Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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a mixture of 0.220 moles co, 0.350 moles h₂, and 0.640 moles he has a t…
0.865 bar
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which of these elements has the smallest number of protons? tungsten te…
Molybdenum
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which government agency would most likely be responsible for investigat…
A. U.S. Securities and Exchange Commission ### Second Question (Life Insurance)
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question 1 (10 points) rank the following in order of decreasing rate o…
CO > F₂ > Kr > SF₆
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what is the very smallest piece of magnesium possible? a magnesium oxid…
a magnesium atom
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the number in each square of the periodic table tells us the atomic num…
B. Argon (Ar)
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38 which gas causes quick breads to rise? a carbon b carbon oxide c car…
C. Carbon Dioxide
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37 leavening agents are products that cause baked goods to rise. a fals…
B. True
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which of these chemical formulas - kcl, xe, co₂, h₂ - represents both a…
$\text{H}_2$
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question 8 which class of elements is most likely a gas at room tempera…
nonmetals
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question 7 which of the following elements is the most electronegative?…
chlorine
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in which group of the periodic table do you find inert gases? 1a 8a 7a …
8A
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which of the following correctly describes the subatomic particles in t…
20 protons, 20 electrons, 24 neutrons
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is this sentence in active voice or passive voice? in 1949, the u.s. fo…
active voice
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question 1 what type of chemist studies how living things get energy fr…
biochemist
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kenny, a chemist at a chemical supply company, needs 500 gallons of sol…
100 gallons of \( 14\%\) acetone solution 400 gallons of \( 9\%\) acetone solution
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covalent bonding covalent bonding occurs when two or more nonmetals sha…
The correct bond representations (considering bond type and connectivity) are for \(H_2\) (\(H - H\)), \(O_2\) (\(O = O\)), \(CO_2\) (\(O = C = O\)) and \(H_2O\) (correct connecti…
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during a college chemistry experiment, students must prepare 33 fluid o…
23.1 fluid ounces of \(2\%\) solution 9.9 fluid ounces of \(12\%\) solution
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24 baking soda reacts twice in the oven. a true b false
B. False
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a landscaping company mixes its own proprietary blend of topsoil that c…
\(2\)
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read the passage and then answer the question. a 2015 study by nasa sci…
a variant of an element with a different number of neutrons
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13 leavening agents used in quick breads include baking soda and baking…
A. True
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what is done with excess carbon dioxide after it is captured? after it …
The correct option is: Once captured, the $\ce{CO_2}$ is compressed and then transported to a safe and permanent storage location.
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changing your toilet can reduce water pollution because a. the sewage i…
d. more efficient plumbing uses less water and creates smaller volumes of waste
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8 baking powder needs an acidic ingredient to react. a false b true
A. False
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6 what does baking powder consist of? a baking soda and cream of tartar…
A. Baking Soda and cream of tartar
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8. look at the equation and identify the kind of reaction it represents…
A. synthesis ### Question 9
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question 1-10 what material type does the scientific theory of atoms id…
an element (the option with "an element" text, corresponding to the third option in the list as per the image layout: the third circular option labeled "an element")
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1. list some of the properties of covalent compounds.
Some properties of covalent compounds: 1. Low melting and boiling points (weak intermolecular forces). 2. Poor electrical conductivity (no free ions/electrons to conduct). 3. Ofte…
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a dream within a dream edgar allan poe take this kiss upon the brow! an…
A. Poe uses the sea shore and grains of sand ### Question 5
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6 multiple choice 1 point what forms a sigma (σ) bond? ○ sideways overl…
C. Direct overlap of orbitals along the axis between nuclei ### Question 7:
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the chemical reaction of propane is shown below: c₃h₈ + 5 o₂ → 3 co₂ + …
The best evidence is the formation of new substances (carbon dioxide, water) and the release of heat and light. The reactants (propane, oxygen gas) have different chemical identit…
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3 multiple choice 1 point the lines in a lewis structure represent: pro…
C. Bonding pairs of electrons ### Question 4
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4. what is the total number of moles of hydrogen gas contained in $9.03…
1.50 moles (the option with "1.50 moles")
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3. how many molecules are in 0.25 mole of o₂? options: 1.5 × 10²³ 3.0 ×…
\( 1.5\times10^{23} \) (the first option: \( 1.5\times10^{23} \))
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the following statements is supported by the given on the right. a chem…
(Assuming the last option is the correct one, for example, if the options are labeled and the correct one is like E. A chemical reaction did not occur because Reactant 1 and Produ…
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2. what is the total number of molecules of so₂ in a 0.10 - mole sample…
\( 6.0 \times 10^{22} \) (the option with this value, e.g., if the options are as given, the second option: \( 6.0 \times 10^{22} \))
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1. which sample contains a total of $9.0 \\times 10^{23}$ atoms? \\bigc…
1.5 moles of Cu
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1 multiple choice 1 point covalent bonds typically form between which t…
C. Two nonmetals ### Question 2
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1: gas sample diagram on the right shows a model of a sample of gas par…
Thermal energy is being added, increasing the particle motion
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do now october 27 & 28, 2025 when comparing two solutions side by side,…
Hypotonic
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use the diagram to answer each question. atoms of some common elements …
23 ### Question 23: What is the total number of electrons in an atom of sodium?
