化学
化学反应、化学计量、分子结构与元素性质。
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how is the modern periodic table arranged? ○ by atomic weight, with che…
by atomic number, with chemical families or groups in columns and periods in rows
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base your answer to the question on the information below and on your k…
The amount of thermal energy in the 2.0-kilogram block of dry ice is twice the amount of thermal energy in the 1.0-kilogram block of dry ice (at the same temperature, 194.5 K).
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20. how many valence electrons do the following have?calcium ______ hel…
### Part 1 20. Valence electrons: Calcium: 2; Helium: 2; Silicon: 4; Radium: 2; Argon: 8; Aluminum: 3 21. Total electrons: Gold: 79; Uranium: 92; Iron: 26; Copper: 29 22. Yes 23. …
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study guide for the periodic table part i: fill the group names and val…
### Part 1 Table: | Name of Group | Valence Electrons | Ionic Charge | |---------------|-------------------|--------------| | Alkali Metals | 1 | $+1$ | | Alkaline Earth Metals | …
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using commas correctlycomma rule focus: use these rules to make sentenc…
1. Although Erica was exhausted after her cross-country meet, she got up early the next morning for school 2. Robin wanted to stay; however, she knew her parents would not like it…
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modeling and practice h₂ + o₂ --> h₂o zn + hcl --> zncl₂ + h₂ c₃h₈ + o₂…
1. $2\text{H}_2 + \text{O}_2 ightarrow 2\text{H}_2\text{O}$ 2. $\text{Zn} + 2\text{HCl} ightarrow \text{ZnCl}_2 + \text{H}_2$ 3. $\text{C}_3\text{H}_8 + 5\text{O}_2 ightarrow 3\te…
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which of the following is a correct statement regarding engine starting…
Diesel engines often use glow plugs.
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weathering and erosion quick check which is correct about chemical weat…
Both chemical and physical weathering are processes that break down rocks.
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dimensional analysis two steps: use both avogadros number and a molar m…
8. $\boldsymbol{1.26\times10^{23}}$ molecules of $\text{H}_2\text{O}$ 9. $\boldsymbol{752\ \text{g}}$ of $\text{Ag}$ 10. $\boldsymbol{247\ \text{g}}$ of $\text{MgCl}_2$ 11. $\bold…
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dimensional analysis one step: choose the correct fraction for the prob…
1. $1.51 \times 10^{23}$ atoms of silver 2. $5.15 \times 10^{21}$ molecules of NaCl 3. $1419$ grams of Ca 4. $0.0157$ mol Pb 5. $8.24$ mol Au 6. $0.259$ mol $O_2$ 7. $0.0679$ mol …
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molar masses of compounds use the formula and your periodic table to ca…
1. $\text{Na}_2\text{SO}_4$: 142 2. $\text{H}_2\text{O}$: 18 3. $\text{CO}_2$: 44 4. $\text{Ca(OH)}_2$: 74 5. $\text{Al}_2(\text{SO}_4)_3$: 342 6. $\text{Mg}_3\text{N}_2$: 100 7. …
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which are the reactants in the following chemical equation? (select all…
$\text{H}_2$, $\text{O}_2$ --- ### Second Question
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part b: precipitation reactions 2. define a precipitation reaction in y…
2. A precipitation reaction is an aqueous chemical reaction where an insoluble solid (precipitate) forms from dissolved ionic reactants. 3. a) $\text{BaSO}_4$ b) $\text{PbI}_2$ 4.…
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do now: mcqs – types of chemical reactions name: date: class: 1. which …
1. B. Combination 2. C. Decomposition reaction 3. D. Displacement reaction 5. A. $\text{HCl} + \text{NaOH} ightarrow \text{NaCl} + \text{H}_2\text{O}$ 6. C. Forms an insoluble sol…
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directions: write the molecular formula for each of the following molec…
B. $\text{P}_2\text{O}_3$
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15.) co (1 point)○ carbon oxide○ carbon monoxide○ monocarbon monoxide○ …
Carbon Monoxide
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14.) $ce{ccl_{4}}$ (1 point)○ carbon tetrachloride○ monocarbon tetrachl…
Carbon Tetrachloride
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directions: write the name for each of the following molecular compound…
A. Dinitrogen Pentoxide
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12.) $ce{niso_{4}}$ (1 point) $\bigcirc$ nickel (i) sulfate $\bigcirc$ …
Nickel (II) Sulfate
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11.) $\text{ba(oh)}_2$ (1 point)$\bigcirc$ barium hydroxide$\bigcirc$ b…
A. Barium Hydroxide
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directions: write the name for each of the following ionic compounds. 1…
Magnesium Oxide
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9.) copper (ii) sulfate (1 point)○ $ce{cu_{2}s_{2}}$○ $ce{cuso_{4}}$○ $…
B. $\text{CuSO}_4$
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9.) copper (ii) sulfate (1 point)$ce{cu_{2}s_{2}}$$ce{cuso_{4}}$$ce{cu_…
B. $\text{CuSO}_4$
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8.) calcium oxide (1 point)$ce{ca_{2}o_{2}}$$ce{co}$$ce{cao}$$ce{caoh}$
C. CaO
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7.) ammonium carbonate (1 point) ○ $(nh_4)_2c$ ○ $al_4c_3$ ○ $al_2(co_3…
$\boldsymbol{(NH_4)_2CO_3}$
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6.) aluminum sulfide (1 point) ○ $al_3s_2$ ○ $al_2(so_4)_3$ ○ $al_2s_3$…
C. $\text{Al}_2\text{S}_3$
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directions: complete each of the following sentences by filling in the …
1.) Anions have a **negative** charge. 2.) A covalent bond is formed by a **shared** pair of electrons. 3.) An atom becomes an ion by losing or gaining **electrons**. 4.) The atom…
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counterclaim: banning plastic water bottles removes a healthy option fo…
Plastic water bottles should be banned. They cause enormous waste and environmental issues.
