化学
化学反応、化学量論、分子構造、元素の性質。
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it takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce …
B. $2N_2$ and $6H_2$
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balance of atoms quick check which statement correctly explains why the…
Some of the atoms in the paper became gases.
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average atomic mass how are the masses on the periodic table determined…
1. 12 2. 24, 25, 26 3. No. They are different isotopes with different numbers of neutrons and thus different atomic masses. 4. a. | Isotope | Mass Number | Number of Atoms | | ---…
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one molecule of calcium oxide, cao, and one molecule of carbon dioxide,…
$CaCO_3$
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when iron rusts and forms iron oxide, the iron oxide has more mass than…
The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
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2. what does the piano analogy teach us about electrons? an electron is…
The piano analogy likely teaches us that electrons in atoms are arranged in distinct energy - related positions (like piano keys producing different sounds), and their arrangement…
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2. what does the piano analogy teach us about electrons? 1. why do scie…
Electrons do not have a single, fixed weight like atoms; they have a range of possible masses within an atom and do not have a single, exact weight, emphasizing their probabilisti…
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drag and drop each label to the correct area of the venn - diagram. som…
Compounds: Chemically combined, Fixed proportions, Components change properties Both: Made of elements, 2 or more components Mixtures: Physically combined, Variable proportions, C…
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balancing chemical reactions date____/____/____ provide the coefficient…
1. $1H_2O + 1K_2O ightarrow 2KOH$ 2. $2H_2O ightarrow 2H_2+1O_2$ 3. $1O_2 + 2N_2 ightarrow 2N_2O$ 4. $2H_2O + 2Na ightarrow 1H_2 + 2NaOH$ 5. $2Na + 1I_2 ightarrow 2NaI$ 6. $1Cl_2 …
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1. the process in which a set of substances are changed at the molecula…
1. B. a chemical reaction 2. A. a reactant 3. None of the above (should be a catalyst); if choosing the closest, no perfect option as given. 4. D. a product 5. A. A catalyst...an …
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calculating atomic mass isotopes that are common in nature have greater…
24.32 amu
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questions: homogenous mixtures circle the correct answer. 1. what is a …
1. A. a mixture in which the components are distributed evenly 2. D. a substance into which another substance is dissolved 3. D. an alloy 4. B. can be separated again, but it may …
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identifying compounds, elements, mixtures through common names elements…
| Substance | Element | Compound | Mixture | | ---- | ---- | ---- | ---- | | Soil | | | √ | | Water | | √ | | | Sodium | √ | | | | Ice | | √ | | | Glucose | | √ | | | Antimony | √…
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your teams questions use the information above to answer the following …
1. Atoms are too small to weigh directly. Carbon - 12 is stable and its mass defines 1 amu for relative mass measurement. 2. Electrons occupy discrete energy levels and can jump b…
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2. was the ph of the vinegar - baking soda solution different than that…
Yes, the pH of the vinegar - baking soda solution is different from that of vinegar or baking soda alone because of the neutralization reaction between the acid (vinegar) and the …
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which of the following does not involve a chemical process that decompo…
Ice wedging
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a landslide is an example of ○ mass movement ○ chemical weathering ○ gl…
mass movement
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bellringer: 1. what are the rules for naming ionic bonds? 2. what are t…
1. Name metal (cation) first, then non - metal (anion) with - ide ending for simple anions or use polyatomic ion name as is. 2. Name first element as is, second with - ide ending,…
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what does the o - horizon consist of? weathered rock and organic materi…
humus and leaf - litter
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the formation of a cave occurs when groundwater dissolves limestone. tr…
1. True 2. Organic matter such as decaying grass and other plant material.
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decomposition: the breaking down of a chemical compound into its elemen…
6. $2Cl_2O_5 ightarrow 2Cl_2 + 5O_2$ 7. $2N_2O_5 ightarrow 4NO_2+O_2$ 8. $2AlCl_3 ightarrow 2Al + 3Cl_2$ 9. $8Fe_2S_3 ightarrow 16Fe+3S_8$ 10. $2ICl ightarrow I_2 + Cl_2$
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exercise 04: thermochemistry directions: download and print this docume…
a. $2.372228\times10^{6}\ J$ b. 681 Cal c. 0.968504 kJ d. 3155 kcal
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match the vocabulary words to their definition. draggable item category…
oxidation - The chemical reaction of oxygen with other substances chemical weathering - The process by which rocks and minerals change in their composition as the result of chemic…
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2. what effect does acid rain have on building materials like marble an…
It chemically dissolves and weakens them.
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how many nitrogen atoms per molecule are present if the molecular formu…
4
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21. the type of energy as a result of position of an object is (a) kine…
21. c. potential energy 22. b. is the same as the force with which the moon attracts the earth.
