化学
化学反応、化学量論、分子構造、元素の性質。
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question 9 1 point a reducing site of a carbohydrate is found anywhere …
D. A carbon 1 not involved in a glycosidic linkage
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11. match the statements with the pictures. answers can be used more th…
- atomic model proposed by Dalton: A - atomic model proposed by Rutherford: D - atomic model proposed by Bohr: C - atomic model based off of discoveries by Heisenberg and Schrödin…
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question 8 1 point which of the following is a branched carbohydrate? a…
B. amylopectin
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question 7 1 point the purpose of the malting step of the beermaking pr…
B. to get the barley seeds to produce enzymes to break down carbohydrate chains
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question 6 the purpose of the fermentation step of the beermaking proce…
C. to convert carbohydrates into ethanol
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17. choose the best answer. who theorized that cathode rays were smalle…
17. Thomson 18. Rutherford
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2 mark for review the complete photoelectron spectrum for an element is…
C. In its compounds, the element tends to form ions with a charge of +1.
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15. choose the best answer. who proposed the law of multiple proportion…
15. C. Dalton 16. C. Democritus
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13. choose the best answer. who proposed the law of definite proportion…
13. C. Proust 14. C. Thomson
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question 1 1 point which of the following is not a carbohydrate? a amyl…
B. amylase
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question 1 identify the electron configuration (5 correct) use your per…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d²
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10. drag and drop the words with the descriptions. the smallest unit of…
1. atom 2. ion 3. isotope 4. compound 5. electron
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9. choose all that apply. which five postulates were proposed by dalton…
- All atoms of a given element are identical. They have the same mass. However, atoms differ from other atoms in different elements by size, mass, and chemical properties. - Atoms…
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list 2 ways to protect your self from injury from each of the following…
- Heating and fire safety: Keep flammable materials away from heat sources; Install smoke - detectors. - Working with Chemicals and Tools: Wear appropriate PPE like gloves and gog…
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7. choose the best answer. which statement is true about water? water i…
7. Water is clear and polar and has poor thermal conductivity. 8. It is a molecule.
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4. choose the best answer. the density of engine oil is 850 kg/m³. is d…
4. A. intensive 5. A. physical 6. B. chemical
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look at the picture. then, choose the best answers. 2. choose the best …
2. A. extensive 3. A. chemical 4. B. physical
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3. (9) in a school with 300 people there is a finite math and chemistry…
90 #### (b)
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2. using the key choices, correctly identify the survival needs that co…
1. C. Nutrients 2. D. Oxygen 3. E. Water 4. D. Oxygen 5. E. Water 6. A. Appropriate body temperature
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which of the following particulate - level diagrams best represents an …
A.
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which sentence best summarizes the first paragraph? a. epidemics have p…
We need the first - paragraph to determine the correct answer.
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why is the ph of a 0.1 m solution of acetic acid in water higher than t…
Acetic acid is a better buffer than HCl.
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the electron - dot structure (lewis structure) for which of the followi…
A. H₂S
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9 mark for review which of the following molecules contains only single…
B. $C_2H_6$
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10 mark for review resonance is most commonly used to describe the bond…
B. $O_3$
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read the passage from sugar changed the world. no one could have seen i…
Advances in the production of sweeteners hastened the end of involuntary servitude.
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11 mark for review for which of the following molecules are resonance s…
A. $SO_2$
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question 8 of 10 which equation represents a chemical reaction that obe…
$C_6H_{12}O_6+6O_2 ightarrow6CO_2 + 6H_2O$
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12 mark for review auto saved at 11:07:32 diagram 1 diagram 2 which of …
A. Diagram 1, because all the atoms have a formal charge of 0.
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based on formal charges, which of the following is the best lewis elect…
A. $H_2NO$ structure with $:N$ single - bonded to $:O$ and two $H$ atoms bonded to $N$ and two lone pairs on $O$ and one lone pair on $N$
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is best represented by two or more resonance forms a becl2 b so2 c n2 d…
B. $SO_2$
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which of the following names a pair of elements that would likely form …
B. Ni and Cu, because Ni atoms would take the place of Cu atoms in the solid lattice.
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19. choose the best answer. how many valence electrons does iodine have…
7
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polar molecules have bonds with an overall negative charge. have electr…
have electric charges that are unequally distributed
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17. choose the best answer. who theorized that cathode rays were smalle…
17. Thomson 18. Water is clear and polar and has poor thermal conductivity.
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hydrocarbons are ______ and ______, whereas salts are ______ and ______…
E. nonpolar, hydrophobic; polar, hydrophilic
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15. choose the best answer. which statement is true about nitrogen gas,…
15. It is a molecule. 16. Dalton
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synthesis - what can we take away from all these patterns on the period…
See the above - filled tables for details.
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4. the graph shows the amount of potential energy between 2 hydrogen at…
The most stable point is the minimum point on the potential energy graph. Circle this minimum point on the graph.
