化學
化學反應、化學計量、分子結構與元素性質。
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chemistry single replacement reaction worksheet using the activity seri…
1. $\text{Ag} + \text{KNO}_3 ightarrow \text{NR}$ 2. $\text{Zn} + 2\text{AgNO}_3 ightarrow \text{Zn(NO}_3\text{)}_2 + 2\text{Ag}$ 3. $2\text{Al} + 3\text{H}_2\text{SO}_4 ightarrow…
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things to do 1) make notes about the main types of weapons used in wwi.…
1. Main types of WWI weapons include: - Infantry weapons: Rifles, bayonets, hand grenades, machine guns - Artillery: Field guns, howitzers, heavy siege guns - Chemical weapons: Ch…
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describe the trends in electron configuration in the periodic table by …
1. The number of valence electrons **increases** from the left to right across a period. 2. The number of valence electrons **stays constant** from the top to the bottom of a grou…
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lesson 7 - new information and predictions on models name _____________…
1. D. 1.5 nm 2. H. Bromine evaporates into a gas. 3. C. Iodine, because its covalent radius is approximately 1.3 nm, and it is still a solid at 100°C because its melting point is …
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use the periodic table to answer the following questions. how many vale…
A=2 B=2 C=4 What is the charge of an oxygen ion? -2
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1 balanced the equation for this reaction, and answer the questions. $\…
Balanced equation: $2\text{C}(s) + 2\text{H}_2\text{O}(g) ightarrow \text{CH}_4(g) + \text{CO}_2(g)$ a) Theoretical mass of CH₄: $\approx 156.9\ \text{g}$ b) Percent yield: $\appr…
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1. balance the equation for this reaction, and answer the questions $\b…
a) $157.0\ \text{g}$ b) $80.25\%$
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use the periodic table to answer the following questions. how many vale…
6
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4 drag each label to the correct location. sort the chemical reactions …
Releases Energy: - respiration in cells - producing electric current - burning a candle Absorbs Energy: - activating a cold pack - photosynthesis - baking bread
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use the periodic table to answer the following questions. how many vale…
2
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use the periodic table to answer the following questions. how many vale…
A = 3 B = 2
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use the periodic table to answer the following questions. how many vale…
2
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four: percent composition objectives: swbat determine the percent compo…
## Example 1 Total Mass of the compound = $2\ \text{g} + 16\ \text{g} = 18\ \text{g}$ $\% \text{Hydrogen (H)} = \frac{2}{18} \times 100 \approx 11.11\%$ $\% \text{Oxygen (O)} = \f…
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melting a metallic filler which flows across the joint and cools to for…
- Brazing → melting a metallic filler which flows across the joint and cools to form a solid bond - Check Valve → mechanical device which allows gas to flow in only one direction …
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how many atoms of sodium are in 16.09 moles of na? type your answer in …
1. $9.69 \times 10^{24}$ 2. $1.03 \times 10^{25}$ 3. $4.19 \times 10^{-13}$
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fill in the blanks to complete the sentences. in aluminum sulfate $\tex…
2 moles of Ag, 3 moles of S, and 12 moles of O
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12 select the correct answer. mary is looking for a way to identify his…
B. She should look at the style of the artist's creations.
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a mixture of gases contains 2.14 g of $n_2$, 5.85 g of $h_2$, and 4.18 …
Partial pressure of $\text{N}_2$: $\approx 0.109$ atm Partial pressure of $\text{H}_2$: $\approx 4.12$ atm Partial pressure of $\text{NH}_3$: $\approx 0.349$ atm
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chemistry lesson: limiting reactants andres hooper examples 1. what mas…
The smallest amount is the one that can be made because one of the reactants runs out.
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chemistry lesson: limiting reactants andrew hooper examples 1. what mas…
## Mass of iron: 195 g ## Multiple-choice answer: balanced reaction
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chemistry lesson: limiting reactants andres hooper examples 1. what mas…
195 g of iron can be formed ---
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chemistry lesson: limiting reactants andres hooper examples 1. what mas…
B. Changed it to mole Al
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the ozone layer is important because it protects life from damaging ult…
C. Early bacteria and plants released the oxygen needed to make ozone.
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if a scientist tells us that two atoms separate from one another, what …
Microscopic
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which of the following is an example of a macroscopic observation? the …
A basketball is an orange sphere made from leather or rubber.
