化学
化学反応、化学量論、分子構造、元素の性質。
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oxidation number indicates the charge of an atom alone or in a molecule…
True
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what happens with the referenced oxidation number when the element with…
A. decrease
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the oxidation number for the element fluorine when it is in a compound …
-1 (the option with -1, e.g., if the first option is labeled as A, then A. -1)
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in most compounds, the oxidation number of oxygen is ______. -1 -2
-2 (the option corresponding to -2, which would be the second option in the given choices: the option with -2)
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listen and learn comprehension check fill out the chart with details ab…
To fill out the chart for the poems "If" (by Rudyard Kipling) and "The Rhodora" (by Ralph Waldo Emerson), we analyze their structural and literary elements: ### 1. **Number of Lin…
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short answer - choose 3 to answer 1. briefly discuss some of the effect…
Effects of overgrazing on rangeland include vegetation degradation (increased soil erosion, reduced plant cover), soil quality decline (lower organic matter, poor structure), and …
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what is the overall charge on the nucleus of a fluorine atom? -1 +9 -9 …
B. +9
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strontium and barium have similar chemical properties because atoms of …
B. valence electrons
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how many days are required for 200. grams of radon-222 to decay to 50.0…
7.64 days
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k-12 conservation of mass in chemical reactions 9/10 you have 2 questio…
TRUE
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-12 conservation of mass in chemical reactions 8/10 you have 3 question…
FALSE
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write the name of each of the following compounds: nh₄cl li₂s al₂o₃ snc…
### Part 1: Naming Compounds #### 1. $\ce{NH4Cl}$ ## Step1: Identify cation and anion. Cation: $\ce{NH4+}$ (ammonium), Anion: $\ce{Cl-}$ (chloride). ## Step2: Combine names. Name:…
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a chemical occurs when some substances change chemically to other subst…
reaction
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chemical reactions are represented by chemical formulas. true false che…
FALSE
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which chemical reaction is correctly balanced? a \\( ch_4 + 2o_2 \ ight…
a. \(CH_4 + 2O_2 ightarrow CO_2 + 2H_2O\)
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which equation shows that mass is conserved in the chemical reaction? a…
c. \(4Al + 3O_2 ightarrow 2Al_2O_3\)
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which equation shows that mass is conserved in the chemical reaction? a…
d. \(N_2 + 3H_2 ightarrow 2NH_3\)
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which statement is true about the following reaction equation? $\\ce{n_…
d. The reaction is balanced with the same number of each element on both sides, so it obeys the law of conservation of mass.
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lavoisier was careful to use a sealed jar in order to best confirm cons…
mass
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which word best completes the following sentence: antoine laurent lavoi…
b. mass
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unit 9: mixed ionic compounds directions: answer each question complete…
- Cation: \( \text{Ba}^{2+} \) - Anion: \( \text{SO}_3^{2-} \) - Formula: \( \text{BaSO}_3 \) ### Part b: Lead(IV) Phosphate
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read the poem. skimming the bottom in the company of toes, i observe th…
B. abcb
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experimental data a student mixed four white colored solids into separa…
formation of a gas
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the difference between two marked values is 5 ml and there are 5 spaces…
1 mL (Option: 1 mL)
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the calibration of this graduated cylinder is 50 ml. we can estimate to…
740 mL (assuming the option is, for example, B. 740 mL)
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suppose you have a graduated cylinder with a calibration of 10 ml. how …
C. to the nearest 1 milliliter (Note: Assuming the third option is labeled C; if the original options have labels like A, B, C, D with the third being "to the nearest 1 milliliter…
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what does this symbol (a red diamond with a black exclamation mark insi…
The chemical is an unhealthy kinds (irritant). (Assuming the last option is "The chemical is an unhealthy kinds (irritant)" as per typical GHS symbols; if the options were, e.g., …
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which of these is a common use for a ring stand? it is used for support…
It is used for supporting glassware during heating or filtering.
