化学
化学反应、化学计量、分子结构与元素性质。
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17. list the vocabulary word for the following a. hex = systematic nami…
a. Hex - b. Ether c. Atomic number d. Oct - e. Constitutional isomers f. Ketone g. Lewis acid h. Isotope i. Nonadec - j. Acid dissociation constant ($K_a$) k. Pent - l. Nomenclatu…
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for each problem below, write the equation and show your work. always u…
1. $10132.5\ g$ 2. $11\ g/cm^{3}$ 3. $186567.2\ mL$ 4. $22\ mL$ 5. $118.4\ g$ 6A. $25.8\ mL$ 6B. $16.4\ mL$ 6C. $24\ mL$
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look at the molecule shown below. what can you tell me about this molec…
1. The molecule is a disaccharide. 2. An enzyme can break a glycosidic linkage via a hydrolysis reaction.
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in the given three - dimensional molecular structure, the differently c…
$C_7H_7NO_2$
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there are two naturally occurring isotopes of boron. $^{10}$b has a mas…
$^{10}\text{B}$ abundance: 20% $^{11}\text{B}$ abundance: 80%
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on another planet, the isotopes of titanium have the given natural abun…
$46.905$
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question 20 which of the following is incorrect? fda attempted to prohi…
C. Composting is not allowed in organic foods.
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multiple choice question the chemical name for the four forms of vitami…
O tocopherols.
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on another planet, the isotopes of titanium have the given natural abun…
$46.90$
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an atom or ion has 41 neutrons, 36 protons, and 36 electrons. identify …
element symbol: Kr mass number: 77 charge: 0
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question 15 which of the following is incorrect? organic foods cannot b…
Organic foods cannot be treated with natural pesticides.
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question 14 2 pts the potential risk from either organic or locally gro…
False
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15. how many electrons are found in the s - sublevel? 1s²2s²2p⁶3s²3p⁶4s…
15. d. 8 16. c. d
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identify the missing information for each atom or ion. note that the at…
number of neutrons: 44 number of protons: 34 number of electrons: 36 element symbol: Cu number of protons: 29 number of electrons: 28
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select all the true statements. the cl⁻ and br⁻ ions have the same numb…
The K⁺ ion is formed when a potassium atom loses one electron. The Fe²⁺ and Fe³⁺ ions have the same number of protons.
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word problems 1. a block of aluminum occupies a volume of 15.0ml and we…
1. $2.7g/mL$ 2. $13.6g/mL$ 3. $157.8g$ 4. $\approx8.92g/cm^{3}$ 5. $\approx238.1cm^{3}$ 6. $219.125g$ 7. $\approx11.3g/cm^{3}$ 8. $\approx7.92g/mL$
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3. in the following chemical equation - label the reactants and product…
3. Reactants: $CH_4, 2O_2$; Products: $CO_2, 2H_2O$ 4. $CH_4$: 1 molecule; $O_2$: 2 molecules; $CO_2$: 1 molecule; $H_2O$: 2 molecules 5. Conservation of matter is shown as the nu…
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c.) bromine symbol: total # of electrons: (hint: in a neutral atom elec…
C. Bromine: Symbol: Br Total # of Electrons: 35 Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵ D. Nickel: Symbol: Ni Total # of Electrons: 28 Electron Configuration: 1s²2s²2p⁶3…
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conservation of mass what information is given in a chemical equation? …
The chemical equation provides information about the identities of reactants and products, the mole - ratios of reactants and products (from coefficients), the number of atoms of …
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conservation of mass what information is given in a chemical equation? …
The chemical formulas of the reactants and products.
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claim - evidence - reasoning phase change as a physical change a substa…
**Revise the Claim**: A phase change is a physical change as the chemical identity of the substance remains constant throughout the change in its state. **Reassess the Evidence**:…
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which of the following statements is/are true: statement 1: when the st…
Statements 1 & 3
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grade/element: date: dr. jassal questions 26 - 35: label each of the fo…
26. M 27. C 28. D 29. F 30. S 31. E 32. S 33. E 34. S 35. C 36. C. pressure
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question 6 of 10 < points possible: 1.00 a student is trying to measure…
More than one of the above answers is correct
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name: date: questions 17 - 25: identify each particle diagram as solid …
17. S 18. G 19. L 20. L 21. G 22. S 23. G 24. S 25. L
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what does it mean to prime a mohr pipet? select one: to submerge the ti…
When one or two samples of the solution that is to be measured are drawn into the tip using a pipet pump
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5. which type of change can be more easily reversed: chemical or physic…
### Question 5 Physical changes can be more easily reversed. Example of physical change: melting ice; Example of chemical change: burning wood. ### Question 6 - b. Physical Proper…
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rate the following pieces of glassware from most precise to least preci…
C. Mohr Pipets > Graduated Cylinders > Beakers
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3. when a substance melts or boils, is it a physical or chemical change…
It is a physical change.