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lattice enthalpy is defined as the δh° associated with the separation o…
B. It increases with the decreasing radii of the ions in the compound.
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the atomic masses of chlorine - 35 (75.780 %) and chlorine - 37 (24.220…
35.45 amu
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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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lattice energy can be defined as the $delta h^{circ}$ associated with t…
C. It increases with the decreasing radii of the ions in the compound.
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lattice enthalpy can be defined as the δh associated with the separatio…
B. It increases with the decreasing radii of the ions in the compound
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name: helen delacora date: 9/5 class period: 5 step 1: observation, que…
# Explicación: ## Paso 1: Observación cuantitativa Puedes medir la cantidad de vinagre y bicarbonato de sodio utilizados (por ejemplo, en mililitros o gramos), así como la altura …
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atomic model proposed by dalton atomic model proposed by rutherford ato…
- atomic model proposed by Dalton: A. (the solid - sphere model) - atomic model proposed by Rutherford: C. (shows a nucleus with electrons orbiting) - atomic model proposed by Boh…
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13. choose all that apply. which five postulates were proposed by dalto…
- Atoms of one element can combine in whole - number ratios with atoms of other elements to form compounds (law of multiple proportions). - All atoms of a given element are identi…
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element\telectronegativity h\t2.1 c\t2.5 s\t2.5 f\t4.0 cl\t3.0 si\t1.8 …
A. $CH_4<SiCl_4<SF_4$
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understanding column 1: physical property (pp), chemical property (cp),…
$138.1\ g$ (rounded to one decimal place)
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who discovered the nucleus? crookes rutherford proust thomson 11. drag …
1. Who discovered the nucleus? - B. Rutherford 2. Drag and drop the words with the descriptions: - the smallest unit of an element that maintains all of the chemical properties of…
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7. choose the best answer. who proposed that matter could only be divid…
7. A. Democritus 8. D. Democritus
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1. choose the best answer. who proposed the law of definite proportions…
B. Proust
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17. choose the best answer. an element that gains or loses an electron …
17. ion 18. isotope
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look at the model. then, choose the best answers. 12 choose the best an…
12. Bohr 13. 2
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8. what does the tool called symbol tell you about what parts are in an…
The sub - script number in an atomic symbol is the atomic number which gives the number of protons. The mass number (sup - script) is the sum of protons and neutrons. For a neutra…
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7. choose the best answer. the work of schrödinger and heisenberg helpe…
cloud model of the atom ### 8.
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6. choose the best answer. how many protons does oxygen have?
B. 8
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3. resonance structures for nitrite (no₂⁻) and nitrate (no₃⁻) are shown…
The bond order of $\text{NO}_2^-$ is 1.5 and the bond order of $\text{NO}_3^-$ is $\frac{4}{3}\approx1.33$.
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directions: for each of the following isotopes, write the isotope name …
| Isotope | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | | Sodium - 23 | 11 | 12 | 11 | | Sodium - 28 | 11 | 17 | 11 | | Nitrogen - 15 | 7 | 8 | 7…
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10) choose the best answer. how many protons does carbon have? carbon 1…
D. 6
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9) drag and drop to label the element. choices: atomic number, element …
6 - atomic number C - element symbol 12.0107 - atomic mass
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8) drag and drop to label the atom. choices: nucleus, neutrons, electro…
From top - left (assuming clockwise order): 1. electron cloud 2. nucleus 3. neutrons 4. protons 5. electrons 6. electron cloud
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hydrogen peroxide can be used to disinfect and clean surfaces around th…
2
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sulfuryl chloride is a substance used to make chemicals for killing ins…
1
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6) drag and drop the correct answers to each blank. part of the atom lo…
6) First row charge: +1; Second row location: nucleus, charge: 0; Third row charge: -1 7) electrons 8) Large central part: nucleus; Particles within nucleus: neutrons; Area around…
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sulfur dioxide is a gas released when volcanoes erupt. it can react wit…
2
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4) choose the best answer. which of the following is an anion? kcl l+ n…
CN− For question 5, the common atomic models in chronological order from oldest to latest are: - The Dalton's solid - sphere model (represented by the simple sphere). - The Thomso…
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in the atmosphere, nitric oxide forms when a lightning strike causes ni…
N: 2 O: 2
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consider the same reaction; 1 molecule of nitrogen (n₂) reacts with 3 m…
2
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1) drag and drop the terms with the definitions. the total number of pr…
1. atomic mass number 2. atomic number 3. isotope 4. ion 5. quantum numbers 6. uncertainty principle 7. wave - particle duality of matter
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ammonia is commonly used as a fertilizer for plants. it is made when ni…
| Chemical element | Number of atoms in reactants | Number of atoms in products | | ---- | ---- | ---- | | N | 2 | 2 | | H | 6 | 6 |
