Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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consider the four models of the carbon (c), oxygen (o), nitrogen (n), a…
Nitrogen - 3 unpaired electrons Oxygen - 2 unpaired electrons Hydrogen - 1 unpaired electron Carbon - 2 unpaired electrons
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groundwater aquifers are only renewable if ____________(complete this s…
Question 8: we use the water in them at a rate slower than they are able to replenish. Question 9: True
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consider the four models of the carbon (c), oxygen (o), nitrogen (n), a…
Oxygen: 2 unpaired electrons Hydrogen: 1 unpaired electron Carbon: 2 unpaired electrons
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the diagram below represents a molecule made of five atoms connected by…
Arrow 2
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a quick side note: representations like the one above are called “model…
C. $H^{+}$
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determine the name of each compound. use r cuo: cu₂o: crs: cr₂s₃: febr₂…
CuO: Copper(II) oxide Cu₂O: Copper(I) oxide CrS: Chromium(II) sulfide Cr₂S₃: Chromium(III) sulfide FeBr₂: Iron(II) bromide FeBr₃: Iron(III) bromide
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8 fill in the blank 1 point consider the elements listed below: iodine …
Fluorine
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the atoms that make up different elements share other key characteristi…
- Carbon's outer electron shell contains four electrons. - The carbon nucleus contains 6 protons and 6 neutrons.
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which statements accurately describe the model of the carbon atom above…
- Carbon's outer electron shell contains four electrons. - True - If this model showed a nucleus with seven protons, it would still represent carbon. - False - Carbon's electrons …
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7 fill in the blank 1 point elements in the same choose your answer... …
1. period 2. protons 3. greatest
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chemistry: fundamentals and davidson give the systematic name of each c…
\(P_2S_5\): diphosphorus pentasulfide \(CO\): carbon monoxide \(P_3N_5\): triphosphorus pentanitride
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6 fill in the blank 1 point as the number of energy levels increases, t…
First blank: more Second blank: less
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5 fill in the blank 1 point as the distance between a proton and valenc…
increases
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4 fill in the blank 1 point selenium (se) has type your answer... energ…
4 6
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5. a. provide one example of an endothermic or exothermic reaction (dif…
a. An example of an exothermic reaction is the combustion of methane. The chemical equation for the combustion of methane ($CH_4$) in the presence of oxygen ($O_2$) is $CH_4 + 2O_…
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3 fill in the blank 1 point silicon (si) has type your answer... energy…
First blank: 3 Second blank: 4
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2 fill in the blank 1 point barium (ba) has type your answer... energy …
6; 2
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exit ticket: coulombic attractions 1 fill in the blank 1 point an elect…
An electron is attracted to the protons in the nucleus. An electron is repelled by the other electrons in the atom.
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which of the following are the types of scientific models? select all t…
A. conceptual, C. physical, D. mathematical
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43 complete subjects and predicates the complete subject of a sentence …
**Practice A - Identifying Simple and Complete Subjects**: 1. Complete subject: My dad's carpentry job; Simple subject: job 2. Complete subject: The school cafeteria; Simple subje…
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question 14 of 22 general chemistry 4th edition mcquarrie • rock • gall…
sodium sulfite: $Na_2SO_3$ potassium phosphate: $K_3PO_4$ silver sulfate: $Ag_2SO_4$ ammonium nitrate: $NH_4NO_3$
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the following picture would be best described as
A. a liquid mixture
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which of the following is an extensive property of the element carbon? …
D. The mass of a carbon sample
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which of the following is an example of an intensive property of a bar …
