化学
化学反应、化学计量、分子结构与元素性质。
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6) which of the following is an example of potential energy? (1pts) car…
snow boarder at the top of hill
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5) which of the following is a chemical change? (1pts) water evaporates…
□ a penny tarnishes
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4) of the properties listed below for the metal magnesium, which would …
☑ ignites when heated
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3) an example of a physical property is: (1pts) tnt is explosive gasoli…
none of these choices
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2) which is an example of a physical change? (1pts) □ steam from the bo…
Steam from the boiling water condenses on the cooler part of the ceiling.
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for the substituted cyclohexane compound shown, identify the atoms that…
E (CH₃), C (F), F (H), K (Cl), J (H)
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graded assignment you will fill in your assignment sheet that aligns wi…
4. element 5. atoms 6. sharing 7. transferring (or transferring/transfer of)
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• assume that all fruit juice solutions are 100% concentrated at the be…
If we assume total volume is 100 mL (approximate), the percent strength of Juice A is $25\%$. If we use the given volumes, it's approximately $25.51\%$. (The answer depends on the…
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1. objective use the phet simulation to _______ (1) different molecules…
1. (1): **build** 2. (2): **bond together** 3. (3): **formulas**
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what is the iupac name for the compound? iupac name:
2-methyl-1-butanol
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what is the iupac name for the compound? iupac name:
2-methyl-1-butanol
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a client who is receiving chemotherapy is prescribed ondansetron. which…
A. Headache
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click and drag on elements in order rank the steps used to solve mole -…
1. Balance the chemical equation and interpret the equation in terms of moles. 2. Convert the amount of the given substance from grams to moles, if grams are given. Use the invers…
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multiple choice question during the reaction shown below, 5.0 moles of …
D. Balance the chemical equation and interpret the equation in terms of moles.
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click and drag on elements in order during a reaction, 3.5 g of carbon …
1. \(2\text{CO}(g) + \text{O}_2(g) ightarrow 2\text{CO}_2(g)\) 2. \(3.5\ \text{g CO} \times \frac{1\ \text{mol CO}}{28.01\ \text{g CO}} = 0.1250\ \text{mol CO}\) 3. \(0.1250\ \tex…
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what is the molarity of a solution in which 5.6 moles of sodium nitrate…
$1.1\ \frac{\text{mol}}{\text{L}}$
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a solid is brittle and has entirely bonded atoms, as seen in the partic…
network
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what is the dominant intermolecular force found between formaldehyde mo…
dipole-dipole forces
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consider the reaction for the combustion of acetylene.\\(2\\ce{c_{2}h_{…
$26.4$ L $\text{C}_2\text{H}_2$
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what is the temperature (in k) of 16.45 moles of methane gas in a 70.7 …
245 K
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how many moles of cl₂ are in a container with a volume of 7.5 l at stp?
Approximately 0.33 moles of $\text{Cl}_2$
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instructions: classify each of the following properties of matter as ph…
21. [P] 22. [P] 23. [C] 24. [C] 25. [P] 26. [C] 27. [P] 28. [P] 29. [P] 30. [P] 31. [P] 32. [P] 33. [C] 34. [P] 35. [P] 36. [C] 37. [P] 38. [P] 39. [C] 40. [C]
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instructions: classify each of the following as an element e, a compoun…
11. [E] Gold 12. [C] Water 13. [M] Seawater 14. [C] Sugar 15. [M] A chocolate sundae 16. [M] Air 17. [C] Carbon dioxide 18. [E] Silver 19. [C] Ice 20. [M] A Big Mac®
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instructions: write e in the blank if the material is heterogeneous or …
1. E 2. O 3. O 4. E 5. O 6. E 7. E 8. O 9. O 10. O
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how many covalent bonds is nitrogen (group 5a) likely to form? (1 point…
three
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which type of bond and how many bonds would occur as carbon dioxide (co…
four covalent bonds
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which kind of bond would occur between sodium (na, group ia) and chlori…
ionic
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between which types of elements do ionic bonds occur, and how do electr…
metals and nonmetals, electrons transferred
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use the list to answer the question. - potassium, group ia - calcium, g…
potassium and iodine
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fluorine has 7 valence electrons. which charge is its ion likely to hav…
