Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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question 25 of 25 which of the following has the largest radius? a. k b…
A. K
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question 24 of 25 how can the number of core electrons be determined fr…
D. By finding the atomic number minus the group number
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question 22 of 25 how many oxygen atoms are in a molecule of table suga…
D. 11
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question 20 of 25 what is the correct electron configuration for an ele…
D. \(1s^22s^22p^63s^23p^3\)
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question 19 of 25 which of the following is the correct name for $\\ce{…
B. Chromium(III) oxide
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question 18 of 25 what is a molecular dipole moment? a. the arrangement…
B. A separation of charge forming a positive and a negative end of a molecule
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question 17 of 25 which electrons in an atom have the highest energy? a…
C. The valence electrons
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question 16 of 25 which term describes this molecular shape? x - a - x …
C. Trigonal planar
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question 15 of 25 how does a lone pair distort the molecular shape? a. …
C. The lone pair forces bonding atoms away from itself.
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question 13 of 25 which sentence describes two atoms that form an ionic…
C. The difference in their electronegativities is greater than 1.7.
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question 12 of 25 in which situation would dipole-dipole forces be sign…
B. When molecules have permanent dipole moments
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what does the vsepr theory predict? a. the size of a molecule b. the ch…
C. The shape of a molecule
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question 10 of 25 which of these elements has the smallest first ioniza…
C. Rb
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question 10 of 25 which of these elements has the smallest first ioniza…
C. Rb
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question 9 of 25 what happens to the atomic radius when an electron is …
A. The positive ionic radius is smaller than the neutral atomic radius.
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question 8 of 25 which sentence describes the bond formed between two i…
D. The electrons involved in the bond are shared equally between the atoms.
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3.5.2 test (cs1): computer-scored unit test which h₂s molecules dipole …
B. \( \boldsymbol{\delta^+}\ce{H - \overset{\delta^-}{S} - H^{\delta^+}} \) with the dipole moment arrow pointing upward (toward S)
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question 6 of 25 why are prefixes used in naming covalent compounds? a.…
C. The same atoms can combine in more than one ratio.
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question 5 of 25 how many total electrons can the d orbitals hold? a. 1…
A. 10
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question 4 of 25 which of the following is a binary compound? a. cao b.…
A. $\ce{CaO}$
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question 3 of 25 in which situation would hydrogen bonding be present? …
C. When hydrogen is attached to N, F, or O
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question 2 of 25 which molecule or ion has a linear shape? a. becl₂ b. …
A. \( \text{BeCl}_2 \)
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question 1 of 25 what is the general trend in electronegativity as you …
D. Electronegativity increases.
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when food is exposed to air, it can lose electrons. this loss of electr…
B. Free radicals
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question 10 of 10 how are prefixes used to name compounds? a. prefixes …
C. Prefixes are used to tell how many of each kind of atom are in covalent compounds.
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question 9 of 10 which of the following is the correct name for $\\ce{n…
C. Dinitrogen pentasulfide
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question 7 of 10 what is used to determine the number of each atom in a…
D. The oxidation state of each atom
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question 6 of 10 which of the following is the correct formula for sili…
D. $\ce{SiO_2}$
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question 5 of 10 why are prefixes not used in naming ionic compounds? a…
C. Two ions can combine in only one combination.
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question 4 of 10 which of the following is the correct formula for alum…
A. $Al_2O_3$
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question 3 of 10 what is the most likely oxidation state of nitrogen? a…
A. -3
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which of the following is the correct name for bacl₂? a. monobarium dic…
C. Barium chloride
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question 10 of 10 what shape would a molecule with two bound groups and…
B. Bent
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question 9 of 10 if there were only three electron groups around an ato…
D. They would be arranged in a trigonal planar orientation.
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question 8 of 10 what is a lone pair? a. two pairs of electrons that fo…
D. A pair of electrons that is not used in bonding
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question 7 of 10 how does the shape of a molecule affect the polarity o…
A. A molecule that has a symmetrical shape will be a nonpolar molecule.
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if two atoms are bonded to a central atom with no lone pairs, how will …
B. In a linear shape
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question 5 of 10 which of the following molecules has a trigonal pyrami…
D. $\ce{XeO_3}$ (the molecule with central Xe and three O atoms attached)
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question 4 of 10 what is a consequence of electron - pair repulsion aro…
C. The atoms sharing the electron pairs will spread out around the central atom.
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question 3 of 10 how does the shape of a molecule affect its function? …
A. The shape of a molecule determines its properties and interactions.
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what does the vsepr theory describe? a. how atomic radii change during …
D. Why molecules have different shapes
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question 1 of 10 what would cause the shape of a molecule to be tetrahe…
B. Four atoms bound to a central atom with no lone pairs
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question 10 of 10 what do van der waals forces do? a. they stimulate hy…
D. They form temporary, weak dipole attractions between molecules.
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question 9 of 10 which of the following interactions is not a type of i…
B. Covalent bonds
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question 8 of 10 what do dipole-dipole forces do? a. hold nonpolar mole…
C. Hold polar molecules together
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question 7 of 10 what kind of bonds are hydrogen bonds? a. an intramole…
C. Strong polar attractions between molecules involving H, F, O, and N
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question 6 of 10 which of these molecules has an overall dipole moment?…
C. \( \text{H}_2\text{S} \)
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question 5 of 10 which of the following is a result of intermolecular f…
B. Hydrogen bonds
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question 4 of 10 how does molecular shape affect polarity? a. if the mo…
A. If the molecule is symmetrical, the effects of polarity will cancel out.
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question 3 of 10 what kind of covalent bond involves an even sharing of…
B. A nonpolar covalent bond
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question 2 of 10 what does the presence of a polar covalent bond show a…
