化學
化學反應、化學計量、分子結構與元素性質。
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what is the name of the hydrocarbon ch₃(ch₂)₆ch₃? butane decane octane …
C. octane
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which activity most likely involves the direct use of saturated hydroca…
burning natural gas
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a. density: is the mass of substance b. solubility: is the ability of o…
1. At the melting - point, a material changes from solid to liquid. At the boiling - point, a material changes from liquid to gas. 2. Flammability.
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which molecule has an octahedral geometry due to sp³d² hybridization? a…
C. Sulfur hexafluoride ($SF_6$)
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how is addition polymerization different from condensation polymerizati…
During addition polymerization, all the atoms in the monomer units are retained in the polymer; condensation polymerization results in the loss of a small molecule, such as water.
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which molecule is an example of sp³ hybridization? a. phosphorus pentac…
D. Methane ($CH_4$)
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is this an aromatic hydrocarbon? why or why not? yes, because the carbo…
No, because the carbon chain has no double bonds
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answer the questions in the table below about this molecule: what is th…
What is this molecule's chemical formula?: $C_4H_8O$ How many $CH_3$, $CH_2$, and $CH$ groups are in this molecule? $CH_3$: 1 $CH_2$: 2 $CH$: 0
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which reaction should be used to convert propene into an alkyl halide? …
A. addition
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answer the questions in the table below about this molecule: what is th…
What is this molecule's chemical formula? $C_{10}H_{12}$ How many $CH_3$, $CH_2$, and $CH$ groups are in this molecule? $CH_3$: 0 $CH_2$: 4 $CH$: 4
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which is composed of alkenes? welding torch fuel polystyrene cups propa…
polystyrene cups
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which is composed of alkenes? welding torch fuel polystyrene cups propa…
None of the above options are correct as they do not contain alkenes.
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true or false 0.5 points as a solution is stirred, it forces more inter…
False
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what are geometric isomers? compounds that have the same types of atoms…
compounds that have the same atoms arranged in the same order, but with different three - dimensional orientations
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which class of organic compound is commonly used in perfumes? amine alc…
C. ester
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what is the name of this hydrocarbon? 1 - methylbutane 2 - methylbutane…
B. 2 - methylbutane
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which compound can be used to preserve biological specimens?
The first compound (HCHO - formaldehyde)
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what is the name of this hydrocarbon? hexane heptane octane pentane
D. pentane
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for this assignment, your teacher will give you a solubility graph. if …
Saturated - A solution that contains the maximum amount the solvent can dissolve at a given temperature Unsaturated - A solution that contains less solute than the maximum amount …
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which is a characteristic of condensation polymerization? monomers are …
Each monomer has more than one functional group.
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estradiol is best described as which of the following? an alkyne an alk…
D. an aromatic
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a company has a tanker truck to transport liquid chemicals. the functio…
The tanker truck has 6,325 gallons of chemicals when it arrives at the facility. It is then drained at a rate of 7,150 gallons per hour.
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what is the chemical formula for acetic acid? cho c₂h₄o₂ c₂oh c₂o₂h
B. $C_{2}H_{4}O_{2}$
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what would a substance that could undergo condensation polymerization m…
D. two alcohol functional groups
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what is a disadvantage of using a space - filling model to show a chemi…
Space - filling models do not identify the number and type of bonds.
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which molecule has a structure that is most like aspirin? propene octyn…
C. benzene
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students in mr. kleins chemistry class are conducting an experiment to …
A. team 1
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jacob likes to drink hot tea, and his friend likes to drink cold tea. j…
1. Does white sugar dissolve more quickly in warm water or in cold water? 2. Does white sugar dissolve in warm water more quickly than brown sugar does?
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12. a particular chemical signal being transmitted to a neuron is said …
13. d. central, peripheral nervous systems 14. d. faster, a shorter duration 15. c. double - blind 16. d. longitudinal 17. d. Motor coordination 18. a. scientific study of the min…
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12. give an example of a situation where knowing the density of a subst…
In construction for material - selection (e.g., bridge - building) or in shipping for cargo - loading.
