Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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11) choose the best answer. (see companion material, the periodical tab…
11. Co 12. Nd 13. 5
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9) choose the best answer. which sublevels are found in the 4th energy …
9. s, p, d, and f 10. a. 2 b. 8 c. 18 d. 32
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7) choose the best answer. how do you determine the number of energy le…
7. It is the same number as the period number. 8. 7
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3) choose the best answer using a periodic table. (see companion materi…
The third option (the structure with 7 dots around the Cl symbol: 2 dots top, 2 dots right, 2 dots bottom, 1 dot left)
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1) choose the best answer. elements in a group have similar properties …
1. valence electrons 2. It is the same number as the last digit of the group number.
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2 \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2F2(g) + O2(g) -> 2OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( 2 F_2(g) + O_2(g) ightarrow 2 OF_2(g) \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $\boldsymbol{2F_2(g) + O_2(g) ightarrow 2OF_2(g)}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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1. what are the four major sources of energy harnessed by engines? 2. e…
The four major sources of energy harnessed by engines are typically chemical energy (from fuels like gasoline, diesel, coal, etc.), thermal energy (heat, e.g., from steam), mechan…
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practice: 1. read the following scales. record the correct number of di…
First Thermometer: $45.7^\circ \text{C}$ Second Thermometer: $21.0^\circ \text{C}$ (or $21.05^\circ \text{C}$ if the divisions are 0.05, but likely 21.0) Third Thermometer: $100.1…
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crystals 6. what are crystals? crystals are solid materi arranged in a …
Crystals are solid materials in which atoms, molecules, or ions are arranged in a highly ordered, repeating three - dimensional lattice structure.
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what volume in liters of a 0.724 m nai solution contains 0.405 mol of n…
0.559 liters (Factor setup for the diagram: Starting amount: \( 0.405 \) mol NaI Multiplication factor: \( \frac{1\ \text{L}}{0.724\ \text{mol NaI}} \))
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determine the amount in grams of kcl that exists in 20.3 g of a solutio…
$0.231\ \text{g KCl}$ (The filled setup would be: Starting amount: $20.3$ $\text{g solution}$ Multiplied by $\frac{1.14\ \text{g KCl}}{100\ \text{g solution}}$)
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the purpose of an electric motor is to convert ______. choose 1 answer:…
A. electrical energy into kinetic energy
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how many grams of a solution that is 5.20 % sucrose by mass are needed …
346 g solution
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what is the molarity of potassium ions in a 0.122 m k₂cro₄ solution?
$0.244\ \text{M } K^+$
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here is the reaction you drew for protonation of methanol with an acid.…
1. Protonation of methanol first occurs: $CH_3OH + H^+ ightarrow CH_3OH_2^+$ 2. A second methanol molecule (as nucleophile) attacks the oxonium ion, leading to elimination of $H_2…
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5. which process is necessary to the formation of clouds? (options: war…
(Assuming the correct option is related to condensation, e.g., if options are A. evaporation, B. precipitation, C. condensation, D. transpiration, then) C. condensation ### Questi…
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in the boxes, draw the structures, including all bonds, lone pairs and …
Left box structure: ``` H | H - C - O:⁻ | H ``` (Plus a separate $\text{H}^+$; oxygen has 3 lone pairs, negative charge) Right box structure: ``` H | H - C⁺ - O - H | H ``` (Oxyge…
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which is a nonpoint source of pollution? ○ tourists throw trash into th…
