Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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Question was provided via image upload.
1. $\text{PF}_3$ → trigonal pyramidal 2. $\text{BeF}_2$ → linear 3. $\text{CCl}_4$ → tetrahedral 4. $\text{GeF}_2$ → bent 5. $\text{BF}_3$ → trigonal planar
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choose the best answer. two elements have an electronegativity differen…
polar covalent
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lets find out how much you know about this topic! this will help us per…
Closed-toe shoes that cover the entire foot.
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there are 20 lines in the poem. the poem is numbered every 5 lines. fro…
## Part A: 2. Troubles will return, but summer lets the speaker forget them for a short time. ## Part B: 4. "And many a scheme did she devise To heal the hurt and soothe the wrong…
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the chemical formula for calcium hydroxide is: ca(oh)₂ calculate the mo…
74.10
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2) choose the best answers using the image. label a is pointing to whic…
intermolecular force
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1. choose the best answer using the periodic table. what is the formula…
○ $\text{N}_2\text{O}_3$
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what characteristic from the piece proves it is a work of fiction? a. t…
D. The passage has a setting, and the reader can learn the characters' thoughts.
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18. choose the best answer. which of these forces/bonds is the stronges…
A. ionic bonding
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21. choose the best answer. which form of matter has the weakest interm…
21. gas 22. a covalent compound without hydrogen bonding 23. polar covalent bond
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which of these is a polyatomic ion?\ \\(\\text{co}_4^{+}\\)\ \\(\\text{…
1. $\text{CO}_3^{2-}$ 2. covalent 3. 5
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choose the best answers using the image. 12. use the image to choose th…
Q2: A. intramolecular force Q3: A. Label B Q4: C. intermolecular force
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subjects & predicates practice assignment name: date: class: directions…
1. **Complete split**: Jeff | pushed his sister Sally off the twisty slide. * Simple subject (circled): Jeff * Simple predicate (boxed): pushed 2. **Complete split**: Sally | bit …
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12. use the image to choose the best answer. label b is showing which f…
12. intramolecular force 13. label B
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10. use the periodic table to choose the best answer. what is the formu…
10. $\boldsymbol{P_3O_2}$ 11. $\boldsymbol{ionic\ bond}$
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8. choose the best answer using a periodic table. which of these compou…
8. a compound with triple bonds 9. metallic bond
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7.000 g of compound x with molecular formula \\(\\ce{c5h8}\\) are burne…
\( -1.4\times10^{2}\ kJ/mol \) (or -140 kJ/mol, but more accurately -1.4×10² kJ/mol)
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6. use the periodic table to choose the best answer. what is the name o…
6. copper (II) sulfide 7. $\text{Sr}_3\text{N}_2$
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4. use the periodic table to choose the best answer. what is the name o…
4. copper (I) nitride 5. calcium iodide
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2. use the periodic table to choose the best answer. what is the name o…
nitrogen tetrafluoride
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1. choose the best answer. the crystalline lattice structure of ____ co…
ionic
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which detail would be most important to include in a summary of the art…
(C) Alchemy included other subjects such as medicine, spiritualism, and art.
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the term route of entry on an sds refers to the way a ____ enters the b…
Chemical (the option corresponding to "Chemical")
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(b) robert boyle lived in the 1600s, and he believed that he changed go…
(A) Alchemy became more like modern chemistry with the work of Robert Boyle, who used the scientific method.
