Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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francium is in period 7 and group 1 and has an atomic number of 87 and …
2. 7 3. 87
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1. choose the best answer. which of these element groups includes many …
transition
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4) check if each statement describes an alkali metal, an alkaline earth…
- has one valence electron: Alkali Metal - has two valence electrons: Alkaline Earth Metal - found in group 2: Alkaline Earth Metal - found in the d - block: Transition Metal - hi…
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3) choose all that apply. which two are properties of all metals? good …
good conductor of heat and electricity, luster
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2) choose the best answer. what are the eight metalloids? copper (cu) a…
B. antimony (Sb), C. silicon (Si), D. tellurium (Te), F. astatine (At), G. polonium (Po), H. arsenic (As), I. germanium (Ge), J. boron (B)
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19) choose the correct electron configuration for the element. refer to…
19) \([Ar]4s^{2}3d^{10}\) 20) \([Ar]4s^{2}3d^{6}\)
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17) choose the correct electron configuration for the element. refer to…
\(1s^{2}\) # 18)
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15) choose the best answer. refer to the periodic table. what is the el…
15) \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{2}\) 16) \([Ar]4s^{2}3d^{10}4p^{2}\)
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13) choose all that apply. refer to the periodic table. what sublevels …
A. \(s\), C. \(d\), D. \(p\)
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11) choose the best answer. refer to the periodic table. what is the el…
\(1s^{2}2s^{2}2p^{3}\) ### Question 12
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8) type the correct answers in the blanks. refer to the periodic table.…
7 2 2 C. p, D. s
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7) drag and drop the electron configurations to the elements. refer to …
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\) → \(Cl\); \(1s^{2}2s^{2}2p^{3}\) → \(N\); \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}\) → \(Al\); \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}\) → \(Zn\)
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5) choose the best answer. which of these elements can be used to write…
Ar # 6)
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3) choose the best answer. which rule states that orbitals of equal ene…
3) Hund's rule 4) Pauli exclusion principle
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1) choose the best answer. what is electron configuration? the number o…
1. the arrangement of electrons in an atom 2. Aufbau principle
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soaps, similar to the ones used to wash grease from the pots in your ki…
A molecule that would clean the oil off of birds is one that can dissolve in both water and oil. Such a molecule has a nonpolar tail, which is a long hydrocarbon region. This regi…
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so far we know three things: to clean these birds we need a substance t…
It must have polar and nonpolar regions.
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you just learned the concept of \like dissolves like.\ this means that …
Oils are nonpolar substances. An oil molecule would not likely dissolve in water because water molecules are polar. At a molecular level, water molecules are more attracted to eac…
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when you think about how you can clean oil off of birds and other anima…
C. Polar substances dissolve in polar substances, D. Nonpolar substances dissolve in nonpolar substances.
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the molecule you just labeled fits neither of those two categories. it …
No, because this molecule is nonpolar.
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15) choose the best answer. (see companion material, the periodical tab…
Ca
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13) choose the best answer. (see companion material, the periodical tab…
13) 5 14) 14
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11) choose the best answer. (see companion material, the periodical tab…
11) Co 12) Nd
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now, lets connect what you learned from examining isopropyl alcohol to …
It should have a polar region that concentrates electrons in a particular part of the molecule; It could contain an area with a full charge such as an ion.
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9) choose the best answer. which sublevels are found in the 4th energy …
9) \(s,p,d,\text{and }f\) 10) a. \(2\) b. \(6\) c. \(10\) d. \(14\)
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7) choose the best answer. how do you determine the number of energy le…
7) It is the same number as the period number. 8) 7
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3) choose the best answer using a periodic table. (see companion materi…
The first option (the one with 7 dots around Cl) is the correct Lewis dot structure for Cl.
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1) choose the best answer. elements in a group have similar properties …
1. valence electrons 2. It is the same number as the last digit of the group number.
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15. choose the best answer. atomic masses _____ across a period and ___…
increase; increase ### Question 16
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so far, it seems like youve established that isopropyl alcohol has area…
Isopropyl alcohol will dissolve in water, because they are both polar molecules.
