化学
化学反応、化学量論、分子構造、元素の性質。
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select a word from the drop - down menu to correctly complete the state…
group
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dehydration synthesis in each example of dehydration synthesis, show ho…
For the synthesis of a fat: 1. Box around the $H$ from glycerol's $-OH$ group and the $OH$ from the fatty - acid's $-COOH$ group for each of the three reactions. 2. The structural…
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determine the quantity of bromine atoms in 18.0 grams of hgbr₂
$6.02\times 10^{22}$
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select the text from the paragraph that best helps you understand that …
"ushered in an era of greater awareness, leading people to start thinking more carefully about the environmental impact of chemical products"
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select the text from the paragraph that best helps you understand that …
Proponents of DDT usage pointed to the pesticide as a cost - effective means of controlling mosquito populations in parts of the world with high malaria rates
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question 11. use the periodic table to identify the group number and pe…
| Element Name | Group Number | Period Number | | ---- | ---- | ---- | | Neon | 18 | 2 | | Rubidium | 1 | 5 | | Iron | 8 | 4 | | Phosphorus | 15 | 3 | | Lead | 14 | 6 | | Hydrogen…
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question 9. which of the following symbols does not match the element n…
Mg, manganese
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protons: neutrons: electrons: what is the mass number? 0
2
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stion 8. use the periodic table to complete ollowing table with the mis…
| Element Name | Element Symbol | | ---- | ---- | | Mercury | Hg | | Strontium | Sr |
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question 7. in the modern periodic table, elements are arranged in orde…
atomic number
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question 6. the horizontal rows are called. there are in the periodic t…
The horizontal rows are called periods. There are 7 periods in the periodic table.
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protons: neutrons: electrons: find the element: is it: neutral atom ion
The element is Hydrogen (H). It is an ion.
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question 5. elements labeled with “a” are referred to as elements becau…
A. transition
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question 4. elements within a group have chemical and physical properti…
similar
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question 3. the vertical columns of the periodic table are called
Groups
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question 2. the letter of an element symbol is a letter , while the let…
first; capital; second; lowercase
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4. the compounds below give a purple color with iron(iii) chloride solu…
The circled parts in the provided structures are the phenolic - OH groups (the - OH groups directly attached to the aromatic rings) as they are responsible for the purple - color …
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question 1. the is an arrangement of elements in which the elements are…
D. periodic table
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osmium has a density of 22.6 g/ml. what volume, in ml, would be occupie…
54.4248
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question 23 1 point how many oxygen atoms are in 85.0 milligrams of caf…
D. 5.28E20 atoms
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13.) there are 88 naturally occurring elements and from those naturally…
There are more minerals than naturally - occurring elements because different combinations and arrangements of the 88 naturally - occurring elements under various geological condi…
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question 22 1 point there is typically a 0.15 mg dose of epinephrine in…
A. 4.9E17 molecules
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question 21 1 point your average cup coffee contains 1.15e2 mg of caffe…
C. 5.93E-4 moles
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calculate the percentage by mass, of carbon in albuterol, c₁₃h₂₁no₃. gi…
A. 65.3%
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question 4 of 16 > methyl isocyanate, shown as resonance structure 1, c…
Resonance structure 2: $H_3C - N^-=C=O^+$; For resonance structure 1, curved arrow from oxygen lone - pair to C - O to form double bond and from C - N double bond to N. For resona…
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les iroquoiens ont une organisation politique élaborée. choisissez, dan…
Clan : Chef de clan Village : Élus Nation : Sachems Confédération : Sachems des nations
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8) valence electrons: using the periodic table, fill in the missing inf…
| Element Name | Element Symbol | Total # of Electrons | # of Valence Electrons | Gain/Lose Electrons? | Ionic Charge | Lewis Structure | | ---- | ---- | ---- | ---- | ---- | ----…
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7) identify the sections of the periodic table a) b) c) d) e)
a) Alkali metals b) Alkaline - earth metals c) Transition metals d) Halogens e) Noble gases
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identify the groups and periods on the periodic table below.
Groups are the vertical columns and periods are the horizontal rows on the periodic table.
