化學
化學反應、化學計量、分子結構與元素性質。
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what is another name for the representative elements? transition elemen…
C. Group A elements
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what causes the shielding effect to remain constant across a period? el…
Electrons are added to the same principal energy level.
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in which of the following groups of ions are the charges all shown corr…
\(Ca^{2+},Al^{3+},Br^{-}\)
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what element in the second period has the largest atomic radius? lithiu…
lithium
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elements that are characterized by the filling of p orbitals are classi…
groups 3A through 8A
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who arranged the elements according to atomic mass and used the arrange…
C. Dmitri Mendeleev
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which of the following statements is true about ions? anions form when …
Cations form when an atom loses electrons.
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of the following elements, which one has the smallest first ionization …
aluminum
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which of the following is true about the electron configurations of the…
The highest occupied s and p sublevels are partially filled.
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9cw1 how does the energy of an electron change when the electron moves …
It decreases.
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how many energy sublevels are in the second principal energy level? 2 1…
2
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the outermost s orbital of an atom contains two electrons. always true …
Sometimes true
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stable electron configurations are likely to contain electrons with a c…
filled energy sublevels.
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what is the maximum number of d orbitals in a principal energy level? 1…
5
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which electron configuration of the 4f energy sublevel is the most stab…
\(4f^{14}\)
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9cw1 when an electron moves from a lower to a higher energy level, the …
absorbs a quantum of energy.
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match each item with the correct statement below. region of high probab…
- region of high probability of finding an electron - atomic orbital - lowest energy level - ground state - tendency of electrons to enter orbitals of lowest energy first - aufbau…
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what is the maximum number of orbitals in the p sublevel? 2 3 5 4
3
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what types of atomic orbitals are in the third principal energy level? …
s, p, and d only
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the letter \p\ in the symbol 4p³ indicates the ______. principle energy…
orbital shape
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which scientist developed the quantum mechanical model of the atom? nie…
Erwin Schrodinger
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ules video multiple - choice question ______________________ and ______…
protons and neutrons
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what is another name for the representative elements? transition elemen…
Group A elements
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9cw2 compared with the electronegativities of the elements on the left …
higher
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elements that are characterized by the filling of p orbitals are classi…
groups 3A through 8A
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each period in the periodic table corresponds to a(n) _____. orbital en…
principal energy level
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the modern periodic table is arranged in order of increasing atomic cha…
number
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which of the following elements has the lowest electronegativity? fluor…
lithium
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which of the following is true about the electron configurations of the…
The highest occupied \(s\) and \(p\) sublevels are partially filled.
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what element in the second period has the largest atomic radius? lithiu…
lithium
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of the following elements, which one has the smallest first ionization …
aluminum
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in which of the following sets are the charges given correctly for all …
\(K^{+}, Sr^{2 +}, O^{2-}\) (the fourth option)
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to what category of elements does an element belong if it is a poor con…
nonmetals
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which of the following elements has the smallest atomic radius? bromine…
chlorine
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in which of the following groups of ions are the charges all shown corr…
\(Ca^{2+},Al^{3+},Br^{-}\) (the fourth option)
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what is another name for the transition metals? group b elements group …
Group B elements
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match each item with the correct statement below. horizontal row in the…
- horizontal row in the periodic table: period - vertical column in the periodic table: group - A repetition of properties occurs when elements are arranged in order of increasing…
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what is the energy required to remove an electron from an atom in the g…
ionization energy
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which of the following groupings contains only representative elements?…
Al, Mg, Li
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what causes the shielding effect to remain constant across a period? th…
Electrons are added to the same principal energy level.
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what is the charge of a cation? the charge depends on the size of the n…
a positive charge
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which of the following decreases with increasing atomic number in group…
Ionization energy.
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what is the element with the highest electronegativity value? cesium he…
fluorine
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kwame created a special mixture of bleach and fragrances to use when wa…
He is storing a poisonous substance in an old food container.
