化學
化學反應、化學計量、分子結構與元素性質。
-
21) the pressure on a 200 - milliliter sample of co₂(g) at constant tem…
A. 100 mL
-
name the functional group shown in each molecule below. the first answe…
Carboxylic acid Ester Alkene
-
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 -…
-
missed this? watch kcv: limiting reactant, theoretical yield, and perce…
$NH_3$
-
it takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce …
C. $2N_2$ and $6H_2$
-
section 4.3 modern atomic theory (pages 113 - 118) this section focuses…
Gains energy; Returns to ground state
-
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…
-
16) a rigid cylinder with a movable piston contains a sample of hydroge…
C. 4.29 L
-
1. what is the group number for each of the following groups; a. noble …
1. a. 18 b. 2 c. 17 d. 3 - 12 e. 1 2. Helium, Neon 3. Lithium, Sodium, Potassium 4. Scandium, Titanium 5. Periods; same number of electron shells 6. Groups; same number of valence…
-
getting to know the periodic table name: wendy per. 2 10/10/23 how ofte…
1. Atomic mass 2. Halogens 3. Groups 4. Lanthanides 5. Alkali metals 6. Liquid 7. Neutrons 8. Semi - conductors 9. Actinides 10. Non - metals 11. Transition metals 12. Alkaline ea…
-
which of the following is an example of chemical weathering? o water br…
acid dissolving limestone
-
jaylens daughter complained that the apple slices in her lunchbox turne…
the number of apple slices that turned brown
-
name: ______________ teacher: ______________ q1 chemistry: u2l16 excite…
7. $[Ne]3s^{2}3p^{5}$ 8. $[Ar]$ 9. $[He]2s^{2}2p^{4}$ 10. $[Ne]$ 11. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}$ 12. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{7}$ 13. 1s: $\uparrow\down…
-
find the element name wendy period 2 10/19/25 i was going to tell anoth…
Fill in the crossword with the above - identified elements according to the grid positions. For example, across 1: fill 'Selenium' in the appropriate horizontal boxes; down 13: fi…
-
q1 chemistry: u2l16 excited electrons prepwork part 1: electron configu…
1. c. Na⁺ 2. a. S⁻² and Cl⁻¹ 3. By calculating the number of electrons in each atom/ion. Atoms/ions with the same number of electrons are isoelectronic and have identical electron…
-
you do: 1) place an x under the appropriate categorization. (you can on…
1. Element 2. Element 3. Heterogeneous 4. Not Matter 5. Compound 6. Homogeneous
-
we do: you add water, salt and sand to a bottle and shake it up. what t…
c) Mixture - Heterogeneous
-
structural formula homework write the formula of each molecule:
$C_7H_6O_2$, $C_9H_{18}O$, $C_4H_9NO_4$
-
i do: what kind of matter is baking soda (nahco₃)? explain your thinkin…
I do: Baking soda ($NaHCO_3$) is a compound because it is composed of multiple elements chemically bonded in a fixed proportion. We Do: c) Mixture - Heterogeneous. Explanation: Wa…
-
art nouveau is a style that emphasizes decorative patterns and organic …
True
-
the production and use of plastic bags has an environmental impact. the…
The process of making ethylene from fossil fuels releases carbon dioxide into Earth’s atmosphere. Plastic bags can be dangerous to animals when they are found in rivers, in oceans…
-
long polyethylene chains can be arranged in different ways. if these ch…
Long side - by - side chains of polyethylene combine to form HDPE. Ethylene is a monomer.
-
to make polyethylene, its monomer ethylene must first be synthesized fr…
High temperatures are required to make ethylene. The synthesis of ethylene is a chemical change.
-
most plastic bags are made of polyethylene. polyethylene is a kind of p…
The first model (the long - chain structure)
-
students in mr. kleins chemistry class are conducting an experiment to …
B. team 2: calculates $0.395\ J/g^{\circ}C$
-
many people use plastic every day. plastic bags, like most other plasti…
natural gas, petroleum
-
4. all plants and animals are made of carbon. why is the decomposition …
4. Decomposers recycle carbon from dead plants and animals back into the environment. Without them, carbon would accumulate in organic matter, halting the carbon - cycle. 5. Human…
-
complete the rhyme scheme. a a a b b b white, glittering sunlight fills…
# Breve explicación: En una esquema de rima, se asigna una letra a cada sonido final distinto en las versos. El primer verso tiene un sonido final, se le asigna la letra A. El seg…
-
long polyethylene chains can be arranged in different ways. if these ch…
- Polyethylene is made of carbon and hydrogen. - Many ethylene molecules are joined together to form polyethylene. - HDPE is made of long side - by - side chains of polyethylene.
