化学
化学反应、化学计量、分子结构与元素性质。
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calculate the number of moles in 15 liters of oxygen at stp. 0.67 mol 6…
0.67 mol
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decide whether each molecule or polyatomic ion is polar or nonpolar. if…
| molecule or polyatomic ion | polar or nonpolar? | atom closest to negative side | | ---- | ---- | ---- | | $CH_4$ | nonpolar | | | $Cl_2$ | nonpolar | | | OCS | polar | O |
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geometric isomers are molecules that ____. differ in the arrangement of…
First part: differ in the arrangement of their atoms about a double bond Second part: structural isomers
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draw the lewis dot diagram for a neutral atom of ca.
Ca with 2 dots on either side of the symbol (e.g., Ca • •)
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these molecules are thiois geometric isomers enantiomers r - dopa and l…
Part E: C. enantiomers Part F: B. are mirror images
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are all the atoms stable with a full octet? yes no
No
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these molecules are ____ thiolamines amines geometric isomers enantiome…
First part: E. structural isomers Second part: A. geometric isomers
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decide whether these proposed lewis structures are reasonable. proposed…
1. Yes. 2. Yes. 3. No, it has the wrong number of valence electrons. The correct number is: 16.
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2) determine the central atom (the element there is only one of) 3) dra…
18
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how many electrons did we use up in the bond skeleton (notice how there…
6
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decide whether these proposed lewis structures are reasonable. proposed…
1. Yes. 2. No, it has the wrong number of valence electrons. The correct number is: 10 3. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The …
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multiple - choice question why are there no lone pairs on the hydrogen …
C. Hydrogen is full/stable with 2 valence electrons
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which of the following is not one of the functions of the skin? a) cond…
C. Gives the body its overall shape, loss of this function can be seen with the drooping of skin with age.
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decide whether these proposed lewis structures are reasonable. proposed…
1. Yes 2. No, it has the wrong number of valence electrons. The correct number is: 10 3. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The s…
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what is the purpose of the responsible appliance disposal (rad) program…
to recover ozone - depleting chemicals from appliances
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1. what compound precipitated? multiple choice. briefly tell why for sh…
1. $AgCl$ 2. $Ca_3(PO_4)_2$ 3. $Fe(OH)_2$ 4. $NiS$ 5. $BaSO_4$ 6. $ZnS$ 7. $AlPO_4$ 8. $CaSO_4$ 9. $AgCl$ 10. $PbI_2$ 11. $AlPO_4$ 12. $PbI_2$ 13. $CaSO_4$ 14. $CuCO_3$
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multiple - choice question what are lone pairs? 2 electrons - not share…
A. 2 electrons - NOT shared in a bond
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how has the montreal protocol been amended over time? by reducing the p…
by reducing the phase-out period for ODS
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decide whether these proposed lewis structures are reasonable. proposed…
1. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: $O$ 2. No, it has the wrong number of valence electro…
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a nurse assesses a client who returns to the clinic for another round o…
B. "Some medications for cancer may weaken your immune system and cause fungal infections."
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try again your answer is incorrect. • row 1: clo⁻: your answer is incor…
No, it has the wrong number of valence electrons. The correct number is: 14. The symbols of the problem atoms are: Cl For the second ClO⁻ structure:
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draw this o₂ molecule and label the two types of electron areas you see…
8
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how many electrons are represented in 2 lines (double bond)? 4 electron…
4 electrons
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try again your answer is incorrect. • row 1: clo⁻ your answer is incorr…
For the first ClO⁻ structure: No, it has the wrong number of valence electrons. The correct number is 14. For the second ClO⁻ structure: No, it has the wrong number of valence ele…
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reaction product 3/3 consider: how many grams of sio₂ are produced when…
The mass of $SiO_2$ produced is approximately 18.81 g. The mass of the excess reactant ($O_2$) consumed is 5.008 g.
