Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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the list identifies various properties of four elements. element 1 is a…
Elements 2 and 4
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identify all of the items that represent an element and not a molecule.…
H, Li, Ne
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read the passage and answer the next two questions. during a classroom …
It has two valence electrons. It belongs to the third period.
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which arrangement of the following period 5 elements, from left to righ…
Te, Sb, In, Sr, Rb
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exam 1 which of the following is a characteristic of the group 14 eleme…
They have 4 valence electrons.
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which list arranges the elements na, li, k, rb, and cs in order of incr…
Cs, Rb, K, Na, Li
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exam 1 which characteristic is not a periodic trend? o atomic radius o …
number of elements in a group
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question 1. which list of elements contains a metal, a metalloid, and a…
Sodium (Na), boron (B), and oxygen (O).
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question 2. match the name of each group with its corresponding group n…
Group 1 (or 1A): Alkali Metals Group 2 (or 2A): Alkaline Earth Metals
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in this performance task you will answer four questions. the electron c…
Yes, similar precautions are needed because potassium is highly reactive and its reaction with Atom Y will be exothermic, releasing a large amount of heat which could crack the gl…
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#9.) a sudden and violent movement of a tectonic plate could cause a(n)…
- #9. c. All of the above - #10. a. mechanical weathering - #11. a. glacier
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question 3. metals, metalloids, and nonmetals are essential categories …
Metals: Key properties - shiny, malleable, ductile, good conductors of heat and electricity. Example: Copper, used for electrical wiring due to its excellent conductivity. Metallo…
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unit 1- matter and the mole 22. which substance cannot be decomposed in…
22. b. aluminum 23. a. homogeneous composition 24. a. Control 25. d. 3.4 g/mL 26. c. Amount of water 27. b. Corn without fertilizer 28. d. dependent variable 29. b. 1.0 30. c. $6.…
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12. a chlorine atom has a mass number of 37 and an atomic number of 17,…
20
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oxygen - 18 has an atomic number of 8, how many electrons are in a neut…
8
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unit 1- matter and the mole unit 1 practice test directions: differenti…
3. 1.5 g/cm³ 4. 2.19 g/cm³ 5. 128.544 g 6. Mixture 7. Pure substance 8. Pure substance 9. Heterogeneous mixture 10. Homogeneous mixture 11. Heterogeneous mixture 12. $3.99\times10…
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10. look at the isotope data below: isotope mass (amu) abundance (%) si…
The average atomic mass of silver is $108.07$ amu. Silver - 107 contributes more to the average.
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9. isotopes of carbon include carbon - 12 and carbon - 14. how is their…
Carbon - 12 and Carbon - 14 have the same number of protons (6), but Carbon - 12 has 6 neutrons and Carbon - 14 has 8 neutrons.
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a neutron can be defined as clear all a particle with mass roughly equa…
A particle with no charge located inside of the atom and with mass roughly equal to that of the proton.
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7. an atom of neon has a mass number of 20 and an atomic number of 10. …
10
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use the trends notes in the next page to answer the following questions…
1. oxygen < carbon < aluminum < potassium 2. aluminum < neon < sulfur < oxygen 3. Fluorine has a smaller atomic radius and higher effective nuclear charge, so its outermost electr…
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4. the atomic number of sodium is 11, how many protons does sodium have…
C. 11
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how does the tilt of the earths axis affect the seasons? by changing th…
By changing the amount of direct solar energy reaching the surface of Earth.
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practice: atomic calculations part 1 atomic structure 1 draw five proto…
| Element | Atomic # | Mass # | # of $p^{+}$ | # of $n^{0}$ | # of $e^{-}$ | | ---- | ---- | ---- | ---- | ---- | ---- | | Li | 3 | 7 | 3 | 4 | 3 | | P | 15 | 31 | 15 | 16 | 15 | …
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2. propose a model for how what you identified in question 1 is able to…
1. Cellulose is broken down by enzymes (such as cellulases) through hydrolysis of glycosidic bonds. 2. The reaction of breaking bonds between two glucose monomers in maltose is $C…
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one brand of vinegar has a ph of 4.5. another brand has a ph of 5.0. th…
$2.2\times10^{-5}$
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1. atoms and chemicals (a) explain the structure of an atom. 2. (a) sod…
| Subatomic particle | Charge | Number present in a sodium atom | |--|--|--| | Electron | - 1 | 11 | | Neutron | 0 | 12 | | Proton | + 1 | 11 | (ii) Ion (b)(i) $CaCO_{3}$
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poems by edmund spenser notice how spenser uses vivid imagery to convey…
1. **Rhyme - scheme annotation**: In the first and third lines, the rhyming pair is "ice" and "desire". In the second and fourth lines, the rhyming pair is "great" and "entreat". …
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solution is a measure of how acidic it. the acidity, the lower the ph. …
2
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what is the chemical symbol for magnesium? mo mn mg md
C. Mg
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which element is a halogen? argon bromine calcium lithium
B. bromine
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which is classified as an inner transition element? calcium copper ferm…
C. fermium
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which property would cesium most likely have? it is hard. it is ductile…
B. It is ductile.
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how was the work of newlands similar to that of mendeleev on the period…
They both arranged the elements in order of increasing atomic mass.