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3. explain how the molecular structure of kevlar helps it to be effecti…
Kevlar has long chains because of its molecular structure. The number of hydrogen bonds between chains determines its strength. This results in strong attractive forces. Kevlar is…
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ex. a) how many moles of ammonia are produced when 9.0 mol of hydrogen …
\(2.0mol\)
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step 3 and 4 electron transfer of the compounds na + cl mg + cl
| Electron transfer of the Compounds | Formula | Name | | ---- | ---- | ---- | | \(Na + Cl\) | \(NaCl\) | sodium chloride | | \(Mg + Cl\) | \(MgCl_{2}\) | magnesium chloride |
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covalent bonds - by walterinejess covalent bonding can be modeled by ki…
Covalent bonds: equal (non - polar, \(H - H\)) or unequal (polar, \(Cl - H\)) sharing, like kids with toys.
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metallic bond - by baileyduxbury write a 25 word summary explaining the…
Metallic bonds have positive ions and electron sea, giving metals properties like conductivity and reflectivity.
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three types of chemical bonds diagram electrostatic attraction/repulsio…
Ionic bonding: metal (Na) donates electron to non - metal (Cl). Opposite charges attract, forming solid (NaCl).
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practice it reality - distorting strategy of the ego to prevent awarene…
defense mechanism
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identifying properties of substances and mixtures which properties are …
- **Pure Substances**: Have consistent properties, Cannot be separated physically - **Mixtures**: Can be separated physically, May be multiple states of matter
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the density of gold is 19.3 g/cm³. what is the volume of a 13 g gold nu…
\(0.67\space cm^{3}\) (corresponds to the second option \(67\space cm^{3}\) if we consider a possible typo in the options where it should be \(0.67\space cm^{3}\) instead of \(67\…
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using density to identify a metal use the information in the table to i…
zinc
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question 9 of 10 read these lines from emily dickinsons poem \324\ (\so…
D. \(abcb\)
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complete the following table: some polyatomic ions name chemical formul…
| name | chemical formula | | ---- | ---- | | sulfate anion | \(SO_{4}^{2 -}\) | | peroxide anion | \(O_{2}^{2 -}\) | | ammonium cation | \(NH_{4}^{+}\) | | chromate anion | \(CrO…
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does the following text have an inappropriate shift in verb tense? if s…
I recently learned that the periodic table lists elements in order of increasing atomic number, from left to right and top to bottom.
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the 2022 nobel prize in chemistry was awarded to three pioneers in the …
B. Stanford,
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li+ express your answer in complete form, in order of increasing orbita…
\(1s^{\wedge}2\)
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which statement primarily appeals to ethos to support the position that…
The statement “Having worked as a high school chemistry teacher for more than fifteen years, I have seen the positive influence that elective courses have had on my students.” pri…
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question what is the partial pressure in atmospheres of co₂ if a mixtur…
\(0.58\) atm
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compared with the electronegativities of the elements on the left side …
B. higher
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what is the next atomic orbital in the series 1s, 2s, 2p, 3s, 3p? 4s 2d…
4s
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what is the maximum number of electrons in the second principal energy …
8
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which of the following statements is true about ions? cations form when…
Cations form when an atom loses electrons.
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calculating the density of propane use the mass and volume data to calc…
\( 0.43 \)
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calculating the volume of corn syrup use the mass and density data to c…
\(41.5\)
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calculating the density of lead use the mass and volume data to calcula…
11.35 \(g/cm^{3}\) (corresponding to the second option)
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question 18 18 - month - old gordon learned the schema for apples. when…
A. accommodation
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question 16 which term refers to the adjustment of a schema by adding i…
A. assimilation
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how do you calculate or identify the number of: protons= neutrons= elec…
- Protons: Equal to the atomic number of the element. - Neutrons: \(n = A - Z\) (where \(A\) is the mass number and \(Z\) is the atomic number). - Electrons: - Neutral atom: Equal…
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directions: fill in the chart with the number of electrons on the outer…
| Element | # Valence Electrons | | ---- | ---- | | Be | 2 | | Na | 1 | | Al | 3 | | C | 4 | | Cl | 7 | | Ar | 8 | | He | 2 | | O | 6 | | Rb | 1 | | S | 6 |
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what happens to the mass of each element throughout the periodic table?…
B. It increases left to right, C. It increases top to bottom
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a substance that influences the reaction but does not participate in th…
catalyst
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list all the elements that would have similar chemical properties as be…
1. Magnesium (Mg) 2. Calcium (Ca) 3. Strontium (Sr) 4. Barium (Ba) 5. Radium (Ra)
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a scientist is conducting an investigation that involves water, silver,…
They are each made of matter. Some are compounds and some are elements. They all contain atoms.
