化學
化學反應、化學計量、分子結構與元素性質。
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6) choose all that apply. covalent molecules are typically found in whi…
- **Question 6**: gas, liquid - **Question 7**: 6
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8) choose the best answers using the image. which color represents the …
red
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9) choose the best answers using the image. which color represents the …
yellow
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10) choose the best answers using the image.which color represents the …
B. blue
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1) drag and drop the words with the descriptions. a group of atoms, cov…
1. polyatomic ion 2. crystal lattice 3. electrolytes 4. ionic compound 5. formula unit
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2) choose the best answer. the strongest bonds include ______. o small …
2. small ions 3. they dissolve in water
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4) choose the best answer. the property of ionic compounds that allows …
4. the strength of their bonding 5. \(Ca^{2+}\)
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6) choose all that apply. ionic compounds exist as which two things? as…
6) as repeating, alternating cations and anions, in a crystal lattice 7) crystalline lattice structure
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carters foreign policy listen which world leaders met with president ji…
Menachem Begin, Anwar Sadat
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energy crisis listen who declared an oil embargo against the united sta…
Organization of the Petroleum Exporting Countries
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3 nacl c₆h₁₂o₆ 2 caco₃ 8 h₂o chemical formula 8 2 1 3 number of compoun…
| Chemical Formula | Number of Compounds | \(Na\) | \(Cl\) | \(C\) | \(H\) | \(O\) | |---|---|---|---|---|---|---| | \(3NaCl\) | \(8\) | \(3\) | \(3\) | | | | | \(C_{6}H_{12}O_{6}…
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determine the number of compounds and the total number of atoms in the …
Number of Compounds: \(3\), \(1\), \(2\), \(8\) Total Number of Atoms: \(6\), \(24\), \(10\), \(24\)
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answer the following questions by filling in the boxes: what does the c…
- The coefficient (number in front of a chemical formula) represents the number of molecules of the substance. - The subscript (number within a chemical formula) represents the nu…
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what does a chemical equation tell us? (the arrow → in the equation is …
- Reactants (left - side): \(C = 6\), \(H = 12\), \(O=18\) - Products (right - side): \(C = 6\), \(H = 12\), \(O=18\) - Arrow meaning: Reactants yield products.
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suppose that vincente, founder of his own investment firm, orchestrates…
Individual
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18. choose the best answer. a copper statue turning bluish - green is a…
chemical weathering
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why do garages usually have low air quality? they are outside. chemical…
Chemicals are stored in garages.
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37. explain the densities of hydrogen and helium are lower than the den…
Helium is used instead of hydrogen because hydrogen is highly flammable (can react explosively with air) while helium is chemically inert (a noble gas with a stable electron confi…
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35. make and use tables use the periodic table to classify each of the …
- Lanthanides: europium (\(Eu\)), cerium (\(Ce\)), terbium (\(Tb\)). - Actinides: californium (\(Cf\)), nobelium (\(No\)), uranium (\(U\)).
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34. copy and complete the concept map using the following: na, fe, acti…
a. Alkali b. \(Na\) c. \(Cs\) d. Inner transition e. actinides f. \(Fe\) g. \(Hg\)
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33. copy and complete the concept map using the terms transition elemen…
a. Metals b. transition elements c. inner transition elements d. hydrogen e. noble gases
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complete each sentence with the correct term from the study guide. 20. …
20. metals 21. allotropes 22. metallic bonding 23. diatomic molecule 24. transition metals
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33. copy and complete the concept map using the terms transition elemen…
a. Metals b. Transition elements c. Inner transition elements d. Hydrogen e. Noble gases
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9. deduce why various silver compounds are used in photography.
Silver compounds (e.g., silver bromide) are used in photography because they are light - sensitive. Light causes a photochemical reaction where silver ions gain electrons to form …
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38. analyze copper is a good choice for use in electrical wiring. what …
Non - metals and noble gases. Non - metals have poor electrical conductivity (electrons not free to move for charge transfer). Noble gases have completely filled electron shells (…
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37. explain the densities of hydrogen and helium are lower than the den…
Helium is used instead of hydrogen because hydrogen is highly flammable (can react explosively with oxygen) while helium is chemically inert (a noble gas with a stable electron co…
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35. make and use tables use the periodic table to classify each of the …
- Lanthanides: europium, cerium, terbium. - Actinides: californium, nobelium, uranium.
