Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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phet: states of matter name introduction: there are more states of matt…
Spacing: Particles are closely packed with little space between them. Motion: Particles vibrate in fixed positions (no free translational movement). ### For Question 3 (Cooling a …
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question 12 1. iron has three main isotopes. fe-54, fe-56 and fe-57. th…
56.18 (or 56.179, depending on rounding. If we use more precise calculation, the average atomic mass of iron is approximately 55.85, but wait, maybe I made a mistake in the isotop…
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alkali metal with 4 energy levels alkaline earth metal with 2 energy le…
To solve this matching problem, we analyze each description using the periodic table rules (period = energy levels, group = column): ### 1. Alkali metal (Group 1) with 4 energy le…
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snc2p chemistry unit 2. classify the following as a homogenous or heter…
Homogeneous #### b) Cherry vanilla ice cream
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chemistry matter review practice 1. classify the following as an elemen…
To solve this, we recall the definitions: - **Element**: Pure substance with one type of atom (e.g., Fe, Ag, Ne). - **Compound**: Pure substance with two+ different atoms (e.g., N…
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period 5 & group 11 period 7 & groups 17 period 7 & group 1 period 6 & …
To solve this matching problem, we analyze each description using periodic table rules (period = energy levels, group = valence electrons, noble gases have full valence shells, gr…
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question 20 the name of co₂(so₄)₃ is blank 1. blank 1 add your answer
cobalt(III) sulfate
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question 18 the formula for calcium nitrate is blank 1. blank 1 add you…
$Ca(NO_3)_2$ ### Question 19
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part d 80.732 g sn express your answers using four significant figures …
$4.094\times 10^{23}$ atoms
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part c 22.867 g pt express your answers using four significant figures
\( 7.059 \times 10^{22} \) atoms
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part b 49.858 g s express your answers using four significant figures n…
$9.364\times10^{23}$ atoms
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question 3 of 10 read these lines: that conqueredst alexandria by the r…
B. abaaca
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blank 1 is the name of alpo₄. add your answer
Aluminum Phosphate
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complete the sentences. the number of protons in the fluorine atom is b…
The number of protons in the fluorine atom is \(\boldsymbol{9}\), the number of electrons is equal to the number of protons, so the fluorine atom has a \(\boldsymbol{neutral}\) ch…
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part a 20.690 g cr express your answers using four significant figures …
\( 2.398 \times 10^{23} \) (or if using 52.00 g/mol, 2.396 × 10²³, but the more accurate molar mass gives 2.398 × 10²³)
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which of the following is an example of an atom? * 1 point ○ hydrogen ○…
A. hydrogen
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which of the following is an example of a compound? * hydrogen ocean wa…
C. sodium chloride
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blank 1 is the name of nullo3. blank 1 add your answer
Sodium Nitrate
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complete the sentences. the number of protons in the fluorine atom is l…
equal to
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page(s) 45-46 3.1. compare and contrast the types of bonds that form mo…
The order from strongest to weakest is covalent, ionic, hydrogen. So the sequence is: covalent, ionic, hydrogen.
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based on what you’ve learned about what happens when water freezes, whi…
# Brief Explanations: 1. Analyze "Salt generates covalent bonds with water and prevents freezing": Salt (ionic compound) forms ionic interactions with water (polar), not covalent …
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todo lo que te rodea —tu escritorio, el aire que respiras, incluso tu p…
Los átomos son los bloques básicos de construcción de la materia; todo lo que te rodea (escritorio, aire, propio cuerpo, etc.) está compuesto de ellos, y son tan pequeños que no s…
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1. define the following terms: | state | definition | sketch of atomic …
To complete the "Sketch of Atomic Arrangement" column for each state of matter: ### Solid - **Explanation**: In a solid, atoms (or molecules) are closely packed in a regular, repe…
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page(s) 51-53 3.5. explain the difference between hydrophilic and hydro…
Hydrophilic: ions, polar molecules, NaCl Not Hydrophilic: nonpolar molecules
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possible carbon replacement drag appropriate answer(s) here capable of …
### Possible Carbon Replacement: - capable of forming a large number of bonds - can form bonds with many other atoms - can form long chains or rings with other atoms - prefers to …
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3.5. explain the difference between hydrophilic and hydrophobic molecul…
Correct Answer(s): The solution becomes less acidic. The pH increases. Incorrect Answer(s): The solution becomes more acidic. The pH decreases.
