化學
化學反應、化學計量、分子結構與元素性質。
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question 8 of 10 what did the periodic table help scientists discover? …
B. Elements not yet known to exist
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post - test activity please answer the following questions in a one who…
1. - $C_{12}H_{22}O_{11}$: $342.34\ g/mol$ - $C_7H_{16}$: $100.23\ g/mol$ - $C_{14}H_{18}N_2O_5$: $294.34\ g/mol$ - $(NH_4)_2SO_4$: $132.17\ g/mol$ 2. - Oranges: $6.022\times 10^{…
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question 7 of 10 an atom of copper (cu) has a mass number of 63 and an …
A. 29
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question 6 of 10 how is each element represented in the periodic table?…
D. Each element is represented by a one or two - letter symbol.
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directions: read the text properties of matter and then answer the ques…
1. Physical property: A characteristic of a substance that can be observed or measured without changing the identity of the substance. Chemical property: A characteristic of a sub…
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question 5 of 10 what does the number above the symbol represent? a. th…
C. The atomic number
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question 4 of 10 potassium (k) has an atomic number of 19. it often for…
C. 18
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question 3 of 10 what does the number below each elements symbol repres…
D. The average atomic mass
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question 2 of 10 how many elements occur naturally? a. 6 b. 25 c. 90 d.…
C. 90
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question 1 of 10 na - 23 has 12 neutrons. what is its atomic number? a.…
A. 11
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click on the element in the periodic table to explore the atomic radii …
A = 1.14 B = 1.30 C = 1.54
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1. which of the following is a base si unit? a) liter b) kelvin c) gram…
1. b) Kelvin 2. b) Cubic meter (m³) 3. b) kg/m³ 4. c) Graduated cylinder 5. c) Mass ÷ Volume 6. b) 45 cm³ 7. b) Float 8. b) Mole 9. c) Liter 10. b) Water displacement
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complete the text with the best transition. recycling electronics is im…
In particular
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3. what is the relationship between an elements isotopes and the elemen…
3. The element's atomic mass is a weighted - average of the masses of its isotopes based on their relative abundances. 4. A weighted average is an average that considers the weigh…
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sublimation is when a solid gains energy and becomes a gas, skipping th…
They move freely and fast
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question 9 (1 point) which of the choices is a subscript in 5h₂cl? a 5 …
Question 9: B. 2 Question 10: A. 5
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how many atoms of chlorine are there in 4hcl? o a 3 o b 100 o c 4 o d 2…
For the first question: C. 4 For the second question: D. 8
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sublimation is when a solid gains energy and becomes a gas, skipping th…
The particles move so fast that they change into a gas.
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how many atoms of carbon are in cellulose, c6h7o2(oh)3? a 7 b 4 c 2 d 6…
For the number of carbon atoms: d. 6 For the number of hydrogen atoms: b. 10
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sublimation is when a solid gains energy and becomes a gas, skipping th…
Sublimation
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sublimation is when a solid gains energy and becomes a gas, skipping th…
It is when a solid becomes a gas.
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choose the correct answer. which of these best describes sublimation? c…
changing from a solid to a gas
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cellulose = c₆h₇o₂(oh)3 how many elements are present in the formula? q…
First question: f. 3 Second question: d. 2
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cellulose = c₆h₇o₂(oh)3 how many molecules are present in the formula? …
Question 1: e. 1 Question 2: e. 4
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question 10 (1 point) if 115g of a substance reacts with 84g of another…
199
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question 8 (1 point) hydrogen and oxygen react chemically to form water…
38.25 18
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question 7 (1 point) hcl + naoh --> h₂o + nacl 2.87g + ____g 3.75g + 1.…
a. 2.86 ### Question 8
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condensation is when a gas loses energy and becomes a liquid. when a ga…
Droplets forming on a window after a hot shower
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condensation is when a gas loses energy and becomes a liquid. when a ga…
C. Condensation
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read the excerpt from ovids \pyramus and thisbe\. the blood leaped high…
The figurative language describes the violence of the scene.
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lt 1: science safety approved eye protection devices (such as goggles) …
Any time chemicals, heat, or glassware are used
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1. what affects the atomic radius of an atom? (0:45) 2. why does the at…
1. The number of electron shells and effective nuclear charge. 2. The number of electron shells increases, making the atom larger. 3. The additional proton in beryllium attracts e…
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2. chlorine (cl) has two isotopes. cl - 37 has an abundance of 23.9% wi…
$35.446183$ g
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name: ______________ date: ______________ per: ______________ 4. which …
The subatomic particle is the neutron. Neutrons contribute to the mass of the atom. Since the number of neutrons in Cu - 63 and Cu - 65 is different (34 and 36 respectively), whil…
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observe the photograph and answer the questions in the box below. 1. wh…
She is wearing gloves. Wearing gloves is important in a laboratory setting to protect hands from chemicals and maintain safety.