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12) ___ na + ___ h₂o → ___ naoh + ___h₂ 13) ___ ag₂o → ___ ag + ___o₂ 1…
12. \(2Na + 2H_2O = 2NaOH + H_2\) 13. \(2Ag_2O = 4Ag + O_2\) 14. \(S_8 + 12O_2 = 8SO_3\) 15. \(6CO_2 + 6H_2O = C_6H_{12}O_6 + 6O_2\) 16. \(K + MgBr = KBr + Mg\) 17. \(2HCl + CaCO_…
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an element with mass 140 grams decays by 21.6% per minute. how much of …
\boxed{1.1}
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26) water is always a product in what type of reaction? 27) what are th…
Water is always a product in a **combustion reaction** (specifically, hydrocarbon combustion, where hydrocarbons react with oxygen).
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essential aks review for test 3: bonding bond properties | | ionic | po…
| Bond Properties | Ionic | Polar | Nonpolar | |-----------------------|--------------------------------|--------------------------------|---------------------------------| | Type…
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drag and drop the labels to complete the formula and the equation for d…
Formula: Top box (density) = Middle box (mass) / Bottom box (volume) Equation: Box = 3.33 g/ml (since $\frac{10g}{3ml} \approx 3.33g/ml$) So labels: Formula: density = mass / volu…
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26) water is always a product in what type of reaction? 27) what are th…
Acid - base neutralization reaction (or Neutralization reaction, or also, sometimes, combustion of hydrocarbons produces water but not always "always" in the reaction type sense, …
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5 sentences to this assignment 1) go make snow cream!! then write 5 com…
1. Making snow cream involves mixing snow with ingredients like milk and sugar, which is a physical reaction because no new substances are formed at the molecular level. 2. The pr…
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given the reactions below, identify them as synthesis, decomposition, s…
Double Replacement ### Problem 15
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name period types of reactions worksheet given the reactions below, ide…
(for each part, e.g., 1): 1) \( 2\text{K} + \text{Cl}_2 ightarrow 2\text{KCl} \), Type: Synthesis (S) 2) \( 2\text{NH}_3 ightarrow \text{N}_2 + 3\text{H}_2 \), Type: Decomposition…
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image analysis: notice & wonder what do you notice? the 4 main types of…
## What do you notice? - Synthesis: Reactants \( A + B \), Product \( AB \) (combination). - Decomposition: Reactant \( AB \), Products \( A + B \) (breakdown). - Single Replaceme…
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pure substance or mixture results substance | description | sample gent…
D. Substance 4 is a mixture because the liquid evaporates and leaves small blue crystals behind.
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7 which of the following statements explains why oxygen is classified a…
D. Oxygen contains only one type of atom, but air contains several types of atoms.
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6 gold jewelry can be made in different colors. the difference in color…
D. 24K Gold
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bonding occurs when a metal transfers one or more electrons to a nonmet…
1. $\text{KF}$ (Lewis: $\text{K}^+ :\text{F}^-$) 2. $\text{MgI}_2$ (Lewis: $\text{Mg}^{2+} 2\text{I}^-$) 3. $\text{BeS}$ (Lewis: $\text{Be}^{2+} \text{S}^{2-}$) 4. $\text{Na}_2\te…
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describe how temperature and concentration affect the rate of a chemica…
For "I think...": Temperature increases reaction rate as particles collide more often and with more energy. Concentration increases rate due to more frequent collisions. For "My p…
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what does cleaning water before we use it and after we use it require? …
A. chemicals and energy
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electrons are negative and can move, while protons are positive and sta…
TRUE
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boleto de salida: vitamina another name for sodium is: hemoglobin table…
B. table salt (suponiendo que la opción "table salt" tenga el identificador B; si los identificadores no están dados, la respuesta es "table salt")
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which gas makes up the largest percentage of earth’s atmosphere by volu…
Nitrogen (the option labeled "Nitrogen")
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predict the product in the synthesis reaction below al (s) + n₂ (g) → _…
5. AlN
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predict the product in the synthesis reaction below: au (s) + n₂ (g) → …
5. AuN
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an increase in temperature will usually cause the rate of a chemical re…
3. increase.