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claim - evidence - reasoning phase change as a physical change a substa…
1. Initial claim: A phase change is a physical change. Evidence: Water freezing into ice, water boiling into steam. Reasoning: Physical change is a change in form/state without al…
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9 sebastian tells his longtime friend joe that he found an easy get - r…
A. That Joe's standards or moral values of what is right and wrong would keep him from getting involved
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claim - evidence - reasoning phase change as a physical change a substa…
1. **Claim**: A phase change is a physical change. 2. **Evidence**: When dry ice (solid CO₂) sublimates directly into a gas; When mercury melts from a solid to a liquid. 3. **Reas…
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6. find the following elements on your periodic table. record what ener…
6a. 3 6b. 5 6c. 6 6d. 4 7. c. 2 8. d. 32 9. b. 1p 10A. Symbol: \(Na\); Total # of Electrons: 11; Electron Configuration: \(1s^{2}2s^{2}2p^{6}3s^{1}\) 10B. Symbol: \(P\); Total # o…
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3. when a substance melts or boils, is it a physical or chemical change…
3. Physical change 4a. Chemical change 4b. Chemical change 4c. Physical change 4d. Physical change 4e. Chemical change 4f. Physical change 4g. Physical change 5. Physical changes …
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4. use what you have learned about chemical and physical changes to ide…
a. Chemical change b. Chemical change c. Physical change d. Physical change e. Chemical change f. Physical change g. Physical change 5. Physical change can be more easily reversed…
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points possible: 1.00 select the true statement: a buret... select one …
A. measures how much titrant has been dispensed when you read the meniscus correctly
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name______ date______ period:______ electrons configurations ws 1. in t…
2. a. s = 1, p = 0, d = 0, f = 0, total = 1 b. s = 1, p = 3, d = 0, f = 0, total = 4 c. s = 1, p = 3, d = 5, f = 0, total = 9 d. s = 1, p = 3, d = 5, f = 7, total = 16 3. e. 2 f. …
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a student is trying to measure 3.00 ml of water with a mohr pipet. they…
2.992 mL
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determine which of the following statements are true? statement 1: prim…
Only statement 1 is true
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8. complete the table | particle | location of particle | charge on par…
8. See completed table above. 9. Protons; Atomic number 10. Element 11. Protons; Neutrons 12. See completed table above.
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2. below is a representation of the solvation process (e.g., water diss…
It is a physical change. The chemical identities of the solute and solvent remain unchanged during the dissolution process, and no new substances are formed.
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snowball had made a close study of some back numbers of the “farmer and…
B. Napoleon does not listen to Snowball's ideas. D. Napoleon says that the improvements will never happen. E. Napoleon seems to be waiting for Snowball's plans to fail.
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unit 1 a: matter: the atom homework 1. matter is defined as: 2. who 1st…
1. Anything that has mass and takes up space. 2. Democritus. 3. a) Mass b) Volume 4. i. Solids ii. Liquids iii. Gases 5. i. Protons ii. Neutrons iii. Electrons 6. (Answer depends …
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6. explain this sentence in your own words: \i cant think but it must h…
The speaker is convinced that the others had a pre - planned conspiracy, as they find it hard to believe that the others could have attacked the King's troops so promptly and amas…
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4. write the balanced equation for the double displacement reaction tha…
The balanced equation is $2Na_3PO_4 + 3MgCl_2=6NaCl+Mg_3(PO_4)_2$. The mass of $NaCl$ is $12.27\ g$ and the mass of $Mg_3(PO_4)_2$ is $9.20\ g$.