D. The electronegativities of the two atoms are not equal.
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question 1 of 10 which of the following molecules contains a nonpolar c…
A. $H_2$
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question 10 of 10 what kind of bond would many atoms of the same metal …
C. A metallic bond
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question 9 of 10 what kind of bond is present in nabr? a. hydrogen bond…
D. Ionic bond
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question 8 of 10 why do noble gases rarely form bonds with other atoms?…
C. The noble gases are already stable, with full octets of valence electrons.
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question 7 of 10 which of the following values best classifies a bond b…
C. An electronegativity difference of less than 1.7 between the atoms
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question 6 of 10 what is a triple bond? a. a covalent bond between 2 at…
B. A covalent bond between 2 atoms where each atom contributes 3 electrons
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question 5 of 10 which of the following diagrams is the correct electro…
B. $\boxed{:\stackrel{..}{Ne}:}$ (or as per the diagram in option B: the diagram with 8 dots around Ne, 2 on each side)
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question 4 of 10 which of the following examples is a molecule with a c…
A. CO
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question 3 of 10 what is an ionic bond? a. a bond formed from 2 atoms o…
B. A bond resulting from the transfer of 1 or more electrons
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question 2 of 10 which two atoms would typically form a covalent bond? …
D. Two atoms that are both nonmetals
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question 10 of 10 which of the following elements has the lowest first …
B. Strontium (Sr)
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question 9 of 10 what makes the atomic radius change down a column of t…
C. The larger the highest energy level number, the larger the atomic radius.
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question 8 of 10 the periodic trend for electronegativity is similar to…
D. The trend for first ionization energy
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question 5 of 10 what is a periodic trend? a. any characteristic of the…
B. A pattern that appears on the periodic table
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question 4 of 10 why do nonmetals tend to gain electrons to form negati…
D. They gain the few electrons they need to form full octets.
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question 3 of 10 which of the following elements is the least reactive …
B. Magnesium (Mg)
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question 2 of 10 which of the following elements is the smallest? a. be…
A. Beryllium (Be)
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question 1 of 10 what trend is seen in atom size, going down the period…
B. Atomic radius gets bigger the lower an atom appears on the periodic table.
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question 9 of 10 which of the following notations is the correct noble …
A. $[He]2s^1$
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question 8 of 10 what does the period number tell about the energy leve…
C. The period number tells which is the highest energy level occupied by the electrons.
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question 7 of 10 what is the correct electron configuration of phosphor…
C. \(1s^22s^22p^63s^23p^3\)
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question 6 of 10 what is the maximum number of electrons that can occup…
B. 2
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question 5 of 10 what property of an element does the group number iden…
B. The number of valence electrons
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question 4 of 10 when do d orbitals start getting filled? a. after the …
D. After the s orbital of the next highest energy level
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question 3 of 10 how many total orbitals are within the 3s, 3p, and 3d …
D. 9
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question 2 of 10 which of the following elements has 2 electrons in the…
B. Ca
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question 25 of 25 rubidium (rb) has an atomic number of 37. it can lose…
D. 1+
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question 24 of 25 which element is in the alkali metal family? a. lithi…
A. Lithium (Li)
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question 22 of 25 what are the alkali metals? a. elements with eight va…
D. The first group on the periodic table
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what did john dalton contribute to the understanding of the atom? a. an…
B. An early form of the atomic theory
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hands moving on a battery - operated clock is an example of what kind o…
D. Chemical potential energy being converted to kinetic energy
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question 17 of 25 which sentence describes all atoms of one element? a.…
D. They have the same number of protons.
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question 15 of 25 what determines an elements properties? a. the core e…
B. The valence electrons
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question 14 of 25 what did dmitri mendeleev contribute to science? a. h…
D. He arranged the first periodic table.
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question 12 of 25 what is the atomic number of arsenic (as)? a. 15 b. 3…
B. 33
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question 10 of 25 which element would be the least similar to magnesium…
A. Na
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question 9 of 25 thermal windows often have all the air pumped out betw…
C. Ar
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question 8 of 25 which family contains elements with a full octet of va…
C. The noble gases
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how were the elements in the first periodic table arranged? a. in order…
A. In order of atomic mass
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question 4 of 25 which option describes a phase change? a. air leaking …
B. Gasoline evaporating into the air
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question 3 of 25 an atom of copper (cu) has a mass number of 63 and an …
A. 29
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what is another name for group 14? a. group 14a b. group 4a c. group 4b…
B. Group 4A
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read this stanza from allen ginsbergs \a supermarket in california.\ wh…
The long-line structure imitates stream-of-conscious thought.
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read the descriptions of rhyme schemes below. free verse: poetry that d…
free verse
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medición de la acidez el ph de una solución es una medida de la cantida…
# Explicación: ## Paso 1: Aplicar fórmula de pH La fórmula del pH es $\text{pH} = -\log_{10} [\text{H}^+]$ ## Paso 2: Calcular pH del limpiador de hornos Sustituir $[\text{H}^+] =…
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the average volume was 24.94 ml and the range was 1.42 ml. the accepted…
1. accurate and precise
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fill in the blank 2 points balance the following equation: 3 sio₂ + 2 h…
The coefficient for HF should be 4, so the filled blank for HF is 4. The balanced equation (with the given partial coefficients adjusted) would be \( 3\text{SiO}_2 + 12\text{HF} i…
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fill in the blank 2 points balance the following equation: 1 al + 2 o₂ …
First blank (Al): 4 Second blank (O₂): 3 Third blank (Al₂O₃): 2 (But let's check the problem's blank positions. The first blank is before Al, second before O₂, third before Al₂O₃.…
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when placed into water, which formula represents phosphoric acid? hpo h…
D. \( \text{H}_3\text{PO}_4 \)