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what is this piece of lab equipment? clay triangle volumetric flask rin…
C. ring stand
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what is the purpose of a funnel? it creates a specific concentration an…
B. It allows for catching and directing the flow of liquids. (Here we assume the second option is labeled as B. If the original options had different labels, adjust accordingly ba…
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what is the piece of equipment the arrow is pointing to? a beaker a fun…
B. a funnel
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which of these is an example of chemistry you might find at a baseball …
D. a baseball made of rubber
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which type of chemistry studies the interactions of atoms and molecules…
B. Biochemistry
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101. a student makes the following claim: \differences in properties ca…
b. Diamond and graphite; two different structural forms of \( \text{C}_4\text{H}_{10} \)
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the half-life of a certain tranquilizer in the bloodstream is 38 hours.…
\(5.8\)
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83. a student compares diamond, graphite, and two different $\\ce{c4h10…
d. Diamond and graphite are allotropes; the \( \text{C}_4\text{H}_{10} \) compounds are isomers. ### Question 84
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the half-life of the radioactive element unobtanium-53 is 5 seconds. if…
20
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73. a student claims that the nh₄cl(aq) solution formed is a homogeneou…
b. The \( \text{NH}_4\text{Cl} \) dissolves into ions that are evenly distributed throughout the water. ### Question 74
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71. a chemist claims that calcium oxide is ionic because of the large e…
a. \(|1.0 - 3.4| = 2.4\), indicating a large difference consistent with ionic bonding ### Question 72
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68. a student analyzes the halogens f, cl, br, and i and claims that th…
d. Additional occupied energy levels are added as the atomic number increases, placing valence electrons farther from the nucleus and increasing the atomic radius. ### Question 69
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49. which phrase describes a specific compound? 1 a. can contain only o…
c. is composed of elements chemically combined in a definite ratio ### Question 50
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45. as an atom in the ground state changes to an atom in an excited sta…
a. absorbs energy ### Question 46
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18. what is ionization energy, and how does a larger electrostatic forc…
Ionization energy is the energy required to remove an electron from a gaseous atom/ion. A larger electrostatic force between nucleus and electron increases the ionization energy (…
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what are examples of short-term goals? check all that apply. □ maddox s…
- Maddox studies hard because he wants to get an "A" on his chemistry quiz. - Clara wants to take a year - long Spanish class. - Aden wants to get a summer job during his school v…
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in the periodic table, what is the formal term for the horizontal seque…
B. Periods
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consider a solution with a ph of 3. how would you describe this solutio…
Acidic (the option labeled "Acidic")
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what is the first step in ipm? burn the entire crop field monitoring an…
monitoring and assessing pest levels
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how should chemical pesticides be used in integrated pest management? f…
C. sparingly, with the aim of controlling pests (assuming the options are labeled A - D with A: for complete pest extinction, B: liberally and frequently, C: sparingly, with the a…
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which of these terms describes a pesticide that does not break down eas…
A. persistent
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what term do environmental scientists use to describe the increased con…
A. biomagnification
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pesticide use and misuse pesticide use and misuse use the following sce…
The correct option (assuming the option with "biomagnification" is one of them, likely the intended answer) is the one labeled with "biomagnification" (exact option label depends …
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what term is used to describe the accumulation of a toxic chemical in t…
Bioaccumulation
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which of the following is a popular pesticide used in both world wars? …
DDT
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what does organic agriculture avoid using? natural fertilizers traditio…
C. synthetic pesticides and fertilizers
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structure of poetry quick check if by rudyard kipling if you can talk w…
ABAB CDCD
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structure of poetry quick check what is a structural characteristic of …
Many lines or stanzas begin with the same word or phrase.
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structure of poetry quick check what is a quatrain? (1 point) ○ a group…
a group of four lines of poetry with the same rhyme scheme
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what is the aesthetic impact of a poem? (1 point) ○ the meter and rhyme…
B. how the poem affects the reader's senses
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structure of poetry quick check what is rhyme scheme? (1 point) ○ the o…
A. the ordered pattern of rhymes at the ends of lines of a poem
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11 state one commercial use of calcium oxide 12 the following data give…
One commercial use of Calcium Oxide is in the manufacture of cement (or as a desiccant, in steel production, or for soil liming). ### Question 12(a)
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name: campus: science: how air conditioners make cities hotter u4l2.2 t…
Container C ### Question 2
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what is the method for organizing elements in the periodic table? only …
A. only the atomic number of an element
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1 mole = 6.022 × 10²³ particles. what is this quantity is known as? ○ a…
B. Avogadro's number
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fritz habers synthesis of ammonia from atmospheric nitrogen—a process t…
B. admired
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directions: identify another chemical reaction that is important to you…
An important chemical reaction in daily life is the combustion of gasoline in vehicles. The general reaction for a hydrocarbon (like octane, \(C_8H_{18}\)) in gasoline is \(2C_8H_…
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answer the following question in 3-4 complete sentences. compare and co…
Bronze is a copper - tin alloy, and iron is a pure elemental metal. Both were vital in historical metallurgy, with bronze used in the Bronze Age for workable tools/art and iron (I…
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compare and contrast bronze and iron.
