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 grams of mg(oh)2 are in 7.5 x 10^23 formula units (f.un.) mg(o…
\(73\ \text{g}\)
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how many grams of mg(oh)2 are in 7.5 x 1023 formula units (f.un.) mg(oh…
\(58.32\ g\)
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8. practice: in the spaces below, write and illustrate electron configu…
- Nitrogen configuration: \(1s^{2}2s^{2}2p^{3}\) (Orbital diagram: \(1s\) - two electrons, \(2s\) - two electrons, \(2p\) - three single - electron squares) - Oxygen configuration…
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how many grams of mg(oh)2 are in 7.5 x 10^23 formula units (f.un.) mg(o…
1 mole
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how many grams of mg(oh)₂ are in 7.5 x 10²³ formula units (f.un.) mg(oh…
\(6.02\times 10^{23}\space f.un.\) goes in the green box.
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17. a student notices that sugar, when heated over a flame, turns black…
17. C. The color of the sugar changed to black 12. A. After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown 10. \(H_2O\) (water) and \(O_2\) (…
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17. a student notices that sugar, when heated over a flame, turns black…
C. The color of the sugar changed to black
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activity c (continued from previous page) 8. make a rule: next to subsh…
A. \(5s\) B. \(4f\) C. \(6p\)
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use the chemical reaction to answer the question. 2h₂ + o₂ → 2h₂o there…
4
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chemical reactions quick check use the chemical reaction to answer the …
The atoms of the reactants are regrouped during the reaction.
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which is most likely to occur during a chemical reaction? (1 point) ato…
Mass is conserved.
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use the chemical reaction to answer the question. 4fe + 3o₂ → 2fe₂o₃ wh…
They are rearranged.
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use the chemical reaction to answer the question. caco₃→co₂ + cao a sci…
30 grams
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use the chemical reaction to answer the question. 2h₂ + o₂ → 2h₂o there…
4
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use the chemical reaction to answer the question. nahco₃ + hc₂h₃o₂ → na…
The atoms of the reactants are regrouped during the reaction.
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which is most likely to occur during a chemical reaction? (1 point) new…
Mass is conserved.
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use the chemical reaction to answer the question. 4fe + 3o₂ → 2fe₂o₃ wh…
They are rearranged.
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chemical reactions quick check use the chemical reaction to answer the …
30 grams
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20 sep interpret data use the phase diagram for carbon dioxide (co₂) to…
At STP (\(0^{\circ}C\), \(1\ atm\)), \(CO_2\) is in the gas phase. The normal sublimation temperature of \(CO_2\) is \(-78.5^{\circ}C\).
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question 1 (multiple choice worth 2 points) (01.02r mc) select the phys…
Size
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the outdoors club at school goes camping near the coast of new york. th…
First, filter the ocean - water mixture to remove seaweed as it is insoluble. Then, distill the filtered liquid to separate alcohol (boiling at \(76^{\circ}C\)). Finally, distill …
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9. practice: determine the electron configurations of the following ele…
- Cobalt (Co): \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}\) - Germanium (Ge): \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{2}\) - Neodymium (Nd): \(1s^{2}2s^{2}2p^{6}3s^{2}3…
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19 ccc stability and change predict whether or not the substances in th…
| Compound | Type of Bond or Intermolecular Force | Sublime at STP? | |---|---|---| | Carbon dioxide (\(\ce{CO2}\)) | London dispersion forces | Yes | | Hydrogen fluoride (\(\ce{H…
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select the theory that states that matter is composed of tiny particles…
A. Atomic Theory
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select the statement that best describes atomic theory atoms are larger…
Matter is composed of atoms.
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select the group that consists entirely of matter cells, neurons, thoug…
Pillows, trees, tables
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select the word to complete the sentence. tiny particles that are the b…
atoms
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which option is an example of a chemical change? (1 point) burning wood…
burning wood
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why is it a physical change to freeze water? (1 point) the new and orig…
Only a phase change occurs.
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use the table of observed changes to answer the question.indicators of …
2 and 4
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sep interpret data the table compares vapor pressure values for water, …
- **Boiling Points**: - Water: \(100^{\circ}C\) - Ethanol: Approximately \(78^{\circ}C\) - Diethyl ether: Approximately \(35^{\circ}C\) - **Intermolecular Forces**: - The strength…
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physical vs. chemical change quick check which observation most likely …
A reaction occurs.
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a scientist studies an element that has seven electrons in its outer sh…
17 - halogens
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name che 151 homework: module 10 - organic compounds 1. what is the che…
a. \(C_9H_{20}\) b. \(C_5H_{10}\) c. \(C_8H_{14}\)
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neon and argon are both in group 18 of the periodic table. which proper…
low or no reactivity
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which property do transition metals have in common? (1 point) they are …
They usually have high melting points.
