Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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10 chemical weathering breaks down rock by causing chemical changes tha…
True
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10 chemical weathering breaks down rock by causing chemical changes tha…
True
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the diagrams above use arrows to represent the speed of a gas particle.…
10. D 11. D
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read the rough - draft paragraph. (1) many people experience a sense of…
3
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8. at 10.°c, 20.g of oxygen gas exerts a pressure of 2.1atm in a rigid,…
B. 2.3 atm, because the pressure P increases by the proportion $\frac{313}{283}$ ### 9.
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question 3 2 pts antibodies are edema - causing large peptide molecules…
giant protein molecules
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question 2 2 pts amino means containing ______. oxygen nitrogen carbon …
B. nitrogen
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which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
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6. the structures of two allotropes of carbon are represented above. wh…
C. Carbon atoms in diamond have four covalent bonds, whereas graphite is made of layers that are held together by relatively weak dispersion forces. ### 7.
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the atomic models after daltons time included ideas about the atomic st…
Schrödinger's model
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4. the diagrams to the left represent two allotropes of solid phosphoru…
B. Allotrope II, because it has covalent bonds between the phosphorous atoms that are stronger than the dispersion forces between the $P_4$ molecules in allotrope I. ### 5.
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the plum pudding model of the atom states that each atom has an overall…
an atom is made up of electrons in a sea of positive charges.
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match each attractive force with the name or description column a 1. c …
4. c 5. f 6. c 7. c 8. f
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you may use the tables of slide #18 of module 4.1 to answer the followi…
(1) 4 (2) 1 (3) 4
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question 18 of 20 what nacl concentration results when 304 ml of a 0.60…
$0.394$
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question 8 sodium chloride (nacl) has a density of 2.17 g/cm³. the atom…
(a) $0.565$ nm (b) $0.566$ nm
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aqueous hydrochloric acid (hcl) reacts with solid sodium hydroxide (nao…
$36.0\%$
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each week capechem, a manufacturer of fine chemicals, uses up 350 kg of…
The maximum theoretical mass of Compound C: 1300 kg The average amount of Compound C actually shipped: 754 kg
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gaseous methane (ch₄) will react with gaseous oxygen (o₂) to produce ga…
8.4 g
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question 6 2 pts on the basis of ionic charge and ionic radii, predict …
(1) 0.627 (2) Face - centered cubic (rock - salt type)
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gaseous ammonia chemically reacts with oxygen (o₂) gas to produce nitro…
$0.11\ mol$
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the drawing below shows a mixture of molecules: key carbon hydrogen nit…
Of which reactant are there the most initial moles? Enter its chemical formula: $O_2$ Of which reactant are there the least initial moles? Enter its chemical formula: $CS_2$ Which…
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if a chemical reaction does happen, write a balanced chemical equation …
$4HCl(g) ightarrow 2H_2(g)+2Cl_2(g)$
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gaseous water and solid potassium oxide are formed by the decomposition…
$2KOH(s) ightarrow H_2O(g)+K_2O(s)$
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question 11 - 1 point what types of molecules will display hydrogen bon…
Polar molecules containing a hydrogen directly bonded to an electronegative atom (nitrogen, oxygen, fluorine)
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in the polar molecule hbr, what charge does the h bear? select the corr…
A. Partial positive
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an ax ceramic compound has the rock salt crystal structure. if the radi…
$1.75\ g/cm^{3}$
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question 9 · 1 point which state of matter has the weakest intermolecul…
A. Gas
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question 8 - 1 point which pair of elements will form an ionic compound…
D. Na and F
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which bond is least polar? select the correct answer below: o na - cl o…
P - Cl
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which is the correct lewis symbol for a nitrogen atom? select the corre…
O $\cdot\ddot{N}\cdot$
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what is the name of the compound with the chemical formula xeo₃? select…
D. xenon trioxide
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question 4 - 1 point which is a difference between molecular compounds …
Molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges.
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what is the chemical formula for the ionic compound barium iodide? sele…
D. $BaI_{2}$
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question 2 - 1 point which anion would bond with k+ in a 1 : 1 ratio to…
B. $F^-$
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question 1 · 1 point what is the name for a positively charged ion? sel…
A. Cation
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molecules with hydrogen bonds (ch(_3))(_3)n c(_2)h(_5)oh ch(_3)nh(_2) h…
$C_2H_5OH$, $CH_3NH_2$, $CH_3COOH$, $HF$
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question examine the list of compounds and drag the formulas into the a…
| Ionic bonds | Covalent bonds | Both ionic and covalent bonds | | --- | --- | --- | | Na₃N, LiI | NH₃, CCl₄ | NH₄NO₃, Li₂CO₃ |
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compound x has a molar mass of 416.41 g·mol⁻¹ and the following composi…
\(P_2Cl_{10}\)
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intermolecular forces are primarily responsible for: select the correct…
B. holding together molecules in a material
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question examine the following substances and determine which box each …
- solid iodine: Both intermolecular and intramolecular - argon gas: Intermolecular only - liquid mercury: Intermolecular only - solid sodium chloride: Both intermolecular and intr…
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measurements show that unknown compound x has the following composition…
$Ca_3P_2O_8$
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question which of the following would have the lowest imf? select the c…
A. gas
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question polar molecules have attractive dipole - dipole interactions w…
head - to - tail: →→, side - to - side, antiparallel: ↑↓
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this is the chemical formula for methyl tert - butyl ether (the clean -…
23.0 mol
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question hydrogen bonds are formed between hydrogen and: select the cor…
C. electronegative atoms
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hydrogen bonding is responsible for: select the correct answer below: t…
the unexpectedly high boiling points for hydrides in period two
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question examine the following substances and determine which box each …