### Similarities: - Both are metals used in historical tool - making, construction, and weapon - making, playing key roles in technological development (e.g., Bronze Age and Iron …
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answer the following question in 1-2 complete sentences. define metal. …
A metal is a shiny, malleable, ductile, and good heat/electricity - conducting substance; the four primary types of metal are ferrous metals, non - ferrous metals, precious metals…
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answer the following question in 3-4 complete sentences. describe the p…
Silver is a shiny, white - metallic element with high electrical/thermal conductivity, malleability, and ductility. Historically, it served as currency to facilitate trade, was us…
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Ba^{2+}$ | $NO_{2}^{-}$ | $Ba(NO_{2})_{2}$ | barium nitrite | | $Ca^{2+}$ | $SO_{3}^{2 -…
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text-dependent questions directions: for the following questions, choos…
1. D. Water scarcity is an issue primarily caused by humans that needs to be addressed by humans. 2. B. "In Ranipet, India, leather tanning wastes contaminate groundwater with the…
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draw the lewis structure created by the curved arrow. write in formal c…
H<sub>3</sub>C<sup>-</sup>-N<sup>+</sup>H<sub>2</sub> (with the negative formal charge on carbon and positive formal charge on nitrogen)
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name the functional group shown in each molecule below. the first answe…
Carboxylic acid Ester Alkene
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2. what type of chemical reaction took place when you mixed lead (ii) n…
1. Double - displacement reaction for lead (II) nitrate and potassium iodide. 2. $Pb(NO_3)_2+KI ightarrow PbI_2 + KNO_3$ (skeletal), $Pb(NO_3)_2 + 2KI ightarrow PbI_2+2KNO_3$ (bal…
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group of elements with the same number of valence electrons. vertical c…
1. Group 2. Group 3. Period 4. Periodic trend 5. Alkali metals 6. Alkaline - earth metals 7. Transition metals 8. Halogens 9. Noble gas 10. Metal 11. Metalloid
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vertical column in the periodic table of elements such as alkali metals…
Group
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vertical column in the periodic table of elements such as alkali metals…
Group
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you can use this periodic table during the quiz. however, as stated in …
A. $SF_6$
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section 4.3 modern atomic theory (pages 113 - 118) this section focuses…
Gains energy; Returns to ground state
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pino yogurt is currently the only frozen yogurt shop on the east side o…
A second frozen yogurt store on the east side can offer consumers more product variety and potentially better quality (if they prefer organic), but also higher prices. Consumers c…
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atomic theory (fill in the blank) give name of scientist and name of mo…
1. A. $(35\times0.75)+(37\times0.25)$ 2. J. is mostly empty space. 3. C. two more neutrons. 4. J. 18 5. C. $13e^-,13p^+$, and $14n$ 6. J. $1s^22s^22p^63s^23p^64s^2$
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video discussion guide questions. 1. what is an atom? 2. what are the p…
1. The smallest unit of ordinary matter that forms a chemical element. 2. Protons, neutrons, and electrons. 3. Groups of two or more atoms held together by chemical bonds. 4. Hydr…
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____ is an inorganic nutrient that the body usually needs in small amou…
C. A mineral
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____ is an inorganic nutrient that the body usually needs in small amou…
C. A mineral
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question 10 (1 point) saved a molecule exhibits the trigonal planar sha…
Three
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bromine, a liquid at room temperature, has a boiling point of 58 °c and…
pure substance.
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question 11 (1 point) the bond angle in co3 2- is expected to be approx…
C. 120 degrees
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elements, compounds, and mixtures a teacher makes this statement. \gaso…
distillation of a mixture
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for each nonmetal below, identify how many covalent bonds (shared elect…
H: 1 C: 4 N: 3 O: 2 Cl: 1
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question 12 (1 point) a molecule exhibits the trigonal bipyramidal shap…
Five
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which is a substance that is made up of only one type of atom? mixture …
D. element
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oxygen difluoride (of₂) and magnesium oxide (mgo) are both oxygen compo…
A. $OF_2$
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ments, compounds, and mixtures which is a pure substance? soda carbon d…
# Breve explicación: Un sustantivo puro es una sustancia que tiene una composición química constante y definida. El sodio es una mezcla de gas carbonático, agua y otros aditivos. …
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question 14 (1 point) saved the geometry of the icl2 - molecule is best…
linear
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which of these elements forms the same number of covalent bonds (shared…
D. chlorine
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which best describes an element? an impure substance a pure compound a …
a pure substance
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question 13 (1 point) based on the vsepr theory, which one of the follo…
Question 13: HCN Question 14: linear
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which is a characteristic of mixtures? they are chemically bonded toget…
# Breve explicación: Las mezclas son compuestos formados por dos o más sustancias físicamente combinadas. No están unidas químicamente, no tienen proporciones fijas y no son susta…
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nitrogen forms covalent bonds with which of these elements? choose 2 an…
A. hydrogen, C. nitrogen
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the chemical formula for an emerald is be₃al₂(sio₃)₆. an emerald can be…
# Breve explicación: Los compuestos son sustancias puras formadas por dos o más elementos químicos combinados en proporciones fijas. La fórmula química del esmeralda, $Be_3Al_2(Si…