Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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4) use the mass spectrum below to fill out the information in the table…
For the isotope with mass 88 amu (most abundant): - Protons: 38 - Neutrons: 50 - Mass: 88 amu - Relative Abundance: 82.58% (Adjust for other isotopes using the same logic.)
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in the chemical closet, you found an unlabeled vial with a solid piece …
The average atomic mass of element Z is approximately $\boldsymbol{85.47\ \text{amu}}$. (This matches the atomic mass of Rubidium (Rb), so the mystery element Z is likely Rubidium…
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2) determine the most likely element for the mass spectrum given below.…
Tungsten (justification: Its isotopic mass - intensity pattern in the mass spectrum matches the given peaks, with appropriate abundance and mass values relative to other options l…
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2) determine the most likely element for the mass spectrum given below.…
Zirconium (assuming the base peak in the mass spectrum corresponds to its atomic mass - related isotope abundance, with the most intense peak matching Zirconium's isotopic mass di…
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1) the mass spectrum of a sample of a pure element is given below. calc…
The average atomic mass is approximately \( 24.32 \) amu, and the element is Magnesium (Mg).
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1) the mass spectrum of a sample of a pure element is given below. calc…
The average atomic mass is approximately 63.55, and the element is Copper (Cu).
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86. explain when powdered iron is left exposed to the air, it rusts. ex…
Rusting is a reaction where iron (\(Fe\)) reacts with oxygen (\(O_2\)) and water (\(H_2O\)) from air (\(4Fe + 3O_2+ 6H_2O ightarrow 4Fe(OH)_3\), then to rust). By the law of conse…
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4) given 10.00 gram samples of licl, libr, lif and lii, place the sampl…
Order (least to greatest number of Li atoms): \( \text{LiI} < \text{LiBr} < \text{LiCl} < \text{LiF} \)
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*85. interpret graphs the mass of the elements iron and oxygen in four …
Yes, all four samples are the same compound. This is because the mass ratio of iron to oxygen is constant for each sample (e.g., for the first sample with 2 g oxygen and 5 g iron,…
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84. explain explain why this statement is false. \because there is no c…
The statement is false because physical changes (no compositional change) can still alter a substance’s appearance. Physical changes affect physical properties (state, shape, size…
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83. apply concepts a change in odor can also be a clue that a chemical …
One situation: When milk spoils. Fresh milk has a mild smell, but as it undergoes chemical changes (due to bacterial action), it develops a sour, unpleasant odor. Another situatio…
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82. sequence assume that water, mercury, and gallium are all at 40°c. a…
Gallium will freeze first (because its freezing point \(29.76^\circ\text{C}\) is the highest among the three, so as temperature drops from \(40^\circ\text{C}\), it will reach its …
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think critically *81. apply concepts devise a way to separate sand from…
1. First, use filtration to remove charcoal from the mixture (charcoal, sand, sugar, water). The charcoal is trapped on the filter paper, and the filtrate contains sand, sugar, an…
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80. the wax seems to disappear as a candle burns. how can the law of co…
When a candle burns, wax (a hydrocarbon) reacts with oxygen (\(O_2\)) from the air. By the law of conservation of mass, the total mass of reactants (wax + \(O_2\)) equals the tota…
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79. explain why the production of a gas does not always mean that a che…
The production of a gas does not always indicate a chemical reaction because gas can be produced through physical changes (e.g., boiling water to form water vapor, or releasing a …
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78. classify each of the following as a chemical change or a physical c…
** Chemical change ### Part (b) Digestion breaks down food (e.g., carbohydrates to glucose) via chemical reactions (enzymes, metabolism). New substances form.
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click to fix any capitalization errors below. click \submit answer\ if …
Submit Answer
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77. in photograph a, a coil of zinc metal is in a solution of sulfuric …
In photograph A, the formation of gas bubbles (around the zinc coil in sulfuric acid) indicates a chemical change (gas production is a sign of a reaction, e.g., $\ce{Zn + H_2SO_4 …
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75. identify each of the following as an element, compound or mixture. …
s: a. Element b. Compound c. Mixture d. Element e. Mixture f. Compound
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in the h mart food court, i find myself again, searching for the first …
H Mart is a "beautiful, holy place" for Zauner as it connects her to her Korean heritage and the memories of her mother and aunt. The Korean - themed scenes (mother - son interact…
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74. how are the items in each of the following pairs similar? how are t…
### Part a: Copper and Silver #### Similarities: - Both copper (Cu) and silver (Ag) are **metals** belonging to the transition metals group in the periodic table. - They exhibit c…
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73. classify the following properties of the element silicon as chemica…
Physical property ### Part (b) #### Step 1: Analyze the property type Brittleness (a measure of how easily a substance breaks) is a physical property. It is determined by the phys…
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72. identify each of the following items as a mixture or compound. clas…
To solve this, we recall the definitions: - **Compound**: Pure substance with fixed composition (atoms chemically bonded). - **Mixture**: Combination of substances (not chemically…
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71. you are standing in a kitchen and then in the middle of a park. whe…
In both the kitchen and the park, you see mostly mixtures.
