Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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determine whether the following equation is balanced- 2 na + 2 h₂o → 2 …
The equation is balanced.
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the medical term type your answer... means profuse sweating. true or fa…
1. Hyperhidrosis 2. True 3. B. Cryotherapy
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determine whether the following equation is balanced- 4 p + 2 o₅ → 2 p₂…
The equation is balanced.
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determine whether the following equation is balanced- ch4 + 3 o2 → co2 …
The equation is not balanced because there are more oxygen atoms in the reactants than the products.
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determine whether the following equation is balanced- 2 nacl + f₂ → 2 n…
The equation is balanced.
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determine whether the following equation is balanced- n₂ + 4 h₂ → 2 nh₃…
The equation is not balanced because there are more hydrogen atoms in the reactants than the products.
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periodic table 5.4 1. what is the name of the horizontal groupings call…
1. Periods 2. Groups, Families 3. Non - metals 4. Metals 5. 7 6. 18 7. To keep the table compact and organized 8a. Lanthanide series 8b. Actinide series 10. Alkali metals 11. Alka…
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part iv: diagram labeling (5 items) instruction: label the following si…
1. Sodium - Alkali Metal 2. Helium - Noble Gas 3. Silicon - Metalloid 4. Iron - Metal 5. Oxygen - Non - metal
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from column 2, select the term or phrase that best matches each item in…
14. c. acetylsalicylic acid 15. b. aspirin 16. a. Bufferin 17. d. contains information about drug products provided by pharmaceutical companies 18. f. system that adopts generic n…
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the temperature at which a liquid becomes a gas is the ____ point. a) f…
B. boiling
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part iii: identification (10 items) write the correct answer. 1. scient…
1. John Newlands 2. Dmitri Mendeleev 3. Law of Triads 4. 8 5. Atomic number 6. Group/Family 7. Period 8. Dmitri Mendeleev 9. Bromine 10. High reactivity
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10. what was a limitation of the law of octaves? a. it worked only for …
1. T 2. F 3. T 4. T 5. F 6. T 7. F 8. T 10. C. It worked only for light elements
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6. what does mendeleevs periodic law state? a. properties of elements a…
6. A. Properties of elements are periodic functions of their atomic masses 7. C. Mendeleev's Periodic Law 8. A. Groups/Families 9. A. A musical scale
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2. what pattern did newlands observe in the law of octaves? a. every 3r…
2. C. Every 8th element has similar properties 3. B. Mendeleev 4. B. 3 5. D. Mendeleev
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the energy value listed for foods refers to the _. a total amount of ch…
B. amount of energy available as fuel for the body
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pratique - toi encore plus! 20. pour prévenir une infection buccale, tu…
20. 0,4% 21. Environ 0,78% 22. Environ 20,83 mL 23. 787,5 mg
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click to review the online content. then answer the question(s) below, …
The type of energy associated with food is chemical energy. It is stored in the chemical bonds of molecules in food. When used to do work, it is converted into mechanical and heat…
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15. complétez les énoncés suivants : a) une boisson protéinée à 200 g/l…
15.a: 20, 100 15.b: 1, 500 15.c: 10, 250 16: 48 g, 0,02 g/L, 12,8 g, 200 g/L, 0,095 g 17: 17,91 g/L 18: 3,1 g 19: 13,63 L
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10. calcule la quantité dalcool dans chacune de ces boissons : (arrondi…
1. **Question 10 - a**: - # Explanation: - ## Step1: Utiliser la formule de la concentration en volume - volume La concentration en volume - volume $C_{V/V}=\frac{V_{solute}}{V_{s…
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6. quelle est la quantité de sel contenue dans 250 ml dune solution dea…
6. 3 g 7. 10 g, 1250 g, 0,75 g, 61,65 g 8. 178 mg 9. 24 g
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13 of 15 cva mortality rates have declined over the past 15 years. more…
1. survive 2. neurons 3. injury 4. ischemic 5. defects
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your friend asks you to explain how you know that a particular work is …
Minimalism uses a stripped - down design and emphasizes layouts of simple geometric shapes.
