化学
化学反応、化学量論、分子構造、元素の性質。
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how many protons, neutrons, and electrons are in this ion? 75 as^{3+} 3…
\(33\ p^{+},42\ n^{0},30\ e^{-}\) (corresponding to the last option \(33\ p^{+},42\ n^{0},30\ e^{-}\))
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what type of elements are present in a metallic bond? only metallic ele…
only metallic elements
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which element will form the ion with the largest ionic radius? be b li
Li
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which element will form the ion with the smallest ionic radius? rb k cs
\(K\)
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which element will have the largest atomic radius? aluminum (al) phosph…
A. aluminum (Al)
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which characteristic belongs to most metal elements? non - conducting d…
shiny
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what do the red - colored blocks indicate? noble gases alkaline earth m…
non - metals
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which dot structure is correct for phosphorus?
The second dot - structure (the one with 5 dots around $P$) is correct.
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what is the electron configuration for fluorine, f? 1s² 2s² 2p⁶ 3s² 1s²…
1s² 2s² 2p⁵
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textbook i chapter 3 matter and energy workbook the characteristics tha…
# Explicaciones breves: 1. **Blue color**: Es una propiedad física, ya que se observa con los sentidos y no implica un cambio en la composición de la sustancia. 2. **Density**: Es…
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predict the missing component in the nuclear equation. _{12}^{23}mg \\t…
\(^{23}_{11}\text{Na}\)
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the molar mass of iron, fe, is 55.85 g/mol. how many moles of iron are …
\(2.72\)
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the average atomic mass of the element is 14.0 amu. what is the identit…
nitrogen
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what is the average atomic mass of the element in the data table?mass (…
14.0 amu
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pre - lab questions answer the following questions before attending lab…
The number of moles of \(HCl\) is \(0.040\space mol\) and the number of moles of \(NaOH\) is \(0.015\space mol\)
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what is the atomic mass of nitrogen - 15? 157n 15 8 7
\(15\)
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how would this vegetable soup be classified? a heterogeneous mixture pu…
a heterogeneous mixture
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a 250 g sample is composed of 131 g of potassium (k) and 119 g of chlor…
B. \(52.4\%\)
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which technique involves passing a mixture through a porous barrier to …
filtration
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vinegar and water are liquids that mix completely together. which techn…
distillation
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fill in the blank question the organ that oxidizes fatty acids, synthes…
liver
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rules for using significant figures in mathematical operations: - multi…
1. \(24\space g\) 2. \(2.24\space m\) 3. \(704\space m\) 4. \(19.7\space cm^3\)
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what is the noble gas configuration for sulfur? ne 3s² 3p⁴ he 3s² 3p⁴ n…
\([Ne]3s^{2}3p^{4}\)
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question 8 ether, (c₂h₅)₂o, which was originally used as an anesthetic …
15.37 62.2
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what does the 1 in \1s\ stand for? 4/20 s orbitals energy level p orbit…
energy level
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question 6 1.0 l of 0.35 m solutions of agno₃ and bacl₂ are mixed. the …
\(50.2\) ### Question 7
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different pieces of equipment allow for measurements with different lev…
The graduated cylinder.
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chemistry 11 - unit 5: gases multiple choice: record your answer on the…
B. The volume increases ### 2.
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ammonia reacts with oxygen gas to form nitrogen monoxide and water. if …
\(6.99\space mol\space O_{2}\) \(151.1\space g\space H_{2}O\)
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you see a liquid seeping out of a container. could this be a visual sig…
Yes
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11. write the formulas for the following: a. lithium oxide b. calcium n…
a. \(Li_{2}O\) b. \(Ca_{3}N_{2}\) c. \(FeBr_{2}\) d. \(NH_{4}NO_{3}\) e. \(Al_{2}(SO_{4})_{3}\) f. \(SBr_{2}\) g. \(CO_{2}\) h. \(CCl_{4}\) i. \(HNO_{2}\) j. \(H_{2}SO_{4}\)
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a solution of lead (ii) nitrate reacts with a solution of sodium iodide…
Pb(NO₃)₂(aq) + 2NaI(aq) → PbI₂(s) + 2NaNO₃(aq)
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you see a fume coming off of a piece of equipment. could this be a visu…
Yes
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carbon and silicon are located in group 14 (4a) on the periodic table. …
Carbon has 2 shells of electrons, and silicon has 3 shells of electrons.