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3.6. predict whether a solution has a high or low concentration of free…
Lemon juice, because it donates more $\ce{H+}$ ions than orange juice.
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using only these supplies, which question can adele investigate with an…
Does milk chocolate melt faster when heated in a microwave or on a stove?
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inquizitive: chapter 3: chemistry of life: breaking good inquizitive ch…
- Water molecules with dashed lines: hydrogen - Middle electron - sharing image: covalent - Na⁺ - related image: ionic
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calculate the amount of heat needed to boil 75.8 g of ethanol (ch₃ch₂oh…
To solve this, we need the following data (assumed or standard values for ethanol): - Melting point of ethanol: \(-114^\circ\text{C}\) (but we start at \(-13.1^\circ\text{C}\), so…
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question 15 potassium has two main isotopes, k-39 and k-41. the average…
6.5
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chapter 3: chemistry of life: breaking good page(s) 56-58 3.6. predict …
1. washing soda with a pH of 8 - 10 2. milk with a pH of 6.5 3. a solution of $\ce{H_2SO_4}$ with a pH of 2
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in the poems, how does shakespeare allude to, or refer to, ovid’s poem?…
B. by personifying time as cruel and destructive
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a chemist puts 0.1 liters of liquid in each of 12 beakers. how much liq…
\(1.2\) liters
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identify the location where you would expect to find a substance with t…
The location with the lowest \(H^+\) concentration is at the top of the scale, corresponding to pH 14 (the blue - topped area or the position labeled 14).
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match the type of bond to its description. drag each item on the left t…
- covalent → atoms that share electrons - ionic → attraction of a negatively charged atom or molecule with a positively charged one - hydrogen → a partially positively charged hyd…
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lecture activity no. 1 since we only have a 1-hour class schedule, this…
The formula mass of $\ce{CaCl2}$ is $\boldsymbol{110.98\ \text{g/mol}}$. ### Question 3:
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complete each sentence with a word or words from the word bank. not all…
### Across 2. **Answer**: loosely **Brief Explanations**: In liquids, molecular packing is less tight (more loose) than in solids. 3. **Answer**: shape **Brief Explanations**: Liq…
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for each of the noted items on the ph scale, match the label that indic…
- \(10^+\) → Milk (6.5) - \(100^+\) → Natural rainwater (5.6) - \(1000^+\) → Tomatoes (4.5) - \(10,000^+\) → Oranges (3.5) (Other substances like lemons, stomach acid, seawater, b…
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mia is making a list of questions to compare properties of solids, liqu…
The property of a solid different from gas or liquid is: **"Does it have a shape of its own?"** (or "Does its shape depend on the container?"). Solids have a definite, independent…
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2. in a liquid, molecules are more ____ packed than in a solid.
loosely
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vaping can cause chemical burns in your lungs. true, vaping injury like…
True, vaping injury like chemical burns have been reported by doctors.
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complete each sentence with a word or words from the across 2. in a liq…
loosely 3. **Explanation**: Liquids have no fixed shape (they take container’s shape).
