化学
化学反应、化学计量、分子结构与元素性质。
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paper can be made from many plants, but usually trees are used. first, …
A. process
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the graduated cylinder below shows major scale divisions every 5 ml. ho…
36 mL
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quiz: period table & trends possible points: 10 match the definitions w…
1. group 18, has 8 valence electrons -> noble gases 2. Outer - shell (energy level) electron -> valence electron 3. Amount of energy needed to remove an electron -> ionization ene…
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quiz: period table & trends possible points: 10 elements in group 17 ha…
A. 7, gain
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quiz: period table & trends which element is the most electronegative? …
D. F
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quiz: period table & trends the figure below shows chlorine iodine and …
C
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the periods and groups on the periodic table are numbered. for example,…
E. Bromine (Br) in period 4, group 17
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guiding questions how did the boys and their coach react to the life - …
A. They kept themselves alive and mentally stable.
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choose the type of bond that best matches each of the following descrip…
a. nonpolar covalent bond b. polar covalent bond c. hydrogen bond
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arrange the elements in the third period in order of decreasing atomic …
Sodium > Phosphorus > Sulfur
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why does the atomic radius change down a group/family? number of proton…
Number of layers (Shielding effect) increases down a group, therefore making radius bigger
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the most distinctive property of the noble gases is that they are _____…
C. largely unreactive
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question 7 0.5 pts which of the following questions is/are true? there …
Each water molecule has regions of charge. When water molecules “stick” to other water molecules, this is called cohesion. A hydrogen bond is weak compared to a covalent bond.
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which of the following molecules can form? there is only one correct an…
Molecule D
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read this excerpt from a passage. in 2008, the once - thriving company …
Profits fell, but that was not the story the leaders of the company were telling.
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why does the procedure use a graduated cylinder and not simply have you…
Accuracy is important in the laboratory. There is no way to accurately put 2 mL into a test tube without first measuring 2 mL in the graduated cylinder.
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calcium (ca) is predicted to have a reactivity than potassium (k) and a…
Less; More; More; Less
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multiple - choice question choose the item with the highest electronega…
S (sulfur)
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which patterns are observed on the periodic table of the elements? sele…
B. As you look from left to right within a period, ionization energy increases. C. As you look from left to right within a period, electronegativity increases. D. As you look from…
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multiple - choice question choose the atom with the highest ionization …
C. Cl
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multiple - choice question choose the larger item potassium atom (k) po…
Potassium Atom (K)
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multiple - choice question choose the larger item. bromine atom (br) br…
Bromine Anion (Br - 1)
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which of these is the correct lewis dot structure for the nitrogen atom?
The structure with 5 dots around the 'N' (the third option among the ones shown as it has two dots on one side and one dot on each of the other three sides) is the correct Lewis -…
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what determines the chemical properties of an element? o atomic number …
C. number of valence electrons
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multiple - choice question which element has the highest electronegativ…
C. Fluorine
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which element is represented by the following electron configuration: 1…
silicon
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which of these has 28 protons and 26 electrons? o fe o fe²⁺ o ni o ni²⁺
D. $Ni^{2+}$
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2. identify each of the common items below as an element, a compound or…
A. Compound B. Element C. Compound D. Mixture E. Element F. Mixture G. Element H. Mixture I. Mixture J. Element K. Compound L. Mixture
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an atom with an atomic number of 50 and a mass number of 120 contains 5…
50 protons, 50 electrons, 70 neutrons
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multiple - choice question what is electronegativity? the atoms ability…
the atom's ability to hold electrons tightly
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multiple - choice question why do we disregard the noble gasses for ele…
they follow the octet rule with 8 valence electrons
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1. identify each of the drawings below as an element, a compound or a m…
For the drawings: Analyze particle - types as described above. For the common items: A. Compound B. Element C. Compound D. Mixture E. Element F. Mixture G. Element H. Mixture I. M…
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what is the trend in ionization energy as you move across period 2, fro…
C. Increases
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3. which of the following is not a true statement? a. two or more atoms…
B. Pure substances are made of only one type of atom.
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3. which of the following is not a true statement? a. two or more atoms…
B. Pure substances are made of only one type of atom.
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multiple - choice question what is ionization energy? the atoms tendenc…
energy required to remove an electron from an atom
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multiple - choice question how is the ion magnesium mg+2 made? the atom…
the atom loses two electrons
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as you move left to right across the periodic table valence electrons f…
the nucleus has more protons
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amount of hydrogen vs. ph amount of hydrogen, x (in moles per liter) ph…
The function $f(x)=-\log_{10}(x)$ models the data in the table.
