Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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substance #2 mass: 7.39 g volume of water: 30.5 ml volume of water and …
The density of substance #2 is approximately $0.754\ g/ml$
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question 10 of 10 which of the following elements is the largest? a. ca…
D. Boron (B)
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question 9 of 10 what makes the atomic radius change along a period in …
B. More protons in the nucleus pull the electrons in, making the atomic radius smaller.
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question 8 of 10 what does the electronegativity of an atom indicate? a…
A. The tendency of the atom to pull on electrons
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question 7 of 10 why do metals tend to lose electrons to form positive …
D. A metal atom loses its few valence electrons to form a full octet.
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question 6 of 10 what trend does the atomic radius follow along a perio…
C. The atomic radius gets smaller the farther right it appears on the periodic table.
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3. in what ways does the play address issues of race and identity? 4. w…
3. Analyze play's race - identity aspects. 4. Character revealing loyalty and reason. Section 4:1. Handkerchief's significance and Iago's use.
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question 5 of 10 what trend does the first ionization energy follow, go…
A. The first ionization energy decreases because the outermost electron is farther from the nucleus.
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question 2 of 10 what does the law of conservation of matter show? a. t…
B. That the total number of atoms in matter will never change.
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complete the sentences using the words provided. 1. a(n) (click to sele…
1. acid 2. base 3. buffer 4. increases 5. hydroxide (OH⁻) 6. negative logarithm 7. decreases
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question 4 of 10 which of the following elements shows little reactivit…
B. Argon (Ar)
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question 3 of 10 which of the following elements has the largest first …
D. Nitrogen (N)
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match each label with the correct location on the diagram. labels drop …
Hydrogen bond: The dashed - line between the hydrogen and oxygen atoms. Hydrogen atom: The small white spheres. An organic molecule: The larger molecule with multiple carbon - con…
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question 2 of 10 which of the following elements has the highest electr…
A. Nitrogen (N)
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what does a periodic trend look like on the periodic table? a. a set of…
D. A repeating pattern
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question 10 of 10 how many different sublevels are in the first energy …
C. 1
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which of the following phrases describes core electrons? a. electrons t…
C. Electrons that are closest to the nucleus
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how many different d orbitals are within the 3d sublevel? a. 3 b. 7 c. …
C. 5
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match each label with the correct location on the diagram. labels drop …
Hydrogen bond: The dotted - line between the partially charged atoms. Hydrogen atom: The small white spheres attached to carbon and oxygen. An organic molecule: The chain of grey …
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which is the only kind of orbital in the first energy level? a. an f or…
C. An s orbital
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how many total orbitals are within the 3s, 3p, and 3d sublevels of the …
C. 9
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which of the following phrases describes how the position of an electro…
A. The farther an electron is from the nucleus, the greater its energy.
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what does the period number tell about the energy levels occupied by el…
D. The period number tells which is the highest energy level occupied by the electrons.
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question 3 of 10 which of the following elements has 3 electrons in the…
B. N
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the fat molecule shown above containing three long tails are fatty acid…
London dispersion forces
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question 2 of 10 which of the following notations is the correct noble …
A. [Ar]4s²3d⁷
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what is the correct electron configuration of phosphorus (p)? a. 1s²2s²…
D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$
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for each statement below, indicate whether it is true or false. 1. brea…
1. False 2. False 3. True 4. True 5. True 6. False 7. False 8. True 9. False 10. True
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indicate whether each statement about the reactivity of elements is tru…
1. True 2. False 3. True 4. True 5. False 6. False 7. False
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2. find the mass of a sample of mercury (d = 13.5 g/ml) if the volume i…
134301.12 g
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the relatively weak ________ bonding between neighboring water molecule…
C. hydrogen
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question 10 of 32 how many protons are in chlorine (cl)? the periodic t…
B. 17
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question 9 of 32 how many electrons are in an ion of calcium (ca2+)? th…
A. 18
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question 8 of 32 what is the atomic mass of magnesium (mg)? the periodi…
A. 24.3
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question 36 of 36 which of the following is the energy of motion? a. ch…
A. Chemical potential energy
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this law was proposed by joseph proust and is known as the law of const…
1. D. law of definite proportions 2. B. proton
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choose the appropriate atomic number, mass, or property for each descri…
1. 4 2. 1 3. 7 4. 12 5. 27 6. 13 7. 30 8. 10
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question 6 of 32 which is the main type of element found in the upper r…
A. Nonmetals
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chemical reactions for each chemical reaction indicate whether the firs…
1. $NaOH ightarrow Na^+ + OH^-$: Base 2. $HCl ightarrow H^+ + Cl^-$: Acid 3. $NH_3 + H_2O ightarrow NH_4^+ + OH^-$: Base 4. $H_2CO_3 ightarrow H^+ + HCO_3^-$: Acid
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question 20 of 25 what was the atomic theory about? a. the existence of…
D. The structure of the atom
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question 5 of 32 which element has 6 valence electrons? the periodic ta…
A. Selenium (Se)
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question 19 of 25 an atom of aluminum (al) has an atomic number of 13 a…
D. 14
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question 18 of 25 why do elements within a period of the periodic table…
