Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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match the element with the description noble gas 1. he alkali metal 2. …
noble gas - 1. He alkali metal - 3. Li halogen - 4. F alkaline earth metal - 2. Be
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match the element to the description heaviest element that can be mined…
1. heaviest element that can be mined on earth: 3. U 2. metalloid: 4. Si 3. transition metal (not inner transition metal): 1. Sc 4. inner transition metal (with lowest atomic numb…
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question 1 (0.666666667 points) match the element to the description no…
nonrepresentative metal: 4. Sc representative metal: 2. Li nonrepresentative nonmetal: 1. none representative nonmetal: 3. H
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compare the number of protons, neutrons, electrons, and nucleons for th…
1. A. 3 2. A. 3 3. A. 3 4. B. 4 5. A. 3 6. A. 3 7. E. 6 8. E. 7 9. F. electrons 10. F. electrons 11. I. neutrons 12. F. electrons
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find the average atomic mass (atomic weight) for lithium on the periodi…
1. C. 6.941 2. A. Li - 7 3. A. Li - 7 4. B. Li - 6
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calculate the average atomic mass for an unidentified element given the…
1. F. 0.78994 2. G. 18.946744 3. E. 0.10001 4. I. 2.498834 5. D. 0.11013 6. H. 2.861463 7. B. 24.307 8. L. Mg
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1 define each term and provide an example of each type of compound. com…
| Compound Type | Definition | Example | |--|--|--| | Molecular | A compound formed by sharing of electrons between non - metal atoms | Water ($H_2O$) | | Ionic | A compound forme…
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o-17 0.0381 16.9991317 amu ( _3_ )(16.9991317 amu) = _4_ amu o-18 0.205…
E. 0.997572, B. 15.9994791, D. 0.000381, H. 0.0064767, C. 0.0020514, G. 0.03692348, A. 15.9995
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calculate the average atomic mass for oxygen given the following: isoto…
1. E. 0.997572 2. B. 15.9994791 3. D. 0.000381 4. H. 0.0064767 5. C. 0.0020514 6. G. 0.03692348 7. A. 15.9995
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calculate the mass in grams of 1 mole of neutrons given the following c…
1. G 2. I 3. Calculate $(1.674927\times 10^{-24}\text{ g})\times(6.02214\times 10^{23})\approx1.00867$ g/mol 4. B
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fill in the information for the anion $^{130}_{x}te^{- 2} x$ is the ato…
1. A. 52 2. A. 52 3. D. 78 4. B. 54 5. E. 130
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fill in the information for the anion $^{128}_{x}te^{- 2}$ x is the ato…
1. A. 52 2. A. 52 3. F. 76 4. B. 54 5. G. 128
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fill in the information for the cation $^{59}_{x}ni^{+3} x$ is the atom…
1. B. 28 2. B. 28 3. E. 31 4. D. 25 5. A. 59
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fill in the information for the isotope ni - 60, or $^{60}_{x}ni$. x is…
1. B. 28 2. B. 28 3. C. 32 4. B. 28 5. F. 60
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answer the questions about the following isotope $^{238}u^{+2}$. the at…
1. K. 92 2. J. 238 3. M. 146 4. L. 90 5. C. 2 6. P. cation
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answer the questions about the following isotope $^{238}u^{+2}$ the ato…
1. K. 92 2. J. 238 3. M. 146 4. L. 90 5. C. 2 6. P. cation
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answer the questions about the following isotope u - 235 or ²³⁵u. the a…
1. K. 92 2. J. 235 3. M. 143 4. K. 92 5. A. 0 6. N. element
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answer the questions about the following isotope $^{1}h^{-1}$ the atomi…
1. B. 1 2. B. 1 3. A. 0 4. (No correct option in given choices, should be 2 for $H^{-}$) 5. F. -1
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answer the questions about the following isotope $^{2}h^{+1}$ the atomi…
1. B. 1 2. C. 2 3. (Based on correct calculation should be 1, not in options) 4. A. 0 5. B. 1
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answer the questions about the following isotope h-3 or $^{3}h$. the at…
1. B. 1 2. D. 3 3. C. 2 4. B. 1 5. A. 0
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complete the following subtraction using significant figures. 5.55555 x…
The result of the subtraction is $555\ \mu g$. The units in the final answer are $\mu g$. So the correct option is $\mu g$.