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draw the simplest possible set of curved arrows that shows how the stru…
1. Draw an arrow from the lone - pair on N to the C atom to form a double - bond. 2. Draw an arrow from the C - O bond towards the O atom to give the O atom a lone - pair and a ne…
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1. the most life - threatening hazards on a construction site typically…
1. d. chemical burns 2. d. have a qualified person use a defibrillator 3. c. are responsible for most electrocution deaths due to the frequency of contact 4. c. involuntary moveme…
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5. add/remove protons, electrons and neutrons to discover what affects …
The mass number of an ion or atom is affected by changing the number of protons and neutrons. Adding or removing protons changes the element and its mass number, and adding or rem…
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the passage below describes an experiment. in each of three bowls, tom …
The question that the experiment can best answer is "Does the size of the flame used to heat water affect the time it takes the water to evaporate?"
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prefix means? endo = exo = energy released or absorbed example of this …
| Prefix means? | Endo = | Exo = | |--|--|--| | Energy released or absorbed | Energy absorbed | Energy released | | Example of this reaction | Photosynthesis | Combustion | | Acti…
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7. which statement best describes a mixture? a. it is made of only one …
7. C. Its parts can be separated by physical means 8. Use a magnet to attract the iron filings.
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in the author to her book, the main reason bradstreet uses inversion is…
# Breve explicación: En "The Author to Her Book", Bradstreet utiliza la inversión para completar el esquema de rimas. La inversión es una técnica literaria que altera el orden nor…
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9. which of the following is not a chemical property? a. reactivity wit…
B. Melting point
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3. add/remove protons, neutrons and electrons to determine which partic…
a. an equal number b. more c. fewer
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which of the following is a physical change? a. roasting marshmallows o…
D. magnetizing an iron rod
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hydrochloric acid is used to produce fertilizers and dyes, to pickle an…
B. All of these are chemical properties of hydrochloric acid.
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incorrect. the chemical symbol is wrong. an atomic cation with a charge…
F⁺
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cumulative exam cumulative exam review active what medium is the work o…
Without more visual analysis, it's hard to say the medium. Regarding color and value, one can note the overall color scheme and the contrast between light and dark areas in the ar…
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4. what type of reaction is shown in the graph? how do you know? 5. how…
It is an exothermic reaction. We know this because the energy of the reactants is higher than the energy of the products and energy is given out to the surroundings. ### 5.
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the passage below describes an experiment. sophie had medicine tablets …
The question that the experiment can best answer is "Do whole tablets fizz for a longer period of time than crushed tablets?"
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answer the following questions. remember to think about classifying mat…
1. Physical - state: $CuSO_4$ is solid, $CuSO_4(aq)$ is in solution. 2. Particle - interaction: In $CuSO_4$, ions in lattice; in $CuSO_4(aq)$, ions surrounded by water and mobile.…
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answer the following questions. remember to think about classifying mat…
1. $CuSO_4$ is solid with fixed ion - lattice; $CuSO_4(aq)$ is an aqueous solution with hydrated, mobile ions. 2. Air components are not chemically bonded and proportions can vary…
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15) this has definite shape and volume. 16) this is a state of matter w…
15) Solid 16) Gas 17) Conservation 18) 2 19) 6
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32) reactions that can not occur spontaneously are .. oa) exothermic ob…
32) B. endothermic 33) B. endothermic 34) A. exothermic 35) B. endothermic
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28) this measures the amount of a product obtained from a reaction. 29)…
- 29) A. actual yield - 30) D. how efficient the reaction is - 31) B. theoretical yield
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2. label the parts of a chemical reaction. you can also check out this …
A: Coefficient of $Mg$ (2) B: Reaction arrow C: Coefficient of $MgO$ (2) D: Reactants ($2Mg$ and $O_2$) E: Products ($2MgO$)
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22) the calculation of quantities in a chemical reaction is called stoi…
22) True 23) True 24) True 25) A. 1:1
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19) balance the following chemical equation. what number should be on t…
19. 6 20. 1 21. 43.6 g
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using the brightline emission spectrum chart below, identify the elemen…
B. Lithium and strontium are in the mixture. Cadmium is not in the mixture
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15) this has definite shape and volume. 16) this is a state of matter w…
15) Solid 16) Gas 17) Conservation 18) 2
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multiple choice 1 point how many atoms are in 2.17 moles of strontium? …
1.31×10²⁴ (corresponding to the last option)
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multiple choice 1 point how many molecules of water are in 1.8 moles of…
1.1x10^24 (corresponding to the second option)
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12) two ionic compounds exchange ions, producing 2 new ionic compounds.…
12. B. Double - replacement reactions 13. C. Single - replacement reactions 14. A. Combustion reactions
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multiple choice 1 point how many atoms are in 0.23 moles of calcium? 1.…
$1.4\times 10^{23}$ (corresponding to the second - option in the multiple - choice list)
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7) a starting material in a chemical reaction. 8) ending materials in a…
7. Reactants 8. Products 9. E. Synthesis reactions 10. A. Combustion reactions 11. D. Decomposition reactions
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2) the temperature at which a liquid changes to a gas. 3) miscibility i…
2. Boiling - point 3. Two or more 4. Solubility 5. C. less 6. Intramolecular forces are within - molecule (covalent, ionic, metallic) holding atoms; intermolecular forces are betw…
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which of these describes the attraction between molecules of different …
C. adhesion
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what was the main reason for the severe decline in the bald eagle popul…
Chemicals such as DDT caused thinning of egg shells which caused the population to decline.
