化学
化学反応、化学量論、分子構造、元素の性質。
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unit 3 chem l test 2526 convert 2.5 moles of tin (sn) into atoms of tin…
1.5×10²⁴ atoms
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unit 3 chem l test 2526 which of the following would best be measured i…
particles of sand on the beach
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unit 3 chem l test 2526 what is the molar mass of iron (fe)? 26 g/mol 8…
C. 55.845 g/mol
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an electron in which energy level would have the most energy? 1st energ…
B. 3rd energy level
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which experiment lead to the discovery of the atomic nucleus? thomson -…
C. Rutherford - Gold Foil
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table 6 - 1 gives information about the nuclei of four atoms. how many …
2 (corresponding to the first option in the multiple - choice list)
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three naturally occurring isotopes of neon exist. looking at the period…
Neon - 20
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how many neutrons are in an atom represented by $_{88}^{220}ra$? 308 13…
B. 132
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the of an atom is extremely dense. it has a very small and a large time…
The first blank: nucleus; The second blank: volume; The third blank: mass
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an element has two naturally - occurring isotopes. isotope a has a mass…
63.6
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unit 3 chem l test 2526 figure 6 - 13 is a diagram of which element? he…
oxygen
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part 3 isotopes: use the information filled into the table to help you …
1. An atom is the basic unit of an element. Isotopes are atoms of the same element with different neutron numbers. 2. They have the same number of protons and electrons (in neutra…
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list the three main subatomic particles in alphabetical order below.
1. electrons 2. neutrons 3. protons
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unit 3 chem l test 2526 figure 6 - 8 represents the nucleus of an atom.…
The atomic number is 9 and the mass number is 20.
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figure 6 - 14 shows a boron atom. w = nucleus, x = neutrons, y = proton…
C. Letter Y
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unit 3 chem l test 2526 which of the following has a positive charge? n…
C. protons
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in 1803, the english chemist john dalton formulated an atomic theory be…
2
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question 10 2 pts a metal sphere weigh 2.403 g is added to 15.0 ml wate…
1.4 g/mL
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unit 3 chem l test 2526 which set of atomic models shows the correct or…
The last option (golden sphere, red cross - circle, white circle with central mass and some dots, white circle with orbiting electrons around central mass, blue cloud - like) show…
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what determines a minerals unique characteristics? o age and location w…
D. Chemical composition and crystal structure
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which of the following subatomic particles gives the nucleus of an atom…
D. both protons and neutrons
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the are located in group 18 and have such a lack of reactivity with oth…
noble gases
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unit 3 chem l test 2526 which of the following subatomic particles are …
B. electrons
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post lab quiz - determining the density of a solid and liquid started: …
Precisely fill a tared volumetric flask with liquid and record the mass.
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unit 3 chem l test 2526 which subatomic particle gives the atom its ide…
protons
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unit 3 chem l test 2526 which of the following has a negative charge? ○…
electrons
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zzes > post lab quiz - determining the density of a solid and liquid la…
B. graduated cylinder
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post lab quiz - determining the density of a solid an started: sep 16 a…
B. g/mL
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go to www.periodictable.com and hover over each of the crystallogens. w…
Please visit www.periodictable.com, hover over each Crystallogen and record 2 - 3 interesting facts as per the instruction. No specific facts are provided here as they need to be …
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chlorine determine the ionic name. ion write the chemical symbol and ch…
Ion name: Chloride Chemical symbol and charge: $Cl^-$, - 1 Ionic charge of - 1 is achieved when the atom gains 1 electron.
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enthalpy changes for solids and liquids example 3 - 6: 20.0 g of nh4no3…
\(21.1\text{ kJ/mol}\)
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answer each question about the following atom when it becomes an ion. p…
Ion: Potassium ion Chemical symbol and charge: $K^{+}$ The ionic charge of + 1 is achieved when the atom loses 1 electron.
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selenium determine the ionic name. write the chemical symbol and charge…
Ionic name: Selenide Chemical symbol and charge: $Se$, $2 - $ The ionic charge of $Se^{2 - }$ is achieved when the atom gains 2 electrons.