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review what is the only substance on earth that naturally occurs in all…
- What is the only substance on Earth that naturally occurs in all three states? Water - Which of the following does not contain hydrogen bonds? None of the above - What are the t…
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assignment content question 1 1 point if you dilution 2 ml of a solutio…
C. 2:6, D. 1:3
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10) draw a bohr model for sodium (na). sodium has three energy levels a…
A correctly drawn Bohr model of sodium with a nucleus containing 11 protons and 12 neutrons, 2 electrons in the first energy level, 8 electrons in the second energy level, and 1 e…
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6) type in the correct answers using the following bohr models. type th…
F: 2 Cl: 3 Br: 4
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question 5 3 pts which of the following drawings represents an argon at…
B. Option (b)
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5) type in the correct answers using the following bohr models. type th…
F: 7 Cl: 7 Br: 7
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a student wants to find out if salt affects the freezing point of water…
Freeze plain water and salty water, then compare temperatures
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question 4 3 pts calculate the number of aluminum atoms in 3.42 g of al…
1.20 x 10²² atoms
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3) choose all that apply. which three postulates are of the bohr model …
3. Electrons can only gain or lose energy by jumping to a higher or lower orbit., Electrons in each orbit contain a specific amount of energy., Electrons can only travel in discre…
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1) choose the best answer. a(n) ____ electron is an electron that occup…
1. A. valence 2. C. orbitals 3. (No answer provided as options are missing)
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3) look at the spectra. identify the unknown atoms. then, type your ans…
We cannot identify the unknown atoms without the spectra. Atomic emission spectra are discrete due to quantized electron energy levels in atoms.
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question 3 3 pts what group of elements does the shaded area in the fol…
alkali metals
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which of the following has 50 protons, 38 neutrons, and 50 electrons? $…
$^{88}_{50}Sn$ (corresponding to the option $\ _{50}^{88}Sn$ in the multiple - choice list)
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question 1 3 pts how many molecules of so₃ are in 4.85 x 10⁻² g of so₃?…
$3.65\times 10^{20}$ molecules
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4. wekesa, a grade 8 learner, wants to know why the symbol for aluminiu…
- Chemical symbols origin: Derived from English or Latin names. - Jewellery - making reasons: Malleable, ductile, luster. - Highest - value element: Gold, due to rarity, corrosion…
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wekesa, a grade 8 learner, wants to know why the symbol for aluminium i…
- Chemical symbols origin: Aluminium's symbol Al from its name start, nitrogen's symbol N from its name start. - Jewellery reasons: Malleability, attractive lustre. Gold has highe…
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directions: watch the video clip to complete the statements below. each…
- Each atom has a nucleus and electrons. - The nucleus contains protons and neutrons. - Electrons have a negative charge. - Protons have a positive charge. - Neutrons have a neutr…
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4. the pie - graph shows the abundance of the two kinds of silver atoms…
Average atomic mass of magnesium = $24.3096\ u$ Average atomic mass for iridium = $192.2484\ u$ Average atomic mass of lithium = $6.9459\ u$ Average atomic mass of chromium = $51.…
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use the partial periodic table to help answer the question. which eleme…
O, R
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average atomic mass overview the average atomic mass of an element can …
1. The average atomic mass of chlorine is $35.4442$ u. 2. The average atomic mass of copper is $63.548$ u. 3. The identity of the atoms is calcium (Ca). The difference in mass num…
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use the partial periodic table to help answer the question. which eleme…
O. Option Text, R. Option Text
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use the partial periodic table to help answer the question. which eleme…
F. Option Text, Y. Option Text, Z. Option Text
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2. copy the table below in your exercise book. use the table to classif…
1. | Atom | Element | Compound | Molecule | |---|---|---|---| | Oxygen (O) | Oxygen | | Oxygen gas ($O_2$) | | | | Water ($H_2O$) | Water ($H_2O$) | | | | Carbon(IV) oxide ($CO_2$…
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use the partial periodic table to help answer the question. which eleme…
(Assuming R and B are metalloids based on their position relative to the staircase - like region in a typical periodic table layout where metalloids are located) R, B
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periodic table worksheet 1. tell which element is located in the follow…
a. Zirconium (Zr) b. Beryllium (Be) c. Tungsten (W) d. No element e. Tin (Sn) f. Zinc (Zn) g. Francium (Fr) h. Polonium (Po) i. Chlorine (Cl) j. Silver (Ag) k. Vanadium (V) l. Pla…
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question 1 (1 point) given the chemical symbol below, what does the bot…
b. Protons
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question 4 (1 point) given the following elemental symbol, how many pro…
C. 8 protons, 8 neutrons
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assessment activity 11 during a class presentation, david used the diag…
a) The diagram with only yellow - colored spheres represents an element. The diagram with yellow and black spheres bonded together represents a compound. b) The reason for the ele…
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this passage describes a chemical reaction. read the passage. then, ans…
A. ammonia ($NH_3$) B. sodium hypochlorite ($NaClO$)