化学
化学反应、化学计量、分子结构与元素性质。
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topic5 d4 assessment periodic table 7 of 42 1. atoms of elements in gro…
one electron in their outermost energy level.
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18. electron configurations can be represented in an abbreviated form a…
tin - \([Kr]5s^{2}4d^{10}5p^{2}\)
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topic5 d4 assessment periodic table 6 of 42 1. why are both hydrogen an…
Blocks of elements on the periodic table are based only on an element's valence electrons.
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an element is a solid at room temperature, has luster, is conductive an…
Transition metals
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1. looking only at the box below, what can you say for certain about th…
The element will have atomic number 9.
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12. the lewis valence dot electron structures are used to illustrate th…
5
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1. why do atomic numbers jump by 15 from left to right in the section o…
The missing elements form the lanthanide and actinide series, usually found below the periodic table.
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definition the outputs of a chemical reaction. located on the right sid…
products
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definition the inputs of a chemical reaction. located on the left side …
reactants
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topic5 d4 assessment periodic table 3 of 42 1. halogens are good disinf…
D. Cl
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topic5 d4 assessment periodic table 2 of 42 1. which group on the perio…
group 2A
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topic5 d4 assessment periodic table 1 of 42 1. which of the following a…
nonmetals
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15 a student observes that element x has a completely filled outer vale…
Element X would likely be unreactive (chemically inert). This is because a completely filled outer valence electron shell gives it a stable electron configuration. Atoms tend to r…
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qe 9 an atom has the electron configuration ( 1 s ^ { 2 } 2 s ^ { 2 } 2…
The third option (the one with 8 dots around the \(X\)) is the correct electron - dot symbol.
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the outputs of a chemical reaction. located on the right side of a chem…
3. products
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students are conducting an experiment to identify an unknown solid, and…
sodium
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the inputs of a chemical reaction. located on the left side of a chemic…
4. reactants
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electronegativity 6. which of the following is the best explanation for…
F has the largest electronegativity because the electrons in element F have the largest attraction to the nucleus.
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4. pure sodium metal reacts violently with water to produce sodium hydr…
Sodium metal has only a single valence electron and has a very low ionization.
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what is the preferred type of tool for cleaning lead battery post? scra…
B. Brush Style
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considering all of the locations of water on earth, where do water mole…
in groundwater
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li has an ionization energy of 520 kj/mol. f has an ionization energy o…
Fluorine has strong attractive forces between the nucleus and the electrons. It takes more energy to remove an electron from fluorine than lithium.
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2. the following chart lists elements atomic radii in the periodic tabl…
\(220\)
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boron has the average atomic mass of 10.81 and has two naturally occurr…
Boron - 11 is more abundant.
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\matter cannot be created nor destroyed\ forms the basis of which of th…
The Law of Conservation of Matter
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identify 3 important acids and state their importance. 1. 2. 3. questio…
1. battery acid 2. milk of magnesia 3. color 4. Many acids are harmful and can cause burns or poisoning. Just because some acids (like in food/drink) are safe to consume in small …
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review the details below. dmitri mendeleevs periodic table contained on…
In 1869, Russian chemist Dmitri Mendeleev invented the first periodic table of the elements.
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consider the following chemical equation. zns + o₂ → zno + so₂ which of…
C. \(2ZnS + 3O_2 ightarrow 2ZnO + 2SO_2\)
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what is the correct chemical formula for dinitrogen tetroxide? a n₂o₄ b…
A. \(N_2O_4\)
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according to the law of conservation of mass, 8 grams of hydrogen and 3…
40 grams
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which equation is balanced? miss zoo was wading in the pool. the victim…
\(2Al + 3CuO ightarrow Al_2O_3+3Cu\)
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3. what volume of vinegar contains 75.6 g of acetic acid if the solutio…
The volume of vinegar is approximately $1.42\ \text{L}$.
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the image shows a chemical reaction in which iron combines with oxygen …
\(4Fe + 3O_{2} ightarrow2Fe_{2}O_{3}\)
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dilutions worksheet 1) if i have 340 ml of a 0.5 m nabr solution, what …
1. \(0.19\space M\) 2. \(0.033\space M\) 3. \(0.625\space M\) 4. \(1500\space mL\)
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sodium hydroxide can be produced commercially from the electrolysis of …
C. The oxidation number of each \(Cl\) atom changes from \(-1\) to \(0\), and some \(H\) atoms change from \(+1\) to \(0\)
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the student claims that the reaction is an oxidation - reduction reacti…
D. The oxidation number of oxygen changes from \(-1\) to \(0\)
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a coefficient is the small number placed below an element; a subscript …
A coefficient is the small number placed in front of a formula, a subscript is a large number placed below an element; A coefficient indicates how many molecules of a compound; a …
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which of the following best describes this equation? mg + o₂ → mgo the …
The equation \(Mg + O_2 ightarrow MgO\) is not balanced because there are more atoms of oxygen in the reactants than there are in the product.
