Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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11) in a chemical reaction occurring in a beaker, the beaker and its co…
11. a) True 12. b) System 13. a) True 14. b) The mass of the liquid
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most substances that are not metals look dull. why? they are not ductil…
They lack luster.
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1) an atom is the smallest unit of an element that retains the chemical…
1. a) True 2. c) Oxygen ($O_2$) 3. b) False 4. c) Salt (NaCl) 5. b) False
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if the molecular species has a charge, this must be taken into account …
electrons, electrons
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to complete the lewis structure, electrons are rearranged to make ____ …
Question 18: multiple bonds Question 19: valence electrons
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the valence electrons remaining after the initial bonds are formed are …
Question 16: True Question 17: C. electrons, electrons
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question 14 once we know the number of valence electrons, the atoms are…
Question 14: C. electronegative Question 15: D. covalent bond
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for simple molecules we can write the lewis structures by simply pairin…
1. True 2. valence electrons
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the number of electrons needed to reach an octet determines the number …
- one pair of electrons: single bond - two pair of electrons: double bond - three pair of electrons: triple bond - Question 11: B. double bond
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question 9 the main group nonmetals generally follow the octet rule whe…
transition and inner transition
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main group atoms tend to form bonds such that the bonded atoms have a t…
Question 1: D. octet Question 2: A. True
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question 5 when two diatomic atoms such as chlorine atoms form a diatom…
Question 5: B. share one pair Question 6: A. single bond
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lewis symbols can be used to show the______of electrons during the form…
Question 1: B. transfer Question 2: D. covalent bonds
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the dots for an elements lewis symbol signify the number of ____ presen…
1. valence electrons 2. electrons
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question 23 1 p select the pair of atoms that forms the least polar cov…
B. C-C
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question 21 1 pts a bond where the electrons are shared unequally is ca…
Question 21: C. polar covalent Question 22: D. Si - Cl
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which element listed is the least electronegative? boron chlorine nitro…
1. A. boron 2. C. 8
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question 18 1 pts in which of the following compounds are atoms held to…
B. $NCl_3$ C. $C_6H_{12}O_6$ D. $H_2O$ E. $PCl_3$
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in which of the following compounds are atoms held together by covalent…
B. $NO_2$ C. $C_6H_{12}O_6$ D. $H_2O$ E. $PCl_5$
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in which of the following compounds are atoms held together by ionic bo…
B. $Ag_2O$, C. NaCl, G. $Mg_3N_2$, H. FeS
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what is the formula for the ionic compound composed of aluminum cations…
Question 15: C. $Al_{2}(SO_{4})_{3}$ Question 16: C. $Sn^{4+}$
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question 13 a compound contains an unknown ion x and has the formula xo…
Question 13: D. $Pb^{4+}$ Question 14: B. $SO_3^{2 - }$, C. $NO_3^{-}$, D. $CO_3^{2 - }$, E. $SO_4^{2 - }$, F. $PO_4^{3 - }$
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what must the charge be on the copper ion when it exists as an ionic co…
Question 1: D. 2+ Question 2: C. 2+
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the ion formed by magnesium combines with the ion formed by sulfur in a…
First question: A. 1:1 Second question: E. $Al_{2}O_{3}$
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what is the ratio of aluminum cations to chloride anions in a sample of…
Question 1: B. 1:3 Question 2: A. 14
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the electron configuration for zinc is ____________, while that of the …
1. [Ar]3d$^{10}$4s$^{2}$, [Ar]3d$^{10}$ 2. the simplest whole number ratio of elements present in the substance
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an element with the following electron configuration will gain ________…
1. D. 3 2. C. \([Ar]4s^{2}3d^{10}4p^{6}\), krypton
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when a ca metal atom loses both of its valence electrons it attains an …
Question 1: the noble gas Ar Question 2: selenium
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question 19 as the electronegativity difference increases between two n…
Question 19: D. ionic Question 20: A. polyatomic ions
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question 17 1 pts when two covalently bonded atoms have the same or sim…
Question 17: evenly, nonpolar Question 18: unevenly, polar
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electrons in a polar covalent bond are shifted toward the least electro…
False D. increases, decreases
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question 13 1 pts in the case of a polar covalent bond, the atom with a…
Question 13: B. partial positive charge Question 14: B. Electronegativity
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a _______________ is formed when bonding electrons are attracted to one…
First question: D. polar covalent bond Second question: C. partial negative charge
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when two nonmetal atoms such as chlorine share electrons to form a cova…
1. B. eight 2. B. False
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a chemical bond is simply the internuclear distance at which the______ …
1. D. lowest potential energy 2. A. True
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the distance between two atoms at which the lowest potential energy is …
- First question: B. bond length - Second question: C. electrons
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molecular compounds that contain covalent bonds exhibit different prope…
