnO\) 7. \(Cr_{2}O_{3}\) 8. \(AuI\) 9. \(Mn_{3}N_{2}\) 10. \(CoP\) 11. \(FeCl_{3}\) 12. \(CuS\) 1…
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what type of energy is in your food? electromagnetic chemical mechanical
chemical
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what happens during a chemical change? composition stays the same. comp…
Composition changes.
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what properties are changed when glass breaks? atoms and molecules size…
size and shape
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in its pure form, what state of matter is hydrogen? solid liquid gas
Gas
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which element has an atomic number of 19? sodium potassium calcium
Potassium
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which part of an atom is found outside the nucleus? protons electrons n…
Electrons
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what is the very smallest piece of aluminum possible? aluminum foil an …
an aluminum atom
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the number in each square of the periodic table tells us the atomic num…
Argon (Ar)
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according to the kinetic theory model, which state of matter has partic…
Gas
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when a solid sublimates, what state of matter does it skip changing int…
It skips changing into a liquid and becomes a gas.
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what is the definition of condensation? liquid particles gain energy to…
Gas particles lose energy to become a liquid.
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what is the change in heat of 15.8 grams of argon when its temperature …
- 5570 joules This process is exothermic because heat is released by the argon as it cools.
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what is an example of vaporization? rain falling out of the sky a puddl…
Water changing to steam
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when solid ice cream becomes a liquid, what happens to the particles? t…
The particles gain energy and move faster.
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a student is given a mystery substance dissolved in water. the mystery …
The mystery substance is Compound 1 because it is made of ions, whereas Compound 2 is made of molecules.
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magnets are closely associated with what form of energy? chemical elect…
electrical
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22 fill in the blank 1 point molecules of carbon disulfide are shown be…
London Dispersion Forces
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26 fill in the blank 1 point the following image, represents a choose y…
polar covalent bond
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23 multiple choice 1 point in the image shown above, which letter repre…
D. B
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fredv ber produces organic juice bottles. the revenue function ( r(p) )…
\(P(p)=-4p^{2}+224p - 1500\)
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electron dot diagrams for four elements are shown. which element would …
D. 2
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14 fill in the blank 1 point hydrogen bonding requires the most amount …
Hydrogen Bonding requires the most amount of energy to break the attractive forces between molecules resulting in a high boiling point.
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elements from period 3 of the periodic table are highlighted. which ele…
B. Silicon
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which of the following statements is true regarding used engine oil? se…
d. All of the choices listed are correct.
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technician a says that one should always be careful not to mix incompat…
c. Both A and B
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which period 4 element would you expect to have the highest electrical …
B. Potassium (K)
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chlorine (chemical symbol cl) is located in group 17, period 3. which i…
A. A gaseous, highly reactive nonmetal
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part i. for each of the following isotopes, write the number of protons…
| | Carbon - 12 | Carbon - 13 | Carbon - 14 | Chromium - 58 | Chromium - 63 | Nitrogen - 15 | Nitrogen - 20 | Sulfur - 23 | Sulfur - 25 | |---|---|---|---|---|---|---|---|---|---|…
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which two elements have similar properties and 8 electrons in their out…
D. Krypton and xenon
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as you move from left to right across period 3, which statement is true…
C. The number of valence electrons increases by 1.
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based on the trend in valence electrons across periods for main - group…
A. 7
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question 23 1 point acids have a ph than 7; bases have a ph than 7 and …
Acids have a pH less than 7; bases have a pH greater than 7; neutral solutions have a pH equal to 7.
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if an element forms a 2+ ion, in which group of the periodic table woul…
D. 2
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find the location of fluorine (f) on the periodic table. what type of i…
C. An ion with a -1 charge
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classify this fatty acid as saturated or unsaturated. a saturated fatty…
B. unsaturated fatty acid
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which model shows 5 electrons in the outer shell of the atom? a. 4 b. 2…
A. 4
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select one: o a. ensuring that waste products are disposed of in an env…
d. All of the answers listed
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floridas elevation affects its climate. how does elevation affect the t…
As elevation increases, air pressure decreases, the air molecules spread out, and the air cools.
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multiple - choice question noble gases are... metals. radioactive. very…
unreactive.
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question 5 carbon has ___ valence electrons. a 2 b 5 c 4
C. 4
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question 3 which of the following is not an organic compound? a carbohy…
Question 3: B. water Question 4: A. carbon
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question 2 which subatomic particles are located in the nucleus of the …
A. neutrons, B. protons
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another name for group 7 elements, that have a -1 charge and are very r…
Halogens.
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multiple - choice question what are the metals in the middle of the per…
Transition metals.
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group 2 metals are also called... alkaline earth metals. alkali metals.…
A. Alkaline Earth Metals.
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multiple - choice question group 1 metals are also known as... halogens…
Alkali metals.
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multiple - choice question why did the periodic table initially not fol…
Because Mendeleev was ordering the table by atomic mass.
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multiple - choice question the relationship between elements and atomic…
periodic.
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after mendeleev organized the periodic table by atomic weight, he notic…
reactivity.
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multiple - choice question initially, mendeleev organized elements by..…
Atomic weight.
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multiple - choice question what is the name of scientist who discovered…
Mendeleev
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10 multiple choice 1 point identify the molecular shape name for the fo…
trigonal planar