化学
化学反应、化学计量、分子结构与元素性质。
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multiple - choice question what types of elements make up covalent bond…
nonmetal + nonmetal
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11) drag and drop the terms with the definitions. subatomic particles t…
subatomic particles that do not have an electric charge - neutrons positively charged subatomic particles - protons negatively charged subatomic particles - electrons the center o…
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(hue is a colors name.) split - complementary is made up of three hues.…
Describes split - complementary color scheme.
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14. what is the primary reason electron pairs repel each other? a. they…
C. They are negatively charged.
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13. which of the following statements is true about nonpolar molecules?…
A. They do not have significant dipole moments
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12. which molecular geometry is associated with a central atom having s…
c. Octahedral
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11. which molecular shape is associated with a central atom that has th…
A. Trigonal pyramidal
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10. which of the following molecules has a trigonal pyramidal shape? a.…
c. Ammonia ($NH_3$)
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9. what is the predicted molecular geometry of a molecule with five bon…
B. Trigonal bipyramidal
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8) draw a picture of daltons model of an atom and upload the file here …
You would draw a simple solid sphere to represent Dalton's model of an atom. Since this is a drawing task and not something that can be directly provided in text, the description …
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8. which of the following is an example of an ionic compound? a. sodium…
A. Sodium chloride (NaCl)
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7. which of the following substances is soluble in a polar solvent like…
B. Ethanol ($C_2H_5OH$)
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7) choose all that apply. select the five postulates proposed by dalton…
- Atoms cannot be created or destroyed (law of conservation of mass) nor can they be divided into smaller particles. - All matter is composed of extremely tiny particles called at…
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2. which molecule is nonpolar due to equal sharing of electrons? a. oxy…
a. Oxygen ($O_2$)
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5) choose the correct scientific notation. what was a limitation of dal…
5. The model was much simpler than the real system of an atom. 6. - proposed by Joseph Proust and known as the law of constant composition: law of definite proportions - proposed …
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3) choose the best answer. which law is also one of daltons postulates?…
3. law of conservation of mass 4. billiard ball model
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1) choose the best answer. which law did dalton propose? law of conserv…
1. C. law of multiple proportions 2. C. experiments with different gas pressures
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the extraordinary properties of water a water molecule (h2o) is made of…
three; oxygen atom; hydrogen atoms
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18. choose the best answer. the relationship between the mass and volum…
18. density 19. It is a molecule.
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16. choose the best answer. glucose contains both carbon and hydrogen. …
16. B. organic 17. B. reactivity, C. flammability
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14. choose the best answer. the smallest unit of an element that mainta…
14. C. atom 15. A. Scale
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12. when a substance changes in a way that does not change its composit…
12. D. physical 13. save time and money before making a product, study things that are very small
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iron oxide (rust) does not contain carbon. iron oxide is a(n) ____ comp…
1. A. inorganic 2. A. extensive
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8. in order for elements to form a compound, which two things must happ…
For the first question: must chemically combine, must be in definite proportions For the second question: Water is clear, Water is polar, Water has poor thermal conductivity
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look at the picture. then, choose the best answers. 4. choose the best …
4. extensive 5. chemical 6. physical 7. intensive
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3. choose the best answer. a(n) ____ property does not depend on the am…
D. intensive
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1. choose the best answer. a(n) ____ substance is made up of two or mor…
1. D. compound 2. D. chemical
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10) choose the best answer. margaret hutchinson rousseau was a pioneer …
10) chemical engineering 11) limitations of modeling an approximation of what is observed - simplicity unable to account for different outcomes that happen in real systems - varia…
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8) choose the best answer. which scientist uses models to invent produc…
8) chemical engineer 9) to understand how polyethylene behaves when shaped
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7) choose the best answer. what is the purpose of developing the follow…
to learn more about the process of forming a precipitate
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1.3a models of the atom select the best answer for each of the followin…
5 - 1: a. Contains separated particles 5 - 2: b. Can be disrupted 5 - 3: c. Vaporization 5 - 4: d. Gas to liquid
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a scientist discovers a new chemical on the earth. how would molecular …
by showing the chemical's structure
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a student conducts an experiment to determine how the temperature of wa…
perform multiple trials for each measurement instead of just one
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how do you distinguish a compound verses an element? what is the differ…
An element consists of one - type of atom and is indivisible by chemical reactions. A compound is formed by chemical combination of different elements in a fixed ratio.