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multiple - choice question what is the atomic radius? the size of the a…
the size of the atom
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section review 1. use the periodic table on the inside back cover to wr…
1. Oxygen, Sulfur, Copper, Silver 2. Fe, N, Ca, Hg 3. Elements in a group 4. Metals are good conductors, shiny, malleable and ductile. Non - metals are poor conductors, dull, brit…
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13) match the descriptions with the elements. the most abundant element…
1. Oxygen 2. Helium 3. Silicon 4. Aluminum 5. Iron 6. Calcium
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which element does the chart describe? ?????? . it is the lightest elem…
B. hydrogen
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how many elements exist naturally on the earth? 118 98 7 fundamental
B. 98
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multiple - choice question how many valence electrons are in group 2? 1…
C. 2 valence electrons
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a(n) ____ is a specific type of atom or molecule with unique properties…
C. element
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multiple - choice question why do elements in a group behave similarly?…
They have the same number of valence electrons
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patterns of properties quick check what are valence electrons? (1 point…
the electrons in an atom's outermost energy level
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multiple - choice question what do the blank boxes represent? elements …
C. elements Mendeleev said would be discovered later.
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patterns of properties quick check why do atoms exchange or share elect…
to obtain a full outer electron shell
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question 1 - 6 what property of water allows it to be a versatile solve…
polarity
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patterns of properties quick check which feature defines a neutral atom…
the number of electrons equal to the number of protons
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multiple - choice question how did mendeleev arrange chemicals with sim…
In columns called groups
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9) drag and drop the answers to the atom diagram.
- The central part (the red - orange part in the diagram) is the nucleus. - Inside the nucleus, the positively charged particles are protons and the neutral particles are neutrons…
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multiple - choice question who is best known for designing the periodic…
C. Dmitri Mendeleev
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____ are the smallest parts of matter that still contain all the proper…
A. Atoms
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which two facts are about electrons? the negatively charged particles a…
The negatively charged particles are smaller than protons and neutrons. They move extremely fast in the electron cloud around the atom’s nucleus.
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observa la reacción usando el siguiente video:https://www.youtube.com/w…
# Explicación: ## Paso 1: Comprender la reacción química La reacción entre cloruro de hidrógeno y amoníaco forma cloruro de amonio (un sólido que se ve como un anillo blanco). La …
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section review 1. a. what is the main difference between physical prope…
1. a. Physical properties don't change substance identity; chemical properties do. 1. b. Physical: color; Chemical: flammability. 2. a. Physical change. 2. b. Physical change. 2. …
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6 multiple choice 1 point li + select the correct electron configuratio…
D. $1s^{2}$
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4 multiple choice 1 point li select the correct electron configuration …
B. 1s² 2s¹
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3 fill in the blank 1 point a neutral atom has choose your answer... am…
1. equal 2. more 3. fewer (less)
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2 multiple answer 1 point which electron configurations below are stabl…
A. $1s^{2}$ C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ D. $1s^{2}2s^{2}$
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material, pure substance or mixture, element, compound, homogeneous, he…
| Material | Pure Substance or Mixture | Element, Compound, Homogeneous, Heterogeneous | |--|--|--| | concrete | Mixture | Heterogeneous Mixture | | orange juice with pulp | Mixtu…
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1 multiple answer 1 point which electron configurations below are stabl…
$1s^{2}2s^{2}2p^{6}$, $1s^{2}2s^{2}2p^{3}$, $1s^{2}2s^{2}$, $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}$, $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}$
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question 7 points 1 if you want to prepare ozone, you will need _______…
a molecule of oxygen and one nascent oxygen
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question 4 points 3 which of the following best explains why the use of…
The gases that are released cause the reduction of level of ozone in the stratosphere.
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periodic table metals vs. nonmetals match the description on the left w…
18. D. nonmetals 19. C. metals 20. C. metals 21. D. nonmetals 22. C. metals 23. O < Se < K < Cs 24. P < Ti < Fe < Ba 25. Rb < Sn < Xe < Ar 26. Sr < Mg < C < F 27. S. transition me…
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most new cars and trucks are fitted with catalytic converters. catalyti…
D. $\mathrm{CO_2}+\mathrm{H_2O}$
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a variety of air pollution control devices remove pollutants from indus…
B. scrubbers
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question 4 points 3 assertion (a): the ozone layer protects the earth f…
(A) is true, but (R) is false
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which of the following best completes the analogy? carbon dioxide/gas/c…
A. Carbon dioxide/Gas/Carbonic acid
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do now: 1. which of the following is not a characteristic of a physical…
1. d. new substance 2. c. mass 3. Look for changes in physical properties like state, shape, size, color, or texture without the formation of new substances.