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34. copy and complete the concept map using the following: na, fe, acti…
a. Alkali; b. \(Na\); c. \(Cs\); d. Inner transition; e. actinides; f. \(Fe\); g. \(Hg\)
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33. copy and complete the concept map using the terms transition elemen…
a. Metals b. transition elements c. inner transition elements d. hydrogen e. noble gases
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read the descriptions of rhyme schemes below. free verse: poetry that d…
Free verse
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when scientists think a chemical might be risky, what rule says we need…
Precautionary Principle
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key: al o what is the formula for this ionic crystal? submit your answe…
\(Al_2O_3\)
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key. what is the formula for this ionic crystal? submit your answer
\(Fe_2O_3\)
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which of the following pairs of elements could react to form an ionic c…
S and K, Ca and Cl
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which of the following elements will lose electrons to form an ion? che…
Pb, Fe
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which of the following pairs of elements could not react to form an ion…
C and O
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which of the following elements will gain electrons to form an ion? che…
F.
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which of the following could form an ionic compound? check all that app…
\(Cl^{-}\) and \(K^{+}\), \(Na^{+}\) and \(F^{-}\)
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check the box that best completes the following statement. in an ionic …
the ions have opposite charges
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which of the following could not form an ionic compound? check all that…
B. \(Ba^{2+}\) and \(Ag^{+}\), C. \(F^{-}\) and \(O^{2-}\)
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dani adds 10 grams (g) of salt to a jar of water. she then adds 10 g of…
D. The salt dissolved in the water, and the sand settled to the bottom of the jar.
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antonio is experimenting with solutions. he takes a large beaker of dis…
Antonio dissolved salt and sugar in water to form a solution. Solutions can have many solutes, but only one solvent. In this mixture, salt and sugar are solutes, and water is the …
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back to intro page mark as complete devin had a bucket of shredded meta…
- The metals in the mixture have all been shredded to similar sizes. - Filters should be used to sort by size.
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11.which of the following best describes how a filter can be used to so…
Filters allow objects of a certain size to pass through, so if you know the size or size range of a certain component in a mixture, you can pass the entire mixture through a filte…
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10. which of the following statements correctly explains why physical p…
When substances are mixed together, they retain their physical properties.
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7. if someone is stirring tea to mix sugar into it, which of the follow…
agitation
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9. use the following scenario to answer the question. in an experiment …
rate of dissolving
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8. use the following scenario to answer the question. tkeyah puts salt …
temperature
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5. which component makes up the majority of a solution? (1 point) solve…
solvent
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6. the following picture contains four beakers with four different colo…
the fourth solution from the left (right - most)
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2. select true or false • both physical and chemical changes are proces…
True
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1. which of the following is an example of a physical change? (1 point)…
dissolving sugar in water
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what is a factor that can significantly affect dissolved oxygen levels …
presence of chemical pollutants
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power plants that burn fossil fuels or use nuclear reactions to produce…
thermal (heat) pollution
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how is noise pollution best described? an unpleasant scent or smell a c…
unwanted or disruptive sound
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is mixing air into egg whites a physical or chemical change? (1 point) …
physical
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lesson 42 - classification of materials the spoiling of milk is an exam…
chemical
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lesson 42-classification of materials how does hydrogen react in a flam…
a pop
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lesson 42 - classification of materials how does the team know the gas …
flame test
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lesson 42 - classification of materials why is this a physical change? …
same gas before and after
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lesson 42 - classification of materials what caused the candles to go o…
carbon dioxide
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lesson 42 - classification of materials when something burns it is whic…
chemical change
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lesson 42 - classification of materials changes between states of matte…
physical changes
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esson 42-classification of materi gallium spoon melting is a physical c…
gallium
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lesson 42 - classification of materials which of these is true of fruit…
physical change
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lesson 42 - classification of material which of these is true of fruits…
physical change
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evaluate your friend says that nonpolar molecules cannot contain polar …
No, I do not agree. A non - polar molecule can contain polar bonds. For example, \(CO_2\) has polar \(C = O\) bonds (due to electronegativity difference between \(C\) (\(2.5\)) an…
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a_____is a heavy, thick square knife with a sharp, heavy blade good for…
- Question 9: cleaver - Question 10: ammonia - Question 11: False
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get it? describe the atoms involved in a nonpolar bond.
