Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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an atom has a charge of 1+. if the atoms nucleus contains 23 protons, t…
A. 22 electrons
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the diagram below represents a stable, uncharged lithium atom. it shows…
The diagram with 3 protons and 2 electrons shows a lithium ion. (Since the diagrams are not labeled, you would need to visually identify the one with 3 protons and 2 electrons amo…
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at one time, scientists thought that electrons orbited an atoms nucleus…
C. a region in which an electron will probably be
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which of the following is not a valid set of quantum numbers? n = 3, l …
The set $n = 3,l = 3,m = 3$ is not a valid set of quantum - numbers. The correct possible values of $l$ for $n = 4$ are $0,1,2,3$.
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14 - 18. a - e in order from most dense to least dense based on the fac…
B, A, E, D, C
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which type of emr is often used to very efficiently vibrate water molec…
microwaves
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identify the stages of injury and inflammation. injury inflammation inj…
A. Tissue injury resulting in the release of chemical signals B. Dilation and increased leakiness C. Phagocytosis and platelet - mediated clotting for repair
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maxim the only maxim i need to know is to treat others as i want to be …
The only maxim I need to know is to treat others as I want to be treated. We try to remember the maxim that "actions speak louder than words."
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write the number with scientific notation: -.07 × 10^(-8) 7 x 10^(-8) t…
-7.0 x 10^-10, Mrs. Gamma was reshelving books in the library.
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clue #5 whodunnit? write the number with scientific notation: 980,000 a…
For Clue #5: $9.8\times10^{5}$ For Clue #6: $7.4361\times10^{6}$
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4. how does the rhyme scheme of the poem contribute to the tone?
The rhyme scheme can create a musical quality, emphasize ideas or emotions, and through the repetition of sounds, draw attention to key words, all of which contribute to shaping t…
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lessler > quizzes > (quiz#2) smaw - electrode selection (2) smaw - elec…
welding position
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320 lec 12731 messier > quizzes (quiz#2) smaw - electrode selection a+ …
tensile strength
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question 5 what do the first two digits in a four - digit classificatio…
tensile strength
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drag the terms to the appropriate locations on the concept map.
a. kinetic b. potential c. motion d. chemical energy e. entropy f. heat
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19. write the electron configuration for each of the following atoms. h…
a. Nitrogen: Electron configuration $1s^{2}2s^{2}2p^{3}$, 3 unpaired electrons b. Calcium: Electron configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$, 0 unpaired electrons c. S…
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18. what is the electron configuration for each of the following elemen…
a. $1s^{2}$ b. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$ c. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}$ d. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}$
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16. draw bohr models showing how the electrons are represented in atoms…
For carbon: Draw a nucleus. Around it, draw two electron - shells. The first shell has 2 dots and the second shell has 4 dots. For sodium: Draw a nucleus. Around it, draw three el…
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5.) how many molecules is 3.50 g co₂? (1 point) 4.79×10²² molecules co₂…
$4.79\times 10^{22}$ molecules CO₂
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3.) how many formula units (particles of agno₃) are in 5.50 grams of ag…
D. $1.93\times 10^{22}$ formula units (the closest value to our calculated result)
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3.) how many formula units (particles of agno₃) are in 5.50 grams of ag…
1.93 X 10²² formula units
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3.) how many formula units (particles of agno₃) are in 5.50 grams of ag…
D. $1.93\times 10^{22}$ formula units
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directions: read the following lesson from ck12 (making sure to watch t…
1. B. 721 grams 2. D. $1.77\times 10^{23}$
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5.) how many moles are present in 2.126 g of h₂o₂? (1 point) 0.0625 mol…
0.0625 moles
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3.) how many moles are there in 45.0 grams of sulfuric acid, h₂so₄? you…
3. C. 0.459 moles 4. A. 12.6 g
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read the ck - 12 lesson below (also watching the videos inserted), then…
1. Formula mass in grams 2. 15 g
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leveled practice in 7 and 8, perform the operation and express your ans…
$4.9\times10^{-11}$ ### 8.
