Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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jovanni covalent bonding - problems give the name for the covalent form…
Carbon tetrachloride
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question 2 of 10 how does one recognize a redox reaction? a. by the pre…
B. By changes in the oxidation states
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question 1 of 10 what are the oxidation states of the atoms in a diatom…
A. The oxidation states are always 0 for both atoms.
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additional practice write chemical equations for each of the following …
4. $\text{FeCl}_3(aq) + 3\text{NaOH}(aq) ightarrow \text{Fe(OH)}_3(s) + 3\text{NaCl}(aq)$ 5. $\text{CS}_2(l) + 3\text{O}_2(g) ightarrow \text{CO}_2(g) + 2\text{SO}_2(g)$ 6. $\text…
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how many electrons are the atoms pictured below sharing? 0 2 4 6 cant b…
4
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how many $\\sigma$ and $\\pi$ bonds are in this molecule? molecular str…
9
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7 why do gas molecules escape from the exosphere, but not other layers …
A. It is the layer farthest from Earth, so there is less gravitational force ### Question 8
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1. analyze the problem you are given the reactants and products in a ch…
2NaOH (aq) + CaBr₂ (aq) → Ca(OH)₂ (s) + 2NaBr (aq)
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in part a, we saw that the theoretical yield of aluminum oxide is 1.00 …
78.0%
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what is the theoretical yield of aluminum oxide if 2.00 mol of aluminum…
1.00 mol
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what is a requirement for storing chemicals? a. chemical containers sho…
a. Chemical containers should be clearly labeled
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the drawing below shows a mixture of molecules: image of molecules key:…
# Explanation: ## Step1: Identify Molecules From the key: black = C, white = H, red = O. The molecules: \( \text{CH}_4 \) (black + 4 white) and \( \text{O}_2 \) (two reds). Count:…
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a food worker has finished cutting raw chicken and is about to chop veg…
a. Wash hands and change gloves
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the drawing below shows a mixture of molecules: suppose the following c…
Most initial moles: \(\text{C}\) Least initial moles: \(\text{O}_2\) Limiting reactant: (If we consider the stoichiometric ratio, but maybe the intended answer is \(\text{C}\) or …
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a sample of an aqueous solution of two substances r and p is sketched b…
# Explanation: ## Step1: Count Initial Molecules First, count the initial number of R and P molecules from the sketch. R (pink) molecules: let's count. In the box, R has 5? Wait, …
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an incorrect answer wouldnt break your streak. combustion is another wo…
C. burning
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chemicals that are used to diminish or terminate hallucinations, delusi…
B. antipsychotic drugs
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the atomic arrangements of two substances (a and b) are shown in the di…
The correct option is: Substance B is a compound as the atoms can be separated only by chemical processes (the third checkbox option, assuming the options are ordered as given: fi…
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four molecule models are shown. model 1 model 2 model 3 model 4 which m…
oxygen gas, represented by the chemical formula \( O_2 \)
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a teacher drew 3 figures on the board. figure 1 figure 2 figure 3 which…
Figure 1: Element Figure 2: Compound Figure 3: Mixture (the first option in the list)
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two elements (a and b) are combined in two different ways to form two d…
B. Substance X is a mixture, and Substance Y is a compound.
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a student receives a beaker that contains sand, water, and salt mixed t…
The beaker originally contains a heterogeneous mixture, and after Step 1, it contains a homogenous mixture
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a teacher asks her students to classify the substances listed in the ta…
B. The student’s claim is correct because the atoms in the substances are chemically combined to form a compound.
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a student studies two different atom arrangements. arrangement 1 arrang…
B. Arrangements 1 and 2 are elements; elements are made of atoms or molecules composed of the same kind of atoms.
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derek and his friends were looking at tiny crystals of salt with a magn…
Portia
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question 10 10 pts sucrose (c₁₂h₂₂o₁₁) dissolves easily in water (h₂o) …
D. Sucrose and water are both compounds because both substances are made up of more than one type of atom.
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view all material from unit 5 before taking this assessment as you will…
Illegal drugs, Illicit drugs
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a researcher heats substance 1 over a flame. the procedure produces a v…
A. Substance 2 is a pure substance that was separated from a mixture because of its large particle size
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draw the lewis dot diagram for a neutral atom of ge.
