化学
化学反应、化学计量、分子结构与元素性质。
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after the transfer of electrons, calcium becomes an ion with a charge o…
+2; -2
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a calcium atom has type here valence electrons. it needs to transfer ty…
2; 2; 6; 2
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a chemist is using 337 milliliters of a solution of acid and water. if …
46.5
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if the following arithmetic operations are carried out, how many signif…
2
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which orbital designation would be allowed for one subshell containing …
Question 1: C. 5d Question 2: D. Ag
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question 5 (0.5 points) listen how many total orbitals are possible for…
B. 4
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the model below shows a carbide ion. what could be done to change this …
remove 4 electrons
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4. a student doing an experiment wants to dispose of salt and sugar tha…
Flush them with water down the drain.
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3. what should be done if acid is accidentally splashed on bare skin? (…
Flush the affected area with lots of water
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2. in which situation should gloves be worn in the laboratory? when che…
When chemicals that can damage the skin are being used
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multiple choice 10 points which statement describes the structure of a …
7. It is composed of two hydrogen atoms covalently bonded to a central oxygen atom. 8. The tetrahedral structure around oxygen forces the hydrogen atoms to form an angle.
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apply medical terminology for each specialty 5 of 5. in the term intrac…
1. within 2. ischemic stroke
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apply medical terminology for each specialty 0 of 5. which of the follo…
C. embolic stroke D. thrombotic stroke
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why couldnt mendeleev organize the entire table during his research? th…
Some elements were undiscovered at the time.
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what is one way to describe elements? they break down easily. they are …
They are the building blocks of matter.
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what happens when nitrogen fills its valence shell? ○ three electrons a…
Three electrons are gained, creating $N^{-3}$
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what are groups 1, 2, and 3 examples of on the periodic table? metalloi…
C. metals
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select a word from the drop - down menu to correctly complete the state…
Group
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1) calculate the number of valence electrons in methylene chloride, ch2…
1) 24 2) A. :$\ddot{Cl}$—$\overset{H}{\underset{H}{C}}$—:$\ddot{Cl}$:
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1) calculate the number of valence electrons in methylene chloride, ch₂…
1. 24 2. A.
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question 5 of 10 you have a graduated cylinder that you use to measure …
D. 35.5 ml
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question 3 of 10 a student measured the density of gold to be 18.5 g/cm…
B. 4.15%
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substance normal 1000x 10,000,000x classification (check all that apply…
mixture, solution, homogeneous mixture
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the severe secondary osteoarthritis that follows aseptic necrosis of th…
collapse of underlying subchondral bone
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the descriptions below of two substances and an experiment on each. dec…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
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read the descriptions below of two substances and an experiment on each…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
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distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? pure substance Is sample B made from a pure substance or a mixture? mixture
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distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
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read the descriptions below of two substances and an experiment on each…
Is sample A made from a pure substance or a mixture? (can't decide) Is sample B made from a pure substance or a mixture? mixture
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distinguishing mixtures from pure substances through physical propertie…
Is sample A made from a pure substance or a mixture? mixture Is sample B made from a pure substance or a mixture? mixture
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general chemistry i aleks - session closed aleks - cristabel cortez - l…
Is sample A made from a pure substance or a mixture? - mixture Is sample B made from a pure substance or a mixture? - mixture
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an ebony carving has a mass of 273 g and a volume of 207 cm³. express y…
Density of tin: $7.27\ g/cm^{3}$; Density of ebony: $1.32\ g/cm^{3}$
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incorrect your answer is incorrect. list these electron subshells in or…
5p, 6s, 4f, 6p
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some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | location of elements (blocks) | metals or nonmetals? | | ---- | ---- | ---- | | [G]$ns^{2}md^{10}np^{2}$ | p | nonmetals, metalloids | | [G]$ns…
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consider the following data for iodine: | atomic mass | $126.90\frac{g}…
1. absorb 2. yes 3. \(1008.4\) 4. release 5. yes 6. \(1008.4\)
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consider the following data for nickel: | | | |--|--| | atomic mass | 5…
(1) absorb, yes, $112$ (2) release, yes, $112$
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section 4.3 how atoms differ in your textbook, read about atomic number…
1. False 2. False 3. False 4. True 5. False
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while mechanical solidarity occurs when people tend to do the same type…
is a social order based around an acceptance of economic and social differences
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according to emile durkheims theory of organic solidarity arises out of…
A. arises out of the mutual interdependence created by the specialization of work, allowing for diversity of values
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can cause temporary changes in which of the following? speech balance b…
transient ischemic attack
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question 16 of 20 which term refers to the energy an object has due to …
D. Chemical energy
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question 13 of 20 which process is a change from liquid to gas? a. melt…
D. Vaporization
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question 12 of 20 which best describes nuclear energy? a. the energy th…
B. The energy stored inside the center of an atom
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1/19 rhyme scheme 1 the attitude the poems narrator (this may or may no…
The pattern of rhymes within a poem. It is labeled with the letters of the alphabet.