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a local reaction is when a chemical enters the bloodstream. true false
False
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read the section “roots in the ancient world.” which paragraph supports…
(A) But Jabir came up with something new. He believed that the key to the differences between metals was how much mercury and sulfur they contained. Making gold thus required the …
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chemical manufacturers must present which information on the products l…
D. All of the above
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a skull and crossbones pictogram indicates this kind of information abo…
C. Acute Toxicity (assuming the options are labeled as A. Gases under pressure, B. Flammable, C. Acute Toxicity, D. Irritant. If the original option labels are different, adjust a…
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8. match the molecular shapes with the lewis structures. options - trig…
1. $\text{CH}_4$ — tetrahedral 2. $\text{NH}_3$ — trigonal pyramidal 3. $\text{BCl}_3$ — trigonal planar 4. $\text{H}_2\text{O}$ — bent 5. $\text{CO}_2$ — linear
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use the references to access important values if needed for this questi…
\(39.606\) ### Second Calculation: \(\frac{9.21\times10^{4}}{9.40\times10^{-4}}\)
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1) choose the best answer using the periodic table. what is the name of…
1. magnesium phosphide 2. tetraphosphorus pentasulfide 3. $\text{K}_3\text{N}$
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choose the best answer. which of these represents an atoms tendency to …
○ octet rule
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8. choose the best answer based on the lewis structure. what is the cen…
1. oxygen 2. $SiO_2$
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which is the correct lewis structure for phosphorus trichloride (pcl₃)?…
The first option: $\underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{Cl}}}-\underset{\cdot \cdot}{\text{P}}-\underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{Cl}}}$ (with 3 lone…
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12 choose the best answer based on the lewis structure. how many lone p…
11. C. VSEPR Theory 12. 2
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13. drag and drop the formulas with the chemical names. formulas: feo, …
- $\text{FeO}$: iron (II) oxide - $\text{Hg}_2\text{O}$: mercury (I) oxide - $\text{HgO}$: mercury (II) oxide - $\text{Fe}_2\text{O}_3$: iron (III) oxide
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contents of this page will be cut out and pasted to your notebook types…
To solve this worksheet on types of energy, we first recall the definitions and examples of each energy type: ### 1. Chemical Energy - **Description**: Energy stored in the bonds …
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we know that solids and liquids have very ______________ properties and…
1. different 2. pulled 3. tidal bulge 4. second
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science 30 unit d: energy and the environment harvesting chemical energ…
a. $\Delta H_{comb} = -1234.8\ \text{kJ/mol}$ b. $\Delta H_{comb} = -5756.2\ \text{kJ}$ (for the given balanced equation) or $-2878.1\ \text{kJ/mol of } C_4H_{10}$ c. $\Delta H_{c…
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7) drag and drop the molecular shapes with the lewis structures. choice…
- $\text{F-P-F (with one lone pair on P, three F atoms)}$: trigonal pyramidal - $\text{F-Be-F (with three lone pairs on each F)}$: linear - $\text{Cl-C-Cl (four Cl atoms around C)…
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substance - water - air - salt - argon gas - sea water - carbon dioxide…
| Pure Substance | | Mixture | |--|--|--| | **Element** | **Compound** | | | argon gas <br> graphite <br> gold bracelet <br> tin can | water <br> salt <br> carbon dioxide | air <b…
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6) drag and drop the molecular shapes with the images. choices: tetrahe…
1. Linear 2. Trigonal planar 3. Bent 4. Tetrahedral 5. Trigonal pyramidal
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4) choose the best answer. what is the cause of the various molecular s…
4) the electrostatic repulsion of valence electrons 5) lone pair of electrons on the central atom
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1) choose the best answer. the three - dimensional shape of atoms in a …
1) O molecular geometry 2) O VSEPR 3) - $\square$ the number of single, double, or triple bonds - $\square$ VSEPR theory - $\square$ Lewis structures
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math connections chemical properties and interactions name: date group:…
### Completed Data Table: | Object | Mass (g) | Volume (cm³) | Density (g/cm³) | |------------------|-----------|--------------|-----------------| | Vegetable Oil | 18.83 | 20.42 …
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geniuschallenge water cycle 1. the process of water changing from a liq…
1. freezing ### Question 2
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16. what is the name of this fuctional group? r—o—p(=o)(oh)(oh) (the st…
phosphate group