The Lewis dot diagram for Ge (neutral) has the symbol "Ge" with 4 valence electrons (dots) around it, e.g., $\ddot{ \text{Ge}} \ddot{}$ (or distributed as one on each side: $\dot{…
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when chemical w is added to a liquid, the chemical breaks down into sub…
B. Substances X, Y, and Z are elements
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33. halogens are in family 17. they have _7_ valence electrons. 34. hal…
8 ### Question 37
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draw the lewis dot diagram for a f⁻ anion.
The Lewis dot diagram for \( \boldsymbol{F^-} \) is a fluorine symbol (\( F \)) surrounded by 8 dots (4 electron pairs) within brackets, with a negative charge outside: \(\boldsym…
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draw the lewis dot diagram for a neutral atom of he.
The Lewis dot diagram for neutral He is represented with the helium symbol "He" and two dots (valence electrons) around it, like \(\boldsymbol{\text{He}:}\) (using the two - dot s…
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34. halogens react easily with elements in family 1 like ______ 35. whe…
sodium (or lithium, potassium, etc. - alkali metals) ### Question 35
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te for advanced students: in some sketches the distance between particl…
The correct classifications are gas, mixture, and heterogeneous mixture (as checked in the given options: gas, mixture, heterogeneous mixture are correctly selected based on parti…
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te for advanced students: in some sketches the distance between particl…
The correct classifications are: - gas (checked) - mixture (should be checked) - heterogeneous mixture (should be checked) Wait, but the question is about the classification – may…
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te for advanced students: in some sketches the distance between particl…
- gas (checked) - element (checked) - pure substance (checked)
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Question was provided via image upload.
The correct classifications (in addition to liquid) are: - compound (check the "compound" box) - pure substance (check the "pure substance" box) (Note: The existing "liquid" is co…
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22. malleable means that metals can be hammered into _______________. 2…
22. sheets 23. electricity 24. outermost 25. react 26. heat 27. about 78% 28. 5, 6, 7; gain 29. reactive 30. Helium 31. stair - step 32. non - metals; non - metals 33. 7
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ht-hand side that are correct for this substance. note for advanced stu…
- liquid - compound (if applicable, e.g., water) - pure substance (Note: The exact classification depends on the substance, but the liquid state is clear. For a common liquid like…
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14. alkali metals can be very ________ with oxygen or water. 15. elemen…
14. reactive 15. valence 16. metals 17. valence electrons 18. electrons (or multiple electrons) 19. most (or a specific number like 80+; historically, "over 80" or "the majority")…
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multiple choice question the active part of the penicillin structure is…
B. beta - lactam
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if the wrong word is used below, change it. if there is no error, click…
Belle Bottom offered the chemists a coupon for a free steak, but they're all vegetarians.
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if the wrong word is used below, change it. if there is no error, click…
Belle Bottom offered the chemists a coupon for a free steak, but they all vegetarians.
