Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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question 2 covalent bonds form when two hydronium ions are attracted to…
two hydrogen atoms share electrons with one oxygen atom.
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why does the air near the ceiling feel warmer than the air near the flo…
- First question: Warm air rises because of convection currents. - Second question: By radiation through waves.
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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where are people exposed to chemicals? a. mostly outside b. everywhere …
B. Everywhere
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what do chemists study? a. mathematical principles b. the properties of…
B. The properties of matter and how matter changes
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why is chemistry a science, but alchemy was not? a. chemistry desle wit…
C. Chemistry uses experiments to test ideas, whereas alchemy used superstitious practices.
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what term describes the amount of energy necessary to change liquid wat…
heat of vaporization
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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how long have people studied chemistry? a. since fire was discovered b.…
A. Since fire was discovered
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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1. use the following information to answer question 1. an entire popula…
C. 250
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which of the following ideas about the atom changed when new evidence w…
D. Atoms cannot be divided.
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drag each tile to the correct box complete each analogy with the approp…
subsistence precarious abysmal voracious
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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what was the result of the atomic theory? a. alchemy was transformed in…
B. Chemists began to better understand the properties of matter.
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read the text. when a person ingests caffeine, whether in the form of a…
sequential
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what is chemistry? a. the study of living things b. the scientific stud…
B. The scientific study of matter
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product knowledge performance chemicals exit radiator cleaner and flush…
True
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what was alchemy? a. an area of research that investigated all areas of…
C. An attempt to turn cheap metals into gold and develop potions using superstitious practices
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who developed the philosophical idea of the atom? a. boyle b. dalton c.…
C. Democritus
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match each type of model to the corresponding example. mathematical mod…
1. conceptual model 2. virtual model 3. physical model 4. mathematical model
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select the correct answer from each drop - down menu. daniel and sanya …
Daniel's field of study: geography; Sanya's field of study: chemistry
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identifying the causes of precocious puberty in the united states, the …
exposure to pollutants, exposure to phthalates, unhealthy weight gain, disruptions to the endocrine system
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select all of the choices that are the same for two different isotopes …
- number of protons - atomic symbol - atomic number
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examine the isotope below, determine its atomic number. 235u 92 235 327…
92
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examine the isotope below, then indicate the number of neutrons for thi…
143
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an atom has 11 protons, 10 electrons, and 13 neutrons. what is the atom…
24 amu
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an atom has 79 protons, 78 electrons, and a mass number of 118. how man…
39
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which has a greater atomic number? carbon - 14 or carbon - 12 carbon - …
They have the same atomic number because they both are Carbon.
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4. what are some examples of phase changes, or changes in state, you ha…
Melting (e.g., ice turning to water), boiling (e.g., water turning to steam), freezing (e.g., water turning to ice).
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h chemistry name:__________________________period_____ cooling curve ws…
1. Decreasing 2. \(90^{\circ}C\) 3. \(150^{\circ}C\) 4. \(90^{\circ}C\) 5. \(EF\) 6. \(CD\) 7. \(AB\) 8. \(BC\) 9. \(DE\) 10. \(BC\) and \(DE\) 11. \(AB\), \(CD\), \(EF\) 12. \(BC…
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5. what is the difference between an atom and a molecule?
An atom is the smallest unit of an element (with protons, neutrons, electrons), can exist alone (e.g., noble gas atoms). A molecule is formed by 2+ atoms bonding (e.g., \(H_2O\) f…
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3. how is ice melting different from burning something?
Melting ice is a physical change (no new substances formed, same chemical composition \(H_2O\)), while burning something is a chemical change (new substances formed, chemical comp…
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2. how is a solid different from a gas?
A solid has a definite shape and volume. Its particles are closely packed and vibrate in fixed positions. A gas has no definite shape or volume. Its particles are far apart and mo…
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heat transfer between two substances is affected by specific heat and t…
amount of time and area of physical contact between the substances.
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1. what is the difference between reactants and products?
Reactants are starting substances (left - hand side of equation, consumed), products are formed substances (right - hand side of equation, generated).
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the poem \mending wall\ differs from many of frosts poems because... it…
the narrator discusses the destructive properties of nature rather than its beauty.
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which best explains how a heat pump can heat a room? cold air from the …
Cold air from the house is moved through pipes, where it absorbs thermal energy.
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the energy states of atoms containing more than one electron arise from…
E. None of these statements is generally correct.
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read each item. then click on the primary purpose of the item. 10. (1) …
b. persuade
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what is the formula for the ionic compound formed by calcium ions and n…
E. \(Ca(NO_3)_2\)
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select the correct text in the passage read the following poem, \the su…
"She's all states, and all princes, I"
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the lewis dot symbol for the chloride ion is a) ::a:: b) ::a: c) cl- d)…
A.
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question 11 (10 points) what is the percent carbon in ch3ch2oh? a) 46% …
D. 52%
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which of these terms describes h3po4? strong base weak base weak acid s…
weak acid
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which of these terms describes koh? strong acid weak base strong base w…
strong base
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which of these terms describes hf? weak acid weak base strong acid stro…
weak acid
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what type of compound is represented by the graph? consider how much ha…
weak acid
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how are strong bases different from weak bases? weak bases have a highe…
Strong bases fully dissociate in water.
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what distinguishes a weak acid from a strong acid? strong acids have a …
Weak acids have a low rate of dissociation.
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how people communicate their gender identity to others is referred to a…
- First question: C. expression; roles - Second question: D. poorer social functioning and mental health
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which describes what happens when fuel is ignited in a heat engine? che…
Chemical energy is converted into thermal energy.
