Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which of the following is an oxidation half - reaction? o fe3+ + e- ---…
Question 1: Sn2+ ----> Sn4+ + 2e- Question 2: 2H+ + 2e- ----> H2
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question 26 1 pts which of the following is an oxidation half - reactio…
Question 26: Please provide the options clearly as they are not legible. Question 27: Please provide the options clearly as they are not legible.
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reconstructing a landscape. which statements about this area are true b…
- The area was once a forest. - The area was uplifted. - The area was probably covered by water.
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question 26 which of the following is an oxidation half - reaction? fe3…
$\ce{Sn^2+ ightarrow Sn^4+ + 2e-}$
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which statement is true of a chemical reaction? o energy is always rele…
Energy is either released or absorbed.
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which property is a chemical property of a substance? o melting point o…
reactivity
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the atomic mass of an element takes into account the mass of each isoto…
how often each isotope occurs in nature.
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all atoms of the same element have the same... mass. number of electron…
number of protons.
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which of the following atoms has the fewest neutrons? they all have an …
B. Nitrogen - 14 has the fewest neutrons.
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what is the atomic mass of an element? the mass of an element using amu…
C. All of these
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read the paragraph, then choose the word that best completes the senten…
B. specialized
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fill in the element in each list with the largest electronegativity: k,…
Li Cl F N
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for each list, place elements in order of least to greatest atomic mass…
1) N, As, Bi 2) Ne, Ar, Rn 3) Ca, Fe, Pb
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using the information in the graphic, how many protons does an atom of …
13
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fill in the element in each list with the largest ionization energy: te…
Se Te F Cl
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type the element in each list with the largest atomic mass: n, li, be →…
N At Te Cl
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using the information in the graphic, how many neutrons are there in th…
14
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drag and drop the correct answer to the correct spot. the atomic mass o…
DOWN, RIGHT
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an element has three naturally occurring isotopes. the isotope with a m…
A. 87.9 amu
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9 multiple choice 1 point silicon is a metalloid metal transition metal…
9. A. metalloid 10. True
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7 multiple choice 1 point what element is a halogen? neon iodine oxygen…
7. B. Iodine 8. C. non - metal
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6 multiple choice 1 point which element is not a trasition metal? calci…
A. calcium
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identify the number of valence electrons found in each element. answer …
Al: 3 C: 4 Ne: 8 K: 1 S: 6 Br: 7 P: 5 Ca: 2
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5 multiple choice 1 point metal are found on the ____________ the perio…
C. left side of
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4 multiple choice 1 point when an atom gains an electron (charge turns …
B. anion
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nitrogen boron 5 3 identify the element and number of valance electrons…
First atom: Element Name: Nitrogen, Valence Electrons: 5 Second atom: Element Name: Boron, Valence Electrons: 3
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using the information in the graphic, how many electrons does a neutral…
B. 13
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is the number of protons plus the number of neutrons averaged. atomic c…
Atomic Mass
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2 multiple choice 1 point atoms that have different number of neutrons …
C. isotope
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using the information in the graphic, what can you assume is the mass o…
C. 27
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the lightest transition metal --> the heaviest alkali metal --> the thi…
The lightest Transition Metal --> Sc The heaviest Alkali Metal --> Fr The third Halogen element --> Br The fourth Noble Gas element --> Kr
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1 multiple choice 1 point an atom that has a charge is called a(n) ion …
A. ion
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types of reactions quick check in the decomposition of water, why is tw…
There are two atoms of hydrogen and one atom of oxygen in a water molecule.
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identify the correct elements being described below: the alkaline earth…
1. Ra 2. Cu 3. He
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types of reactions quick check which statement correctly describes the …
Not all reactions fit into one category, and some reactions can fit into more than one category
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question 2 chemical equations ____. describe only biological changes de…
Question 2: describe chemical reactions Question 3: Heat is supplied to the reaction.
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9. what is true about elements as you move from left to right across a …
9. D. Their ionization energy generally increases 10. C. Group 17
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why is thermal pollution a problem? not chemicals are dumped into ocean…
Hot water from power plants is dumped in lakes which decreases oxygen in the water and kills fish.
