Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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classify each element as a halogen, a noble gas, or neither. drag the a…
Halogen: Br, I Noble gas: Xe, Ne Neither: S
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part a which elements are alkali metals? check all that apply: iron lit…
- lithium - potassium
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missed this? watch kcv: the periodic law and the periodic table; read s…
Mo
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which elements would you expect to gain electrons in chemical changes? …
Would expect to gain electrons: - nitrogen - iodine Wouldn't expect to gain electrons: - tungsten - strontium - gold
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chapter 4 and 9 homework exercise 4.52 - enhanced - with feedback s ca …
Metal: Ca Nonmetal: S, N Metalloid: As, Te
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each element as a metal, nonmetal, or metalloid appropriate items to th…
- Metal: Ca - Nonmetal: N - Metalloid: B, Te, As
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sn express your answer as an integer. z = submit request answer part b …
Part A (Sn): $50$ Part B (Mo): $42$
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learning goal: to understand the relationship between atomic number and…
269
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practice it! which of the following is a potential environmental conseq…
Sediments are unable to reach the end of the river.
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what did you figure out? chemical energy and waves describe in your own…
1. Chemical energy is stored in molecular bonds and released during reactions (e.g., burning fuel or digesting food) to perform work. 2. Transverse waves (e.g., light, water waves…
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practice it! select the statement that does not explain how crude oil a…
Both have biogenic sources.
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5. which of the following was not used to break through trench lines? a…
A. Mounted cavalry charges
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question an element with mass 310 grams decays by 8.9% per minute. how …
$54.2$
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4. based on your knowledge of ionic and covalent bonds, complete the mi…
| Name | Formula | Ionic or Covalent? | |---------------------|-----------|---------------------| | Beryllium bromide | $\text{BeBr}_2$ | Ionic | | Phosphorus trifluoride | $\text…
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which functional group is present in carbohydrates? see figures below. …
D. Hydroxyl (assuming the option for Hydroxyl is labeled as such; if the option identifier for Hydroxyl is, e.g., the fourth option, then the answer would be the option with "Hydr…
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7. a paperclip has a mass of 250 milligrams. how many grams is this? de…
0.25 grams
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in the picture below, which functional group in gray is a sulfhydryl gr…
E
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question 5 0.5 pts the molecules in the picture are ______. molecular s…
D. cis - trans isomers
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the density of a mystery metal is 455 noup/nollag. what is the density …
\( \approx 25.8 \text{ g/mL} \)
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33) an isotope has 15 protons, 16 neutrons, and 15 electrons. which of …
$\boldsymbol{P-31}$
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31) what is the atomic number of barium? (3pts) 56 137 27 13 32) isotop…
31) $\boldsymbol{\square}$ 56 32) $\boldsymbol{\square}$ atomic number.
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30) the element with atomic number 16 is (3pts) iron oxygen sulfur copp…
☑ sulfur
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29) which of the following statements about atomic structure is not acc…
Neutrons are slightly smaller than a proton and neutral in charge.
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27) what is the mass number of an atom that contains 23 protons, 23 ele…
27) D. 51 28) A. 24
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24) which pair of formulas illustrates the law of multiple proportions?…
$\boldsymbol{\text{CH}_4 \text{ and } \text{C}_8\text{H}_{18}}$ For question 25, the full options are not provided, so it cannot be answered. Please provide the complete options f…
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23) the specific heat of iron is 0.473 j/g°c. how much energy is requir…
757 J
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21) the quantity of heat required to raise the temperature of 1.0 gram …
□ specific heat.