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question 10 (10 points) the compound, p4s10, is used in the manufacture…
D. tetraphosphorus decasulfide
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question 8 (10 points) which of the following is a molecular formula fo…
E. None of the answers is correct.
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before thermal energy in fuel can be transferred to the air in heating …
The energy in its chemical bonds must be converted to thermal energy.
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1 multiple choice 1 point which of the following is not one of the thre…
1. B. Don't use 2. D. Caffeine
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which one of these species is an ion? a) nacl b) b3+ c) he d) 14c e) no…
B. B³+
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bases have a ph above 7 and taste bitter. which of the following is ano…
donate hydroxide ions, \(OH^-\)
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question 6 (10 points) in which of these pairs of atoms would the bond …
A. \( C - C\)
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which of these compounds is likely to be sour and have a ph less than 7…
C. \(HClO\)
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which color is litmus paper in the presence of an acid? green blue red …
C. red
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select the correct lewis structure for nitrogen trifluoride, nf3 a) : f…
A.
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how many lone pairs of electrons need to be added to complete this l st…
C. 0
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question 2 (10 points) which of the following species has the shortest …
B. \(C_2H_2\)
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question 1 (10 points) arrange aluminum, nitrogen, phosphorus, and indi…
A. \(In < Al < P < N\)
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what ion is formed when an atom of mercury (hg) loses two electrons? ○ …
Hg²⁺ (the fourth option in the given choices)
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correct the one error. carlotta_valdes it took me three hour to finish …
It took me three hours to finish my chemistry homework last night.
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in __________ reactions, the products contain more energy than the reac…
endothermic
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chemist: zion bington molar mass/percent composition worksheet instruct…
Formula: \(CuBr_{2}\) Cu: \(28.45\%\) Br: \(71.55\%\) ### 2) Sodium Hydroxide
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reading check 8. identify which of the four fundamental forces causes f…
- 8. The electromagnetic force causes friction. - 9. No, the match would not light. Friction generates heat which is needed to ignite the match - head chemicals. Without friction,…
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thermal; nuclear; radiant; mechanical; chemical; electrical a ball on t…
1. Mechanical 2. Chemical 3. Nuclear 4. Radiant 5. Electrical 6. Mechanical 7. Thermal 8. Thermal 9. Nuclear 10. Radiant
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what is the mass number of the isotope lithium - 7? lithium has 3 proto…
7 5
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sample response: even though a compound can be made of two or more type…
A. A compound can be a pure substance, B. A compound can be isolated.
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a chemical that kills sperm. / 2 points spermicide morning after pill a…
Spermicide
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the element aluminum has an atomic number of 13. how many protons are i…
13 13
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electron configurations, valence electrons, dot diagrams name date peri…
\(3d>4s > 3p>3s>2p\)
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sample response: an element is considered a pure substance because it i…
An element is made up of only one type of atom. An element cannot be broken down into a simpler form.
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identifying parts of an atom categorize the particles according to whet…
- **Nucleus**: neutral particles, positively charged particles - **Electron Cloud**: negatively charged particles
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heating curve homework name date per answer the following using the abo…
1. \(5^{\circ}C\) 2. \(5^{\circ}C\) 3. \(15^{\circ}C\) 4. - a. Solid is being heated. - b. Solid is melting. - c. Liquid is being heated. - d. Liquid is boiling. 5. \(a\) 6. \(c\)
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4 select the correct answer. mercury is in the 80th position in the per…
C. 80
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ability to resist sudden changes in temperature. water absorbs and rele…
B. Proximity to water makes climates more moderate.
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match each concentration with the correct expression. • concentration •…
- "Amount of solute divided by the amount of solution" → "Concentration" - "Volume of the solute divided by volume of solution" → "Volume percent" - "The concentration of the stoc…
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test your knowledge 2 categorize each statement as true or false. decre…
1. False 2. False 3. True 4. True 5. False
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match each term with the best definition. • saturated solution • solute…
- A homogeneous mixture of two or more components: Solution - A solution that contains a greater amount of a dissolved solute than is present in a saturated solution: Supersaturat…
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how many moles of propane react when 294 g of co₂ form? c₃h₈ + 5o₂ → 3c…
\(2.23\space mol\)
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how many moles nano3 would be produced from the complete reaction of 25…
\(3.12\)
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how many moles febr3 are required to generate 275 g nabr? 2febr3 + 3na2…
\(0.89\space mol\)
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how many moles of oxygen would be consumed to produce 68.1 g water? c₃h…
\(4.73\space mol\)
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how many moles fe2s3 would be produced from the complete reaction of 44…
\(0.76\)
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how many moles of no₂ form when 63.25 g n₂o₅ decompose? 2n₂o₅ → 4no₂ + …
\(1.17\space mol\) (rounded to three significant figures)
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how many moles of n2o5 are needed to produce 7.90 g of no2? 2n2o5→4no2 …
\(n_{N_2O_5}=\frac{1}{2}\times\frac{7.90}{46}\approx0.0859\space mol\)
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how many moles of o₂ are needed to completely react with 54.0 g of al? …
\(1.50\space mol\space O_{2}\)
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how many moles of o₂ are needed to completely react with 54.0 g of al? …
\(\frac{3\text{ mol O}_2}{4\text{ mol Al}}\)
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how many moles of o₂ are needed to completely react with 54.0 g of al? …
\(1\space mol\space Al\)
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how many moles of o₂ are needed to completely react with 54.0 g of al? …
\(26.98\ g\ Al\)
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what is the name for an aqueous solution of hbro3? hydrobromic acid bro…
B. bromic acid
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what is the name for an aqueous solution of hbr? hypobromous acid hydro…
hydrobromic acid
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directions: use these words to fill in the blanks below. words may be u…
6. less 7. more 8. Energy 9. joule 10. gravitational potential; kinetic 11. gravitational potential 12. chemical