A. The bar has a density of 19.2 g/mL.
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multiple - choice question what is elastic potential energy? energy sto…
Energy stored in objects that are stretched or compressed
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answer: a a liquid compound b a gaseous mixture c a gaseous compound d …
C. a gaseous compound
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variables hw check a class investigates how temperature affects the rat…
Amount of sugar - Constant Room temperature group - Control group Temperature of water - Independent variable Time for sugar to dissolve - Dependent variable
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multiple - choice question nuclear potential energy is similar to what …
C. Chemical Potential Energy
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at the temperatures specified, identify the following substances as a s…
1. Solid 2. Plasma 3. Liquid 4. Gas 5. Solid 6. Liquid 7. Gas 8. Liquid 9. Compound 10. Homogenous mixture 11. Homogenous mixture 12. Element 13. Heterogeneous mixture 14. Compoun…
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multiple - choice question what kind of energy does firewood, batteries…
Chemical Potential Energy
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identify the symbol for each element 1 oxygen o 2 hydrogen h 3 chlorine…
| Element | Symbol | Atomic Number | Period | Group | | ---- | ---- | ---- | ---- | ---- | | Sodium | Na | 11 | 3 | 1 | | Oxygen | O | 8 | 2 | 16 | | Krypton | Kr | 36 | 4 | 18 | …
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1. what effects did the heating or freezing time have on the outcomes o…
Heating or freezing time can impact texture, flavor, and physical - chemical properties of food in cooking experiments.
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which would show an example of how physical changes are reversible? cut…
melting tin and then cooling it into a mold
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a graduated cylinder is filled with 100.0 ml of water. the cylinder is …
Sample A > Sample B > Sample C
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which is a characteristic of atoms? they come in ten major types. they …
They are the smallest units of matter.
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3. describe what happens to the particles in a berry sauce mixture as i…
The particles gain kinetic energy and move more rapidly, some may change to the gas phase through evaporation.
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4. what are the characteristics of an extensive property of matter? 5. …
4. Depends on amount of matter. 5. Cement, pea soup, apple sauce. 6. Does not depend on amount of matter. 7. Salt water, air, stainless steel. 8. Mass, volume. 9. Homogeneous. 10.…
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6al₂(so₄)₃ al= s= o=
$Al = 12$, $S = 18$, $O = 72$
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2. describe what happens to the particles in an ice cream mixture as it…
As the ice - cream mixture freezes, the water molecules slow down and arrange into a crystalline structure, and the movement of all particles decreases due to loss of kinetic ener…
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why is matter so diverse in its properties and characteristics? differe…
Different combinations of various atoms result in a wide range of matter.
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what happens to the total mass of a substance undergoing a physical cha…
It stays the same.
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which property of physical changes explains why matter is conserved in …
The bonds between atoms do not break; it is only the arrangement that changes.
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9. 3pb₃(po₄)₄ pb= p= o=
$Pb = 9$, $P = 12$, $O = 48$
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uranium is a type of atom. in special circumstances that usually involv…
It must be a different kind of atom.
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7. 4al₂(so₄)₃ al= s= o=
Al = 8, S = 12, O = 48
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6. 2pb(no₃)₂ pb= n= o=
$Pb = 2$, $N = 4$, $O = 12$
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5. 4mg(oh)₂ mg= o= h=
Mg = 4, O = 8, H = 8
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4. 3cu(no)₂ cu= n= o=
$Cu = 3$, $N = 6$, $O = 6$
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3. 5c₃h₅(oh)₃ c= h= o=
$C = 15$, $H = 40$, $O = 15$
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genius tip! to remember chemical formulas of nitrites, nitrates, and am…
vowels
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10. what is the isotope notation for a nucleus with 1 proton and 2 neut…
$_{1}^{3}H$
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2. what is the isotope name for a nucleus with 10 protons and 27 nucleo…
2. neon - 27 3. $^{171}_{76}Os$
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challenge question a square of aluminum foil has a mass of 1.85 grams. …
$24.4\ m/s$ ### 4)
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simone created a chart to summarize the energy transformations that tak…
kinetic energy transformed to mechanical energy
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6. make a rule: if you knew the number of valence electrons in a nonmet…
6. The valence of a non - metal (excluding hydrogen) is either the number of valence electrons or 8 minus the number of valence electrons. 7. Hydrogen has 1 valence electron and t…
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when javier touches a hot mug of tea, energy is transferred from the su…
C. thermal
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when a spring is compressed, the energy changes from kinetic to potenti…
work
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which structure is a lipid?
F
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that the oil floated to the top of the container after it had sat untou…
Control group: Cups with no oil. Experimental groups: Cups with thin oil layer, Cups with thick oil layer. Independent variable: Thickness of oil layer. Dependent variable: Water …
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the passage below describes a process of scientific inquiry. select the…
He wondered, "Could a thick enough oil layer prevent the water from evaporating?"
