化學
化學反應、化學計量、分子結構與元素性質。
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the bond formed by sharing valance electrons is hydrogen ionic covalent
C. Covalent
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question 6 in this molecule, what does the zig - zag line represent? tr…
carbon - carbon bonds (with as many hydrogens as needed)
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question 5 what functional group is this? carboxyl sodium sulfhydryl
C. sulfhydryl
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what functional group is this?
Thiol
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question 5 what functional group is this? o= c - oh h - c - ch2 - sh h …
For the first part: The molecule is a steroid because of its four - ring structure. For the second part: The functional group highlighted is a thiol (-SH).
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question 4 what is this molecule? steroid phospholipid monosaccharide
A. steroid
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question 3 which reaction builds a polymer? hydrolysis dehydration ques…
Question 3: B. dehydration Question 4: steroid
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multiple - choice question what does the roman numeral tell you? number…
D. charge of transition metal
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question 1 what molecule is this? a fat a polysaccharide a steroid
a fat
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is the image of the molecule below depicting a monomer or polymer?
Monomer
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what is the formula of the ionic compound between fe³⁺ and o²⁻? fe₆o₆ f…
$Fe_{2}O_{3}$
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multiple - choice question what is the charge of iron here? 2- 3+ 3- 2+
B. 3+, D. 2+
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practice: what is the chemical formula of potassium nitride? hint: pota…
C. $K_3N$
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food is digested in the stomach. * this is a physical change this is a …
1. This is a CHEMICAL change 2. This is a CHEMICAL change 3. This is a CHEMICAL change
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fireworks explode. * 1 point this is a physical change this is a chemic…
1. This is a CHEMICAL change 2. This is a PHYSICAL change 3. This is a CHEMICAL change
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grass grows on a lawn. this is a physical change this is a chemical cha…
1. This is a CHEMICAL change 2. This is a PHYSICAL change 3. This is a PHYSICAL change
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alka - seltzer gives off carbon dioxide when added to water. * this is …
1. This is a CHEMICAL change 2. This is a CHEMICAL change 3. This is a PHYSICAL change
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compare a water molecule, h₂o, to a hydrogen peroxide molecule, h₂o₂. w…
Water and hydrogen peroxide are made from the same types of atoms, but combine in different ways.
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the amount of matter in an object is the objects weight molecules volum…
1. D. mass 2. A. The amount of space an object takes up
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details no additional details were added for this assignment. how do at…
by sharing electrons with each other
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what is the smallest part of a compound called? mixture element molecul…
C. molecule
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which choice is not an example of a molecule? o ncl₃ o o₃ o f o h₂o₂
F
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open - ended question name the following: 1 - pb(clo₂)₄ 2 - c₅n₃ 3 - k₂…
1. Lead(IV) chlorite 2. Pentacarbon trinitride 3. Potassium sulfide
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given a formula, you have learned to write the name. given a name, you …
1) Writing FORMULAS for all types of ionic compounds 2) Writing FORMULAS for binary ionic compounds with transition metals 3) Writing FORMULAS for binary ionic compounds with poly…
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given a formula, you have learned to write the name. given a name, you …
1) Writing FORMULAS for all types of ionic compounds
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what is the formula of phosphorus pentachloride? pci p₅cl pcl₅
PCI₅.
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do you need to know the elements charges to write the formula for a cov…
No
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how do you write the name of a covalent compound? 1) write the name of …
1) Write the name of the first element. 2) Write the name of the second element, but change its ending to -ide. 3) Put a number prefix at the beginning of each element name to tel…
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do you need to know the elements charges to write the name of a covalen…
No
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do covalent compounds contain metal ions? no yes
No
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multiple - choice question when do we need parenthesis in the compound …
When there is multiple of 1 polyatomic ion
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what would be the formula of this compound? □ al₂(co₃)₂ □ alco₃ □ al₂(c…
$Al_{2}(CO_{3})_{3}$
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multiple - choice question what charge does ammonium have? +1 +2 -1 -2
+1
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since transition metals can have different charges, how do we figure ou…
Determine the charge based on the anion's charge and charge - neutrality of the compound.
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in your own words, why do we need roman numerals when writing the names…
Roman numerals are used to indicate the oxidation state of transition metals in compounds for clarity and precision in chemical naming.
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why dont we write roman numeral charges for representative elements? re…
Representative elements can only have one charge; transition metals can have two or more different charges.