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which statement about nitrogen (n) and phosphorus (p) is correct? (1 po…
They have the same number of valence electrons.
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sep ask questions the process of evaporation has a different outcome in…
In an open water bottle, the water level decreases due to evaporation (water molecules escape into the air). In a closed water bottle, the water level remains relatively constant …
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the periodic table quick check which two groups of elements in the peri…
alkali metals and halogens
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15 sep interpret data the table shows the atomic radii and boiling poin…
The predicted boiling point of \(At_2\) is approximately \(562\) K.
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complete the sentence using ide, ate or ic. to determine the name of an…
ide
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which term describes the repeated arrangement of the same molecule? (1 …
C. extended structure
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use the model of a molecule to answer the question. h h | | h - c - c -…
2 atoms
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molecules and structures quick check a molecule of ethanol has two carb…
The black balls represent carbon atoms.
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which of the following does the atomic number of an atom represent? (1 …
the number of protons in the atom
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a student wants to draw a model of an atom. which statement describes h…
Subtract the atomic number from the mass number.
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the composition of atoms quick check a model of an atom shows eight ele…
two in the first energy level, six in the second energy level
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electron configuration objectives: draw an orbital diagram for a given …
1. \(Be^{2+}\): \(1s^{2}\) 2. \(Li^{1+}\): \(1s^{2}\) 3. \(F^{1-}\): \(1s^{2}2s^{2}2p^{6}\) 4. \(Br^{1-}\): \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}\) 5. \(Mg^{2+}\): \…
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answer the questions below about the highlighted atom in this lewis str…
- In how many sigma bonds does the highlighted atom participate? \(4\) - In how many pi bonds does the highlighted atom participate? \(0\) - What is the orbital hybridization of t…
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compound x has a molar mass of 283.89 g·mol⁻¹ and the following composi…
$P_{4}O_{10}$
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predict the products of the following reaction. if no reaction will occ…
\(2CH_3(CH_2)_3OH(l)+15O_2(g) ightarrow10CO_2(g)+12H_2O(l)\)
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what kind of intermolecular forces act between an ammonia molecule and …
London dispersion forces, dipole - dipole forces, hydrogen bonding
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each week capechem, a manufacturer of fine chemicals, uses up 1000. kg …
1900 kg 1596 kg
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pick the word that best completes the following sentence. a ________ mi…
A. homogeneous
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calculate the volume in milliliters of a 0.24m aluminum sulfate solutio…
$830\space mL$
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the gaia theory was first proposed by james lovelock a british research…
D. a way of understanding the Earth’s regulatory mechanism
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key concept: interconversion of the forms of energy activity 4 rohan an…
Fire alarm: Input - electrical energy, Output - sound energy Toaster: Input - electrical energy, Output - heat energy Torch light: Input - chemical energy, Output - light energy S…
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decide whether each chemical reaction in the table below is an oxidatio…
- For \(3Cr(NO_3)_2(aq)+2Al(s)\to3Cr(s)+2Al(NO_3)_3(aq)\): redox reaction? yes; reducing agent: \(Al\); oxidizing agent: \(Cr(NO_3)_2\) - For \(HSO_4^-(aq)+OH^-(aq)\to SO_4^{2 - }…
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② 25 ml h₂so₄ reacting with 12.15 ml of 1.885 m ba(oh)₂ find conc. h₂so…
The concentration of $\ce{H_{2}SO_{4}}$ is $0.916\space M$
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25 ml h₂so₄ reacting with 12.15 ml of 1.885m ba(oh)₂ find conc. h₂so₄ f…
The concentration of $\ce{H2SO4}$ is approximately $0.916\ M$
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the owner of an organic pet food store would like to analyze the sales …
$15\%$
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decide whether each chemical reaction in the table below is an oxidatio…
For \(2N_2(g)+5O_2(g)\to2N_2O_5(g)\): redox reaction? yes; reducing agent: \(N_2\); oxidizing agent: \(O_2\) For \(S_8(s)+4Pb(s)\to4PbS_2(s)\): redox reaction? yes; reducing agent…
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define the following terms: 1. cohesion 2. adhesion 3. capillary action…
1. Cohesion: Intermolecular force causing liquid to resist separation. 2. Adhesion: Attraction between molecules of different substances. 3. Capillary Action: Liquid flowing in na…
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or each reaction, write the chemical formulae of the oxidized reactants…
- For \(FeSO_4(aq)+Mg(s)\to Fe(s)+MgSO_4(aq)\): - reactants oxidized: \(Mg\) - reactants reduced: \(FeSO_4\) - For \(Ca(s)+ZnCl_2(aq)\to Zn(s)+CaCl_2(aq)\): - reactants oxidized: …
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for each reaction, write the chemical formulae of the oxidized reactant…
1. reactants oxidized: \(Zn\); reactants reduced: \(AgNO_3\) 2. reactants oxidized: \(Fe\); reactants reduced: \(Pb(NO_3)_2\) 3. reactants oxidized: \(Al\); reactants reduced: \(A…
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27. what energy conversion occurs when a toaster heats up a piece of br…
electrical energy to thermal energy