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5) determine the following information from the atom symbols: protons? …
For $_{20}^{42}Ca$: Protons: 20 Electrons: 20 Neutrons: 22 Mass #: 42 Atomic #: 20 Charge: 0 Atom, ion, or isotope: Isotope For $_{12}^{24}Mg^{2+}$: Protons: 12 Electrons: 10 Neut…
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11. write a chemical formula that shows 3 molecules of water:
$3H_2O$
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4. fill in the missing information in the data table below. then, using…
For $_{20}^{42}Ca$: Protons: 20 Electrons: 20 Neutrons: 22 Mass #: 42 Atomic #: 20 Charge: 0 Atom, ion, or isotope: Isotope For $_{12}^{24}Mg^{2+}$: Protons: 12 Electrons: 10 Neut…
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10. use the chemical formula below to complete the missing information.…
# of molecules: 4 # of elements: 3 Name of element: Aluminum, # of atoms: 8 Name of element: Carbon, # of atoms: 12 Name of element: Oxygen, # of atoms: 36 Total # of atoms: 56 Th…
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who first used the word “atomos” to describe the smallest unit of a sub…
B. Democritus
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9) 3mgcl2 coefficient: ____________ subscript for mg: ____________ subs…
coefficient: 3 Subscript for Mg: 1 Subscript for Cl: 2
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4) fill in the missing information in the data table below. then, using…
| Element | Atomic Number | Mass Number | # of Protons | # of Neutrons | # of Electrons | Atom/Ion/Isotope | Atom Symbol | |---|---|---|---|---|---|---|---| | Potassium | 19 | 39 …
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an atoms emission of light with a specific amount of energy confirms th…
electrons emit and absorb energy based on their position around the nucleus.
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the scattering of a stream of positively charged particles when strikin…
The positive charge in an atom must be located in a dense central mass.
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atoms & the periodic table review 1 label each part of the atom 2 name …
1. Since the picture of the atom is not clear - labeled, I'll provide general answers for parts of an atom: - a) Nucleus (contains protons and neutrons). - b) Proton (positively -…
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8. in what family would each of these elements be classified? radium - …
Radium - 2, Iodine - 7, Cesium - 1, Barium - 2, Lead - 4, Bismuth - 5
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part c: balance each of the following equations following the procedure…
$4P + 5O_2=P_4O_{10}$ $2Mg+O_2 = 2MgO$ $2HgO=2Hg + O_2$ $2Al_2O_3 = 4Al+3O_2$ $BaCl_2 + H_2SO_4=BaSO_4 + 2HCl$
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12 multiple choice 0.1 points a buser poured some cleaner from its orig…
Label the working container with the chemical's common name.
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balancing equations practice part a: identify the following parts of ea…
For $H_2$: coefficient 1, sub - script of H is 2; for $2HCl$: coefficient 2, sub - script of H is 1 and Cl is 1; for $4O_2$: coefficient 4, sub - script of O is 2; for $CH_4$: coe…
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which elements had complete outer shells? give the name and symbol for …
1. Noble gases have complete outer - shells. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn). They are in Group 18. 2. Alkali metals have one valence elec…
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what is a chemical equation? it’s how we describe chemical reactions, u…
1. 4 2. 3 3. 6 4. 2 5. 4 6. 6 7. Yes
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h₂co₃ → h₂o + co₂ • how many atoms of hydrogen are in the reactant (tot…
- How many atoms of Hydrogen are in the reactant (total)? 2 - How many atoms of Carbon are in the reactant (total)? 1 - How many atoms of Oxygen are in the reactant (total)? 3 - H…
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h₂co₃ → h₂o + co₂ • how many atoms of hydrogen are in the reactant (tot…
- How many atoms of Hydrogen are in the reactant (total)? 2 - How many atoms of Carbon are in the reactant (total)? 1 - How many atoms of Oxygen are in the reactant (total)? 3 - H…
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c₃h₈ + 5o₂ → 3co₂ + 4h₂o • how many atoms of carbon are in the reactant…
- How many atoms of Carbon are in the reactant (total)? 3 - How many atoms of Hydrogen are in the reactant (total)? 8 - How many molecules of $O_2$ are in the reactant? 5 - How ma…
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3. when silver nitrate and sodium iodide were mixed, a white precipitat…
The precipitate is silver iodide.
