Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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question 22 (10 points) saved which of the following contains the fewes…
4.0g Rb
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chemist: zion singleton class: 4th date: 11/03/23 parts of a chemical e…
- Reactants: \(C_{6}H_{12}O_{6}\) and \(O_{2}\) - Products: \(CO_{2}\) and \(H_{2}O\) - Carbon atoms in sugar: \(6\) - Hydrogen atoms in water: \(2\) - Molecules of oxygen reacted…
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the molar solubility of lead(ii) phosphate (pb₃(po₄)₂) is 7.9×10⁻¹³m. c…
\(3.1\times 10^{-211}\)
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a sample of gas occupies 2.5 liters at a pressure of 1.2 atm and a temp…
\(1.42\)
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8. a gas mixture is prepared by combining 0.31 mol of methane, ( ch_{4}…
D. \(0.44\space atm\)
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soil profile a soil profile is a section of soil that ranges from the s…
vertical; parent material; horizon; organic matter
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consider the chemical equilibrium of the reaction. nh₄oh(aq) ⇌ nh₄⁺(aq)…
The chemical equilibrium will shift to the left.
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consider this equation in chemical equilibrium. h₂so₄(aq) ⇌ 2h⁺(aq) + s…
\(MgSO_{4}\)
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consider the reaction h₂(g) + i₂(g) ⇌ 2hi(g). what is the reaction quot…
613
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consider the chemical equation in equilibrium. 2h₂(g) + o₂(g) ⇌ 2h₂o(g)…
The forward reaction will be favored.
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according to le chateliers principle, a system in chemical equilibrium …
reduces the stress.
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consider this equation in chemical equilibrium. h₂so₄(aq) ⇌ 2h⁺ + so₄²-…
The chemical equilibrium will shift to the left.
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what is the cause of decubitus ulcers? multiple choice an allergenic ag…
Pressure on bony projections for a prolonged period of time cuts off the blood supply to an area of skin, and an ulcer forms.
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according to le chateliers principle, what happens to the equilibrium c…
The value of the equilibrium constant (\( K \)) remains the same.
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consider the reaction $\\ce{h_{2}(g) + i_{2}(g) \\leftrightarrow hi(g)}…
The equilibrium will shift to the left to favor the reactants.
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7. a 0.465 g sample of an unknown compound occupies 245 ml at 298 k and…
D. \(38.0\space g/mol\)
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which of the following is not a class of sedimentary rock?* volcanic ch…
1. volcanic 2. metamorphic rock 3. igneous rock
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most metamorphic rock forms as a result of * 2 points foliation magma f…
- First question: regional metamorphism - Second question: the rock cycle
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consider an isotope of carbon that has 7 neutrons. (6 pt) 2. write this…
a. \(\ce{^{13}_{6}C}\) b. carbon - 13
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this three dimensional version of the periodic table shows ionization e…
Halogens have high ionization energies. The energy required to remove a valence electron (to form a positive ion) is too large. Instead, they gain an electron (lower energy proces…
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consider an isotope of carbon that has 7 neutrons. (6 pts) a. write thi…
a. \(\ce{^{13}_{6}C}\) b. carbon - 13
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6. the density of chlorine gas, cl₂, at 1.21 atm and 34.9°c is ______ g…
E. 3.39 g/L
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question 1. read this sentence from paragraph 4. three days later, in t…
B. A fenced area with multiple buildings for housing people.
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5. a gas evolved during the fermentation of sugar was collected at 295.…
A. \(0.95\space mol\)
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a balloon filled with helium gas at 20°c occupies 2.91 l at 1.00 atm. t…
A. \(0.15L\)
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2. the following table shows the mohs hardness scale. it uses talc at 1…
C. New substances are formed.
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why are metals generally ductile, or able to be pulled into wires? vale…
Ions within the metal structure easily slide past one another.
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what is the role of an organic chemist in the study of carbon - based m…
To create new types of plastics. To study the structure and function of proteins, carbohydrates, DNA, or lipids.