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it required 500. cal to heat a sample of gold from 25.0 to 35.0 °c. wha…
$(1\ g^{\circ}C/0.0305\ cal)(500\ cal)$ is the correct way to cancel out calories to find the mass of the gold sample. So the correct option is the one with $(1\ g^{\circ}C/0.0305…
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it required 500. cal to heat a sample of gold from 25.0 to 35.0 °c. wha…
1. $\frac{0.0305\ cal}{1\ g^{\circ}C}$ 2. $\frac{1\ g^{\circ}C}{0.0305\ cal}$
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how would you round off your final answer using significant figures? is…
69.7243 amu
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there are two stable isotopes of gallium, $^{69}$ga and $^{71}$ga. calc…
69.724328 amu
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there are two stable isotopes of gallium, ^69ga and ^71ga. calculate th…
isotope abundance relative mass mass contribution Ga - 69 0.601089 68.925580 amu 41.430408 amu Ga - 71 0.398929 70.924701 amu 28.293920 amu
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question 3 (1.666666667 points) there are two stable isotopes of galliu…
41.430408 amu
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there are two stable isotopes of gallium, $^{69}$ga and $^{71}$ga. calc…
A. 0.601089, C. 60.1089/100, D. 0.601089/1
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there are two stable isotopes of gallium, $^{69}ga$ and $^{71}ga$. calc…
abundance
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5.55555 x 10^5 μg + 5.55 x 10^5 μg red gives the greatest uncertainty 1…
True
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question 1 (1.42857143 points) complete the following addition using si…
$\mu g$
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a brainwave pattern is caused by the chemical signals sent between the …
F
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the diameter of a water molecule is 0.00000000033 m. which is the best …
B. 3×10⁻¹⁰ m
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read the passage from chapter 5 of animal farm. at the meetings snowbal…
D. Both Snowball and Napoleon are persuasive leaders and clever animals.
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question 9 (0.75 points) to find the simplest ratio of moles between n …
0.286
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question 9 (0.75 points) to find the simplest ratio of moles between n …
The smallest value among 0.286, 0.543 and 0.316 is 0.286. So you should divide by 0.286. So the answer is 0.286.
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question 2 (0.5 points) saved reflecting back on last week, why do chem…
Atoms are very small, and using their actual counts (like $6.022\times 10^{23}$) would be inconvenient because there are so many of them in even small sample sizes.
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a cylindrical glass tube 15.0 cm in length is filled with ethanol. the …
$1.02\ cm$
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1.5 g/cm^3 x (48 in x 60 in x 6.0 in) x (1 kg / 1000g) x (16.387 cm^3 /…
$1.02\ cm$
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multiple - choice question what should you do if chemicals splash onto …
Jump into the safety shower and stand under it for 15 minutes
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multiple - choice question why do synthetic fabrics pose a safety hazar…
Fuzzy fabrics can catch fire easily and melt
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multiple - choice question which items must always be worn when working…
Gloves, Fitted clothing, A lab apron, Goggles
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7. fill in the blanks. mass # (p⁺ + n⁰)→ ₈¹⁶o ₁₅³¹p ₃₀⁶⁵zn atomic # (p⁺…
| Isotope Name | Isotope Symbol | Protons | Neutrons | Electrons | Atomic Number | Mass Number | |---|---|---|---|---|---|---| | Argon - 40 | $_{18}^{40}Ar$ | 18 | 22 | 18 | 18 | …
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6. fill in the blanks with either positive or negative. a. fluorine ato…
| Isotope Name | Isotope Symbol | Protons | Neutrons | Electrons | Atomic Number | Mass Number | |----|----|----|----|----|----|----| | Oxygen - 16 | $^{16}_8O$ | 8 | 8 | 8 | 8 | …
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social media interactions can cause your brain to release a chemical ca…
B. dopamine
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multiple - choice question glassware and chemical substances can be hea…
A. Directly over a Bunsen burner flame B. In a water bath C. Using a ring stand support
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multiple - choice question why is it dangerous to heat a closed contain…
The pressure created inside the container can burst it
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multiple - choice question when should you shut the gas off to the buns…
A. If the flame goes out C. If you smell gas D. When the flame sputters
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which of the following is the correct bohr model for a neutral berylliu…
(No options are provided in the text to choose from, but a correct Bohr model for beryllium would have a nucleus with 4 protons and 4 neutrons (not shown in basic Bohr models for …
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what makes water different from other liquids like acetone or mineral o…
Water molecules are polar and form hydrogen bonds
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which station showed that water molecules are attracted to each other a…
B. Station 4: Static Electricity and Water
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a bohr model of a magnesium atom is shown below. label the shells on th…
The innermost shell: K - shell The second shell: L - shell The outermost shell: M - shell
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complete the statements. electrons in the outermost shell of an atom ar…
Electrons in the outermost shell of an atom are called valence electrons. All other electrons in the atom are called core electrons.