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atoms, ions, and isotopes part 1 vocab: use the word bank to answer the…
See the above - filled tables and explanations for all parts.
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group #: 2 draw the example atom and make the outermost electron(s) in …
Group #: 14 Family Members: C (6), Si (14), Ge (32), Sn (50), Pb (82), Fl (114) Uses/Existences: 1. Carbon - basis of organic compounds, used in fuels. 2. Silicon - in semiconduct…
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according to the concept of entropy, what will likely happen to most mo…
They will break down.
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calculate the following using proper number of significant figures: 0.0…
B. 0.0520
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which property of water is best described as the tendency of water mole…
B. cohesion
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atoms, ions, and isotopes part 1 vocab: use the word bank to answer the…
1. An atom is neutral; an ion is charged due to gain or loss of electrons. 2. Both have protons, neutrons in the nucleus and are composed of sub - atomic particles. 3. For neutral…
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which property of water is likely the most significant in water’s role …
The electrons in water are shared unequally, creating a slight charge.
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atoms of which three elements could bond together to form an organic co…
D. carbon, hydrogen, and oxygen
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part 3 isotopes: use the information filled into the table to help you …
1. An atom is the basic unit of an element. Isotopes are atoms of the same element with different neutron numbers. 2. They have the same number of protons and electrons (in neutra…
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which of the following properties is not significantly influenced by di…
Mass
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which of the following is not true about dipole - dipole forces? they a…
They occur between all molecules.
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the dots in each diagram represent valence electrons orbiting the nucle…
A.
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4. what type of intermolecular force is unique to alcohols and signific…
Hydrogen bonding
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how many atoms can one carbon atom bond to? o up to 8 o up to 4 o a min…
up to 4
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8. how can you experimentally determine the relative evaporation rates …
Measure the change in mass of each liquid over time
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4. what type of intermolecular force is unique to alcohols and signific…
Hydrogen bonding
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which of the following factors can influence the strength of london dis…
All of the above
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which statement about hydrogen bonds and covalent bonds is true? covale…
Covalent bonds occur between atoms in the same molecule while hydrogen bonds between atoms of different molecules.
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5. which of the following is not a characteristic of hydrogen bonds? th…
They are stronger than covalent bonds
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which statement best explains why a carbon atom can form a variety of c…
It can bond with up to 4 other atoms.
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which of the following is not true about london dispersion forces? they…
They are stronger than dipole - dipole interactions.
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which statement about organic compounds is true? o organic compounds mu…
Organic compounds must contain carbon atoms bonded to other atoms.
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atoms, ions, and isotopes part 1 vocab: use the word - bank to answer t…
1. An atom is neutral; an ion has a charge due to electron gain or loss. 2. Composed of same sub - atomic particles and same element if proton number is the same. 3. Neutral Alumi…
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which type of bond holds atoms together in a water molecule? o dispersi…
B. covalent bond
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what element do all organic compounds have? o hydrogen o chlorine o sod…
carbon
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what does a process flow diagram for a chemical plant show? the molecul…
The flow of energy and matter through the system
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what does a process flow diagram for a chemical plant show? the color o…
C. The flow of energy and matter
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a polysaccharide is a type of polymer. polymers are molecules made of m…
The third structure is the polysaccharide.
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12. what did all indicators have in common? 13. what was the purpose of…
12. They change color depending on pH. 13. To act as a control or to avoid interference from impurities. 14. Cannot be determined without more information.
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steroids are another type of lipid. steroids function as chemical messe…
Steroids have carbon atoms arranged in rings. Steroids help regulate growth in the body.
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a disaccharide is a carbohydrate made of two monosaccharides bonded tog…
Beets are a source of sucrose. Sucrose can be made in plant cells.
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rosa was looking for patterns to help predict the products of chemical …
$2LiCl + 3O_2$
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what else is produced during the combustion of propane, c₃h₈? c₃h₈ + 5o…
$H_2O$
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what else is produced when sodium carbonate decomposes? na2co3 → na2o +
$CO_2$
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luis is helping his parents paint a border around the walls of a room. …
synthesis
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monosaccharides are the building blocks of carbohydrates. they may be f…
| | glucose | fructose | galactose | |--|--|--|--| | has 12 hydrogen and 6 oxygen atoms | √ | √ | √ | | is a monosaccharide | √ | √ | √ | | has a 6 - atom ring | √ | × | √ |
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which clue can be used to identify a chemical reaction as a replacement…
The reaction has two reactants with ions that seem to switch places.
