Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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• an example of a chemical property is related content chemical changes…
flammability
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complete the following statements. • the chemical properties of a subst…
- The chemical properties of a substance can be observed $\boldsymbol{\text{only by}}$ changing the identity of a substance. - An example of a chemical property is $\boldsymbol{\t…
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chemotherapy and radiation is used to treat which disease? a. schizophr…
B. Cancer
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which of the following is not an example of a chemical property? choose…
C. Iron is magnetic.
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in the second column, write the name of each whmis symbol. then choose …
1. Name of the symbol: Corrosive; What the symbol means: Will corrode substances with which it comes in contact, including human flesh 2. Name of the symbol: Health Hazard; What t…
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what is the atomic number of mg²⁺? a 12 b 24 c 25 d 55 question 28 what…
A. 12 ### Second Question (Atomic number of $\boldsymbol{\ce{Na^{+}}}$)
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isotopes of an element always have the same a mass number b number of n…
D. Atomic number ### Question 39 (Atomic structure formula)
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page 2 – states of matter matter exists in different forms called state…
The three most common states of matter are solid, liquid, and gas. In a solid, particles are packed tightly together and have a definite shape and volume. In a liquid, particles a…
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question 2 a researcher combines three liquid samples with the volumes …
The total volume of liquid the researcher has is approximately \(2.54\space L\) (or more precisely \(2.537205\space L\)) after converting all volumes to liters and summing them: \…
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page 3 – atoms & elements all matter is made of tiny particles called _…
1. atoms 2. nucleus; protons; neutrons 3. electrons 4. atom; atom 5. elements; hydrogen; oxygen 6. physically; chemically combined; homogeneous; heterogeneous
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what is rhyme scheme? (1 point) several words in a short section beginn…
B. the pattern of rhyming words at the end of each line in a poem
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which of the following solutions uses sugar as the base and tends to be…
B. Syrup
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use the stanzas to answer the question. what is the rhyme scheme of the…
D. abbabb (assuming the last option is D; if the options are labeled as A: abcabc, B: abccba, C: abaaba, D: abbabb, then the answer is D. abbabb)
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lab safety n c l e a n u p s h r e n m p f r b z n q l e p l a c s t d …
The subfield for this lab safety - related problem is Natural Science: Biology, Chemistry, Physics, Medicine and Health, Nursing, Geography, Engineering, Computer Science, Environ…
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which piece of text uses this definition of promotion? promotion (noun)…
Naomi works for an organization that is dedicated to the promotion of math and science education for girls. She runs a summer camp that teaches girls about chemistry and engineeri…
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which of these are fundamentally electric potential energy, when consid…
A. chemical potential energy, C. elastic potential energy
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tablet 25 water 10 baggie 4 total 39\ttotal 38 matt and juan are studyi…
D. Some gas escaped from the baggie before the boys had it completely closed
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19. explain how temperature affects the rate of sugar dissolving in wat…
Higher temperature increases the rate of sugar dissolving in water by increasing molecular kinetic energy (more frequent, energetic collisions); lower temperature decreases the ra…
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tablet 25 water 10 baggie 4 total 39\ttotal 38 matt and juan are studyi…
C. Some of the water evaporated and could not be massed as a product in the reaction
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18. how many atoms total are in the formula nacl?
2
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chemical and physical changes part b while studying chemical and physic…
D (assuming the full option D states: "No, it is a physical change. A chemical change forms a new substance, but dissolving salt only mixes it with water; the salt can be recovere…
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chemical and physical changes 1. images: i (pipes exposed to air for si…
D. The pipes in image I are going through a chemical change called rusting; the evidence is the color change
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17. identify whether each is a physical or chemical change: a. ice melt…
a. Ice melting: Physical change ### Part b: Wood burning
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16. true or false: hcl is a compound.
True
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i. a chemical change breaks bonds, forms new substances and is irrevers…
A. I & III
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15. match each method to its effect: a. stirring b. heating c. crushing…
a. Stirring - 2. Moves solute around faster b. Heating - 1. Adds energy to particles c. Crushing - 3. Increases surface area
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color change formation of a gas temperature change density melting poin…
A. flammability
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which of the following guidelines should a pharmacy technician consider…
B. Use the smallest device that will accommodate the liquid. ### Second Question (Disposal in Normal Trash) (Note: Since the options are partially visible, we assume based on phar…
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12. is lemonade a solution? explain.
