Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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isotope symbols a (# of protons + # of neutrons) x z (# of protons)
- Box next to A: Mass Number - Box next to X: Chemical Symbol of the Element - Box next to Z: Atomic Number (or Number of Protons)
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9. label: image of molybdenums element box with labels e, a, a, a point…
- e: Element Name - a (pointing to 42): Atomic Number - a (pointing to Mo): Element Symbol - A (pointing to 95.94): Average Atomic Mass
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laboratory simulation lab data mass of sodium chloride (g) 18.6 mass of…
18600
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1) recall from the introduction that to tare (or zero) a balance means …
B. No calculation is needed to determine the mass of the sample added to the weighing boat.
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which act regulates the chemicals used in mining and elsewhere? toxic s…
Toxic Substance Control Act
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how many ions of sodium are in a 71.0 g na₂so₄ sample? ? × 10^? na⁺ ion…
The coefficient (green box) is \( 6.02 \) (or \( 6.02 \)) and the exponent (yellow box) is \( 23 \). So the number of \( \text{Na}^+ \) ions is \( \boldsymbol{6.02 \times 10^{23}}…
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how many atoms of hydrogen are present in a sample of c₆h₈o₆ that has 2…
Green box: 1.97, Yellow box: 24
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g c → moles c → moles h → atoms h what conversion factor is used to con…
1 mole C / 12.01 g C
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which pathway correctly describes how to solve the problem below? \how …
C. g C → moles C → moles H → atoms H
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theobromine molar mass in this problem, we want to eventually determine…
The number of nitrogen atoms is approximately \( \boldsymbol{3.34\times10^{24}} \) (or more precise \( 3.343\times10^{24} \))
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read the following passage from a paper discussing the effects of disca…
D. Cigarettes should be banned because smoking kills not just smokers but the people and animals around them.
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topic: writing progress question id: 1062848 the movement of the progre…
The most effective conclusion is: In closing, the evidence for wearing sunscreen is clear and bright, while the arguments against it are partly cloudy at best. Use it every day, a…
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the movement of the progress bar may be uneven because questions can be…
A. Linking
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what is the mass of one molecule of glucose, c₆h₁₂o₆? the molar mass of…
The coefficient (green blank) is \( 2.992 \) (or \( 2.99 \) or \( 3.00 \) depending on rounding, but more accurately from the calculation above \( 2.992 \)) and the exponent (yell…
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which pathway correctly describes how to solve the problem? \what is th…
A. particles \( \ce{C5H12} ightarrow \) mol \( \ce{C5H12} ightarrow \) mass \( \ce{C5H12} \)
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a chemist obtains a sample of sodium sulfate, $\\ce{na_{2}so_{4}}$, wit…
The coefficient (green blank) is \( 3.01 \) and the exponent (yellow blank) is \( 23 \). So the answer is \( 3.01 \times 10^{23} \) formula units.
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can you think of any other common workplace hazards – especially ones i…
3. Slippery floors 4. Poor ergonomics (e.g., uncomfortable chairs) 5. Exposure to chemicals
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mass number = big number atomic number = smaller number protons = small…
3. Protons = 1 4. Neutrons = 0 5. Electron = 1 6. E.C= 1 7. What is the valence (the last number in the e.c) electron? 1 8. What group is H in the periodic table? Group 1 9. What …
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mass number = big number atomic number = smaller number protons = small…
3. Protons = 17 4. Neutrons = 18.5 5. Electron = 17 6. E.C= 2,8,7 7. Valence electron = 7 8. What group is Cl in the periodic table? Group 17 (or 7A) 9. What PERIOD is Cl in the p…
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mass number = big number atomic number = small number protons = small #…
3. Protons = 3 4. Neutrons = 4 5. Electron = 3 6. E.C= 2, 1 7. What is the valence (the last number in the e.c) electron? 1 8. What group is Li in the periodic table? Group 1 9. W…
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mass number = big number atomic number = small number protons = small #…
3. Protons = 3 4. Neutrons = 4 5. Electron = 3 6. E.C = 2,1 7. Valence electron = 1 8. Group = 1 9. Period = 2 10. B
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unlawful chemistry: the chemical equation below is unbalanced. you will…
- Mass of $\text{O}_2$ that reacts: $\approx 32.1\ \text{g}$ - Mass of $\text{Li}_2\text{O}$ produced: $\approx 59.9\ \text{g}$ - Total mass of all reactants: $\approx 59.9\ \text…
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the most common ways to treat cancer include _______. a. chemotherapy, …
A. chemotherapy, radiation, and surgery
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which of the following statements about tobacco products is true? a. to…
