Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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3. state the property used to organize elements in the modern periodic …
a. Hg b. Period 6, Group 11 c. Approximately 55.85 d. 10 e. Copper
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15 il est important dutiliser adéquatement les lettres majuscules et mi…
CO : Représente le monoxyde de carbone, composé de carbone et d'oxygène. Co : Représente l'élément chimique cobalt.
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the energy used to move musical instruments is a. chemical b. electrica…
d. Mechanical
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b.f. skinner was what kind of scientist? behavioral pschologist dermato…
Behavioral Psychologist
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which type of chemistry (pure chemistry or applied chemistry) is done p…
Química pura
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select the text from the paragraph that best helps you understand that …
"After working as a field doctor during World War I and witnessing how many soldiers died needlessly from bacterial infections, Fleming recognized the exigency of finding a chemic…
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based on its location on the partial periodic table shown below, which …
D. B
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for each list, place elements in order of least to greatest atomic mass…
1) N, As, Bi 2) Ne, Ar, Rn 3) Ca, Fe, Pb
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atomic radius the atomic radius of elements increases moving ? each gro…
Down; Left
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classify the following as either pure chemistry or applied chemistry. t…
# Explicación breve: La química pura se centra en la comprensión básica de los conceptos y propiedades químicas, mientras que la química aplicada se ocupa de utilizar ese conocimi…
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multiple - choice question which atom is smaller? bromine (br) chlorine…
B. Chlorine (Cl)
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5) a flask that weighs 345.8 g is filled with 225 ml of carbon tetrachl…
$1.59$ g/mL ### 6)
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what happens to your drivers license if you refuse to take a chemical t…
A. YOUR DRIVER'S LICENSE WILL BE TAKEN AWAY
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which has the highest ionization energy? (hint: remember the octet rule…
Neon (Ne)
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which has the lowest ionization energy? (hint: remember that it has the…
Sodium (Na)
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read the descriptions of rhyme schemes below. free verse: poetry that d…
A. free verse
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multiple - choice question a monomer is a - ring of proteins building b…
B. building block
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7) ch₄ + o₃ → co₂ + h₄o atom reactants products c h o
| Atom | Reactants | Products | | ---- | ---- | ---- | | C | 1 | 1 | | H | 4 | 4 | | O | 3 | 3 |
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9) 2kclo₃ → 2kcl + 6o₂ atom reactants products k cl o
| Atom | Reactants | Products | | ---- | ---- | ---- | | K | 2 | 2 | | Cl | 2 | 2 | | O | 6 | 12 |
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atoms for each side of the equation. 11) k₃po₄ + 3hcl → 3kcl + h₃po₄ at…
| Atom | Reactants | Products | | ---- | ---- | ---- | | K | 3 | 3 | | P | 1 | 1 | | O | 4 | 4 | | H | 3 | 3 | | Cl | 3 | 3 |
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fitbq 2: the length of a period in the periodic table is determined by …
# Explicación: ## Paso 1: Recordar la relación entre periodos y electrones En la tabla periódica, el número de electrones que pueden ocupar los orbitales de un nivel energético de…
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which of the following is a nonmetal? a copper b carbon c calcium d ces…
# Breve explicación: Los metales son elementos que son buenos conductores de calor y electricidad, tienen lustre y son dúctiles y maleables. El carbono es un no - metal, mientras …
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what is the iupac name of the compound below? 2,6 - dihydroxytoluene 1 …
C. 2 - methyl - 1,3 - cyclohexanediol
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which compound can be oxidized to a carboxylic acid?
The compound with the structure having a primary - OH group (the fourth structure in the image)
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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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when olive oil and sodium hydroxide are mixed together, soap and glycer…
C. This is a chemical reaction because new substances (soap and glycerol) are made.
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question: 6 of 10 melting point: -7℃ boiling point: 79℃ nonmagnetic sol…
D. All four samples are from different substances.
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a student measures some physical properties of different substances. th…
B. G and I: boiling and melting point H and J: density
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students are asked to classify these substances based on their physical…
| Help | Not Help | |--|--| | Conductivity in water, Density, Solubility | Color, Magnetism, Mass |
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8. how many electrons, protons, and neutrons are found in each of the f…
a) Electrons: 12, Protons: 12, Neutrons: 12 b) Electrons: 10, Protons: 11, Neutrons: 12 c) Electrons: 17, Protons: 17, Neutrons: 18 d) Electrons: 18, Protons: 17, Neutrons: 18 e) …
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1. estimate the mass of one ¹⁴c atom (in amu) as precisely as you can (…
14 amu
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what makes an atom? provide an answer in complete sentences that descri…
An atom is composed of a nucleus with protons and neutrons, and electrons that orbit the nucleus. The number of protons in the nucleus is the atomic number, which defines the elem…
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12. describe what the isotopes of an element have in common and how the…
Isotopes of an element have the same number of protons. They differ in the number of neutrons.
