化學
化學反應、化學計量、分子結構與元素性質。
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question 1 (10 points) listen what product is formed from the reaction …
The correct option is the one with the structure: \(\boldsymbol{\text{cyclopentane with a } -CH_3 \text{ group attached (the second option among the given choices)}}\) (in the for…
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1. a gas has no definite ____________ and no definite ____________.
A gas has no definite \underline{volume} and no definite \underline{shape}.
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1 a chemical is any substance that has definite, indefinite composition…
1. definite; all around us ### Question 2
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7. the density of lead is 11.342 g/ml. what would be the volume of a 20…
The volume of the lead sample is approximately $17634\space mL$ (or $17.634\space L$)
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triglycerides form when three fatty acid molecules combine with one mol…
3
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8. usually, stronger ________ forces between particles is linked to a g…
Usually, stronger $\boldsymbol{\text{intermolecular}}$ forces between particles is linked to a greater $\boldsymbol{\text{surface tension}}$ (or $\boldsymbol{\text{viscosity}}$, b…
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6. 28 g of iron shot is added to a graduated cylinder containing 40 ml …
The density of iron is $\boldsymbol{7\ g/cm^3}$ (or $\boldsymbol{7000\ g/L}$) ### Problem 7:
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5. what volume of silver metal will mass exactly 2500.0 g? the density …
The volume of silver metal is approximately $\boldsymbol{238.1\space cm^3}$ (or exactly $\boldsymbol{\frac{5000}{21}\space cm^3}$).
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3. what is the mass of the ethyl alcohol that exactly fills a 200.0 ml …
The mass of the ethyl alcohol is $157.8\ \text{g}$.
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3. the gas state of a substances that is usually a solid or a liquid at…
vapor
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parte 1a: análisis de documentos: analice los tres documentos siguiente…
To solve these questions, we analyze the document (Discurso de Miantonomo, tribu Narragansett, 1642) and answer each one: ### 1) ¿Qué sugiere Miantonomo que las tribus nativas ind…
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b. if the particles are randomly arranged, the solid is a(n) ______ sol…
amorphous
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a. when the particles are arranged in a specific, repeating order, the …
crystalline
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2. an element is a building block of choose an answer . the elements ar…
(for typical options): First blank: matter Second blank: in the periodic table Third blank: mass
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read the paragraph about what the endangered species act does. one sent…
The sentence to remove is: "Meanwhile, the Clean Air Act was passed to help keep dangerous chemicals out of the air."
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2. the type of solid depends on how the __________ in the solid are arr…
particles (atoms, ions, or molecules)
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1. drag and drop the label to the correct part of the entry for titaniu…
- A: name of element - B: chemical symbol - C: atomic mass
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matching: a) democritus b) dalton c) rutherford d) thomson 18. famous f…
C) Rutherford ### 19.
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16. which subatomic particle(s) will change the identity of the element…
a. proton ### Question 17
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b. other descriptions, such as mass or volume, are 3. particle ______ a…
To solve this fill - in - the - blank question related to the states of matter (a topic in Chemistry, which is a subfield of Natural Science), we analyze the key concepts: ### For…
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atomic number a. equals protons b. identifies the element c. equals ele…
d. all of the above
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metals and nonmetals. use words such as smaller/bigger, higher/lower, m…
To solve this, we analyze the trends for metals and nonmetals regarding their ions, ionization energy, and electronegativity: ### For Metals: 1. **Ion Size vs. Atom Size**: Metals…
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13. atomic number a. equals protons b. identifies the element c. equals…
d. all of the above ### Question 14:
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12. mass number equals a. protons b. neutrons c. protons + neutrons d. …
c. protons + neutrons
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summary atomic radius electronegativ i ionization energy ionic radius (…
### Ionic Radius Section - For Metals: Metal atoms lose electrons to form cations. When an atom loses electrons, the remaining electrons experience a greater effective nuclear cha…
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electronegativity of noble gases - what are the electronegativity value…
s (Filling the Blanks): #### Ionic Radius Section: - Metals ions are \(\boldsymbol{\text{smaller}}\) than metal atoms, because the atom \(\boldsymbol{\text{loses}}\) electrons to …
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which option correctly describes an oxidation-reduction reaction? - cre…
B. a transfer of electrons
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2. ______________________ can be described in many ways. a. some descri…
2. \underline{\text{Matter}} can be described in many ways. a. Some descriptions, such as color and odor, involve using your \underline{\text{senses}}.
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what happens when a substance is oxidized? it loses electrons. it relea…
It loses electrons.
