Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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fill in the missing information: | element name | element symbol | | --…
| element name | element symbol | |--------------|----------------| | calcium | Ca | | Hydrogen | H | | oxygen | O | | mercury | Hg | | Copper | Cu | | gold | Au |
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multiply or divide the following measurements. be sure each answer you …
\( \frac{\text{m}}{\text{s}} = 4.586 \) ### Second Calculation: \( \frac{20.947\ \text{mol}}{\text{L}} \times 50.\ \text{L} \)
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set 3 a. reading read the warnings. then answer the questions. #1 conta…
a) allergy warnings ### Question 2
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add or subtract the following measurements. be sure each answer you ent…
1. \( 10.9 \, \text{mL} \) 2. \( 21.17 \, \text{mL} \) 3. \( 26.22 \, \text{mL} \)
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the symbol of an unprefixed scientific unit has been left off of each m…
- the volume of soda in a sixpack = 1.2 $\boldsymbol{L}$ - the minimum mass of an official Major League baseball = 142 $\boldsymbol{g}$ - the length of a car = 5. $\boldsymbol{m}$…
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the symbol of an unprefixed scientific unit has been left off of each m…
- the width of a football field = 48. $m$ - the volume of water in a tall glass = 0.5 $L$ - the mass of a newborn baby = 3000. $g$ - the height of a typical room ceiling = 3. $m$
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a chemistry student needs 80.0 g of acetone for an experiment. by consu…
101 mL
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a chemistry student needs 55.0 ml of ethanolamine for an experiment. by…
56.1
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a physical chemist measures the temperature t inside a vacuum chamber. …
215.216
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an organic chemist measures the temperature t of a solution in a reacti…
280.425
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next, the chemist measures the volume of the unknown liquid as 0.912 l …
\(0.789\space g\cdot cm^{-3}\) For the second part (identifying the liquid): Looking at the table, the density of acetone is \(0.79\space g\cdot cm^{-3}\), and our calculated dens…
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complete the table below. 2 mg = □ g □ ms = 5 s 600 cl = □ l □ dm = 5 m
2 Mg = 2000000 g 5000 ms = 5 s 600 cL = 6 L 50 dm = 5 m (The boxes should be filled with 2000000, 5000, 6, 50 respectively)
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a nuclear chemist measures the mass of an artificial element. the mass …
\(4.9\times10^{-11}\)
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10. ____ secl₆ + ____ o₂ → ____ seo₂ + ____ cl₂
1, 1, 1, 3 (The coefficients for \( \text{SeCl}_6 \), \( \text{O}_2 \), \( \text{SeO}_2 \), \( \text{Cl}_2 \) respectively)
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a chemist needs to know the mass of a sample of potassium sulfate to 6 …
\(41.0400\)
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module 5 periodicity you should be able to - use the periodic table to …
1. Ne: 8; S: 6; Mg: 2; Sn: 4; C: 4; Al: 3; Te: 6; Cs: 1; Bi: 5; Br: 7; Ga: 3; P: 5 2. Ne: 2; S: 3; Mg: 3; Sn: 5; C: 2; Al: 3; Te: 5; Cs: 6; Bi: 6; Br: 4; Ga: 4; P: 3 3. W: M; S: N…
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count the significant digits in each of these measurements: measurement…
s: For \( 0.009700 \, \text{J} \): 4 For \( 4.0\times10^{-1}\, \text{mL} \): 2 For \( 37000. \, \text{kg} \): 5 For \( - 8.0\times10^{-1}\, \text{kJ/mol} \): 2
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complete each row of the table below by filling in the missing prefix o…
First row: prefix = n (nano), so 1 nmol = \(10^{-9}\) mol Second row: exponent = -3, so 1 mmol = \(10^{-3}\) mol Third row: exponent = -2, so 1 cmol = \(10^{-2}\) mol Fourth row: …
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5. from \potential energy\...what is chemical potential energy? (6 poin…
5. the energy stored in substances as a result of their chemical bond 6. larger; higher off
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3. from \potential energy\. what is the relationship between potential …
3. Inversely related 4. energy that is stored in materials like springs or rubber bands that are stretched or compressed
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sophia adds water to a beaker of motor oil. after the liquids settle, t…
sinks below . . . more
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14. from \mechanical energy\... the sum of the kinetic and potential en…
14. mechanical energy 15. chemical energy
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16. from \mechanical energy\... when you hit a hammer with a nail, you …
16. kinetic energy 17. movement of the nail deeper into the wood
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read the excerpt from the environmental ethic. it is fashionable in som…