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practice: 3. determine how many grams of hydrogen are needed to produce…
$5.055\ g$
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1.5 bell ringer: proof of earth’s formation and layers 1. what is the p…
1. S - waves cannot pass through it. 2. Asthenosphere. 3. Information about Earth's early chemical composition. 4. Sedimentary rock and fossil evidence. 5. The asthenosphere is se…
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select the correct answer. which energy source is formed when organic m…
B. coal
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3) look at boron. it has two possible isotopes. based on the average at…
The $^{11}B$ isotope is most abundant in nature because the average atomic mass of boron (10.81) is closer to the mass - number of $^{11}B$ (11) than to the mass - number of $^{10…
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read the following attention getter from a former student: have you eve…
Ask a question(s)
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chapters 1 - 2 - 3 and 4 decreased temperature increased temperature ab…
Rate of Reaction DECREASES (1/2): Decreased temperature, Absence of enzymes, Decreased concentration of reactants Rate of Reaction INCREASES (2/2): Increased temperature, Presence…
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determine the quantity of atoms of vanadium in 1.28 grams of vanadium
$1.52\times 10^{22}$ atoms
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practice: scientific method read each scenario and answer the questions…
1. Independent variable: Presence of bread in the container 2. Dependent variable: Moistness of brownies 3. Hypothesis: If a piece of bread is placed in the brownie container, the…
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determine the quantity of moles of propylene (c₃h₆) in 25.0 g of the su…
$0.594$
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2.1 the nature of matter 1. the basic unit of matter is the 2. what is …
1. Atom 2. Nucleus 3. Protons and neutrons 4. Electrons 5. Carbon, Hydrogen, Sodium 6. Oxygen, Nitrogen, Sulfur 7. Neutrons 8. Unstable nucleus 9. A substance formed when two or m…
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17. anna places an alka - seltzer tablet into a cup of hot water and an…
The cup with hot water will finish the reaction first because the rate of a chemical reaction increases with an increase in temperature.
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q.3. fill in the blanks using the following word bank. compound homogen…
b
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2. water is essential for life due to its unusual bent polar structure.…
a. Ionic compounds dissolve easily in water.
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part a can you recognize the chemical and physical changes that happen …
1. P 2. C 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P
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identify the following as physical (p) or chemical (c) changes. 1. nacl…
1. P 2. C 3. P 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. C 12. C 13. C 14. P 15. C 16. P
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identify the following as a chemical (c) or physical property (p): 1. b…
1. P (blue color is a physical property) 2. P (density is a physical property) 3. P (flammability is a chemical property) 4. P (solubility is a physical property) 5. C (reacting w…
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part a can you recognize the chemical and physical changes that happen …
Part A: 1. P 2. C 3. P 4. P 5. C 6. C 7. P 8. P Part B: 1. P 2. P 3. C 4. P 5. C 6. C 7. P 8. P 9. C 10. P 11. P 12. P 13. P 14. C 15. C 16. P 17. P 18. C 19. C 20. C 21. P 22. C
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20) all of the following statements about different elements are true e…
20) B, C 21) B 22) D 23) D 24) B 25) A 26) A
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161 minutes remaining test content page 24 of 25 question 24 which of t…
C. steel
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13) which of the following statements about the nature of electrical ch…
13. E. All of the above statements are true. 14. E. none of the above 15. B. left side 16. B. halogens 17. A. alkaline earth metals 18. A. noble gases 19. C. a cation
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page 23 of 25 question 23 in a neutral atom the number of ______ is equ…
B. protons; electrons
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test content page 22 of 25 question 22 which of the following is a phys…
B. Shattering a glass bottle of hydrochloric acid, HCl
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read the passage. how do architects use math to ensure that their build…
The question encourages the reader to challenge preconceptions they might have about math being irrelevant to standards of beauty.
