Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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which of the following is not considered part of the organic fraction a…
Question 1: C. Sand Question 2: A. Moist
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to raise the ph of a soil, apply a product containing a lime b sulfur c…
Question 1: A. Lime Question 2: C. all of the above
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8. suppose each of these isotopes emits an alpha particle. give the iso…
a. Osmium - 171, $_{76}^{171}\text{Os}$ b. Samarium - 145, $_{62}^{145}\text{Sm}$ c. Neptunium - 237, $_{93}^{237}\text{Np}$ d. Radium - 228, $_{88}^{228}\text{Ra}$
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2. suppose each of these isotopes emits a beta particle. give the isoto…
a. Calcium - 42, $_{20}^{42}Ca$ b. Xenon - 131, $_{54}^{131}Xe$ (✓) c. Cobalt - 52, $_{27}^{52}Co$ d. Magnesium - 24, $_{12}^{24}Mg$ (✓)
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in comparison to molecules that interact by london dispersion forces on…
D. higher
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icl has a higher boiling point than br2. what is the best explanation f…
ICI experiences dipole - dipole interactions.
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are hydrogen bonds formed between all molecules? no because hydrogen ca…
No because hydrogen can only form these bonds with highly electronegative atoms.
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which statement best explains why water has a higher boiling point than…
D. Ethane molecules have no hydrogen bonds and need less energy to separate.
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which statement about van der waals forces is true? when the forces are…
When the forces are weaker, a substance will have higher volatility. When the forces are stronger, the boiling point of a substance will be higher.
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charge are blue. the molecule on the right is nonpolar. what will most …
An induced dipole will be produced in the molecule on the right.
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substances x and y are both nonpolar. if the volatility of x is higher …
Y's molecules experience stronger London dispersion forces than X's molecules.
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when a polar molecule causes a charge redistribution in a nonpolar mole…
C. dipole - induced dipole interactions
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which compound is an exception to the octet rule? o h₂o o hcl o ccl₄ o …
D. $ClF_3$
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which compound is an exception to the octet rule? o h₂o o hcl o ccl₄ o …
D. $BF_3$
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a solid compound in a sealed container was kept at a very low temperatu…
D. a covalent compound because it has a low melting point
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which statement about covalent compounds is true? they are able to melt…
They are poor conductors of heat.
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which characteristic best explains the difference in melting behavior o…
C. Covalent substances have weaker intermolecular attractions.
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how many valence electrons are available for bonding in silicon? four f…
A. four
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which type of bond will form between two chlorine atoms? an ionic bond …
D. a nonpolar covalent bond
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which element has the greatest number of valence electrons available fo…
D. chlorine
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which statement describes a property of covalent compounds? they have a…
They have a low boiling point because of weak intermolecular forces.
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which type of bond will most likely be found in hbr given that the elec…
a polar covalent bond
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which compound contains only a nonpolar covalent molecule? o o₂ o hcl o…
A. $O_2$
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which property best indicates that a compound contains an ionic bond? i…
It conducts electricity when molten.
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which statement describes a step in the formation of an ionic bond? an …
A metal atom forms a cation, and a nonmetal atom forms an anion.
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which statement is true about ionic compounds? they are made up of many…
They are made up of particles that are arranged in a repeating pattern.
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which of these best describes an ionic bond? o a force that keeps two l…
a force that holds two oppositely charged ions together
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which statement best describes how an ionic bond forms? the transfer of…
The transfer of electrons forms strong bonds between ions.
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which pair of ions can form an ionic bond with each other and why? o cu…
Li⁺ and Br⁻; They have unlike charges.
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what leads to the formation of an ionic bond with hg²⁺? the attraction …
D. the attraction of an $SO_{4}^{2 - }$ ion
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which property is best to use when determining the strength of an ionic…
lattice energy
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which statement correctly describes the phosphate ion, po₄³⁻? it is com…
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a -3 charge distributed over the entire ion.
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which of the following can easily form an ionic bond with a cation? sr …
D. $PO_4^{3 - }$
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the closeness of particles of gas and their low speeds allow intermolec…
This is a limitation of the kinetic - molecular theory.
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why are liquids well suited for hydraulics? liquids have low densities.…
Liquids are incompressible.
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a solid substance turns directly into a gas. which term describes this …
D. sublimation
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to observe a property of a substance, the substance must interact with …
chemical
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liquids and solids are referred to as \condensed phases\ because the at…
leave little space between the molecules.
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which is the best example of immiscible liquids? o two polar liquids th…
D. a polar liquid and a nonpolar liquid that do not dissolve into one another
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which statement best explains why heating a liquid affects its viscosit…
The molecules move faster at higher temperatures and overcome attractions more easily.
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which statement describes an intensive property of matter? it is the sa…
It is the same for every sample of a single substance.
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a perfume bottle is dropped in the corner of a room and it shattered. t…
Particles are moving from regions of high concentration to low concentration.
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waters molar mass is 18.01 g/mol. the molar mass of glycerol is 92.09 g…
glycerol because it is more viscous and has a larger molar mass
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malia was able to make a paperclip float on the surface of water. what …
Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.