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compare the chemical structure of maltose to lactose and sucrose. compl…
Maltose is a \(\boldsymbol{\text{disaccharide}}\) made of the \(\boldsymbol{\text{two molecules of}}\) glucose. Compared to lactose and sucrose, maltose has \(\boldsymbol{\text{th…
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animal milk is a natural source of the disaccharide lactose. the monosa…
A. Sucrose and lactose have the same chemical formula. B. The monosaccharides in lactose are galactose and glucose. C. Sucrose and lactose have different chemical structures. D. T…
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how does electronegativity change down the group? 1. label your x-axis …
To solve this problem about electronegativity trends, we first need to fill in the table with the correct atomic numbers and electronegativity values for the given elements (using…
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silver 0.235 if the same amount of heat is added to 50.0 g samples of e…
D) Gold (Note: The key concept here is specific heat capacity. Metals with lower specific heat capacities will experience a larger temperature change when the same amount of heat …
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a. describing matter 1. a form of matter is another name for a(n) _____…
state ### a.
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23) when methane is burned with oxygen the products are carbon dioxide …
23) A) 64 24) A) kinetic 25) B) \( 1.07 \times 10^6 \) 26) A) 1 and 3 only 27) C) 81 28) B) \( 46.1^\circ\text{C} \)
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some historians believed that the nebra sky disk, discovered in germany…
C. disproved
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a. describing matter 1. a. a form of matter is another name for a(n) __…
s: 1. a. liquids 1. b. plasma 2. a. senses 2. b. quantitative
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2. reasoning in order for an atom to have a zero charge, every proton, …
A helium atom has 2 protons (each with a charge of +1, so total proton charge is \(2\times(+1) = + 2\)) and 2 electrons (each with a charge of - 1, so total electron charge is \(2…
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solids, liquids, and gases lesson 1 a. describing matter 1. a form of m…
1. a. state; liquids b. plasma 2. Matter; a. senses; b. measurable (or physical properties) 3. arrangement; motion; a. constant; b. straight; collide 4. attraction; protons; elect…
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question: which of the following is/are made from melted quartz sand? a…
Glass
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how does electronegativity change across the period ? 1. label your x-a…
### Filled Table: | Element name | Atomic Number | Electronegativity | |--------------|---------------|-------------------| | Lithium | 3 | ~1.0 | | Beryllium | 4 | ~1.57 | | Boro…
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question: a silica tetrahedron molecule contains four ___ atoms and one…
oxygen
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16) which of the following is a homogeneous mixture? a) stainless steel…
16) A) stainless steel 17) C) brass 18) E) All of the above statements are true. 19) A) mixture - heterogeneous 20) C) homogeneous mixture 21) B) the odor of spearmint gum 22) E) …
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16) which of the following is a homogeneous mixture? a) stainless steel…
A. stainless steel ### Question 17
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16) which of the following is a homogeneous mixture? a) stainless steel…
A) stainless steel ### Question 17
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how does ionization energy change down a group? 1. label your x - axis …
(Trend): Ionization energy generally decreases as we move down the group (from Lithium to Cesium, and approximately to Francium) in the periodic table. The plotted data shows a do…
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22 multiple choice 1 point what is the primary chemical found in this s…
D. Dihydrogen Monoxide ### Question 23
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picture | name of the apparatus | use of the apparatus 1. image of a be…
- Name of the Apparatus: Beaker - Use of the apparatus: Used for holding, mixing, heating (carefully), measuring approximate liquid volumes, dissolving substances, and as a reacti…
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true/false. write t if the statement is true and f if the statement is …
F ### 2) Liquids have definite volume and indefinite shape. Liquids take the shape of their container (indefinite shape) but retain a fixed volume (definite volume) because the pa…
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question: ____ mixtures have a constant composition. answer input: spel…
homogeneous
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matter and energy true/false. write t if the statement is true and f if…
### TRUE/FALSE Answers: 1) An amorphous solid has long - range, repeating order. Amorphous solids have short - range order, not long - range repeating order. So the answer is F. 2…
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18 multiple choice 1 point according to section 9, what is the freezing…
These questions are related to Safety Data Sheet (SDS) information for a Prestone antifreeze/coolant product. To answer them, one would need to refer to the actual SDS document (t…
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how does ionization energy change across a period? 1. label your x-axis…
To solve this problem, we first need to find the atomic number and ionization energy for each element: ### Step 1: Determine Atomic Numbers - Lithium (Li): Atomic number = 3 - Bor…
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10 multiple choice 1 point where are flammable chemicals stored in the …
A. In the (yellow) flammable cabinet ### Question 11
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10 multiple choice 1 point where are flammable chemicals stored in the …
A. In the (yellow) flammable cabinet ### Question 11
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question: whats an observation of how elements in nature behave under c…
Scientific law
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question 8 (1 point) listen if you have weighed out too much solid comp…
c) remove the extra compound and put it in the waste container. ### Question 9
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question 7 (1 point) listen in the units, ml, the \m\ indicates ... a) …
d) Milli-
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based on the particle model, which part is favored at equilibrium? reac…
Product
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eddie’s chemistry teacher has asked the class to add various household …
B. weak base
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which compound is not a base? a nh₃ b naoh c hclo₄ d nh₄oh
C. \(HClO_4\)
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an acid-base neutralization always produces a salt and water. identify …
B. sodium chloride
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what is the volume of the liquid in the graduated cylinder shown below?…
e) 18 mL
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naoh and bleach have several characteristics in common. which is not on…