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9) use a periodic table to type in the correct answer for each blank. (…
C: 4 N: 3 O: 2 F: 1 Ne: 0
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7) choose the best answer. which of these represents a correctly drawn …
The fourth option (rightmost): $\text{O}-\text{N}(=\text{O})-\ddot{\text{O}}:$ (with three lone pairs on the single-bonded oxygens and two lone pairs on the double-bonded oxygen)
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12. name the functional group on this molecule amine group methane carb…
12. carboxyl group 13. fatty acid (carboxyl group)
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5) choose the best answer. how many lone pairs of electrons are present…
5) 2 6) nitrogen
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3) choose the best answer. which structure represents a correctly drawn…
3) $\boldsymbol{H—\ddot{N}—H}$ (with three H atoms, $\boldsymbol{\ce{H-\underset{\cdot \cdot}{\overset{H}{N}}-H}}$) 4) $\boldsymbol{0}$
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question 3 (1 point) the isotope americium-241 (used in smoke detectors…
1. neptunium-237 2. nitrogen-14
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after watching the video and performing any associated labs and/or expe…
1. 1) Color change; 2) Production of gas; 3) Change in energy (temperature change/light release); 4) Formation of a precipitate 2. Matter is anything that has mass and occupies sp…
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1) choose the best answer. a(n) ____ structure is a two - dimensional d…
1) C. Lewis 2) A. octet
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use the ideal gas law below to solve the following problems. pv = nrt w…
s (Key Results): 1. $\boldsymbol{0.122\ \text{mol}\ \text{O}_2}$ 2. $\boldsymbol{\approx 50.7\ \text{L}\ \text{N}_2}$ 3. $\boldsymbol{\approx 27.8\ \text{atm}}$ (corrected) 4. $\b…
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a certain liquid has a density of 0.732 g/ml. how many liters would wei…
\(1.37\space L\)
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question 7 (1 point) the energy change for a chemical reaction that inv…
Question 7: B. standard heat of formation Question 8: B. Chemical energy decreases and the total kinetic energy of the molecules increases.
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question 5 (1 point) a chemical change that involves a release of energ…
1. Question 5: C. exothermic change 2. Question 6: B. non-renewable
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part c. match the compound to the molar mass draw lines to match each c…
- \( \text{KBr} \) matches 119 g/mol (correct, mark √). - \( \text{Na}_2\text{SO}_4 \): Student’s 110.04 is incorrect (mark X), correct molar mass ≈ 142.05 g/mol. - \( \text{CaBr}…
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platelets 350,000/mm³ (350 × 10⁹/l) normal sodium 139 meq/l (139 mmol/l…
cardiogenic shock
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platelets: 350,000/mm³ (350 × 10⁹/l), normal; sodium: 139 meq/l (139 mm…
ischemia
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8 fill in the blank 7 points perform the following conversions. set up …
- start: \( 45.2\) - conversion #1 (g box): \( 1\) - conversion #2 (kg box numerator): \( 1\), conversion #2 (denominator unit, bottom row last blank): \( g\) - standard notation:…
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7 fill in the blank 5 points complete the sentences below using the cor…
1000 ### 2.
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d. if you have 80.0 grams of lye (naoh), how many moles would you have?…
d. 2.00 moles e. 1.00 moles f. 2.00 grams
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★ time and change 5. compare the graph \military deaths in world war i\…
### Question 5 (Ranking Casualty Figures) To solve this, we refer to typical World War I and US Civil War casualty data: - **Russia (WWI)**: ~1,700,000+ military deaths. - **Germa…
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the hydrogen peroxide in dental strips makes your teeth whiter. this st…
chemical property
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d. another way of writing the chemical formula of vinegar is ch₃cooh. u…
d. Acetic acid a. $\text{Na} + \text{H}_2\text{O} ightarrow \text{NaOH} + \text{H}_2$ b. $2\text{Na} + 2\text{H}_2\text{O} ightarrow 2\text{NaOH} + \text{H}_2$ c. $40.00\ \text{g/…
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limestone is a sedimentary rock ( like the one pictured below ) consist…
Carbonic acid in seawater forms puddles and caves on limestone
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which of the following examples shows a physical property of the given …
Option 3. Gold has high luster
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well done, you have proven that you know how to work in a lab. what do …
c) Take off your lab coat and wash your hands
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a sample liquid is cooled from 150°c to 30°c, causing the liquid to cha…
The correct option is the one stating "A physical change has occurred." (Assuming the option is labeled, for example, if it's the second option: B. A physical change has occurred.)