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*70. use the arrangement of particles in solids and gases to explain wh…
In solids, particles are closely packed with very small interparticle spaces. In gases, particles are far apart with large interparticle spaces. Compression requires reducing inte…
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69. the state of a substance can change when the substance is heated or…
- **Solid**: Molecules are closely packed in a fixed, ordered structure, giving a definite shape and volume. - **Liquid**: Molecules are close but move past each other, having a d…
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68. is malleability an extensive property or an intensive property? exp…
Malleability is an intensive property. This is because intensive properties do not depend on the amount of the substance present, and malleability (the ability to be hammered into…
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the stimuli for kinesthesis is the ______ energy of joint and muscle mo…
C. mechanical
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*67. explain why mass cannot be used as a property to identify a sample…
Mass is an extensive property (depends on the amount of matter). Different quantities of the same substance have different masses, and different substances can have the same mass.…
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understand concepts use the data table to answer questions 63–66. | sub…
Ethanol ### Question 64
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photoelectron spectroscopy the complete photoelectron spectra of two un…
B. Element Y has a larger atomic radius than element X.
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*62. when ammonium nitrate (nh₄no₃) explodes, the products are nitrogen…
18 grams
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61. which type of property cannot be observed without changing the comp…
Chemical property
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59. use the word equation below to explain how a chemical change differ…
In the word equation \( \text{iron} + \text{sulfur} \xrightarrow{\text{heat}} \text{iron sulfide} \), a **chemical change** occurs because new substance (iron sulfide) forms from …
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below are the pes spectra for the valence electrons for oxygen and nitr…
### Part (a): Electron Configuration #### Step 1: Recall Atomic Numbers Oxygen (O) has atomic number 8; Nitrogen (N) has atomic number 7. #### Step 2: Write Electron Configuration…
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58. look up the word periodic in the dictionary. propose a reason for t…
The word "periodic" means occurring with regular intervals or a repeated pattern. The periodic table is named this way because the chemical elements are arranged such that their c…
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r1 – redox half reactions 1. write the redox half reaction for the foll…
Half - reaction: \( \text{Na} ightarrow \text{Na}^+ + e^- \); Original substance (Na) is oxidized. ### Problem 1b: Formation of chloride ion
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______ contain(s) detailed information about hazardous materials to hel…
c. Safety data sheets (SDS)
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all of the following statements regarding safety data sheets (sds) are …
b. If you are using more than one product, consult the SDS of only one of the products.
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56. not all element names come from english or latin words. the symbol …
Element symbols can be derived from the element's name in non - English/Latin languages. For example, W (tungsten) comes from German “wolfram” and Hg (mercury) from Greek “hydragy…
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measurement a. 726,444.0 b. 44585 c. 123.64 d. 0.0200 e. 0.09000333 f. …
Scientific Notation: \(7.26444\times10^{5}\) Number of Significant Figures: 7 ### Part b: 44585
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55. name the elements found in each of the following compounds. a. ammo…
Ammonia ($\ce{NH_3}$) contains nitrogen (N) and hydrogen (H). ### Part b: Potassium oxide ($\ce{K_2O}$)
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which element is represented by the pes absorption spectra shown?
Oxygen (O)
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54. describe the relationship between the three items in each of the fo…
- Hydrogen: Element - Oxygen: Element - Water: Compound Relationship: Hydrogen and oxygen react chemically to form the compound water. #### Part b
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14. 2500 grams of 1-propanol solution was used in a calorimeter as the …
The specific heat capacity of 1 - propanol is \( 2.3 \) kJ/kg\(^\circ\)C.
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question 3 what is the term referred to when fathers or significant oth…
A. Bonding
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*53. classify the following materials as an element, compound, or mixtu…
Compound. Reason: NaCl is made of two different elements (Na and Cl) chemically bonded in a fixed ratio. ### Part b: Salt water
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fill in the blank question one or more substances dissolved in another …
solution
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2.3 elements and compounds 52. how could you distinguish an element fro…
To distinguish an element from a compound: 1. **Chemical Decomposition**: An element cannot be broken down into simpler substances by chemical reactions (it is the simplest form o…
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multiple choice question a substance that reduces the proton concentrat…
B. base
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fill in the blank question a substance found in lesser quantity that di…
solute
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fill in the blank question hydrochloric acid (hcl) and sulfuric acid (h…
hydrogen (\(H^+\))
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2.3 elements and compounds 52. how could you distinguish an element fro…
An element is a pure substance with only one type of atom (cannot be chemically broken down into simpler substances). A compound is a pure substance with two or more elements chem…
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multiple choice question what property of water causes water to bead to…
Cohesion (the option labeled "Cohesion")
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multiple choice question when an atom either gains or loses electrons, …
an ion
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multiple choice question in the picture, a carbon atom is joined to fou…
covalent
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multiple choice question to make lemonade, water is combined with lemon…
A. Water is the solvent
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multiple choice question the relatively strong attractive force that ho…
B. a chemical bond
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fill in the blank question 8 of 29 concepts completed water has cohesiv…
hydrogen
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multiple choice question there are two types of subatomic particle loca…
The neutron
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fill in the blank question if a substance cannot be broken down by chem…
element
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fill in the blank question when sodium chloride (nacl) is dissolved in …
ions
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multiple choice question a cat, a turtle, a human, and a book all have …
B. They are all considered matter (assuming the options are labeled A, B, C as: A. They are all examples of molecules, B. They are all considered matter, C. They all can do work o…
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multiple choice question what type of bond involves two or more atoms s…
D. covalent bond
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fill in the blank question chemical bonds such as the covalent bond hol…
First blank: atoms; Second blank: molecules (or compounds)
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fill in the blank question atoms with the same number of protons belong…
element
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multiple choice question atoms are extremely small particles and are co…