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attendance question 1. the notation for an isotope of oxygen is shown b…
1. Li - Symbol of the element; 6 - Mass number; 3 - Atomic number 2. (a) Lithium - 7 has greater abundance. (b) Lithium - 6: Mass number 6, Atomic number 3, Protons 3, Electrons 3…
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hydrochloric acid and magnesium were placed in a flask. a stopper with …
D. Measure the temperature of the mixture
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13. sulfur is represented by the following lewis structure. which of th…
13. a. Oxygen 14. A. \(1s^2 2s^2 2p^1\) 15. b. 3 16. c. number of electrons in the orbital.
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how do rivers and streams shape the land? ○ through volcanic eruptions …
By wearing away rock and soil through erosion
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what information does a molecular formula display? o the atomic number …
the number of atoms per molecule
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what information does an empirical formula display? o the atomic radius…
the atomic ratio
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the best action humans can take to decrease the effect of harmful growt…
C. control the use of fertilizers
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commercial fertilizers, which are made by humans, are used to enrich so…
It improves the growth of crops. It harms organisms that live in the oceans.
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which of the following correctly pairs a phase of matter with its descr…
B. Gas: Particles have higher amount of motion when in the gas phase compared to the liquid phase.
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15. what aspect of lunar rocks has been studied through radiometric dat…
C) Their formation processes
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gels for \test brains\ did you know that every thought you have comes f…
There is a positive correlation between the amount of NaCl in the conducting gel and the level of conductivity.
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1. a(a) heterogeneous mixture has different materials that can be easil…
1. heterogeneous 2. solution 3. suspension 4. compound 5. element 6. homogeneous 7. Tyndall 8. physical 9. chemical 10. conservation
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multiple choice questions 1. what isotope is primarily used in potassiu…
1. B. Potassium - 40 2. B. Marie Curie 3. B. Lead 4. B. It requires a closed system. 5. A. 5730 years
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what invention, by michael faraday, became later known as the first ele…
First question: D. the dynamo Second question: D. Dmitri Mendeleev
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what is joseph lister credited with? * antiseptic (germ killing) anesth…
1. antiseptic (germ killing) 2. the Bessemer process
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put the following in order from least to most forceful (least forceful …
1. Orders to Disperse 2. Selective Use of Pepper Spray 3. Mobile Field Forces 4. Use of Chemical Agents 5. Use of Impact Munitions 6. Multiple Arrests
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what is crawford long credited with? * antiseptic (germ killing) anesth…
1. B. anesthetic (pain meds) 2. B. Pasteurization 3. A. light bulb
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which property of the substance is a chemical property? a the temperatu…
D. The flammability
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cosmetology infection control worksheet - basic level name: zayfa suber…
1. A. c) Sterilization 2. B. b) Wooden spatula 3. Hands should be washed for at least 20 seconds before and after each client. Implements should be immersed in disinfectant for 10…
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multiple select question select all that apply read the passage shown h…
Waterways all over the world are becoming polluted with sewage. Industrialized countries have an overly casual attitude toward chemical pollution. The growth of heavy industry con…
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integrated chemistry physics second law using net force given the follo…
$1200\ N$
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integrated chemistry physics vtons 2nd law using net force given the fo…
$27\ N$
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integrated chemistry physics s 2nd law using net force given the follow…
Net Force = $360\ N$ Acceleration = $9\ m/s^{2}$
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ions • click reset • check that sodium and chlorine are still selected.…
1. A. Sodium: 11, Chlorine: 17 B. Sodium: 11, Chlorine: 17 2. Sodium: 1, Chlorine: 7 3. A. Sodium: + 1, Chlorine: - 1 B. Both ions are stable. Sodium ion has a full outer - shell …
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an element with mass 970 grams decays by 15.1% per minute. how much of …
Approximately 97.4 grams
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tree roots can break down rock into soil. which type of weathering is t…
Physical
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name: abby short date: 10/23/24 unit 1 worksheet 4 - applied density pr…
1. Density of metal A: (Actual value based on graph - reading, example: $5\ g/mL$), Density of metal B: (Actual value based on graph - reading, example: $3\ g/mL$) 2. a. $40\ g$ b…
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which statement best describes the law of conservation of matter? matte…
Matter may change form, but it cannot be created or destroyed.
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invasive plants can threaten wildlife diversity by overpopulating areas…
A. it helps detect the infestation early to prevent needing more drastic techniques such as spraying chemicals
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what is \green exercise\? multiple choice exercising without having to …
D. exercising outdoors in natural settings
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41. sodium is a metal, like copper. suggest reasons why sodium cannot b…
Sodium is highly reactive with water and air, and has a low melting - point, so it cannot be used in electrical wires.