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when explaining chemical reactions to a friend, brianna models a reacti…
synthesis
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what else is produced during the combustion of butane, c4h10? 2c4h10 + …
Carbon dioxide (\(CO_{2}\)) and water (\(H_{2}O\))
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what else is produced during the combustion of butane, c₄h₁₀? 2c₄h₁₀ + …
Nothing else is produced.
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what is the formula for phosphorus pentabromide? pbbr₅ pbr₅ p₂br₅ kbr₅
B. PBr₅
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what is the formula for dioxygen difluoride? of o₂f o₂f₂ of₂
$O_2F_2$
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which clue can be used to identify a chemical reaction as a combustion …
A. A hydrocarbon reacts with oxygen.
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which type of reaction is nacl + agno3 → nano3 + agcl? synthesis decomp…
replacement
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what is the formula for bromine trifluoride? 3brf bf₃ brf₃ bfr₃
BrF₃
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a chemical reaction that has the general formula of na→(a)n is best cla…
polymerization
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covalent formulas what is the formula for sulfur trioxide? so so₂ so₃ h…
$SO_3$
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what is the formula for carbon tetrachloride? cacl4 clc4 ccl4 ccln
C. $CCl_4$
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____ is water that arises as a byproduct of chemical reactions that rel…
C. Metabolic water
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fill in the blank question as blood glucose levels fall, stored molecul…
glycogen
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water is considered a polar molecule because: o a it has oppositely cha…
1. a. It has oppositely charged regions due to unequal charge distribution 2. c. Water 3. c. Attraction between water and other substances
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question 11 air density is 1.29 kg/m³ at sea - level and comprises 23% …
(a) The mass of O₂ inhaled each day is 2.56 kg (rounded to two - decimal places). (b) The number of O₂ molecules is $4.82\times10^{25}$ molecules (rounded to two - decimal places).
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what is the name of the compound ccl4? calcium pentachloride carbon tri…
carbon tetrachloride
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what is the name of the compound c3h6? tricarbon hexahydroxide exacarbo…
tricarbon hexahydride
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what is the name of the compound sbr2? disulfur bromide sulfur dibromid…
sulfur dibromide
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what is the name of the compound c4n3? carbon trinitride tetracarbon tr…
tetracarbon trinitride
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select all that apply which of the following statements about metabolic…
It contributes to fluid balance, It is a byproduct of chemical reactions in the body
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what is the name of the compound n2o3? nitrogen trioxide nitrogen oxide…
dinitrogen trioxide
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physical change burning toast * 1 point chemical change physical change…
For "burning toast": chemical change For "melting ice cream": physical change
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cream being whipped * chemical change physical change freezing chocolat…
1. B. physical change 2. B. physical change 3. A. chemical change
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pouring milk on cereal * chemical change physical change burning leaves…
1. B. physical change 2. A. chemical change 3. B. physical change
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fireworks exploding * chemical change physical change squeezing oranges…
1. chemical change 2. physical change 3. chemical change
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mowing the lawn * chemical change physical change corroding metal * che…
1. mowing the lawn: physical change 2. corroding metal: chemical change 3. bleaching your hair: chemical change
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what is the name of the compound n2o3? nitrogen trioxide nitrogen oxide…
dinitrogen trioxide
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5. draw examples of atoms in the space on the left, and compounds on th…
For atoms: Draw simple circles with element symbols (e.g., 'H' for hydrogen atom). For compounds: Represent atoms that make up the compound (e.g., $H_2O$ as two H and one O). For …
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question 5 (5 points) listen which of the following is not human - caus…
Question 5: D. Water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. Question 6: B. Caves and sinkholes
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question 3 (5 points) listen all of the following are examples of organ…
Question 3: B. water Question 4: A. Acid from abandoned mines, B. Water from a sewage treatment plant