-
many people use plastic every day. plastic bags, like most other plasti…
B. petroleum, D. natural gas
-
in the kiln, quicklime reacts with other minerals to make clinker. when…
When heated in a kiln, quicklime reacts with minerals to form clinker. Then, gypsum is added to the cooled powder to make cement.
-
the production of concrete requires cement. almost all cement is made b…
Carbon dioxide is produced when calcium carbonate breaks down. Making quicklime is a chemical change.
-
synthetic materials are made by applying chemical processes to natural …
B. water, C. limestone, D. sand
-
for the following compounds, give the formulas 22) sodium phosphide 23)…
22) $Na_3P$ 23) $Mg(NO_3)_2$ 24) $PbSO_3$ 25) $Ca_3(PO_4)_2$ 26) $(NH_4)_2SO_4$ 27) $AgCN$ 28) $Al_2S_3$ 29) $BeCl_2$ 30) $Cu_3As$ 31) $Fe_2O_3$ 32) $GaN$ 33) $FeBr_2$ 34) $V_3(PO…
-
concept mapping activity 13 - 3 b directions: complete the concept map …
1. nicotine 2. stimulant 3. quitting tobacco 4. psychological 5. physical 6. teens 7. developed 8. breathing 9. heart 10. brain
-
azis drank a glass of orange juice before his chemotherapy treatments a…
A. extinction
-
in the space, write the word(s) from the list that best completes each …
1. Withdrawal symptoms 2. Physical 3. Psychological 4. Relapse 5. Counselor (or similar helping professional) 6. Cravings 7. (+) 8. (0) 9. (+) 10. (+)
-
scientific arguments 1. what are the first 2 parts of a scientific argu…
1. a. Claim b. Evidence 2. a. Experiments b. Observations 3. a. Evidence b. Claim 4. P.E. 5. P.E. 6. KE/PE 7. i 8. a 9. f 10. h 11. c 12. g 13. e 14. d 15. a
-
3 fill in the electrons for the following elements. how many valence el…
C: 1s$^2$2s$^2$2p$^2$3s$^0$3p$^0$, 4 valence electrons Cl: 1s$^2$2s$^2$2p$^6$3s$^2$3p$^5$, 7 valence electrons Li: 1s$^2$2s$^1$2p$^0$3s$^0$3p$^0$, 1 valence electron Ar: 1s$^2$2s$…
-
the functional classification scheme is concerned only with pns structu…
1. central 2. impulses 3. activate 4. voluntary 5. involuntary
-
conceptlink these three overlapping nervous system functions are very s…
1. feedback 2. motor 3. integrates 4. divide 5. relationships
-
complete the chart below using the information provided and a periodic …
| Isotope name notation | Protons | Neutrons | Electrons | Mass number | Atomic number | Isotopic Symbol notation | |---|---|---|---|---|---|---| | Carbon - 14 | 6 | 8 | 6 | 14 | …
-
directions: as you prepare for your test, you should review your notes,…
1. d) electron 2. 2 3. Approximately 6.94 4. d) 7 neutrons 5. a) isotopes Atom - labeling: Protons in center (positively charged), neutrons in center (uncharged), electrons outsid…
-
naming ionic compounds worksheet one give the name of the following ion…
1. Sodium carbonate 2. Sodium hydroxide 3. Magnesium bromide 4. Potassium chloride 5. Iron(II) chloride 6. Iron(III) chloride 7. Zinc hydroxide 8. Beryllium sulfate 9. Chromium(II…
-
down and reused by companies creating new materials. trash is sent to a…
|Description|Value| |--|--| |Total mass of all waste|$3.4$ kg| |Percentage by mass of organic material|$38.24\%$| |Percentage by mass of paper recycling|$20.59\%$| |Percentage by …
-
4. analyze the concept map for matter in figure 3-17. write a brief des…
4. No se puede responder sin ver la figura 3 - 17, pero normalmente muestra categorías y sub - categorías de la materia. 5. Organiza los elementos por número atómico, en períodos …
-
if i should have the drive to seek knowledge of chemistry or greek, ill…
# Breve explicación: Los fragmentos sugieren una discusión sobre las diferentes habilidades y intereses de las personas. Algunos se centran en el conocimiento académico (química, …
-
1. scan the periodic table of the elements on page 72-73. record some o…
a. Un elemento es una sustancia química que no se puede descomponer en sustancias más simples por métodos químicos normales y está conformada por átomos con un número atómico dete…