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identify the correct elements being described below: the only group 1 e…
1. H. Hydrogen 2. Li. Lithium 3. Cl. Chlorine
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7. which of the following elements is a metalloid? a. boron b. oxygen c…
7. A. Boron 8. C. Alkali metals
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the most widespread source of water contamination in developing countri…
A. raw sewage
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1. al + o₂ → al₂o₃ what elements are in the reactants? put the number o…
1. Reactants elements: Al: 1, O: 2; Reactants compounds: O₂; Products elements: Al: 2, O: 3; Products compounds: Al₂O₃; Unbalanced 2. Reactants elements: Hg: 1, O: 1; Reactants co…
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5. the atomic number of an element is equal to: a. the number of proton…
5. A. The number of protons 6. D. Metals
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sort the groups into their correct location on the periodic table: answ…
From left - right (top - down for groups): Alkali Metals in Group 1 Alkaline Earth Metals in Group 2 Transition Metals in Groups 3 - 12 Halogens in Group 17 Noble Gases in Group 18
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which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
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sort the terms in the answer key into the correct category below. metal…
Metals: Hard and shiny, Good conductors of heat and electricity, Some are magnetic, Malleable and ductile Nonmetals: Soft and brittle, Some are gases at room temperature, Lower de…
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classify each element below as a metal, nonmetal, or metalloid.
Na: Metal Br: Nonmetal Au: Metal Si: Metalloid N: Nonmetal Ge: Metalloid
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part a: multiple choice 1. who is credited with creating the first wide…
1. C. Dmitri Mendeleev 2. B. Period 3. C. Similar chemical properties 4. B. Neon
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types of elements the periodic table contains three types of elements: …
From top to bottom: Metals, Metals, Nonmetals
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which of the following is less likely to result in edema? multiple choi…
A. Increased mean arterial pressure
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the students researched the composition of the shoe materials and disco…
Copper is a transition metal known for its excellent conductivity of electricity and heat.
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fill in the blanks cl --> group period ba --> group period ag --> group…
Cl --> Group 17, Period 3 Ba --> Group 2, Period 6 Ag --> Group 11, Period 5
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1. match the statements with the pictures. answers can be used more tha…
- atomic model proposed by Dalton: A - atomic model proposed by Rutherford: E - atomic model proposed by Bohr: D - atomic model based off of discoveries by Heisenberg and Schrödin…
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the science of fear resource assessment vocabulary matching: match the …
Vocabulary Matching: 1. A. ADRENALINE 2. E. CENTRAL NERVOUS 3. B. AMYGDALA 4. D. CARDIOVASCULAR 5. H. IMMUNE 6. A. ADRENALINE 7. B. AMYGDALA 8. C. ANXIETY 9. I. PHYSIOLOGICAL 10. …
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type the group and period where each element is found: cl chlorine → gr…
Cl: Group 17, Period 3 Ba: Group 2, Period 6 Ag: Group 11, Period 5
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drag and drop the symbol of the element found at each location below. t…
Group 16, Period 5: Te Group 2, Period 4: Ca Group 17, Period 2: F Group 8, Period 4: Fe
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identify the correct element based at each location below. group 16, pe…
Top - Te, Middle - Mg, Bottom - F
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12. for each of the following elements write a. the electron configurat…
a) Sulfur: - Electron - configuration: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}$ - Orbital diagram: $1s$: $\uparrow\downarrow$, $2s$: $\uparrow\downarrow$, $2p$: $\uparrow\downarrow$ $\upa…
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the periodic table contains periods and groups.
7 periods and 18 groups
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part b using the information provided to the left, match the stage of t…
# Explicación: ## Paso 1: En el lanzamiento La energía química almacenada en el combustible del cohete es la principal forma de energía. Esta energía química se desprende durante …
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12. match the correct places on the model with the parts of an atom. ch…
Top box: proton Middle box: neutron Bottom box: electron
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which of the following atoms would have the largest atomic radius? lith…
Cesium
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3. which statement best describes the name and location on the periodic…
Fluorine, on the upper right, has the highest electronegativity, and Francium, on the lower left, has the lowest electronegativity
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10. fill in the blanks: (1 pt each) symbol atomic # mass # # protons # …
| Symbol | Atomic # | Mass # | # protons | # electrons | # neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | | $Zn^{+2}$ | 30 | 65 | 30 | 28 | 35 | | $Ir$ | 77 | 192 | 77 | 7…
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10. the concentration of oxalate ion ($c_2o_4^{2 - }$) in a sample can …
C. $0.3152\ M$
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2. which of these statements is an accurate description of the ionizati…
The ionization energy of lithium is greater than potassium.
