化学
化学反应、化学计量、分子结构与元素性质。
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the properties of the new substance are from the properties of the orig…
- P: Precipitado - E: Energía - C C: Cambio de color - G: Gas
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a. o erosion b. o climate change c. o topsoil d. o horizons 4. what ter…
4. A. biota 5. D. decomposed remains of once living things
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1. what is represented by this figure? a. parent material is broken dow…
1. A. Parent material is broken down by mechanical and chemical weathering. 2. C. Climate is the average weather of an area.
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5. read the following ideas about atoms published by john dalton in 180…
1. Agree. Different elements have unique atoms. 2. Disagree. Isotopes show atomic variation within an element. 3. Disagree. Atoms have protons, neutrons, electrons.
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14. which solution would be most effective in weathering rock? add solu…
14. B. solution X 15. C. Increased surface area allows for more interactions of rocks with water and oxygen.
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11. what type of weathering is shown in the figure? a. mechanical weath…
11. A. mechanical weathering 12. D. because the temperature changes in the mountains allow for the repeated freezing and thawing of water caught in cracks of rock 13. A. erosion
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8. how does climate affect chemical and mechanical weathering? a. mecha…
8. B. Chemical weathering occurs more rapidly in warm, wet climates, and mechanical weathering occurs more rapidly in warm, wet climates. 9. C. C - horizon C 10. D. oxidation
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6. what information does the atomic number of an element tell you?
It tells you the number of protons in an element's nucleus, defining the element's identity.
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read the excerpt from the author to her book. \thou ill - formd offspri…
C. A, A, B, B
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5. how are elements arranged on the periodic table?
Elements are arranged by increasing atomic number in periods and groups based on electron - shell structure and chemical properties.
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3. a closed system is a system in which a. matter can enter and leave b…
3. d. Materia no entra ni sale 4. c. La masa no puede ser creada ni destruida en una reacción química 5. c. Igual a la masa total de los productos 6. a. Hielo derritiéndose en agu…
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3. the processes that change objects on earth’s surface over time are c…
3. D. weathering 4. B. it contributes sediment to the soil 5. A. sunlight 6. A. Mechanical weathering occurs when rocks are broken by physical processes, and chemical weathering c…
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you removed a coke can from the refrigerator. when you come back a few …
B. As water molecules in the air come in contact with the cold can, they will slow down. C. As water molecules in the warm air collide with the cold can, they will lose energy and…
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you removed a coke can from the refrigerator. when you come back a few …
B. As water molecules in the air come in contact with the cold can, they will slow down. C. As water molecules in the warm air collide with the cold can, they will lose energy and…
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4. what are the three main subatomic particles, and where are they loca…
Protons (nucleus), neutrons (nucleus), electrons (orbit - around nucleus)
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in the item bank are key terms and expressions, each of which is associ…
Phase changes that absorb heat: Sublimation, Vaporization, Melting Phase changes that release heat: Freezing, Condensation
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question 7 (1 point) which of the following is not evidence of a chemic…
B. A change in state (solid, liquid, gas)
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question 6 (1 point) listen when water freezes, what type of change occ…
Physical change
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question 5 (1 point) which of the following is an example of a chemical…
C. Baking bread
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question 4 (1 point) when a physical change occurs, the composition of …
False
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examine the model of the different states of matter. select all of the …
B. Gases have the greatest kinetic energy, D. Energy is added to change from a solid to a liquid state
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4. what term refers to the living organisms in soil? a. biota b. ph c. …
4. A. biota 5. D. decomposed remains of once living things
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1. what is represented by this figure? a. parent material is broken dow…
1. A. Parent material is broken down by mechanical and chemical weathering. 2. C. Climate is the average weather of an area.
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consider the heating curve of h2o and line segments a, b, and c. severa…
C. Space between molecules decreases
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14. which solution would be most effective in weathering rock? add solu…