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2. describe the property of water that is indicated by the data. how is…
2. Water has a high specific heat capacity due to polar water molecules and hydrogen - bonding between them. 3. The sand would feel warmer because it has a lower specific heat cap…
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name the following hydrates 27. cr₂(co₃)₃•h₂o 28. caso₄•2h₂o 29. fepo₄•…
27. Chromium(III) carbonate monohydrate 28. Calcium sulfate dihydrate 29. Iron(III) phosphate trihydrate 30. $CuSO_3\cdot 5H_2O$ 31. $Co_2(CO_3)_3\cdot 4H_2O$ 32. Lead(II) sulfide…
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each layer of earth has different physical and chemical properties. thi…
Composition of the layers
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5) choose all that apply. which two of these are required for a compoun…
5) C. must chemically combine, D. must be in definite proportions 6) Water's polarity causes hydrogen - bonding between water molecules, resulting in high surface tension, high he…
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istry a phs (ne) / unit 2 - atomic structure which two of these are pro…
Water has poor thermal conductivity. Water is clear. Hydrogen atoms are not perfectly held on opposite sides of oxygen.
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water is polar waters unique properties are due to its being a polar mo…
Drag the negative symbol (-) to the oxygen - containing side (red sphere) and the positive symbol (+) to the hydrogen - containing side (blue spheres).
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1) drag and drop the definitions with the terms. a substance made up of…
1. "a substance made up of two or more atoms that are chemically bonded together" - molecule; "a compound that contains carbon and hydrogen" - organic compound; "a compound that d…
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give formulas for the following ionic compounds: 22. cobalt(ii) nitrate…
22. $Co(NO_{3})_{2}$ 23. $Ag_{3}N$ 24. $Al(C_{2}H_{3}O_{2})_{3}$ 25. $BaSO_{4}$ 26. $Cu_{2}CrO_{4}$
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7) look at the picture. then, answer the question. is density an intens…
intensive property
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6) look at the picture. then, answer the question. the density of epiba…
physical property
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4) look at the picture. then, answer the question. the frog is blue. is…
physical property
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3) check the box if the statement describes a chemical property or a ph…
malleability: Physical property boiling point: Physical property color: Physical property ductility: Physical property toxicity: Chemical property density: Physical property react…
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name the following ionic compounds 17.fe2o3 18.hg2s 19.(nh4)3po4 20.pb(…
17. Iron(III) oxide 18. Mercury(I) sulfide 19. Ammonium phosphate 20. Lead(IV) carbonate 21. Chromium(III) oxalate
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2) drag and drop the terms with the definitions. occurs when two or mor…
"occurs when two or more substances combine to make a new substance": chemical change "a relationship between the mass of matter and the space or volume that it occupies": density…
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1) drag and drop the terms with the definitions. anything that has mass…
1. matter 2. atom 3. pure substance 4. atom (closest in the given options to the concept of the smallest unit of matter with properties) 5. compound
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give formulas for the following acids: 13. hypochlorous acid 14. hydrob…
13. $HClO$ 14. $HBr$ 15. $HIO_4$ 16. $HNO_2$
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practice 1. fill in the following table with the correct information. |…
| Atom/Element | Atomic # | # of Protons | # of Neutrons | Mass # | |---|---|---|---|---| | Hydrogen - 1 | 1 | 1 | 0 | 1 | | Hydrogen - 2 | 1 | 1 | 1 | 2 | | Helium - 3 | 2 | 2 | …
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name the following acids: 9. hclo3(aq) 10. h2cr2o7(aq) 11. hc2h3o2(aq) …
9. Chloric acid 10. Dichromic acid 11. Acetic acid 12. Sulfuric acid
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give formulas for the following binary covalent compounds: 5. tetrasulf…
5. $S_4F_{10}$ 6. $ClI_3$ 7. $N_2S_5$ 8. $SiH_4$
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name the following binary covalent compounds: 1. s₂o₆ 2. ccl₄ 3. p₂s₇ 4…
1. Disulfur hexoxide 2. Carbon tetrachloride 3. Diphosphorus heptasulfide 4. Boron tribromide
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predicting characteristics by metal type. use the periodic table to loc…
Lithium: is most reactive Barium: has 2 valence electrons Cobalt: forms colorful compounds
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2.14 indicate if the zeros are significant in each of the following mea…
a. Both zeros are significant. b. Both zeros are significant. c. None of the zeros are significant. d. None of the zeros are significant. e. The zero is significant.