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which two types of potential energies would be types of mechanical ener…
D. elastic and gravitational
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how do the atomic mass and atomic number compare for helium? helium doe…
The atomic mass is greater.
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what differs between a radioactive isotope and a stable isotope of the …
Radioactive isotopes last for less time.
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how are the number of protons represented in the periodic table? atomic…
B. atomic number
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a neutral atom possesses an atomic number of 13 and an atomic mass of 2…
A. outside the nucleus
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after walking by some rusted cars parked in the street, lena wondered w…
Lena determined that iron is highly susceptible to corrosion in saline conditions while aluminum is much more resistant.
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the isotope of an atom containing 40 protons and 51 neutrons suddenly h…
Zirconium-93
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after walking by some rusted cars parked in the street, lena wondered w…
Lena's experiment supports her conclusion that iron is highly susceptible to corrosion in saline conditions while aluminum is more resistant.
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while washing his hands at his aunts house, malik noticed that the soap…
Soap lathers less in hard water than in soft water.
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erica loves making lemonade with fresh - squeezed lemon juice and water…
Citric acid is more effective than sugar at preserving lemonade's color and freshness.
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read the paragraph. 1 alejandros guidance counselor is helping him plan…
sentence 4
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read the sentence. 1 alejandros guidance counselor is helping him plan …
sentence 3
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which statement best describes the rhyme scheme of \a thought on the in…
There is a series of consecutive rhyming couplets.
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12) use your knowledge of the kinetic molecular theory to explain the f…
(a) Molecules are closely packed with strong forces, vibrating around fixed positions. (b) Molecules can slide past one another due to weaker forces. (c) Water molecules lose kine…
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bellwork, day 3: eview of the atomic size trend\ directions: please ans…
1. New electron - shells are added as you go down a group, increasing the atomic size. 2. Increased nuclear charge pulls electrons closer across a period, decreasing atomic size. …
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which one is not a sign of chemical change gas release melting ice crea…
melting ice cream
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question 2 of 22 write a molecular formula for this molecule. molecular…
$C_{17}H_{14}O_{3}$
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and rattles at the windows in a vicious spate. theres a crashing of a s…
rhyme scheme
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in the chemical reaction shown below, what is the beginning mass of mer…
216 grams
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fill in the missing words sodium bicarbonate is one of the compounds us…
0.00387; 0.00387; 310.15; 0.104
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copper is made of atoms an atom is the smallest part of an element. ato…
a copper atom
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1. periods are ____________ on the periodic table. left to right diagon…
C. horizontal rows
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there are different types of atoms. everything is made up of the atoms …
Bromine atoms
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question 1 1 pts 1. which statement describes a major difference betwee…
B. A traditional poem may contain regular meter and rhyme scheme, but a free verse poem does not contain these elements.
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9. triglycerides which are... a. solid at room temperature are called \…
a. Fats b. Oils
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there are different types of atoms. everything is made up of the atoms …
Selenium atoms
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the volume of hydrogen gas is twice the volume of oxygen gas. what is t…
More information is required.
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silver is made of atoms. an atom is the smallest part of an element. at…
a silver atom
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which is a characteristic of colloids? are homogeneous mixtures have la…
are made up of at least two substances
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there are 118 different elements listed on the periodic table. what is …
an atom
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eli states that sodium phosphate is a mixture because it is composed of…
It is incorrect because sodium phosphate is a compound that has a single composition.
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which of the following atmospheric pollutants are likely to react with …
B. nitrogen oxide (NO), C. sulfur dioxide ($SO_2$)
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what is the correct classification of a mixture in which both a solid a…
a heterogeneous mixture and a suspension
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3) calculate the average atomic mass of lithium (li), which occurs ⁶li …
$6.927$ amu
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which material is the least likely to be recognized as a mixture by loo…
a homogeneous mixture
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maria examines a mixture that appears to be the same throughout. howeve…
The mixture is a colloid because two different substances can be seen in a small sample.
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3. when one substance changes identity, it exhibits a(n) ____________. …
chemical property
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if you were able to cut this bar of gold over and over until you have t…
an atom of gold
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a chemical reaction is the only way to separate a(n) element pure subst…
pure substance
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check all appropriate safety precautions for handling each of t hydroch…
Wear chemical resistant gloves.