For the first question: lower melting points, may be liquids or gases, generally softer. For the second question: False
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ionic bonding results from the electrostatic attraction of_ oppositely …
1. A. oppositely charged ions 2. C. sharing
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when main group metals form cations, they tend to lose all of the _____…
1. B. valence 2. B. the outer s and p orbitals
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ionic compounds do not exist as discreet units of a single pair of ions…
Question 1: B. three - dimensional lattice structure Question 2: B. strong electrostatic attraction
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the formula of an ionic compound is given as the__________the number of…
1. C. simplest ratio of 2. B. False
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a is made up of two elements where one is a metal and the other a nonme…
1. D. binary ionic compound 2. True
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the properties of ions are very different from the neutral atoms from w…
1. True 2. C. sodium chloride (table salt)
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ionic bonds are the consequence of electrostatic forces between atoms w…
Question 1: C. oppositely charged cations and anions Question 6: - rigid and brittle - high melting and boiling points - a crystalline structure - dissolve readily in water
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when a neutral atom gains one or more electrons from its valence shell …
1. B. an anion 2. D. salts
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question 1 1 pts ions are atoms or molecules bearing an odd number of n…
Question 1: an positive or negative charge Question 2: valence shell
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isotopes of the same element are different from one another in that mul…
They have a different number of neutrons.
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you can painlessly wade into a pool, but doing a belly flop off of the …
water's higher density compared to the air.
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given the data in exercise 115, calculate the energy that must be remov…
\(-151.25\ kJ\)
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given the data in exercise 115, calculate the energy that must be remov…
If the molar - mass of \(X\) is known, substitute into \(Q=\frac{250}{M}\times75.0\ kJ\) to get the energy value. For example, if \(M = 50\ g/mol\), the answer is \(375\ kJ\)
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which element is present in all amino acids, but not necessarily in fat…
C. nitrogen
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which atoms are in all carbohydrates? carbon, hydrogen, oxygen carbon, …
carbon, hydrogen, oxygen
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which phrase names a direct result of hydrogen bonding? the polar ends …
cohesion and adhesion
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which property of water is likely the most significant in water’s role …
Water molecules have positive and negative sides.
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atoms of which three elements could bond together to form an organic co…
D. carbon, hydrogen, and oxygen
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the dots in each diagram represent valence electrons orbiting the nucle…
(Assuming the diagram with 4 dots is one of the options, without seeing the actual dot - counts in each diagram we can't precisely pick the letter, but the correct answer is the d…
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why is carbon present in so many types of molecules? it can become an i…
It can form up to four covalent bonds.
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how are hydrogen bonds different from covalent bonds? o they have valen…
Hydrogen bonds are weaker bonds that form from molecules that have a slight positive charge on one side and a slight negative charge on the other.
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why can a carbon atom can form a variety of compounds? o it has 2 valen…
It has 4 valence electrons that allows it to bond with up to 4 other atoms.
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how is an organic compound different from an inorganic compound? inorga…
Organic compounds contain carbon atoms bonded to other atoms.
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according to the concept of entropy, what will likely happen to most mo…
They will break down.
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which type of bond holds atoms together in a water molecule? nuclear bo…
D. covalent bond
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what element do all organic compounds have? oxygen phosphorus nitrogen …
D. carbon
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what is the most important role of hydrogen bonding between water molec…
It enables water molecules to bond to each other.
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which statement is true about water molecules? water molecules move ran…
The oxygen atom has a slight negative charge.
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william bradford 1621 a certain indian came boldly amongst them and spo…
C. saw examples of divine providence in everyday life.
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william bradford, 1621. a certain indian came boldly amongst them and s…
B. Native Americans formed complex communities capable of developing alliances for their own self - interest.
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which statement describes carbons unique bonding ability? carbon can ea…
Carbon can easily form 4 covalent bonds with other atoms.
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which molecules are considered organic? o those containing phosphorus o…
those containing carbon
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william bradford 1621 a certain indian came boldly amongst them and spo…
A. The interaction between English colonial settlers and Native Americans in the early 17th century.
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question 35 2.5 points save answer read the following scenario and answ…
eutrophication
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if energy cannot be destroyed, why do some people worry about the energ…
The concern is with usable sources of energy.