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question 23 of 45 how did advancements in technology differentiate worl…
B. Powerful tanks and aerial bombings made trench warfare obsolete.
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which of the following chemical equations is balanced correctly? o a. c…
d. \(CS_2 + 3Cl_2\to CCl_4+S_2Cl_2\)
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directions: type in the box. study the table which atom has a positive …
\( Y \)
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different elements are most likely to react in similar ways when they..…
B. Are member of the same group/family
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hydrogen (h) reacts with oxygen (o) to form water (h₂o). the properties…
A. Different from O & H
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which will increase the rate of a chemical reaction? adding a catalyst …
Adding a catalyst.
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mgf₂ + li₂o₃ → mgo₃ + lif **hint** you only need to add coefficients wh…
The coefficient in the box is \(2\). | Element | # of atoms before balancing | # of atoms AFTER balancing | | ---- | ---- | ---- | | \(Mg\) | \(1\) | \(1\) | | \(F\) | \(2\) | \(2…
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which statement best describes the relationship between activation ener…
Reducing the activation energy can increase the rate of a reaction.
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**hint** you only need to add coefficients where the orange boxes are!
The first box (coefficient for \(HgO\)) is \(2\), and the second box (coefficient for \(Hg\)) is \(2\). For the left - hand table: - For \(Hg\): number of atoms before balancing i…
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**hint** you only need to add coefficients where the orange boxes are!
The coefficients are 4 (for \(Na\)) and 2 (for \(Na_2O\)). Left - hand side table (before balancing): \(Na:1\), \(O:2\); (after balancing): \(Na:4\), \(O:2\) Right - hand side tab…
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read the following information from a material safety data sheet (msds)…
Remove the shirt, and rinse the skin with water.
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a scientist is working with methane (ch4) and butane (c4h10). which sta…
They are compounds made of the same two elements, but each contain different numbers of atoms.
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name: date: period a sample of oxygen gas has a beginning volume of 4 l…
\(P_1 = 387\) atm, \(V_1 = 4\) L, \(V_2=1.75\) L, \(P_2\approx884.57\) atm.
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st your knowledge question 3 combination decomposition double displacem…
\(2NaCl \to 2Na+Cl_{2}\): Decomposition; \(2Na + Cl_{2}\to2NaCl\): Combination; \(Li+NaCl\to LiCl + Na\): Single displacement; \(AgNO_{3}+NaCl\to AgCl+NaNO_{3}\): Double displacem…
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categorize each change as physical change or chemical change. a butane …
- Chemical change: A butane lighter produces a flame, A screwdriver left outside in the rain rusts, Barium hydroxide mixed with ammonium chloride becomes colder, Silver tarnishes …
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you are comparing the surface tension on two bodies of water: a fresh -…
B. the salt - water pond because it has a higher density
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some researchers have hypothesized that there could be trace metals in …
use an atomic absorption spectrometer to detect elements and compounds
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milo is boiling water, but it is taking a long time for the water to re…
C. Water has a high heat capacity
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use the table of electronegativities, above, to determine which type of…
| Atom 1 | Atom 2 | Electronegativity Difference Value | Bond Type (Non - polar Covalent, Polar, Ionic) | |---|---|---|---| | Phosphorus | Silicon | \(0.3\) | Non - polar Covalent…
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electronegativity worksheet name block 1. how are ionic bonds and coval…
1. Ionic bonds: electron transfer (metal - non - metal, electrostatic). Covalent bonds: electron sharing (non - metal - non - metal). 2. Polar covalent: unequal electron sharing (…
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question 2 of 10 which sentence describes a poems meter? ○ a. every thi…
A. Every third syllable in each line is accented.
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question 2 what mass of n₂o₄ (g) is needed to produce 48.5 g of n₂ (g) …
\(88.50\)
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question 8 how many grams of solid product will be produced from 17.09 …
\(12.14\)
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question 7 given the balanced equation below, how many grams of sodium …
\(1.62\)