Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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hunting the elements 1. what do the two - letter words/symbols represen…
1. Chemical symbols for elements. 2. a) Au b) Protons, neutrons, electrons c) Dense, soft, yellow - colored, good conductor, corrosion - resistant. 3. Panning, sluicing, X - ray f…
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the lewis dot diagram for an unidentified element is shown below. which…
B. chlorine
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3.4.2 quiz: scientific models this mathematical model describes the cha…
B. The molecules will begin moving more slowly.
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question 6 of 10 based on the model you saw in the study, predict what …
A. The molecules will move more quickly.
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question 5 of 10 what does the model below represent? 2co + o₂ → 2co₂ a…
C. A chemical reaction
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the electron dot diagrams of calcium and magnesium are shown. both elem…
C. Both elements are in the same group on the periodic table.
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question 4 of 10 what does the object on the screen below model? a. the…
C. Molecules
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the element krypton is a gas that shows almost no chemical activity. to…
an element in the same group
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copper wires carry electricity into our homes because copper atoms lose…
A. Copper is used in electrical wiring instead of oxygen or sulfur because copper is a metal, loses electrons easily, is on the left - center of the periodic table, and allows ele…
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question 2 of 10 what kind of model is shown below? a. mathematical mod…
B. Physical model
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which element is most likely to form an ion with a negative 2 charge? o…
Oxygen
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pregunta 2. relacione los términos de la química con la mejor respuesta…
1. a. Enlace iónico 2. b. Enlace químico 3. c. Enlace covalente
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based on its position in the periodic table of the elements, how many v…
B. 5
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if an ion has three more electrons than protons, it has a ○ mass of +3.…
Charge of -3.
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the electrical charge of the nucleus of an atom is +12. how many electr…
B. 12
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activity 15 - bonding vs nonbonding while h - h is selected in the \com…
# Explicación paso a paso: ## Paso 1: Comprender los átomos de hidrógeno y helio El átomo de hidrógeno tiene 1 electrón en su orbital 1s. El átomo de helio tiene 2 electrones en s…
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what happens when an atom gains an electron? the atom loses a proton. t…
The atom becomes negatively charged.
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pregunta 2 ( relacione los fundamentos de la química con la mejor respu…
1. a. Enlace iónico 2. b. Enlace químico 3. c. Enlace covalente
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show instructions question 1 (0 points) explain what happens when amino…
- **Pregunta 1**: Los aminoácidos se enlazan a través de enlaces peptídicos, que son un tipo de enlace covalente. Este enlace se forma mediante una reacción de condensación entre …
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nonmetals form covalent bonds (shared electron pairs) with other atoms.…
B. the number of additional electrons the nonmetal needs to fill its valence shell
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¡proyecto de elemento en carte! objetivo: haz un póster sobre un elemen…
# Explicación: ## Paso 1: Identificar información básica del cobalto - Nombre: Cobalto - Símbolo atómico: Co - Número atómico: 27 (ya que es la identificación única del elemento e…
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complete the statement. in general, nonmetals in the same ______ form t…
B. group
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select the correct values in the table. type of covalent bond how many …
| Type of covalent bond | How many shared electron pairs in the bond? | How many electrons in the bond? | | ---- | ---- | ---- | | single bond | 1 | 2 | | double bond | 2 | 4 | | …
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complete the statement. covalent bonds form between ______. choose 1 an…
A. two nonmetals
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group 2 metals can bond with group 17 nonmetals to form ionic compounds…
2
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polyethylene is composed of long chains of carbon and hydrogen atoms bo…
C. covalent
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density polyethylene (hdpe) and low - density polyethylene (ldpe). recy…
van der Waals
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list two things you know about atoms. 1. 2.