B. They have a pH<7.
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complete the following calculation and select the answer that is report…
c) \(1.6 \times 10^3 \, \text{cm}^3/\text{g}\)
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place the properties of acids and bases in the venn diagram under the c…
- **Acids**: Tastes Sour, Has a pH less than 7 - **Bases**: Feels slippery, Tastes Bitter, Has a pH greater than 7 - **Acids and Bases**: Conducts electricity
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naoh and bleach have several characteristics in common. which is not a …
B. They have a pH<7.
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when excess stomach acid is treated, reaction takes place in your stoma…
B. a salt and water
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and bases 1 of 9 next excess stomach acid is often treated with milk of…
C. 10.5
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for chapter 3: parts of speech overview helping verbs and main verbs 3d…
### Exercise A Solutions: #### 1. Perhaps we should learn more about birthday celebrations in various countries. - Verb phrase: $\underline{\underline{\text{should}}}$ $\underline…
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drag and drop words into the blanks to complete the prompt. the hydroge…
To solve this, we analyze each blank: 1. First blank: Atoms in a water molecule (H₂O) share electrons, forming **covalent** bonds. 2. Second blank: Uneven electron sharing creates…
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question 7 (1 point) listen if a volumetric pipet has 10 ml td +/- 0.01…
e) write 10.00 mL as the volume.
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question 6 (1 point) a silver - colored cube is handed to you. the pers…
B. \( 9.5 \, \text{g/cm}^3 \)
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question 5 (1 point) listen how many mass measurements will you obtain …
5) 2
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directions: use the key to help you choose the correct chemical formula…
### Problem 7 # Explanation: ## Step1: Analyze atom: Each sphere is an atom. Different patterns (striped, checkered) are different atoms? Wait, no—wait, in problem 7, there are tw…
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2 step conversion practice 17. convert 2.5 moles of magnesium into atom…
\( \boldsymbol{1.51 \times 10^{24}} \) atoms (or \( 1.5 \times 10^{24} \), depending on significant figures) ### Question 18: Calculate 5.0 moles of sulfur to grams
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13. calculate the number of atoms in 156.0 grams of gold 14. if you hav…
\( \approx 4.77 \times 10^{23}\) atoms (or more precise \( 4.769 \times 10^{23}\)) ### Question 14:
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2 step conversion practice 9. how many atoms are in 88.2 g of lead (pb)…
$\approx 2.56 \times 10^{23}$ atoms ### Question 10: How many atoms are in 156 g of gold (Au)?
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p. 6 measuring matter review word bank: physical, atoms and molecules, …
Physical ### Question 2
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17 which subatomic particle identifies the element? a) the number of ne…
C. the number of protons
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7. how do safety measures help reduce economic costs? by preventing pro…
A. By preventing property damage and loss of productivity. ### Question 8
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13 which of the following is the best choice to accurately measure the …
B. graduated cylinder
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12 type the full electron configuration for silicon. do not leave space…
1s22s22p63s23p2
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1. which physical properties of matter discussed in the animation can b…
Intensive physical properties such as density, color, melting point, boiling point, hardness (and others like specific heat, refractive index, etc.) can be observed or measured re…
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calcium is shiny, malleable, fairly reactive, conducts electricity well…
A. Ba
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10 what halogen is the most reactive (electronegative) element on the p…
A. F
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5. how many atoms are in 50.0 g of sodium (na)? 6. how many atoms are i…
$\approx 1.31 \times 10^{24}$ atoms ### Question 6:
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which of the following pieces of evidence best supports the claim that …
D. The Halogens are the most reactive nonmetals because they have 7 valence electrons.
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p.5 measuring matter 1. which physical properties of matter discussed i…
Physical #### 2.
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7 which of the following elements is a metalloid? a germanium (ge) b al…
A. germanium (Ge)
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6 which of the following elements is a nonmetal? a arsenic (as) b calci…
C. Chlorine (Cl)
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4. physical properties can be ______. a. observed and measured b. obser…
A. Observed and Measured ### Question 5
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5 compound name | formula | flame color lithium chloride | licl | red c…
C. calcium chloride
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you get to lab and your teacher has forgotten to label the flasks of ch…
D. perform a flame test
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13. how many significant figures does 0.00420 g have? options: 2, 4, 3,…
3 ### Question 14
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3 look at the following electron configurations. which of the atoms wil…
A. \(1s^{2}2s^{2}2p^{6}\)
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read the sentences. dr. dooms chemistry experiment exploded. the result…
A. a consequence
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how many valence electrons does the following element have? 1s²2s²2p⁶3s…
C. 5
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an experiment using the reaction of several elements is carried out at …
A. Sodium and aluminum are both metals that react to gain stability via the removal of electrons in their valence shells; therefore, no reaction occurs.
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4. which of the following digits is always significant? any nonzero dig…
Any nonzero digit. ### Question 5