Yes, lemonade is a solution. It is a homogeneous mixture where solutes (e.g., sugar, lemon juice components) are dissolved in a solvent (water), resulting in a uniform composition…
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picture d represents the only possible option as the correct products. …
D. Picture D rearranges the atoms whereas A, B, and C did not
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9. which of the following tables represents data that have a proportion…
B ### Question 10
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11. what happens to concentration if you add more water to a sugary dri…
When more water is added to a sugary drink, the concentration of the sugar (solute) in the drink (solution) decreases (the drink becomes more diluted).
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sara is making an omelet. she cracks open 6 eggs and places them in a b…
A. cutting pepper, B. cutting onion, D. mixing eggs
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10. in a saltwater solution, which is the solute? which is the solvent?
Solute: Salt (sodium chloride, \( \text{NaCl} \)) Solvent: Water (\( \text{H}_2\text{O} \))
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chunk 1: tom and the fence tom appeared on the sidewalk with a bucket o…
The mood is gloomy and burdensome. The author creates it by describing Tom's feelings (life hollow, existence a burden) and his task (whitewashing, a chore), using somber language…
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10. in a saltwater solution, which is the solute? which is the solvent?…
Solute: Salt (Sodium Chloride, \( \text{NaCl} \)) Solvent: Water (\( \text{H}_2\text{O} \)) ### Question 11:
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3. fill in the blank: an element is made of only one kind of blank. 4. …
atom ### Question 4
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atomic structure worksheet fill in the blanks for the elements in this …
To solve the atomic structure worksheet, we use the following concepts: - **Atomic Number (Z)** = Number of Protons = Number of Electrons (in a neutral atom). - **Atomic Mass (A)*…
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in your lab group you combined vinegar and baking soda and observed the…
A. A gas is produced, C. Bubbling occurred, E. There is a change in the composition of the reactants
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chemical and physical properties which image(s) shows a physical proper…
A. I, B. II, C. III
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1. compare a molecule of oxygen (o₂) and a molecule of water (h₂o) 2. w…
B) \(CO_2\) ### Question 3
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examine the image and assess the relationship of the atoms shown by: ch…
A. The rearrangement of atoms is a chemical change.
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5. which compound is used as an antacid to neutralize excess stomach ac…
c) $\ce{Mg(OH)_{2}}$
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8. give the symbol and number of electrons in a neutral atom of: uraniu…
### Question 8 To solve for the symbol and number of electrons in a neutral atom, we use the fact that in a neutral atom, the number of electrons equals the number of protons (ato…
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d) phenacetin 3. which artificial sweetener is used by diabetic patient…
a) Saccharin ### Question 4
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prepare for lab - always use ________ in the lab. - handle chemicals __…
This worksheet is about lab safety, which falls under the Natural Science discipline, specifically in the subfield of a general lab safety context (related to experimental science…
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1. which chemical is commonly used in toothpaste to prevent tooth decay…
c) Fluoride compounds ### Question 2
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barbara completed an assignment for extra credit in science class. she …
A. to the left of cola
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1. an example of a physical property is ______ a. flammability b. abili…
d. State of matter ### Question 2
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question 1 points 1 ______ is rarely found in a gaseous state. phosphor…
B. Carbon
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16. draw the lewis dot structure for each of the elements and identify …
| ATOM | Lewis Dot Structures | # of lone pairs | # of bonding electrons | |----------|----------------------------|-----------------|------------------------| | bromine | \(\cdot…
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7. __ hcn + __ cuso₄ → __ h₂so₄ + __ cu(cn)₂ 8. __ gaf₃ + __ cs → __ cs…
Let's solve these chemical equations by balancing them one by one. We'll use the method of balancing atoms on both sides of the equation. ### Problem 13: $\boldsymbol{AlBr_3 + K_2…
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layers of the earth chemical layers - physical layers what layer drives…
### 1. Chemical Layers of Earth The Earth’s chemical layers are based on **composition**: - **Crust**: Outermost, thin layer (continental: granite, oceanic: basalt). - **Mantle**:…
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cambridge pre-aice french language 2 igcse level - carder - p01 - s01 k…
**A. une casquette ### Question 4 (assuming "identify feminine noun"): - *une jupe* (feminine, "a skirt") - *un chemisier* (masculine, "a blouse/shirt") - *une chaussure* (feminin…
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scr (answer with ~30 words / 2-3 sentences) 1. how can you tell the dif…
Un cambio químico forma una nueva sustancia (ej: oxidación), mientras que un cambio físico mantiene la sustancia original (ej: fusión).
