化學
化學反應、化學計量、分子結構與元素性質。
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assess it! part 2 use the vocabulary words from ead it\ to complete the…
(4) atom (5) chemical bonds (6) molecule (7) chemical formula (8) chemical change
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1. what type of bonds are present? a. covalent b. ionic c. metallic d. …
A. Covalent
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assess it! part 1 1. bonds share valence electrons with other atoms. a.…
A. Covalent
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which of these actions will change the molecule geometry? changing a si…
- For "Which of these actions will change the molecule geometry?": changing a bond to a lone pair - For "Which of these actions will change the electron geometry?": neither
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predict whether the following reactions will be exothermic or endotherm…
- Endothermic reaction: C - Exothermic reactions: A, B, D
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use the molar bond enthalpy data in the table to estimate the value of …
\(-420\space kJ\cdot mol^{-1}\)
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sort the descriptions and pictures into the correct categories. organiz…
Covalent Bonds: Occurs between two nonmetals, Share valence electrons. Ionic Bonds: Occurs between a metal and a nonmetal, Transfer valence electrons.
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for the reaction: x + 3y ⇌ 2z, the concentrations of these reactants an…
II and IV
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to improve air quality and obtain a useful product, chemists often remo…
If \(H_{2}O\) is removed, this will cause \(Q < K\)
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question 17 (1 point) drugs such as aspirin and acetaminophen have a _ …
- Question 17: antipyretic - Question 18: Cataracts - Question 19: Generic name
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part 1 of 3 the following statements, i-iii, refer to the following rea…
- I. False - II. True - III. False
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describing soil profiles match each soil horizon to the description of …
horizon C: parent material barely affected by soil formation process horizon A: decomposed organic material mixes with highly weathered parent material horizon B: undergoes the mo…
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at 43°c, ( k_p = 2.2 ) for the following reaction: ( so_2cl_2(g) ightle…
$0.0380$
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1. what type of elements typically become positively charged ions? 2. w…
1. Metals. 2. Non - metals.
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use the sodium (na) and chlorine (cl) atoms for this next activity. bot…
The electron is placed in chlorine's outer - shell because chlorine needs one more electron to complete its octet (have 8 electrons in its outer - shell) and achieve a stable elec…
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explore it! part 3 the electrons are shared in the model you created. t…
1. 8 2. 2 3. Yes
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1. how many electrons would oxygen (o) need to have in its outer shell …
1. 2 electrons. 2. \(H_{2}O\) (water).
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1. how many electrons would oxygen (o) need to have in its outer shell …
Oxygen needs \(2\) more electrons to have a full outer shell (8 electrons in total in the outer shell).
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explore it! part 1 in front of you are some models of atoms. the black …
1. A valence electron is an electron in the outermost shell of an atom. 2. Water (\(H_2O\)), carbon dioxide (\(CO_2\)), methane (\(CH_4\)).
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read it! why are chemical bonds important? - questions 1. which of the …
1. A. Bonds create new elements 2. D. All of the above 3. B. Exothermic
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comparing types of weathering drag and drop each phrase below the type …
Mechanical Weathering: does not change rock composition, abrasion, ice wedging. Chemical Weathering: oxidation, changes rock composition, acid rain.
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an important formula from chemistry is ( pv = nrt ). solve the formula …
\(n=\frac{PV}{RT}\), so the second option \(n = \frac{PV}{RT}\) is correct.