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for each reaction, write the chemical formulae of the oxidized reactant…
| Reaction | Reactants oxidized | Reactants reduced | |--|--|--| | \(Pb(s)+Hg(NO_3)_2(aq)\to Hg(l)+Pb(NO_3)_2(aq)\) | \(Pb\) | \(Hg(NO_3)_2\) | | \(2Fe(s)+3CuCl_2(aq)\to2FeCl_3(aq…
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11. which type of energy depends on an objects weight and height above …
gravitational potential energy
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ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(l) in this reaction, the oxygen atom in…
2
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quiz : balancing chemical reactions cao(s) + h₂o (l) → ca(oh)₂(s) in th…
\(2\) (the fourth option)
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quiz : balancing chemical reactions balance the following reaction (ent…
\(2H_2O ightarrow 2H_2+1O_2\)
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quiz : balancing chemical reactions ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(l) …
gas (the option with the correct state for oxygen as indicated by \((g)\) in the chemical equation)
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quiz : balancing chemical reactions balance the following reaction. (en…
1, 1, 1
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which of the following is not an example of chemical potential energy? …
- For the first question (about chemical potential energy): d. Sunlight - For the second question (about the hypothesis): c. The height of the ramp does not affect the potential e…
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quiz : balancing chemical reactions balance the following reaction (ent…
\(1\) \(Cl_2+2\) \(NaBr ightarrow2\) \(NaCl + 1\) \(Br_2\)
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quiz : balancing chemical reactions ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(l) …
1
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quiz : balancing chemical reactions cao(s) + h₂o (l) → ca(oh)₂(s) in th…
\(CaO\): Reactant \(H_2O\): Reactant \(Ca(OH)_2\): Product
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7 scrutiny (skrōtən-ē) - noun examines. - scrutiny means store security…
7. A. attention 8. B. evil 9. B. to be adequate 10. A. open
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select the correct balanced formula for potassium oxide ○ ko₂ ○ k₂o ○ k…
\(K_{2}O\) (the second option)
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classify each chemical compound listed in the table below. compound typ…
| compound | ionic | molecular | acid | base | | ---- | ---- | ---- | ---- | ---- | | \(H_3PO_4\) | | \(\checkmark\) | \(\checkmark\) | | | \(H_3PO_3\) | | \(\checkmark\) | \(\che…
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metallic bonds form because metals \want\ to give up valence electrons …
"want" to give up valence electrons
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classify each chemical compound listed in the table below. compound typ…
| compound | ionic | molecular | acid | base | |---|---|---|---|---| | \(HBrO_4\) | | \(\square\) | \(\square\) | | | \(H_2SO_3\) | | \(\square\) | \(\square\) | | | \(H_2SO_4\) |…
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why do metals have high melting points? they dont the negatively charge…
The correct explanation is "The negatively charged electrons act as a glue to hold the positively charged ions together."
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why are alloys generally used to make everyday objects? alloys are less…
Alloys are often stronger and less active than pure metals.
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in general, what can be said of the melting points of metals? they are …
They are high.
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what do metals conduct? both heat electricity neither
A. both
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in metals, the _________ electrons form a shared sea of electrons. oute…
Outer
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i can hit a metal with a hammer without the metal shattering because of…
Malleability
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at room temperature, most metals are
solid
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there are more metals than non metals in the periodic table. true false
True
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why do metallic compounds conduct electricity as solids? core electrons…
valence electrons are mobile, allowing electricity to flow through the metal (the purple - colored option)
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which of these are considered properties of metals? (choose all that ap…
malleability, ductility, luster (shininess)
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why does the melting point of metals increase across peri 3, from sodiu…
Increased number of valence electrons contributed to the "sea" and Attraction force between nuclei and free electron increases.
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why are metals malleable? the electrons are shared between two metal io…
The electrons are delocalized and able to move between the atoms.
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what is a colorless, odorless, and poisonous gas found in cigarette smo…
Carbon monoxide
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john dalton (1766 - 1844): john dalton was an english chemist. his idea…
1. The atomic theory of matter. 2. Atoms. 3. Different. 4. Atoms of different elements. 5. c) 1:1
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electrons that are free to move in metals oxidation number chemical bon…
delocalized electrons
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metallic bonding is...an attraction between positive ions and electrons…
an attraction between positive ions and electrons.
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which of the following is an alloy? nickel sterling silver chromium lead
sterling silver
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a mixture of two or more metals is called: mixture compound solution al…
alloy