Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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multiple choice question in nature, sodium atoms lose electrons; theref…
D. cations
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fill in the blank question unstable and highly reactive chemical partic…
free radicals
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multiple choice question when a sodium atom loses an electron, it becom…
B. ion
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fill in the blank question a compound that dissociates in water, produc…
electrolyte
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multiple choice question which term refers to a negatively charged ion?…
A. Anion
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fill in the blank question high - energy radiation that can cause damag…
ionizing
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multiple choice question what does the breakdown of unstable atomic iso…
C. Ionizing radiation
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35 multiple choice 2 points in an area away from forests and cities, ge…
35. A. carbon dioxide 36. A. GIS
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what type of ion has lost an electron and, consequently, has a net posi…
C. Cation
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29 multiple choice 2 points the purpose of the kyoto protocol is to pre…
29. C. reduce greenhouse gas emissions 30. B. aquifers
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deuterium and tritium are isotopes of hydrogen. what is different about…
They have different numbers of neutrons.
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multiple choice question what is an ion? an atom with an unstable nucle…
An atom that has gained or lost electrons
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multiple choice question if an atom has 2 electrons in its innermost sh…
A. 3
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19 multiple choice 2 points oil and natural gas result from the burning…
19. the decay of tiny marine organisms that accumulated on the ocean floor millions of years ago. 20. industrial purposes.
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multiple choice question which term refers to the positively charged pa…
Proton
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multiple choice question unstable isotopes are called _______. ions rad…
B. radioisotopes
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11 multiple choice 2 points land where it is possible to grow crops is …
11. C. agricultural land 12. A. seeds are planted among the roots of the previous crop
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fill in the blank question atoms of the same element that differ only i…
isotopes
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multiple choice question if an atom has 2 protons and 2 neutrons, its a…
C. 4 amu
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fill in the blank question the electrons found in the outermost shell o…
Valence
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multiple choice question where is a neutron located? o surrounding the …
In the nucleus of an atom
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multiple choice question which term defines the simplest form of matter…
A. Element
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multiple choice question which subatomic particle does not contribute s…
B. Electron
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which of the following is an element? o protons o carbon dioxide o hydr…
Hydrogen
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1) a 110 ml solution of 0.340 m hcl(aq) is mixed with a solution of 330…
$0.0869\ mol$ ### 2.
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homework set #10 please print and show all work and answers on a separa…
1. De Broglie's hypothesis links electron's wave - like nature to quantized orbits and energies in hydrogen atom. 2. s - spherical, p - dumb - bell; $n$ for energy/size, $l$ for s…
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demonstrating understanding of the lab procedure the calorimeter is mad…
better insulators
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demonstrating understanding of the lab procedure. a coffee cup calorime…
the coffee cups could melt
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which fat is most likely a solid at room temperature? one that is satur…
one that is saturated
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in an oil spill, why does the oil not mix with the seawater? lipids are…
Lipids are hydrophobic.
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which fat has only single bonds between the carbon atoms in the fatty a…
saturated
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the combustion of magnesium creates so much energy so quickly that it i…
What is the enthalpy of the combustion of magnesium?
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for each food listed below, choose whether it has all single carbon - t…
Peanut butter: At least one double carbon - to - carbon bond Sunflower oil: At least one double carbon - to - carbon bond Cheddar cheese: All single carbon - to - carbon bonds
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pq - 30. a molecular compound is found to consist of 30.4% nitrogen and…
B. $92\ g\cdot mol^{-1}$
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physical vs. chemical change quick check which of the following happens…
Atoms of one or more substances rearrange into a new substance.
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what happens when you fry an egg? a) proteins from the yolk are transfe…
c) Denatured proteins form new interactions
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xenon tetrafluoride gas is placed in a 3 liter container at 80°c. the p…
0.0121 mol
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what is the volume of the container needed to store 0.8 moles of argon …
6.19 liters
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14. the molecule that has a molecular shape of trigonal pyramidal is _ …
PH₃; the central atom has a lone pair
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13. in the compound ch₃oh the shape around the c atom is ⅰ and the shap…
tetrahedral, bent
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13. in the compound ch3oh the shape around the c atom is _i_ and the sh…
tetrahedral, bent
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12. when its electron dot diagram is drawn, which molecule below appear…
BH₃
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use the following information to answer the next question boiling point…
London Dispersion, fewer
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9. a student described a structural diagram of a molecule as follows. 1…
The diagram where the central atom has 4 single bonds to outer atoms (the second diagram from the top in the provided image)
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8. the electron dot diagram for a molecule of nitrogen, n₂(g) would con…
A triple bond because each nitrogen has 3 bonding electrons to share.
