化学
化学反应、化学计量、分子结构与元素性质。
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the overall negative charge in tio₂ is -4. what is the charge of the ti…
\(+4\)
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oxide has a -2 charge. what is the overall negative charge in the formu…
-4
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consider the compound, tio₂. what is the charge of an oxide ion? +2 -4 …
-2
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what is the formula for cobalt(ii) nitride? co^{+2} n^{-3} c_{3}n_{2} c…
\(Co_3N_2\) (the second option)
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what is the charge on the nitride ion in cobalt (ii) nitride? +3 -5 +5 …
-3
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what is the charge on the cobalt in cobalt(ii) nitride? -1 +1 +2 -2
C. +2
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most of the periodic table is made of what type of element? metals meta…
metals
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name the ionic species formed from: magnesium & nitrogen magnesium nitr…
magnesium nitride
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name the ionic species formed from: selenium & lithium lithium monosele…
C. lithium selenide
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use the reaction to answer the question. c₁₀h₈ + 12o₂ →? which products…
A. \(10CO_2+4H_2O\)
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combustion reactions release ______. (1 point) light and oxygen light, …
B. light, carbon dioxide, and water
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in a replacement reaction, which nonmetal would replace chlorine? (1 po…
fluorine
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in a replacement reaction, which metal would replace aluminum? (1 point…
sodium
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which is the most common type of email scam? (1 point) check - cashing …
phishing
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a(n) diagram uses the chemical symbol of an element surrounded by dots …
Lewis
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fill in the blank question a(n) diagram uses the chemical symbol of an …
Lewis
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multiple choice question group 18 elements are unreactive because o the…
they have complete outer energy levels
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which are elements that exhibit properties of metals and nonmetals? met…
metalloids
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which statement correctly compares synthesis and decomposition reaction…
Synthesis and decomposition reactions are opposites of each other. Synthesis reactions are in the form \( A + B \to AB \), while decomposition reactions are in the form \( AB \to …
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you want to place a piece of glass tubing into a rubber stopper after t…
For the first question: all of the above. For the second question: any time chemicals, heat or glassware are used.
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which process that takes place in stars produces heavier elements from …
fusion
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the elements located on the upper right side of the periodic table and …
Non - metals
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which of the following equations shows a chemical change? (1 point) c3h…
\(C_{3}H_{8}+5O_{2}\to3CO_{2}+4H_{2}O\)
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multiple choice question which is a process that can lead to the discov…
fusing smaller nuclei to form a larger nucleus
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-- of 3 points question 3 3 tries left what made the curves in nest cha…
Wood can be heated to bend.
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10 multiple choice 1 point what is the molecular formula of eugenol? c₁…
A. \( C_{10}H_{12}O_{2} \)
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which of the following are typical properties of metals? conduct heat w…
conduct heat well, conduct electricity well, are shiny
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multiple choice 1 point what is the purpose of adding anhydrous sodium …
B. To act as a drying agent by removing water.
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multiple choice 1 point what is the role of dichloromethane (or a simil…
C. To dissolve eugenol in the organic layer.
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true or false 1 point eugenol contains a phenol group, which is respons…
True
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this hand held game is powered by batteries. which forms of energy are …
d. all of the above
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6 multiple choice 1 point which of the following techniques is typicall…
Extraction
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nuclear energy is often transformed to _______________ to make it usefu…
1. C. Electrical 2. D. chemical to mechanical 3. A. thermal 4. C. destroyed
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fill in the blank question the diagram shown is an example of a(n) diag…
Lewis
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what is the boiling point of eugenol under normal atmospheric pressure?…
254°C
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multiple select question select all that apply group 18 elements all ha…
- "have complete outer energy levels" - "include helium, neon, and argon, among others"
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fill in the blank question the are the elements that exhibit properties…
metalloids
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multiple select question select all that apply the second row of the pe…
- has elements with two occupied energy levels. - includes eight elements. - ends with the noble gas neon.
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multiple choice question all nonmetals _. o are poor electrical conduct…
are poor electrical conductors
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multiple choice 1 point during the liquid - liquid extraction process, …
To release the pressure build - up caused by volatile compounds.
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pre - lab quiz 7 answer all questions 1 true or false 1 point during th…
False
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chlorine is a gas that reacts with metals to form salts. based on perio…
bromine below it
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fill in the blank question the elements located on the left side of the…
metals
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multiple choice question a common chemical property of group 1 metals i…
nonmetals in group 17.
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match each scenario with the energy transformation. a toaster mechanica…
- a toaster: electrical to thermal - person running: chemical to mechanical - playing a violin: mechanical to sound - wind turbine: mechanical to electrical - tanning bed: electri…
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multiple choice question group iii elements are unreactive because o th…
they have complete outer energy levels
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multiple choice question how many dots are in the electron dot diagram …
8
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fill in the blank question a common chemical property of group 1 metals…
17
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multiple select question select all that apply the first row of the per…
- B. has elements with electrons in just one energy level - C. includes just two elements: hydrogen and helium
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fill in the blank question the diagram shown is an example of a(n) diag…
Lewis dot
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if an acid is splashed on your skin, wash at once with * soap oil weak …
- First question: plenty of water - Second question: disposed of according to your instructor’s directions
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classifying chemical reactions practice synthesis • two or more simple …
1. \(S\) 2. \(D\) 3. \(C\) 4. \(SR\) 5. \(DR\) 6. \(D\) 7. \(DR\) 8. \(S\) 9. \(C\) 10. \(SR\) 11. \(D\) 12. \(DR\) 13. \(C\) 14. \(SR\) 15. \(S\)
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laboratory aprons should be worn during all lab activities. * 2 points …
- First question: True - Second question: True - Third question: tell the science instructor at once
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if a piece of equipment is not working properly, stop, turn it off, and…
- First question: teacher - Second question: none of the above
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multiple choice write the correct letter in the blank. 1. the atomic nu…
1. B. 6 2. A. proton 3. D. 8 4. C. sodium 5. A. water
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chipped or cracked glassware is okay to use. * 2 points true false othe…
- For "Chipped or cracked glassware is okay to use": B. False - For "Return all unused chemicals to their original containers": B. False
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balanced chemical equation classification 1 2 na + cl₂→ 2 nacl 2 2 h₂o …
1. Combination reaction 2. Decomposition reaction 3. Combustion reaction (Redox reaction) 4. Single - displacement reaction 5. Double - displacement reaction (Precipitation reacti…
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read the poem oses,\ by george eliot. you love the roses—so do i. i wis…
"Roses" uses a more modern form.
