化学
化学反応、化学量論、分子構造、元素の性質。
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valence electrons and dot diagrams 1 how many valance electron do each …
1. I. \(1\) II. \(5\) III. \(6\) IV. \(5\) V. \(4\) VI. \(1\) VII. \(6\) VIII. \(3\) IX. \(2\) X. \(2\) XI. \(6\) XII. \(1\) 2. Dot Diagrams represent the number of **valence elec…
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18 elección múltiple 1 punto an atom of ti has a charge of +2. which of…
Ti lost 2 electrons ### Question 19
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text chunk 3: write the main ideas in your own words or images. (if you…
Subatomic particles (electrons, protons, neutrons) have different charges and masses. Protons and neutrons are in the nucleus, electrons can move. Our understanding of atomic stru…
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rutherford and gold foil j.j. thomson made an important discovery about…
Rutherford's gold - foil experiment: Positive particles shot at gold foil. Most passed (atom mostly empty). Some deflected (nucleus with positive charge - protons). Later, neutron…
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a color scheme using three colors evenly spaced around the color wheel …
A. Triadic
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a color scheme using four colors that form two sets of complementary co…
Tetradic (or double - complementary) color scheme.
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the color scheme that involves three colors evenly spaced around the co…
1. triadic 2. split - complementary 3. tint 4. shade
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states that every orbital in a subshell must be occupied by one electro…
Hund's rule
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structure of matter read and annotate the article below early ideas of …
The main idea is that throughout history, people have wondered about the composition of matter. Early concepts included atoms (from Democritus), and in the 18th century, scientist…
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which of the following is not something that the kmt explains about mat…
B. particle color
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chemical changes result in the formation of a new substance. true false
True
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the states that no two electrons can have the same 4 quantum numbers, t…
Pauli Exclusion Principle
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question 18 of 20 points: 2 a steak being seared in a skillet causes a …
B. chemical change
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question 15 of 20 points: 2 phosphorous dissolving in carbon disulfide …
A. physical change
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question 14 of 20 points: 2 which of the following is not a type of sol…
A. ideal
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10. how many sublevels are contained in each of these principal energy …
10. a. \(1\) b. \(2\) c. \(3\) d. \(4\) 11. a. \(3\) b. \(1\) c. \(7\) d. \(5\) e. \(1\) f. \(3\) 12. Bohr model: electrons in fixed circular orbits. Quantum mechanical model: ele…
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question 13 of 20 points: 1 physical properties are observable. true fa…
True
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question 12 of 20 points: 5 which model shows a chemical change taking …
- Model A shows a chemical change because new types of molecules (with different compositions) are formed. - Model B shows a physical change because the type of molecules remains …
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question 9 of 20 points: 2 sodium melting at 882.8 c is an example of a…
B. physical change
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magnesium oxide the diagram shows the reaction between magnesium (mg) a…
14. The pair of atoms in Part B are ions. 15. In a diagram of a covalent bond, atoms would share electrons rather than one atom transferring electrons to another.
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question 8 of 20 points: 2 coal burning in a steam engine is an example…
A. chemical change
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matter: physical and chemical madelynn sharbonno question 7 of 20 point…
A. True
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which example shows a chemical change? vinegar reacting with baking sod…
Vinegar reacting with baking soda
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which of the following pairs of elements have the most properties in co…
B. Fluorine and chlorine
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which of the following shows a physical change taking place? a banana t…
Tearing a piece of aluminum foil into small strips
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multiple choice 1 point which situation describes a chemical change? mi…
B. Leaves changing color in the fall
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matter: physical and chemical madelynn sharbonro question 5 of 20 point…
True
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3. the number of electrons in one beryllium atom is a. 9 b. 5 c. 4 d. 2…
B. \(4\)
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question 4 of 20 points: 5 match the following with the correct categor…
- boiling point: physical property - luster (aka - shine): physical property - brittle: physical property - explosive: chemical property - corrosive: chemical property
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physical changes alter a substance without changing what the substance …
True
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during a laboratory experiment, four students each combined two substan…
B. Student 2
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if only the appearance, size, or state of matter changes - but not the …
Physical change
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question 2 of 20 points: 1 physical properties are measurable. ex: mass…
True
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question 1 of 20 points: 2 the formation of acid rain makes the rain co…
B. chemical property
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from their positions in the periodic table, arrange the atoms in each o…
\(As < H < C < N < Sb\)
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which of the following rows identifies both the elements and the total …
C. Carbon, hydrogen, and oxygen; \(8\)