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multiple - choice question what part of the burner controls the flame h…
The gas valve - located at the bottom of the Bunsen burner
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multiple - choice question what color should the burner be? blue yellow
A. Blue
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multiple - choice question what steps should be followed when lighting …
Light the match, turn on the gas, put the match to the side of the barrel of the burner
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chemical equation: caco₃ → cao + co₂ number of atoms for each element t…
- For $CaCO_3 ightarrow CaO + CO_2$: - Number of atoms for each element: Ca: 1 - 1, C: 1 - 1, O: 3 - 3. Total number of atoms: 5 - 5. Follows law of conservation of mass. - For $C…
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chemical equation: caco₃ → cao + co₂; number of atoms for each element:…
| Chemical Equation | Number of atoms for each element | Total number of atoms | Does this equation follow Law of Conservation of Mass? | |---|---|---|---| | $6CO_2 + 6H_2O ightar…
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intro to the periodic table - questions instructions: use the periodic …
1) Francium (Fr) 2) Tellurium (Te) 3) Gold (Au) 4) Neon (Ne) 5) Aluminum (Al) 6) Metal 7) Metalloid 8) Non - metal 9) Metal 10) Non - metal 11) Non - metal 12) Group 18 13) Group …
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acetylene gas is not explosive. true false 5 of 5
B. False
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question 11 (3 points) discussion question 3) what determines the numbe…
C. The paint markings (precision of the markings) on the graduated cylinder dictate the decimal places for that tool. Record 1 decimal of uncertainty after the certain markings on…
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tracy makes a list of energy transformations that occur as an engine ru…
3. Chemical energy transforms into gravitational potential energy.
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which best describes how energy changes form in a cars engine? a single…
C. Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy
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which energy transformations occur when a candle burns? thermal energy …
Chemical energy transforms into thermal energy and radiant energy
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atomic theory concept check name: marylie 1. fill in the table with a b…
1. Bohr: Proposed atomic model with electron orbits. Heisenberg: Uncertainty principle. De Broglie: Electron wave - like properties. Schrodinger: Wave mechanics and equation for e…
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bohr heisenberg de broglie schrodinger 2. what are the four parts of da…
1. All matter is made of atoms, which are indivisible and indestructible (not fully accepted). 2. All atoms of a given element are identical in mass and properties (not fully acce…
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what are the safety concerns in the laboratory? chemistry 1. analyze an…
| Name | Safety Rule Broken | Potential Hazard | |--|--|--| | Bill | Not wearing goggles | Chemical splashes or debris in eyes | | Tom | Eating/drinking in lab | Ingestion of chem…
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which of the following are characteristics of ancient greek architectur…
beauty, harmony, and proportion
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bbb. acid donates a proton (h+) = molecule that is formed when a brønst…
bbb. Conjugate base ccc. Carbonyl group ddd. London dispersion force eee. Ester fff. Dodeca - ggg. Imine hhh. Covalent bonds iii. Nitrile jjj. Undeca - kkk. Disulfide lll. Meth - …
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(slide#7) explain what are covalent bonds are and provide an example (s…
- Slide #7: Covalent bonds are chemical bonds that involve the sharing of electron pairs between atoms. For example, in a water molecule ($H_2O$), the oxygen atom shares electrons…
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isotopic abundance - practice problems the atomic mass for each element…
2. The atomic mass of copper is $63.3446$ amu. 3. The atomic mass of silicon is $28.0893$ amu. 4. The atomic mass of gallium is $69.6446$ amu. 6. The atomic mass of lead is $207.2…
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2. ____________ is also called central or union government. 3. the mini…
1. The Government of India 2. 25 3. Question Hour 4. The President 5. Member of Legislative Assembly 6. 30 7. 6 years 8. Ahmedabad 9. The power or authority of a court to hear and…
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question 2 (2 points) from part 2 of the density experiment, you record…
Graduated cylinders are more precise because they have smaller and more closely - spaced volume markings, allowing for more accurate volume readings compared to beakers.