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the roman numeral written after the name of a transition metal tells ho…
the charge on 1 atom of the transition metal in that particular compound
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elements, compounds, mixtures color by numbers directions: answer each …
1. C. atom (purple) 2. B. molecule (yellow) 3. B. compound (aqua green) 4. A. molecule (sky blue) 5. C. mixture (green) 6. A. molecule (orange) 7. C. mixture (pink) 8. C. at least…
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what is the trend of electronegativity as you go down a group, top to b…
It Decreases
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multiple - choice question the elements on the bottom left of the perio…
A. really DON'T want to get electrons through bonding
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multiple - choice question which element has the highest electronegativ…
Fluorine
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multiple - choice question if an element has an electronegativity of 4.…
really wants electrons
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cu(s) + 4 hno₃(aq) → cu(no₃)₂(aq) + 2 no₂(g) + 2 h₂o(l) a student analy…
1. Approximately $9.4\%$ 2. Approximately $0.344\ M$ 3. $0.01875\ mol$
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multiple - choice question electronegativity is a measure of an atoms _…
B. Attraction
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multiple - choice question which elements on the periodic table have hi…
B. Top Right
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multiple - choice question it is much harder to take an electron from a…
TRUE
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4. another student also expected 2.63 g of product, but isolated only 2…
93.2%
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multiple - choice question ionization energy is the energy needed to __…
A. Remove
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which is the largest atom? smallest atom? largest: francium smallest: f…
Largest: Francium Smallest: Helium
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for period 2 on the periodic table which element has the smallest radiu…
A. Fluorine
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multiple - choice question why does cs have a larger radius than rb? be…
Because Cs has 1 more electron shell than Rb
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multiple - choice question what happens as you move down group 1? elect…
More electron shells are added
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multiple - choice question what does atomic radius measure? the mass of…
The size of an atom
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multiple - choice question what is a \trend\ in chemistry? a fashion ch…
D. A pattern
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which statement about the balanced equations for nuclear and chemical c…
A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.
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which phrase describes transmutation? (1 point) the conversion of an at…
the conversion of an atom of one element into a different element through nuclear changes
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consider the molecule ne₂. part: 0 / 2 part 1 of 2 draw the mo diagram …
A proper MO diagram for Ne₂ should have energy on the y - axis and molecular orbitals labeled on the x - axis. The $\sigma_{1s}$, $\sigma_{1s}^*$, $\sigma_{2s}$, $\sigma_{2s}^*$, …
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the element radium has a mass number of 226 and an atomic number of 88.…
138
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which of these is a common procedural error that could make it seem lik…
B. Losing small amounts of reactant during transfer
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periodic trends practice problems: electronegativity 1. define electron…
1. Electronegativity is the ability of an atom in a chemical bond to attract electrons to itself. 2. Oxygen > Manganese > Germanium > Francium 3. Selenium > Zinc > Vanadium > Tita…
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4 multiple choice 5 points which of the following best describes the la…
Mass remains constant in a closed system, even if substances change form
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are these two substances the same? explain why they are or are not. sub…
No, they are not the same substances because they have different density and melting - point values.
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during a slime - making lab, some students accidentally spill a little …
The mass of products will appear less than the mass of reactants
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11.rank the following elements by decreasing atomic radius: zinc, vanad…
11. Calcium > Vanadium > Titanium > Zinc > Selenium 12. The atomic radius increases as you move from top to bottom within a group. This is because new electron shells are added, i…
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if you mix two substances in a closed container and the reaction produc…
It stays the same
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periodic trends practice problems: atomic radius 1. define atomic radiu…
1. The distance from the nucleus of an atom to its outermost electron shell. 2. Oxygen, Carbon, Aluminum, Potassium 3. Fluorine, Oxygen, Beryllium, Lithium 4. Carbon, Germanium, T…
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1 multiple choice 5 points in a lab where students measure the mass of …
Measuring reactants separately and carefully before mixing
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6. terica is dissolving a substance in a solution for a chemistry exper…