1-
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which information about an atom can a period number give you? (1 point)…
how many energy levels it has
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when moving across a period from left to right in the periodic table (e…
Valence electrons increase by one
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5. which of the following excerpts best illustrates how napoleon justif…
### Question 5: D. "Suppose you had decided to follow Snowball, with his moonshine of windmills — Snowball, who, as we now know, was no better than a criminal?" (55) ### Question …
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in all areas of the world, groundwater is an important source of drinki…
D. use of organic fertilizers (manure) in farming
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a student measures the molar solubility of silver carbonate in a water …
$8.59 \times 10^{-12}$
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a student measures the oh⁻ concentration in a saturated aqueous solutio…
$2.13 \times 10^{-8}$ (rounded to three significant figures)
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for each of the following names, write the appropriate formula for it. …
$N_2O_3$ ### 2) nitrous acid
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use the references to access important values if needed for this questi…
9.55
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use the references to access important values if needed for this questi…
$0.0172$ M
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for each of the following formula, name it appropriately. (spelling doe…
Chloric acid ### 2) $\boldsymbol{\ce{P_2O_5}}$
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application: use the appropriate rules to write the following names and…
### Problem 1 #### Part a # Explanation: ## Step1: Identify elements and prefixes Sulfur (S) has no prefix (mono), hexabromide means 6 bromine (Br) atoms. ## Step2: Write formula …
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solution a = 10⁻³ m and solution b = 10⁻⁵ m solution a = 12.23% (w/v) a…
## Solution A Is More Concentrated Than B: - Solution A = $10^{-3}$ M and Solution B = $10^{-5}$ M ## Equal Concentrations: - Solution A = 0% (w/v) and Solution B = 0% (w/v) ## So…
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in the laboratory, a general chemistry student measured the ph of a 0.5…
$6.9 \times 10^{-4}$ (or $6.86 \times 10^{-4}$ for more precision)
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in the laboratory, a general chemistry student measured the ph of a 0.5…
$1.97 \times 10^{-4}$
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click and drag on elements in order correctly order the steps necessary…
To solve this, we follow the logical order for stoichiometric calculations with limiting reactants: ### Step 1: Balance the chemical equation A balanced chemical equation is essen…
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question 10 for a solid to become a gas, energy must be .
absorbed (or added)
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unit test: states of matter started: jan 26 at 9:49am quiz instructions…
it's a measure of the movement of a substance's molecules
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when energy is absorbed, in an endothermic reaction, the container wher…
False
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question 6 what is the term for a reaction where energy is released? fu…
exothermic
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match each molecule with its atomic model. ethane (c₂h₆) methane (ch₄) …
- ethane (\(C_2H_6\)) → last model (two black carbons, six white hydrogens) - methane (\(CH_4\)) → second model (one black carbon, four white hydrogens) - water (\(H_2O\)) → third…
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match the chemical formula with the appropriate model. methane (ch₄) me…
To solve this problem, we analyze the molecular structure of each compound: ### Methane ($\boldsymbol{CH_4}$) Methane has 1 carbon atom bonded to 4 hydrogen atoms. The second mode…
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question 2 when a solid is melting, the temperature will not rise until…
True
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multiple-choice question rhythm is the ______ in poetry. □ rhyme scheme…
D. beat (assuming the last option is labeled D, with text "beat")
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question 7 (10 points) listen water is a liquid at room temperature. th…
hydrogen bonding between water molecules.
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question 5 (10 points) listen which of the following statements correct…
polar covalent bonds because oxygen is more electronegative than hydrogen
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ch₄n₂o which structure could be used to represent urea? a image b image…
C. The structure with one gray (C), two blue (N), one red (O), and four white (H) atoms.
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question 3 (10 points) atoms that gain or lose electrons are known as: …
ions
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buffers are strong acids or bases. keep the ph within normal limits. lo…
keep the pH within normal limits.