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a star is mainly made of hydrogen gas, but most classes of stars includ…
True
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complete the sentence with the pronoun that agrees with the word or wor…
her
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nick hypothesizes that wax has a higher melting point than chocolate. h…
A. Heat equal masses of wax and chocolate and measure their temperatures when they start to melt.
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read the passage from \the lady, or the tiger.\ it mattered not that he…
the wisdom of a good leader
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4.) there are ____ moles in 9.01 x 10^23 molecules of water. (1 point) …
A. 1.50
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10.2 conversions between moles and atoms 1.) what is the mass of 5.119 …
1. D. 135.7 g 2. C. 1.31 mol Fe 3. B. 0.166 mol
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what are the molecular and empirical chemical formulas of a compound ma…
Molecular formula: $C_{2}H_{4}O_{2}$ Empirical formula: $CH_{2}O$
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a penny has a mass of 2.50 g and the moon has a mass of 7.35×10²² kg. u…
$49$
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question 8 what abbreviation represents oxygen? a co2 b n2 c o2 d h2o
C. O2
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4.) avogadros number of particles in a mole holds true for ____. (1 poi…
4. D. All of the above 5. A. $6.022\times 10^{23}$
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3.) what is the smallest representative particle of an element? (1 poin…
A. atom
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2.) the representative particle for gaseous nitrogen is the ____. (1 po…
B. molecule
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1.) what is the si unit that refers to the number of particles containe…
A. mole
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consider the following data for iodine: | | | |--|--| | atomic mass | 1…
For reaction (1): absorb, yes, \(1008.4\ kJ/mol\) For reaction (2): release, yes, \(1008.4\ kJ/mol\)
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18 how many neutrons are in the tungstan - 185 isotope? * (0.5 points) …
18: 111 19: 18
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who discovered the nucleus of an atom? * (0.5 points) dalton thompson r…
1. C. Rutherford 2. 23 3. 92
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which of the following is the correct notation for an atom with 35 prot…
1. $_{35}^{79}Br$
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which statement is correct for the ion with the nuclear symbol * (0.5 p…
It has 18 neutrons and 18 electrons.
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13 which statement is correct for the ion with the nuclear symbol * (0.…
It has 17 protons and 18 electrons. (None of the given options are correct based on the above - derived values. If we assume there is a mis - typing in the options and we focus on…
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13 which statement is correct for the ion with the nuclear symbol * (0.…
It has 18 neutrons and 18 electrons.
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some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | location of elements (blocks) | metals or nonmetals? | | ---- | ---- | ---- | | $[G]ns^{2}of^{7}md^{1}$ | d, f | metals | | $[G]ns^{2}mf^{11}$ …
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12 which statement is correct for the atom with the nuclear symbol * (0…
It has 8 protons in its nucleus.
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all neutral atoms of the same element contain equal numbers of protons …
True ### Question 11
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some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | blocks | metals or nonmetals? | | ---- | ---- | ---- | | [G]$ns^{2}of^{7}md^{1}$ | d, f | metals | | [G]$ns^{2}mf^{11}$ | f | metals | | [G]$ns…
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copper (symbol cu) has two naturally occurring isotopes, cu - 63 and cu…
Percent abundance of Cu - 63: 72.5% Percent abundance of Cu - 65: 27.5%
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which is correct for isotopes of the same element? * (0.5 points) isoto…
1. Isotopes of the same element have the same atomic number but a different mass number. 2. Sr - 88
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4 isotopes of the same element have identical (a) properties but differ…
For 4: Chemical For 5: Physical
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use the data in the table to calculate the relative atomic mass of tita…
$47.92$
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silver has two naturally occurring isotopes; ag-107 and ag-109. the rel…
$56.5\%$
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calculate the relative atomic mass of gallium to two decimal places. be…
$69.80$
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incorrect your answer is incorrect. • row 1: your answer is incorrect. …
| electron configuration of atoms | location of elements (check all that apply) | | |--|--|--| | | blocks | metals or nonmetals? | | \([G]ns^{2}md^{10}np^{2}\) | p | metalloids | …
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question 5: remember, on the actual exam, you cant search google images…
a) Resonance structures for ozone ($O_3$): $O = O - O$ and $O - O = O$ b) Resonance structures for $COOH^-$: $O = C - O^-$ and $O^- - C = O$ c) Resonance structures for $NCS^-$: $…
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jakobs bravery l han jakobs mom told him that laughing was not the way …