A. Tobacco products contain over 4,000 different chemicals.
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which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
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carbon monoxide, a substance found in tobacco smoke, is also found in _…
B. vehicle exhaust
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which of the following chemicals, found in tobacco smoke, is also found…
B. acetone
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which of these is a light element? (1 point) iron oxygen carbon lithium
D. Helium
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drugs modify the brain chemistry and change behaviors. please select th…
T. True
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8. a strong acid solution has h+=1.0×10⁻³ m. after dilution (adding wat…
- How does the pH change? The pH increases (from 3 to 4). - Initial pH: \( 3 \) - Final pH: \( 4 \) - Initial pOH: \( 11 \) - Final pOH: \( 10 \)
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1) where do you need to orient your eye level to take an accurate readi…
To take an accurate reading of the meniscus, you need to orient your eye level **horizontally with the meniscus** (specifically, at the same level as the bottom of the concave men…
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lock both doors on her side of the car. the smile nola gives mrs. dietr…
Nola views talking with her mother (through their shopping trips) as a meaningful, comforting bond that became an important anchor after her parents' separation. Evidence includes…
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1 racha de semanas nivel 4 ar 4 of 4
Argon has 8 valence electrons.
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bonds can be formed between atoms that come from the same region of the…
- Ionic: Atoms from the metal region (left/groups 1-2) and nonmetal region (right/groups 16-17) of the periodic table. - Metallic: Atoms from the metal region (left/middle of the …
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claim - evidence - reasoning you solved the four digital locks, gatheri…
### Claim: The strength of inter - and intramolecular forces directly influences the physical properties of substances, such as boiling point, melting point, and solubility. Subst…
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4. true or false: in order for katie to hear paul, air molecules must *…
False
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how to calculate molar mass (molecul... molar mass in 3 easy steps watc…
- \( \ce{MgCl2} \) matches \( 95.205 \, \text{g/mol} \) - \( \ce{(NH4)2CO3} \) matches \( 96.086 \, \text{g/mol} \) - \( \ce{C9H9O4} \) matches \( 181.050 \, \text{g/mol} \)
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individual elements. it is linked here -> periodic table. *** remember …
The total mass of the compound is $310.178$ g/mol. For each element: - Ca: $3\times40.078 = 120.238$ g/mol - P: $2\times30.974 = 61.948$ g/mol - O: $8\times15.999 = 127.992$ g/mol
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using the symbols in the parenthesis and the number of each color from …
B. \( \text{GO}_4\text{PY}_2\text{Pu}_6\text{Wh} \) (assuming the second option is labeled B, as per the options given with O having subscript 4, Y subscript 2, Pu subscript 6 and…
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match the package to the number. mole reem of paper dozen pair 12 500 2…
- Mole: \(6.02\times10^{23}\) - Reem of paper: 500 - Dozen: 12 - Pair: 2
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a) a strong base b) a weak acid c) a strong acid d) a weak base →9. a s…
9. b) a base 10. c) remains red
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b) concentrate strong acid c) dilute weak acid d) concentrate weak acid…
7. a) dilute strong base 8. d) a weak base
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1. a solution has a ph of 4. the solution is (acidic)/ basic. 2. a solu…
1. acidic 2. basic 3. neutral 4. dilute 5. concentrate 6. b) concentrate strong acid 7. dilute strong base
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covalent compound naming first, identify whether these compounds are io…
| # | Chemical Formula | Type of Compound: Ionic or Covalent | Compound Name | |----|----|----|----| |21)|$\text{CdBr}_2$|Ionic|Cadmium Bromide| |22)|$\text{Cr(Cr}_2\text{O}_7\tex…
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all chemicals in the lab should be considered dangerous true false pipe…
1. True 2. False 3. False 4. False
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if an acid is splashed on your skin, wash it at once with ○ soap ○ oil …
1. plenty of water 2. wash your hands thoroughly with soap and water 3. True
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personal eyeglasses provide as much protection as a face shield safety …
1. none of the above 2. tied back and kept away with hairband, pins, etc. 3. all of the above
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if you wear contact lenses in the school laboratory 1 point ○ take them…
1. take them out before starting the lab 2. ask the instructor before proceeding 3. disposed of according to your instructor's directions
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if a laboratory fire erupts, immediately: - notify your instructor - ru…
1. notify your instructor 2. anytime chemicals, heat or glassware are used
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what might cause chemical weathering volcanic eruptions growing plants …
C. Acid Rain
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why does ice float? as water freezes, air becomes trapped between the h…