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20) which of the following is a chemical change? (3pts) ice melts alcoh…
silver tarnishes
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19) which of the following is a physical change? (3pts) □ kerosene burn…
salt dissolving in water
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18) which of the following compounds would contain 6 atoms of oxygen? (…
$\boldsymbol{\text{Co(NO}_3\text{)}_2}$
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complete the rhyme scheme. a a b b c the great bare tree looked down an…
1. The great bare Tree looked down and smiled. - A 2. "Good-night, dear little leaves," he said; - B 3. And from below each sleepy child - A 4. Replied, "Good-night," and murmured…
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complete the rhyme scheme. two roads diverged in a yellow wood, and sor…
1. Two roads diverged in a yellow wood, → A 2. And sorry I could not travel both → B 3. And be one traveler, long I stood → A 4. And looked down one as far as I could → A 5. To wh…
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3 sara wants to dissolve these sugar cubes in water. list three ways sh…
1. Stir the water while adding the sugar cubes. 2. Use hot (or warm) water to dissolve the sugar cubes. 3. Crush the sugar cubes into smaller pieces (or a powder) before dissolvin…
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student - response activity 1 explain how you would separate a mixture …
To separate a mixture of salt and sand, follow these steps: 1. Add water to the mixture to dissolve the salt (sand is insoluble). 2. Filter the mixture to separate the sand (resid…
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1) choose the correct answer. the story line of fiddler on the roof cam…
1. D. Sholem Aleichem 2. A. Jewish; secular 3. D. watered-down
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7 a bottle of purple ink contains a mixture of red and blue dyes. which…
D. Paper chromatography
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4 what is the best method to test if an unknown sample of liquid is pur…
C. Measure its boiling point ### Question 5
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topic: experimental chemistry (experimental design, methods of purifica…
B. Burette ### Question 2
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the following diagram shows molecular models of glucose (a simple sugar…
C. Some of the carbon atoms in alanine are the same atoms that were once in glucose.
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intensity is a. the lightness or darkness of a color. b. the illuminati…
c. the brightness or dullness of a color.
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the carboxyl functional group is alkaline/basic. true false question 3 …
False ### Question 3
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introduction next week, well start learning about atoms. to whet your i…
### Application 1: Carbon in Batteries (Graphite) - **Description**: Graphite (a carbon allotrope) is a key component in lithium - ion batteries, which are widely used in smartpho…
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what volume of 0.311 m sulfurous acid solution could be neutralized by …
124 mL (rounded to 3 significant figures)
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29.91 ml of an acid solution (identity unknown) is neutralized by 17.29…
$0.2311\ \text{N}$
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25.14 ml of 0.2220 m phosphoric acid is neutralized by 38.77 ml of bari…
$0.2159\ \text{M}$
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what volume of 0.100 m sulfuric acid could be neutralized by 40.00 ml o…
20.00 mL
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7) ___ fe + ___ cuno₃ → ___ fe(no₃)₂ + ___ cu = fe = = cu = = no = 8) _…
1, 2, 1, 2 (coefficients for Fe, \( \text{CuNO}_3 \), \( \text{Fe(NO}_3\text{)}_2 \), Cu) ### Problem 8: Balancing \( \boldsymbol{\text{NaCl} + \text{F}_2 ightarrow \text{NaF} + \…
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what is the mass % of ethylene glycol in a 2.33 m solution of ethylene …
13.5% (rounded to three significant figures)
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what is the concentration in molarity of an aqueous solution that conta…
$0.605\ \text{mol/L}$
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an aqueous solution of glucose (molar mass = 180.2 g/mol) has a molalit…
$3.57\ \text{M}$ (rounded to three significant figures)
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what is the molarity of potassium ions in a 0.122 m k₂cro₄ solution? 0.…
0.244 M $K^+$
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question 7 (1 point) molecular elements contain two or more identical a…
False
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select all that apply: atoms with an unequal number of protons and elec…
A. anions, D. cations ### Question 6
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a solution with a ph of 4 has how many times hydronium (h+) ions as a s…
10 (corresponding to the option "10")
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determine the amount in grams of kcl that exists in 20.3 g of a solutio…
0.231 g KCl For the empty box in the red-framed ratio, the correct label is **g KCl** (to match the unit cancellation logic: $\frac{\text{g KCl}}{\text{g solution}} \times \frac{\…
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describe the location of each of the following groups on the periodic t…
1. **Alkali metals**: Location: Group 1 (excluding H) Elements: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr) 2. **Alkaline Earth Metals**: L…