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read the excerpt from \how we entered world war i\. in the midst of it …
show the reader that Germany was a legitimate threat to the United States.
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a mark made by a pointed tool such as a pencil, brush, pen or stick; al…
line, color, shape, value
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chem 100 - introduction to chemistry - fall 2025 q4. (1 point) true / f…
## Q4 False ## Q5 a) Draw an electron moving up (excitation) and then down (emission) on the energy - level diagram. b) The lowest horizontal line. c) Emission spectrum. d) red
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question 26 we learned how soap works when we studied cell membranes. t…
True
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question 22 2 pts in one of the videos you watched on diffusion, the sc…
True
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predict the major product. a. b. c. d.
A. Option Text
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question 15 when water is added to a molecule, chemical bonds are _____…
broken
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a single carbon atom can have a maximum of how many bonds? 6 4 2 3
4
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master the skill directions: study the information, read each question,…
A. no neutralization reaction, no neutralization reaction, neutralization reaction
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question 5 2 pts wearing gloves, goggles, and a lab coat, you may go to…
True
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question 3 all of the following statements are false except: ○ human bl…
It's not okay to take your fetal pig home.
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a reaction occurs that results in a molecule with two atoms of the same…
$N_2$
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which statement best explains why carbon bonds to four hydrogen atoms t…
Hydrogen shares one valence electron with carbon, and oxygen shares two valence electrons.
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which atom generally obtains a stable configuration by sharing electron…
chlorine (Cl)
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how many valence electrons do most stable atoms have? (1 point) one fou…
eight
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based on location in the periodic table, which element has chemical pro…
fluorine (F)
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when water freezes, what happens to the volume of the sample? it stays …
It increases.
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which of these will result in a racemic mixture? rxn i rxn ii a. rxn i …
A. Rxn I only
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why does the volume of a substance contract when it loses heat/energy? …
because its molecules move closer together
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choose the correct answer. why does the volume of a substance expand wh…
"because its molecules move further apart"
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predict the major product. rxn i rxn ii rxn i rxn ii a. + en + en b. + …
A. Option Text
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predict the major product. br2 h2o a. br + en ho c. ho + en br b. ho + …
A.
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classify each addition as either syn or anti. rxn i rxn ii a. syn anti …
D. anti, syn
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15. what principle is being shown in this image? emphasis color value b…
15. Emphasis 16. Geometric 17. Repetition
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1. an investigation of the compounds listed in the table most likely wo…
1. C. \(HCl\) 2. D. \(NaCl ightarrow Na^{+}+Cl^{-}\)
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which numbers/symbols correctly complete the table above? li, 3, 3 li, …
Li, 6, 3, 3, 2, +1
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which numbers/symbols correctly complete the table above? ○ li, 3, 3 ○ …
Li, 6, 3, 3, 2, +1
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which numbers/symbols correctly complete the table above? ○ ti, 22, 20 …
Ti, 22, 22
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question 2 2 pts which numbers correctly complete the table above? zn s…
30, 30, +2
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which numbers correctly complete the table above? ca 18 20 44 1 symbol …
20, 24, +2
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which is the best method for the following transformation? a. 1. bh₃, t…
A. 1. \(BH_3\), THF 2. \(H_2O_2\), \(OH^-\)
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identify the reagents needed to best achieve the following transformati…
A. \(HBr, ROOR\) for \(Rxn\ I\) and \(1. BH_3, THF; 2. H_2O_2, OH^-\) for \(Rxn\ II\)
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provide the major product for each reaction. rxn i 1) hg(oac)₂, h₂o 2) …
A.
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were the following additions markovnikov or anti - markovnikov addition…
B. Markovnikov, Anti - Markovnikov
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4. which quotation from the poem best highlights how the speaker views …
4. A. "I'm truly sorry Man's dominion / Has broken Nature's social union" (Lines 7 - 8) 5. The comparison shows that while the mouse has a simple life affected by human actions, h…
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provide the product according to the request, markovnikov or anti - mar…
A.
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part c matching match each description in column b to the correct term …
17. e, 18. g, 19. a, 20. f, 21. c, 22. d, 23. h, 24. b
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what type of gloves protects your hands from hazardous chemicals? selec…
Vinyl or neoprene gloves
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name class date 5.4 the periodic table: organizing the elements section…
1. groups 2. periods 3. atomic number 4. group 5. representative elements 6. noble gases 7. transition metals 8. inner transition metals 9. alkali metals 10. alkaline earth metals…
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avogadro hypothesized that equal volumes of gases contain equal numbers…
molecules
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4. which of the following is not a postulate in daltons atomic theory? …
I
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5. what is the chemical formula for aluminum sulfate? also₄ al₂(so₄)₃ a…
\(Al_{2}(SO_{4})_{3}\)