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match each form of energy with its correct description. chemical therma…
- chemical: involving energy stored in chemical bonds - thermal: involving the motion of atoms - electrical: involving electrical charges - mechanical: involving the position and …
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checkup (2\\frac{1}{2} points each answer) my score ______ match the fo…
Chemistry (subfield of Natural Science)
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part 3 of 3 find the mass of 23 molecules so₂. answer in units of g. an…
8. $2.44437 \times 10^{-21}$
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number in order the steps in the ionization of an acid in water. __ (66…
### Acid Ionization Order: (66): 2, (67): 4, (68): 1, (69): 3 ### Scientist - Contribution Matches: (70): b, (71): g, (72): a, (73): h, (74): e, (75): f, (76): d, (77): c ### Reac…
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dec. 2 thermal energy day 1 notes practice temperature measures the ___…
B. Kinetic energy (assuming the second option is labeled B; if the original labels were different, adjust the identifier but the text is "Kinetic energy")
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part 2 of 3 find the mass of $2.11 \\times 10^{23}$ molecules $\\ce{h2s…
4. 11.913
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a gas mixture contains co, ar and h₂. what is the total pressure of the…
1.37 atm
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dec. 2 thermal energy day 1 notes practice thermal energy is the kineti…
B. Atoms or molecules
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what is another name for thermal energy? thermal energy thermal energy …
B. Heat energy (assuming the options are labeled with letters, and "Heat energy" is the correct one. If the options were presented as: A. Potential energy, B. Heat energy, C. Elec…
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part 1 of 3 find the mass of 2.99 mol cl₂. answer in units of g. answer…
8. 212.29
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which energy transfer typically occurs in a microwave? thermal energy t…
electric energy to thermal energy
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what element is this? neon (ne) oxygen (o) nitrogen (n) fluorine (f)
Oxygen (O)
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what element is this? neon (ne) oxygen (o) nitrogen (n) fluorine (f)
Oxygen (O)
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what element is this? argon (ar) chlorine (cl) potassium (k) oxygen
Argon (Ar)
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what element is this? boron (b) beryllium (be) lithium (li) carbon (c)
Lithium (Li)
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which particle model best represents this scenario? aps hci aniline hci…
The upper particle model (the first box with more connected/clustered particles)
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generally, to carry a handgun in public in texas without an ltc, a pers…
ALL OF THE ABOVE ANSWERS ARE CORRECT (A-E)
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q5 match each term to the correct definition by writing the letter of t…
1. B 2. D 3. C 4. A
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q2 the toxic chemicals in some products can be dangerous if inhaled or …
Poisonous
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match each term with the best description. - compound - element - heter…
- Mixture that is completely uniform: Homogeneous - Individual unit formed from the sharing of electrons: Molecule - Simplest type of substance: Element - Mixture made of physical…
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3. complete the following equations and label the first reactant as eit…
a) \(HCl_{(aq)}+H_2O_{(l)} ightarrow H_3O^+_{(aq)} + Cl^-_{(aq)}\), \(HCl\) is an acid. b) \(CO_3^{2 - }_{(aq)}+H_2O_{(l)} ightleftharpoons HCO_3^-_{(aq)}+OH^-_{(aq)}\), \(CO_3^{2…
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a sample of gas has a volume of 3.40 l at 10.0°c. what will be its volu…
First question: C. 4.48 L Second question: C. 1286 ml
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a sample of gas has a volume of 200. ml at 20.0°c. what will be its vol…
D. 214 ml
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how many moles of helium are in a 2 liter gas sample at 2 atm and 100 c…
B. 0.13
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a 4.00 l sample of a gas is at a pressure of 2.00 atm. if the temperatu…
16.0 L
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4. pockets of ice on the moon are evidence of which of the following? t…
that collisions occurred with meteors and comets
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3. complete the following equations and label the first reactant as eit…
\( \text{HCl}_{(aq)} + \text{H}_2\text{O}_{(l)} ightarrow \text{H}_3\text{O}^+_{(aq)} + \text{Cl}^-_{(aq)} \); First reactant (HCl) is an acid. ### Part 3b:
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43 sep interpret data suppose you added some solid potassium nitrate (k…
- For added \( \text{KNO}_3 \): At \( 20^\circ\text{C} \), it remains undissolved (saturated solution); when warmed to \( 40^\circ\text{C} \), it dissolves (due to increased solub…
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42 ccc patterns compare the concepts of saturated solution and vapor pr…
### Similarities: 1. Both involve dynamic equilibrium (dissolving/crystallizing for saturated solution; evaporating/condensing for vapor pressure). 2. Both are temperature - depen…
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which is a sentence fragment? two hydrogen atoms and one oxygen atom co…
My parents’ business flourishing, thanks to online advertising.
