Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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question 1 1 pts how many moles of methane occupy a volume of 2.25 l at…
0.100 mol
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molar volume at stp is 1 mol/l standard temperature is 20 °c. molar vol…
- Molar Volume @ STP is \( 22.4 \, \text{L/mol} \) - Standard pressure is \( 760 \, \text{mmHg} \) - Standard pressure is \( 1 \, \text{atm} \) - Standard Temperature is \( 0^\cir…
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how many moles of methane occupy a volume of 2.00 l at 50.0 °c and 0.50…
0.0377 mol
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how many moles of gas were added to a balloon that started with 2.3 mol…
9.5 mol
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contains (no atoms, one atom) of that element. 7. the total number of a…
five ### Question 8:
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analysis questions: 1. does f⁻ have a larger or smaller radius than al³…
$F^-$ has a larger radius than $Al^{3+}$
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analysis questions: 1. does f⁻ have a larger or smaller radius than al³…
$F^-$ has a larger radius than $Al^{3+}$.
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question 10 of 29 determine the chemical symbols for the neutral elemen…
First: Kr Second: N Third: Ar Fourth: P
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shel silverstein wrote the poem \sarah cynthia sylvia stout.\ it is abo…
D. break down
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shel silverstein wrote the poem \sarah cynthia sylvia stout.\ it is abo…
C. grow food by natural means.
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question 10 of 29 group the following electronic configurations of neut…
Set A: \(1s^2 2s^2 2p^3\), \(1s^2 2s^2 2p^6 3s^2 3p^3\) Set B: \(1s^2 2s^2 2p^6 3s^2 3p^6\), \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6\)
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select the formula of a particle that can exist as a gas. □ nacl □ xe □…
B. Xe, C. H₂, D. H₂O
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select the correct answer. what is the greatest difference between ben …
B. tone
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consider the following liquids with similar molar masses and at the sam…
ethyl ether (surface tension = 17 dynes/cm)
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consider the data for the following liquids with similar molar masses a…
butyl alcohol (viscosity = 2.95 centipoise)
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consider the data for the following liquids with similar molar masses a…
propionic acid (Bp = 141 °C)
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question 1 what happens to the vapor pressure as the temperature of the…
The vapor pressure of the liquid increases.
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ap® chemistry: pes analyzing data from pes 1. which of the following el…
C. Ne ### Question 2
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read metric measurements volume (graduated cylinder) - read the volume …
First graduated cylinder: $\boldsymbol{2.5}$ mL; Second graduated cylinder: $\boldsymbol{35}$ mL; First thermometer: $\boldsymbol{-2}$ $^\circ$C; Second thermometer: $\boldsymbol{…
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question 1 1 pts when the rate of vaporization and the rate of condensa…
C. the vapor pressure will be stable.
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question 1 when the rate of vaporization and the rate of condensation a…
the vapor pressure will be stable.
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jane watches her dad spread salt on their driveway. he explains that sa…
Does dissolving salt in tap water reduce the water's freezing point? Does dissolving salt in tap water change the water's boiling point when heated on a hot plate?
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fill in the blanks. (19) __________________________ and _______________…
(19) Ralph Waldo Emerson; Henry David Thoreau (or other transcendentalists like Margaret Fuller) (20) doctrine; good; conscience; each person; law (21) Rhythm: Iambic (approximate…
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which formula is correct for **chromium(iii) oxide**? options: cro₂, cr…
\(Cr_2O_3\) (the option with \(Cr_2O_3\)) ### Second Sub - Question (Name of \(MnSO_4\))
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question 1 a system is in dynamic equilibrium... when the rate of the f…
A. when the rate of the forward process is equal to the rate of the reverse process.
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directions: using the lesson notes for the topics below, fill in the st…
- Matter: Anything with mass and volume. - Mass: Amount of matter in an object. - Volume: Space occupied by a substance. - Density: \( ho=\frac{m}{V} \) (mass per unit volume). - …
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question 2 which liquid had the weakest intermolecular attractive force…
A. acetone (\(\ce{CH3COCH3}\))
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semester 1 final exam study guide chemistry directions using the lesson…
- Convert 2.5 km to m: \(\boldsymbol{2500\space m}\) - Convert 3.6 hL to cL: \(\boldsymbol{36000\space cL}\) - Convert 250 mm to m: \(\boldsymbol{0.25\space m}\) - Convert \(25^\c…
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in order for a particle in a liquid to turn into a gas at temperature b…
- have sufficient energy to overcome the intermolecular attractive forces - be on the surface of the liquid
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identify each substance as either an element, a compound, a homogeneous…
- Carbon dioxide: Compound - Gold: Element - Pizza: Heterogeneous Mixture - Distilled water: Compound - Stainless steel: Homogeneous Mixture
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what is the charge of the nickel ion in the compound nis? options: +3, …
+2 (corresponding to the option with +2) ### Second Question (Name of \(PbCl_4\))
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question 17 7 pts below is a paragraph that tells a story of two people…
1. fireworks: Chemical Change 2. cut into smaller pieces: Physical Change 3. lit a match: Chemical Change 4. cooked until they were dark brown: Chemical Change 5. rusted: Chemical…
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the ability of a substance to be manipulated and pulled out or drawn in…
A. ductility ### Question 16 (A substance that consists...):
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in the compound crp, the charge of the chromium ion is +2. false true t…
False ### Second Question (The correct chemical formula for Iron(III) chloride is \( FeCl_2 \).)