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describe the location of each of the following groups on the periodic t…
1. **Alkali metals** - Location: Group 1 (far left, excluding hydrogen) - Elements: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr) 2. **Alkali…
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how many moles are present in 45.7 cm³ of chromium (cr), given that the…
$\approx 6.32$ moles --- ### Second Calculation Problem: Moles of Mercury
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6. what sample contains more atoms: 1 mole of nacl or 1 mole of cacl₂? …
6. 1 mole of $\text{CaCl}_2$ 7. 1 mole of silicon atoms 8. $17.03\ \text{g/mol}$ (rounded to two decimal places) 9. $34.02\ \text{g/mol}$ (rounded to two decimal places) 10. 1 mol…
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activity 1 – atoms, molecules, moles, and mass – 10 points purpose to e…
1. 2244 copper atoms 2. $1.13 \times 10^{26}$ copper atoms (rounded to 3 significant figures) 3. $1.54 \times 10^{26}$ water molecules (rounded to 3 significant figures) 4. $3.07 …
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what volume, in l, of a 0.575 m cu₂so₄ solution contains 0.127 lb of cu…
0.449 L
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how many moles of nickel (ni) atoms are in 48.5 g of ni? how many moles…
1. $0.826\ \text{mol}$ 2. $8.21\ \text{mol}$ 3. $1.263\ \text{mol}$ 4. $3.93 \times 10^{23}\ \text{atoms}$ 5. $1.62 \times 10^{21}\ \text{atoms}$ 6. $1.22\ \text{mol}$ 7. $3.15 \t…
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how many equivalents of hydrochloric acid would react with 0.248 eq cal…
0.248 equivalents
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conversions with avogadros number($n_a$) and molar mass how many atoms …
1. Atoms in 2.50 mol Si: $1.51 \times 10^{24}$ atoms 2. Atoms in 2.50 mol Fe: $1.51 \times 10^{24}$ atoms 3. Atoms in 14.8 mol Cu: $8.91 \times 10^{24}$ atoms 4. Moles of Ag: $1.6…
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the atomic masses of $^{35}\text{cl}$ and $^{37}\text{cl}$ are 34.9689 …
Natural abundance of \(^{35}\text{Cl}\) is 75.81%, natural abundance of \(^{37}\text{Cl}\) is 24.19% --- ### Second Problem: Mass of \(^{26}\text{Mg}\)
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identify the reaction that occurs when the base koh is added to the buf…
First box (reactant): \( \text{KOH}(aq) + \text{HF}(aq) \) Second box (product): \( \text{H}_2\text{O}(l) + \text{KF}(aq) \)
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buffer solutions complete the following chemical equations to show what…
First box: \( \text{HBr}(aq) + \text{KF}(aq) \) Second box: \( \text{HF}(aq) + \text{KBr}(aq) \)
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argon (ar) has three naturally occurring isotopes. $^{36}$ar has an ato…
The average atomic mass of argon is 39.948 amu. This matches the periodic table value of ~39.95 amu (the slight difference is due to rounding during calculations). --- ### Second …
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isotopic symbolism \\(\\ce{^{a}_{z}x^{n}}\\) a – mass number z – atomic…
1. **Definition of Isotope**: Atoms of the same element (same atomic number) with different mass numbers due to different neutron counts. 2. **Calcium Isotopes**: - Same: All are …
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unit 2 – atoms and the periodic table – guided notes 2.1 atomic theory …
### Dalton's Atomic Theory 1. Matter is made of indivisible atoms. 2. Same-element atoms are identical. 3. Different elements have unique atoms. 4. Atoms combine in fixed whole-nu…
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unit 2 – atoms and the periodic table – guided notes 2.1 atomic theory …
### Dalton's Atomic Theory 1. All matter consists of indivisible atoms. 2. Same-element atoms are identical. 3. Different elements have unique atoms. 4. Atoms combine in fixed who…
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read the excerpt from \sonnet 29.\ when, in disgrace with fortune and m…
A. abab
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markus is reading a sonnet by william shakespeare. which will best help…
finding a single concept that links the lines together
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solid silver forming on a piece of copper wire the chemical equation fo…
copper (Cu): Reactant copper nitrate ($\text{Cu(NO}_3\text{)}_2$): Product silver (Ag): Product silver nitrate ($\text{AgNO}_3$): Reactant
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antacid tablets for heartburn and indigestion the chemical equation for…
magnesium hydroxide ($\text{Mg(OH)}_2$): solid ($s$) hydrochloric acid ($\text{HCl}$): aqueous ($aq$) water ($\text{H}_2\text{O}$): liquid ($l$) magnesium chloride ($\text{MgCl}_2…
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you might need: periodic table select the correct values in the table. …
single bond: 1 shared electron pair, 2 electrons double bond: 2 shared electron pairs, 4 electrons triple bond: 3 shared electron pairs, 6 electrons
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move the cards to match the name with the correct chemical formula. che…
$\text{CaCO}_3$ - calcium carbonate $\text{K}_2\text{CrO}_4$ - potassium chromate $\text{CaCl}_2$ - calcium chloride $\text{K}_2\text{CO}_3$ - potassium carbonate $\text{KCl}$ - p…
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orange crystals of grossular garnet grossular is composed of calcium io…
$\text{Ca}^{2+}$ and $\text{SiO}_4^{4-}$: Ionic bond $\text{Al}^{3+}$ and $\text{SiO}_4^{4-}$: Ionic bond $\text{Si}$ and $\text{O}$: Covalent bond
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which of the following best describes the term \sciatica\? neurological…