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $\ce{2 F_{2}(g) + O_{2}(g) -> 2 OF_{2}(g)}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2\ \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2\ \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) \to 2\ \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2 \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2\ \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(g) + \text{O}_2(g) ightarrow 2\ \text{OF}_2(g)$
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9. why are stage directions important?a. they eliminate the need for di…
9. c. They guide the actors' movements 10. a. A character's words or actions 11. a. Characters' actions and dialogue 12. d. Expressing emotions clearly through voice and body 13. …
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $\ce{2 F_{2}(g) + O_{2}(g) → 2 OF_{2}(g)}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2 \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{OF}_2(\text{g})$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2 \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{OF}_2(\text{g})$
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mayonnaise□ suspension☑ colloid□ solution□ heterogeneous mixture☑ homog…
- B. colloid - E. homogeneous mixture
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homework 6 question 4 of 20 (1 point) | question attempt: 2 of 3 fog so…
- colloid - heterogeneous mixture
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liquid soap solution colloid suspension homogeneous mixture heterogeneo…
- colloid - homogeneous mixture
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mint chocolate chip ice cream (mint ice cream + chocolate chips)□ solut…
☑ heterogeneous mixture
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blood □ solution □ suspension □ homogeneous mixture □ heterogeneous mix…
☑ suspension ☑ heterogeneous mixture ☑ colloid
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fog□ solution□ suspension□ heterogeneous mixture□ colloid□ homogeneous …
☑ colloid
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classify each of the following substances as a colloid, heterogeneous m…
☑ colloid ☑ homogeneous mixture
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part 1 of 2 how many milliliters of a 10.0 m sucrose solution would be …
57.4 mL
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what is the concentration of a solution formed by diluting 27.0 ml of a…
0.31 M
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part 2 of 2 what is the molarity of glucose in the blood? $square$ m $0…
$0.0075$ M (or $7.5 \times 10^{-3}$ M)
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part 2 of 2 510. ml of a 0.85 m solution $square$ mol nacl 1.2 mol nacl
0.43 mol NaCl
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how many moles of nacl are contained in each volume of aqueous nacl sol…
1.2 mol NaCl
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part 2 of 2 19.0 g of $\text{nahco}_3$ in 480. ml of solution. be sure …
$0.471\ \text{M NaHCO}_3$
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part 1 of 2 what is the molarity of a solution prepared using the given…
1.1 M NaCl
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part 3 of 3 55.3 g mgcl₂ in 210. ml solution □ m
2.77 M
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question 13 of 20 (1 point) | question attempt: 1 of 3 part 2 of 3 26.0…
$0.0356$ M
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part 1 of 3 calculate the molarity of each aqueous solution with the gi…
1.53 M
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part 2 of 2 $7.\\times 10^{-4}$ g in 1.9 kg minnow tissue. be sure your…
$4 \times 10^{-1}$ ppm DDT (or 0.4 ppm DDT)
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what is the concentration in parts per million of ddt in each of the fo…
0.018 ppm DDT
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part 1 of 2 a commercial rubbing alcohol contains 34. g of isopropanol …
76 % ($\frac{weight}{volume}$) isopropanol
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a 750.-ml bottle of vodka contains $2.8 \\times 10^{2}$ ml of ethanol. …
37% (v/v) ethanol
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which of these uses logos? a. yum organics has been providing well-roun…
D. All of the other schools in our district offer organic foods in the lunchroom; therefore, our school should offer organic foods as well.
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what is the $\frac{weight}{volume}$ percent concentration of the solute…
7.87 % (w/v) NaOH
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which substance can be classified as a nonelectrolyte?○ licl○ $\text{kn…
○ H₂O₂
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which of the following is classified incorrectly based upon the descrip…
All are classified correctly.
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which of the following lists the types of mixtures in order of increasi…
solution < colloid < suspension
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $\ce{2 F2(g) + O2(g) → 2 OF2(g)}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2 \text{F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{OF}_2(\text{g})$
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according to the solubility principle of \like dissolves like,\ which p…
a nonpolar molecule and a nonpolar molecule
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which is not an example of a solution? ○ a dental filling ○ chicken noo…
○ a dental filling
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the extra terrestrials who banished the imperial unit system also got a…
5
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the extra terrestrials who banished the imperial unit system also got a…
1
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how many 5s electrons does cr²⁺ have?