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5.) calculate the molar mass of aluminum nitrate (al(no₃)₃. your answer…
213 g/mol
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3.) how many moles are present in 10.0 grams of sodium hydroxide (naoh)…
3. C. 0.25 moles 4. C. 87.7 g
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read the ck - 12 lesson below (also watching the videos inserted), then…
1. A. 55.85 g/mol 2. A. 98.08 g/mol
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chapter 2 question 6 2 parts 0.5 of 1 point state the number and type o…
The answer cannot be determined without knowing the other element reacting with hydrogen.
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9. which piece(s) of equipment should be used to prepare a solution of …
Mohr pipet: Yes Erlenmeyer flask: No Volumetric flask: Yes Beaker: No Graduated cylinder: No
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solution problems 1. how many liters of a 14 percent alcohol solution m…
100 liters ### 2.
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what is the electron configuration for tc? select the correct answer be…
$[Kr]5s^{2}4d^{5}$
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which are the valence electrons for tellurium? select the correct answe…
5s², 5p⁴
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which element has an electron configuration ending in 4p^5? select the …
Br
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research has shown that ____ occur in areas of the brain when a person …
neurological changes
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which element has the electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁵? sel…
Mn
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write a paragraph comparing and contrasting how the poets use topic, rh…
A well - written paragraph would include clear identification of the topics, rhyme - schemes, and figurative language in each poem, along with a comparison and contrast of how the…
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a learning chemistry will open doors for you that would be closed other…
1. Developing new medicines, creating eco - friendly materials. 2. In food science for analyzing food composition or in pharmacy for compounding medications. 3. Helps understand n…
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11. calcium has three different isotopes. one has a mass of 35.00 amu; …
11. The isotope with a mass of 40.00 amu. 12. 41.97876 amu
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which best describes how energy changes form in a cars engine? a single…
C. Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy
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11. calcium has three different isotopes. one has a mass of 35.00 amu; …
41.977 amu
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10. an element exists as 4 different isotopes. 4.35% have a mass of 49.…
a. 52.00 amu b. Chromium (Cr)
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the diagrams below show two pure samples of gas in identical closed, ri…
sample A
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a certain element exists as three different isotopes, 24.1% of all the …
a. The average atomic mass is approximately $74.16$ amu. b. Looking up the atomic - mass on the periodic table, the element with an atomic mass close to $74.16$ amu is Arsenic (As…
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1 outline the trends of the periodic table for ionization energy, atomi…
a. Cs. Because it is in the lower - left of the periodic table and electronegativity decreases down a group. b. Mg. As atomic radius decreases across a period and increases down a…
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near sunrise or sunset, the rays coming directly from the sun strike th…
A. sunlight must pass through an atmosphere more than 12 times thicker than when the sun is directly overhead.
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9. a certain element exists as three different isotopes, 24.1% of all t…
a. $71.16$ amu b. Gallium (Ga)
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a. what is the average atomic mass of this element? b. use your periodi…
a. Approximately 74.83 amu b. Arsenic (As)
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in a gas, particles are far from one another and constantly move in dif…
Particles do not stay in the same position: Both liquids and gases Particles are arranged close together: Liquids Particles are spread far from one another: Gases
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9. a certain element exists as three different isotopes, 24.1% of all t…
a. The average atomic mass of the element is approximately $71.16$ amu. b. Looking up the periodic - table, the element with an average atomic mass close to $71.16$ amu is Gallium…
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identify the correct lewis structure for ni₃. select the single best an…
The Lewis structure with single bonds between N and each of the three I atoms and lone - pairs on N and I (the third option from the top in the image where N is central, bonded to…
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read chapter 2 introduction (pg. 29) and do pre - reading questions (pg…
2.1 Atoms are the smallest units of an element, molecules are made of two or more atoms bonded together. 2.2 Solid: rock; Liquid: water; Gas: oxygen. 2.3 Burning wood is a chemica…
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identify the correct lewis structure for ni₃. select the single best an…
The third structure (from the top) where nitrogen is single - bonded to three iodine atoms and each iodine has 3 lone pairs and nitrogen has 1 lone pair is the correct Lewis struc…
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four atoms are arbitrarily labeled d, e, f, and g. their electronegativ…
DG, EG, DF, DE
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arrange the following bonds in order of increasing ionic character: lit…
carbon to hydrogen, chlorine to fluorine, fluorine to hydrogen, lithium to fluorine
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list the following bonds in order of decreasing ionic character: the zi…
$K - O>Zn - Cl>H - Cl>I - I$
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list the following bonds in order of decreasing ionic character: the zi…
Potassium - oxygen bond in $K_2O$ > Zinc - chlorine bond in $ZnCl_2$ > Hydrogen - chlorine bond in $HCl$ > Iodine - iodine bond in $I_2$
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complete the following table. identify the type of bonding in each subs…
| Substance | Bonding | Highest Melting Point | | ---- | ---- | ---- | | CF₄ | Covalent (Molecular) | | | CCl₄ | Covalent (Molecular) | | | CO₂ | Covalent (Molecular) | | | BaO | …
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for the elements n and br, please indicate whether the binary compound …
Part 1 of 3: covalent Part 2 of 3: $NBr_3$ Part 3 of 3: nitrogen tribromide
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for the elements n and br, please indicate whether the binary compound …
covalent
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all substances are made up of small particles of matter that are consta…
Gas particles are constantly moving.
