化学
化学反应、化学计量、分子结构与元素性质。
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how many covalent bonds can carbon form with other atoms? one four two
Four
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18. why was there significant opposition to the fugitive slave act? bec…
Because it was used to provide federal support for the institution of slavery
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in the periodic table below, shade the p - block elements.
Shade the following elements: B, C, N, O, F, Ne, Al, Si, P, S, Cl, Ar, Ga, Ge, As, Se, Br, Kr, In, Sn, Sb, Te, I, Xe, Tl, Pb, Bi, Po, At, Rn.
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write the electron configuration for a neutral atom of antimony.
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p³
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part 2 (everyone): parts of an atom instructions: identify each compone…
Protons: In the nucleus, charge = + 1. Neutrons: In the nucleus, charge = 0. Electrons: In electron - shells, charge=- 1.
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complete the following: 1. for each of the ions listed, identify the to…
1. 10 2. 23 3. 12 (should be Mg²⁺, actual is 10) 4. 48 5. 29 6. 26 7. 2 8. 21 9. 38 (should be Rb⁺, actual is 36) 10. 76
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complete the table below by writing | ionic compound | cation | anion |…
| ionic compound | cation | anion | | ---- | ---- | ---- | | $Mn_2S_3$ | $Mn^{3+}$ | $S^{2 - }$ | | $MnCl_4$ | $Mn^{4+}$ | $Cl^{-}$ | | $ZnBr_2$ | $Zn^{2+}$ | $Br^{-}$ | | $MnI_2$…
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solid potassium reacts with chlorine gas to produce solid potassium chl…
$2K + Cl_2 ightarrow2KCl$
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decide whether each pair of elements in the table below will form an io…
strontium and lithium: no, sodium and fluorine: yes, $NaF$ sulfur and chlorine: no, bromine and barium: yes, $BaBr_2$
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9 multiple choice 10 points - which does not correctly describes an ato…
A. 6 electrons
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name yulina t date _ hour _ 4. complete the following chart: isotope na…
| Isotope name | atomic # | mass # | # of protons | # of neutrons | # of electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | boron - 10 | 5 | 10 | 5 | 5 | 5 | | boron - 11 |…
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3. what element determines if a molecule is organic or inorganic?
Carbon
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multiple choice 10 points 1 which distinguishes an atom of one element …
2. The number of protons in the atomic number
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7 multiple choice 10 points why would this diagram be considered a corr…
A. This diagram has 5 protons, 5 electrons, and 6 neutrons.
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the chemical formula for hydrogen fluoride is hf. a chemist determined …
0.60 g
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10. in nature, 94.72% of all bromine exists as bromine - 80, 2.82% exis…
Average atomic mass of bromine: 79.9035 Average atomic mass of sulfur: 32.066 Electrons in $Cr^{+3}$: 21 Electrons in $Mg^{+2}$: 10 Electrons in $Pt^{+2}$: 76 Electrons in $Co^{+3…
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choose the word that does not belong. * chemist architect astronaut nav…
Amateur
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question 1 - 6 what property of water allows it to be a versatile solve…
C. polarity
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choose the word that does not belong. * barbecue biscuit raisins chemic…
Chemical
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how can an atom of fluorine (f) be described? neutrons no answers chose…
Neutrons: 10, Atomic Number: 9, Atomic Mass Number: 19
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in colder climate regions, lakes and ponds freeze in the winter. the so…
Water molecules arrange themselves in a structure with more space between them, making the ice less dense and causing it to float.
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4. the atomic number of an atom is equal to the number of _____________…
4. Protons 5. Sum of protons and neutrons 6. |Nuclear Symbol|Atom - Mass Name|Atomic #|Mass|Protons|Neutrons|Electrons| |----|----|----|----|----|----|----| |$^{80}_{35}Br$| - |35…
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5 multiple choice 10 points which distinguishes an atom of one element …
5. B. the number of protons in the atomic number 6. C. (with 3P, 4N, and electrons: 2 in inner shell, 1 in outer shell)
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according to the physical properties chart, what are the properties of …
Ionic Compounds: Higher melting and boiling points, hard - brittle solids, often high water solubility, conduct electricity when dissolved in water, always solids (e.g., NaCl, MgO…
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3. categorization 10 points which subatomic particle(s) are responsible…
proton + neutron
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multiple choice question what is a correct description of hydrogen bond…
The partial positive charge of a hydrogen atom attracts the partial negative charge of an oxygen atom on an adjacent molecule.