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when magnesium reacts with aluminum chloride, the products are 1. mg + …
7. $\ce{3MgCl_2 + 2Al}$
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a chemical bond is formed when electrons are 1 lost 2 shared 3 all of t…
3. All of these
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any substance that enters into a chemical reaction is called a 1. produ…
3. reactant
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consider the reaction al₂(so₄)₃ + cacl₂ → alcl₃ + caso₄ when balanced u…
8. 9
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classify the following reaction: c₄h₁₀ + o₂ → co₂ + h₂o 1. single repla…
5. Combustion
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consider the reaction na + hcl → nacl + h₂ when balanced using the smal…
6. 7
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consider the reaction ccl₄ + o₂ → co₂ + cl₂ when balanced using the sma…
4 5
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15) a certain alcohol contains only three elements, carbon, hydrogen, a…
A) \( \text{C}_2\text{H}_6\text{O} \) ### Question 16
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10) determine the molecular formula of a compound that is 49.48% carbon…
C. $C_8H_{10}N_4O_2$ ### Question 11
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5) write the formula for copper (ii) sulfate pentahydrate. a) cu₂so₃·h₅…
E) \(CuSO_4 \cdot 5H_2O\) ### Question 6
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1) silver has an atomic mass of 107.868 amu. the ag-109 isotope (108.90…
C) 106.903 amu ### Problem 2
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question 8 12.5 pts if a sample tested had an r_f value of zero, what d…
It was not attracted to the mobile phase.
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question 7 12.5 pts the -oh groups in the silica-gel are most attracted…
C. polar
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question 4 12.5 pts what would happen to the rf values if the solvents …
The \( R_f \) values would be increased. ### Question 5
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question 2 12.5 pts remember that \like dissolves like\ while examining…
The -NH amine groups ### Question 3
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question 1 12.5 pts which of the following statements about the station…
O I and IV
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monthly payment scheme in company y the above graph shows the payment s…
C. \( P = 0.1S + 1.4 \)
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try again your answer is incorrect. read the descriptions below of two …
pure substance #### Sample B:
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what energy changes have occurred in the environment as a result of hum…
Environmental energy changes from human activity include: - **Fossil fuel use**: Chemical energy → thermal energy (heat) + greenhouse gas emissions (altering atmospheric energy ba…
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28. what type of bond exist between a sulfur and hydrogen atom? (1 poin…
A. Polar covalent ### Question 29
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27. what type of bond exist between a hydrogen and an oxygen atom? (1 p…
A. Polar covalent
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26. arrange the bonds in order of least to greatest polar character (1 …
\(C - Br\), \(C - Cl\), \(C - O\), \(Ge - O\), \(Si - F\) ### Question 27
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25. what is the bond angle of a trigonal planar molecule? (1 point) * 1…
D. 120.0 (assuming the options are labeled A to F with D being 120.0; if the original options have different labels, adjust accordingly. Based on the given list, the option with 1…
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24. what is the bond angle of a trigonal pyramidal molecule? (1 point) …
B. 107 (assuming the second option is labeled as B, with the text "107")
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23. what is the bond angle of a tetrahedral molecule? (1 point) * 109.5…
A. 109.5
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22. what is the bond angle of a linear molecule? (1 point) * 109.5 107 …
180 (the option with "180")
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20. predict the molecular shape of h2s (1 point) * linear bent trigonal…
B. Bent ### Question 21:
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18. predict the molecular shape of ch3br (1 point) * linear bent trigon…
E. Tetrahedral ### Question 19 (Predict the molecular shape of \( \text{NCl}_3 \))
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16. predict the molecular shape of cf2cl2 (1 point) * linear bent trigo…
Tetrahedral (the option "Tetrahedral") ### Question 17:
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current attempt in progress carbon monoxide is a gas at 0 °c and a pres…
\( \approx 1.73\ kg/m^3 \) (or more precise \( 1.726\ kg/m^3 \))
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14. predict the molecular shape of cos (1 point) * linear bent trigonal…
A. Linear ### Question 15 (PH₃ Molecular Shape)
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current attempt in progress a mixture of ethyl alcohol (molecular mass …
10.7 (approximate, or more precise 10.66) grams
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10. name n2f4 (1 point) * enter your answer 11. name co2 (1 point) * en…
dinitrogen tetrafluoride ### Question 11 (CO₂ Naming)
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5. give the number of valence electrons in nitrogen (1 point) * enter y…
5 ### Question 6
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3. an ionic bond would form between which pairs of elements? (1 point) …
atomic number 8 and atomic number 12 ### Question 4
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1. which of the following describes a covalent bond? (1 point) * the ne…
The option: "The nucleus of one atom attracts the electrons of the other atom, and they share one or more pairs of electrons." ### Question 2