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uranium has three common isotopes that naturally occur in the earth: $^…
238 amu For the second question:
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11. choose the best answer. atomic numbers ____ across a period and ___…
11. increase; increase 12. column
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____ is the repetition of chemical properties according to atomic numbe…
1. Periodicity 2. law of octaves
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the atomic mass number is ____. 235 146 143 238 92 6. choose the best a…
- For the atomic mass number: 238 - For the number of protons: 92
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lets revisit your case now that weve learned a little bit about what ca…
It must have areas of both positive and negative charge such that they cancel each other out; It is a water - soluble ion with a full charge.
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now, lets take a look at another molecule to determine if it will disso…
Iodine is held together with strong covalent bonds and lacks any significantly charged regions. The interactions between water and iodine are not strong enough to overcome these c…
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1. choose the best answer. ____ of an element have the same number of p…
1. Isotopes 2. law of triads
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the arrangement of water molecules around an ion is called a hydration …
\(Li^{+}\), \(Cl^{-}\), \(Mg^{2+}\)
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13) choose the best answer. atomic numbers ____ across a period and ___…
13) D. increase; increase 14) B. increase; increase
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rubidium is known to have two isotopes - 87rb and 85rb. the abundance o…
For Rubidium: 85.31 amu; For Titanium: 48.1 amu
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what attracts water to the different parts of salt? why would water be …
- The oxygen in water is attracted to the positively charged sodium ion. - The hydrogen atoms of water are attracted to the negatively charged chloride ion.
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7) choose the best answer. which statement is true about isotopes? isot…
- 7) Isotopes of an element have the same number of protons but a different number of neutrons. - 8) \(_{36}^{84}Kr\)
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5) use the image to answer the question. 10 20.1797 ne he2s²2p⁶ neon ho…
\(10\)
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4) use the image to answer the question. how many protons does this ele…
\(10\)
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3) use the image to answer the question. what is the atomic mass?
20.1797
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2) use the image to answer the question. what is the atomic number?
\(10\)
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1) use the image to answer the question. what is the element symbol?
Ne
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9) type your answer below. why did mendeleev intentionally leave gaps i…
Mendeleev left gaps in his periodic table to account for and predict the existence of undiscovered elements based on the periodic trends of known elements.
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the epa also uses ppm or parts per million. 1 ppm is 1 gram of a substa…
Molarity - mols/Liter, ppm - mg/L, ppb - ug/L.
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7) choose the best answer. what zone would elements part of groups 3 th…
7. transition elements 8. periodic law
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it turns out that molarity isnt the only unit of concentration. in fact…
\(10^{9}\space mL\)
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5) choose the best answer. what made mendeleevs periodic table differen…
5) Elements were organized according to increasing atomic mass. 6) Dalton's atomic model.
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3) choose the best answer. what is a period? a row of elements a column…
3) a row of elements 4) a column of elements
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1) choose the best answer. what was a contribution from julius lothar m…
1. He arranged elements in periods using similar physical properties. 2. Dmitri Mendeleev
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6) fill in the table with the elements using the law of octaves. h li b…
First row: B Second row: Na, S Third row: Cl
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5) choose the best answer. what was the earliest form of a periodic tab…
telluric helix
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3) choose the best answer. which scientist created a standard for calcu…
3) Stanislao Cannizzaro 4) atomic number
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1) check the box if the statement describes the law of octaves or the l…
1. - "It was created by Johann Döbereiner during early developments of the periodic table": Law of Triads - "This theory did not work for group 2 elements": Law of Octaves - "The …
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lets say a sample was collected from a local water treatment plant. the…
\(0.000096\space M\); Yes
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13. choose all that apply. which three statements are properties of wat…
Water is clear, Water is polar, Water has poor thermal conductivity.
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11. choose the best answer. an element that gains or loses an electron …
11. ion 12. It is a molecule.
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9. choose the best answer. what is a substance made up of two or more d…
9. D. compound 10. B. atom
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now that you know how to calculate concentration, lets practice this sk…
\(4.6\)
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7. choose the best answer. what type of particle is found in the cloud …
7. electron 8. proton
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look at the cloud model of an atom. then, choose the best answers. 6. c…
6. B. neutron 7. A. electron
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3 choose the best answer. the snake is venomous and secretes a toxic, d…
3. chemical 4. physical
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now that you know that 50.5 grams of sucrose is equal to 0.147 moles of…
\(1.2\times 10^{2}\text{ M}\)
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1. drag and drop the scientists with the statements. proposed that matt…
Democritus; Dalton; Thomson; Rutherford
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16. choose the best answer. ____ developed an equation to better unders…
16. Schrödinger 17. ion
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look at the cloud model of an atom. then, choose the best answers. 12. …
12. proton 13. electron
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11. choose the best answer. an element that has a different number of n…
Isotope
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our goal is to measure the concentration of contaminants in the flint w…
The "LESS CONCENTRATED" solution has 5 particles and the "MORE CONCENTRATED" solution has 13 particles.