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17. even a slight change in ph can be harmful! how do buffers moderate …
Buffers contain a weak - acid/conjugate - base or weak - base/conjugate - acid pair. They react with added acids or bases to resist pH changes.
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12. describe what the isotopes of an element have in common and how the…
1. The mass of one $^{14}$C atom is approximately 14 amu because it has 2 more neutrons than $^{12}$C and the mass of a neutron is approximately 1 amu. 2. a) The mass of an electr…
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considering the role of enthalpy in choosing energy sources many fuels,…
The enthalpy of combustion is a large negative value. Burning hydrocarbons produces a lot of energy.
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chemactivity 1 what makes an atom? 11. complete the following table. is…
| Isotope | Atomic Number (Z) | Mass Number (A) | Number of Electrons | |---|---|---|---| | \(^{59}Co^{2+}\) | 27 | 59 | 25 | | \(^{14}N\) | 7 | 14 | 7 | | \(^{7}Li\) | 3 | 7 | 3 …
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the actual enthalpy of the magnesium flare reaction is -603 kj/mol. you…
The coffee cup calorimeter may have absorbed some heat. The thermometer did not measure the temperature of the solution properly. Reading the maximum temperature values from the t…
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2. interactions between spheres involve movement of energy and/or matte…
Possible spheres: biosphere, atmosphere, hydrosphere. Interactions: Chemicals from spraying moving from atmosphere to biosphere; water evaporation from hydrosphere to atmosphere a…
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13. consider coffee to which you have added sugar. which of these is th…
13. Solute: Sugar; Solvent: Coffee 14. It is a polar molecule, enabling interaction with ionic and polar covalent compounds. 15. Hydrophobic: Repel water, e.g., oil; Hydrophilic: …
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11. complete the following table. isotope atomic number z mass number a…
**: Isotopes of an element have the same number of protons (and thus the same atomic number), which gives them the same chemical properties. They differ in the number of neutrons,…
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determining and interpreting the enthalpy of the magnesium combustion r…
There seems to be an error in the provided answer - options as the calculated value is - 569 kJ/mol and it is not among the given options (-817, -654, -245). If we assume there is…
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analyzing the intermediate reactions if you reverse reaction 2 and comb…
H₂O, H₂
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directions: answer each question by circling the correct choice. after …
1. C. produces ($H^+$) ions in water 2. B. turns blue litmus paper red 3. C. bases 4. B. bases 5. C. acidic 6. A. acids 7. A. pH 3 8. A. acids 9. B. base 10. B. Red litmus paper s…
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reflecting on the laboratory experiment. to find the enthalpy of a reac…
First blank: mass Second blank: temperature
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reflecting on the laboratory experiment. a law allows you to find the n…
Hess
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reflecting on the laboratory experiment. what were the learning goals o…
1. to compute the enthalpy of a reaction that cannot be measured directly using a simple calorimeter 2. to compute a reaction's enthalpy directly using mass measurements and a cal…
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understanding concepts 1. what is \combustion\? 2. (a) when fossil fuel…
1. Combustion is a rapid oxidation process with heat and light production. 2. (a) Fossil - fuel and oxygen. (b) Carbon dioxide and water. (c) Due to impurities in fossil - fuels. …
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what is the purpose of safety data sheets? o to list information such a…
To list information such as precautions and possible hazards of a chemical
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read shakespeares \sonnet 100.\ where art thou, muse, that thou forgets…
C. cdcd
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how do you see the concept of hybridization being applied in real - wor…
Hybridization affects molecular shape, bond angles, reactivity. Examples: $CH_4$ with $sp^3$ hybridization (tetrahedral, affects substitution reactions); $C_2H_4$ with $sp^2$ hybr…
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3 which of the following is not a subatomic particle found in an atom? …
B. Nucleus
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2 all matter is made up of... a. cells b. atoms c. organelles d. mixtur…
B. Atoms
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2 all matter is made up of... a. cells b. atoms c. organelles d. mixtur…
B. Atoms
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3 which of the following is not a subatomic particle found in an atom? …
B. Nucleus
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phet exercises 16. the periodic table has a great deal of information a…
a) 17 b) 74 c) 17 d) 52 e) No
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which are classifications of fatty acids? o saturated and unsaturated o…
Saturated and unsaturated
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understanding concepts 1. what is \corrosion\? 2. how is an oxide forme…
1. Corrosion is the deterioration of metals due to environmental reactions, often oxidation. 2. An oxide is formed when a substance reacts with oxygen through an oxidation - reduc…
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12. play with the simulation to determine (make sure all boxes are clic…
12. a) Protons and neutrons b) Electrons 13. b) 17 c) 18 d) Number of protons e) Number of neutrons 14. Same atomic number, different mass numbers 15. Isotopes
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groups of atoms that are added to carbon backbones and that give organi…
functional
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part iii: isotopes 12. play with the simulation to determine (make sure…
Protons and neutrons ## Step2: Determine particles not affecting atom stability Electrons are in the electron - cloud outside the nucleus and do not directly affect nuclear stabil…