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which of the following was a deadly new innovation introduced by the hi…
B. Horse - drawn chariot
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multiple choice question in a single covalent bond, ______ of electrons…
C. 1 pair; 2 pairs
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multiple choice question what type of bond forms between opposite parti…
A. hydrogen
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multiple choice question what describes a covalent bond? atoms share a …
Atoms share a pair of electrons.
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multiple choice question. the o - atom in the oxygen atom in the water …
electrons
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one word in the sentence is misspelled. click on it, and then spell it …
The misspelled word is "liesure", and the correct spelling is "leisure".
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fill in the blank question a type of chemical bond called a(n) bond for…
ionic
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when two atoms with a similar electronegativity share electrons, a(n) _…
nonpolar covalent
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what is an attractive force that holds atoms in a molecule together? o …
D. chemical bond
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2 categorization 10 points which subatomic particle(s) are responsible …
proton
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a covalent bond where there is unequal sharing of electron pairs is cal…
B. polar
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an atoms ______ is a measure of its ability to attract electrons. o sol…
electronegativity
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a ____ covalent bond shares the highest number of electron pairs. o sin…
C. triple
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multiple choice question an atom is most stable when its outermost elec…
A. valence
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multiple choice question a type of chemical bond called a(n) ______ bon…
covalent
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multiple choice question the picture shows the electron ______ of hydro…
energy shells
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what type of bond is formed from the attraction of two ions with opposi…
C. ionic
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multiple choice question an electron orbital is o the path around the n…
a region where an electron is likely to be located.
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element numbers ws use your element number notes to answer the question…
A. they contain more neutrons than protons
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multiple choice question two or more atoms are held together in a molec…
A. bonds
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multiple choice question when two or more atoms are chemically joined t…
D. molecule
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question 20 of 26 how did advancements in technology help bring a quick…
D. The United States' use of atomic bombs forced Japan into immediate surrender.
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multiple choice question the electronegativity of an atom is a measure …
electrons
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multiple choice question the outermost occupied electron energy shell o…
A. valence
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multiple choice question the second energy shell of an oxygen atom can …
8
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fill in the blank question in an atom, each individual electron orbital…
2
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multiple choice question what is a molecule? one or more atoms bonded t…
one or more atoms bonded together
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number the elements sodium, magnesium, phosphorus, and chlorine in the …
4. sodium 3. magnesium 2. phosphorus 1. chlorine
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true or false: an isotope is an atom of the same element that contains …
False
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multiple choice: calculate the atomic mass of beanium. use the table, e…
C. 27.30 grams
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multiple choice: what is the sum (total) of the number of beans? isotop…
$341$ atoms
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multiple choice: what is the sum (total) of the number of beans? isotop…
341 beans
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the arcade looked nothing like how cory had imagined. it did not match …
D. schema
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when karen saw the doughnuts in the bakery section of the store, she re…
C. semantic network
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enrique made a list of things he needed from the store. he listed all o…
B. conceptual hierarchy
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which element is most commonly found in the atmosphere as a gas? phosph…
Nitrogen
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11. what intellectual influences in primary documents—such as the magna…
The Magna Carta's concepts of rule - of - law and limitations on power, and the English Bill of Rights' definition of citizen rights and government powers influenced the creation …
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lets check in a ________ is a multilevel way of grouping items based on…
B. conceptual hierarchy
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are three ways of organizing concepts. a hierarchies, concepts, and cat…
D. Conceptual hierarchies, schemas, and semantic networks
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18 ar argon 39.95 protons: neutrons: electrons:
Protons: 18 Neutrons: 22 Electrons: 18
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electrons: _ neutrons: _ protons: _ silicon si 14 28.09
Electrons: 14 Neutrons: 14 Protons: 14
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protons: neutrons: electrons:
Protons: 78 Neutrons: 117 Electrons: 78
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of each subatomic particle. 8 o oxygen 15.99 protons: neutrons: electro…
Protons: 8 Neutrons: 8 Electrons: 8
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lecture - practice ent below, identify the amount of ea 3 li lithium 6.…
Neutrons: 4 Electrons: 3
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7) which particle is this? protons 8) what charge does it have? positiv…
10) Helium 11) 2 12) 2 13) 35 14) 7
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atomic structure - practice problems instructions: for each element bel…
| Element | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | | O | 8 | 8 | 8 | | Ar | 18 | 22 | 18 | | Si | 14 | 14 | 14 | | Pt | 78 | 117 | 78 |
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excerpt from a journey to the center of the earth by jules verne lookin…
