Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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an element ... (select all that apply) contains different atoms. can be…
- is a substance. - cannot be broken down.
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select the correct answer from each drop - down menu. to prepare a 2 m …
The mass of the solute and the volume of the solution must be measured. So the first - drop down menu: solute; the second - drop down menu: solution.
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common polyatomic ions chemical name chemical formula chemical name che…
C. 151 g
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choose all the statements that are true for mixtures. (select all that …
- Mixtures can contain pure substances. - Homogeneous mixtures are also called solutions. - There are 2 types of mixtures. - Mixtures can be formed from 2 gases together. - Two el…
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13 of 16 04:42 / 40:00 __________ can be broken down into simpler subst…
D. compuestos
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the type of mixture that has a constant composition throughout is a ___…
homogeneous mixture
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which of the following are pure substances? select all that apply water…
- Water - Oxygen
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synthetic materials o have only negative effects on the environment o a…
have no similarity to materials in nature
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choose the statements that are true for \substances\. (select all that …
- Substances have an unchanging composition - An element is a substance.
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the _____________ organizes the elements into periods and groups. ○ per…
periodic table
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elements in the same group have similar physical and chemical propertie…
True
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1. it is a branch of mathematics that uses letters, symbols, and number…
1. A. Algebra 2. B. Algebraic Expression
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select the correct answer from each drop - down menu. describe the char…
The bond polarities are polar, the molecular shape is trigonal - pyramidal, and the molecule is polar.
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the law that states that two compounds can be formed by the same elemen…
# Breve Explicación: La ley de múltiples proporciones establece que cuando dos elementos se combinan para formar más de un compuesto, las masas de uno de los elementos que se comb…
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a ____________ is made up of two or more different elements that are co…
compound
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select the correct answer. which pair of elements can form ionic bonds?…
E. potassium (K) and bromine (Br)
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a ____________ is a combination of two or more pure substances in which…
A. mixture
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darius buys a bottle of a chemical solution that contains 70% alcohol. …
350
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h₂o (water is a(n) ... ○ compound that contains 2 atoms of hydrogen and…
compound that contains 2 atoms of hydrogen and one atom of oxygen.
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type the correct answer in the box. a pharmacist works with a 1.75 m so…
147
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sodium chloride (nacl) contains... one atom of sodium and three atoms o…
1 átomo de sodio y 1 átomo de cloro
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type the correct answer in the box. express your answer to two signific…
14
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a period is a vertical column in the periodic table. true false
False
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select the correct answer. megan prepares a pitcher of lemonade by addi…
C. Stir the water continuously
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select the correct answer. a solution has a ph of 4.20. using the relat…
E. 1.6×10⁻¹⁰ M
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drag each tile to the correct box. match the name of each compound to i…
$H_2SO_3$ → sulfurous acid $NH_3$ → ammonia $HNO_3$ → nitric acid $H_2SO_4$ → sulfuric acid $HClO$ → hypochlorous acid
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explain the common characteristics that all synthetic materials share. …
Synthetic materials are sourced from petrochemicals or other chemical precursors. The production process is typically polymerization. Common characteristics are durability, resist…
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match the vocab with their definitions. a measurement that refers to th…
synthetic material: A material obtained from a natural material that has undergone a chemical reaction. composite: Something made of several materials. mass: A measurement that re…
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which statement best explains why a metal atom and a nonmetal atom are …
Metal atoms have low ionization energy, and nonmetal atoms have high electronegativity, so electrons transfer easily from the metal atom to the nonmetal atom.
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which statement describes the valence electrons in ionic bonds? they ar…
They are transferred from one atom to another.
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which of these is a property of a substance that is composed of atoms t…
It can be flattened and bent.
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what will most likely happen when two bromine atoms bond together? the …
A covalent bond will hold them together.
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which statement explains why the bonds between nonmetals tend to be cov…
C. They have small differences in electronegativity.
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when heated, calcium carbonate goes through a chemical reaction, and pr…
A. Carbon dioxide is produced, and as a gas, it was not captured to measure.
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consider the positions of carbon, nitrogen, potassium, and calcium on t…
C. nitrogen (N)
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in a chemical reaction, atoms are rearranged to form new molecules. how…
A. It will stay the same no matter how the atoms are rearranged.
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sugar is made up of clear, colorless crystals that dissolve easily in w…
It is made up of atoms that are held together by covalent bonds.