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for the following pair of elements, b and f, state whether the binary c…
Part 1 of 3: covalent Part 2 of 3: $BF_{3}$ Part 3 of 3: boron trifluoride
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8. if an astatine - 210 atom, element 85, undergoes alpha decay, what a…
For francium - 223 undergoing beta - decay, the produced atom is radium - 223 ($_{88}^{223}Ra$). For astatine - 210 undergoing alpha - decay, the produced atom is bismuth - 206 ($…
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write the chemical symbol, including the charge, for the common anion f…
Part 1: $Br^-$ Part 3: $[\ddot{Br}:]^-$
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116 minutes remaining | 13 of 26 questions remaining calculate the ener…
$3.64\times 10^{-19}$ ### Question 15
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4. explain the trend for ionization energy as you move down a group on …
### Question 4 Ionization energy decreases down a group because outer - electrons are farther from the nucleus and more shielded. ### Question 5 Sodium has fewer electron shells t…
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each of the following sets of quantum numbers is supposed to specify an…
D. \(n = 4\), \(l = 3\), \(m_l=-2\) B. Her results are precise, but not accurate.
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question 2 a new compound was recently discovered and found to have an …
$345.36$ ### Question 3
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name ws#9 formation of elements: nuclear reactions use chapter 17, pp. …
Reactions c and f are fusion reactions.
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question 25 10 points match the electron configuration on the left with…
1. Cl 2. Ar 3. K 4. Br 5. Ne
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draw the lewis dot symbols for the following atoms/ions. part 1 of 2 p …
P: Place the symbol 'P' with one dot on the top, bottom, left, and two dots on the right. Sr²⁺: Just the symbol Sr²⁺ with no dots around it.
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5. calculate the average atomic mass of the element iron(fe) using the …
$55.9$
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name ws#9 formation of elements: nuclear reactions use chapter 17, pp. …
| Nuclear equation | Change in atomic number | Change in number of protons | Change in number of neutrons | Change in mass number | Type of nuclear change | |---|---|---|---|---|-…
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8. calculate the average atomic mass of the element hydrogen(h) using t…
$1.012$ amu
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2. explain why atomic radius decreases as you move from left to right a…
The atomic radius decreases from left to right across a period because the increasing nuclear charge (more protons) pulls the electrons in the same energy level closer to the nucl…
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4. write the atomic symbol (symbol notation) for the two isotopes of ur…
$_{92}^{234}U$, $_{92}^{238}U$
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part i: explain each of the following 1. why are the trends for electro…
The trends for electronegativity and ionization energy are similar because they both depend on the effective nuclear charge and the distance of the outermost electrons from the nu…
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4. write the atomic symbol (symbol notation) for the two isotopes of ur…
1. First uranium isotope: $_{92}^{234}U$, Second uranium isotope: $_{92}^{238}U$ 2. Average atomic mass of iron: $55.9$ 3. Average atomic mass of nitrogen: $14.07$ 4. Average atom…
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question 4. a student is using a procedure to separate a mixture in the…
Part A. Decantación Part B. Densidad y gravedad Part C. Separa una mezcla heterogénea sólido - líquido
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1. four isotopes of lead include lead - 204, lead - 206, lead - 207, an…
1. Lead - 207 and lead - 208 are likely the most abundant. 2. The same number of protons. 3. They are atoms of different elements (carbon has 6 protons and nitrogen has 7 protons).