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question 13 dropdown with solid selected is a state of matter where the…
A. trail mix
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Question was provided via image upload.
Transition metals ### Second Question (Calcium as transition metal)
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in order for a substance in the condensed state (solid and liquid) to t…
True
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the correct chemical formula for potassium iodide is: * options: ki₃, k…
B. KI (assuming the options are labeled with B as KI, if the original options had KI as one of them with label B) ### Second Sub - Question (Total atoms in magnesium phosphide's s…
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when there is all of same kind of substance (i.e. same characteristic p…
D. pure substance ### Question 9 (State of Matter)
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this type of substance can be either homogeneous or heterogeneous. mixt…
mixture ### Question 7 (Type of Change)
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this type of substance can be either homogeneous or heterogeneous. mixt…
physical (assuming the dropdown option is "physical"; if the original problem's dropdown has "physical" as the correct choice for the change type when appearance changes but ident…
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which of the following would be an example of a homogeneous mixture? ○ …
A. Kool - Aid ### Second Question (Substance with Two or More Elements Chemically Combined)
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in the chemical formula mgbr₂, what is the name of the anion component?…
bromide ### Second Question:
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a binary ionic compound is chemically formed by the electrostatic attra…
nonmetal ### Second Question (Multiple - choice)
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according to the law of conservation of matter, we know that the total …
2 (Assuming the second option with two medium orange circles is the correct representation, but based on atom balance, 2 water molecules are needed.)
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which two elements only need two valence electrons to be happy? 15/15 l…
Hydrogen and Helium
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if oxygen has 6 valence electrons and is in group 16 while chlorine has…
C. Subtract 10. (Assuming the third option is labeled C, with text "Subtract 10.")
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how do ionic bonds form? atoms donate electrons to a \sea\ of electrons…
The third option: Atoms gain or lose electrons to fill their valence shell.
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which of the following situations results from the transfer of an elect…
The electron loses potential energy.
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which part of the atom is responsible for chemical bonding? inner/core …
D. Outer/Valence Electrons
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how many valence electrons do elements in group 2, the alkaline earth m…
A. 2
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if an element gives away an electron, will it form a positive ion or a …
B. Positive.
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how many valence electrons do elements in group 1, the alkali metals, h…
The option with "1" (the third option among the four, showing the number 1).
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consider the phase diagram of an unknown substance. segment ab indicate…
For Segment AB: gas and liquid (first box: gas, second box: liquid) For Segment BC: solid and liquid (first box: solid, second box: liquid) For Segment BE: liquid and gas (first b…
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determine the molar enthalpy of combustion using the following calorime…
Approximately \(-1410\ kJ/mol\) (or more precise \(-1407\ kJ/mol\))
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determine the molar enthalpy of combustion using the following calorime…
The molar enthalpy of combustion of butane is approximately \(\boldsymbol{-2860\ kJ/mol}\) (or more precisely around \(-2860\ kJ/mol\) depending on calculation precision).
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determine the molar enthalpy of combustion using the following calorime…
Approximately \(-1400\ \text{kJ/mol}\) (or more precisely \(-1404\ \text{kJ/mol}\))
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determine the molar enthalpy of combustion using the following calorime…
Approximately \(-1370\ kJ/mol\) (or more accurately \(-1.37\times10^3\ kJ/mol\) after precise calculation)
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determine the molar enthalpy of combustion using the following calorime…
The molar enthalpy of combustion of cyclohexane is approximately \(\boxed{-3910\ kJ/mol}\) (or more accurately, around -3920 kJ/mol depending on precise calculations, close to the…
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determine the molar enthalpy of combustion using the following calorime…
Approximately \(-2440\space kJ/mol\) (or more precise \(-2444\space kJ/mol\))
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report your answers to the nearest thousandth digit, in mj / mol (these…
\boxed{-3.418}
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must do .. ionic compounds with polyatomic ions identify the polyatomic…
# Explanation: ## Step 1: Completar la tabla de iones poliatómicos - **Acetato**: Fórmula $\ce{C2H3O2^-}$, carga $-1$ (ya completado). - **Hidróxido**: Fórmula $\ce{OH^-}$, carga …
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single replacement practice (predict + balance) 1. ___ nacl(aq) + ___ m…
s (Balanced Reactions): 1. \( \boldsymbol{2\text{NaI(aq)}+\text{Mg(s)} ightarrow \text{MgI}_2\text{(aq)}+2\text{Na(s)}} \) 2. \( \boldsymbol{2\text{NH}_4\text{Br(aq)}+\text{Cl}_2\…
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directions: for the following questions, choose the best answer or resp…