| Substance | Intermolecular only | Intramolecular only | Neither intermolecular nor intramolecular | Both intermolecular and intramolecular | |--|--|--|--|--| | liquid oxygen | X…
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question what types of particles can participate in dipole - dipole int…
polar molecules
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question in general, the type and magnitude of intermolecular forces th…
A. physical properties
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which of the following will have a higher boiling point? select the cor…
A. $CHBr_3$
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the oxidation number of an atom in an elemental substance is ____. the …
D. zero; equals
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the chemical equation, h₂o --> h₂ + o₂ is ____. we can add coefficients…
A. unbalanced; 2; 2; 1
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question in order for a molecule to be polar, it must have: select the …
D. all of the above
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which molecule will have a net dipole? select the correct answer below:…
H₂S
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which molecule will have a net dipole? select the correct answer below:…
SO₂
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the image below represents a molecule that takes up a three - dimension…
The dipole moment is 0
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question noble gases do not receive electronegativity values because: s…
C. they have a full valence shell
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use the figure provided to determine which of the following describes m…
B. ionic
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question identify the compound with ionic bonds. select the correct ans…
AlBr₃
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question identify the compound containing polar covalent bonds. select …
B. $\mathrm{CCl}_{4}$
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use the figure provided to determine which of the following describes n…
C. polar covalent
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use the figure provided to determine which of the following has bonds w…
H₂O
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5. step and compare models: towards the bottom, in the middle of the sc…
i. In Rutherford's model, electrons are randomly placed; in Bohr's, they are in fixed orbits. ii. In Bohr's model, electrons have defined positions; in Heisenberg's, they are in a…
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question two atoms of the same element are most likely to form ________…
a non - polar covalent bond
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question which pair of elements will not form an ionic compound? select…
C. C and Br
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what is the lewis symbol for be^{2+}? select the correct answer below: …
O $\text{Be}^{2 +}$
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what is the lewis symbol for k+? select the correct answer below: o k+ …
K⁺
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what is the lewis symbol for k+?
$[\text{Ar}]$
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a lewis symbol that has a non - noble gas element and no dots represent…
A. cation
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question electrons on a lewis symbol will be arranged: select the corre…
C. one on every side before placing a second on any side
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1. there are two stable isotopes of chlorine, $^{35}cl$ (34.9688 u) and…
a) 17 b) 20 c) 4
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question covalent bonds are most commonly formed between: select the co…
nonmetals
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calculate the mass of tetraborane (b₄h₁₀) that contains a trillion (1.0…
$8.85\times 10^{-12}\text{ g}$
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question what results when two or more atoms share electrons equally? s…
molecular compounds
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calculate the number of vanadium atoms in a 140.0 g sample of vanadium(…
\(9.270\times 10^{23}\) atoms
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which of the following does not correctly pair the polyatomic ion with …
A. cyanide, $CN^{+}$
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the chemical formula for potassium bromide is kbr. a chemist determined…
8.33 g
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mgso₃ is called __________. select the correct answer below: o magnesiu…
D. magnesium sulfite
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a chemist measures the amount of iodine solid produced during an experi…
$0.261\ mol$
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a chemist determined by measurements that 0.0550 moles of silver partic…
$5.93\ g$
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which of the following correctly pair the polyatomic ion with its formu…
- A. cyanide, $CN^-$ - B. chlorate, $ClO_3^-$ - D. nitrate, $NO_3^-$
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ammonium hydroxide has the formula ______. select the correct answer be…
NH₄OH
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5. write the number of outer most electrons for each element. na____ mg…
Na: 1, Mg: 2, Al: 3, Si: 4, P: 5, S: 6, Cl: 7, Ar: 8
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methanol is in liquid form if its temperature is between - 94°c and. at…
-43°C, 0°C, 25°C
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question 24 (1 point) cobalt is element 27. cobalt - 60 is used in the …
B. 33 neutrons, 27 protons
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6. how many energy levels do each of the group 1 element have on their …
a. 1 b. 2 c. 3
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question 23 (1 point) isotopes have the: a) same number of protons but …
A. same number of protons but different number of neutrons
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question 22 (1 point) what is the electron arrangement for the first el…
(1)
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4. elements with a complete outer shell are located _____________. a. e…
a. 1 b. alkali metals
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which is not a chemical symbol? na cs n cs
D. CS
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which element is a transition metal? calcium oxygen iron iodine
C. Iron
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3. which elements had only one electron in their outer most shell? a. _…
a. Hydrogen (H) b. Lithium (Li) c. Sodium (Na)
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question 18 (1 point) which is true about subatomic particles? protons,…
Subatomic particles are smaller than atoms.
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2. what do you notice about the location of the elements in question #1…
a. 18 b. 18 c. Noble
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1. which elements had complete outer shells? either two or eight electr…
a. Helium (He) b. Neon (Ne) c. Argon (Ar)
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question 12 (1 point) which is not a physical change of water? liquid w…
Liquid water decomposes to hydrogen gas and oxygen gas.
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which element has the following ground state electron configuration? 1s…
A. Cl
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5. consider the following reaction: (ℓ) + 4.5 o₂ (g) → + 2 co₂ (g) + 2 …
a) \(44.1\%\) b) \(1.27\) c) \(93.75\%\) d) The reaction is not very green due to low atom - efficiency (\(44.1\%\)) and a non - negligible E - factor (\(1.27\)).
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question 10 (1 point) what is the atomic mass of an element? the mass n…
The weighted average atomic mass of all isotopes of an element