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what is the max number of dots allowed on each side of a lewis diagram?…
2 dots
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decide whether these proposed lewis structures are reasonable. proposed…
1. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: Cl 2. Yes 3. Yes
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what do the dots represent in the lewis diagram? total electrons proton…
C. Valence Electrons
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below is the lewis structure of the nitrogen (n₂) molecule. :n:::n: cou…
bonding pairs: 3 lone pairs: 1
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look at a periodic table and answer this question: how many valence ele…
A. 7
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below is the lewis structure of the hydrogen cyanide (hcn) molecule. h …
bonding pairs: 1 lone pairs: 0
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how many valence electrons does carbon have? 2 4 8 6
B. 4
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multiple-choice question which kind of bond has shared electrons? coval…
A. Covalent
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multiple - choice question which type of compound has a complete transf…
B. Ionic
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oxygen has how many valence electrons? 6 4 5 7
6
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multiple - choice question electron dot structures show... valence elec…
A. valence electrons
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multiple - choice question a chemical bond is... always ionic. an elect…
C. an electrostatic attraction
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ozone - depleting chemicals the ozone layer is a crucial part of the st…
They pose a threat to the ozone layer
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ozone - depleting chemicals the ozone layer is a crucial part of the st…
increased ultraviolet radiation
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multiple - choice question in ionic bonds there is... sharing of electr…
C. a complete transfer of electrons.
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ozone - depleting chemicals the ozone layer is a crucial part of the st…
migrate up into the atmosphere
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swyk: energy diagrams match each labeled part of the diagram with what …
A. Energy of Reactants B. Activation Energy C. Change in Energy of Reaction D. Energy of Products
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how many ozone molecules can be broken down by 1 chlorine atom? about 1…
Up to 100,000
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swyk: energy diagrams the energy diagram above represents an reaction, …
Exothermic; released
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which group of chemicals are known as \ozone - depleting chemicals\? ha…
Halogens
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swyk: energy diagrams potential energy reaction coordinate the energy d…
Exothermic; released
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multiple - choice question which kind of compound has delocalized elect…
B. Metals
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match each labeled part of the diagram with what it represents. potenti…
A. Energy of Reactants B. Activation Energy C. Total Energy of Reaction D. Change in Energy of Reaction E. Energy of Products
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the normal melting point of water is 0°c. 20 sep interpret data use the…
$CO_2$ is in the gas phase at STP. The normal sublimation temperature of $CO_2$ is approximately $-78.5^{\circ}C$.
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Question | Answer | |--|--| | Write the symbol for this MO. | $\pi^*$ | | Is this a bonding or antibonding MO? | antibonding | | What is the energy of this MO, compared to the e…
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hydrocarbons are organic molecules that contain only > view available h…
B. carbon and hydrogen atoms
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multiple - choice question metals form a lattice structure that consist…
B. False
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Symbol for this MO | $\pi^*$ | | Bonding or anti - bonding | anti - bonding | | Energy compared to 2p orbital | higher |
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19 ccc stability and change predict whether or not the substances in th…
| Substance | Type of Bond or Intermolecular Force | Sublime at STP? | |--|--|--| | Carbon dioxide (CO₂) | London - dispersion forces | Yes | | Hydrogen fluoride (HF) | Hydrogen b…
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Symbol for MO | $\pi^*$ | | Bonding or antibonding | antibonding | | Energy compared to 2p orbital | higher |
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Question | Answer | |--|--| | Write the symbol for this MO. | $\pi$ | | Is this a bonding or antibonding MO? | antibonding | | What is the energy of this MO, compared to the ene…
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18 sep analyze and interpret data the table shows several ionic solids,…
Approximately 30.52 eV/bond
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Question | Answer | |--|--| | Write the symbol for this MO. | $\sigma_{2s}^*$ | | Is this a bonding or antibonding MO? | antibonding | | What is the energy of this MO, compared …
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sep interpret data the table compares vapor pressure values for water, …
The normal boiling point of water is 100°C, of ethanol is around 78°C, and of diethyl ether is around 35°C. The strength of attraction between particles is strongest in water, int…
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define the following: 2. macromolecules - 3. polymers -
2. Macromolecules: Large, complex molecules important for biological functions, typically composed of numerous atoms. 3. Polymers: Substances made of repeating monomer units that …
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Write the symbol for this MO | $\sigma_{2s}$ | | Is this a bonding or antibonding MO? | bonding | | What is the energy of this MO, compared to the …
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reaction product 1/3 1. how many grams of sio₂ are produced when 13.8 g…
18.8
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why does the stratosphere warm up as you go through it? absorption of u…
absorption of ultraviolet radiation by ozone
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Question | Answer | |--|--| | Write the symbol for this MO. | $\sigma_{2s}$ | | Is this a bonding or antibonding MO? | bonding | | What is the energy of this MO, compared to the…
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tag all the sp³ hybridized carbon atoms in this molecule. if there are …
The left - hand carbon atom is $sp^{3}$ hybridized.