A. It makes the reader pause on Jakob's bravery.
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question 19 1 pts ______ is the systematic denial that racism exists, a…
Question 19: D. Colorblind racism Question 20: A. A microaggression
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a. what is the difference between an intermolecular and intramolecular …
a. Intermolecular forces are between molecules; intramolecular forces are within a molecule. b. London - dispersion, dipole - dipole, hydrogen bonding, covalent, ionic. c. Below 1…
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potassium chromate express your answer as a chemical formula. a chemica…
Potassium chromate: $K_2CrO_4$ Copper(I) fluoride: $CuF$
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copper(i) chloride express your answer as a chemical formula. a chemica…
Part A: $CuCl$ Part B: $Fe(IO_3)_2$
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correct for an ionic compound containing a polyatomic cation and a mono…
Part C: sodium bromate Part D: iron(III) hydroxide
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ba(oh)₂ spell out the full name of the compound. part b nh₄f spell out …
Part A: Barium hydroxide Part B: Ammonium fluoride
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part c crf₂ spell out the full name of the compound. part d crcl₂ spell…
Part C: Chromium(II) fluoride Part D: Chromium(II) chloride
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part a sno₂ spell out the full name of the compound. submit request ans…
Part A: tin(IV) oxide Part B: mercury(I) iodide Part C: chromium(II) fluoride
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part c enter the compound that forms between sodium and hydrogen phosph…
Part C: $Na_2HPO_4$ Part D: $NaC_2H_3O_2$
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enter the compound that forms between sodium and carbonate. express you…
Part A: $Na_2CO_3$ Part B: $Na_3PO_4$
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potassium and oxygen express your answer as a chemical formula. a chemi…
Part A: $K_2O$ Part D: $BaBr_2$
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cesium and chlorine express your answer as a chemical formula. a chemic…
Part A: CsCl Part B: $Ca_3N_2$
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give the systematic name for the compound al(no3)3. spell out the full …
Aluminum nitrate Iron(III) sulfate BaO
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classify each of the following compounds as ionic or molecular. drag th…
Molecular: $CF_2Cl_2$, $CO$, $NI_3$ Ionic: $KMnO_4$, $Pb(NO_3)_2$
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classify the following compounds as having covalent or ionic bonds. dra…
Covalent bonds: sulfur trioxide, phosphorus trichloride Ionic bonds: strontium iodide, barium chloride, aluminum sulfide, potassium iodide
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which of the following would you expect to be a molecule and which woul…
Molecular: SO, CO, HCl Ionic: KF, CaS, KCl, NaI, MgO
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an eifs assembly may consist of all of the following except plywood she…
1. C. metal lath 2. A. is associated with water moving through masonry walls
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co₂(g) + casio₃(s) + h₂o(l) → sio₂(s) + ca(hco₃)₂(aq) express your answ…
$CO_2(g)+CaSiO_3(s)+H_2O(l) ightarrow SiO_2(s)+Ca(HCO_3)_2(aq)$
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section 4.1 early ideas about matter in your textbook, read about the p…
1. False 2. True 3. True 4. True 5. False 6. False 7. True 8. True 9. False 10. True
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bonds quick check how many covalent bonds is nitrogen (group 5a) likely…
A. three
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bonds quick check which kind of bond would occur between sodium (na, gr…
A. Ionic
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bonds quick check between which types of elements do ionic bonds occur,…
metals and nonmetals, electrons transferred
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bonds quick check metallic bonds are responsible for many properties of…
The bonds can shift because valence electrons are held loosely and move freely.