1. Los átomos son partículas elementales. 2. Contienen protones, neutrones y electrones.
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you might need: calculator, periodic table hypobromite is a polyatomic …
43 protons 44 electrons
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the lewis diagram for a neutral strontium atom is shown below. sr compl…
lose; 2
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chemical substances were originally named based on their properties, di…
From left - to - right: $SrSO_{4}$, $K_{2}SO_{4}$, $CaSO_{4}$
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a student received a in english composition (3 credits), a c in chemist…
2.87
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fill in the table by selecting the correct iupac name for each formula.…
| Chemical formula | Name | | ---- | ---- | | RbCl | Rubidium chloride | | BeS | Beryllium sulfide | | Ba(C₂H₃O₂)₂ | Barium acetate | | CsClO₃ | Cesium chlorate |
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originally, chemical substances were named based on their origins or pr…
Quicklime: $CaO$ Limestone: $CaCO_{3}$ Fluorite: $CaF_{2}$
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this model represents an element in the periodic table. which element d…
C. Li, 6.94, Lithium
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sodium bicarbonate is commonly known as baking soda. its added to many …
A. $NaHCO_3$
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garnets are a class of minerals which exist in many colors. theyre ofte…
$Ca^{2 + }$ and $SiO_{4}^{4 - }$: Ionic $Al^{3 + }$ and $SiO_{4}^{4 - }$: Ionic $Si$ and $O$: Covalent
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based on this information, which two formulas below represent neutral c…
B. $Li_2SO_3$, C. $CaSO_3$
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hypochlorite is a polyatomic ion with formula clo⁻. it is used to disin…
25 26
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which formula accurately represents a neutral ionic compound? choose 1 …
A. MgO
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metals in group 1 of the periodic table can form ionic bonds with eleme…
B. group 17
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group 1 metals can bond with group 17 nonmetals to form ionic compounds…
1
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barium fluoride is an ionic compound. it produces light when x - rays o…
None of the given options are correct. The correct Lewis structure of barium fluoride should be $[Ba]^{2 + }2[ :F:]^-$ (but this is not among the provided choices). If we assume t…
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which of these elements forms ions with the same charge as radium ion? …
B. calcium
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group 2 elements are called alkaline earth metals. when exposed to air,…
lose; 2; + 2
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the lewis diagram for a neutral aluminum atom is shown below. ·āl compl…
lose 3
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a chemist is heating water so it can dissolve a larger amount of sodium…
$y = 7x+21$
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9. what is the schematic symbol shown below? a. laser b. triac c. photo…
D. photo - SCR
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thermal energy is applied to a gas. what will happen to the gas molecul…
A. The movement, kinetic energy, and pressure of the molecules will increase.
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chem a, unit 2 test 1. email * 2. which atom among cl, al, cs, and li h…
2. A. Cl 3. A. False 4. A. Arsenic
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multiple choice 2 points according to the rock cycle, ____ rocks form w…
31. A. sedimentary 32. B. the inner core, the outer core, the mantle, and the crust 33. D. wide continental shelf
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5. which of the following elements is an alkali metal? mark only one ov…
5. D. Na 6. A. Mg 7. A. Ar 8. D. F
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9. the region of space with the highest probability of finding an elect…
9. orbital 10. increases 11. have the same number of valence electrons 12. 1
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which drug contains the chemical thc and affects specific receptors in …
C. marijuana
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a model of a potassium bromide (kbr) lattice is shown below. a model of…
B. ionic (assuming there is an ionic option not shown in the provided part of the question as the correct answer is ionic and not covalent)
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barium sulfate (baso4) is composed of barium and sulfate (so42−) bonded…
Ionic
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aluminum (al) is lightweight and malleable. it is commonly used to make…
C. metallic
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groups 3 - 12 24. list the number of valence electrons for each of the …
Group 1: 1 Group 2: 2 Group 13: 3 Group 14: 4 Group 15: 5 Group 16: 6 Group 17: 7 Group 18: 8
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pete is composed of long chains of carbon, hydrogen, and oxygen atoms b…
B. covalent
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question 5 (1 point) which of the following descriptions correctly desc…
C. The process where sediment and other materials are moved from one place to another.
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9. arrange the following elements in order of increasing ionization ene…
a. Sr < Mg < Be b. Cs < Ba < Bi c. Na < Al < S
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two liquids are mixed. the mixture heats up, and a gas is produced whic…
There is evidence of a chemical change because new substances (the gas) are formed and there is an energy change (heating up).
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6. in point form, describe dalton’s atomic model. (2)
- Atoms are indivisible and indestructible. - Different elements have atoms of different masses. - Chemical reactions are rearrangements of atoms.
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element symbol atomic # mass # # of protons # of neutrons # of electron…
| Element | Symbol | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | Hydrogen | H | 1 | 1 | 1 | 0 | 1 | | …
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17. which element would have the largest atomic radius? mark only one o…
Rb 18.
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what building was the subject of boss tweeds biggest graft scheme? poli…
C. court house
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21. which element has a full valence shell and is therefore unlikely to…
B. Neon (Ne) ### 22.
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25. an aluminum ion (al³⁺) contains: mark only one oval. 13 protons, 13…
25. 13 protons, 10 electrons, 14 neutrons 27. Fission 28. Sodium has one valence electron it can easily lose 26. Atoms with the same number of protons but different numbers of neu…
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31. which statement best describes why isotopes of carbon (c - 12 and c…
- **Question 29**: C. Fluorine (F) - **Question 30**: B. Rutherford: The gold foil experiment - **Question 31**: D. They have different numbers of neutrons - **Question 32**: D. T…
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion.