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a graduated cylinder contains 15.75 ml of water. a metal that weighs 2.…
$1.10$
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chest pain that is exacerbated by exercise and is relieved by rest is m…
coronary ischemia
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5) (nh₄)₃po₄ 6) naclo₃
$Na^+ + ClO_3^-$
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ch.- 16 state government fill in the blanks. 1. india has ______ states…
1. 28; 8 2. Central Government 3. 25 4. Question Hour 5. Governor 1. Member of Legislative Assembly 2. 30 years 3. 6 years 4. Ahmedabad 5. The official power to make legal decisio…
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3. ocean currents ch.- 16 state government ✴ fill in the blanks. 1. ind…
1. 28, 8; Central or Union Government; 25; Question Hour; Governor 2. Member of Legislative Assembly; 30; 6 years; Ahmedabad; The power or authority to make legal decisions and ju…
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according to the law of conservation of mass, if an atom of element a h…
a. 16 units
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which of the following statements support the law of mass conservation …
c. Atoms can be rearranged
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a reaction of heating potassium permanganate produces potassium mangana…
$1.6$
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a reaction between ammonia gas and chlorine gas produces ammonium chlor…
$30.2$
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4. how could you separate tellurium dioxide, teo₂, from sio₂? 5. how co…
4. Use a strong - base solution (e.g., $NaOH$) to dissolve $TeO_2$, filter off $SiO_2$, and then precipitate $TeO_2$ by adjusting pH. 5. Treat the mixture with $NaHCO_3$ solution,…
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2.56 g of hydrogen reacts completely with 20.32 g of oxygen to form x g…
22.88 g
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write the formula for each compound. capitalization and subscripts are …
selenium tetrafluoride: SeF₄ oxygen difluoride: OF₂ dinitrogen monoxide: N₂O phosphorus trichloride: PCl₃
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magnesium (24.30 g) reacts with hydrogen chloride (x g) to produce hydr…
$72.92$
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a reaction of 22.85 g of sodium hydroxide with 20.82 g of hydrogen chlo…
33.38
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give the systematic names of these compounds. spelling counts. cui(s): …
Copper(I) iodide Iron(III) oxide Cobalt(II) fluoride Iron(II) oxide
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calcium carbonate, caco₃, decomposes when heated to calcium oxide (cao)…
44
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a reaction of 12.640 g of copper oxide with 0.316 g hydrogen produces 2…
$10.112$
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a reaction of heating calcium carbonate produces calcium oxide and carb…
4.4
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determine the formulas for these ionic compounds. copper(i) bromide: co…
copper(I) bromide: $\text{CuBr}$ copper(I) oxide: $\text{Cu}_2\text{O}$ copper(II) bromide: $\text{CuBr}_2$ copper(II) oxide: $\text{CuO}$ iron(III) bromide: $\text{FeBr}_3$ iron(…
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a nurse is collecting data from a client who is receiving chemotherapy …
A. Stomatitis
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bb. = chemical species that donates an electron pair in a chemical reac…
bb. Lewis base cc. Intermolecular forces dd. Dipole - dipole force ee. Isomer ff. Tetradeca - gg. Acyl chloride hh. Electronegativity ii. Nona - jj. Thioether kk. Alcohol ll. Octa…
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general chemistry 4th edition mcquarrie · rock · gallogly university sc…
sodium sulfite: $Na_2SO_3$ potassium phosphate: $K_3PO_4$ silver sulfate: $Ag_2SO_4$ ammonium nitrate: $NH_4NO_3$
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question 15 of 20 what is the chemical formula for the compound formed …
Formula for potassium - iodine compound: KI Formula for potassium - oxygen compound: $K_2O$
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write the chemical formula for the compound formed by each pair of posi…
Ba(NO₃)₂ Al₂(CO₃)₃ K₃PO₄
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determine the name or formula for each polyatomic ion. formula: co₃²⁻ n…
1. carbonate 2. $SO_{3}^{2 - }$ 3. $SO_{4}^{2 - }$ 4. cyanide
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the table below shows the atomic mass of three isotopes of uranium (u).…
The number of neutrons in the nucleus
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the periodic table consists of a stair - step or zig - zag line near th…
It helps to identify the location of the nonmetals, metals, and metalloids.