14. B. solution X 15. C. Increased surface area allows for more interactions of rocks with water and oxygen.
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11. what type of weathering is shown in the figure? a. mechanical weath…
11. A. mechanical weathering 12. D. because the temperature changes in the mountains allow for the repeated freezing and thawing of water caught in cracks of rocks 13. A. erosion
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8. how does climate affect chemical and mechanical weathering? a. mecha…
8. B. Chemical weathering occurs more rapidly in warm, wet climates, and mechanical weathering occurs more rapidly in cold climates 9. C. C - horizon C 10. D. oxidation
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3. the processes that change objects on earths surface over time are ca…
3. D. weathering 4. B. it contributes sediment to the soil 5. A. sunlight 6. A. Mechanical weathering occurs when rocks are broken by physical processes, and chemical weathering h…
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name: q1 chemistry: u1l4 mixture types part 2: summarize the separation…
| Type of Separation | When to Use It | Write a Summary | | --- | --- | --- | | Distillation | Separate liquid - liquid mixtures with different boiling points | Heat mixture, vapo…
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4. how many protons are found in an atom of sulfur - 32? 5. how many el…
4. 16 5. 80 6. Selenium (Se) 7. $^{14}_7N$ 8. $^{92}_{40}Zr$ 9. $^{48}_{23}V$ 10. $^{98}_{42}Mo$
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part 3: multiple choice questions 1. **which separation technique is be…
1. C. Filtration 2. C. Boiling point 3. B. Colored pigments in ink 4. C. Evaporation 5. B. Removing water from cooked pasta 6. C. Density
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part e. complete the following table: assume all atoms are neutral. iso…
| isotope symbol | nuclear symbol | mass number | number of protons | number of neutrons | number of electrons | atomic number | |---|---|---|---|---|---|---| | carbon - 12 | $_{6…
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part e. complete the following table: assume all atoms are neutral. iso…
|isotope symbol|nuclear symbol|mass number|number of protons|number of neutrons|number of electrons|atomic number| |---|---|---|---|---|---|---| |carbon - 12|$^{12}_{6}C$|12|6|6|6…
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gabe amodeo, a nuclear physicist, needs 60 liters of a 60% acid solutio…
40
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gabe amodeo, a nuclear physicist, needs 60 liters of a 60% acid solutio…
20
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2. dé los nombres iupac para los siguientes compuestos: (a) ch3 ch3chch…
# Explicación: ## Paso 1: Identificar la cadena principal Para el compuesto (a) $CH_3CHCH_2CH_2CH_3$ con un grupo metilo en el carbono 2, la cadena principal tiene 5 átomos de car…
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18 question (8 points) in the blanks provided, write the name of each f…
A. Ether B. Ketone C. Alcohol D. Ester E. Aldehyde F. Alkyne G. Amine
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2. dé los nombres iupac para los siguientes compuestos: (a) ch3 ch3chch…
(a) 2 - metilpentano (b) 2,2 - dimetilbutano
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3. use dimensional analysis, convert 6.2 x 10^21 cl to zl. be sure to s…
\(6.2\times 10^{-42}\text{ ZL}\)
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2. please do the following calculations and round your answer to the co…
a. $3.8\ g/mL$ b. $1.0\times10^{2}\ m^{2}$ c. $7.01\ mg$
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practice it! which of the following are properties of liquids? takes th…
takes the shape of its container, definite volume, able to move and flow
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1. determine the number of significant figures in the following numbers…
a. 2 significant figures b. 3 significant figures c. 4 significant figures d. 3 significant figures
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a researcher dispenses distilled deionized water from a 20 - ml transfe…
c. 20.167 d. 20.23
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four students made a graphic organizer describing the parts of the atom…
None of the given tables are correct. Proton: +, inside nucleus; Electron: -, outside nucleus; Neutron: 0, inside nucleus.
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drag and drop the words or phrases that accurately complete the paragra…
First blank: mass Second blank: volume Third blank: temperature Fourth blank: texture
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how does a catalyst influence a chemical reaction? it speeds up or slow…
It decreases the amount of energy necessary for the reaction to proceed.
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which reaction is exothermic? a reaction that absorbs energy from the e…
C. a reaction that releases energy into the environment
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a student has an unknown sample. how can spectroscopy be used to identi…
It can identify the elements in the sample.
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which component is affected when a catalyst is added to a chemical reac…
the activation energy
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06 question (1 point) which of the following compounds contain any ioni…
Compounds with a metal (like the one with Na) contain ionic bonds. Compounds made up of only non - metals (such as hydrocarbons, alcohols etc. among the given structures without m…
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select the word that means a horrible odor. the durian fruit of asia is…
stench
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read the passage. the stinky durian fruit the durian is an asian fruit …
Scientists found that a combination of different chemicals is responsible for the durian's powerful odor.
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
peel off the first glove
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
grasp the exterior of one glove with a gloved hand
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what is an impact of farmers using chemicals to replace nutrients in th…
D. Chemicals in the soil can pollute the water system.
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multiple - choice question vertical columns are called groups periods r…
groups
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the average atomic mass of boron is 10.81 amu. based on the atomic mass…
D. 10.009 amu
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what is the oxidation state of nitrogen in n₂? a. +3 b. -3 c. 0 d. +5
C. 0
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what is the horizontal rows on the periodic table called? group period …
B. Period
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how are all atoms similar? a. they are made up of the same types of par…