A. All species are worth protecting because even the small organisms contribute important functions in the environment.
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read the excerpt from steven d. levitt and stephen j. dubner’s freakono…
A wrestler near the top of this elite pyramid may earn millions and is treated like royalty.
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que carga electrica tendra neon (ne)? ninguno +8 rewatch
Ninguno
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que carga formara fosforo (p)? -3 +5 rewatch
- -3 - +5
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que carga tendra potasio (k)? □ +1 □ -1 rewatch
+1
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cual es la diferencia entre los iones de los metales y no-metales? meta…
Metales forman + No metales forman -
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make the following mole conversions - show all work in space below and …
15.9 g ### Question 34:
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multiple-choice question porque litio forma un ion de +1? porque su gat…
Porque tiene un electron de valencia y es mas facil perder 1 que ganar 7.
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write the formula for the following ionic compounds: 17. potassium brom…
\(KBr\) ### 18. Calcium sulfate
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calculate percent by mass/percent composition. 32. a. na₂so₄ b. k₃po₄ c…
s: a. $\ce{Na}$: ~32.4%, $\ce{S}$: ~22.5%, $\ce{O}$: ~45.1% b. $\ce{K}$: ~55.2%, $\ce{P}$: ~14.6%, $\ce{O}$: ~30.2% c. $\ce{Al}$: ~23.1%, $\ce{C}$: ~15.4%, $\ce{O}$: ~61.5%
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write the formula for the following ionic compounds: 17. potassium brom…
$\text{KBr}$ ### Question 18: Calcium sulfate
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10. the volume of solid ice is about 110% the volume of liquid water. w…
The volume of ice created is 825 mL.
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blow out the cobwebs review 1. sketch and label particle diagrams to il…
$NBr_3$ ### Question 4:
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what addition information is needed to convert an empirical formula cal…
D. Molecular weight of the compound
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how is molecular formula related to empirical formula? it is equal to t…
D. It can be equal but it is usually a simple integer multiple of the empirical formula
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what is the empirical formula of a hypothetical compound that is 96% s …
$\boldsymbol{S_3H_4}$ (Option C)
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effects of cannabis on the body & brain review the infographic to the l…
1. Weakened Immune System: Long-term THC exposure suppresses the immune system, making individuals more vulnerable to infections. For communities, this drives higher rates of tran…
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question 3 1 pts how is an empirical formula calculation related to a p…
○ They are exactly the reverse of each other in terms of math steps
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question 1 1 pts what is the ratio of atoms in the compound hcl? 1 to 1…
1 to 1
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how many atoms of oxygen are there in a 2 moles of oxygen molecules?\ o…
$12 \times 10^{23}$ and $24 \times 10^{23}$ (corresponding to the last option in the provided choices)
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question 7 1 pts diatomic elements are important. what makes them diffe…
The atoms are found in pairs in nature.