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how did moseley establish a more accurate periodic table? by arranging …
by arranging the elements according to atomic number instead of atomic mass
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which element is classified as a noble gas? o o o n o cl o xe
Xe.
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which is another name for groups of elements? actinides families haloge…
B. families
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which scientist established the law of octaves? antoine lavoisier dmitr…
D. John Newlands
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how did the work of dmitri mendeleev differ from that of john newlands …
Mendeleev predicted elements that would later be discovered.
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use the periodic table to select the element that best fits each of the…
- Which element below is least reactive? Iodine (assuming no noble gases are in the list) - Which element below must be stored in oil because of its reactivity? Calcium
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use the periodic table to select the element that best fits each of the…
1. nickel chloride 2. nitrogen and phosphorus
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use the periodic table to select the element that best fits each of the…
B. nickel chloride
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use the periodic table to select the element that best fits each of the…
1. Which element below has properties of both metals and nonmetals? Boron 2. Which element below is the most reactive? Chlorine
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use the periodic table to select the element that best fits each of the…
D. boron
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use the periodic table to select the element that best fits each of the…
Metalloid (semimetal): germanium Lanthanide: promethium
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use the periodic table to select the element that best fits each of the…
germanium
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use the periodic table to select the element that best fits each of the…
Noble gas: krypton A group 5A element: arsenic
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use the periodic table to select the element that best fits each of the…
C. krypton
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use the periodic table to select the element that best fits each of the…
Alkali metal: lithium Halogen: fluorine
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use the periodic table to select the element that best fits each of the…
C. lithium
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what is the correct chronological order of scientists contributing to t…
1. B. Lavoisier, Dobereiner, Newlands, Mendeleev, and Moseley 2. B. atomic mass
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what is an alloy? give an example. type your answer here open - ended q…
# Breve explicación: Un aleación es una mezcla homogénea de dos o más metales, o un metal y otro elemento, formada a altas temperaturas. Esto se hace para mejorar las propiedades …
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question 4 1 pts convert a density of 9.45 g/l to its equivalent in g/m…
0.00945
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question 2 1 pts directions for a lab require heating a reactant to a t…
$90.45$
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from the options provided for each element below, choose the properties…
Nickel (Ni): forms colorful compounds Neon (Ne): a gas
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from the options provided for each element below, choose the properties…
forms colorful compounds
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open - ended question what chemicals did egyptians use to paint the mur…
Los egipcios usaban pigmentos naturales como yeso, óxido de hierro, azurita y realgar, mezclados con un ligante como harina o huevo.
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from the options provided for each element below, choose the properties…
Magnesium (Mg): less reactive than sodium Fluorine (F): highly reactive nonmetal
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from the options provided for each element below, choose the properties…
less reactive than sodium
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the nonmetals include which of the following groups? use the periodic t…
- halogens - noble gases
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use the periodic table to classify each of the elements below. cadmium …
cadmium (Cd): Metal vanadium (V): Metal xenon (Xe): Non - metal iodine (I): Non - metal potassium (K): Metal strontium (Sr): Metal
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use the periodic table to choose the element that matches each descript…
halogen: One of F, Cl, Br, I, At group IIA: One of Be, Mg, Ca, Sr, Ba, Ra nonreactive: One of He, Ne, Ar, Kr, Xe, Rn alkali metal: One of Li, Na, K, Rb, Cs, Fr
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Mg: alkaline earth metal Ca: alkaline earth metal Cs: alkali metal
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open - ended question what was the first discovery, result of chemical …
# Breve explicación: Los primeros humanos experimentaron con la quema de materiales orgánicos, lo que es un ejemplo de reacción química. La combustión es una reacción química en l…
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Mg: alkaline earth metal Ca: alkaline earth metal
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use the periodic table to identify each of the elements below as an alk…
Rb: alkali metal Ca: alkaline earth metal
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use the periodic table to identify each of the elements below as an alk…
alkali metal
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which of these elements are you least likely to find in nature as a pur…
D. sodium (Na)
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use the periodic table to identify the name or atomic number for each e…
hafnium: 72 phosphorus: 15 rhodium: 45 osmium: 76 magnesium: 12
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use the periodic table to identify the chemical symbol or name for each…
zirconium: Zr rhenium: Re As: arsenic K: potassium tin: Sn yttrium: Y Yb: ytterbium
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from the list below, choose which groups are part of the periodic table…
metals, nonmetals, semimetals
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select the correct scientist for each of the following advances in crea…
Identified triads of elements with similar properties: Döbereiner Organized elements according to increasing atomic mass: Mendeleev
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select the correct scientist for each of the following advances in crea…
1. Johann Wolfgang Döbereiner 2. John Newlands 3. Henry Moseley
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why did mendeleev leave blank spaces in his version of the periodic tab…
Mendeleev’s periodic table arranged elements in order of increasing atomic mass; it was noticed that chemical properties repeated. Mendeleev predicted an element had not been disc…
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5. how does victor describe his childhood and early interests? a. troub…
5. C. Idyllic childhood with a fascination for science and alchemy. 6. A. Victor is drawn to science, Henry to chivalry and moral questions. 7. C. He moves from ancient alchemy to…
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which of the following did antoine lavoisier correctly characterize as …
1. C. mercury 2. A. light
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what block does sodium belong to?