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which of these is true for a molecular model like the one shown? we can…
The model shows how the various atoms are connected in the molecule.
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which chemical layer of earth makes up most of its volume? *○ crust○ ma…
1. mantle 2. True 3. core
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just like in the cheese sandwich recipe, balanced reactions deal with p…
moles
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what is the atomic mass of an oxygen isotope that has 8 protons and 10 …
C. 18 amu
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what is a substance that cannot be broken down chemically into a simple…
D. an element
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which statement is completely accurate? ○ atoms of the same element alw…
Atoms of the same element can have different numbers of neutrons.
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what is the mass number of a carbon isotope that has 6 protons and 7 ne…
13 amu
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32. write the electron-configuration notation for the element whose ato…
a. $1s^22s^1$ b. $1s^22s^22p^2$ c. $1s^22s^22p^4$ d. $1s^22s^22p^63s^23p^1$
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which term describes elements with different atomic masses due to varyi…
○ isotopes
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how is mass number calculated? ○ by subtracting the mass of the protons…
by adding the mass of the protons and neutrons
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30. determine the highest occupied energy level in the following elemen…
a. 1 b. 2 c. 3 d. 4 e. 5
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5. which is the lowest energy level that can have a p orbital? 6. is it…
5. The lowest energy level is $n=2$ 6. No, it is not possible. 7. A ground state atom has all electrons in the lowest available energy levels; an excited atom has at least one ele…
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select the correct answer. based on your knowledge of word parts, compl…
C. equal
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31. write the orbital notation for the following elements. (hint: see s…
a. P: Orbital notation: $1s^2 2s^2 2p^6 3s^2 3p^3$ Box notation: $\underset{1s}{\uparrow\downarrow} \quad \underset{2s}{\uparrow\downarrow} \quad \underset{2p}{\uparrow\downarrow}…
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electrons and their arrangement in atoms chemistry name_________ period…
## Orbital Box Diagrams & Noble Gas Configurations 1. **Titanium (Ti)** - Orbital Box Diagram: ``` [Ar] 4s: ↑↓ 3d: ↑ ↑ □ □ □ ``` - Noble Gas Configuration: $[Ar] 4s^2 3d^2$ 2. **S…
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chapter 7 review concept practice 44. list three common ways that matte…
1. Mass (example: 500g iron block) 2. Volume (example: 2L water) 3. Amount in moles (example: 1 mol C atoms) --- ### Question 46
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practice problems 29. a. 9.03 g mg combine completely with 3.48 g n to …
29a. 72.2% Mg, 27.8% N 29b. 87.1% Ag, 12.9% S 30. 93.0% Hg, 7.0% O
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13 select the correct answer. mary is looking for a way to identify his…
B. She should look at the style of the artist's creations.
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what is pigment? * a. a chemical that speeds up concrete curing b. a ma…
1. B. A material added to concrete to change its color 2. B. To check the soil that will be mixed with concrete 3. C. 27 cubic feet
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quiz question 2 of 10 george washington carver introduced the concept o…
crop rotation
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a triangular slab has a base of 16 ft, a height of 12 ft, and is 5 inch…
$\frac{40}{27}$ or approximately 1.48 cubic yards --- ### Second Problem (Trapezoidal Slab)
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what is portland cement? * a. a type of gravel b. the binding agent in …
1. B. The binding agent in concrete 2. A. A mixture of cement, sand, and water used to bond bricks or blocks together 3.
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solve the following problems. 6. how many grams of oxygen can be produc…
6. $\boldsymbol{39.2\ \text{g}}$ 7. $\boldsymbol{17.5\ \text{g}}$ 8. $\boldsymbol{109\ \text{g}}$
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
28.45%
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
B. formula mass
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class goal: a b or better on every assessment name h. chemistry b date …
1. Boyle's Law states that for a fixed amount of gas at constant temperature, the pressure of the gas is inversely proportional to its volume (as pressure goes up, volume goes dow…
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
B. CH₃
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multiple-choice question why does oxygen steal electrons from alkali me…
A. Oxygen has a smaller radii than alkali metals and has a greater ionization energy and electronegativity than the alkali metals.
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
## Step2: Calculate total mass of Na Total Na mass = $2\times22.99 = 45.98$ g/mol ## Step3: Compute percent by mass $\text{Percent Na} = \frac{45.98}{142.05} \times 100 \approx 22…
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
AB₃
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percent composition and molecular formula quiz complete time remaining …
$2 \times$ subscript of H in empirical formula. - Option4: Correct. By definition, each subscript in the molecular formula is $n$ times the subscript in the empirical formula.