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part 2. procedure: 1. use the phet simulation, \build an atom.\ 2. chec…
| Number of Protons | Number of Neutrons | Number of Electrons | Name of the Element | Mass Number | | ---- | ---- | ---- | ---- | ---- | | 1 | 0 | 0 | Hydrogen | 1 | | 1 | 0 | 1 …
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question 5 (1 point) listen chromatography samples should be kept in th…
d) all the above
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19. homework a. lespagnol b. les sciences po c. la gestion d. un devoir…
19. D. un devoir 20. B. la chimie
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d french 8. difficile a. difficult b. economiques c. a grade d. scholar…
9. C. useful 10. B. foreign languages
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1. robert boyle was born in what country? 2. where was boyle schooled? …
1. Ireland 2. Eton College (and through private tutors during travels) 3. Mechanical philosophy of science 4. Chemistry 5. Properties of air (especially its elasticity) 6. For a g…
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question 5 (1 point) listen the leading edge of the solvent on a chroma…
B. solvent front
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question 4 (1 point) listen what is chromatography? a) a technique to m…
D. A technique to separate the components of a mixture based on their solubility in a solvent.
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3. according to the equation for the ninhydrin reaction with an amino a…
The $\alpha$-amino group and $\alpha$-carboxyl group of the amino acid give rise to the products in the ninhydrin - amino acid reaction.
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10. balance each of the following chemical equations. a. nacl(s) + so2(…
a. \(4NaCl(s)+2SO_2(g)+2H_2O(g)+O_2(g) ightarrow 2Na_2SO_4(s)+4HCl(g)\) b. \(3Br_2(l)+I_2(s) ightarrow 2IBr_3(s)\) c. \(Ca(s)+2H_2O(g) ightarrow Ca(OH)_2(aq)+H_2(g)\) d. \(2BF_3(g…
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suppose an element has two naturally occurring isotopes $_{20}^{42}x$ a…
$44.805$
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8. balance the equation for the reaction of potassium with water, k(s) …
- $2K(s)+2H_2O(l) ightarrow H_2(g)+2KOH(aq)$ - $Na_2SO_4(aq)+CaCl_2(aq) ightarrow CaSO_4(s)+2NaCl(aq)$ - $3Fe(s)+4H_2O(g) ightarrow Fe_3O_4(s)+4H_2(g)$ - $Ca(OH)_2(aq)+2HCl(aq) ig…
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7. balance each of the following chemical equations. a. fecl3(aq) + koh…
a. $\text{FeCl}_3(\text{aq}) + 3\text{KOH}(\text{aq}) ightarrow\text{Fe(OH)}_3(\text{s})+3\text{KCl}(\text{aq})$ b. $\text{Pb}(\text{C}_2\text{H}_3\text{O}_2)_2(\text{aq})+2\text{…
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1. what are the three phases of tissue healing? 2. how long does each p…
1. Inflammatory phase, proliferative phase, remodeling phase. 2. Inflammatory: 1 - 5 days; Proliferative: 3 days - 3 weeks; Remodeling: months - years. 3. Remove debris, pathogens…
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complete the text with the best conjunctive adverb. when hunting prey a…
C. Also
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b. why is it still beneficial for chemists to understand as many period…
It helps in prediction of element properties, reaction understanding, and new - compound design. ### c.
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which diagram shows the relation between the atomic numbers (z) and the…
A. The graph with a downward - sloping line as r decreases with an increase in Z.
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which of the following is the atomic radius of chlorine if the internuc…
C. 100 pm
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arrange the following atoms in order of decreasing atomic radius: ga, a…
d. Sn, Sb, Te, Ga, As
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which of the following best explains why atomic radius decreases left t…
A. Protons are added to the nucleus, and the force of attraction on electrons is stronger
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in the periodic table, the element with the largest atomic radii is fou…
A. The lower left
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which of the following has the largest atomic radius among group 16 ele…
C. Po
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what will be the atomic radius of copper, if the distance between two a…
B. 128 pm
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____ has the smallest atomic radius. a silicon b tin c lead d germanium
a. Silicon
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which of the following has the smallest atomic radius? a ga b b c al d …
e. F
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which of the following halogens has the largest atomic radius? a bromin…
c. Iodine
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what happens to an atom when it gains electrons? a it becomes a positiv…
d. It becomes a negatively charged ion.