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use what you learned from the readings to answer the question on the ri…
\(BH_4^{-}\), \(NO_3^{-}\)
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use what you learned from the readings to answer the question on the ri…
\(NO_3^-\)
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a student reads the following four unrelated observations in her scienc…
C. Observation 3
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use what you learned from the readings to answer the question on the ri…
\(1-\) \(2+\) \(1+\)
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numerical response 1. listed in order from the least reactive metal to …
4132
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electronegativity all of the following molecules are polar covalent. be…
Slight Positive Charge: \(C\) in \(C - O\), \(H\) in \(H - Cl\) Slight Negative Charge: \(O\) in \(H_2O\), \(F\) in \(H - F\)
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1. given: d_{actinium}=10.1g/cm^{3},1.2g wanted: volume of actinium in …
1. \(0.12\ cm^{3}\) 2. \(8.75\ g/cm^{3}\) 3. \(2.135\ cm^{3}\) 4. \(0.0037\ g/mL\) 5. \(1.4\ cm^{3}\) 6. \(9.32\ g/cm^{3}\) 7. \(1.82\ g/cm^{3}\) 8. \(2.24\ cm^{3}\)
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most main - group elements form a single ion with a predictable positiv…
- Elements will gain or lose electrons to have a full valence shell of electrons. - Elements will always gain the electrons needed to have as many electrons as the closest noble g…
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all densities are at 298 k (25°c) unless otherwise noted. you can enter…
1. \(0.3431\) g 2. \(1.2033\) \(cm^{3}\) 3. \(5.2027\) \(g/cm^{3}\) 4. \(3.3674\) g 5. \(0.514488\) g 6. \(12.4\) \(g/cm^{3}\) 7. \(3.009\) g 8. \(2.1\) g
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ionic charge match each element to the charge of the ion it most common…
- sulfur: \(2 -\) - iodine: \(1 -\) - boron: \(3+\) - calcium: \(2+\) - potassium: \(1+\)
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making models sodium chloride (table salt) and vanillin (the main compo…
Sodium chloride is an ionic compound with strong ionic bonds (high melting/boiling points, good conductivity when ions are free). Vanillin is a molecular compound with weak interm…
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question 19 (5 points) which of the following is an example of a physic…
- Question 19: d. boiling point - Question 20: b. law on conservation of mass; stays the same
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question 18 (5 points) what happens when gas is compressed by pressure?…
Question 18: A. particles move closer together Question 19: D. boiling point
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question 15 (5 points) conductivity true false question 16 (5 points) t…
Question 16: B. False Question 17: B. physical
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question 12 (5 points) changes from melting and freezing are chemical c…
- Question 12: False - Question 13: a. gas, b. liquid, d. solid
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question 12 (5 points) changes from melting and freezing are chemical c…
False # Question 13
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we know that ionic compounds have an overall neutral charge. we can als…
\(\text{Mg}_2\text{Cl}\), \(\text{PCl}_2\), \(\text{SrCl}\)
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how many days do you have out of school in the moth of november before …
Question 10: C. none of the above Question 11: False
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lets pause for a moment and take a second to practice predicting the pr…
D. A \(Ca^{+2}\) ion and two \(Cl^{-1}\) ions, E. A calcium cation and two chloride anions, G. A \(CaCl_{2}\) compound
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2. t/f chemicals can be broken down and/or linked together to form new …
T (True)
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match the following atoms to the statement that best describes how they…
- Copper: Can form multiple ions - Phosphorus: Forms a 3 - ion - Iodine: Reacts to attain the same number of electrons as xenon - Rubidium: Forms a cation with a 1+ charge - Magne…
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question 5 (5 points) gas bubbles forming after mixing 2 liquids shows …
True # Question 6
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question 1 (5 points) reactivity is the ability of a substance to allow…
Question 1: B. False Question 2: B. a chemical change has occurs because new substances formed
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balancing act name atoms are not or during a chemical reaction. scienti…
\(2H_2O_2 ightarrow 2H_2O + 1O_2\)
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(b) what is the average abundance of oxygen in nature?
# Explicaciones breves: La abundancia promedio del oxígeno en la naturaleza se refiere a la proporción relativa del oxígeno en la Tierra. El oxígeno es uno de los elementos más ab…
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9. define “isotope” using mass number, atomic number, number of protons…
Isótopos son átomos del mismo elemento (mismo número atómico, es decir, misma cantidad de protones y, en átomos neutros, misma cantidad de electrones) que difieren en el número de…
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balancing act name atoms are not ______ or ______ during a chemical rea…
For \(Ca + O_2 ightarrow CaO\): \(Ca\) (left) \(=2\), \(Ca\) (right) \(=2\), \(O\) (left) \(=2\), \(O\) (right) \(=2\). For \(N_2 + H_2 ightarrow NH_3\): \(N\) (left) \(=2\), \(N\…
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1. what must be included in the hospice and facility portions of the co…
1. Whether the hospice or facility is responsible for each problem 2. Palliative care 3. RN
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olive oil producers want to sell more olive oil at a higher price. whic…
- First question: research finds that consumption of olive oil reduces the risk of heart disease. - Second question: Both the supply and demand curves have shifted to the right. A…
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which of the following is not considered a factor in soil formation? cl…
Chemical weathering, carbonation. Warm - wet climate provides more water and higher temperatures (increase reaction rate) for the chemical reaction.