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in atomic theory, new substances are formed when the atoms of other sub…
C. The amount of matter is conserved.
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how is electronegativity related to covalent bonding? atoms must have s…
Atoms must have similar electronegativities in order to share electrons in a covalent bond.
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robin and alex are discussing how water molecules form when hydrogen an…
B. The number of oxygen atoms is the same before and after the reaction.
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q.15.how many moles of mg are there in 2.75g of mg? (7 p show your work…
$0.113\ mol$
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which pair of elements would form an ionic bond? carbon (c) and oxygen …
B. strontium (Sr) and chlorine (Cl)
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conservation of mass berny has a 0.15 - kilogram candle, a 1.00 - kilog…
B. 1.40 kilograms
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which pair of elements would form an ionic bond? carbon (c) and oxygen …
strontium (Sr) and chlorine (Cl)
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which of the following best helps to explain why hexane has a higher bo…
D. Hexane molecules have electron clouds that are larger than those of methanol molecules.
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conservation of mass the chemical reaction shown above takes place in a…
The total mass of the system remains constant.
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which of the following lewis diagrams represents the substance that wou…
C. H - C - C - C - N - H (with hydrogens attached to carbons and lone - pairs on nitrogen)
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o2, h2o, c3h8, cf4. of the substances listed above, which has the highe…
B. $H_2O$, because hydrogen bonds form between its molecules.
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08:19 hide compound 1 compound 2 the structural formulas of two compoun…
D. Although there are dipole - dipole attractions among molecules of both compound 1 and compound 2, the -OH group in compound 2 allows strong hydrogen bonding.
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the london (dispersion) forces are weakest for which of the following g…
A. $H_2$
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in the chemical reaction below, sodium metal and chlorine gas combine t…
B. will be exactly 50 grams.
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name: teacher: schools q1 chemistry: u2l7 avg. atomic mass & mass spec …
1. An unstable form of an element emitting radiation during decay to a stable state. 2. Due to unstable nuclei from proton - neutron imbalance. 3. Alpha - decay, beta - decay, gam…
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which interaction is responsible for the force of attraction between th…
proton - electron
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directions: select all the correct answers. which of the following equa…
Cu + H₂O → CuO + H₂, 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O, 2Ag₂O → 4Ag + O₂
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look at the equation below. o2 + cs2 → co2 + so2 which of the following…
D. $3O_2 + CS_2 ightarrow CO_2+2SO_2$
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question 10 of 25 the technology in the picture produces which energy c…
B. Kinetic energy to electrical energy
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question 9 of 25 what type of energy is sound energy? a. kinetic energy…
A. Kinetic energy
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2. the batteries most used in electric cars these days are this type: 3…
2. Lithium - ion batteries 3. Lithium - polymer (Li - Po) batteries (common choice) 4. Lead - acid batteries 5. Chemical energy 6. Thermal runaway
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part b - fill in the blank use word bank to complete each sentence. wor…
11. natural resource 12. climate 13. reservoirs 14. recycle 15. access 16. factor 17. drought 18. region 19. contaminate 20. water cycle
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1. what sizes of alkaline battery can you typically buy at the store? (…
1. AA 2. Lithium - ion 3. Nickel - metal hydride (NiMH) 4. Lead - acid 5. Chemical energy 6. Thermal runaway
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part c: true (t) or false (f) 1. changing the size and shapes of pieces…
1. T 2. F 3. T 4. F 5. F 6. T 7. T 8. T 9. F
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question 10 (1 point) which of the following is the strongest (most rea…
$-\text{CH}_3^-$ (the first option)
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you have a graduated cylinder that you use to measure volume. the cylin…
B. 35.5 ml
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physical or chemical property? iron is magnetic.
Física
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4. which is the most reactive metal in the periodic table? explain. wou…
The most reactive metal is francium. It would not be found in its unreacted elemental form because of its high reactivity.