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which evidence is an indication that a chemical reaction has occurred? …
Formation of a precipitate
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use the periodic table to answer the question. how many valence electro…
seven
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why do atoms exchange or share electrons during bonding? (1 point) to a…
to obtain a full outer electron shell
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patterns of properties quick check what are valence electrons? (1 point…
the electrons in an atom's outermost energy level
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7. which answer best support your answer to part a? a. “one of the main…
7. B. "The chemicals that are released during fight - or - flight can work like glue to build strong memories ('flashbulb memories') of scary experiences...you'll never forget" (4…
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patterns of properties quick check which feature defines a neutral atom…
the number of electrons equal to the number of protons
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ethan heard that a person who is having a heart attack should chew an a…
- Does a sugar cube dissolve faster in water if the water is stirred with a spoon? - Does crushing a sugar cube make it dissolve faster in tap water?
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devin is preparing a glass of salt water for a mouthwash. as the salt d…
Does dissolving salt in water lower the water's temperature more than dissolving sugar in water does? Does dissolving a larger amount of salt in water lower the water's temperatur…
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ben is mixing kitchen ingredients with his little brother. when ben add…
Does baking soda cause a bigger temperature change when mixed into a bowl of vinegar or into a bowl of water? Does baking soda bubble more when mixed into tap water or into carbon…
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tara is making rock candy. she wonders what factors affect how large th…
All of the above questions can be investigated.
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1. the addicting substance when you smoke or vape is called: a) carbon …
1. c) Nicotine 2. b) Heart 3. c) Cancer 4. a) Tar 5. b) Oxygen 6. c) Aerosol 7. a) Diacetyl
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4. the sticky substance caused by cigarette smoke that makes a) tar b) …
5. b) Oxygen 6. c) Aerosol
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jon is using a wet rag to wipe down the countertops in his kitchen. he …
Does tap water heated on a hot plate dissolve sugar faster than tap water chilled in a refrigerator does? Does tap water dissolve sugar faster when it is stirred with a spoon?
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which electrons participate in chemical bonding? the innermost electron…
valence electrons
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what can affect the properties of a substance? neither the arrangement …
the arrangement and types of atoms
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atomic theory timeline questions and rubric please choose the correct a…
1. b) Thomson 2. a) nucleus 3. a) Dalton 4. d) Bohr 5. c) indivisible 6. a) Aristotle 7. d) most of the atom is empty 8. c) Rutherford
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how do an ionic bond and a covalent bond differ? a covalent bond is an …
An ionic bond is an attraction between oppositely charged ions. A covalent bond is a sharing of electrons between atoms.
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what is the definition of a covalent bond? o a bond between two atoms o…
a bond between two atoms
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an ionic bond occurs between what particles? two negative ions two neut…
a positive and negative ion
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the list shows characteristics of an unknown substance. - the substance…
(There is no option text provided for the other options, but if we assume the correct diagram is one with all the same type of particles, we would choose the diagram that meets th…
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the passage below describes an experiment. in science class, jerry lear…
an independent variable
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the passage below describes an experiment. in chemistry class, cooper l…
a dependent variable
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the passage below describes an experiment. leo works at a candy store a…
an independent variable
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while watching tv, zack saw an advertisement for a water softener. the …
a dependent variable
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a paper clip floating on water. as tom used detergent to wash olive oil…
independent variable: the number of drops of detergent added to the water dependent variable: the number of paper clips that floated
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where does the energy come from to excite the electrons to a higher ene…
First question: its in the chemical bonds Second question: No, the colors are characteristic of the substance's elements
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where are the labs fire extinguishers? in the cabinet in the back of th…
C. Near the chemical storage room.
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when do you need to wear safety goggles? (circle all that apply.) when …
When the teacher instructs me to do so. When handling objects that may break, expand, or endanger my eyes in someway. When heat or chemicals are used.
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scientists used to believe that chemical reactions fueled the sun. why …
Scientists once thought chemical reactions fueled the young sun. We now think nuclear fusion reactions in the sun's core are responsible for the energy it releases because chemica…
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using the information from this experiment, scientists determined that …
Text Chunk 3: Experiments led to the revision of Thomson's atomic model, discovery of protons and neutrons, and understanding of atomic structure with a nucleus and electrons in e…