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question 3. a student is using a procedure to separate a mixture in the…
# Explicación detallada: ## Paso 1: Identificar el procedimiento Se ve un imán cerca de una mezcla que probablemente contiene materiales metálicos. El procedimiento es la separaci…
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due: friday, september 19, 2025 at 11:59 pm rule #5: what is the import…
The order of ingredients is important as it can impact chemical reactions, texture, and the overall result of a mixture or process.
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complete the passage about ionic structures using words from the list: …
1. The stable electron - configurations are 2,8; 2,8,8; 2,8,18,8. 2. - a. [K]⁺ with electron - diagram having 3 electron - shells with 2, 8, 8 electrons respectively. - b. [F]⁻ - …
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customers are sometimes interested in which mouthwash tastes the best. …
B. which mouthwash kills the most germs
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calculate attractive and repulsive forces in ionic bond of kbr. atomic …
The attractive force $F_{attractive}\approx - 2.06\times10^{-9}\ N$ and the repulsive force at equilibrium $F_{repulsive}\approx2.06\times10^{-9}\ N$
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22 mark for review which of the following best describes a characterist…
C. They contain only single bonds between carbon atoms
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a crystallographer measures the horizontal spacing between molecules in…
$1.37$
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calculate the atomic mass of each element described below. then use the…
For problem 32: Atomic mass is approximately 63.44 amu, and the element is Copper (Cu). For problem 33: Atomic mass is approximately 35.45 amu, and the element is Chlorine (Cl).
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an organic chemist measures the temperature t of a solution in a reacti…
292.6
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use the figures to answer the following questions. osmium 76 os 190.23 …
27. 76 28. Nb 29. 190.23 amu 30. atomic mass units (amu) 31. Osmium: 76 protons, 76 electrons; Niobium: 41 protons, 41 electrons 32. Atomic mass is approximately 63.44, element is…
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complete each row of the table below by filling in the missing prefix o…
| Missing Prefix/Exponent | Value | |--|--| | Prefix for $10^{-6}$ | $\mu$ (micro) | | Prefix for $10^{6}$ | M (mega) | | Exponent for $1\ d\ \text{mol}$ | $-1$ | | Exponent for $…
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16. an isotope has an atomic number 51 and a mass number 123. answer th…
24. d. all of the above 25. a. 1/12 the mass of a carbon - 12 atom 26. d. both the relative abundance and the mass of each of the atom's isotopes 18. $_{10}^{22}Ne$ 19. $_{2}^{4}H…
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count the significant digits in each of these measurements: measurement…
4 2 2 5
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count the significant digits in each of these measurements: \begin{tabu…
|measurement|number of significant digits| |--|--| |0.009300 J|4| | - 2.0×10⁻³ kJ/mol|2| |69400. kg|5| |9.6×10⁻¹ mL|2|
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count the significant digits in each of these measurements: measurement…
|measurement|number of significant digits| |--|--| |0.009300 J|4| |$-2.0\times10^{-3}$ kJ/mol|2| |69400. kg|5| |$9.6\times10^{-1}$ mL|2|
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when you’re asked to describe, you need to tell or write about somethin…
A. Huck is smart in an unconventional way. For example, to escape his violent father, he faked his own death in a clever scheme. His relationship with Jim shows that he is also ca…
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count the significant digits in each of these measurements: measurement…
- $-9.0\times10^{-1}\text{ kJ/mol}$: 2 - $7500.\text{ kg}$: 4 - $0.00900\text{ J}$: 3 - $1.4\times10^{-1}\text{ mL}$: 2
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1. formula 1 punto a student collects co₂ gas in a gas collection tube.…
1. 0.17 g/mL 2. 0.0039 L