-
question 7 of 30 fracking is a way to obtain oil and natural gas trappe…
A. They could reduce their use of fossil fuels to decrease the demand for fracking.
-
question 7 of 25 which entity was established by the national park serv…
D. The National Park Service (NPS)
-
question 1 (1 point) the three main groups of elements are metals, nonm…
C. metalloids
-
1. scan section 3.3 use the checklist below as a guide: □ read all sect…
1. Respuestas varían según lo aprendido en la sección. 2. a. Combinación física de sustancias. b. Tiene componentes visiblemente diferentes y no uniformes. c. Tiene una composició…
-
question 13 of 34 what happens to the solids in wastewater at a wastewa…
B. They are typically buried in a sanitary landfill.
-
which element has the greatest atomic number? * hydrogen (h) carbon (c)…
1. D. Iron (Fe) 2. C. These particles weren't known in his time, so he didn't include them 3. B. Between 0 and 1 AMU (Note: This answer has a small error in the options as the act…
-
reading quiz: conservation of mass 1 multiple choice 1 point if you wan…
B. Count the total number of atoms of each element on both sides
-
question 4 of 33 which of these is an advantage of using natural gas in…
A. When burned, it releases fewer chemicals than oil and coal.
-
carbon-12 and carbon-13 are isotopes of carbon. which of the following …
They both have the same atomic number.
-
boron occurs naturally as two isotopes. what is the difference between …
They have different numbers of neutrons and different mass numbers.
-
a lithium atom has three protons, three neutrons, and three electrons. …
B. 0
-
which element has 16 protons in its nucleus? neon oxygen sodium sulfur
D. sulfur
-
n atom contains one proton, one electron, and one neutron. which two pa…
C. the proton and the neutron
-
the mass number of fe²⁺ is 56. how many neutrons are there in a single …
30
-
the table below gives the numbers of protons, electrons, and neutrons i…
C. 3
-
carbon dioxide: 2nh3(aq) + co2(aq) → ch4n2o(aq) + h2o(l) in an industri…
$67.0\%$
-
the contamination that results from a transfer of pathogens from one fo…
A. Cross - contamination
-
in an industrial synthesis of urea, a chemist combines 145.7 kg of ammo…
$256.8\ kg$
-
missed this? watch kcv limiting reactant, theoretical yield and percent…
Part C: \(Na\) Part D: \(Br_2\)
-
3. calculate the average atomic mass of gold with the 50% being gold-19…
197.5 ### 4.
-
25.0 g n₂o₅ express your answer in moles to three significant figures. …
0.231 mol
-
balance the equation and calculate how many moles of o₂ form when each …
Part D: 0.231 mol Part E: 23.6 mol
-
missed this? watch kcv: reaction stoichiometry, me: stoichiometry, clic…
Part B: $n = 0.85$ mol Part C: $n = 1.9$ mol
-
missed this? watch kcv reaction stoichiometry, iwe stoichiometry. we st…
\(\alpha = 2,\beta = 4,\gamma = 1\)
-
16. chemical name: hydrogen cyanide formula: hcn lewis electron - dot s…
Lewis electron - dot structure: H - C≡N (with two non - bonding electrons on N) Perspective drawing with bond angles: Linear, 180° Standard electron geometry: Linear Molecular geo…
-
14. chemical name: difluoroethylene formula: c₂h₂f₂ lewis electron - do…
# Explanation: ## Step1: Determine Lewis structures The two possible Lewis - electron dot structures for $C_2H_2F_2$ with a single $F$ and a single $H$ bonded to each $C$ and $C -…
-
1. which line is straight? the ideal gas line 2. what affects the slope…
1. The ideal gas line 2. The volume and pressure of the gas affect the slope of the line. 3. The other lines for $CO_2$, $N_2$, and $He$ aren't straight because real gases don't f…
-
13. chemical name: hydrogen sulfite anion formula: hso₃⁻ lewis electron…
Lewis electron - dot structure: S is central, single - bonded to H, double - bonded to one O and single - bonded to two other O's, one of the single - bonded O's has a negative ch…
-
12. chemical name: bromine trifluoride formula: brf3 lewis electron - d…
Lewis electron - dot structure: Br is in the center with 3 single bonds to F atoms and 2 lone - pairs on Br. Perspective drawing with bond angles: The F - Br - F bond angles are a…