B. protons, neutrons, and electrons.
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multiple choice question when two or more atoms are chemically joined, …
D. molecule
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multiple choice question all matter is composed of ______, which are th…
C. atoms
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3) the complete photoelectron spectrum for an element is shown. what ox…
c) \( \boldsymbol{XO} \)
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you do: 1) which of the following has the same number of electrons as c…
d) \( \text{K}^+ \)
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we do: element 117 was recently discovered and is named tennessine. ass…
Noble gas electron configuration: \(\boldsymbol{[Rn]7s^25f^{14}6d^{10}7p^5}\); Ionic compound formula: \(\boldsymbol{MgTs_2}\)
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question 22 - 1 point sheena’s multivitamin contains 1100 mg of potassi…
\(1.1\)
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2. how many cu atoms are there in 7.55 g cu? cu=63.55g 7.55×2 +63.55=78…
Approximately $7.15 \times 10^{22}$ Cu atoms.
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solid liquid gas plasma 1. a __________ does not have a definite shape …
Gas #### 2.
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if a chemical splashes in the eyes, the eyes should be flushed in an ey…
d. For 15 minutes.
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based on the molecules below, indicate whether each of the following st…
False ### 2. Second Statement:
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in the image below, which of the following correctly indicates shared e…
The correct option is the bottom - most choice (with \( \delta^- \) on N, \( \delta^+ \) on H - N, \( \delta^- \) on O, \( \delta^+ \) on H - O, and \( \delta^+ \) on C in \( C = …
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name: ... class ... date ... use the words and phrases to complete the …
B. Molecule #### Question 2:
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what type of control would describe training, inspection, and housekeep…
Administrative
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what are the potential chemical hazards of a sprayed paint mist in a wo…
A. Inhalation, B. Absorption
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1 complete the following table. | isotopic symbol (nuclear form) | isot…
To solve the isotope table, we use the following relationships: - Atomic number (\(Z\)) = Number of protons = Number of electrons (in neutral atoms). - Mass number (\(A\)) = Numbe…
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9 in what way are atoms similar to building blocks? a they can only be …
D. They combine to form different structures
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8 what evidence supports the idea that seawater is a homogeneous mixtur…
C. It tastes just as salty throughout the entire mixture
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7 what is the relationship between atoms and elements? a atoms are simp…
B. Atoms are the basic units of elements
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6 what is the similarity between a compound and a mixture? a they conta…
A. They contain more than one element
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5 why is water both a compound and a pure substance? a it is made of al…
B. It is made of all the same kind of molecules, but each molecule contains more than one type of atoms
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4 classify each statement based on the type of mixture it describes. pa…
To solve this, we recall the definitions of heterogeneous and homogeneous mixtures: - **Heterogeneous Mixture**: Components are not evenly distributed (visible differences, variab…
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3 match each word with its description. rearrange matter form bond prop…
- All substances: Matter - Create: Form - Connect: Bond - Move around: Rearrange - Characteristic: Property
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2 what is an effect of a chemical reaction? choose three. alteration of…
- Alteration of chemical bonds - Formation of a new substance with different properties - Change in chemical properties
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1 which ingredients can combine to form a compound? choose two. table s…
B. Carbon, F. Oxygen
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model 2 – results of alka-seltzer® experiment trial | number of alka-se…
Trial 5
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problem 2-9 which of the following pairs of structures represent resona…
### Problem 2 - 9 #### Part (a) # Brief Explanations: Resonance forms differ only in the distribution of electrons (π electrons or lone pairs), not in the position of atoms. In th…
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model 2 – results of alka-seltzer® experiment | | trial 1 | trial 2 | t…
Trial 5 ### Question 6a
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a orbital by definition is a the path on which the electron resides b t…
C. the space around the nucleus where the probability of finding the electron will be maximum
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all four quantum numbers for any electron can be same or different
False
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as you move away from the nucleus, the energy of an electron increases
True
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for n=2, the total number of subshells possible are a 2 b 1 c 0 d data …
A. 2
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for n=2, total number of orbitals are a 3 b 2 c 1 d 4
D. 4
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any orbital can hold a maximum of ____ electrons a 1 b 2 c 3 d any amou…
B. 2