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10. choose the best answer. how many protons does oxygen have? oxygen 0…
8
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8. choose all that apply. choose three postulates of the bohr model of …
- **Question 8**: - Electrons in each orbit contain a specific amount of energy. - Electrons can only gain or lose energy by jumping to a higher or lower orbit. - Electrons can on…
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4. drag and drop the labels with the descriptions of an element. label …
Label 1: atomic number Label 2: element symbol Label 3: atomic mass
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10) choose the best answer. how many protons does carbon have? 6 12.010…
6
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fat/oil solubility of heroin using the information on hydrogen bonding …
Heroin
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exam : housekeeping procedures in residential care settings 1. which of…
1. Neutral pH cleaner 2. Find the nurse 3. Utility room with open windows
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9) drag and drop to label the element. 6 12.0107 c carbon choices atomi…
- Left - top dashed box: atomic number - Left - bottom dashed box: element symbol - Right dashed box: atomic mass
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take a close look at the three molecules below. which of the following …
Oxycodone, Morphine.
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8) drag and drop to label the atom. choices nucleus protons neutrons el…
Top - left label: nucleus; Middle - right label: protons and neutrons (protons are the green + ones, neutrons are the blue ones); Bottom - left label: electron cloud; Bottom - rig…
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7) choose the best answer. which subatomic particle has the smallest ma…
electrons
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6) drag and drop the correct answers to each blank. part of the atom lo…
First row (from left to right): proton, +1 Second row (from left to right): nucleus, 0 Third row (from left to right): -1
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4) choose the best answer. which of the following is an anion? ○ na+ ○ …
\(CN^{-}\)
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1) drag and drop the terms with the definitions. the total number of pr…
- "the total number of protons and neutrons found in the nucleus of an atom" → atomic mass number - "the number of protons found in an element" → atomic number - "an element that …
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based on the steps you used on the previous few screens, how would you …
Hydrogen bonding, Dipole - dipole, Induced dipole - induced dipole
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you said that dipole - dipole forces were most important to consider in…
CO (28.0 g/mol)
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which intermolecular force is the most important in determining the dif…
Dipole - dipole (not including hydrogen bonding)
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you said that london dispersion forces were the most important force fo…
\(I_2\) has the higher boiling point.
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which intermolecular force is the most important in determining the dif…
- The most important intermolecular force is London dispersion. - \(I_2\) has the stronger total intermolecular forces and the higher boiling point.
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checkpoint: imf strength 2 you said that hydrogen bonds were the most i…
$CH_{3}OH$ (32.0 g/mol)
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which intermolecular force is the most important in determining the dif…
Hydrogen bonding, because one of the molecules can hydrogen bond.
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your turn 1: which imf/bp is greater based on the guidelines to the rig…
Yes, and because of hydrogen bonding, \(CH_{3}NH_{2}\) has intermolecular forces that are stronger than \(CH_{3}-O - CH_{3}\)
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which imf influences bp most? substance so₂ cl₂ imfs ldf and dipole-dip…
Dipole - dipole
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which imfs are present? which imfs are present for the following substa…
- For \(SO_2\): London dispersion, Dipole - dipole. - For \(Cl_2\): London dispersion.
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substance br₂ nf₃ imfs ldf ldf and dipole - dipole molecular weight 159…
London dispersion
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which imfs are present for the substances below? select all that apply …
- \(Br_2\): London dispersion - \(NF_3\): London dispersion, Dipole - dipole
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the imfs you selected are shown below, along with the molecular weights…
\(Br - Br\)
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which imfs are present in the following molecules?br₂cl₂london dispersi…
- For \(Br_2\): London dispersion. - For \(Cl_2\): London dispersion.
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lets take stock of where we are now. the list to the right includes all…
Hydrogen Bonding (Strongest) → Dipole - Dipole Forces → Induced Dipole - Induced Dipole Forces (Weakest)