0
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part 3 of 3 in a can of a carbonated beverage such as soda, ____ would …
water
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in a can of a carbonated beverage such as soda, ___ would be considered…
$\text{CO}_2$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. $2\ \text{F}_2(\text{g}) + \text{O}_2(\text{g}) \to 2\ \text{OF}_2(\text{g})$
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determine the enthalpy of the reaction of $ce{hcl(g) + nano_{2}(s) -> h…
$\Delta H^\circ = +471.5\ \text{kJ/mol}$ (rounded to one decimal place, or $+471.55\ \text{kJ/mol}$ for precise value)
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oxygen is acting as an oxidizing agent in all of the following reaction…
# Explanation: ## Step1: Define oxidizing agent role An oxidizing agent gains electrons, so its oxidation number decreases. ## Step2: Find O oxidation number in reactants In $\tex…
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bend and stretch = structure and function of designed materials student…
Evidence: The C-F bond (485 kJ/mole) has higher bond energy than the C-H bond (413 kJ/mole). Reasoning: Stronger C-F bonds in PTFE require more energy to break, so PTFE is stable …
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jocelyn and her friends put some raisins, hazelnuts, almonds, and peanu…
a mixture
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part 1. complete each question using your bag of candy. show all work t…
1. 12 2. (Completed Table 1 below) 3. (Completed Table 1 below) 4. Orange, $\ce{^{7.01}O}$ (Orange-7.01) 5. 41% (highest percentage abundance) 6. ~5.78 (predicted average atomic m…
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a student selects two identical glasses, labels them p and q, and fills…
Sugar dissolves completely in glass P, and sand settles at the bottom of glass Q.
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packing peanuts are commonly used as shipping material. some are manufa…
☑ Cornstarch Evidence: Cornstarch has polar -OH groups in its molecular structure that form hydrogen bonds with water, making it water-soluble and biodegradable, so it does not co…
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three students are mixing the same type of solute in 500 ml of water. j…
Hunter → Jessica → Larry
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oil and water placed in a jar will separate. even when shaken and mixed…
Oil and water have a low solubility because they have separate chemical properties.
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naomi has increased the pressure on a solution of liquid and gas in a c…
increase the amount
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four solutes are added to a solvent. all solutes have the same mass and…
10 mm²
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ntinued)organize the information on atomic mass to complete the outline…
1. Protons (positively charged, ~1 amu mass) 2. Neutrons (neutral, ~1 amu mass) 3. Accounts for 99.9% of total atomic mass
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ii. prelab questions (answer questions in your notebook): 1. what is th…
1. $2\text{Mg} + \text{O}_2 ightarrow 2\text{MgO}$ 2. Limiting reactant: $\text{Mg}$; Excess reactant: $\text{O}_2$. Explanation: Atmospheric oxygen is infinitely abundant compare…
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maureen adds a spoonful of salt to a glass of cold water. which of the …
stirring the mixture
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read the list below: 1. sugar 2. pepper 3. lemon juice 4. carbon dioxid…
2 and 6 only
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explain to the people of westfield how the rust in their water formed.
Rust in your water forms through a chemical reaction involving the iron in your water pipes, oxygen, and water: 1. Iron from pipes reacts with dissolved oxygen and water to form i…
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3. a new childrens toy company is designing its logo. select the respon…
○ They should consider colors that are red and yellow to set the mood of energy, excitement, and youth.
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phosphorus atomic number atomic mass number of protons number of electr…
### Phosphorus | Category | Value | |------------------------|-------| | Atomic Number | 15 | | Atomic Mass | 31 | | Number of Protons | 15 | | Number of Electrons | 15 | | Number…
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boron atomic number atomic mass number of protons number of electrons n…
### Boron Table: | Category | Value | |------------------------|-------| | Atomic Number | 5 | | Atomic Mass | 11 | | Number of Protons | 5 | | Number of Electrons | 5 | | Number …
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question 1 of 15 which sentence describes a villanelle? a. it has 14 li…
C. It uses three-line stanzas and often repeats lines.
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questions to address in your conclusion: 1. what is the expected mole r…
The expected mole ratio of chlorine to magnesium is $\frac{2}{1}$ (or 2:1).
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marine debris is best described as being composed of _______. a. solid …
d. things discarded by humans
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lab #4 – empirical formula of a compound repo. name: anarec sasmiento l…
Average ratio of moles of chlorine to moles of magnesium: $18.9$ Empirical formula of magnesium chloride: $\text{MgCl}_{19}$ (Note: This non-standard result suggests possible expe…
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date trial 1 trial 2 mass of evaporating dish 46.0618g 45.5867g mass of…
Trial 1: 18.84 Trial 2: 18.96
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which statement best explains how the aswan high dam contributes to pol…
The dam affects the soil, which causes farmers to use fertilizers that create pollution.