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air pressure is the pressure in a given area caused by the weight of th…
- Air pressure is highest: Altitude is lower, such as at sea - level. - Air pressure is lowest: Altitude is highest, such as at the top of Mount Everest.
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across 3. how much matter is in an object 6. how heavy an object is for…
Across: 3. Mass 6. Density 9. Temperature 10. Matter 11. Repel 14. Boil Down: 1. Gas 2. Volume 3. Magnetism 4. Liquid 5. Buoyant 7. Freeze 8. Attract 10. Melt 12. Poles 13. Solid
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13. fill in the following chart for each element or isotope element nam…
| Element Name | Symbol | Isotope Symbol | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | Hydrogen…
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types of matter part 1 directions - use the terms from your \compositio…
1. Heterogeneous mixture 2. Compound 3. Element 4. Homogeneous mixture (solution) 5. Heterogeneous mixture 6. Heterogeneous mixture 7. Heterogeneous mixture 8. Homogeneous mixture
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module 5 neurons: the basic elements of behavior learning outcomes lo 5…
LO 5 - 1: To understand behavior as the brain and nervous system underlie mental processes and actions. LO 5 - 2: Neurons, synapses, etc. LO 5 - 3: Through electrical impulses (ac…
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2 properties of water lesson objectives discuss the unique properties o…
Acid: A substance that donates hydrogen ions (H⁺) in solution. Adhesion: The attraction between different substances. Base: A substance that accepts hydrogen ions (H⁺) or donates …
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practice #6 1. how does the enrollment in physical science compare with…
1. Physical science enrollment generally increased and chemistry enrollment fluctuated. 2. To identify which line represents which data - set. 3. 1984 and 1985.
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practice #5 1. does the price of apples always increase with the demand…
1. No 2. 20 3. $2 ### Practice #6 (Students Enrolled in Physical Science and Chemistry at North High School vs. Years)
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rank the following from most acidic to least acidic. to rank items as e…
$[H_3O^+]=10^{-2}$, pH = 3, pH = 5, $[H_3O^+]=10^{-6}$, pH = 14
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fe³⁺ enter your answers numerically separated by a comma. np, ne = prot…
26,23 38,36
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v3+ enter your answers numerically separated by a comma. np, ne = proto…
23,20 15,18
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how to count atoms worksheet 1. the symbol of an element represents one…
$Br$: 1 $Cl_2$: 2 $Ca_3(PO_4)_2$: $Ca$: 3 $P$: 2 $O$: 8
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ca²⁺ express your answers as integers. enter your answers separated by …
20,18
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chemical properties of water what conditions should allow seawater to h…
D. cold and fresh
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chemical properties of water what is the most commonly occurring compon…
A. chlorine
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the diagram shows the general structure of a lipid, which consists of t…
carboxyl group
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lipids exhibit different characteristics based on their structures. the…
B. $C = C$
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which describes the basic structure of a fatty acid? a long carbon and …
a long carbon and hydrogen chain and a carboxyl group
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co²⁺ express your answers as integers. enter your answers separated by …
27,25 17,18
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96 42mo enter your answers numerically separated by a comma. view avail…
42,54 15,16
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40 20 ca enter your answers numerically separated by a comma. > view av…
20,20 88,140
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chemical properties of water what has a greater density? ○ cold freshwa…
cold saltwater
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4. a student was performing a reaction of neutralization of baking soda…
a) $2.95$ b) $1.05$ c) $25.0+15 + 12+1 = 53.0$ d) $\frac{2.95}{84.007}\approx0.0351$ e) $0.0351$ f) $0.0351\times60.052\approx2.11$ g) $53.0\times1.05 = 55.65$ h) $\frac{2.11}{55.…
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process of incorporating new objects or situations into existing schema…
C. assimilation
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5. which of the following forms of potential energy do you think this c…
D. gravitational potential energy
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14. ni 15. p 16. cr 17. mn 18. cu 19. zn
18. Cobre 19. Zinc
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kinetic energy whenever an object is moving, it has the ability to do w…
The flexed bow has potential energy. The energy in the bow is due to its condition. When the string is released, work will be done on the arrow.
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extension: using the deciphering tool below and your periodic table, fi…
THE BEST CHEMISTRY CLASS EVER
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3. to neutralize 0.035 moles of baking soda, one needs ______ mole(s) o…
0.035
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extension using the deciphering tool below and your periodic table, fin…
THE EXPERIMENT IS TOO BIG TO FAIL
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try to spell your first and last name using the chemical symbols. for e…
No specific answer as no name is provided to spell using chemical symbols.