D. The narrator appeases his uncle's whims.
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which statement is the most effective claim? organic foods are a health…
Organic foods are a healthier option than conventional foods.
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what evidence do scientists use to explain how the solar system formed?…
C. All the planets orbit in an elliptical pattern in the same direction
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of elements from period 3 and group 17. number the elements sodium, mag…
1. potassium 2. sodium 3. magnesium
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question 2 of 10 an engineer that designs buildings is a(n) a. civil en…
A. civil engineer
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question 10 of 10 in which group do most of the elements have 8 valence…
C. Noble gases
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question 9 of 10 which element would you expect to behave the most like…
D. Germanium (Ge)
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question 8 of 10 which of the following is a characteristic of the lant…
A. They are silvery metals that conduct electricity.
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question 7 of 10 which group is in the second column of the periodic ta…
B. Alkaline earth metals
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question 6 of 10 which of the following is a characteristic property of…
A. They do not react chemically.
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question 5 of 10 which of the following is an alkali metal? a. krypton …
B. Lithium (Li)
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question 4 of 10 where are the lanthanides and actinides found on the p…
B. Rows 6 and 7, separated from the rest of the table
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question 3 of 10 what is the maximum number of valence electrons an ele…
C. 8
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question 2 of 10 which of the following is a transition metal? a. magne…
C. Chromium (Cr)
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question 1 of 10 how many valence electrons do the alkali metals have? …
C. 1
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children safety test while working with children, you should establish …
6. H. Statute 7. C. Molestation 8. B. Sexual Abuse 9. H. Statute 10. D. Incest 11. G. Non - Accidental Physical Injury 12. A. Neglect 13. F. Emotional Abuse 14. G. Paper 15. G. Cl…
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chemistry sem 1 2.3.2 quiz: organization and history of the periodic ta…
B. 2
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question 9 of 10 how have chemists changed the periodic table over time…
B. They have added new elements to the table.
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chemistry sem 1 ↑ 2.3.2 quiz: organization and history of the periodic …
A. 14
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question 7 of 10 how many valence electrons does b (boron) have? a. 5 b…
B. 3
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question 6 of 10 what arerepresentative elements? a. elements in the sa…
D. Elements in the tall columns of the periodic table
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question 5 of 10 how does the periodic table indicate the number of val…
D. By the group number of the A columns
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question 4 of 10 how did mendeleev arrange the known elements in his pe…
B. According to atomic mass
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question 3 of 10 what do all the elements in one row of the periodic ta…
D. They all have the same number of core electrons
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question 2 of 10 which electrons are the valence electrons of the atom?…
A. The electrons farthest away from the nucleus
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question 1 of 10 why do all the elements in group 16 share similar prop…
A. They all have the same number of valence electrons.
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question 10 of 10 what is an isotope? a. atoms of the same element that…
C. Atoms of the same element that differ in number of neutrons
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question 9 of 10 what charge does an ion have if it has more protons th…
B. A net positive charge