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in order to balance a chemical equation, which of the following should …
Coefficients
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which statement explains how the bands in the crystal of a metal are li…
They both allow electrons to move from lower energy levels to higher energy levels.
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instructions: for each trend listed below, circle the arrows that corre…
21. ↑, → 22. ↑, → 23. ←, ↓ 24. ←, ↓ 25. ↑, →
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consider the unbalanced equation for the oxidation of aluminum. _al + _…
\(4,3,2\)
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a teacher wants to perform a classroom demonstration that illustrates b…
burning a candle
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instructions: for each of the following pairs, determine which atoms wi…
14. Sr 15. K 16. Li 17. Rb
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feet pound pavement as miles pass, steady as tides, they approach their…
- The poem has an abcb rhyme scheme. - The poem contains two stanzas. - Each stanza is a quatrain.
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instructions: use the figure shown below to answer question 13. 13.____…
Atom 2
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the metalloid that is used to make computer chips is ______. enter the …
Silicon
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in a balanced equation, the total number of atoms of each element on th…
equal to
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gallium, ga, reacts with chlorine gas to produce gallium(iii) chloride.…
B. 2
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recall it! drag and drop the words or phrases that accurately complete …
melting, evaporation, evaporation, condensation, precipitation, Conservation
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instructions: for each of the following pairs, predict which atom has t…
9. \(N\) 10. \(O\) 11. \(Be\) 12. \(Mg\)
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9 mark for review which of the following is the balanced net - ionic eq…
B. \(2Li(s)+2H_2O(l)\to2Li^{+}(aq)+2OH^{-}(aq)+H_2(g)\)
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for each of the following pairs, predict which atom or lon is smaller. …
5. \(Li^+\) 6. \(O\) 7. \(Cl\) 8. \(Al^{3+}\)
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a student finds the mass and volume of four mystery liquids. the data i…
W
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suppose you have a new mountain bike and accidentally spilled a can of …
D. ~1000 times
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which of the following compounds at 25°c and 1.0 atm contains an elemen…
D. \(Cu_2O\)
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question 11 the ph of lemon juice is approximately 2.40. at this ph, th…
\(4.0\times 10^{-3}\space M\)
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instructions: rank the following atoms in order of increasing atomic ra…
1. \(Br < Ca < K<Ar\) 2. \(B < Ga < In < Tl\) 3. \(F < Cl < Br < I\) 4. \(O < N < B < Li\)
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6 mark for review a 23.0g sample of a compound contains 12.0g of c, 3.0…
B. \(C_{2}H_{6}O\)
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first read: concept vocabulary identify the choice that best answers th…
D. surrounding air
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7. a gradual process of change and replacement of the types of species …
- **Question 7**: C. ecological succession - **Question 8**: C. All answers are correct.
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6. which type of mixture has varying sizes of particles that are large …
6. c. suspension 7. c. mixture of element \(X\) and \(Y\) atoms 8. d. salt water 9. a. suspension
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a piece of sodium metal can be described as o a pure substance and a co…
a pure substance and an element.
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which is a set of valid quantum numbers? ( n = 4, l = 4, m = 4 ) ( n = …
\(n = 4,l = 3,m = 3\)
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multiple-choice question in a chemical reaction, energy may be gained o…
True
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which is a postulate of the kinetic - molecular theory? gas particles h…
Gas particles have a small volume relative to the spaces between them.