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diacetyl is... ○ ...an ingredient in vape juice that is not good to inh…
C. ...an ingredient that is considered safe in some foods to eat, but is not safe to inhale into the lungs. (Here we assume the options are labeled A, B, C, D in order, so the cor…
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complete each sentence with a word or words from the word bank. not all…
### Across 2. **loosely** (Liquids have molecules less tightly packed than solids, so "loosely" fits as they are more loosely packed than solids? Wait, no—wait, solids are tightly…
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select which statements are true and false about mendeleev and the deve…
- Mendeleev organized elements by atomic weight: True - Mendeleev was the only person to develop a periodic table: False - Mendeleev’s table was complete: False - Mendeleev invent…
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tu mélanges 200ml dune solution de nano3 à 0,5mol/l avec 500ml dune sol…
The solution used in too large a quantity is the \( CaCO_3 \) solution (or "solution de \( CaCO_3 \)").
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practice 2 select whether each statement reflects an increase, decrease…
To solve this, we analyze each statement using periodic table trends: ### 1. Atomic number (left→right, same period) - **Explanation**: In a period, each element has one more prot…
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through which element would someone most likely receive a shock? ○ iodi…
D. chromium (Cr)
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module 2 9 what do all isotopes of an element have in common? what diff…
Common: Same number of protons (atomic number). Differs: Number of neutrons (atomic mass). ### Question 10
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a student is given a metal sphere about the size of a softball and aske…
Lead
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consider the two resonance forms of an enolate, and the curved arrow no…
9:1
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the piece of wood in the figure has a mass of 96.4 grams. determine its…
0.584
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question 10 in ionic bonding, electrons are transferred from one atom t…
transferred (the option with the text "transferred") ### Question 11 (Atomic Mass Calculation)
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chemical bonding and atomic structure across 2 atomic number of 1 with …
Hydrogen
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what describes a compound? a a mixture of elements. b a single type of …
D. A substance made up of two or more elements chemically bonded together.
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an atom is the smallest unit of an element that maintains its propertie…
atom
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/6 4. parmi les propriétés laquelle, permet lusage des matériaux ou des…
8. Solubilité ### b)
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question 6 what is the atomic number of an element? a the total mass of…
C. The number of protons in the nucleus of an atom
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all atoms of a given element are identical. a true b false
B. False
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anions are positively charged ions. a true b false
B. False
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question 3 a molecule consists of two or more atoms with dropdown optio…
connected
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2 name and describe the three subatomic particles. for each particle, s…
- **Proton**: Located in the atomic nucleus, has a positive electric charge ($+1$). - **Neutron**: Located in the atomic nucleus, has no electric charge (neutral). - **Electron**:…
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question 3 a molecule consists of two or more atoms by covalent bonds.
bonded
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question 2 what is the overall charge of a cation? a neutral b negative…
D. Positive
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challenge problems taken ap chem 2022 free-response questions answer: 0…
\( 0.2722\ \text{g} \)
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(b) what number, in addition to the answer to part (a), is needed to de…
Avogadro's number (or \( 6.022 \times 10^{23} \) atoms/mol)
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pedro and denise were sharing a snack. pedro drank some hot tea while d…
The molecules in the ice water move slower than in the hot tea.
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3) fill-in-the-blanks: a)the electron arrangement in an atom is also ca…
electron configuration ### Part (b)
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for parts of the free response question that require calculations, clea…
The setup for the number of moles of \(CaBr_2\) is \(\frac{10.0\space g}{199.88\space g/mol}\)
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which statement is not a key point of the kinetic molecular theory (par…
A. Particles naturally repel one another.
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why would a pill dissolve so much faster in hot water than it does in c…
C. The hot water is made out of particles that are moving faster and are farther apart
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5)write the full electronic configuration of the element with atomic nu…
\(1s^2 2s^2 2p^6 3s^2 3p^2\)
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5. michael wanted to see what kitchen cleaner worked best for cleaning …
Type of kitchen cleaner (Lysol, Clorox, Pine - Sol, water) ### Part b: Dependent Variable (DV)
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how many co₂ molecules are there in 2.45 ml co₂? (hint 1000 ml = 1 l an…
Approximately \( 6.59 \times 10^{19} \) \( \text{CO}_2 \) molecules (or \( 6.586 \times 10^{19} \) for more precision).