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match the scientists with the correct atomic models. ernest rutherford …
Ernest Rutherford - central nucleus with electrons that orbit at a distance J.J. Thomson - electrons mixed in a positive sphere, also called the plum pudding model Democritus and …
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part 3: independent work try balancing these more complex equations. sh…
1. C3H8+5O2→3CO2+4H2O 2. 2KClO3→2KCl+3O2 3. 3Ca(OH)2+2H3PO4→Ca3(PO4)2+6H2O
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22) omar is running a chemical reaction that can be modeled by a quadra…
Approximately 10.02 minutes
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whenever you reach a stop and jot question in the stemscopedia, stop an…
1. No. 2. Yes. An element has a single - atom chemical symbol, while a compound has a formula with multiple elements. 3. Elements have one type of atom; compounds have two or more…
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3. al+cl2→alcl3 work: answer: 4. n2+h2→nh3 work: answer:
3. $2Al + 3Cl_2=2AlCl_3$ 4. $N_2+3H_2 = 2NH_3$
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lattice energy is a measure of ionic - bond strength. the lattice energ…
Iodide ($I^-$)
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ionic crystals find use in the frequency manipulation of laser light. o…
Lithium ion
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the manufacture of many materials essential to engineering requires ver…
$BaO < CaO < MgO$ (lowest melting - highest melting)
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part 2: practice balance these equations. show your work (atom counts, …
1. $2H_2+O_2 ightarrow2H_2O$ 2. $4Fe + 3O_2 ightarrow2Fe_2O_3$
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the coulombic forces that hold the ions together in an ionic solid are …
Bromellite - $Ba^{2+}O^{2 - }$
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8. the story could be read as an allegory, a story in which people, obj…
| Character | What he or she loses/wastes | What happens when she/he is given a second youth | What he or she might represent | |--|--|--|--| | Mr. Medbourne | Wealth | Schemes to…
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the coulombic forces that hold the ions together in an ionic solid are …
$AlF_3$
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ionic solids are often water soluble, because the ions solvate very wel…
C (diamond), SiO₂, NiO
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ionic solids are often very strong materials, such as minerals and rock…
They have many positive and negative charged ions.
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ionic solids can be used to transport ions, since they are composed of …
The two atoms have very different electronegativities.
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2. do you think the property of magnetism is a physical property or a c…
4. Melting ice: Chemical composition remains same, only state changes. Tearing paper: Chemical makeup unchanged, physical form altered. Dissolving salt in water: Chemical identiti…
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4) draw the lewis dot diagram for the following elements. then draw the…
Lewis Dot Diagrams: - $Ca^{2+}$: No dots. - F: 7 dots around F. - $Li^{+}$: No dots. - N: 5 dots around N. Bohr Diagrams: - $Ca^{2+}$: 3 shells with 2, 8, 8 electrons. - F: 2 shel…
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balancing chemical equations assignment part 1: key concepts reactant p…
Reactant: A substance in a chemical reaction that changes. Product: A substance formed in a chemical reaction. Coefficient: A number before a chemical formula in a balanced equati…
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determine the mass in grams of 2.91 moles of licl
123
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daltons theory was identified using light microscope images of atoms. t…
water vapor and air experiments.
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stemscopedia: stop and jot whenever you reach a stop and jot question i…
1. Yes, a new substance is created when a cake is baked. 2. Magnetism is a physical property because it can be observed without changing the chemical identity of a substance. 3. P…
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hydrogen reacts with fluorine to produce hydrogen fluoride. the diagram…
b.
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samantha and her team are looking for ways to improve the results of th…
A. Create a social voice and tone guide.
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hair loss is a side effect of which of the following types of cancer tr…
D. chemotherapy and radiation
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in your own words, describe how matter is identified.