B. As water freezes, it expands and its density decreases.
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montgomery county public schools draft 2018 hs ngss chemistry naming bi…
1. $\text{N}_2\text{O}_3$: dinitrogen trioxide 2. $\text{SCl}_2$: sulfur dichloride 3. $\text{IF}_5$: iodine pentafluoride 4. $\text{SiCl}_4$: silicon tetrachloride 5. $\text{BCl}…
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refer to paragraphs 4 and 5. the author says that president roosevelt a…
1. Roosevelt’s crafty plan failed, but the Supreme Court did keep social security and several other New Deal programs in place. 2. In time, some of the older justices retired or d…
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question 8 (1 point) what is the molar mass of potassium chloride, kcl …
74.55 g/mol ### Question 9:
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question 7 (1 point) what is the molar mass of magnesium metal, mg from…
The molar mass of Magnesium (Mg) is approximately 24.305 g/mol.
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what is the molar mass of the element a 1.008 b 15 c 1 d 30.974
a. 1.008
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question 5 (1 point) which of the following would have the highest amou…
d. 10.0 mole of Magnesium, Mg ### Question 6 (Avogadro's Number)
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what is the molar mass of the compound, potassium chloride, kcl? k = 39…
b. 74.548 ### Second Question (Molar Mass of CaS)
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what is the molar mass of the element hydrogen - h? a 1 b 15 c 30.974 d…
d. 1.008
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question 1 (1 point) what is the molar mass of the element tellurium - …
d. 127.60
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one of the best ways to succeed in college is by devising and adhering …
C. "downtime"
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elo week 1 explain how figurative lan... one of the best ways to succee…
C. by suggesting that students need to take time to consider their priorities
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one of the best ways to succeed in college is by devising and adhering …
B. It contributes to the informality.
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one of the best ways to succeed in college is by devising and adhering …
A. by suggesting that the specificity of the schedule is important
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a science lab team was questioning how best to describe sound energy. t…
Dixie
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name: teacher: date: q2 chemistry: unit 4 exam review use the following…
Diagram B ### Question 6
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name: q2 chemistry: unit 4 exam review date: prepwork part 1: mixed pra…
E. 5 ### Question 4
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what is the mass of ice in grams of a 0.485 cm³ sample if its density i…
1. $0.445\ \text{g}$ 2. $0.0304\ \text{cm}^3$ 3. $3.02\ \text{g}$ 4. $2.94\ \text{mL}$ 5. $6.96\ \text{g/cm}^3$
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review for midterm, ws#6 bonding 1. fill in the best answer for each of…
1. a) valence b) 2 c) +1 d) 4 e) 8 f) gaining; losing g) share h) lose i) Valence Shell Electron Pair Repulsion j) Argon (Ar) k) Helium (He) l) crystal lattices m) negative (-) n)…
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how many atoms of p are present in a sample of p₂o₅ that contains 5.2 ×…
2.1 x 10²³ atoms of P
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there are $1.2 \\times 10^{24}$ atoms of carbon in a sample of aluminum…
3.0 moles H (Option: 3.0 moles H)
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calculate the mass in grams of 64.0 ml of chloroform, an anesthetic tha…
$95.3\space g$
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there are 2.5 moles of hydrogen in a sample of aluminum acetate, al(c₂h…
0.28 moles $Al(C_2H_3O_2)_3$
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if a blood sample has a mass of 231. g and a volume of 232. ml, what is…
$0.996$
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there are $1.5 \\times 10^{24}$ atoms of carbon in a sample of aluminum…
0.42 moles Al
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how many molecules of vitamin a, c₂₀h₃₀o, are in a sample that contains…
B. \( 2.0 \times 10^{21} \) molecules of \( \text{C}_{20}\text{H}_{30}\text{O} \)
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convert this temperature to °c. be sure your answer has the correct num…
477 K (or 477.15 K, but considering significant figures from 204, 477 K is suitable)
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how many atoms of p are present when a p₂o₅ sample contains 5.2 × 10²³ …