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the chemical equation below shows the decomposition of ammonium nitrate…
72.06 grams
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the molar mass of water (h₂o) is 18.0 g/mol. a sample of water has a ma…
1.00 mole
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conservation of mass/energy conservation of mass - todd ramsey multiple…
Energy
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answer: how many electrons can be assigned to orbitals designated by th…
6
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1. which is an example of a mixture of gases? a. air b. iron c. rock d.…
A. air ### 2.
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multiple-choice question breaking the bonds between atoms in a compound…
False
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multiple - choice question when atoms form compounds, energy is stored …
True
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multiple - choice question what does energy do to matter? energy destro…
B. Energy allows matter to be rearranged into new molecules and compounds.
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free response question--worth 10 points why does helium only have 2 val…
Helium is in Group 18. Its valence electrons are in the first orbital (\(1s\)) which can hold only 2 electrons. Other group - 18 elements (with valence electrons in \(n\geq2\) orb…
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complete the following covalent compound names and use two decimals to …
- **N₂O₃**: - Nombre: Dinitrógeno trióxido - Masa molar: \(76.00\,\text{g/mol}\) - **ClO₂**: - Nombre: Cloro dióxido - Masa molar: \(67.45\,\text{g/mol}\) - **SF₆**: - Nombre: Sul…
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complete the following covalent compound names and use two decimals to …
- For \(N_2O_3\): Name - dinitrogen trioxide, Molar mass - \(76.00\space g/mol\) - For \(ClO_2\): Name - chlorine dioxide, Molar mass - \(67.45\space g/mol\) - For \(SF_6\): Name …
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1. how many moles of magnesium is 3.01 x 10²² atoms of magnesium? 2. ho…
1. Approximately $0.05$ mol 2. $1.5055\times10^{24}$ molecules 3. Approximately $3.99\times10^{-20}$ mol 4. $5.1187\times10^{23}$ atoms 5. Approximately $0.0483$ mol 6. Approximat…
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because an achiral molecule is symmetrical, flipping it yields a struct…
C. by contrast,
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a synonym for \combustion\ to burp to heat up to burn to blow up
to burn
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6 the chart shows some properties of the element carbon. which property…
C. number of electrons
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¿cómo se organizan los elementos en la tabla periódica? * alfabéticamen…
- ¿Cómo se organizan los elementos en la tabla periódica? C. Por propiedades químicas y físicas similares - ¿Cómo se llaman las filas horizontales de la tabla periódica? B. Períod…
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¿como se llama cada columna de la tabla periódica? período grupo unidad…
- Grupo - 18 - Verdadero
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¿dónde se encuentran los electrones? dentro del núcleo fuera del núcleo…
- **¿Dónde se encuentran los electrones?** Fuera del núcleo - **¿En qué grupo se encuentra el elemento número 7, nitrógeno (N)?** 15
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¿cuál es el número atómico del nitrógeno (n)? * 4 6 7 8 un ion tiene 4 …
# Explicación breve: - **Primera pregunta**: El número atómico del nitrógeno (N) se encuentra en la tabla periódica. El nitrógeno tiene 7 protones, por lo que su número atómico es…
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un isótopo del carbono, el carbono - 13, tiene 7 neutrones y 6 protones…
- Primera pregunta: 13 - Segunda pregunta: Electrón - Tercera pregunta: Tiene un número diferente de neutrones.
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multiple - choice question a monomer is a chain of molecule single atom…
building block
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¿cuál es la carga neta de este ion? 0 -1 5 3 ¿en comparación con un áto…
# Explicación breve: Para encontrar la carga neta del ion, se calcula la diferencia entre el número de protones (carga positiva) y el número de electrones (carga negativa). En la …
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¿cuál es la diferencia entre un átomo y un ion? los iones tienen una ca…
1. Las iones tienen una carga neta (una carga distinta de cero) 2. 4 protones y 4 electrones 3. 6
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¿en qué período se encuentra el elemento número 23 - vanadio (v)? 1 2 3…
4 +2
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esto se llama el componente básico de la materia * partícula asunto áto…
C. Átomo
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¿cuáles son las 3 partículas subatómicas que componen un átomo? protone…
protones, neutrones, electrones
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read the passage and answer the following question(s). human activities…
A. Limiting the clearing of land for building houses, B. Using renewable energy sources instead of fossil fuels
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what do these two changes have in common? adding dish soap to water in …
Both conserve mass.
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what do these two changes have in common? water evaporating from a lake…
Both are changes of state. Both conserve mass.
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what do these two changes have in common? deep - frying chicken melting…
Both are caused by heating, Both conserve mass.
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what do these two changes have in common? making jam firing a clay pot …
Both are caused by heating. Both conserve mass.
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what do these two changes have in common? water vapor condensing on a b…
Both are only physical changes.
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the image shows the periodic grid for potassium. how many protons are f…
\(19\)
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14/17 what is a positive ion called? covalent cation anion isotope
cation