Matter is identified by its physical properties (e.g., color, density, melting - point) and chemical properties (e.g., reactivity with other substances).
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treats cancer by removing it. please select the best answer from the ch…
C. Surgery
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5. sep analyze data classify electron dot structures for molecules with…
H₂CO: trigonal planar SO₂: bent CH₃F: tetraédrica NH₃: trigonal piramidal BeF₂: lineal
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choose the statement below that is not true about early earth’s atmosph…
The ozone layer was quite thick.
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level 2 q3 what is the tendency of a substance to undergo a chemical re…
B. Reactivity
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which of the following is an example of an effort to address urban spra…
A small city maintains a park and forest within its downtown as new businesses build around it.
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level 2 q3 what is the tendency of a substance to undergo a chemical re…
B. Reactivity
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2. sep construct explanations describe and explain one factor that you …
# Explicación breve: Estos compuestos son compuestos moleculares. No se disocian en iones en agua. Los iones son necesarios para la conducción de electricidad en disolución. Sin d…
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what is the ability of a substance to change into something else? a che…
A. Chemical property
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level 1. q3 what is the measure of the amount of matter in a substance …
D. Mass
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what is the ability of a substance to burn or ignite, causing fire or c…
C. Flammability
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question # 5 multiple choice which of these is not a part of the art di…
hiring actors for a television commercial
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physical properties can be observed and measured without changing the s…
D. All of the above
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colonel killigrew enjoyed the sensual pleasures of life torments of sou…
7. Dr. Heidegger reminds his guests to use the water of youth with moderation and remember the lessons of their past lives. 8. Widow Mycherly: Vanity; Mr. Gascoigne: Political Amb…
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bean bag (bg) average atomic mass (amu) atomic mass = (avg.mass$_{isoto…
It depends on experimental errors, sample consistency, and calculation accuracy. If errors are low and samples are similar, values will be close; if not, they could be very differ…
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alisha organizes her data about the element lead into a table. |quantit…
Solid at room temperature
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3. sep calculate the percent abundance of each isotope: divide the numb…
Limium Relative Abundance: 0.47951 Kidnium Relative Abundance: 0.2235 Peaium Relative Abundance: 0.1415 Navium Relative Abundance: 0.135
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highlight the piece of evidence that best supports the claim. claim: at…
There are also just as many electrolytes, electrically charged chemicals that help muscles function, in chocolate milk as there are in popular sports drinks like Gatorade and Powe…
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bena thinks that dissolving more salt in water causes the mixtures free…
an experimental investigation, because it allows for the control of variables
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write a paragraph comparing and contrasting how the poets use topic, rh…
(Paragraph -) Poem A focuses on the beauty of a sunset as its topic, using an ABAB rhyme scheme that gives it a smooth, flowing rhythm. The poet uses metaphors like "the sun is a …
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3. titanium has five common isotopes with the 8.0% ti - 46, 7.8% ti - 4…
$47.923$
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atoms and elements name royal grade 8th 1.draw and label two atom model…
1. Hydrogen atom model: A small nucleus with 1 proton (marked as 'p') and no neutrons (or can mark 0 if preferred). One electron (marked as 'e') in the first electron - shell. Car…
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read the passage about the health risks of single - load liquid laundry…
Studies performed by the CPSC give reliability to the results of improved safety obtained by each soap company.
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question 10 (10 points) listen what is the structure of 1 - chloro - 3 …
The correct structure is the one where there is a 7 - carbon chain with a C=O at the second carbon, a $-Cl$ at the first carbon and an ethyl group ($-CH_2CH_3$) at the third carbo…
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what products are formed when the acetal below is hydrolyzed with water…
The first option: $\ce{H - C(=O)-CH_2CH_2CH_2CH_3 + 2CH_3OH}$
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10) put a checkmark next to the description if it describes an element,…
It has one chemical symbol: Element Its chemical formula can include different chemical symbols: Compound It is made of bonded atoms: Compound It is considered a pure substance: B…
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what product is formed when the compound below is oxidized with k₂cr₂o₇…
The second option: $\mathrm{CH_3CH(CH_3)CH(Br)COOH}$