-
11. chemical name: hydrogen sulfide formula: h2s lewis electron - dot s…
Lewis electron - dot structure: S is the central atom with two single bonds to H atoms and two lone pairs of electrons on S. Standard electron geometry: Tetrahedral Molecular geom…
-
10. chemical name: selenium pentafluoride cation formula: sef5+ lewis e…
Lewis electron - dot structure: Se is in the center with 5 single bonds to F atoms, and each F has 3 lone - pairs. Standard electron geometry: Octahedral Molecular geometry: Squar…
-
9. chemical name: sulfur pentachloride anion formula: scl₅⁻ lewis elect…
Lewis electron - dot structure: Sulfur in the center with 5 single bonds to chlorine atoms and 1 lone pair on sulfur, and each chlorine has 3 lone pairs. Perspective drawing with …
-
chemical name: phosphorus monoxide trichloride formula: pocl₃ lewis ele…
Lewis electron - dot structure: P is the central atom with a double - bond to O and single - bonds to three Cl atoms. O has 2 lone pairs and each Cl has 3 lone pairs. Perspective …
-
diatomic iodine has many biological uses. it reacts with starch, making…
253 g/mol
-
healthy grains is an organic food company that makes several different …
$y = 4x$
-
7. chemical name: bromine tetrachloride cation formula: brcl4+ lewis el…
Lewis electron - dot structure: Br is in the center with single bonds to 4 Cl atoms and 1 lone - pair on Br. Perspective drawing with bond angles: Seesaw shape with approximate bo…
-
understanding checkpoint atoms 1. atoms are the basic building block fo…
1. matter 2. a. protons 3. c. nucleus 4. a. Smaller than proton and negative charge 5. c. Electrons and Protons 6. electron cloud 7. Neutron 8. Electron 9. Nucleus 10. Proton
-
6. chemical name: bromine tetrafluoride anion formula: brf4- lewis elec…
Lewis electron - dot structure: Br is in the center with 4 single bonds to F atoms and 2 lone - pairs on Br, and 3 lone - pairs on each F. Perspective drawing with bond angles: Sq…
-
5. chemical name: selenium dioxide formula: seo₂ lewis electron - dot s…
Lewis electron - dot structure: Se with a lone pair and double - bonds to each O. Perspective drawing with bond angles: Bent shape with bond angle less than 120°. Standard electro…
-
which of the following contains a vague pronoun reference? after peter …
After Peter explained the chemistry homework to Dave, he understood it better, too.
-
earth & space science homework review directions: choose the best answe…
1. B. longer wavelengths (redshift) 2. C. The farther away a galaxy is, the greater its redshift. 3. D. Human existence is extremely recent compared to the age of the universe. 4.…
-
4. chemical name: chlorate anion formula: clo₃⁻ lewis electron - dot st…
Lewis electron - dot structure: Cl is in the center, single - bonded to three O atoms. Resonance exists as the double - bond can be formed with any of the three O atoms. Perspecti…
-
of the following options, which is the best topic sentence? restaurants…
Restaurants should support better health by giving customers a choice of organic - grown foods.
-
8. when assessing for arm drift of a patient with a suspected stroke, y…
8. D 9. D 10. B 11. A 12. A 13. C 14. B
-
which of the following correctly gives the best coefficients for the re…
C. 1, 2, 1, 4
-
a chemical equation is balanced when a d) the number of atoms of each e…
A. the number of atoms of each element is the same in reactants and products
-
magnesium reacts with oxygen gas to produce magnesium oxide, light, and…
D. A) a combination reaction.
-
question 7 in this set of chemical reactions, which is a single replace…
C. Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g)
-
in the following reaction, what is the correct coefficient for aluminum…
C. 2
-
which of the following is a combination reaction? a) d) agno3 (aq) + na…
C. $N_2(g)+O_2(g) ightarrow 2NO(g)$
-
in a _____ reaction, two or more elements or compounds form one product…
D. combination
-
which products would result from the double replacement reaction betwee…
C. \(NaCl(aq)\) and \(MgCO_3(s)\)