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3. a fixed amount of gas at 25.0°c occupies a volume of 10.0 l when the…
B. 13.2 L
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2. to solve problems using boyles law, which mathematical equation shou…
B. \(P_1V_1 = P_2V_2\)
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1. the atmospheric pressure in denver, colorado is about 0.900 atm. thi…
D. \(684\space mm\space Hg\)
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question 7 (multiple choice worth 1 point) what property of water allow…
Low density as a solid
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q2 chemistry: u3l1 coulombs law teacher: date: prepwork part 1: coulomb…
5. quadruple 6. decrease to \(\frac{1}{16}\) of its original value 7. increase to 9 times its original value 8. decrease to \(\frac{1}{2}\) of its original value
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3. sulfur, which has the symbol s, is a solid at room temperature. it c…
Sulfur will react less vigorously than fluorine with iron wool.
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2. what powers the sun? the intense gravity of the sun crushes gas mole…
In the Sun’s interior, nuclear fusion occurs when hydrogen molecules are fused into helium. The byproduct of the process produces the energy that powers the Sun.
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1. what is the process of solar nuclear fusion? helium molecules are fu…
Hydrogen atoms are fused into deuterium, then helium - 3, then helium - 4, each step giving off large amounts of energy.
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question 7 why would an atom with 11 protons and 11 electrons be neutra…
The number of protons and electrons cancel each other out.
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question 5 which analogy best describes how electrons behave in an atom…
7
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which analogy best describes how electrons behave in an atom? people st…
7
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2. the valence electrons in atoms are shielded from the attractive pull…
Yes, the reactivity of halogens relates to the shielding effect. As we go down the halogen group (F, Cl, Br, I), the number of electron shells (and thus the shielding effect) incr…
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question 3 what determines the identity of an element? the size of the …
For Question 3: The number of protons. For Question 4: They are always in motion due to their charge and energy.
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where are protons and neutrons located in an atom? attached to the elec…
In the nucleus
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we have investigated the question, if atoms make up all of the matter a…
Protons, neutrons, and electrons.
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you are developing a model to predict the decay of a rare chemical subs…
- Part A: The equation is \(80 = 250e^{-\lambda t}\), and \(t=\ln(\frac{25}{8})\approx1.15\) (assuming \(\lambda = 1\)). - Part B: Logarithms are the inverse of exponentials, allo…
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what innovation helps archaeologists determine the age of objects? oral…
Carbon dating
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2. what role do animals, plants, bacteria, and fungi play in soil forma…
Plants add organic matter (leaves, roots). Animals mix soil and add waste. Bacteria decompose. Fungi break down complex materials.
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what element is represented in this bohr model? lithium aluminum hydrog…
Lithium
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ionization energy 2. choose the atom from each of the following pairs w…
a. Be b. Ar c. Cl
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ionization energy 1. what factors can change the attractive force betwe…
Nuclear charge (number of protons), electron shielding (by inner - shell electrons), and the distance of valence electrons from the nucleus (atomic radius).
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the colors and sounds in fireworks come from changes in n what is one e…
Fireworks.
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read the excerpt from act 1, scene 7 of the tragedy of macbeth. macbeth…
By reasonably weighing the opportunities and obstacles, she shows that her assassination scheme is sensible.
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20. which of the following is true about compounds? they can be physica…
They are substances.
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19. which is an example of a chemical change? water boiling a cake baki…
a cake baking
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18. which of the following is a homogeneous mixture? salt water beef st…
salt water
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17. in the chemical reaction in which sucrose is heated and decomposes …
sucrose
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figure 18.1 use the diagram above to answer the following questions. id…
A. Option Text
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16. a vapor is which state of matter? solid gas liquid all of the above
gas
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15. which of the following indicates that a chemical change has happene…
The food darkens.
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14. which is not a property of a pure substance? uniform composition fi…
varying composition
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multiple - choice question why does electronegativity decrease as you m…
increasing shells lower the attraction of the outermost electron to the nucleus
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exercise 1 classifying nouns classify each noun below by writing comm f…
## Exercise 1: 1. COMM 2. COMM 3. PROP 4. COMM 5. PROP 6. PROP 7. COMM 8. COMM 9. COMM; COMP 10. COMM 11. PROP 12. COMM 13. COMM; COLL 14. PROP 15. COMM 16. COMM 17. COMM 18. COMM…
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write the orbital notation for the following elements: fluorine (f) ele…
Symbol: \(F\); Number of Electrons: \(9\); Orbital Notation: \(1s^{2}2s^{2}2p^{5}\)
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iodine and potassium form an ionic bond. iodine has seven electrons in …
Iodine becomes an ion with a negative 1 charge.