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which of the following is not considered a factor in soil formation? cl…
Chemical weathering, carbonation. Warm wet climate provides more moisture and energy for faster reactions.
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a river speeds up on a steep slope. predict what happens to erosion and…
- First question: Erosion increases and deposition decreases. The river has more kinetic energy (from speeding up) to erode, and less energy to deposit. - Second question: Hot, we…
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ela buzz the phrase \flower language\ might sound silly or farfetched, …
- Literary Device: b. hyperbole (because it exaggerates the number of flower meanings). - Three Things Flowers Talk About: health, threats, growing conditions. - Punctuated Senten…
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a river speeds up on a steep slope. predict what happens to erosion and…
- First question: Erosion increases, deposition decreases. Faster - moving water has more energy to erode and less to deposit. - Second question: Hot, wet climate. - Third questio…
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label a soil profile from top to bottom using a, b, c, and bedrock and …
- Second question: B. Mechanical weathering - Third question: C. C horizon
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what is the primary difference between weathering and erosion? weatheri…
1. Weathering breaks down rock in place while erosion transports material. 2. Erosion 3. Wind
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nom : quiz formatif sur toute la nomenclature (version b) /20 points 1.…
a) Génoxyde b) Alumine c) Acide phosphorique d) Nitrite de fer (II) e) Hydrure de magnésium f) Acide phosphorhydrique
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californias silicon valley; seattle, washington; and austin, texas; are…
10. b. Smog 11. c. jazz 12. b. by bringing fresh water from far away 13. c. Over centuries, immigrants have arrived from many different countries.
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the molecules on the left represent $ch_4$ and $o_2$. combustion of met…
A. Yes, because atoms are the same in the reactants and products.
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a piece of dry ice (solid co₂) was placed inside a balloon and the ball…
B. The balloon will be \(20.00\) g, because the solid has changed to a gas but has not escaped the balloon.
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solutions of potassium iodide (ki) and lead nitrate pb(no₃)₂ are combin…
A. \(KNO_3\); two molecules
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water chemical reaction hydrogen gas (h₂) oxygen gas (o₂) water (h₂o) w…
C. The reactants have four hydrogen atoms and two oxygen atoms, and the products have the same atoms in two molecules of \(H_2O\)
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what describes a chemical equation? oa it is a representation of a chem…
A. It is a representation of a chemical reaction.
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sara made a mistake while balancing the following chemical equation: $m…
B. The number of atoms of the element oxygen in the reactants and products of the equation is not the same.
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if each purple sphere represents an atom of copper (cu), and each red s…
B. \(2Cu + O_2 ightarrow2CuO\)
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na₂s + 2hcl → 2nacl + h₂s 55g 15g 67g? what is missing from the equatio…
B. Three grams of \(H_2S\) because the mass of the products must equal the mass of the reactants.
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what happens to the mass of substances during a chemical reaction? oa m…
C. Mass is not gained or lost.
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which model accurately represents the chemical equation 2h₂ + o₂ → 2h₂o…
B. Option B shows 2 \(H_2\) molecules (each with 2 small circles), 1 \(O_2\) molecule (with 2 large circles) as reactants and 2 \(H_2O\) molecules (each with 2 small circles and 1…
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study check identify the oxidizing agent and reducing agent in each of …
a) Oxidizing agent: \(O_2\); Reducing agent: \(H_2\) b) Oxidizing agent: \(HNO_3\); Reducing agent: \(Cu\)
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which is an example of a physical property? viscosity boiling point mas…
D. All of these
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mass and volume depend on the amount of matter present. this means that…
extensive properties.
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based on the positions of the atoms in the periodic table, arrange the …
1. \(H - F\)
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which of the following are extensive properties? length density freezin…
Length.
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which of the following are intensive properties? boiling point viscosit…
C. All of these
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when you observe a chemical property, the substance... goes through a p…
changes to a new substance.
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cohesion is the ability of water molecules to stick to... each other. m…
each other.
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types of energy what type of energy does a moving baseball have? chemic…
Kinetic energy
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which is an example of a chemical property? reactivity with water freez…
Reactivity with water
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after a covalent bond has stabilized an atom, the atom will have fewer …
a full valence electron shell
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which best describes most covalent compounds? warm cold brittle resilie…
brittle
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a candles wick is the fabric string that holds the flame, and it burns …
a low melting point
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which is most likely a covalent compound? cf₄ cuf₂ kcl nacl
CF₄
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why can a hydrogen atom form a covalent bond without fulfilling the oct…
Hydrogen's valence shell can hold only up to two electrons.
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water molecules are polar, with the * oxygen side being slightly negati…
oxygen side being slightly negative and the hydrogen side being slightly positive.