B. Love can be painful or hard to accept; sometimes it even arouses hate.
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in two or more words, briefly explain how you can use coulombs law to d…
Para determinar la fuerza de enlace iónico dentro de una molécula usando la ley de Coulomb, se sigue este proceso: 1. **Recuerda la ley de Coulomb**: La fórmula es $F = k \frac{|q…
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cognitive-behavioral therapy (cbt): a. is used along with medication. b…
D. is a combination of cognitive and behavioral therapies.
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an element is determined by the number of _______ in its nucleus (also …
C. protons (assuming the options are labeled as A. neutrons, B. electrons, C. protons; if labels are different, adjust to the correct identifier with "protons")
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chemist use letters of the alphabet as _______ for the elements. colors…
B. symbols (assuming the middle option is labeled B, with text "symbols")
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multiple choice question oxygen is a compound with ____ covalent bond. …
D. electronegative
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when riding a roller coaster, you go up and down many hills. as you get…
D. Kinetic energy is changed into potential energy.
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be 4 beryllium 9.012 how many protons does this atom have? 5 4 9.012 be
B. 4 (assuming the option with "4" is the correct one; from the options, the second option with "4" is correct)
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8/20 each element is made up of only one kind of molecule neutron atom …
C. atom (assuming the options are labeled A. molecule, B. neutron, C. atom, D. electron; if the third option is "atom" as per the visual, the correct choice is the third option la…
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6/20 which of the following are elements? pick 3 select all correct opt…
Hydrogen (H), Carbon (C), Oxygen (O)
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what is the primary goal of integrated pest management (ipm)? to comple…
C. to reduce pest damage to an acceptable level (assuming the options are labeled A, B, C, D with A being "to completely eradicate all pests", B being "to control pests with only …
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4/20 how many elements are there in the periodic table? 100 226 118 too…
C. 118
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when you compress a spring, you are storing __________ energy. chemical…
D. elastic (assuming the options are labeled A: chemical, B: light, C: sound, D: elastic; if no labels, the rightmost option with "elastic")
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a baseball held by a pitcher has ____________ energy. kinetic chemical …
Potential (the option labeled "Potential")
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which were popular chemical compounds that were found to be effective i…
C. pyrethrum and rotenone
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what type of energy is in this picture? sound kinetic potential chemical
C. Potential (assuming the third option is labeled as such; if the options are as given with "Potential" as the third choice, the answer is the option with "Potential")
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what does organic agriculture avoid using? natural fertilizers traditio…
C. synthetic pesticides and fertilizers
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in this chemical formula for caffeine, how many carbon atoms are there?…
8
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question 4 (1 point) listen ph5. select all the correct statement(s) ab…
The correct statements are: - \(\boldsymbol{[OH^-] < 1.0\times10^{-7}\ M}\) - \(\boldsymbol{[H_3O^+] > [OH^-]}\) - \(\boldsymbol{\text{It is acidic}}\)
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multiple choice question how many valence electrons does neon have? ¿cu…
C. 8
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multiple choice question lewis dot diagram for cesium, what does the do…
A. It represents one valence electron./Representa un electrón de valencia.
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write the electron configuration of aluminum (al)? ¿escribir la configu…
La configuración electrónica del aluminio (Al) es \(1s^2 2s^2 2p^6 3s^2 3p^1\) (o en forma abreviada \([Ne] 3s^2 3p^1\)).
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using the solubility rules given, predict if the ionic compound nico₃ i…
Insoluble
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define the term \chemical change.\ select one: occurs when a substance …
The option (third from the left, labeled "Occurs when a substance is converted into a different substance")
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question 5 of 10 which of the following is an example of groupthink? a.…
D. If everyone in a company wants a new chemical plant to begin operation as soon as possible, so they sign off on the safety plan.
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define the term \chemical property.\ select one: occurs when a substanc…
The option with text "Characteristic a substance shows as it changes into or interacts with another substance or substances"
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1.547 grams of hydrated mgso₄ is heated in a crucible. after heating, 0…
7
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how many decimal places would a measurement using a 10ml graduated cyli…
1
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which of these are signs that a chemical reaction has taken place? sele…
All of the above
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which of the following statements is not true regarding non - bonding e…
The option "They take up less space than bonding domains and result in larger than expected bond angles." (the fourth option in the list)
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a chemical species that is present but does not directly participate in…
Spectator (the option labeled "Spectator")
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using the solubility rules given, predict if the ionic compound agcl is…
Insoluble (the option labeled "Insoluble")
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77. which set of descriptions is correct 1 point (images of energy grap…
The option "photosynthesis, endothermic and has the following graph" (the bottom - right option) is correct.
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define the term \physical property.\ select one: occurs when a substanc…
The option with "Characteristic that matter shows by itself, without changing into or interacting with another substance" (the third option in the list of radio buttons, i.e., the…
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2. what is the definition of a hydrophobic substance and give an exampl…
2. A hydrophobic substance is a substance that repels or is insoluble in water (it is non - polar and does not form favorable interactions with water molecules). An example of a h…
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define the term \molar mass.\ select one: the reactant in the least amo…
the mass in grams of one mole of atoms or molecules of that compound
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what is the percent abundance (in units of percent) of zinc in a sample…
\( 61.0 \)