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the term that refers to the sum of all the chemical reactions in the bo…
Metabolism
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which of the following will, in general, increase the rate of a reactio…
Increasing concentration of reactants, Increasing temperature
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2. a fly spray accidentally sprayed onto open food on a preparation tab…
# Breve explicación: La pulverización accidental de un insecticida (un producto químico) sobre alimentos en una mesa de preparación es un ejemplo de contaminación química. Las otr…
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eral, a process that involves the formation or breakdown of molecules i…
reaction
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glucose is a ______ of starch. o polymer o monomer o functional group o…
B. monomer
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which of the following is a definition of energy? o the tendency of one…
The capacity to do work
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carboxyl and phosphate groups are examples of ________. free radicals o…
D. functional groups
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substances that are physically blended but not chemically bound are cal…
mixtures
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art-111-z191 2025fa - art appreciation / module 4 september 8 - 14 / ch…
False
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which of the following would give you the molarity of a solution? o mol…
Moles/liter
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to a certain point, increasing the concentration of reactants in a solu…
B. increase
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a proton (h⁺) donor, or a chemical that releases protons into solution,…
acid
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a chemical reaction is a process in which a covalent or ionic bond is b…
True
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in a solution, the solvent is ______ the solute. o more abundant than o…
more abundant than
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which is a hydrophobic substance? o fats o water
Fats
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a molecule may be composed of one element or more than one element. tru…
True
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hcl is a compound that releases hydrogen ions when put into water. ther…
acid
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an atom or molecule that has gained or lost electrons is called a(n)
ion
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in a solution, the more abundant substance that dissolves another subst…
A. Solvent
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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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hydrophobic means that a substance is insoluble in
water
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substances that are physically blended but not chemically bound are cal…
Mixtures
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atoms that make up molecules _______. o must be identical o may be iden…
B. may be identical or different
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what is an ion? o an atom that has gained or lost electrons o an atom w…
An atom that has gained or lost electrons
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isotopes differ from one another by containing different numbers of whi…
B. Neutrons
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which is an uncharged particle found in the nucleus of an atom? neutron…
Neutron
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multiple choice question which term defines the simplest form of matter…
Element
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c) ______________ is a mixture in which the composition is not uniform …
c) Heterogeneous mixture d) Homogeneous mixture
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a) element is a pure substance containing only one type of atoms. b) is…
a) An element b) A compound
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q2. fill in the blanks with suitable words. a) __________________ is a …
Element
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7. what does it mean to be a carbon sink?
A carbon sink is a natural or artificial reservoir that accumulates and stores some carbon - containing chemical compounds for an indefinite period. It removes carbon dioxide (CO₂…
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which of the following is an endothermic source of energy? ○ melting ic…
Melting ice cube
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18. what is a polymer? what is a monomer? 19. using figure 3.7a in your…
A polymer is a large molecule composed of repeating monomer subunits. A monomer is a small molecule that can join with other monomers to form a polymer. The reaction where monomer…
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21. let’s look at carbohydrates, which include sugars and starches. fir…
21. Monosaccharides 22. a. $\mathrm{C}_{6}\mathrm{H}_{12}\mathrm{O}_{6}+\mathrm{C}_{6}\mathrm{H}_{12}\mathrm{O}_{6} ightarrow\mathrm{C}_{12}\mathrm{H}_{22}\mathrm{O}_{11}+\mathrm{…
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how many moles of iron is needed if 4800 kj of energy is released from …
12.86 mole
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part 4: sedimentary rock practice. use the earth science reference tabl…
- The grain - size range of siltstone is 0.004 to 0.0625 cm. - Shale is made up of particles smaller than 0.004 cm. - Rock salt is composed of halite. - Limestone is composed of c…
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what is the grain size range of siltstone? what size particles make up …
1. The grain - size range of siltstone is 0.004 - 0.0625 mm. 2. Shale is made up of particles smaller than 0.004 mm. 3. Rock salt is composed of halite. 4. Limestone is composed o…
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6. what 3 molecules are in volcanic eruptions?
Water vapor (H₂O), carbon - dioxide (CO₂), sulfur - dioxide (SO₂) (common examples, there are other possible ones too)
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benzyl alcohol is a colorless liquid with a gentle, pleasant aroma. wha…
The first product formed when benzyl alcohol is oxidized is benzaldehyde.