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3) read the name of the elements in the first and second columns on the…
a) Many names end with -ium. b) Hydrogen
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2) name the chemical family to which each of the following elements bel…
a. Halogen b. Alkaline - earth metal c. Alkali metal d. Noble gas
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2) name the chemical family to which each of the following elements bel…
a) a) Chlorine: Halogen family; b) Magnesium: Alkaline - earth metals family; c) Potassium: Alkali metal family; d) Helium: Noble gases family b) a) Many names end with "ium"; b) …
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1) which of the following statements are correct? rewrite each false st…
a) False. Elements listed in columns on the periodic table belong to the same family. b) False. Elements in the same column of the periodic table exhibit similar chemical properti…
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multiple - choice question why is it so important that water is a unive…
Because water will dissolve important nutrients and chemicals
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name _ id _ subject chemistry period _ date _ atomic structure unit - w…
An atom is the fundamental building block of matter. Subatomic particles are protons (charge +1), neutrons (charge 0), and electrons (charge - 1). Protons and neutrons are located…
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this is a substance made of 2 or more elements that are chemically comb…
Compound, Mixture, Element
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9. where are transition metals found in the periodic table? 10. what 3 …
9. Groups 3 - 12 of the periodic table. 10. High luster, good malleability, relatively high resistance to corrosion. 11. Poor conductors of heat and electricity, brittle (if solid…
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9. if a is a chlorine atom, which one would represent a chlorine ion wi…
- Chlorine ion with - 1 charge: A chlorine atom that has gained 1 electron, because gaining 1 electron gives it a stable octet. - Chlorine ion with + 1 charge: A chlorine atom tha…
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periodic trends practice problems: ionization energy 1. define ionizati…
1. The energy required to remove an electron from a gaseous atom or ion. 2. Indium, tin, antimony, iodine. 3. Potassium, manganese, nickel, bromine. 4. Lead, tin, germanium, carbo…
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in the modern periodic table elements are arranged by: valence electron…
B. atomic number
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the energy required to remove electrons is the definition of: atomic nu…
C. Ionization
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francium (fr) has the lowest ionization energy in group 1 because - it …
its 1 valence electron is very far from the nucleus, so little energy is needed to remove it
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as you move down a group, atomic radius increases because - you add mor…
you add more and more shells (energy levels)
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which element has the smaller atomic radius: potassium (k) or bromine (…
bromine (Br)
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the atom with the largest atomic radius in period 4 (row 4) is - kr k f…
B. K
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which has the greater electronegativity: n or c?
N
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of the halogens, which has the smallest radius? f at he br
F
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ionization energy is the... ability of an atom to attract electrons fro…
energy needed to remove the outermost electron.
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which element has the greatest ionization energy: aluminum (al) or chlo…
Chlorine (Cl)
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the element with the smallest ionization energy in period 6 is -
Cs
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the atom with the largest atomic radius in group 18 is -
Rn
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identify each of the following as either an atom, element, molecule or …
a. Compound b. Atom/Element c. Atom d. Atom/Element e. Molecule
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compounds how can you tell if a substance is an element or a compound? …
Compounds have two or more capital letters in their chemical symbol(s) (because they are made of multiple elements with their own symbols which may start with capitals), while ele…
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what is the difference between ionic and covalent bonds? give an exampl…
Ionic bonds involve electron transfer between a metal and non - metal (e.g., NaCl). Covalent bonds involve electron sharing between non - metals (e.g., H₂O).
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which factors can affect the amount of cocoa mix that can be dissolved …
adding ice, adding heat, altering amount of water, using a different kind of cocoa mix, stirring, breaking down the cocoa mix into smaller particles
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name each element and the number of atoms of that element in one molecu…
Carbon: 2 atoms; Hydrogen: 4 atoms; Oxygen: 2 atoms
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the graph below shows how solubility changes with temperature. solubili…
65 g/100 mL of water
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a student is told to study the chemicals nitrogen monoxide (no) and nit…
The student is wrong. The two molecules have different numbers of oxygen atoms which result in different properties.
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a chemist has dissolved a certain substance in water. the chemist knows…
unsaturated
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a chemist dissolved crystals of an unknown substance into water at room…
its solubility
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which is the second step in the dissolving process? the solute is mixed…
The solvent molecules surround the solute particles.
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under which conditions will sugar most likely dissolve fastest in a cup…
sugar crystals with stirring at 15°C
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solute crystals are added to a solution until they begin to sink to the…
unsaturated
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why do all isotopes of an element have the same chemical properties? ho…
All isotopes of an element have the same chemical properties because they have the same number of electrons. They are different in the number of neutrons.
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under which conditions would the solubility of a gas be greatest? high …
B. high pressure and low temperature
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2.4 why do all isotopes of an element have the same chemical properties…
All isotopes of an element have the same chemical properties because they have the same number of protons and electrons. Isotopes of an element are different in the number of neut…
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which is true about the dissolving process in water? nonpolar solutes d…
Molecules or ions of a solute spread throughout the water molecules.
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a beaker contains a solution. a single solute crystal is added to the s…
supersaturated
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a 1 - l soda bottle contains dissolved carbon dioxide gas. which bottle…
a bottle that is sealed
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rachel is performing an acid - base titration. she hopes to determine t…
D. buret
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use the graph to identify the number, letter, or word that completes ea…
- decreases - E - 25 - B
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use the graph to identify the number, letter, or word that completes ea…
- decreases - E - 25 - A