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comparing alkali metals with alkaline earth metals match the property w…
Soft - Alkali Metals Extremely reactive - Alkali Metals 1 valence electron - Alkali Metals 2 valence electrons - Alkaline Earth Metals Harder, more dense - Alkaline Earth Metals
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group 18 is known as the ____? 5 points kings and queens of the periodi…
1. C. The Noble Gases 2. A. H.G.J. Moseley 3. D. neutrons
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as you move from left to right across the second period of the periodic…
1. Ionization energy increases 2. Group 1 3. Mercury
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compared with the electronegativities of the elements on the left side …
C. higher
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how does atomic radius change from top to bottom in a group? it tends t…
It tends to increase
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juliet started working with a radioactive substance. in 1997, she start…
cobalt - 60
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radioactive isotope|half - life rubidium - 91|58.4 seconds iodine - 131…
rubidium-91
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a poem with fourteen lines and a mixed rhyme scheme is a foil couplet s…
D. sonnet
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question from a molecule point of view, how is liquid water at 100° c s…
Similarity: Both consist of H₂O molecules. Difference: In liquid water, molecules are closer - packed with stronger intermolecular forces and less freedom of motion; in water vapo…
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who arranged the elements according to atomic mass and used the arrange…
1. D. Dmitri Mendeleev 2. D. Kr 3. A. In, 49 protons, 49 electrons
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a repetition of properties occurs when elements are arranged in order o…
1. periodicity 2. Metal
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classify the figures shown above as depicting a chemical reaction, a ph…
Without specific labels for each image's classification, here's a general way to think: - Chemical Reaction: Images with chemical equations like $2H_2O_2(aq) ightarrow 2H_2O(l)+O_…
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indicate which three of the following five are homogeneous mixtures. ch…
A. Sweat, B. Compressed air in a scuba tank, E. An 18K gold ring
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a sample of neon in two different states of matter are shown. the arrow…
Molecular kinetic energy
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4. in the combustion of propane (c3h8), which gases are produced? oxyge…
D. Carbon dioxide and water vapor
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the rungs are held together by ___ bonds covalent ionic molecular
covalent
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06 question (1 point) what is the chemical formula for the following co…
$C_6H_4Cl_2$
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read the paragraph, then choose the word that best completes the senten…
C. examined
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read it! scientist albert einstein is revered as one of the greatest ph…
D. intersected
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the case of the missing bicycle chief investigator: manna case details …
A girl with pants on holiday, with empty hands, having an indoor hobby, happy, standing, likes ping - pong and drives.
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author to her book anne bradstreet thou ill - formd offspring of my fee…
C. A, A, B, B
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which statement best describes the rhyme schemes of the author to her b…
Both poets use couplets for rhyme scheme and structure, inverting sentences when needed to maintain the rhyme.
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take the quiz below to see how well you know the vocabulary from this m…
A. waxes
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express your answer to four significant figures and include the appropr…
10.81 amu
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take the quiz below to see how well you know the vocabulary from this m…
A. mono - unsaturated fat
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which statements accurately describe atoms? check all that apply. atoms…
Atoms were named in the fifth century BCE.
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complete the statement. matter is made up of small particles called
atoms
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take the quiz below to see how well you know the vocabulary from this m…
A. liquid
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1. which resource would be most useful for identifying whether a sample…
C. Mineral Identification Chart
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sort these real - world examples by separation technique. items (5 item…
Filtration: Removing dust particles from the air, Separating coffee grinds from water Distillation: Preparing gasoline from crude oil, Preparing drinking water from seawater Chrom…
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part 2: adding acetic acid first, lets try adding some acetic acid to t…
pH decreased, meaning the solution is more acidic
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complete this assessment to review what youve learned. it will not coun…
2.5 degrees
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02 question (3 points) use the particulate representations of matter a …
Elements: C, D, I Compounds: B, F, G, H Mixtures: A, E
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which of the following representations depict homogeneous mixtures? (th…
A. Saline, D. Brass
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which type of molecule contains two atoms bonded together? (1 point) si…
simple molecule
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introduction to chemistry online practice complete this assessment to r…
C. filtration and evaporation
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which objective would be best achieved through evaporation? (1 point) s…
separating salt from seawater
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introduction to chemistry online practice complete this assessment to r…
filtration
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introduction to chemistry online practice complete this assessment to r…
B. lemonade with ice
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introduction to chemistry online practice complete this assessment to r…
density
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introduction to chemistry online practice. complete this assessment to …
Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change.
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introduction to chemistry online practice complete this assessment to r…
composition of the matter
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he author to her book\ and \a hymn to the evening\ thy visage was so ir…
The author found the appearance of her book very annoying.
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part d what is the atomic symbol of an isotope of bismuth with 125 neut…
\(^{208}_{77}\text{Ir}\)