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the law of conservation of mass states that the mass of the reactants w…
B. equal to
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20 grams of n2 was reacted with 24 g h2 to make nh6. how many grams of …
# Explicación: ## Paso 1: Calcular las masas molares La masa molar de $N_2$ es $M_{N_2}=2\times14 = 28\ g/mol$, la masa molar de $H_2$ es $M_{H_2}=2\times1 = 2\ g/mol$ y la masa m…
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3. arrange the following metals in order from least reactive to most re…
1. Ag 2. Mo 3. Na 4. Rb 5. Cs 6. Fr
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13. which element has the noble gas configuration of ar4s²3d⁶? nickel m…
Iron
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what is the volume? 25.70 ml 29 ml 25.7 ml 25.75 ml
# Explicación: ## Paso 1: Identificar la graduación más cercana Observamos que el nivel del líquido está entre 25 y 26 mL. La graduación del instrumento parece tener intervalos de…
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what is the name of the following white object? 1 point graduated cylin…
# Breve explicación: Los frascos de laboratorio se usan para almacenar y manipular sustancias químicas. Un crisol es un recipiente de forma cilíndrica, generalmente de cerámica o …
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what is the calibration on the following? (also called the minor scale)…
D. 1 mL
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12. which element has the electron configuration of 1s22s22p63s23p5? ch…
Chlorine
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indicate the hybridization of the atoms labeled a, b, c, and d (in that…
$sp^{2}, sp^{2}, sp, sp^{3}$
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which of the following is a chemical property? 1 point the ability to r…
A. the ability to react with oxygen in the air
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11. given the electron configuration of 1s²2s²2p⁴, how many electrons d…
6
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salt dissolves in water... is this a chemical or physical change? chemi…
B. Physical
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14. which of the following noble gas configurations represents the elem…
$[\text{Ar}]4s^{2}3d^{10}4p^{5}$
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1. aluminum (al) has an atomic number of 13 and is located in group 13 …
In general, there is a relationship between the locations of metals on the periodic table and their relative activity. Metals towards the bottom - left of the periodic table are m…
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in a ______ change, bonds between atoms are broken. 1 point chemical ph…
A. chemical
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it is ok to return unused chemicals to their original containers. 1 poi…
B. False
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if you start with 5 grams of the blue chemical and make 11 grams of the…
B. 6 g
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question 8 (1 point) what is the iupac name for the following molecule?…
C. 2,2,6 - trimethyloctane
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clear all atoms prefer to have eight electrons in the valence shell. hi…
Electrons should fill atomic orbitals of the lowest available energy levels before occupying higher levels.
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a safety shower is used when 1 point you forget to take a shower that m…
B. Chemicals get in your eyes
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question 5 (1 point) all of the chairs below correspond to cis - 1,4 - …
The structure where the two methyl groups are in a trans - relationship (one above and one below the ring) is the one that does not correspond to cis - 1,4 - dimethylcyclohexane. …
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question 1. which of the following properties of water can be used to e…
cohesive ability
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question 6 (1 point) how many hydrogens does the molecule carvone have?…
14
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which of the following best describes how these nonrenewable resources …
Combustion of the fuels can lead to high carbon emissions, causing a disruption to the carbon cycle.
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question 4 (1 point) which is the least stable conformation of 3 - meth…
The conformation where the methyl group and the hydroxyl group are in the gauche position (causing steric strain) is the least stable. Without specific labels for the options, it'…
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what are the substances that come before an arrow in a chemical equatio…
# Breve explicación: En una ecuación química, las sustancias que se encuentran antes de la flecha son aquellas que entran en reacción. Estas se denominan reactivos. # Respuesta: B…
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ice is melting...is this a chemical or physical change? 1 point physica…
# Breve explicación: Un cambio físico es aquel en el que la sustancia mantiene su identidad química, solo cambia su estado físico. Cuando el hielo se derrite, el agua pasa de esta…
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question 3 (1 point) identify the following three pairs of structures i…
I = stereoisomers, II = structural isomers, III = the same
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which of these molecules is not a resonance form of a b c d
D. Option D
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physical or chemical property? copper conducts electricity. physical ch…
Physical
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question 1 (1 point) determine the position of equilibrium of the follo…
reactants
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5) explain why two non - metallic elements are not likely form ionic bo…
Two non - metallic elements are not likely to form ionic bonds because non - metals have similar electronegativities and prefer to share electrons rather than transfer them as req…
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physical or chemical change?...iron reacts with oxygen to create iron o…
B. Chemical change
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which of the following is a physical property? 1 point copper reacts wi…
Aluminum is ductile and can easily be bent into a wire.
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read the following quote from a 1914 government report: \while the fact…
First question: The future of fishing may be in jeopardy if it continues unregulated Second question: Cities create their own microclimates and produce large amounts of solid wast…