B. They have different numbers of valence electrons.
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question 16 of 25 what are the alkali metals? a. group 18 on the period…
C. The first group on the periodic table
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question 16 of 25 what are the alkali metals? a. group 18 on the period…
C. The first group on the periodic table
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question 15 of 25 which characteristic gives the most information about…
C. The atomic number
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the subatomic particle without an electric charge is called a(n) ____. …
1. A. neutron 2. No correct option provided (should be law of constant composition which is not listed as an option here)
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question 14 of 25 which element contains the same number of valence ele…
D. Si
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question 13 of 25 how are the elements arranged in the current periodic…
D. In order of increasing atomic number
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question 3 of 32 which type of element is almost always found as a sing…
C. Noble gas
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question 11 of 25 what is the symbol for potassium? a. p b. k c. pt d. …
B. K
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11. drag and drop the scientists with the statements. choices: crookes,…
1. Aristotle 2. Democritus, Leucippus 3. Aristotle 4. Dalton 5. Crookes 6. Rutherford 7. Thomson
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question 10 of 25 which family contains liquids, solids, and gases? a. …
B. The halogens
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question 9 of 25 what is another name for group 8a? a. group 18 b. grou…
A. Group 18
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question 2 of 32 what type of energy is stored in batteries? a. electri…
C. Chemical energy
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the condensation of water droplets on a glass of iced tea is an example…
C. phase change
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hands moving on a battery - operated clock is an example of what kind o…
B. Chemical potential energy being converted to kinetic energy
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question 1 of 32 which is a property of potassium (k)? a. it is not rea…
C. It is extremely reactive.
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the relatively weak ________ bonding between neighboring water molecule…
C. hydrogen
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question 4 of 25 thermal windows often have all the air pumped out betw…
A. Ar
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which subatomic particles interact in the chemical bonding between atom…
D. electrons
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question 2 of 25 which element is in the alkali - metal family? a. calc…
D. Lithium (Li)
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select the correct description of elements. all of these are correct. p…
particles that cannot be broken down into other substances
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8. choose all that apply. which five postulates were proposed by dalton…
- All matter is composed of extremely tiny particles called atoms. - Atoms cannot be created or destroyed (law of conservation of mass) nor can they be divided into smaller partic…
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question 1 of 25 rubidium (rb) has an atomic number of 37. it can lose …
A. 1+
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how have chemists affected our world for good? a. chemists have given u…
B. Chemists have improved our quality of life.
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7. choose the best answer. the center of an atom that contains protons …
C. nucleus
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an engineer chooses to use a natural adhesive for a building project in…
B. green design
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question 19 of 25 what did john dalton state in his atomic theory? a. a…
C. Matter is made up of atoms.
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look at the model. then, choose the best answers. 5. choose the best an…
5. B. John Dalton 6. The atom is not divided into any smaller or subatomic particles.
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look at the model. then, choose the best answers. 3. choose the best an…
3. Negative electrons float in a "soup" of positively charged material. 4. J. J. Thomson
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which of the following is an alkali metal? a. krypton (kr) b. lithium (…
B. Lithium (Li)
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how many valence electrons do the alkaline earth metals have? a. 6 b. 8…
D. 2
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question 8 of 10 which of the following would be more reactive than mag…
C. Potassium (K)
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which group has 1 valence electron? a. alkaline earth metals b. transit…
C. Alkali metals
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which of the following is a lanthanide? a. americium (am) b. barium (ba…
C. Europium (Eu)
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question 5 of 10 what is the maximum number of valence electrons an ele…
D. 8
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which of the following is a characteristic of the transition metals? a.…
A. They are malleable
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where are the noble gases located on the periodic table? a. the far lef…
D. The far right column
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question 8 of 25 what made alchemy unscientific in its practices? a. it…
A. It was not based on evidence and experiment.
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which of the following is a characteristic property of the noble gases?…
C. They do not react chemically.
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what is the name of the group 17 elements? a. alkaline earth metals b. …
D. Halogens
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question 10 of 10 nazi scientists frequently tested dangerous chemicals…
C. The Nazi government had dehumanized the Jews by constantly portraying them as subhuman animals.
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what is the periodic table? a. a method to name elements b. a tool to o…
B. A tool to organize the elements
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question 5 of 25 why does chemical safety remain a concern today? a. ch…
A. Chemists are constantly learning more about what makes chemicals dangerous., C. Chemists still have many older, existing chemicals that are dangerous.
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question 9 of 10 which elements occupy the same group in the periodic t…
B. Elements that share the same column
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question 8 of 10 what period is f (fluorine) in? a. 2 b. 17 c. 7b d. 7a
A. 2
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question 7 of 10 what are epresentative elements\? a. elements that sha…
D. Elements in the tall columns of the periodic table
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65. explain the octet rule. why are hydrogen and helium exceptions to t…
65. The octet rule is about 8 - electron outer - shell stability. Hydrogen and helium are exceptions due to their 1 - electron - shell nature and 2 - electron capacity. 66a. Negat…
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which of the following is an example of oxidation, a type of chemical w…
D. rust
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where are people exposed to chemicals? a. mostly outside b. mostly in p…
D. Everywhere
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question 9 of 10 where are chemicals found at work? a. only in carpets …
C. In every area of work
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question 8 of 10 what is a carcinogen? a. a chemical that improves the …
C. A chemical that causes cancer
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question 7 of 10 how do chemicals affect the environment? a. they only …
D. They can both hurt and help the environment.
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question 6 of 10 how does chemistry affect cancer? a. chemicals can bot…
A. Chemicals can both cause and fight cancer.
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question 5 of 10 how have chemists changed our daily lives the most? a.…
D. By using what they know to produce new and helpful products
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question 4 of 10 how does chemistry affect our world? a. chemicals make…
C. Chemicals can help or hurt our world.
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question 3 of 10 which of the following is an example of how research i…
D. Finding out that asbestos is dangerous and limiting its use in building materials
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question 2 of 10 which of the following is an example of how chemicals …
C. Chemicals can keep bread fresher longer.
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ch. 1, 2, 3 multiple choice & short answer test locked mode is on. to a…
3 ml