s - block
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how many orbital blocks are represented in this periodic table? done
4
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room temperature is around 25°c. what is the state of matter of bromine?
Liquid
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what is silicon used for? matches gunpowder glass steel can coating
glass
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use the periodic table in the tools bar to answer the following questio…
What elemental classification does oxygen belong to? nonmetal What is the boiling point of gold? 2970°C What is silicon used for? Semiconductor devices in electronics
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use the periodic table in the tools bar to answer the following questio…
Non - metal
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nitrogen dioxide is a gas that can be generated by emissions from vehic…
D. A brown gas is produced.
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students mixed two liquids in a beaker and listed their observations. l…
D. The two liquids form a new substance.
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exercise 3: chemical reactions in aqueous solutions directions: downloa…
1a. Products: \(AgBr(s)+NaNO_3(aq)\), Precipitate: \(AgBr\), Spectator ions: \(Na^+\), \(NO_3^-\), Net ionic equation: \(Ag^+(aq)+Br^-(aq) ightarrow AgBr(s)\) 1b. Products: \(Zn_3…
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part 4 - particle model diagrams (10 minutes) instructions: working at …
- Review your model of Element. Explain, in terms of atoms, why your model represents an element. This model is an element because it contains only one - type of atom. - Review yo…
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instructions: based on the text regarding dalton and jj thomson, work w…
**Dalton’s Atomic Theory - Unique Details**: Atoms are solid, indivisible spheres; atoms of different elements have different masses. **JJ Thomson’s Atomic Theory - Unique Details…
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coordinating conjunctions complete the sentences using the coordinating…
1. but 2. and 3. or 4. so 5. for 6. nor 7. and 8. for 9. so 10. but 11. or 12. nor 13. but 14. for 15. and 16. so 17. or 18. but 19. nor 20. for 21. nor 22. so
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which statement explains why hydrogen bonds are able to form between wa…
Water molecules are polar.
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what are indicators? chemical compounds used to detect the presence of …
chemical compounds used to detect the presence of other compounds
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sep use models choose an element from the periodic table. describe all …
For an element like hydrogen (H) from the periodic table, we can learn its symbol (H), atomic number (1), group number (1), and that it has a single electron in its out - most she…
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metals, nonmetals, and metalloids elements are broadly classified as me…
Semiconductors are likely to be found in the area of the periodic table where metalloids are located, in a zig - zag pattern between metals and nonmetals. This is because metalloi…
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16. provide 3 missing symbols and 2 numbers 16 n + 4 2 → 9 + 1 0
The three missing symbols are \(_{7}\), \(_{2}\), \(_{3}\); the two missing numbers are 7, 3.
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question 1 mark this question meredith created organic soaps and lotion…
D. Point - of - sale terminal
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element write the noble gas notation electron configurations noble gas …
Krypton: \([Ar]3d^{10}4s^{2}4p^{6}\) Silver: \([Kr]4d^{10}5s^{1}\) Selenium: \([Ar]3d^{10}4s^{2}4p^{4}\) Oxygen: \([He]2s^{2}2p^{4}\) Scandium: \([Ar]3d^{1}4s^{2}\) Lithium: \([He…
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christian manages a team of scientists for a large chemical company. ev…
B. Leading
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states of matter phet simulation directions: 1. open the phet simulatio…
| Solid | Liquid | Gas | |--|--|--| | The ice is in a rigid state. | The ice became a liquid at 0°C. | The water became a gas at 100°C. | | The molecules are in a fixed, ordered p…
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which of the following best illustrates green marketing? a company clai…
C. A company promoting how well its detergent product cleans using cold water while emphasizing the environmental benefit
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if the change in mass of a metal salt is negative, which of the followi…
a) The salt is diamagnetic and the metal ion is repelled by the external magnetic field
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3. if the temperature of 34.4 g of ethanol increases from 25 °c to 78.8…
Question 3: Approximately $4507.7\ J$ Question 4: Approximately $300.0\ J$ (heat loss) Question 5: Approximately $32284\ J$ (heat loss)