$-\frac{20}{3}$ grams per second
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did you build a biogeochemical cycle? match biogeochemical cycle charac…
1. An element flows through a system - Nitrogen flows through the marine system 2. An element is in organisms and abiotic substances - Nitrogen is in the atmosphere, water environ…
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why should you never eat or drink in the science lab? because it’s mess…
Because food and drinks can become contaminated with chemicals
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draw the lewis structure for the clo₃⁻ ion. predict its geometry and de…
The Lewis structure has Cl as the central atom, single - bonded to two O atoms (each with 3 lone - pairs) and double - bonded to one O atom (with 2 lone - pairs) and overall charg…
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complete the sentence with the word that best fits the overall meaning …
prevalent
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directions for each problem: 1) recognize and record individual element…
1) H: 2, O: 1, total atoms: 3 2) Mg: 1, Cl: 2, total atoms: 3 3) Li: 2, S: 1, O: 4, total atoms: 7 4) Na: 1, C: 2, H: 3, O: 2, total atoms: 8 5) N: 1, H: 4, Cl: 1, total atoms: 6 …
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part 2 of 3 select the single best geometry of clo₃⁻ ion. trigonal plan…
Part 2 of 3: D. Trigonal pyramidal Part 3 of 3: $sp^{3}$
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what are the hybrid orbitals of the carbon atoms in the following molec…
$sp^2$, $sp^3$
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consider the molecule tetracyanoethylene: :n≡c :n≡c c=c c≡n: c≡n: part …
Part 1 of 2: 9 Part 2 of 2: 9
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consider the molecular shape of water (h₂o). select the single best ans…
Part 1 of 2: Bent Part 2 of 2: $sp^3$
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in hybridization in incl₄⁻. select the single best answer. ○ sp² ○ sp³ …
$sp^3$
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identify the hybridization of the in atom in both the reactant, incl₃, …
$sp^{2}$
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a student has samples of two pure compounds, xclo₃ and zclo₃, which con…
A. Which has the greater molar mass, X or Z?
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given the following information, what is the expected order of elution …
D. A, B, C
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predict the geometries of the following ion. sif$_{6}^{2 - }$ part 1 of…
Part 1 of 2: Electron Domain Geometry: Octahedral Part 2 of 2: Molecular Geometry: Octahedral
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using the vsepr model, predict the molecular geometry of scl₄. select t…
seesaw
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a student has two samples of nacl, each one from a different source. as…
A. Which sample has the higher purity?
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using the vsepr model, predict the molecular geometry of po₄³⁻. select …
tetrahedral
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two different ionic compounds each contain only copper and chlorine. bo…
B. What is the formula unit of each compound?
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consider the polarity of the following molecules. part 1 of 2 is the mo…
Polar
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which structure has a dipole moment? neither structure has a dipole mom…
The first structure has a dipole moment.
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the c₂h₂cl₂ molecule can exist in either of the following two forms: pa…
Part 1 of 2: $sp^2$ Part 2 of 2: The first (cis - isomer) structure
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given this table of electronegativities: atom electronegativity h 2.2 c…
\(CBr_4<NI_3<H_2O<HF\)
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part 3 of 4 tebr₄ electron domain geometry: select molecular geometry: …
For TeBr₄: Electron Domain Geometry: Trigonal bipyramidal Molecular Geometry: Seesaw For SF₆: Electron Domain Geometry: Octahedral Molecular Geometry: Octahedral
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using the vsepr model, predict the electron domain geometry and the mol…
Part 1 of 4 NBr₃ Electron Domain Geometry: tetrahedral Molecular Geometry: trigonal pyramidal Part 2 of 4 XeO₄ Electron Domain Geometry: tetrahedral Molecular Geometry: tetrahedral
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question 9 1 pts what happened to the color of the drops of the starch …
D. Black to Amber
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question 5 2 pts in the starch - acid hydrolysis experiment: a. which r…
A. IKI B. Benedict's
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directions: 1. label each part of the formula reactant 2. complete the …
| Element | Coefficient | Subscript | Total | | ---- | ---- | ---- | ---- | | $N$ | 2 | 2 | 4 | | $O$ | 1 | 2 | 2 |
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directions: 1. label each part of the formula reactant 2. complete the …
| Element | Coefficient | Subscript | Total | | ---- | ---- | ---- | ---- | | N | 2 | 2 | 4 | | O | 1 | 2 | 2 |
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how many moles of k are in 106.15 grams? drag and drop the information …
$2.71\ mol\ K$
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rubidium (rb) has two naturally occurring isotopes: rb - 85 and rb - 87…
$85.47\ \text{amu}$
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part a lead consists of four naturally occurring isotopes. calculate th…
$208.2$ amu
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what is the atomic symbol of another isotope of gold with 116 neutrons?…
$^{195}_{79}Au$ $^{200}_{80}Hg$