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which elements will most likely ionize by losing two electrons? select …
Be, Mg (Two alkaline - earth metals that are likely to lose two electrons)
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9. calculate the average atomic mass for platinum. isotope pt-190 pt-19…
$195.08$
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the table below compares the solubility of two substances in 100 millil…
The solubility of hydrochloric acid increases as temperature increases.
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question 1 - 4 a student is given a sample of an unknown liquid to test…
boiling point of the liquid
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1 chemistry is often called the \central science\ because a) it is the …
1. b 2. c 3. a 4. b 5. b 6. b 7. b 8. b 9. c 10. b 11. b 12. c 13. c 14. b 15. d 16. a 17. c 18. b 19. b 20. c
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7. what are the two main types of long - term memory?* encoding and ret…
7. C. Explicit and implicit 8. D. The rest of your life
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periodic table packet #1 name____ period____ directions: use your perio…
1. Ag 2. 200.59 3. Nickel 4. Chlorine (Cl) 5. Fe, Cu 6. 11 7. He, Ne 8. F, Cl 9. W 10. 63.55 11. Kr 12. Atomic Number 13. Atomic Symbol 14. Element Name 15. Atomic Mass
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a carbon ion has 6 protons, 6 neutrons, and 7 electrons. what is its ov…
B. -1
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quiz 3 build an atom if an atom has more electrons than protons, it bec…
C. A negative ion
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which of the following will change the mass of an atom but not its iden…
Adding neutrons
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quiz 3 build an atom what happens when you add protons to an atom? the …
The element changes
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quiz 3 build an atom which subatomic particle determines the identity o…
Proton
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quiz 3 build an atom what does the atomic number represent? total mass …
B. Number of protons
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when the following equation is balanced in an acidic solution how many …
6
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9. calculate the average atomic mass for platinum. | isotope | % abunda…
- Average atomic mass of platinum: approximately $195.08$ amu - For mass number 193 (assuming neutral atom): Protons: 77, Electrons: 77, Neutrons: 116 - For atom with 64 protons a…
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question 7 of 10 what is the phase change from solid to gas? a. condens…
B. Sublimation
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match terms with the correct definition. column a 1. atomic number 2. a…
1. Atomic Number - b 2. Atomic Mass - e 3. Proton - a 4. Neutron - f 5. Electron - c 6. Valence Electrons - d
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when the amount of water in a glass slowly decreases, this is due to a.…
B. evaporation
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question 4 of 10 in degrees celsius, the boiling point of water is ____…
100
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periodic table packet #1 name______ period______ 6.4 c periodic table o…
See the above - filled table.
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question 1 of 10 match the description to the form of water that is des…
Bonds hold water molecules far apart from each other - Water vapor Least dense form of water - Ice Most dense form of water - Liquid water
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analyze and interpret the data in the table below. which prediction abo…
Francium will have the lowest melting point and the largest radius of all the alkali metals.
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the elements in group 2 have similar chemical properties because each a…
Number of valence electrons
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practice:write the electron configuration of the following: •he (z = 2)…
He: $1s^{2}$ O: $1s^{2}2s^{2}2p^{4}$ Al: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$ Ar: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ Ga: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{1}$
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17. the properties of unknown elements belonging to a periodic table fa…
Alkali metals
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16. what the correct iupac name of the compound nacl? sodium dichloride…
B. Sodium Chloride
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which of the following contains physical changes only? (1 point) color …
C. melting, boiling, dissolving
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15. which ionization energy and electronegativity periodic trends are d…
The ionization energy decreases, and the electronegativity decreases.
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4. element x is in the alkaline earth metals family. which element woul…
4. b. Strontium 2. b. Alkaline earth metals 6. c. Energy level of the valence electrons and number of protons in the nucleus 7. d. contains nearly all the atom’s volume 8. The ato…
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based on electron configuration, which atom has the greatest radius? ar…
$[Ar]4s^{2}$
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12. identify the period and group numbers of the element with the elect…
Period number: 3; Group number: 16
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11. which atom gains electrons during the formation of magnesium sulfid…
Sulfur ($S$)
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covalent substances generally have lower melting points than ionic subs…
Ionic bonds are stronger than intermolecular forces in covalent substances.
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7. using the table below, determine how many valence electrons are in a…
8