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the chemical formula for methanol is ch₃oh. which of the following mode…
D
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match the chemical formula with the appropriate model. methane (ch₄) me…
To solve this, we analyze each compound's structure: 1. **Methane (CH₄)**: Has 1 C and 4 H. The model with 1 black (C) and 4 gray (H) atoms (second model) matches. 2. **Methanol (…
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this is an ethanol molecule. the formula for ethane is $c_2h_6o$. your …
Red balls: 6, Dark gray balls: 6, Light gray balls: 12 Wait, no, wait—ethanol's dark gray is 2 C, so glucose has 6 C, so 6/2 = 3 times ethanol's C. So dark gray balls: 2 * 3 = 6? …
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your teacher wants you to make a model for butanol (c₄h₁₀o). what suppl…
- Dark gray (C): 4 - Light gray (H): 10 - Red (O): 1 So matching: Dark gray (C) → 4 Light gray (H) → 10 Red (O) → 1
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the chemical formula for methanol is \\ce{ch_{3}oh}. which of the follo…
A. [The model with 1 gray (C), 4 white (H), 1 red (O) atoms arranged as C bonded to 3 H, 1 OH group]
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listed below are 4 negatively charged ions (nonmetals). write the formu…
## A) Li 1. $\text{Li}_2\text{S}$ 2. $\text{Li}_3\text{P}$ 3. $\text{LiI}$ 4. $\text{Li}_3\text{N}$ ## B) Pb (using +2 charge, common for such compounds) 1. $\text{PbS}$ 2. $\text…
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ethanol has the chemical formula, c₂h₆o. the atomic model is shown. dra…
- Larger gray atoms: carbon - Smaller gray atoms: hydrogen - Red atom: oxygen (Perform the drag - and - drop action: drag "carbon" to the larger gray atoms, "hydrogen" to the smal…
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b. fill in the blanks 1. the atomic number tells the number of ______. …
protons (or protons and electrons for a neutral atom) ### 2.
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Question was provided via image upload.
1. $\boldsymbol{HgBr_2}$; Electron dot diagram: $\text{Hg}^{\bullet\bullet} ightarrow \overset{\Large \bullet\bullet}{\underset{\Large \bullet\bullet}{\text{Br}:}}$, $\text{Hg}^{\…
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name _______________ period ______ date ______ 1) when bonding with non…
1) give; positively; ions 2) take; negatively | Metal Ion | Valence Electrons | Charge of Ion | Oxidation number | Nonmetal Ion | Valence Electrons | Charge of Ion | Oxidation num…
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chemical formulas name _______________ period ______date ______ 1) when…
When bonding with nonmetals, metal atoms tend to \(\boldsymbol{\text{give}}\) their valence electrons and make \(\boldsymbol{\text{positively}}\) charged atoms called \(\boldsymbo…
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oxidation numbers name __________ hour __ | element | metal or nonmetal…
To solve for each element, we analyze their properties (metal/nonmetal, valence electrons, electron gain/loss, oxidation number) using periodic table trends: ### 1. Selenium (Se) …
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complete ionic equation a. substances produced as the result of a chemi…
d. equations that shows dissolved ionic compounds as dissociated free ions (Note: Assuming the options are labeled a, b, c, d with the fourth option being d; if the original label…
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module 0: intro. to chemistry and measurement 8. how many significant d…
5 ---
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a chemical equation that does not indicate the relative amounts of the …
True
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a negatively charged ion; has gained an electron → anion true false
True
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the formulas of the reactants are connected by an arrow with the formul…
True
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a substance that speeds up a reaction but is not used up in the reactio…
A. catalyst
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chemical reaction in which an element or compound reacts with oxygen, o…
D. combustion reaction
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mall whole numbers placed in front of the formulas in the equation in o…
D. coefficients (assuming the options are labeled with letters, and "coefficients" is the correct one. If the original options had different labels, adjust accordingly, but based …
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a single compound breaks down into two or more simpler products; ab = a…
D. decomposition reaction
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1. equations for a reaction in solution that shows only those particles…
B. net ionic equation
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the chemical formula for methanol is $ce{ch_{3}oh}$. which of the follo…