C. Rain contains chemicals that seep into the ground.
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a particular antibiotic kills 99% of a bacterial population. what will …
## Part E Over time, the antibiotic will become less effective at killing the bacteria ## Part F The use of any chemical that kills bacteria can eventually lead to resistance to t…
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draw a skeletal (\line\) structure of this molecule: $\\ce{ch3 - c(=o) …
The skeletal (line) structure of the molecule is: ``` CH₃ | O | O ║ | ║ C - C - C - C - CH₃ | CH - CH₃ | CH₃ ``` (Or in a more compact and standard drawing: ``` CH3 | O | O || | |…
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how many different molecules are drawn below? (with molecular structure…
4
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6. the chemical weathering of feldspar produces ______. ○ quartz grains…
B. clay minerals
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5. the most important agent of chemical weathering is carbonic acid nit…
C. water
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how do wetlands help maintain good water quality? 1. 2. 3. 4. 5. 6. tru…
s (for the numbered list): 1. Trap sediments from runoff to improve clarity. 2. Absorb excess nutrients to prevent eutrophication. 3. Host microbes that break down organic polluta…
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which is an example of chemical weathering? a. explosives breaking apar…
C. acid rain changing granite into clay minerals and quartz grains
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molecular representation of a wildfire balanced chemical equation of a …
The balanced equation is \( \boldsymbol{\ce{C6H12O6 + 6O2 -> 6CO2 + 6H2O}} \) with coefficients 1, 6, 6, 6 (for \( \ce{C6H12O6} \), \( \ce{O2} \), \( \ce{CO2} \), \( \ce{H2O} \) r…
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instructions: draw and label the following structures on the next page:…
- Glucose: Draw 1 molecule (using the given structure). - Oxygen: Draw 6 \(O=O\) molecules. - Carbon Dioxide: Draw 6 \(O=C=O\) molecules. - Water: Draw 6 \(H-O-H\) molecules. - Ma…
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name alisson serrano pd. 4 date 1-16-26 wildfires final project - symbo…
\( \boldsymbol{1} \) \( \ce{C6H12O6} \) + \( \boldsymbol{6} \) \( \ce{O2} \) \( \boldsymbol{ ightarrow} \) \( \boldsymbol{6} \) \( \ce{CO2} \) + \( \boldsymbol{6} \) \( \ce{H2O} \)
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solve the problems. show your work and use significant figures. round a…
5) $\boldsymbol{9.17 \times 10^{21}}$ atoms 6) $\boldsymbol{1.67 \times 10^{23}}$ molecules
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3) what is the molar mass of na₂so₄? 4) what is the mass, in grams, of …
3) The molar mass of $\text{Na}_2\text{SO}_4$ is $142\ \text{g/mol}$ 4) The mass of 2.0 moles of $\text{CO}_2$ gas is $88\ \text{g}$
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solve the stoichiometry problems. show your work and use significant fi…
1) $32.10\ \text{g/mol}$ 2) $233.99\ \text{g/mol}$
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the molar mass of 1 mole of silver nitrate is 169.88 g/mol. step 4: div…
$\boldsymbol{6.02 \times 10^{23}}$ (Option B)
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3) choose the best answer. a student compared a mole of water (h₂o) mol…
- Both samples have the same number of hydrogen atoms. - Both samples have an equal number of molecules.
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1) choose the best answer. mole ratios are obtained from the ____ in a …
1. coefficients 2. amount of particles
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organic chemistry ii electrophilic aromatic substitution (synthesis of …
The multi-step synthesis of 4-nitrobenzoic acid from benzene is: 1. Friedel-Crafts alkylation of benzene to toluene 2. Nitration of toluene to p-nitrotoluene 3. Oxidation of p-nit…
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long answer questions q.1(ex. q. 1) what are carbohydrates? how are mon…
### Q.1: 1. **Carbohydrates**: Macromolecules defined as polyhydroxy aldehydes or ketones, with the general formula $\text{C}_n(\text{H}_2\text{O})_n$. They are classified into: -…
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how would the electron configuration of nitrogen change to make a stabl…
It would gain three electrons.
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how does rb bond with other elements? (1 point) ○ rb gains two electron…
C. Rb loses an electron.
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which of the following combination of elements is the most reactive? (1…
Cs and Br
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which feature is unique to group 18 nonmetals? (1 point) ○ they follow …
C. They are very nonreactive.
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how do nonmetals tend to form bonds? (1 point) by losing protons by gai…
C. by gaining electrons
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why does the reactivity of metals increase from right to left on the pe…