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complete lo siguiente basándose en los resultados del experimento virtu…
1. alta 2. baja 3. más alto 4. uniforme
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• escriba explicaciones científicas sobre “el permanganato de potasio s…
# Explicación: ## Paso 1: Comprender el concepto de difusión La difusión es el movimiento de moléculas de alta a baja concentración. ## Paso 2: Aplicar al caso del permanganato de…
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3. vertical columns on the periodic table are called 4. horizontal rows…
3. Groups 4. Periods 5. Atomic 6. Mass 7. Transition metals 8. Alkali metals 9. Alkaline - earth metals 10. Noble gases 11. Halogens 12. 1 13. 17 14. 18 15. Ductility 16. Malleabi…
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1. tell which element is located in the following groups and periods. a…
a. Calcium (Ca) b. Iodine (I) c. Krypton (Kr) d. Indium (In) e. Iron (Fe) f. Gold (Au) g. Lithium (Li) h. Titanium (Ti) i. Silicon (Si) j. Fluorine (F) k. Calcium (Ca) l. Sodium (…
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a solution of salt water was placed in the evaporating dish. the burner…
The white crystal solid is salt (sodium chloride). It is a compound.
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complete the following table: element electron config. highest e level?…
| Element | Electron Config. | Highest E level | # Valence e⁻ | # of protons | Is it stable? | | ---- | ---- | ---- | ---- | ---- | ---- | | Carbon | $1s^{2}2s^{2}2p^{2}$ | 2 | 4 …
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23. why does a chemical reaction that makes the mixture feel cold indic…
Thermal energy is absorbed from the surroundings.
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22. which of the following equations correctly shows the endothermic re…
B. $2Al_2O_3(s)+3C(s) + \text{heat} ightarrow4Al(s)+3CO_2(g)$
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the ph scale coffee egg white 20. a 3 soda b 5 water c 7 d 9 ammonia so…
The hydroxide and hydrogen ion concentrations are equal at neutral pH.
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hay cuatro ideas principales detrás de la teoría de partículas de la ma…
partículas, movimiento, rapidez, espacios, atracción - repulsión
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which element shares similar properties with zinc (zn)? mercury (hg) ti…
Mercury (Hg)
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the number in each square of the periodic table tells us the atomic num…
B. Sulfur (S)
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which element shares similar properties to aluminum (al)? gallium (ga) …
Gallium (Ga)
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name: ______________ block: ______________ progress check atomic radius…
Potassium is larger than calcium because of weaker nuclear - attraction on outer electrons in the same period. Antimony is larger than phosphorus due to more electron shells down …
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which element shares similar properties to chlorine (cl)? fluorine (f) …
Fluorine (F)
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banco de palabras atracción sólido partículas asunto movimiento gaseoso…
sólido líquido gaseoso
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which element shares similar properties with calcium (ca)? scandium (sc…
Strontium (Sr)
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19. which products best complete the balanced equation between sulfuric…
B. $Na_2SO_4 + 2H_2O$
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pregunta de asistencia instrucciones ● lea el pasaje a continuación y u…
partículas, masa, espacio, partículas
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pregunta de asistencia instrucciones: lea el pasaje a continuación y us…
La química estudia la composición, la estructura, las propiedades y las reacciones de la materia. Todo lo que nos rodea está hecho de materia. Todo lo que tiene masa y ocupa espac…
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5. how many moles are in 30.0 g argon? 0.751 mol 1.20 x 10³ mol 1.33 mo…
0.751 mol
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which of these work together to attach to rock to chemically change roc…
pioneer species
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4. how many grams are in 1 mole of nitrogen? 58.69 g 14.01 g 20.18 g 7 …
14.01 g
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3. a balloon contains 4.50×10²¹ atoms of helium (he) gas. calculate the…
$0.0299$ g
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2. calculate the number of molecules in 2.5 mol of sucrose.
1.51×10^24 molecules
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1. calculate the number of moles in 3.79×10²³ molecules carbon dioxide.…
0.630 mol
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95 multiple choice 1 point during an infection control audit, ppe stora…
D. Store PPE in a clean, dry, temperature - controlled environment