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what is formed when polyatomic ions bond with other ions? ionic compoun…
ionic compounds
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which is an example of a polyatomic ion? h₂ co₃ mg⁺ ne⁺
\(CO_3\) (assuming it is \(CO_3^{2 -}\)) is the example of a polyatomic ion.
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which atom is most likely to accept electrons to form an ionic bond? a …
sulfur, a nonmetal with 6 valence electrons
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which shows the correct order of steps during the formation of an ionic…
Electrons are transferred → Ions form → Ions are attracted to each other
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david observed properties of four different compounds, only one of whic…
Z
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chalk is an ionic compound. which is a property of all ionic compounds …
hardness and brittleness
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what will most likely occur if sulfur forms an ionic bond with another …
Sulfur will accept electrons.
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this chart shows characteristics of three different types of atoms. whi…
Atom X will accept electrons from Atom Y.
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which characteristic(s) makes ionic compounds useful as a building mate…
hardness and brittleness
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peter performed an experiment to test which of the three compounds his …
B
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which of these ionic compounds have polyatomic ions? check all that app…
A. \(CaCO_3\), E. \(NaOH\)
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read the excerpt from a speech on the benefits of eating organic versus…
"chemicals", "disease", "obesity"
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consider these atoms. which atom (ba or i) would accept electrons from …
I
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put the steps in order to show how crystals are formed. formation of io…
1. Formation of ions 2. Formation of ionic bonds 3. Formation of cubes (as a result of the regular arrangement of ions in the crystal - this is part of the crystal formation proce…
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complete the passage. k (potassium) belongs to group ia of the periodic…
7
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identifying atoms that form ionic bonds which of these pairs would form…
K and Br
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question 16 1 pts neutrophils are highly mobile and phagocytic. they mi…
- Question 16: diapedesis - Question 17: aortic baroreceptors and carotid baroreceptors - Question 18: erythropoietin
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question 1 in the extrinsic pathway of stage 1 of the clotting mechanis…
- Question 1: prothrombin activator - Question 2: perfusion pressure - Question 3: vagal inhibition
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question 9 in the sentence this is the classroom where my chemistry lab…
d. subject
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give the correct definition for the following changes in state of matte…
1. Condensation 2. Melting 3. Freezing 4. Vaporization
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the graph below shows a substance changing state as the temperature dro…
1. A 2. C 3. E 4. B 5. 120°C 6. D 7. 20°C
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18. the compound n₂o is called --choose the correct answer-- clear all …
Nitrous oxide
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which statement best compares a battery and a galvanic cell? (1 point) …
A battery’s source of power is a galvanic cell in which a redox reaction produces electrical energy.
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which action occurs at an electrode of a galvanic cell? (1 point) anion…
electron transfer
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use the chemical equation to answer the question. br₂(l)+2nai(aq)→i₂(s)…
Iodine (I) is oxidized, and bromine (Br) is reduced.
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which statement correctly describes the oxidation number of the mangane…
Manganese has an oxidation number of \(+2\) in \(MnI_{2}\) and \(+4\) in \(MnO_{2}\).
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which chemical equation represents a redox reaction? (1 point) ○ ticl₄(…
\(Fe_{2}O_{3}(s)+2Al(s)\to Al_{2}O_{3}(s)+2Fe(l)\)
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which statement describes the process of oxidation? (1 point) oxidation…
Oxidation results in a loss of electrons, so the oxidation number increases.
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which phrase best defines a redox reaction? (1 point) a reaction in whi…
a reaction in which electrons are transferred between different atoms
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use the reaction to answer the question. which type of reaction is show…
combustion
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hydrogen and nitrogen combine to form ammonia. when nitrogen and hydrog…
Hydrogen is oxidized, and nitrogen is reduced.
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which statement best explains why magnesium and chlorine combine in a 1…
Magnesium has two valence electrons, and chlorine can accept one electron in its outer shell.
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read all procedures thoroughly before entering the laboratory. * true f…
1. True 2. True 3. False
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laboratory work can be started immediately upon entering the laboratory…
1. B. False 2. A. True 3. B. False
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return all unused chemicals to their original containers. * true false …
1. B. False 2. A. True 3. B. False
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hot glass looks the same as cold glass. * true false all chemicals in t…
- First question: A. True - Second question: A. True
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you want to place a piece of glass tubing into a rubber stopper after t…
For the first question: All of the above. For the second question: None of the above.