C. Metals on the right have more protons, causing valence electrons to be held more strongly.
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which statement describes the bonds in iron sulfate (feso₄)? (1 point) …
A. Fe and S are ionically bonded, while S and O are covalently bonded
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which statement best explains the difference between polar and nonpolar…
D. Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
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which option contains an example of a polyatomic ion? (1 point) ○ mgcl …
C. \( \text{KNO}_3 \)
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this image shows electronegativities of elements on the periodic table.…
A. fluorine (F)
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determine the quantity of hydrogen atoms in 0.1488 g of phosphoric acid…
$2.743 \times 10^{21}$ atoms H
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determine the quantity of atoms of vanadium in 1.28 grams of vanadium. …
$1.51 \times 10^{22}$ atoms of vanadium Filled setup for the tool: Starting amount: $1.28\ \text{g V}$ Conversion factor: $\frac{1\ \text{mol V}}{50.94\ \text{g V}} \times \frac{6…
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identifying health science careers what are examples of health science …
- Registered Nurse - Emergency Medical Technician - Dentist - Surgeon - Medical Assistant
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therford -career preparedness identifying science, technology, engineer…
Zoologist, Chemist, Robotics Engineer, and (assuming a fourth STEM - related, but from options, the three plus Robotics Engineer. So the four options to select are: B. Zoologist C…
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determine the quantity of moles of propylene (c₃h₆) in 25.0 g of the su…
$0.594\ \text{mol}\ \text{C}_3\text{H}_6$ (Note: Filling the interactive template: Starting amount: $25.0$, unit: $\text{g}\ \text{C}_3\text{H}_6$ Conversion factor numerator: $1$…
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question 14 of 26 determine the quantity of moles in 4.21×10²³ formula …
0.699 mol CaCl₂ ### Filled-in setup breakdown: Starting amount: $4.21 \times 10^{23}$ formula units CaCl₂ Conversion factor: $\frac{1 \, \text{mol CaCl}_2}{6.022 \times 10^{23} \,…
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determine the mass in grams of 1.6 × 10⁻³ mol glucose, c₆h₁₂o₆. the int…
$0.29\ \text{g}$ (For the interactive template: - Starting amount box: $1.6 \times 10^{-3}$ and $\text{mol } C_6H_{12}O_6$ - Conversion factor numerator: $180.18$ and $\text{g } C…
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question 13 of 26 determine the mass in grams of 1.6 × 10⁻³ mol glucose…
$0.29\ \text{g}\ \text{C}_6\text{H}_{12}\text{O}_6$ (Note: Filled into the structure: Starting amount box: $1.6 \times 10^{-3}\ \text{mol}\ \text{C}_6\text{H}_{12}\text{O}_6$ Frac…
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matching careers with clusters: part 3 match each job example with its …
Jake is a Flight Attendant. → Transportation and Logistics Israel is a Cashier. → Marketing, Sales, and Service Deb is a Video Game Designer. → Information Technology Rakhee is an…
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matching careers with clusters: part 3 match each job example with its …
Jake is a Flight Attendant. → Transportation and Logistics Israel is a Cashier. → Marketing, Sales, and Service Deb is a Video Game Designer. → Information Technology Rakhee is an…
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determine the mass, in grams, that are in 5.32 × 10²² molecules of co₂?…
$3.89 \text{ g CO}_2$ (The filled setup is: Starting amount: $5.32 \times 10^{22}$ molecules $\text{CO}_2$ Conversion factor: $\frac{1 \text{ mol CO}_2}{6.022 \times 10^{23} \text…
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what type of matter is shown in this particle diagram? options: element…
Mixture of Elements and Compounds
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question 12 (4 points) corrosive indicates: - that the material can deg…
That contact destroys living tissue as well as equipment
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general guidelines for preventing accidents include: know where the saf…
All of the above
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question 6 (4 points) saved the cas registry number is is usually fatal…
a unique identifying number for each chemical
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draw the lewis structure for ethylamine (c₂h₇n). ethylamine molecules h…
The Lewis structure of ethylamine (\( C_2H_7N \)) is \( \boldsymbol{\text{H}_3\text{C} - \text{CH}_2 - \text{NH}_2} \) with a lone pair (two non - bonding electrons) on the nitrog…
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a substance that helps maintain a constant ph is best described as sele…
a buffer
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a buffer should be able to stabilize ph select increase ph act as a neu…
stabilize pH
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question 4 5 pts a solution has a ph of 4 before a buffer is added. the…
remain the same
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which process is defined as breaking down rocks into smaller pieces wit…
D. mechanical weathering
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adding select select to a solution will decrease the ph. select neutral…
hydrogen ions
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which is a common use of minerals? ○ pasta ○ toothpaste ○ applesauce ○ …
B. toothpaste
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which process is responsible for changing the composition of rock? ○ er…
chemical weathering
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this is mohs hardness scale. | mineral | hardness | |-----------|------…
corundum, quartz, calcite, gypsum
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predicting human impact on freshwater sources page 1 page 2 acid rain i…
- produce energy using water power - use electricity or energy-saving products - create technology to capture sulfur dioxide
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how do acids and bases affect the quality of freshwater sources? ○ acid…
Acids lower the pH of freshwater and bases raise the pH of freshwater.