\( 2.08 \times 10^{23} \) atoms P (So the green box is 2.08 and the yellow box is 23)
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how many moles of s are present in 3.6 × 10²⁴ formula units of al₂s₃? p…
Approximately \( \boldsymbol{18} \) moles (or more precisely \( \approx 17.9 \) moles) of \( \text{S} \) are present. (Note: If we use \( 6.02 \times 10^{23} \) for Avogadro's num…
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a cake is baked at 400. °f. part: 0/2 part 1 of 2 convert this temperat…
$\approx 204^\circ\text{C}$ (or $200^\circ\text{C}$ depending on significant figures; but more accurately, approximately 204 $^\circ\text{C}$)
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we want to determine how many molecules of c₁₂h₂₂o₁₁ are present when a…
B. \( \frac{1\text{ mlc }C_{12}H_{22}O_{11}}{12\text{ atom }C} \)
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which of these is not a correct internal conversion for c₁₂h₂₂o₁₁? note…
B. \( \frac{1\ \text{mlc}\ \text{C}_{12}\text{H}_{22}\text{O}_{11}}{12\ \text{mole}\ \text{C}} \)
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yana uses 16.4 liters of helium to blow up a balloon for a party. if th…
\( 0.732 \) (or if we consider that maybe the molar volume is taken as 22.4 L/mol exactly, then the calculation is as above. So the number of moles is approximately \( 0.732 \) mo…
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gingerol, c₁₇h₂₆o₄, is a compound similar to capsaicin that is being st…
0.510 (or 0.5096, depending on significant figures; 150.0 has 4 sig figs, molar mass calculation gives ~294.38, so result should have 4 sig figs? Wait, 150.0 is 4, 294.378 is ~6, …
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a gas water heater generates co₂ and co gas as byproducts of combustion…
314
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what is the volume of 8.25 moles he at stp?? l heremember, 1 mole = 22.…
185 L (Wait, no, wait, 8.25 *22.4 = 184.8. If we consider significant figures, 8.25 has three, 22.4 has three, so the result should have three. 184.8 rounded to three significant …
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which conversion factor allows us to move between moles and gas volume …
1 mole = 22.4 L
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what is the mass of 4.0 moles of sodium, na? ? g na remember, 1 mole = …
92 (or 91.96 depending on precision, but with significant figures from 4.0, 92 g)
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which conversion factor allows us to move between moles and mass? 1 mol…
B. 1 mole = molar mass (assuming the options are labeled A, B, C with the second option as B; if the original options have different labels, adjust accordingly based on the second…
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carry out each calculation and give the answer using the proper number …
\(197.1\space mL\) ### Part 2:
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how many atoms are in 4.0 moles of sodium, na? ? × 10^? atoms na rememb…
The coefficient (green box) is \(2.4\) and the exponent (yellow box) is \(24\), so the number of atoms is \(\boldsymbol{2.4\times 10^{24}}\) atoms Na.
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which conversion factor allows us to move between moles and atoms? 1 mo…
1 mole = \(6.02 \times 10^{23}\) particles
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carry out each calculation and give the answer using the proper number …
\( 197 \) (or \( 197.1 \) depending on interpretation, but likely \( 197 \) as three significant figures) ### Part 2 of 2
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ethanol is the common name for a compound used as an antiseptic and a d…
\(46.07\) (or \(46.068\))
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acetylsalicylic acid is a pain reliever, fever reducer, and anti - coag…
\(180.15\) (or \(180.154\)) g/mol
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a single atom of sodium has a mass of 22.99 amu. what is the mass, in g…
22.99
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a single atom of calcium, ca, has a mass of 40.08 amu. what is the mass…
40.08
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consider the true analogy showing the relationship between amu and gram…
3. (Ni) 59 amu : atom :: 58.69 g : mole
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carry out each calculation and give the answers using the proper number…
\(20.0\)
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puzzlemaker is a puzzle generation tool for teachers, students and pare…
### Across: 3. METALLIC 7. COVALENT 8. BONDING 9. PROTONS 12. FAMILIES (filled) 13. NITROGEN 14. ATOMIC RADIUS 16. [Teacher's Name, e.g., SMITH] 17. MERCURY ### Down: 1. OXYGEN 2.…