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to neutralize 0.035 moles of baking soda, one needs ____________ mole(s…
0.035
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is an effort or strategy to achieve a goal or a solution to a problem t…
A. Problem solving
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practice it tendency to focus on only one aspect of a situation at a ti…
D. centration
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evaluate match each subfield of psychology with the issues or questions…
1. c. Cognitive psychology 2. d. Developmental psychology 3. b. Experimental psychology 4. a. Behavioral neuroscience 5. e. Personality psychology 6. d. Developmental psychology 7…
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at the boiling - point, the density of the liquid is 809 g/l and that o…
$5.59\ L$
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element symbol words use the listed atomic numbers to find the element …
1. Algebra 2. Amuse 3. Bonus 4. Clock 5. Conjure 6. Dynamite 7. Fraction 8. Lady 9. Money 10. Montana 11. Mousse 12. Phone 13. Raccoon 14. Tickle - B 15. Watch
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after reading lesson 1.2, answer the following questions. why study che…
1. a. Understand matter and its changes. b. Design new materials. c. Develop new drugs. 2. Pharmacist Chemical engineer Forensic scientist 3. The application of scientific knowled…
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practice it mental framework for understanding or acting on the environ…
D. schema
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question 3 of 25 what is the complete ionic equation for the reaction b…
A. \(2Na^{+}(aq)+SO_{4}^{2 - }(aq)+Ca^{2+}(aq)+2Cl^{-}(aq)\to CaSO_{4}(s)+2Na^{+}(aq)+2Cl^{-}(aq)\)
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big ideas in chemistry 5. another name for a \big idea\ is 6. what are …
5. Theme 6. c. Matter and its properties d. Energy changes e. Atomic structure f. Molecular structure g. Chemical bonding h. States of matter
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5. a reaction between sodium borate and acetic acid is a neutralization…
b) It is not possible to detect the point when the reaction is completed, and you should stop adding vinegar (if you follow the procedure as it is written in this handout).
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question 27 of 30 what is the oxidation state of n in nano₃? a. -1 b. 0…
D. +5
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question 26 of 30 how are all compounds similar? a. they are all made u…
A. They are all made up of atoms of two or more different elements.
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question 25 of 30 what is the cathode in an electrochemical cell? a. th…
B. The electrode where reduction occurs
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question 24 of 30 which reaction occurs at the cathode of a galvanic ce…
C. $\ce{Cu^{2+}(aq) + 2e^{-}\to Cu(s)}$
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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question 23 of 30 the half - reaction at the cathode in an electrochemi…
C. $Zn(s)\to Zn^{2+}(aq)+2e^{-}$
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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practice it process of incorporating new objects or situations into exi…
B. assimilation
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question 22 of 30 which statement best describes how energy is importan…
A. Energy is absorbed and released during chemical reactions.
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when you _______, you make a plan or a plot. it may take you longer to …
scheme; scheme
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when you _______, you make a plan or a plot. it may take you longer to …
scheme
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question 21 of 30 which would most likely be reduced when combined with…
A. Ni
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question 20 of 30 what allows electrons to flow between electrodes in a…
B. Conducting wire
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question 19 of 30 how can scientists model the effects of reactant conc…
A. With a computer model
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question 1 - 16 scientists once believed that all headaches were caused…
Repeated studies provided scientists with new evidence.
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1. energy of moving electrons or electric charges 2. energy of light 3.…
2. Radiant 3. Thermal 4. Sound 5. Chemical 6. Nuclear 10. Chemical
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after reading lesson 1.1, answer the following questions. what is chemi…
1. Matter is anything that has mass and takes up space. 2. Chemistry is the scientific study of the properties, composition, structure, and reactions of matter.
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read and answer the questions to assess your prior knowledge of the con…
1. C. Solid 2. B. take the shapes of their containers 3. D. atoms, which are too small to be seen and have energy. 4. A. is greater than the energy of atoms in solids but less tha…
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éléments chimiques symbolo radium krypton chlore calcium lithium bore o…
Radium : Ra Krypton : Kr Chlore : Cl Calcium : Ca Lithium : Li Bore : B Oxygène : O Hélium : He Sodium : Na Magnésium : Mg
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which of the following permits are for businesses who comply with regul…
Environmental permit
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question 30 of 30 a liquid changes color as it cools and becomes solid.…
D. Identifying the solid and liquid as the same substance would confirm that a physical change took place.
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in this simulation, you will be exploring the relationship between temp…
1. When the temperature is raised from 300 K to 400 K (while keeping volume constant), the pressure increased. The initial pressure range is 5.4 - 6.2 atm and the pressure range w…
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reading evaluation 1. which definition best matches the meaning of elev…
1. C. The action of being elevated 2. C. barometer 3. D. mass 4. B. "At higher elevations, decreased atmospheric pressure is being exerted on the surface of the water, and the mol…