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exercice n°8 on dissout 120cm³ de gaz hcl dans une quantité d’eau disti…
Désolé, le texte fourni n'est pas valide. Veuillez fournir plus de détails ou clarifier votre question afin que je puisse vous aider mieux.
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physique chimie 3ème 1) écrire l’équation bilan de la réaction qui s’es…
Désolé, le texte fourni n'est pas valide. Il manque des informations essentielles (comme la nature du gaz, sa masse, les conditions de la réaction...) pour répondre aux questions.…
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what are the coefficients, reading left to right, when the chemical equ…
1, 3, 1, 3
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drag an oval over the format below that symbolizes these formulas: (mol…
$3\text{CH}_2\text{O}$ (the middle option)
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solve the problems. show your work and use significant figures. round a…
5) $\boldsymbol{9.17 \times 10^{21}}$ atoms 6) $\boldsymbol{1.67 \times 10^{23}}$ molecules
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3) what is the molar mass of na₂so₄? 4) what is the mass, in grams, of …
3) The molar mass of $\text{Na}_2\text{SO}_4$ is $142\ \text{g/mol}$ 4) The mass of 2.0 moles of $\text{CO}_2$ gas is $88\ \text{g}$
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solve the stoichiometry problems. show your work and use significant fi…
1) $32.10\ \text{g/mol}$ 2) $233.99\ \text{g/mol}$
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the molar mass of 1 mole of silver nitrate is 169.88 g/mol. step 4: div…
$\boldsymbol{6.02 \times 10^{23}}$ (Option B)
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3) choose the best answer. a student compared a mole of water (h₂o) mol…
- Both samples have the same number of hydrogen atoms. - Both samples have an equal number of molecules.
-
1) choose the best answer. mole ratios are obtained from the ____ in a …
1. coefficients 2. amount of particles
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organic chemistry ii electrophilic aromatic substitution (synthesis of …
The multi-step synthesis of 4-nitrobenzoic acid from benzene is: 1. Friedel-Crafts alkylation of benzene to toluene 2. Nitration of toluene to p-nitrotoluene 3. Oxidation of p-nit…
-
long answer questions q.1(ex. q. 1) what are carbohydrates? how are mon…
### Q.1: 1. **Carbohydrates**: Macromolecules defined as polyhydroxy aldehydes or ketones, with the general formula $\text{C}_n(\text{H}_2\text{O})_n$. They are classified into: -…
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how would the electron configuration of nitrogen change to make a stabl…
It would gain three electrons.
-
how does rb bond with other elements? (1 point) ○ rb gains two electron…
C. Rb loses an electron.
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which of the following combination of elements is the most reactive? (1…
Cs and Br
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which feature is unique to group 18 nonmetals? (1 point) ○ they follow …
C. They are very nonreactive.
-
how do nonmetals tend to form bonds? (1 point) by losing protons by gai…
C. by gaining electrons
-
why does the reactivity of metals increase from right to left on the pe…
C. Metals on the right have more protons, causing valence electrons to be held more strongly.
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which statement describes the bonds in iron sulfate (feso₄)? (1 point) …
A. Fe and S are ionically bonded, while S and O are covalently bonded
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which statement best explains the difference between polar and nonpolar…
D. Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
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which option contains an example of a polyatomic ion? (1 point) ○ mgcl …
C. \( \text{KNO}_3 \)