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which of the following best identifies where long - range order would b…
in crystalline solids
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which process is a chemical change? burning a match boiling water melti…
burning a match
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a student is using a copper strip and a strong chlorine solution in her…
B. reactivity of the copper strip
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according to émile durkheim, what is the basis for the bonds created th…
difference, interdependence, and individual rights
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about 21% of earths atmosphere is composed of oxygen. oxygen can combin…
B. Oxygen has chemically reacted with minerals in the rock; oxidation has occurred.
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a sample of an unknown pure substance x is analyzed and found to contai…
A. mixture B. mixture C. mixture
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | | ---- | ---- | ---- | ---- | ---- | | neutron | n | 0 | 1.0 | A | | neutron | n | 0 …
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in your chemistry class, your final grade is based on four categories. …
$50.00\%$
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a compound is found to contain 26.56% potassium, 35.41% chromium, and t…
A. $K_2Cr_2O_7$
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a compound is found to contain 63.52% iron and 36.48% sulfur. its empir…
B. FeS2
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the empirical formula and molecular formula of a compound can never be …
False
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80.0 g of i2o5 reacts with 28.0 g of co per the reaction i2o5 + 5 co-> …
B. 50.7g, 40.1% (Note: There is an issue with the percent - yield calculation based on the values given in the problem, but based on the options and the correct theoretical - yiel…
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for c3h8 + o2 -->co2 + h2o, the coeff for balanced equation are ___, an…
A. 1,5,3,4, oxygen
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limiting reagent for a reaction can vary with experiment. it depends on…
True
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limiting reagent gets completely usedup in the reaction true false cont…
True
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for this given reaction 2 naoh + cl2 --> naocl + nacl + h2o, 80g of nao…
A. 18 g of water is formed
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in comparing the mass% of c in ch3cooh and ch2o, a mass% of c in ch3coo…
A. mass% of C in CH3COOH is same as in CH2O
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the following two powders are made of different elements. the black pow…
B. Carbon and sulfur are both made from atoms. C. Sulfur has an atomic number of 16 on the periodic table.
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a mixture is made by combining 1.67 lb of salt and 4.22 lb of water. wh…
$28.35$
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how many total atoms are in 0.800 g of p₂o₅? total atoms:
$2.38\times 10^{22}$ (rounded to 3 significant - figures)
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what is the formula for copper(ii) phosphate? capitalization and punctu…
$6.50\times 10^{24}$
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in each row check off the boxes that apply to the highlighted reactant.…
| Reaction | Lewis acid | Lewis base | Brønsted - Lowry acid | Brønsted - Lowry base | |--|--|--|--|--| | $HClO(aq)+(CH_3)_3N(aq) ightarrow ClO^-(aq)+(CH_3)_3NH^+(aq)$ | | $(CH_3)…
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check all that apply: 18.01 g is the ____________ of water formula weig…
formula weight, molecular weight, molar mass
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suppose a 0.010 m aqueous solution of sulfuric acid (h₂so₄) is prepared…
$4.5\times10^{-3}M$
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check all that apply: 31.9988 amu is the ____________ of oxygen. formul…
molecular weight
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check all that apply: 42.394 amu is the ____________ of lithium chlorid…
formula weight
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if gabi and her grandfather are looking at a picture book of animals, a…
object permanence
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you need to prepare 200 ml of a 10% v/v ethanol solution using a 30% v/…
40 mL
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hazardous waste laws transportation the department of transportation (d…
C. Department of Transportation (DOT)
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hazardous waste laws resource conservation and recovery act (rcra) two …
monitoring hazardous chemicals throughout their entire lifecycle
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which of these is the most persistent (stays the longest) in the enviro…
DDT and other chemicals like it
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particles are not so closely spaced and slide past each other. solid ga…
liquid
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particles move relative to each other, but remain in contact with each …
liquid
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particles are widely spaced except when they collide. solid liquid gas
gas
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most of these elements are gases and are located on the right side of t…
B. Nonmetals
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these elements are found along the zig - zag line on the periodic table…
Metalloid
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the region around the nucleus that takes of the most volume of the atom…
Electron Cloud
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1pt which of the following four choices best describes the octet rule? …
A. Elements will typically react if they have less than eight electrons in their valence shell.
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a. the number of electrons used is incorrect. b. the orbitals are not i…
C. The orbital diagram violates Hund's rule.
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1pt which of the following four letters does not represent an orbital? …
B. g
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1pt what does an orbital diagram tell about a given element? a. the num…
D. all of the above
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a. the 2s orbitals are filled. b. the 3p orbitals are filled. c. the or…
A. The 2s orbitals are filled.
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1pt what word is used to describe electrons in the outermost energy lev…
D. valence
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a. si b. o c. f d. xe
A. Si
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the region around the nucleus that takes of the most volume of the atom…
Electron Cloud
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the horizontal rows on the periodic table #1 - 7. element group atomic …
Periods
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which of the following statements provides information about the magnet…
B. An electron occupies an orbital with another electron having a spin of -½.
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the majority of elements are classified as _______ and are located on t…
Metals
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a substance composed of two or more elements chemically bonded together…
C. Compound
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the chart that shows the arrangement of elements in order by their atom…
B. Periodic Table
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a pure substance that cannot be separated or broken down into simpler s…
D. Element
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this subatomic particle always identifies the identity (name) of the el…
Proton
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the vertical columns on the periodic table #1 - 18 subatomic particles …
B. Groups
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this number is the top number in the box on the periodic table and alwa…
Atomic Number
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the sum of the protons and neutrons in the nucleus of an atom. atomic n…
Mass Number (also called Atomic Mass)
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what is the ability of a substance to dissolve into another substance? …
D. Solubility