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day 5 - key vocabulary and concepts name date match the science vocabul…
1. J. Solar Energy 2. D. Kinetic Energy 3. K. Work 4. G. Law of Inertia (Newton’s 1st Law) 5. I. Potential Energy 6. B. Electrical Energy 7. H. Light Energy 8. C. Energy Transform…
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
by adding them to see if they total 100
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day 2 – ionic names and formulas formative 1. name the following ionic …
| Ionic Compound | Ionic Name | |----------------|------------| | $\text{Ag}_2\text{S}$ | Silver sulfide | | $\text{CsF}$ | Cesium fluoride | | $\text{CoCl}_3$ | Cobalt(III) chlor…
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percent composition and molecular formula quiz complete 1 2 3 4 5 6 7 8…
: Only molecular formulas show the actual number (ratio) of atoms; empirical formulas show the simplest whole-number ratio. - Option C is correct: Using the empirical formula and …
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beside each description, write p for proton, e for electron, and n for …
1. p 2. e 3. n 4. p 5. e 6. e 7. e 8. p, n 9. e 10. n 11. p 12. n 13. n 14. p 15. e
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which of the following human activities would most likely lead to subsi…
C. Excess removal of water from underground reservoirs
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the agricultural industry utilizes fertilizer and pesticides to boost c…
A. Runoff from the farms can cause overgrowth of plant life in local ponds, lakes, and rivers, reducing oxygen levels and impacting animal life.
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which of the following would not be a beneficial activity on groundwate…
B. Increase use of fertilizers on lawns
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2 david is investigating the properties of soil using the sample shown.…
The top layer is dark because it contains a lot of organic matter.
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the number of atoms on the product side total mass of products. the tot…
B. Line B --- ### Question 5
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2. what is the mole ratio of sodium carbonate to aluminum carbonate in …
B. 3:2
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name brandon hmultiple choice: circle the correct multiple choice answe…
1. b. up a group and from left to right across a period 2. b. Fluorine 3. a. down a group and from right to left across a period 4. c. the principal quantum number [also known as …
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4. the graph shows the relationship between moles of a reactant and mol…
B. Line B --- ### Question 5
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question 5 which claim should make a consumer think twice about buying …
*Lose 10 lbs. in the first week without starving!*
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1. dry goods should be stored. ○ a) underneath the sink. ○ b) in a cool…
1. b) In a cool, dry, dark place, away from chemicals and cleaners. 2. b) False 3. (Incomplete question, no answer available)
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| metal symbol | metal valance | non-metal symbol | non-metal valance |…
| Metal | No-metal | Metal Symbol | Non-Metal Symbol | Metal Valence | Non-Metal Valence | Compound Name | Formula | |-------|----------|--------------|------------------|--------…
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write the name of the compound listed below. -> nacl - naf -> kbr - $k_…
- NaF: Sodium Fluoride - $K_2O$: Potassium Oxide - $ZnCl_2$: Zinc Chloride - $H_2O$: Water (or Dihydrogen Monoxide; common name is Water) - $AlCl_3$: Aluminum Chloride - $MgCl_2$:…
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a potassium ion is written out as $k^+$. from its symbol (charge) we kn…
Lost one electron.
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
C. $\underline{\text{2 atm}} ightarrow$
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
get 4 P atoms, multiply $\text{PCl}_5$ by 4: $4\text{PCl}_5$ (now 4 P atoms). ## Step3: Check Cl atom balance Left side: $6\text{Cl}_2$ has $6\times2=12$ Cl atoms. Right side: $4\…
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
one atom of iron and three atoms of chlorine.