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precisely! there are usually two different types of fire extinguishers:…
a). CO₂ is freezing cold
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so let me ask you once again. what do you have to do if there is an une…
b) Evacuate
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part 3: subatomic structure of compounds vinegar has the chemical formu…
### Part a. | | Element name | How many are in the formula? | |---|---|---| | Element 1 | Carbon | 2 | | Element 2 | Hydrogen | 4 | | Element 3 | Oxygen | 2 | ### Part b. #### Ele…
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why didnt you just clean the spill with water? a) the acid reacts with …
a) The acid reacts with water
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what does the hazard symbol on the beaker mean? click the view image bu…
a) Corrosive
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returning all unused chemicals to their original containers is a good p…
False
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44. a mental disorder in which a person is overwhelmed by sad feelings …
c. Depression ### Question (Second disease - related, let's assume it's Q45)
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here is an image of the hazard symbol on the box. what does it mean? cl…
c) Explosive
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in the mixture of sand and water (dirty water), a clear water can be se…
filtering
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what does the following symbol mean? click the view image button to get…
b) Health hazard
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what does the following symbol mean? click the view image button to get…
a) Toxic
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which symbol depicts an oxidizing reagent? click the view image button …
d) Option D
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10. caffeine... caffeine... choose the correct molecular formula for ca…
\( \boldsymbol{C_8H_{10}N_4O_2} \) (the first option, e.g., A. \( C_8H_{10}N_4O_2 \) if options are labeled A, B, C, D)
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in a lab experiment, students were tasked to collect exactly 50 ml of s…
The third set of equipment (safety goggles, graduated cylinder, bunsen burner, iron ring, iron stand, wire gauze, evaporating dish, filter paper, funnel, balance, beaker, beaker t…
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13. pollution originating from a single, identifiable source, such as a…
False ### Question 14
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lets find out how much you know about this topic! this will help us per…
Closed-toe shoes that cover the entire foot.
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measurement topic 2: final exam collecting and interpreting data ____ l…
To determine the relationship between particle size, temperature, stirring, and the time it takes for sugar to dissolve in water (or to investigate factors affecting the rate of s…
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a compound has an empirical formula of \\(\\ce{ch2o}\\) (molar mass 30 …
\( \text{C}_6\text{H}_{12}\text{O}_6 \) (assuming it's one of the options, e.g., the fourth option as per the image)
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the phosphorus cycle differs from the biogeochemical cycles in that it …
A. It does not have an atmospheric reservoir.
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1. what is the main cause of nutrient pollution in chesapeake bay? a. o…
c. Excess nitrogen and phosphorus from agricultural runoff ### Question 2
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5. __h₂o₂ → __h₂o + __o₂ 6. __al + __cl₂ → __alcl₃ 7. __ag₂o → __ag + _…
9. $\boldsymbol{1\text{Ca} + 2\text{H}_2\text{O} ightarrow 1\text{Ca(OH)}_2 + 1\text{H}_2}$ 10. $\boldsymbol{1\text{SeCl}_6 + 1\text{O}_2 ightarrow 1\text{SeO}_2 + 3\text{Cl}_2}$ …
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which of the following is a fact of isomers? although molecularly bonde…
The option (first option, likely worded as "Although molecular formula... same empirical formula and the same molecular formula") that states ethanol and dimethyl ether have the s…
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2.3: create simple mathematical models to represent chemical concepts. …
\( 0.1 \) Units: pounds ### 3B Solution:
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what is the atomic number of the atom? neon 10 protons, 10 electrons, 1…
B. 10 (assuming the blue option with 10 is the correct choice, formatted as per multiple - choice instruction: B. 10)
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3a. text partially obscured, likely a math/science problem answer: unit…
6 ### 3D:
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metals (elements on the left side of the periodic table) become anions …
B. Cations (assuming the options are A. Anions, B. Cations)
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fluorine, which has 7 valence electrons, is going to... give up 7 elect…
Gain 1 electron
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nh₄⁺ hydroxide silicon ammonium sodium
ammonium (the option with "ammonium" text, likely the green - colored option in the image)