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identify the element and determine the valence electrons. | electron co…
| Electron Configuration | Element Symbol | Valence Electrons | | ---- | ---- | ---- | | $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{1}$ | Rb | 1 | | $1s^{2}2s^{2}2p^{6}…
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13.kr 5s² 4d¹⁰5p³ explain what is wrong with the following electron con…
13. Incorrect sub - shell filling order. 14. 4d filled before 5s contrary to Aufbau principle. 15. 3s sub - shell has more than maximum 2 electrons.
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9. radium 10.iodine determine what elements are denoted by the followin…
11. Element: S 12. Element: Rb 13. Element: Sb 14. Error: Incorrect orbital - filling order, should fill $3d$ before $4d$. 15. Error: $3s$ sub - shell cannot have 3 electrons. For…
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electronic configuration practice- use periodic table with electron con…
1. $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. $1s^{2}2s^{2}2p^{6}3s^{2}$ 3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$ 5. $1s^{2}2s^{2}2p^{6}3s^{2}3…
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name ______________ period ______________ history of atomic theory fill…
| Name of Researcher | Equipment/Experiment | Sketch of Model | Major Idea/Discovery | | ---- | ---- | ---- | ---- | | Dalton | N/A | N/A | All atoms of a given element are identi…
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fill in the missing information in the chart below: name of researcher …
| Name of Researcher | Equipment/Experiment | Sketch of Model | Major Idea/Discovery | | ---- | ---- | ---- | ---- | | Dalton | N/A | N/A | All atoms of a given element are identi…
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the rate of a chemical reaction varies, depending on the initial amount…
7
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choose the correct electron configuration for chlorine (cl). 1s² 2s² 2p…
1s² 2s² 2p⁶ 3s² 3p⁵
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the last 6 columns on the periodic table corresponds to which sublevel …
A. the p sublevel
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compute the average atomic mass for silicon: isotope percent abundance …
28.09
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which of the following could have 82 neutrons? w-182 cs-132 ba-138 ta-1…
Ba - 138
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choose the correct electron configuration for beryllium (be). 1s² 2s² 2…
1s² 2s²
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which energy change takes place when gasoline evaporates from a fuel ga…
Energy is absorbed.
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atom 1 has mass=12 protons=6 atom 2 has mass= 14 electrons=6 are these …
C. Isotopes of Carbon
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the molar heat of fusion of gold is 12.550 kj mol⁻¹. at its melting poi…
$3,688.3\ g$
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an ice cube is dropped into a glass of milk at 20°c. which statement ex…
Because milk has higher KE than ice, KE is transferred from the milk to the molecules of ice.
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the overall change in enthalpy of a reaction depends only on the reacta…
the reactants and the products.
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which statement describes mechanical energy? the energy that is associa…
the sum of the kinetic energy and the potential energy of an object
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which statement describes mechanical energy? the energy that is associa…
the sum of the kinetic energy and the potential energy of an object
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* if two or more atoms of the same element dont satisfy the octet rule,…
Yes.
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proposed lewis structure is the proposed lewis structure reasonable? ye…
1. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: C 2. Yes. 3. Yes.
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arrange the highlighted bonds in the table below in decreasing order of…
H—F: 1 H—Cl: 2 H—I: 3
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complete the table below by writing the symbols for the cation and anio…
| ionic compound | cation | anion | | ---- | ---- | ---- | | MnS | $Mn^{2 + }$ | $S^{2-}$ | | $NH_{4}Br$ | $NH_{4}^{+}$ | $Br^{-}$ | | $Fe(NO_{3})_{3}$ | $Fe^{3+}$ | $NO_{3}^{-}$ …
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level 1 q1 which of the following chemical formulas represents the nitr…
Q1: A. $N_2$ Q3: B. Nitrates
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carbon reacts with oxygen to produce carbon dioxide co₂(g), δhf = -393.…
-393.5 kJ
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propane c₃h₈ (g), δh_f = 103.8 kj/mol reacts with oxygen to produce car…
$-2,044.0$ kJ/mol
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question 13 use the figure above to answer the following question(s). a…
tenfold increase in
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according to hesss law, if a series of intermediate reactions are combi…
the sum of the enthalpy changes of the intermediate reactions.