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which sentence is correct? commonly used in blimps and balloons, we kno…
The second sentence "We know that helium, commonly used in blimps and balloons, is actually less buoyant than hydrogen but safer to use because it doesn't burn or react with other…
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common name molecular formula elements in the compound number of atoms …
| Common Name | Molecular Formula | Elements In the compound | Number of atoms of each element | One fact about the Compound | |---|---|---|---|---| | Salt | \(NaCl\) | Sodium (\(…
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common name molecular formula elements in the compound number of atoms …
| Common Name | Molecular Formula | Elements in the compound | Number of atoms of each element | One Fact about the Compound | | --- | --- | --- | --- | --- | | Salt | NaCl | Sodi…
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how many atoms of oxygen (o) are in the compound: * 2 points znso₄ 1 at…
4 atoms
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how many atoms of sulfur (s) are in the compound: * 2 points znso4 1 at…
1 atom
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how many atoms of zinc (zn) are in the compound: * znso4 1 atom 2 atoms…
1 atom
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which of the following elements are in the compound: * 2 points znso₄ z…
Zinc (Zn), Sulfur (S), and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * p2o3 1 atom 2 atoms…
3 atoms
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how many atoms of phosphorus (p) are in the compound: * 1 atom 2 atoms …
B. 2 atoms
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which of the following elements are in the compound: * 2 points phospho…
Phosphorus (P) and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * citric acid 1 atom …
C. 7 atoms
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how many atoms of carbon (c) are in the compound: *citric acid1 atom6 a…
B. 6 atoms
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how many atoms of hydrogen (h) are in the compound: *citric acid 1 atom…
8 atoms
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which of the following elements are in the compound: * citric acid hydr…
C. Carbon (C), Hydrogen (H), and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * carbonic acid h₂co₃…
C. 3 atoms
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how many atoms of carbon (c) are in the compound:* carbonic acid 1 atom…
1 atom
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how many atoms of hydrogen (h) are in the compound: * carbonic acid h₂c…
B. 2 atoms
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which of the following elements are in the compound: * carbonic acid h₂…
Hydrogen (H), Carbon (C), and Oxygen (O)
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how many atoms of hydrogen (h) are in the compound: * n₂h₄ hydrazine 1 …
4 atoms
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how many atoms of nitrogen (n) are in the compound: * n₂h₄ hydrazine 1 …
2 atoms
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which of the following elements are in the compound: * n₂h₄ hydrazine n…
B. Nitrogen (N) and Hydrogen (H)
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how many atoms of oxygen (0) are in the compound:*sulfuricacidh₂so₄1 at…
4 atoms
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how many atoms of sulfur (s) are in the compound? sulfuric acid h₂so₄ 1…
1 atom
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how many atoms of hydrogen (h) are in the compound: * sulfuric acid h₂s…
B. 2 atoms
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which of the following elements are in the compound: * sulfuric acid h₂…
C. Hydrogen (H), Sulfur (S), Oxygen (O)
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how many atoms of hydrogen (h) are in the compound? ammonia nh₃ 1 atom …
C. 3 atoms
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how many atoms of nitrogen (n) are in the compound: * ammonia nh3 1 ato…
1 atom
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which of the following elements are in the compound: * ammonia nh3 calc…
B. Nitrogen (N) and Hydrogen (H)
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how many atoms of oxygen (o) are in the compound: * phosphoric acid 1 a…
4 atoms
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how many atoms of phosphorus (p) are in the compound: * phosphoric acid…
1 atom
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how many atoms of hydrogen (h) are in the compound? phosphoric acid h_3…
C. 3 atoms
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which of the following elements are in the compound: * phosphoric acid …
B. Hydrogen (H), Phosphorus (P), and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * calcium peroxide ca…
B. 2 atoms
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how many atoms of calcium (ca) are in the compound? calcium peroxide ca…
A. 1 atom
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which of the following elements are in the compound: * calcium peroxide…
Calcium (Ca) and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * 2 points magnesium …
C. 4 atoms
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how many atoms of sulfur (s) are in the compound: * 2 po magnesium sulf…
1 atom
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how many atoms of magnesium (mg) are in the compound: * magnesium sulfa…
1 atom
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which of the following elements are in the compound: * magnesium sulfat…
C. Magnesium (Mg), Sulfur (S) and Oxygen (O)
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how many atoms of magnesium (mg) are in the compound: * magnesium perox…
1 atom
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how many atoms of oxygen (o) are in the compound: * magnesium peroxide …
2 atoms
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which of the following elements are in the compound: * magnesium peroxi…
C. Magnesium (Mg) and Oxygen (O)
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how many atoms of oxygen (o) are in the compound: * k2o 1 atom 2 atoms …
1 atom
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how many atoms of potassium (k) are in the compound: * 1 atom 2 atoms 3…
B. 2 atoms
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which of the following elements are in the compound: * oxygen (o) and n…
Potassium (K) and Oxygen (O)
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how many atoms of hydrogen (h) are in the compound: * water h₂o 1 atom …
B. 2 atoms
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how many atoms of oxygen (o) are in the compound: * water h₂o 1 atom 2 …
1 atom
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how many atoms of oxygen (o) are in the compound: * carbon dioxide co₂ …
B. 2 atoms
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how many atoms of carbon (c) are in the compound: * carbon dioxide co₂ …
1 atom
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which of the following elements are in the compound: * carbon dioxide c…
Carbon (C) and Oxygen (O)
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2. write the resonance forms of ozone, o₃, the component of the upper a…
The resonance forms are $\overset{-}{O}-\overset{+}{O}=O$ and $O=\overset{+}{O}-\overset{-}{O}$, and the bond order of the $O - O$ bonds in $O_{3}$ is $1.5$.