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is an atom that has a positive or negative charge because it has unequa…
Ion
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what would be the name for li⁺? a lithide b lithium c lithium(ii) ion d…
d. lithium ion
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an iodine atom has 53 protons. how many electrons does an iodine anion …
A. at least 54
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what is the name of the ion represented by the following symbol? o^{2 -…
C. oxide
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ways in which ions may form include ________. select all that apply a e…
A. exposure to radiation B. transfer of electrons between atoms
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positively charged ions are called _____. enter the answer
Cations
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a) what will be the temperature change if a (1255 j) amount of heat is …
a) $\Delta T\approx20.1\ K$ b) (No specific $\Delta T$ given in the problem for calculating $Q$ for diatomic gas in a non - relative way. If we assume the same $\Delta T$ as in pa…
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the process in which an atom becomes an ion is called
Ionization
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which of the following are properties of ions? a reactive b attracted o…
d. All of the above
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ch. 6 - how atoms bond quiz started: oct 13 at 9:59pm quiz instructions…
2
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ch. 6 - how atoms bond quiz started: oct 13 at 9:59pm quiz instructions…
C. Boron does not obey the octet rule.
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question 7 1 pts in order to become stable, an atom of aluminum (al) wi…
lose
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match the following atoms with its number of valence electrons. potassi…
potassium - 1 carbon - 4 magnesium - 2 oxygen - 6
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question 5 1 pts i can determine the number of valence electrons in an …
looking at their group/family number.
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question 4 which of the following elements does not form an ion with a …
C. fluorine
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ch. 6 - how atoms bond quiz started: oct 13 at 9:59pm quiz instructions…
only anions
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question 2 what happens when an element of group 2 interacts with an el…
The element from group 16 will gain two electrons from the group 2 element.
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ch. 6 - how atoms bond quiz started: oct 13 at 9:59pm quiz instructions…
NaF, FeCl3
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check your theoretical yield mass. check your yield calculation. did yo…
Theoretical yield: 4.27 g Percent yield: 78.0%
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8. an engine is 35% efficient. if it takes in 7,000 j of chemical energ…
$2450\ J$
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a) consider gas container of volume v, (3.0 l, 1.0 ml = 1 cm³) at atmos…
a) The new pressure $P_2\approx0.632P_1$. b) The ratio of the mean - free time $\frac{\tau_1}{\tau_2}\approx1.37$.
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lab data triglyceride molecular formula $c_{51}h_{98}o_{6}$ triglycerid…
4.26
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mean free path and mean free time of gas molecule n = # atoms v = vol. …
The mean - free path of a gas molecule is $\lambda=\frac{k_{B}T}{4\pi r^{2}P}$ and the mean - free time $\tau=\frac{\lambda}{\bar{u}}=\frac{k_{B}T}{4\pi r^{2}P\bar{u}}$, where $k_…
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lab data triglyceride molecular formula: $c_{51}h_{98}o_{6}$ triglyceri…
3.33
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average kinetic energy and rms speed of gas molecule consider a gas con…
The r - ms speed of the gas molecule at $55^{\circ}C$ is $u_{rms1}\sqrt{\frac{328}{298}}$ times the r - ms speed at $25^{\circ}C$, where $u_{rms1}$ is the r - ms speed at $25^{\ci…
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organize it! tell which statements are true and which are false by movi…
1. "Opposite poles of magnets attract, and similar poles repel each other." - TRUE 2. "Increasing the number of coils in an electromagnet will increase the power of the magnet." -…
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complete the text with the better conjunctive adverb. when electronic w…
Therefore
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explore it! part 3 electromagnets run on electricity, and they are only…
4. Electrical energy, magnetic energy. 5. Electrical energy is transformed into magnetic energy. 6. Increase the current (use a stronger battery), increase the number of wire - tu…
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finding half - life and rate constant from a graph of concentration ver…
$t_{1/2}=60\ s$ $k = 0.012\ s^{-1}$ $[N_2O_5]=5.6\times10^{-7}\ M$
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kinetics and equilibrium finding half - life and rate constant from a g…
(1) To find $t_{1/2}$, assume the initial concentration of $N_2O_5$ is $[N_2O_5]_0$. From the graph, when the concentration is $\frac{[N_2O_5]_0}{2}$, the time $t_{1/2}$ is read o…
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atomic models worksheet use your notes and the internet to help you fil…
| Year | Scientist | Contribution | Diagram | |--|--|--|--| | 1897 | J. J. Thomson | Discovered the electron, proposed plum - pudding model (electrons in a positively charged sphe…
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what is the purpose of a ph meter? a it measures the length of an objec…