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use the information in the table to answer the question. which country …
A. Israel
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use the information in the table to answer the question. which country …
B. Saudi Arabia
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use the information in the table to answer the question. which country …
A. Israel
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fractions word problem involving addition or subtraction of fractions w…
$\frac{5}{8}$
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balancing equations balance the following chemical equations. 1. \t____…
s (Coefficients): 1. \( \boldsymbol{1\ CH_4 + 2\ O_2 ightarrow 1\ CO_2 + 2\ H_2O} \) (Correcting the 3 to 2 for H balance) 2. \( \boldsymbol{1\ Na^+ + 1\ Cl^- ightarrow 1\ NaCl} \…
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Question was provided via image upload.
$\text{Ar} \cdot\cdot\cdot\cdot \cdot\cdot\cdot\cdot$ (8 dots, 2 on each of the four sides) #### b. Calcium
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do now - 12/13/25 what are valence electrons? why are they so important?
Valence electrons are the electrons in an atom's outermost shell. They are important as they determine an atom's chemical reactivity, bonding behavior, and participation in chemic…
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balancing equations balance the following chemical equations. 1. fe + h…
1, 1, 1, 2 (coefficients for SeCl₄, O₂, SeO₂, Cl₂ respectively)
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valence electrons, pages 194-195 1. what are valence electrons? 2. the …
1. Valence electrons are the electrons in the outermost energy level of an atom. 2. Chemical properties; chemical bonding 3. True 4. An electron dot structure is a diagram showing…
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¿cómo sabes cuántos electrones totales hay en un átomo?
El número total de electrones en un átomo neutro es igual al número atómico (Z) del elemento, ya que en un átomo neutro, el número de electrones (carga negativa) es igual al númer…
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the table below records observations made when investigating interactio…
10. A and B, A and C, B and D 11. B. Burning wood, C. Firework exploding
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referring to the figures below, answer question 7 and question 8 a. mol…
a. Figure A
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referring to the figures below, answer question 4 and question 5. a b c…
4. a. Figure A, d. Figure D 5. b. Figure B represents a compound because it contains molecules that are the same and that are made up of 2 different atoms.
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a 9.00 l tank at 28.8 °c is filled with 4.37 g of sulfur hexafluoride g…
sulfur hexafluoride mole fraction: 0.622 sulfur hexafluoride partial pressure: 0.0821 atm chlorine pentafluoride mole fraction: 0.378 chlorine pentafluoride partial pressure: 0.04…
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1. ¿qué nos dice el orden de los orbitales en una configuración electró…
El orden de los orbitales en una configuración electrónica nos dice que los electrones ocupan los orbitales de menor energía primero.
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function c takes time for its input and gives a students monday class f…
1. \(C(10:00)=\text{English}\) 2. At \(11:15\), the student has chemistry class.
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if an atom has 7 protons and 7 electrons what charge will it have? -2 +…
\(0\)
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14/53 what is the name for an ion with a negative charge? anion onion u…
anion
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a ______ is a charged particle because it has more or fewer electrons t…
B. ion, loses, gains
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11/53 match the following property with the correct bond: a bond betwee…
Covalent
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how many valence electrons in this structure? (with a lewis dot structu…
7
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9/53 if an atom loses two electrons what charge will it have? +2 +1 -1 …
+2
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8/53 electrons shared in a molecule are held ______ to the atoms with t…
more closely
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7/53 what kind of bond forms when atoms share electrons? artificial uni…
covalent
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use the chart to determine if the following compound forms an ionic, po…
Non - Polar Covalent
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5/53 predict the bond that will form between se and cl. ionic covalent
Covalent