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do you think the chemical properties of the aluminum change as you cut …
no
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what are the properties of the aluminum in the can? check all that appl…
It conducts electricity well. It is solid. It does not react easily with water or air.
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which atomic model states that it is impossible to know the exact locat…
electron - cloud model
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what is the smallest possible value of the principal quantum number n f…
3
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list all possible values of the magnetic quantum number (m_l) for a 4f …
$-3,-2,-1,0,1,2,3$
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compare the modern (electron cloud) model of the atom with bohrs atomic…
B. Bohr’s model electrons cannot exist between orbits, but in the electron cloud model the location of the electrons cannot be predicted. C. The modern model explains all availabl…
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which statements are true of the electron cloud model? check all that a…
It is considered the modern atomic model. It describes the probable locations of the electrons.
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which option is an example of a chemical property? rusting ability melt…
rusting ability
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which option is an example of a chemical property? color melting point …
flammability
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which option is an example of a physical property? ph toxicity flammabi…
freezing point
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which option is an example of a physical property? rusting ability ph r…
conductivity
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which properties cause chemical reactions? physical properties chemical…
B. chemical properties
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what is a requirement for the chemistry of replacement blood vessels? a…
D. all of the above
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what is the name given to a chemical substance that is used to treat di…
C. drug
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which is not one of the groups of metals? o halogens o alkali o alkali …
A. Halogens
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although non - metals are a small portion of the periodic table, they c…
True
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scientists made the following two observations about emission spectra: …
The Bohr model posits electrons in fixed energy orbits. Transitions between these orbits release photons with energies corresponding to the energy differences of the orbits. Each …
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which of the following elements is an alkali metal? - sodium - magnesiu…
A. sodium
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3. sulfur, which has the symbol s, is a solid at room temperature. it c…
Sulfur will react less vigorously than fluorine with iron wool.
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carbon and other nonmetals are found in which area of the periodic tabl…
on the right side
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the element neon is from what group? noble gas halogen alkali earth met…
Noble Gas
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the element ruthenium is in what element group? alkaline earth alkali m…
Transition metal
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2. the valence electrons in atoms are shielded from the attractive pull…
Yes, the reactivity of halogens relates to the shielding effect. As we move down the halogen group, the shielding effect increases, reducing the effective nuclear charge on valenc…
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the element germanium is in what element group? nonmetal metalloid metal
B. Metalloid
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classify the following as either primarily pure chemistry or primarily …
pure chemistry
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sci_phys_cfa1_periodictableatomicstructure_sy26 due friday by 11:59pm p…
Oxygen (O)
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which is a characteristic of addition polymerization? each monomer has …
The polymer contains all the atoms in the monomer units.
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a student writes the following explanation of how certain molecules are…
C. polymerization
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which term best describes this reaction? n c = c h h ch3 h → c c h h ch…
B. addition polymerization
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multiple meanings a solution can be a mixture within a solvent where th…
Polar and ionic molecules
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this reaction eventually forms this product. which type of reaction is …
condensation polymerization
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many repeating, simple subunits are joined together. what is the most l…
B. a polymer
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which best explains the difference between a monomer and a polymer? a m…
D. A polymer is larger than a monomer
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which of the following best describes the relationship between alcohol …
B. Fermentation is a process that uses substances such as bacteria or yeast to change the sugars of fruits or grains into alcohol.
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elimination substitution addition polymerization condensation polymeriz…
addition polymerization
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consider the following diagram of a chemical reaction. initiation r - o…
A. a polymer
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during a reaction, the -oh group of an alcohol is replaced by a chlorin…
D. substitution