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15g 45 g→60 g 5.) n₂ + 3h₂→2nh₃ □ g 6 g→62 g
$56$
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3.) h₂o + so₃ → h₂so₄ 15g blankg → 60 g 7.) na₂ + h₂so₄ → na₂so₄ + h₂ 2…
3.) $45$ 7.) $21$ 9.) $35$
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true/false. write t if the statement is true and f if the statement is …
1. T 2. F 3. F 4. F 5. T 6. T 7. T 8. F 9. T 10. F 11. C. Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus. 12. B. Most all o…
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5. 2al + 2hcl → 3h₂ + 2alcl₃ al = 2 h = 2 cl = 2 al = 2 h = 6 cl = 6 ye…
7. Sn: 2, H: 8, O: 4; Sn: 2, H: 6, O: 3; No 9. N: 2, H: 6, O: 4; N: 1, H: 2, O: 2; No
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test content page 19 of 25 question 19 valence electrons are the electr…
B. False
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select all the sentences that use the word inherent correctly. after a …
C. The inherent value of a summer job is that it teaches you about the importance of hard work and responsibility. D. Despite the project's inherent challenges, she remained optim…
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test content page 18 of 25 question 18 generally, ______________ elemen…
B. noble gas
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167 minutes remaining test content page 17 of 25 question 17 which elem…
A. F, Br, I
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instructions: count the atoms on the reactant side of the equation and …
1. $H = 6$, $O = 2$ (reactants); $H = 4$, $O = 2$ (products); No 3. $N = 2$, $H = 6$ (reactants); $N = 2$, $H = 6$ (products); Yes 5. $Al = 2$, $H = 2$, $Cl = 2$ (reactants); $Al …
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question 15 the number of valence electrons in an element with electron…
C. 6
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head socks are designed to prevent which type of materials from damagin…
Dust and refinish material particles
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question 14 what is the difference between co and co? a nothing; co and…
B. CO is carbon monoxide, a compound containing carbon and oxygen. Co is an element
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question 13 where is most of the mass of an atom concentrated? a nucleu…
A. nucleus
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determine the mass, in grams, that are in 5.32×10²² molecules of co₂?
$3.89$ g
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quiz a qualitative fit test is a subjective, or opinion - based test th…
A. True
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study the following phase diagram of substance x. use this diagram to a…
Solid; Sublime; No phase change
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type the element in each list with the largest atomic radius: na, al, m…
Na Rb Ba Fr
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almost! the wrong number of words are capitalized, so try undoing one o…
After the final exam, Maui's teacher hosts a Bunsen burner hot dog roast for all chemistry students.
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read each description in the first - column of the table below. if any …
| Description | Does any element match? | If yes, give symbol | | ---- | ---- | ---- | | An element in Period 6 and Group 7A | Yes | At | | A semimetal in Group 5A | Yes | As | | …
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fill in the missing information: symbol atom or ion? check all that app…
| symbol | atom or ion? check all that apply | number of protons | number of electrons | | ---- | ---- | ---- | ---- | | $O^{2 -}$ | anion | 8 | 10 | | Cu | neutral atom | 29 | 29…
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | Mg²⁺ | PO₄³⁻ | Mg₃(PO₄)₂ | magnesium phosphate | | Pb⁴⁺ | BrO⁻ | Pb(BrO)₄ | lead(IV) hypo…
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lets focus on logos logos is an appeal to logic. it is a means of convi…
**: Ineffective use of logos. 2. **Explanation**: This is an ineffective use of logos. The premise that everyone has children is false, so the argument based on it is not logical.
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logos is an appeal to logic; it is a means of convincing the audience t…
1. Effective? Yes. Explanation: Valid logical syllogism. 2. Effective? No. Explanation: False premise. 3. Effective? Yes. Explanation: Logical analogy. 4. Effective? Yes. Explanat…
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when comparing convenience diet food to organic foods, we can conclude …
B. that convenience food has more additives
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simple binary ionic compounds please complete the following table: | na…
| Name of Ionic Compound | Formula of Ionic Compound | |--|--| | 1. Sodium bromide | $NaBr$ | | 2. Calcium chloride | $CaCl_2$ | | 3. Magnesium sulfide | $MgS$ | | 4. Aluminum oxi…
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1. (a) (i) what are exotic breeds? (ii) state three advantages of exoti…
(i) The molar mass of $Na_2CO_3$ is $106g/mol$. (ii) The molar mass of $CH_3COOH$ is $60g/mol$.
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a local reaction is when a chemical enters the bloodstream. true false …
B. False
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choose the correct answer. which is a pure substance?
Salt
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choose the correct answer. when fireworks explode, what is happening to…
B. A chemical change
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choose the correct answer. which of the following is considered a physi…
cutting wood into pieces to build a doghouse
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a) the speed of individual molecules b) the mass of the liquid c) the a…
c) Macroscopic property
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choose the correct answer. which element shares similar properties to c…
C. Flourine (F)