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combustion reaction 2/2 consider equation no. 9. how many grams of co₂ …
1. $16.12\ g$ 2. $63.3$
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study the following sketch of a molecular orbital (mo) in a homonuclear…
| Property | Answer | |--|--| | Symbol for MO | $\sigma$ | | Bonding or antibonding | bonding | | Energy compared to 2s orbital | lower |
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what type of elements are present in an ionic compound? both metal and …
Both metal and non - metal elements
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what type of elements are present in a metallic bond? only non - metal …
only metallic elements
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what type of elements are present in a covalent bond? both metal and no…
only non - metal elements
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what type of bonding is present in naoh? ionic covalent metallic
ionic
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which formula represents an ionic compound? cufe ch₄ alcl₃
C. $AlCl_3$
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name the following compound nacl
Sodium chloride
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determine if the following is an element, molecule, compound, or both (…
A. Both
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determine if the following is an element, molecule, compound, or both (…
A. Molecule
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determine if the following is an element, molecule, compound, or both (…
Element
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all of the following are signs and symptoms of someone having vertebrob…
There is no correct "except" option among a) Diplopia, b) Numbness, bilateral, c) Ataxia, d) Dizziness/vertigo as all are common VBI symptoms.
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combustion reaction 1/2 consider equation no. 9. 1. how many grams of c…
$16.12\ g$
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(h) 114.00 g/mol c₉h₂₀ + o₂ → co₂ + h₂o (k) 128.00 g/mol
The balanced chemical equation is $C_9H_{20}+14O_2 ightarrow9CO_2 + 10H_2O$.
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directions: complete the following table. | atomic structure | protons …
| Atomic Structure | Protons ($p^+$) | Neutrons ($n^0$) | Electrons ($e^-$) | | ---- | ---- | ---- | ---- | | Location in Atom | Nucleus | Nucleus | Outside nucleus | | Charge | +…
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select the correct answer. which is a chemical property? a. color b. de…
E. flammability
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what occurs in a polar bond? the atoms have the same charge. the atoms …
One atom is SLIGHTLY more electronegative than the other.
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what type of bond tends to form when two different non - metal atoms wi…
C. polar bonds
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which set correctly orders the atoms from lowest to highest ionization …
Rb < Na < Si < S
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the octet rules says that most atoms will gain, lose, or share electron…
B. eight
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select the correct answer the police force in a particular city have to…
E. psychologist
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which statement correctly describes glucose (c₆h₁₂o₆)? it is made of ma…
It is a compound made of twenty - four total atoms.
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1. al₂(so₄)₃ + bacl₂ → baso₄ + alcl₃ 8. nh₃ → h₂ + n₂
1. $Al_2(SO_4)_3 + 3BaCl_2 = 3BaSO_4+2AlCl_3$ 2. $2NH_3 = 3H_2+N_2$
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consider reaction no. 4. what are the values for the balanced equation …
243
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what is ionization? splitting a larger nucleus to make two smaller nucl…
gain or loss of electrons to make ions
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select the correct answer a sample of physical evidence was heated with…
C. carbon
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unit exam - the periodic table which element will form the ion with the…
F
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directions: complete the following table using the information provided…
| Atom/Ion | Mass Number | Protons ($p$) | Neutrons ($n$) | Electrons ($e$) | Complete Symbol | |---|---|---|---|---|---| | $Ca^{2+}$ | 40 | 20 | 20 | 18 | $_{20}^{40}Ca^{2+}$ | |…
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which particle represents the size of the bromine ion compared to the b…
larger
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which element will have the smallest atomic radius? potassium (k) calci…
germanium (Ge)
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which element will have the smallest atomic radius? phosphorus (p) sulf…
S. sulfur (S)
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which element is the most reactive, based on the data? element i elemen…
D. Element L
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what reaction type, or classification, is represented by no. 4? multipl…
double displacement
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activity of unknown elements reactivity ranking order the reactivity da…
Element I < Element K < Element J < Element L
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which characteristic belongs to most metal elements? shiny non - conduc…
shiny