Atoms in a non - polar bond have the same or very similar electronegativities, and they share electrons equally. For example, atoms in \(H_2\) (\(H - H\) bond) and \(Cl_2\) (\(Cl …
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a) if all the orbitals shown in the 3d model are completely filled, how…
a) The element has \(12\) electrons. Justification: There is \(1\) \(s\) orbital (\(2\) electrons) and \(5\) \(d\) orbitals (\(10\) electrons), so \(2 + 10=12\) electrons. b) The …
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complete the rhyme scheme. from ella wheeler wilcox, \mistakes\ a a b b…
A. And looking back along the past B. We know we needed all the strain B. Of fear and doubt and strife and pain A. To make us value peace, at last
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drag the right word to its definition minerals or organic matter carrie…
sediment
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read the passage and use the diagram to answer the next question. silic…
\(28.11\)
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compare ionic and covalent bonds in the venn diagram below with at leas…
- Ionic: Transfer of electrons, between metal and non - metal, forms ions, high melting and boiling points, conducts electricity in molten/solution. - Both: Chemical bonds, hold a…
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get it? explain what is the charge of an ionic compound?
The charge of an ionic compound is zero.
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get it? explain why an atom of iodine tends to react to gain one electr…
Iodine has 7 valence electrons. Gaining one electron gives it a full outer shell (8 valence electrons), achieving a stable electron configuration like noble gases.
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complete the rhyme scheme. a a a b b two roads diverged in a yellow woo…
A, A, A, B, B
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get it? explain what part of an ions symbol indicates its charge?
The superscript part of an ion's symbol indicates its charge.
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complete the rhyme scheme. what matter if i stand alone? i wait with jo…
A, B, A, B
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complete the rhyme scheme. a b b c last night i heard your voice, mothe…
A B C B
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complete the rhyme scheme. a b b c last night i heard your voice, mothe…
A B C B
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complete the rhyme scheme. a a b b when you and i were young, we knew t…
A, B, B, A
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complete the rhyme scheme. a a a b on his roof the red leaf falls, at h…
A, A, B, A
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analyze why are group 14 elements much more likely to share electrons t…
Group 14 elements have 4 valence electrons. Transferring 4 electrons (either losing or gaining) would need a large energy input. Sharing electrons (covalent bonding) is a more ene…
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4. calculate how many molecules h₂o in 6.24 moles h₂o. hide hint hint: …
\(3.76\times 10^{24}\) molecules
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complete the steps in the formation of a potassium ion. 1. an atom of p…
1. \(1\) 2. loses 3. ion 4. \(+1\) 5. \(K^{+}\) Analyze: Group 14 elements have 4 valence electrons. Gaining or losing 4 electrons is energetically unfavorable, so sharing is pref…
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chemical bonds 2 types of bonds review vocabulary atom recall the defin…
- "a charged particle that has either more or fewer electrons than it has protons": ion - "the force of attraction between a positive ion and a negative ion in an ionic compound":…
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21. you now have the correct number of co₂ molecules. however, the numb…
\(6\)
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a small bubble rises from the bottom of a lake, where the temperature a…
\(14.3\)
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question 8 a sample of pure oxygen gas has a pressure of 795 torr. what…
\(1.05\) ### Question 9
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question 7 what is the pressure of the sample of gas trapped in the ope…
\(828\)
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which of the following has a dh°f = 0 kj/mol? a n₂(g) b no(g) c fe²⁺(aq…
A. $N_2(g)$ ### Question 6
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calculate the amount of heat in kj necessary to raise the temperature o…
\(10.9\)
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a chemist has synthesized a greenish - yellow gaseous compound of chlor…
$67.9$ ### Question 2
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apply it distinguish in each sample, create a model that shows the diff…
- For the pure substance circle: Fill it with one type of symbol (e.g., all small circles inside). - For the heterogeneous mixture circle: Divide it into sections and fill each se…
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lewis dot structures directions: drag the terms onto the blanks to comp…
bond, abbreviation, symbol, electrons, group, dots, Helium, two, paring
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group electrons abbreviation symbol dots bond eight inactive two reacti…
- outermost - reactions - group - symbol - abbreviation - eight - two - Helium - pairing - stable
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identify what are two examples of matter in this campfire?
Wood and ash.
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apply it stomach acid (1.0 - 3.0) soft drinks (2.5 - 3.5) milk (6.4) bl…
Lemon juice (\(pH: 2.2 - 2.4\)) is acidic (more acidic than water, \(pH = 7\)). Detergent (\(pH: 9 - 10\)) is basic (more basic than water).
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identify does the litmus paper show that the solution in the dish is an…
Yes, if the litmus paper was originally blue and it turned red, then the solution is an acid. This is because blue litmus paper changes to red in the presence of an acid.