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drawing prompts 1. draw a before-and-after picture of a nail rusting. l…
To draw the before - and - after of a nail rusting (chemical change): - **Before**: Sketch a shiny, smooth iron nail (label: "Before - Iron Nail (Fe)"). - **After**: Sketch the na…
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4. why is baking a cake considered a chemical change? a) the cake batte…
b) A new substance with new properties is formed
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1.the 3 particles of the atom are: a. b. c. their respective charges ar…
a. Proton b. Neutron c. Electron Their respective charges are: a. Positive (+) b. Neutral (no charge) c. Negative (-) ### Question 2
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in chemistry, logarithms are key to calculating the ph of a solution. i…
D. \( H^+ = 10^{-2.6} \) (and also C. \( H^+ \approx 10^{-3} \) is a reasonable approximation, but the exact answer from the formula is \( H^+ = 10^{-2.6} \)) Wait, the options ar…
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3. what type of change in matter happens when your body breaks down the…
b) chemical change
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2. which is not a characteristic of chemical changes in matter? a) ligh…
b) The matter remains unchanged
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aice french language 2 igcse level - carder - p01 - s01 > launch vhlcen…
To solve this fill - in - the - blank exercise in French, we analyze the context and the meaning of each word: ### (2) Maria is looking for a piece of clothing. Among the options,…
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multiple choice questions 1. what is a characteristic of a physical cha…
b) The composition is unchanged
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practice: balancing equations #2 show all work on a separate sheet of p…
The balanced equation is \( \boldsymbol{1}\text{Pb(OH)}_2 + \boldsymbol{2}\text{HCl} ightarrow \boldsymbol{2}\text{H}_2\text{O} + \boldsymbol{1}\text{PbCl}_2 \) (coefficients: 1, …
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a student wants to conduct an investigation that will determine a physi…
D. 1. Place the sample in a resealable, zip - top bag; 2. Firmly close the zip - top bag; 3. Lightly tap the sample with a hammer; 4. Observe if the sample dents, breaks, or shatt…
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1. djamila veut acheter (1) blank pour aller à la plage en côte dazur, …
(1) un maillot de bain (2) soldes (3) couleurs (4) chers (5) chemisier (6) une jupe (7) un maillot de bain (8) une vendeuse
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the law of conservation of mass tells us that the total number of atoms…
A. \( 4NH_3 + 5O_2 ightarrow 4NO + 6H_2O \) B. \( 8H_2S + 8Cl_2 ightarrow S_8 + 16HCl \) E. \( 2Al(OH)_3 + 3H_2SO_4 ightarrow Al_2(SO_4)_3 + 6H_2O \)
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a flask with vinegar in it has a mass of 160 grams. a balloon with baki…
B. 200 grams, because all the atoms remain in the balloon or flask.
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ethanol is a chemical that is used in many hand sanitizers. it is produ…
s: - H: 12 - C: 4 - O: 2 - Ethanol molecules: 2
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sulfuryl chloride is a substance used to make chemicals for killing ins…
### Part 1: Completing the table (for O, S, Cl atoms) #### Step 1: Analyze Oxygen (O) atoms - From \( SO_2 \): Each \( SO_2 \) has 2 O atoms, and there are 2 \( SO_2 \) molecules.…
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hydrogen peroxide can be used to disinfect and clean surfaces around th…
s: - Number of H atoms: \( 12 \) - Number of O atoms: \( 12 \) - Number of H₂O₂ molecules: \( 6 \)
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in what way are the lines of \the weary blues\ similar to the lyrics of…
The poem uses repetition to create meaning.