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quotation from the article: o matter what phase water is in, the water …
This evidence is important as it highlights the conservation of the chemical identity of water molecules during phase changes, which is a key concept in understanding physical cha…
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
| gas | mole fraction | partial pressure | |----|----|----| | \(N_2\) | \(0.480\) | \(144\) torr | | \(O_2\) | \(0.520\) | \(156\) torr |
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5. 250 kj of energy are removed from a 4.00 x 10² g sample of water at …
Since \(Q_{total}=233.92\space kJ<250\space kJ\), the sample of water will completely freeze.
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2. write the resonance forms of ozone, o₃, the component of the upper a…
The two resonance forms of \(O_3\) are: \(\ce{O - O = O}\) and \(\ce{O = O - O}\) (where the double - bond can be on either side of the central \(O\) atom). The bond order of the …
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part b read each scenario. decide whether a physical or chemical change…
1. Physical change. Just cutting and spreading (form change). 2. Chemical change. Burning (new substances like carbon, smoke). 3. Chemical change. Rust (iron oxide - new substance…
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four samples of the same unknown gas g are listed in the table below. r…
A: 1, B: 2, D: 3, C: 4
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four 0.5 mol samples of krypton gas are described in the table below. r…
- Sample C: \(1\) - Sample D: \(2\) - Sample B: \(3\) - Sample A: \(4\)
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4. 65.0 kilojoules of energy are added to 150 g of ice at 0.0°c. what i…
The final temperature of the water is approximately \(23.7^{\circ}C\)
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nitroglycerin is a dangerous powerful explosive that violently decompos…
\(4C_{3}H_{5}(NO_{3})_{3}(l) ightarrow6N_{2}(g)+O_{2}(g)+10H_{2}O(g)+12CO_{2}(g)\)
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nitroglycerin is a dangerous powerful explosive that violently decompos…
\(\ce{4C3H5(NO3)3(l) ightarrow 6N2(g) + O2(g)+10H2O(g)+12CO2(g)}\) ### 2. Mass of Nitroglycerin
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
| gas | mole fraction | partial pressure | |----|----|----| | \(N_2\) | \(0.83\) | \(0.042\ kPa\) | | \(O_2\) | \(0.17\) | \(0.0085\ kPa\) |
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three samples of three different gases are listed in the table below. a…
| sample | pressure (atm) | volume (L) | ideal? | If not ideal, the most important reason why not: | |---|---|---|---|---| | A | 1.4 | 20.0 | no | There are attractions between th…
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a gas made up of homonuclear diatomic molecules escapes through a pinho…
\( O_2 \)
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sometimes in lab we collect the gas formed by a chemical reaction over …
\(0.13\ g\)
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a 10.0 l tank at 10.2°c is filled with 5.85 g of dinitrogen monoxide ga…
- Dinitrogen monoxide: - Mole fraction: \(0.578\) - Partial pressure: \(0.310\space atm\) - Dinitrogen difluoride: - Mole fraction: \(0.422\) - Partial pressure: \(0.227\space atm…
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a 10.00 l tank at 28.6 °c is filled with 8.31 g of boron trifluoride ga…
| gas | mole fraction | | ---- | ---- | | boron trifluoride | \(0.491\) | | dinitrogen monoxide | \(0.509\) |
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
| gas | mole fraction | partial pressure | | ---- | ---- | ---- | | \(N_2\) | \(0.86\) | \(0.043\space kPa\) | | \(O_2\) | \(0.14\) | \(0.0070\space kPa\) |
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label elements, compounds, and mixtures - k each circle represents an a…
Mixture of compounds
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label elements, compounds, and mixtures - k each circle represents an a…
Compound
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label elements, compounds, and mixtures - k each circle represents an a…
Compound
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label elements, compounds, and mixtures - k each circle represents an a…
Compound
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
| gas | mole fraction | partial pressure | | ---- | ---- | ---- | | \(N_2\) | \(0.0476\) | \(0.122\) atm | | \(O_2\) | \(0.952\) | \(2.43\) atm |
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label elements, compounds, and mixtures - k each circle represents an a…
Mixture of elements
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a sample of an unknown compound is vaporized at 110. °c. the gas produc…
\(32.0\space g/mol\)
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label elements, compounds, and mixtures - k each circle represents an a…
Mixture of elements and compounds
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label elements, compounds, and mixtures - k each circle represents an a…
Mixture of elements and compounds
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calculate to three significant digits the density of chlorine pentafluo…
\(5.71\frac{\text{g}}{\text{L}}\)