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13. to be eluctant\ (line 7) is to be determined foolhardy unwilling ca…
13. C. unwilling 14. C. personification
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13. to be eluctant\ (line 7) is to be determined foolhardy unwilling ca…
13. C. unwilling 14. C. personification
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19. complete the following how many valence electrons does bromine have…
7151
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11. peoples trust in scientific accomplishment is best demonstrated by …
11. "Darkness has come / but technology will triumph" (lines 42 - 43) 12. optimism
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use the following information to answer the next question. a list of mo…
3124
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use the following information to answer the next question. statements a…
1247
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11. peoples trust in scientific accomplishment is best demonstrated by …
11. "Darkness has come / but technology will triumph" (lines 42 - 43) 12. courage
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20. fill in the blanks with the corresponding numbers, for a nitrogen a…
7313
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19. complete the following how many valence electrons does bromine have…
7251
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use the following information to answer the next question. a list of mo…
3124
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20. fill in the blanks with the corresponding numbers, for a nitrogen a…
7313
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use the following information to answer the next question the following…
1236
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use the following information to answer the next question. the followin…
1236
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14. the molecule that has a molecular shape of trigonal pyramidal is _ …
$PH_3$, the central atom has a lone pair
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13. in the compound ch3oh the shape around the c atom is _i_ and the sh…
tetrahedral, bent
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question 6 1.75 pts co2 is ____. a base molecule an acidic molecule lip…
an acidic molecule
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21. complete the following table (9 marks) when you write and draw out …
| Compound | Lewis Dot Diagram | Structural Diagram | VSEPR (shape) name | | ---- | ---- | ---- | ---- | | $SBr_2$ | Sulfur with 2 bonding pairs to bromines and 2 lone pairs | Ben…
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2. which of the following molecules would have the most polar bond? br …
H-O
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1. which type of intermolecular force is present between any molecules?…
London - dispersion force
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cuando el metano se quema, se combina con oxígeno para formar dióxido d…
D. Cuando se consume una unidad de metano, se produce una unidad de dióxido de carbono
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30. what is the energy conversion that happens in this process in a coa…
chemical to thermal
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27. what is the energy conversion that happens in a ceiling fan? 1 poin…
27. electrical to mechanical 28. chemical to mechanical
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25. the sun is powered by ___ energy (fusion reactions). 1 point mechan…
radiant
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17. electricity is ____ travelling through wires. protons neutrons elec…
17. C. electrons 18. D. nuclear
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16. atoms vibrating in place is ___ energy. 1 point mechanical radiant …
thermal
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nom de lélément :
Azote
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d. aluminium notation chimique : numéro atomique : nombre de masse : # …
Aluminium : Notation chimique : Al Numéro atomique : 13 Nombre de masse : 27 # de protons : 13 # d'électrons : 13 # de neutrons : 14 Magnésium : Notation chimique : Mg Numéro atom…
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exercices - le modèle de bohr - rutherford 1. dessinez le modèle de boh…
# Explications étape par étape: ## Étape 1: Trouver les informations pour le potassium - La notation chimique du potassium est K. - Son numéro atomique est 19. - Le nombre de mass…
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exercices sur latome 1. compléte le tableau ci - dessous : élément nota…
| Élément | Notation chimique | Numéro atomique | Nombre de masse | Nombre de protons | Nombre de neutrons | Nombre d'électrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- …
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true or false: functional groups are sets of atoms that are ionically b…
False
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6. which of the following is a key consideration when designing housing…
6. A. It should have proper ventilation 7. C. Housing for animals should provide a cozy environment with air - conditioning 8. D. Poultry houses should be located in residential a…
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6. which of the following is a key consideration when designing housing…
6. D. safety with air - conditioning equipment 7. B. Overcrowding can lead to a balanced diet 8. D. Poultry houses should be located in residential areas for easier market access …
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which product, according to fda labeling, is raw, unprocessed, contains…
A. fresh tomatoes
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question 14 electrically charged atoms or combinations of atoms are cal…
ions
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question 13 use the figure above to answer the following question(s). w…
acid rain ### Question 14
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question 9 river water held behind a dam is a form of ______. o kinetic…
C. potential energy
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question 8 use the figure above to answer the following question(s). st…
is roughly 10,000 times more acidic than normal rainwater
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question 4 when you burn a log in your fireplace, you are converting _.…
chemical energy to thermal (heat) energy
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question 3 ____ is defined as the number of protons plus the number of …
E. Mass number
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question 1 a(n) ____ is the smallest component of an element that still…
A. atom
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under certain conditions the rate of the reaction is zero - order in ni…
$2.98\ mol$
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question 43 endorphins are _________. radically different in function f…
pain - controlling chemicals
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optimization problems scenario a: fruit smoothie to make their deliciou…
The objective function is $C = 40x + 50y$ subject to the constraints $x\leq8$, $y\leq 10$, $y\geq2x$, $x\geq0$, $y\geq0$.
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optimization problems scenario 4: fruit smoothie to make their deliciou…
Objective function: $C = 40x + 40y$ Constraints: $x\leq8$, $y\leq10$, $y\geq2x$, $x\geq0,y\geq0$
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multiple - choice question cations have a _______________ radius than t…
smaller
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what is the label for the orbital shown here that indicates the type of…
$d_{xy}$
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use the ph chart to determine the possible contents of each test tube s…
Biuret solution.
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question 19 (1.5 points) saved when salt (nacl) dissolves in water, the…
C. electrostatic interaction; solution
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question 18 (1.5 points) saved two atoms each have the same number of n…
B. different elements entirely
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a student carefully pours water down a string from a cup on the counter…
A. adhesion and cohesion, D. capillary action
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which part of the glucose molecule below determines its biochemical beh…
A
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all of the following are characteristics of phosphate functional groups…
they are not good buffers because they are unable to accept or donate H+ ions in solution
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question 10 (1.5 points) saved an atoms reactivity with other atoms dep…
valence electrons
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in the water molecule (h2o) how many of its own electrons does the oxyg…
1
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question 8 (1.5 points) saved which of the following is correctly ranke…
B. lemon juice - blood - inside of small intestine