B. It measures the acidity of a liquid.
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29 a ______ is any chemical you take that affects the way your body wor…
29. C. Drug 30. B. False 31. B. False 32. C. brain's 33. B. False
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15 acid diethylamide, lsd, lsd - 25, or acid, is a semisynthetic psyche…
15. Lysergic 16. faculties 17. False 18. Cocaine
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question 1 (mandatory) (10 points) listen during examination of your pa…
exposure of the right eye to a chemical irritant
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which of the following best illustrates the concept of unequal exchange…
B. A Global South country exporting low - value raw materials while importing high - value manufactured goods
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which of the following best illustrates the concept of unequal exchange…
B. A Global South country exporting low - value raw materials while importing high - value manufactured goods
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which of the following best illustrates the concept of \unequal exchang…
B. A Global South country exporting low - value raw materials while importing high - value manufactured goods
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read the passage about three more slow processes of the carbon cycle: f…
Oxygen: Reactant Carbon - based fuel: Reactant Carbon dioxide: Product Water vapor: Product
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read the poem. skimming the bottom in the company of toes, i observe th…
C. abcb
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the carbon cycle is a model that describes how carbon moves between ear…
1. The shells of dead marine organisms sink to the ocean floor and mix with sediment, forming carbon - rich rock over time. 2. Carbon dioxide gas in the air reacts with water to f…
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determine whether each statement is true or false. if the oceans absorb…
1. True 2. False 3. True 4. True
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31. the most common cause of skin cancer is a. smoking b. exposure to c…
31. C. exposure to UV radiation 32. D. asymmetrical, border, color, diameter, evolve 33. B. third
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fill in the isotope names and any missing information, including isotop…
| | Mn - 42 | Mn - 40 | Ge - 62 | Ge - 64 | Pd - 97 | Cs - 168 | Cs - 166 | Fe - 53 | Fe - 56 | I - 85 | I - 88 | Ge - 65 | Ge - 68 | Incorrect | Incorrect | Incorrect | Incorrect…
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name: ______________ period: ____ date: ______________ isotope practice…
1. Isotopes are atoms of the same element with different numbers of neutrons in the atomic nucleus. 2. The number next to an isotope is the mass number, which is the sum of proton…
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staab (2020) emphasizes that social protection for women informal worke…
C. Gendered care responsibilities and exclusion from contributory schemes undermine access to protections
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staab (2020) emphasizes that social protection for women informal worke…
C. Gendered care responsibilities and exclusion from contributory schemes undermine access to protections
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staab (2020) emphasizes that social protection for women informal worke…
C. Gendered care responsibilities and exclusion from contributory schemes undermine access to protections
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staab (2020) emphasizes that social protection for women informal worke…
C. Gendered care responsibilities and exclusion from contributory schemes undermine access to protections
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name: name redacted health career exploration period: period redacted d…
## A. Fill in the Blanks 1. body 2. drawings 3. (Andreas Vesalius - not given in options but relevant historically) 4. chemicals 5. medicine ## C. True or False 1. False 2. False …
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b. matching match the name to what they did. | a | b | |----|----| | 1.…
1. a 2. b 3. c 4. d 5. e
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40. a rectangular tank measuring 27.0 cm x 7.0 cm x 11.25 cm contains a…
$42.525\ g$