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
$\boldsymbol{H_2SO_4(aq) + 2NaOH(aq) ightarrow Na_2SO_4(aq) + 2H_2O(l)}$
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
D. (aq)
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oil companies have recently started fracking efforts in minas area. fra…
manufacturing
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9. ___ ca + ___ $h_2o$ → ___ $ca(oh)_2$ + ___ $h_2$ 10. ___ $secl_6$ + …
9. $\boldsymbol{1\ \text{Ca} + 2\ \text{H}_2\text{O} ightarrow 1\ \text{Ca(OH)}_2 + 1\ \text{H}_2}$ 10. $\boldsymbol{1\ \text{SeCl}_6 + 1\ \text{O}_2 ightarrow 1\ \text{SeO}_2 + 3…
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writing and balancing chemical equations quiz complete 1 2 3 4 5 6 7 8 …
Step2: Count right Sr atoms Right Sr count: $2$ ## Step3: Count left O atoms Left O count: $2$ ## Step4: Count right O atoms Right O count: $2$ ## Step5: Identify unbalanced equat…
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balancing chemical equations worksheet count your atoms and then balanc…
1. $\boldsymbol{1}$ $\ce{O2}$ (balanced: $\ce{2H2 + 1O2 -> 2H2O}$) 2. $\boldsymbol{1}$ $\ce{O2}$ (balanced: $\ce{2Mg + 1O2 -> 2MgO}$) 3. $\boldsymbol{1}$ $\ce{F2}$ (balanced: $\ce…
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types of bonds practice ionic bond between a metal and non-metal (m + n…
| Compound | Element 1 (metal or non-metal?) | Element 2 (metal or non-metal?) | Bond Type | |----------------|----------------------------------|---------------------------------…
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part 2: atomic structure & chemistry 10. name the three parts of an ato…
10. (Note: This question is cut off and cannot be answered) 11. Protons 12. Neutrons 13. Electrons 14. Potassium (K) Protons (P): $19$ Neutrons (N): $20$ Electrons (E): $19$ 12. C…
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15. $3.01 \\times 10^{23}$ atoms ni 16. 1000. atoms al convert to numbe…
$5.12 \times 10^{24}$ atoms of Fe (rounded to 3 significant figures)
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6. which of the following is true of a limiting reagent? i. it is a rea…
I, II, and III
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5. how many $h_2$ molecules are needed to make 4.00 moles of water in t…
# Explicación: ## Paso 1: Relacionar moles de H₂ y H₂O De la reacción balanceada $2\text{H}_2 + \text{O}_2 ightarrow 2\text{H}_2\text{O}$, la relación molar es $\frac{2\ \text{mol…
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2. a chemical reaction that theoretically could produce 200 g of substa…
70%
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which type of bond will most likely be found in hbr given that the elec…
a polar covalent bond
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which compound is an exception to the octet rule? h₂o hcl ccl₄ clf₃
duet rule, satisfied). - $\ce{HCl}$: Cl has 7 valence e⁻, 1 from H: $7+1=8$; H has 2 e⁻ (satisfied). - $\ce{CCl4}$: C has 4 valence e⁻, 4 from Cl: $4+4=8$; each Cl has $7+1=8$ e⁻.…
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which element has the greatest number of valence electrons available fo…
Boron (Group 13), Calcium (Group 2), Chlorine (Group 17) ## Step2: Get valence electrons per group Group 16: 6, Group13:3, Group2:2, Group17:7 ## Step3: Compare valence electron c…
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which prefix would appear in the iupac name for a covalent compound tha…
tetra-
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how does the periodic table help in predicting the formula of a stable …
B correctly describes ionic charge behavior from the periodic table, which is key to predicting stable ionic compound formulas by balancing cation/anion charges.
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b. list your major variable costs examples: seeds, labor, water, fertil…
B. List Your Major Variable Costs - Fuel for farm equipment - Packaging for harvested crops - Veterinary care for livestock - Irrigation system maintenance C. List Your Potential …
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what is the ratio of al³⁺ ions to s²⁻ ions in a neutral compound?○ 1:1○…
$\text{S}^{2-}$ = $y$. Total negative charge = $2y$ ## Step3: Set charges equal for neutrality $$3x = 2y$$ ## Step4: Solve for ratio $x:y$ $$\frac{x}{y} = \frac{2}{3} \implies x:y…
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when applied to a dish, soap makes grease soluble in water. which expla…
A. The nonpolar end of a soap molecule attaches itself to grease.
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an element has six valence electrons available for bonding. which group…
2 has 2 valence electrons, group 4 has 4, and group 18 (noble gases) has 8 (full valence shell).
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which statement is true about ionic compounds? solid ionic compounds ar…
are nearly insoluble, depending on factors like lattice energy and ion hydration energy.
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which statement describes covalent bases? they have hydroxide ions. the…
which are molecular compounds acting as bases by accepting H⁺. - Option D: Ionic and covalent compounds have different naming rules; covalent bases do not follow ionic compound na…