D. The model with 1 carbon (gray), 3 hydrogens (white) on carbon, 1 oxygen (red) with 1 hydrogen (white) on oxygen.
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match the chemical formula with the appropriate model. methane (ch₄) me…
each compound's structure: ### Methane (\( \text{CH}_4 \)) - Has 1 carbon (black) and 4 hydrogens (white). - Matches the model with 1 black sphere (C) and 4 white spheres (H). ###…
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read this excerpt from walt whitmans poem \i hear america singing\ from…
A. present a poem with a natural, conversational rhythm.
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density practice $\\boldsymbol{d = \\frac{mass}{volume}}$ solve the fol…
1. $3.52\ \text{g/mL}$ 2. $44.5\ \text{g}$ 3. $25.5\ \text{mL}$ 4. $2.7\ \text{g/cm}^3$ 5. $8.96\ \text{g/mL}$ 6. $7.87\ \text{g/mL}$ 7. $1.5\ \text{g/mL}$
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scenario analysis: water pollution & freshwater protection directions: …
B. Farming wastes #### Question 2
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builder (practice) poisonous (adjective) poi·son·ous ˈpȯi-zᵊn-əs potent…
### Synonym(s) toxic, harmful, destructive ### Antonym(s) healthy, vital, helpful
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produce (verb) pro·duce prə-ˈdüs to make \both are very poisonous, but …
### Synonym(s) create, form ### Antonym(s) destroy, break
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react (verb) react rē-akt \iron in the metal reacts with oxygen in the …
D. to chemically interact or combine
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match the chemical formula with the appropriate model. methane (ch₄) me…
1. methane (CH₄) → Second model (black central atom with 4 gray atoms) 2. methanol (CH₃OH) → Fourth model (gray central atom, red atom, 4 small light gray atoms) 3. ethane (C₂H₆) …
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this is an ethanol molecule. the formula for ethane is $\\ce{c_{2}h_{6}…
6 red balls, 6 dark gray balls, and 12 light gray balls
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match each molecule with its atomic model. ethane (c₂h₆) methane (ch₄) …
1. ethane (C₂H₆) → 4th model (two black carbons, six white hydrogens) 2. methane (CH₄) → 2nd model (one black carbon, four white hydrogens) 3. water (H₂O) → 3rd model (one red oxy…
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your teacher wants you to make a model for butanol (c₄h₁₀o). what suppl…
Dark gray (carbon): 4 Light gray (hydrogen): 10 Red (oxygen): 1
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ethanol has the chemical formula, c₂h₆o. the atomic model is shown. dra…
1. Top-left dashed box: hydrogen 2. Middle dashed box: carbon 3. Bottom dashed box: oxygen
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| name | cation with charge | anion with charge | formula | | ---- | --…
To solve for the chemical formulas, we use the principle of charge balance: the total positive charge from cations equals the total negative charge from anions. Let's take "Vaseri…
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question 2 1 pts which is an example of demographic segmentation? selli…
B. Advertising a video game to teenagers
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the average kinetic energy of the molecules that make up sample f is 2 …
3
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lighting a match is an example of an __ process. endothermic exothermic…
B. exothermic
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in an exothermic process heat is absorbed (taken in) released rewatch
B. released (assuming the second option is labeled B, if the first was A. absorbed (taken in), B. released)
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worksheet: periodic table trends (5) name for each of the following, ci…
1. Metal: Li 2. Forms -3 anion: N 3. Largest atomic mass: Sr 4. Member of halogen family: Cl 5. Liquid at room temperature: Hg 6. Forms +2 cation: *No valid option in given set (P…
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worksheet: periodic table trends (s - 2) name for each of the following…
1. $\boldsymbol{Li}$ (member of alkali metals) 2. $\boldsymbol{S}$ (nonmetal) 3. $\boldsymbol{K}$ (member of alkali metals) 4. $\boldsymbol{Br}$ (member of the halogen family) 5. …