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4.state true or false: a) the electron configuration, for degenerate or…
False ### Part (b)
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multiple choice 1 point bromine has two naturally - occurring isotopes.…
# Explanation: ## Step1: Recall the formula for atomic mass The atomic mass ($A$) of an element with isotopes is the weighted average of the masses of its isotopes. The formula is…
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the drawing below shows 3 sealed containers labeled x, y, and z. each c…
The correct option is the one where X contains a liquid, Y contains a gas, and Z contains a solid (the fourth option in the list, as per the original choices: "X contains a liquid…
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4. a student has a 1 g sample of each of the following compounds: licl,…
\( \text{NaCl} < \text{KF} < \text{LiCl} < \text{LiF} \)
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which household activity is a significant source of volatile organic co…
using chemical - based cleaning products
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question 1 (multiple choice worth 4 points) (01.06r mc) which of the fo…
A. Cream and milk, because of their difference in density
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3 would you expect an atom further down in a group to have a higher ele…
An atom further down in a group is expected to have a lower electron affinity than the atoms above it. This is because as we move down a group, the atomic radius increases (due to…
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dans le temps que vous avez été à miles mac maintenant, est-ce quil y a…
Oui, mon professeur de français m'a montré de la bonté en me donnant des explications supplémentaires sur les devoirs et en m'invitant à participer à des activités de groupe pour …
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a sample of a pure element is analyzed using a mass spectrometer to pro…
Average relative atomic mass: \( \boldsymbol{108 \, u} \) (or ~107.9 u with better estimation). Element: \( \boldsymbol{\text{Silver (Ag)}} \)
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a sample of a pure element is analyzed using a mass spectrometer to pro…
Average relative atomic mass: \( \boldsymbol{69.8} \) u (or ~70 u). Element: Gallium (Ga).
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estimate the atomic masses and relative abundances of the isotopes show…
The average relative atomic mass is \( 10.8 \, u \), and the element (with natural abundance) is likely Boron (average atomic mass ~10.81 u).
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a sample of magnesium contains the following relative abundances of its…
\(24.32\) (rounded to two decimal places, or as per significant figures requirements)
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a sample of rhenium contains the following relative abundances of its i…
\(186.25\) (or \(186.252\) depending on precision)
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a sample of bromine contains the following relative abundances of its i…
\(79.99\) (or \(79.9862\), rounded appropriately)
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a sample of chlorine contains the following relative abundances of its …
\(35.48\) (or \(35.4844\) depending on precision)
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5 numeric 1 point 0.000500 answer
0.000500 (or \(5.00\times10^{-4}\) if scientific notation is required)
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4. a condition in which blood is held back from an organ:______ select …
e. ischemia
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complete the table to determine the nuclear symbols for neutral atoms a…
- Atom A belongs to Antimony (Sb). - Atom B belongs to Antimony (Sb). - Atoms A and B are isotopes (Yes, same protons).
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15. condition of blood in the urine:______ select one: a. uremia b. isc…
d. hematuria
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practice it! all of the following are correct, except: food in a microw…
The incorrect statement is: Like conduction and convection, radiation can not occur in an empty space.
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complete the table to determine the nuclear symbols for neutral atoms a…
- Atom A belongs to: Zirconium (Zr) - Atom B belongs to: Zirconium (Zr) - Are they isotopes: Yes (because same number of protons)
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lors dun laboratoire vous faites réagir 2 g de c₂₅h₅₂ (s) avec 3 000 ml…
A. 0,0048 mol
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which of the following is the best, most comprehensive definition of po…
Asymmetrical charge distribution across a molecule (e.g. a dipole moment, such as that found in water).
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atom a nuclear symbol\tsubatomic particles \t\tprotons: 18 \t\tneutrons…
Argon (Ar) ### For Atom B:
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summarize it! drag and drop the words or phrases to accurately complete…
- "Methods of transfer of": thermal energy - Top empty box: convection - Right empty box: conduction - Left empty box: radiation