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question 6 1 pts why is it possible to do compositional stoichiometry p…
All are correct
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how many grams of oxygen are in a sample of carbon dioxide (co₂) that h…
64 grams
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question 4 1 pts if there are 12 × 10³⁵ oxygens in a sample of water, h…
4 grams
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how many grams of carbon are in $12 \\times 10^{24}$ atoms of carbon? \…
24
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what is formed when natural materials undergo a chemical reaction? the …
C. a new material
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multiple choice question what is formed when natural materials undergo …
C. a new material
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fill in the blank question synthetic materials are made from natural ma…
chemical reactions (or "a chemical process" can also be acceptable, but "chemical reactions" is more precise for the context of material synthesis from natural materials)
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fill in the blank question when natural materials undergo a blank blank…
chemical change
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multiple choice question what is formed when natural materials undergo …
a new material
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fill in the blank question a polymer chain is made up of need help? rev…
monomers
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for an experiment, the student needs 25 ml of 85% phosphoric acid. howe…
A. Pour the excess into the “Chemicals for Disposal” beaker.
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which of the following items on the lab bench could be spilled on stude…
D. Chemical substances in dropper bottles and test tube
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color by number conservation of matter directions: the law of conservat…
1. Yes (white) 2. No (red) 3. No (orange) 4. Yes (green) 5. Yes (sky blue) 6. No (black) 7. Yes (sky blue) 8. Yes (purple) 9. No (light sky blue) 10. No (light purple) 11. Yes (re…
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boiling point & solubility data (imf reasoning) properties of three com…
Ammonia ($\ce{NH_3}$) has the highest boiling point with a boiling point of $-33.2^\circ\text{C}$. If the question was about solubility, the highest solubility is 72 g (Hydrogen C…
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temperature change & intermolecular forces (simulated \specific heat\ c…
For Water, \( \Delta T = 8.0^\circ\text{C} \); For Paraffin, \( \Delta T = 19.0^\circ\text{C} \) Filling the table: | Liquid | Initial Temp (\(^\circ\text{C}\)) | Final Temp after…
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13. what is the bond type of nacl. explain.
The bond type of NaCl is an ionic bond. Sodium (a metal) transfers one electron to chlorine (a non - metal), forming $Na^+$ and $Cl^-$ ions. The electrostatic attraction between t…
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pop goes the weasel or offenbachs \can - can\ can be used to create son…
Naughty Mary Ate Silly Pears Soup Clam Arg King Cake (corresponding to Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca)
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periodic table of the elements quiz name: fill in the blanks with the a…
To solve this, we recall the first 20 elements of the periodic table (by atomic number): 1. Atomic number 1: **Hydrogen (H)** 2. Atomic number 2: **Helium (He)** 3. Atomic number …
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7. which liquid is likely to be a solvent for table salt (nacl)? a. wat…
a. Water ### Question 8
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12. the table shows the melting points to the nearest degree celsius fo…
Nitrogen and Ammonia
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how many protons, neutrons and electrons does a neutral atom of sodium …
One atom of Sodium has 11 protons, 12 neutrons, and 11 electrons.
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how many electrons maximum can fit in the first every level of an atom?…
2
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determine what element matches the following numbers of particles given…
- 26 electrons, 29 neutrons, 26 protons: Iron (Fe) - 53 protons, 74 neutrons: Iodine (I) - 2 electrons (in a neutral atom): Helium (He) - 20 protons: Calcium (Ca)
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determine the number of neutrons in one atom of nickel. **you must roun…
31
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determine the number of neutrons in one atom of magnesium. **you must r…
Magnesium has 12 neutrons. Europium has 89 neutrons.
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question 59 of 100 for which client is hair molding the best setting te…
a client with mid-length, chemically relaxed hair
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determine the number of neutrons in one atom of carbon. **you must roun…
Carbon has 6 neutrons. Hydrogen has 0 neutrons.