B. Burning or aching posterior thigh pain caused by ischemic changes of and/or neuroinflammation of the Sciatic nerve.
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question 5 (1 point) listen how many atoms are in 7.12 mol of gold, au?…
b) $4.29 \times 10^{24}$ atoms
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question 4 (1 point) listen how many atoms are in 0.534 mol of nickel, …
c) $3.22 \times 10^{23}$ atoms
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question 6 (1 point) listen how many moles are in $8.73 \\times 10^{25}…
d) 145 moles
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question 7 (1 point) listen how many moles are present in 17.4 g of lea…
b) 0.0840 moles
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question 8 (1 point) listen how many moles are present in 50.2 g of mer…
b) $2.50 \times 10^{-1}$ moles
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question 11 (1 point) listen which of the following is an alkali metal?…
a) rubidium (Rb) b) sodium (Na)
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question 3 (1 point) listen three atoms have the following subatomic pa…
- They all have the same atomic number but different atomic masses. - They are all the same element; they are isotopes of each other.
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question 2 (1 point) listen given the following numbers of protons (p),…
b) 14 p, 14 e, 14 n e) 14 p, 14 e, 15 n
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question 1 (1 point) listen which is true of an atom of \\(_{27}^{67}\\…
b) It has the same mass as $_{24}^{67}\text{Cr}$. d) It has 27 protons. e) It has more mass than $_{29}^{65}\text{Cu}$.
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apply: conservation and sustainability google classroom microsoft teams…
A. implementing comprehensive recycling systems B. expanding composting programs for organic waste
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which of the following best describes an example of a provisioning serv…
B. Indigenous communities harvest and eat the bulbs of common camas plants.
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which of the following best describes an example of a supporting servic…
D. Decomposers recycle nutrients through the fundamental process of biogeochemical cycling.
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which of the following best describes an example of a regulating servic…
A. Dense plant growth helps to maintain water quality by removing pollutants.
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this painting is by pablo picasso, entitled the blind man’s meal. what …
b. He used a monochromatic color scheme, which occurs when one color predominates,shades of black, tints of white, values of a hue.
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describe some the similarities and differences between metals, nonmetal…
### Metal (only left circle): - Good conductors of heat/electricity - Lustrous, malleable, ductile - Most are solid at room temp (Hg exception) ### Nonmetals (only right circle): …
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required information a crate has a mass of $10.1 \\times 10^6$ mg (mill…
\(10.1\)
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consider the following electronegativity values: boron (b) = 1.8 carbon…
B-Cl
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sanai was monitoring the oil spill in the gulf of mexico from an oil ta…
Hydrophobic interactions
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a chemist adds a chemical to pure water and there is a 100 - fold incre…
C. 5
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complete the sentences about acids, bases, and ph using the words provi…
1. A(n) **acid** acts to increase the hydrogen ion concentration of a solution. 2. A(n) **base** acts to decrease the hydrogen ion concentration of a solution. 3. A(n) **buffer** …
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label the parts on the diagram. labels hydrogen bond hydrogen atom an o…
- Left top box (linked to the full large molecule): An organic molecule - Right top box (linked to the $\delta^+$ white atom): Hydrogen atom - Right bottom box (linked to the dash…