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dawkins, nasia cms physical science midterm summative assessment what c…
loss of an electron
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an atom becomes an ion with a -1 charge because the atom gains one elec…
A. gains one electron.
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paul and karen were studying physical and chemical properties of matter…
The mass of a substance is a way to measure the amount of matter it contains.
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sodium bicarbonate (nahco₃) is commonly known as baking soda. sodium bi…
It releases carbon dioxide.
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a nuclear power facility harnesses energy via what energy process? nucl…
nuclear fission
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deep in the core of the sun, 620 million metric tons of hydrogen nuclei…
A. The "missing mass" is transformed into energy in a fusion reaction.
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which of the following is an organic molecule? water carbon dioxide sal…
glucose
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if a sample of water releases 3251 j of energy as the temperature decre…
$97.1$
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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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3. can an ionic compound ever consist of a cation - cation or anion - a…
No, an ionic compound cannot consist of a cation - cation or anion - anion bond.
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1. do metals form anions or cations?
Metals form cations.
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question 2 (1 point) listen the element that has the electronic configu…
4) Ar
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question 1 (1 point) the electronic configuration of chlorine is 1) 1s²…
1) \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\)
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2 which statement best describes engraving? a. it involves the use of a…
D. It involves the use of a burin to cut lines.
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select the correct answer. which of these elements is an alkaline earth…
B. calcium (Ca)
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select the correct answer. which of these elements has four valence ele…
C. silicon (Si)
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practice: ionic compounds with polyatomic ions background a polyatomic …
1. Ammonium chloride 2. Copper(II) nitrate 3. Strontium nitrate 4. Lithium hydroxide 5. Calcium carbonate 6. Lead(II) sulfate 7. Sodium nitrite 8. Potassium chlorate 9. Sodium bic…
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what is the formula for phosphorus pentachloride? pcis question 5 1 pts…
Shared
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question 3 1 pts what is the formula for selenium hexachloride? questio…
Selenium Hexachloride: \(SeCl_6\) Phosphorus Pentachloride: \(PCl_5\)
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name the following compound p₂o₂ question 2 name the following compound…
\(P_2O_5\): diphosphorus pentoxide \(P_4S_3\): tetraphosphorus trisulfide
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name the following compound agclo3 question 4 what is the correct formu…
Silver chlorate
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name the following compound nano3 question 2 name the following compoun…
1. Sodium nitrate 2. Manganese(III) phosphate
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what is the correct formula for aluminum bromide? question 5 what are t…
\(AlBr_{3}\)
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name the following compound agcl question 3 what is the correct formula…
1. Silver chloride 2. \(CrF_{2}\)
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must do: transition binary ionic started: oct 28 at 9:17am quiz instruc…
iron(III) sulfide
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question 3 name the following compound mg3p2
Magnesium phosphide
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multiple - choice question what is true about solids? they generally ha…
They generally have a fixed mass and volume.
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what color do acids turn litmus paper? pink blue yellow red
red
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which property do solutions with high ph values have? tastes sour feels…
B. feels slippery
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which term do these characteristics describe? the substance is not unif…
heterogeneous mixtures
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which choice can be classified as a pure substance? homogeneous mixture…
compound
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what is a substance said to be if it is changing from a vapor to a liqu…
condensing
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what reaction would the chemical equation ( ch_{4}+2o_{2}\to2h_{2}o + c…
combustion of methane
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what is true when a reaction has reached equilibrium? the reaction has …
C. The reaction rate is equal in both directions
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how do ionic bonds differ from covalent bonds? electrons are shared in …
Electrons are shared in a covalent bond.
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which chemical formula shows a covalent compound? mgo co₂ libr nacl
CO₂
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which statement about endothermic reactions is true? more heat is given…
Energy from an outside source is continuously being added.