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determine the number of neutrons in one atom of barium. **you must roun…
81
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match the element to its correct element symbol. uranium ur chlorine ch…
Uranium → U Chlorine → Cl Boron → B Xenon → Xe
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question 8 (1 point) a cheerleader is thrown vertically upward into the…
a. gravitational potential energy ### Question 9
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which of the following best describes surface mining? removing the eart…
removing the Earth's surface to extract resources
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what letter is pointing to the name of the element? carbon ← a 6 ← b c …
A
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what letter is pointing to the atomic symbol? carbon ← a 6 ← b c ← c 12…
C. C
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what letter is pointing to the atomic weight? carbon 6 c 12.011 a b c d…
D
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what letter is pointing to the atomic number? carbon a 6 b c 12.011 d d…
B. B
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question 47 of 100 which part of the hair shaft plays an important role…
hair cuticle
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question 45 of 100 which of the following statements best explains why …
Being able to change the texture of a client’s hair is necessary in order to style hair effectively.
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question 37 of 100 perm wave applications work primarily by means of __…
chemical solutions
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\matter cannot be created nor destroyed\ forms the basis of which of th…
The Law of Conservation of Matter
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which best models the products of the neutralization reaction? cl h + n…
The correct model should show water (\( \text{H}_2\text{O} \)) and sodium chloride (NaCl). If the only option with water is paired with a compound that should be NaCl (even if lab…
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a client whose hair has been previously lightened (bleached) comes into…
The stylist should proceed with the service only after conducting the patch test.
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6. the most common foodborne illnesses are caused by ______. overcooked…
B. bacteria and viruses
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(02.01 mc) which of the following best explains how water is able to di…
The positive and negative charges of the water molecule attract the negative and positive ends of the molecule to break them apart.
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question 1 (02.01 lc) the slight negative charge at one end of one wate…
A. A hydrogen bond
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section g: atomic structure identification instructions: for each eleme…
Protons: 6, Neutrons: 6, Electrons: 6, Mass Number: 12 ### 26. Oxygen - 16
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define the terms limiting reactant and excess reactant in your own word…
### Part 1: Define Limiting and Excess Reactant #### Limiting Reactant In a chemical reaction, the limiting reactant is the substance that gets completely used up. Once it’s all c…
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period: section a: groups in the periodic table (multiple choice – 5 qu…
a. Group 1 (Alkali Metals) 2.
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grade 11 chemistry scn3u test 5: stoichiometry name: | knowledge /13 | …
**: True (T) 2. **Explanation**: The limiting reactant (not excess) determines the amount of product formed.
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2. what does a chemical family have in common?
Elements in a chemical family (group) have the same number of valence electrons, leading to similar chemical properties (e.g., reactivity, ion formation) and often show trends in …
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review #3 1. give one example from each of these families: alkali metal…
alkali metals - Lithium (Li) alkaline earth metal - Magnesium (Mg) halogen - Chlorine (Cl) noble gas - Neon (Ne)
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homework 15 - 01/07/2026 question 5. the formula for the compound trica…
$\boldsymbol{C_3Br_6}$ (the fourth option)
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write formulas for the following binary molecular compounds: a) xenon t…
a) $\text{XeF}_4$ b) $\text{S}_2\text{F}_{10}$ c) $\text{IF}_7$ d) $\text{SO}_3$ e) $\text{N}_2\text{O}$ f) $\text{B}_5\text{H}_9$
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step 1: study this content. you need to be able to demonstrate that you…
A substance that donates hydrogen ions (\(H^+\)) in solution. A substance that donates hydroxide ions (\(OH^-\)) in solution. A pH value of 7, indicating a balance between \(H^+\)…
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step 1: study this content. you need to be able to demonstrate that you…
- Acid: A substance that donates $H^+$ ions, has pH < 7 (e.g., $HCl$). - Base: A substance that accepts $H^+$ or donates $OH^-$, has pH > 7 (e.g., $NaOH$). - Neutral pH: pH = 7 (p…
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question 2 the concentration of lioh is 8.9 x 10⁻⁶ m. what is the poh? …
5.05 (corresponding to the option "5.05") ### Question 3
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quiz instructions question 1 is lioh an acid or a base? acid base quest…
B. Base