A. They are made up of the same types of particles.
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which reaction occurs at the anode in an electrochemical cell? a. zn(s)…
D. $Zn(s) ightarrow Zn^{2 + }(aq)+2e^{-}$
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question 26 of 30 what mass of methanol (ch3oh) is produced when 86.04 …
D. 96.12 g
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multiple - choice question what does the 6 represent atomic mass (the a…
Atomic Number (the number of protons in the atom)
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which statement best describes the science of chemistry? a. chemistry i…
D. Chemistry is mainly the study of the composition of and changes in matter.
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
A. When everyone in the room is done handling any chemicals or glassware
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multiple - choice question what does the c represent
Chemical Symbol
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multiple - choice question the zig zag is made of metalloids metals non…
metalloids
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what is the percent yield for the reaction below when 364 g so2 and 42.…
# Explanation: ## Step1: Calculate moles of reactants Molar mass of $SO_2$ is $64.07\ g/mol$, so moles of $SO_2=\frac{364\ g}{64.07\ g/mol}\approx 5.68\ mol$. Molar mass of $O_2$ …
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4. describe the difference between the arrangement of atoms in solids, …
4. Solids: closely - packed, regular pattern, little movement; Liquids: close together, can move past one another; Gases: far apart, move freely. 5. a. In the gas state, atoms mov…
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question 22 of 30 which reaction occurs at the cathode of a galvanic ce…
A. $Zn^{2+}(aq)+2e^-\to Zn(s)$
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18 multiple - choice question non metals are located to the right of th…
to the right of the zigzag
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which is the balanced version of the half - reaction below? h2s → s + h…
A. $H_2S ightarrow S + 2H^+ + 2e^-$
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where does oxidation occur in an electrochemical cell? a. cathode b. an…
B. Anode
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what is the oxidation state of p in ca3(po4)2? a. +5 b. +3 c. -5 d. -3
A. +5
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question 18 of 30 why do scientists use models of molecules? a. to show…
A. To show the structure of molecules, which are too small to see
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multiple - choice question most elements are metals non - metals
Metals
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what is oxidized in the reaction below? h2 + cl2 → 2hcl a. h2 b. cl2 c.…
A. $H_2$
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question 16 of 30 how are elements with similar properties grouped in t…
A. In the same column
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question 15 of 30 the theoretical yield of ammonia in a reaction is 865…
B. 76.0%
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question 14 of 30 what is the cell potential of an electrochemical cell…
D. 1.24 V
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question 13 of 30 the half - reaction at the anode in an electrochemica…
A. $Ni^{2+}(aq)+2e^{-}\to Ni(s)$
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multiple - choice question how did mendeleev arrange his elements? incr…
Increasing atomic mass
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question 12 of 30 why are the oxidation and reduction half - reactions …
D. So that electricity will flow through the wire connecting the halves of the cell
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practice: determining formulas part 1: determine the empirical formula …
1. $MgBr_{2}$ 2. $CH_{4}$ 3. $Na_{2}SO_{4}$ 4. $AlPO_{4}$ 5. $AgNO_{3}$ 6. $AgNO_{3}$ 7. $C_{6}H_{6}$
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13 multiple - choice question who is the father of the periodic table? …
B. Mendeleev
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question 11 of 30 what is added to balance hydrogen and oxygen atoms in…
A. $\text{OH}^-$ and $\text{H}_2\text{O}$
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question 10 of 30 the reaction of hydrogen with nitrogen to produce amm…
D. 4
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2. dó los nombres iupac para los siguientes alcanos y convierta cada re…
No se puede determinar sin una imagen más clara.
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question 9 of 30 what happens to elemental copper when it loses two ele…
C. It is oxidized to $Cu^{2+}$
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2. de los nombres iupac para los siguientes alcanos y convierta cada re…
# Explicación: ## Paso 1: Identificar la cadena principal En un alcano, la cadena principal es la más larga. Debemos contar los átomos de carbono en la cadena más larga. ## Paso 2…
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question 8 of 30 what is the balanced equation for the redox reaction b…
D. $Ag + 2H^+ + NO_3^- ightarrow NO_2 + Ag^+ + H_2O$
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question 7 of 30 which of the following processes involves an oxidation…
D. Electroplating
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question 6 of 30 the average atomic mass of carbon is 12.01 amu. based …
D. There is a very large percentage of C - 12.
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question 5 of 30 which redox reaction would most likely occur if zinc a…
A. $\mathrm{Cu^{2 +}+Zn ightarrow Cu + Zn^{2+}}$
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question 4 of 30 what is the source of the ions involved in a redox rea…
A. Electrolyte solutions
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which would most likely be reduced when combined with cu(s)? click for …
C. $Au^{+}$
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question 2 of 30 which term describes the total voltage of a redox reac…
C. Negative
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question which functional group is not present in this molecule? answer…
C. Sulfhydryl
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question 1 of 30 which of the following is most easily reduced? click f…
A. $Ag^+$
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choose the term that correctly describes the relationship between these…
Structural isomers