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7. now, please complete the interactivity by clicking on one of the sta…
1. True 2. True 3. d) All of the above 4. d) Both A and B 5. c) The particles in a solid are packed very close to each other 6. d) All of the above 7. a) Liquid becomes a gas 8. d…
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15. students in a chemistry course were asked the following question on…
Drawing A is the best representation. An element is a pure substance with only one type of atom, and Drawing A shows multiple atoms (as elements in bulk have many atoms), while Dr…
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completar el espacio en blanco 1 punto elija su respuesta... is an orga…
Vitamin
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quiz - atoms, moles, molecules, mass and volume conversions there are t…
7. \(60\space g/mol\) 8. \(180\space g/mol\) 9. \(214.5\space g/mol\)
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quiz- atoms, moles, molecules, mass and volume conversions there are th…
7. \(60\) g/mol 8. \(180\) g/mol 9. \(214.5\) g/mol
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in the reaction of formation of magnesium oxide magnesium undergoes ___…
D. oxidation
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oxidation is defined as: a the loss of electrons and an increase in oxi…
A. the loss of electrons and an increase in oxidation number
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the following reaction represents the action of bleaching powder in wat…
A. \(Ca(OCl)_2\)
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when the following equation is balanced with the smallest possible inte…
D. 6
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scientists use different types of models to study the composition of ma…
1. space - filling model 2. particle model for water molecules in ice 3. chemical formula \(H_2O\)
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directions: drag each picture to the correct location on the chart. the…
- **Atom**: single orange sphere, single red sphere - **Molecule**: combination of red, blue, and red spheres; combination of red and two white spheres; two - orange - sphere comb…
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directions: select each correct location on the diagram. a model of a h…
The two blue spheres with '+' signs in the nucleus.
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______ and ______ are located in the nucleus of the atom, while ______ …
A. Protons; neutrons; electrons
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the diagram below shows a portion of the periodic table of the elements…
D. 8
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directions: balance each chemical reaction below and then classify the …
Balanced equation: \( 2\text{HBr}+\text{Mg(OH)}_2=\text{MgBr}_2 + 2\text{H}_2\text{O} \), Classification: Acid - Base (AB)
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directions: select the correct image. a molecule is two or more atoms b…
The image with two blue balls connected by a stick.
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16. which of these is not named correctly? a. monocarbon dioxide, co₂ c…
A. Monocarbon dioxide, \(CO_2\) # 17.
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9. which element will have a similar lewis dot structure to that of sul…
9. B. Oxygen 10. C. 22 11. D. \(H-\ddot{O}-H\) 12. B. Tetrahedral 13. A. Linear 14. B. \(120^{\circ}\) 15. C. Phosphorus pentabromide
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13. the shape of a co₂ molecule is lewis structure for co₂ : f : ( ddot…
13. A. Linear 14. B. \(120^{\circ}\) 15. C. Phosphorus pentabromide
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answer each of the following by choosing the best answer choice. 3 poin…
1. a. two atoms combine to form a molecule. 2. c. Two nonmetals 3. d. 4 4. a. Shared 5. c. Low 6. b. Soft 7. c. Valence electrons are the outermost electrons of an atom. 8. b. 6
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directions: balance each chemical reaction below and then classify the …
1. AB 2. DD 3. DD 4. C 5. S 6. D 7. C 8. SD 9. AB 10. SD 11. D 12. S 13. DD 14. D 15. S 16. AB 17. SD
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directions: use a periodic table to determine the atomic mass, atomic n…
| Ion | Atomic Number | Atomic Mass | Number of Protons | Number of Electrons | Number of Neutrons | | --- | --- | --- | --- | --- | --- | | \(Li^{+}\) | \(3\) | \(7\) | \(3\) | \…
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12. a ring of muscle at the end of the stomach controls the flow of foo…
12. pyloric sphincter; small intestine 13. bile 14. gallbladder 15. pancreas 16. Intestinal juice 17. villi
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8. magnesium and oxygen gas combine to form magnesium oxide type of rea…
Combination Reaction
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4. —caf_{2}+—li_{2}so_{4}→—caso_{4}+—lif
\(CaF_{2}+Li_{2}SO_{4}\to CaSO_{4}+2LiF\)
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2. \\frac{}{\\mathrm{pcl}_{5}} \ ightarrow \\frac{}{\\mathrm{pcl}_{3}}+…
\(2PCl_{5}\to 2PCl_{3}+Cl_{2}\)
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select the ring stand.
The first image.
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october 28, 2025 1. what part of an atom contains protons and neutrons?…
# Explicaciones breves: 1. El núcleo es la parte del átomo que contiene protones y neutrones. 2. Las regiones donde se encuentran los electrones en un átomo son las capas electrón…
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how does waters polar structure impact its ability to form solutions wi…
The last option: Water is attracted to other polar molecules, allowing water to wedge between other polar molecules and break them down, forming a solution.