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what is eutrophication? a process that removes nutrients from water bod…
# Breve explicación: La eutroficación es el crecimiento excesivo de algas y otros organismos acuáticos debido a la presencia excesiva de nutrientes, como nitratos y fosfatos, en c…
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ch₃ch₂ch₂ch₂ch(ch₃)br o 1° o 2° o 3° part 2 of 3 br o 1° o 2° o 3° part…
Part 1: 2° Part 2: 1° Part 3: 1°
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which website citations are formatted correctly? select three options. …
B. Greene, Tom. Home Composting. Hanover Growers Guild, 15 March 2010. Web. 22 April 2011. D. Lee, Kim. Stake Your Tomatoes. Future Farmers of America, n.d. Web. 24 June 2012. E. …
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he established the theory of electrolytic dissociation, supplying a rea…
Insoluble
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question 6 1 pts sample question 2: tests application of a concept cove…
D. 3
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which of the following statements about chemical bonds is false? a. ato…
B. Electron sharing forms both ionic and covalent bonds.
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let a bottle of salad dressing stand on the table for a few hours and y…
insoluble
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calculate the hydrogen ion concentration, h+, of an acid with a ph of 5…
$1.58\times10^{-6}$
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question 10 1 pts how many hydrogen atoms are in 0.62 g of propane, c₃h…
$6.8$ $22$
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how many formula units (ionicmolecules) of mercury(i) perchlorate, hg₂(…
$1.25$ $21$ ### Question 8
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how many molecules of tartrazine, na3c16h9n4o9s2, are in 0.631 mol of t…
$3.79$; $23$ ### Question 5
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what is the common name of ch3(ch2)2 - o - (ch2)2ch3? propyl propyl eth…
B. dipropyl ether
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what amount (in mol) of formula units (ionicmolecules) are in 15.8 g of…
Question 1: 0.0842 Question 2: 36.4 Question 3: 1.11, 24
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what alcohol would be oxidized to form the compound below? none of the …
$\begin{array}{c}CH_3\\|\\CH_3 - C - CH_2 - OH\\|\\CH_2CH_2CH_3\end{array}$
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what is the structure of 1 - chloro - 3 - ethyl - 2 - heptanol? questio…
(Assuming the first correct - looking structure among the options based on the above - described structure analysis. Since the options are not clearly numbered, you need to visual…
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what is the iupac name of the compound below? 2,6 - dihydroxytoluene 1 …
First question: C. 2 - methyl - 1,3 - cyclohexanediol Second question: The first structure shown for the second - part (with Cl at the 1 - position, ethyl at the 3 - position and …
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molecules are attracted to one another by van der waals forces. how do …
B. Van der Waals forces are weaker than ionic and covalent bonds.
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which is an example of an ether? question 12 (10 points) what is the iu…
The example of an ether is the fourth structure. 2 - methyl - 1,3 - cyclohexanediol
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how does a molecular compound compare to the elements that make up the …
D. The properties of a compound are usually very different from the properties of the elements that make it up.
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which compound can be oxidized to a carboxylic acid?
The compound with the structure $\text{R}-\text{CH}_2\text{OH}$ (the fourth option in the image)
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fill in the missing words a) in an o-h bond a partial negative charge r…
a) oxygen b) oxygen c) fluorine d) bromine e) chlorine
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the atomic number of carbon is six, which means that a carbon atom has …
B. All carbon atoms have six protons and six electrons; D. Atoms of some naturally occurring carbon isotopes may have six neutrons.
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deuterium is an isotope of hydrogen. it has a mass number of two. which…
A. a nucleus of one proton and one neutron, which is orbited by one electron
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when electrons transfer from one atom to another, both atoms become and…
First blank: Ions Second blank: Ionic Third blank: Covalent Fourth blank: Molecule
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step 3: write answers to the following questions. you must provide exam…
1. Solid: Closely - packed, regular pattern, vibrate in place (e.g., ice - cube). Liquid: Close together, can slide past each other (e.g., water in a glass). Gas: Far apart, move …
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fill in the missing words a) there are valence electrons in an h₂co mol…
a) 12 b) 48 c) 10 d) 8
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answer these questions based on your understanding of the properties of…
1. 1800 calories 2. 200 grams 3. 280 calories 4. 40 calories
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fill in the missing words particles with an odd number of valence elect…
1. free radicals 2. reactive 3. octet 4. duet