Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which of the following is an example of an intermolecular force? pi bon…
B. dipole-dipole force
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vsepr predicts an sbf₅ molecule will be which of the following shapes? …
trigonal bipyramidal
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the bond angle in co₃²⁻ is expected to be approximately 90 degrees 109.…
120 degrees
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the bond angle in co₃²⁻ is expected to be approximately 90 degrees 109.…
120 degrees
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the molecules in the following set do not include which of the followin…
trigonal pyramidal
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the geometry of the icl₂⁻ molecule is best described as: bent tetrahedr…
linear
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question 11 (1 point) a molecule exhibits the trigonal bipyramidal shap…
Five
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which of the following molecules demonstrates a trigonal planar molecul…
A. BF₃
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the geometry of the brf₃ molecule is best described as: bent tetrahedra…
t-shaped
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which of the following molecular geometries exhibits the largest bond a…
linear
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which of the following is not a correct statement from the lewis theory…
B. Electrons are most stable when they are unpaired.
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which of the following is not a correct statement from the lewis theory…
B. Electrons are most stable when they are unpaired.
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question 3 (1 point) which of the following is an organic compound? a. …
D. \(CH_4\)
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which of the following has the greatest number of unshared electrons ar…
$\text{I}_3^-$
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question 1 (1 point) ms. hiba goes to the beach in the morning. she see…
B. water has a high specific heat capacity.
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resonance structures are needed to describe the bonding in which of the…
HNO₃
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resonance structures are needed to describe the bonding in which of the…
A. $\text{CO}_2$
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resonance structures are needed to describe the bonding in which of the…
HNO₃
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what does the law of conservation of matter state? matter cannot be cre…
A. Matter cannot be created or destroyed.
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which of the following has the greatest number of unshared electrons ar…
CIF₃ (Note: Assuming the option label is a typo for ClF₃, which is the correct formula with the most unshared electrons)
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which of the following compounds demonstrates an exception to the octet…
SF₆
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question 1 (1 point) the number of electron groups exists in the valenc…
3
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how do barrier devices differ from hormonal methods for contraception? …
D. Barrier devices block sperm from reaching an egg, while hormonal methods prevent ovulation.
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2c₆h₆(g) + 15o₂(g) → 12co₂(g) + 6h₂o(g) 2.00 mol c₆h₆ reacts with oxyge…
134.4
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2co(g) + o₂(g) → 2co₂(g) 9.0 l of o₂ react with excess co at stp. how m…
0.80
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n₂(g) + 3h₂(g) → 2nh₃(g) how many liters of nh₃ is produced from 82 l o…
55 (rounded to nearest whole number) or 54.7 (rounded to one decimal place)
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co(g) + 2h₂(g) → ch₃oh(g) how many moles of ch₃oh is produced from 26 l…
$\approx 1.16$ mol CH₃OH
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gas stoichiometry at stp caco₃(s) x07a cao(s) + co₂(g) 3.25 mol caco₃ d…
72.8
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mlr: batteries, starting & charging - batteries overview (mlr) check ba…
Hydrogen and oxygen.
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choose the correct answer. which term means \stopping bleeding\? hemogl…
C. hemostasis (assuming the options are labeled A: hemoglobin, B: thrombosis, C: hemostasis, D: ischemia; if the original labels differ, adjust the identifier but the term is hemo…
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soil classification is partially determined by the presence of organic …
a. a forest because it has more trees to provide plant litter c. a forest because it has more animals to mix the soil
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pre - lab questions: 1. what is the independent variable in this lab ac…
1. Type of metal used 2. The flame color | | Name of Compound | Chemical Formula | Observation(s) | | --- | --- | --- | --- | | A | Sodium Chloride Soln | NaCl | Orange Fire | | B…
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when biogeochemical cycles are impacted by humans, they tend to destabi…
positive feedback loop
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1. as you enter the room, you see a priest praying over hebtepe, and ot…
They are performing the mummification process (or embalming) of Hebtepere. This involves religious rituals (priest praying) and physical/chemical steps (handling the body, using s…
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question 6 given the following two reactions: 2a + b ⇌ 3c δhrxn = -26 k…
\( \boldsymbol{96 \, \text{kJ}} \)
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a sample of polystyrene, which has a specific heat capacity of $1.880 j…
# Explanation: ## Step1: Recall heat transfer formula The heat lost by the polystyrene (\(q_{polystyrene}\)) is equal to the heat gained by the water (\(q_{water}\)) at constant p…
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what does the law of conservation of matter state? matter has atoms. ma…
B. Matter cannot be created or destroyed. (assuming the second option is labeled B; if the original labels were different, adjust the identifier but keep the text. Since the optio…
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a sample of polystyrene, which has a specific heat capacity of 1.880 j·…
# Explanation: ## Step1: Recall heat transfer formula The heat lost by the polystyrene sample ($Q_{lost}$) is equal to the heat gained by the water ($Q_{gained}$) in a calorimeter…
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a 53.1 g sample of aluminum is put into a calorimeter (see sketch at ri…
# Explanation: ## Step1: Recall heat transfer formula The heat lost by aluminum (\(Q_{Al}\)) equals the heat gained by water (\(Q_{water}\)) in a calorimeter (assuming no heat los…
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a chemist carefully measures the amount of heat needed to raise the tem…
# Explanation: ## Step1: Calculate moles of \( C_5H_{12}S \) First, find the molar mass of \( C_5H_{12}S \). Carbon (C) has a molar mass of \( 12.01 \, \text{g/mol} \), hydrogen (…
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a chemical reaction takes place inside a flask submerged in a water bat…
\( 21.2^\circ C \)
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how would fdrs court - packing scheme have changed the supreme court? i…
A. It would have expanded the Court by allowing the president to appoint new justices when existing justices turned 70.
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a chemical reaction takes place inside a flask submerged in a water bat…
\( 40.8\space ^\circ C \)
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calculate the energy required to heat 514.0 g of cyclohexane from 13.1°…
\boxed{1.13 \times 10^4} (or \boxed{11300} depending on the required format, but in scientific notation with three significant digits, \( 1.13 \times 10^4 \) J is appropriate)
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a chemist carefully measures the amount of heat needed to raise the tem…
\( 0.139 \)
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a chemist carefully measures the amount of heat needed to raise the tem…
\(4.18\)
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complete the following table. be sure each of your answer entries has t…
To solve this, we use the conversion factors: \( 1\ \text{kcal} = 1000\ \text{cal} = 1\ \text{Cal} \) (note: sometimes "cal" can be confusing, but here we use \( 1\ \text{kcal} = …
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describe five factors that affect the rate of chemical reactions.
1. Concentration (or Pressure for Gases): Increases collision frequency of reactant particles. 2. Temperature: Increases particle kinetic energy, collision frequency, and effectiv…
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algae growth typically increases in polluted lakes. the chemicals that …
D. nitrates and phosphates
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gas stoichiometry at stp 2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) you want…
ratio 2
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2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) how many liters of c₂h₂ are requi…
4 L
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2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) assuming the reaction above occur…
1 L $\text{C}_2\text{H}_2$ : 2 L $\text{CO}_2$
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bromothymol blue is an indicator that changes colour at different ph le…
A. lemon juice
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shown here is a portion of the activity table. based on the table, whic…
glycogen and lipids
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the branch of science that studies carbon and its compounds is called s…
organic chemistry
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ammonia is a compound that forms hydroxide ions when it is dissolved in…
base
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two neighboring water molecules are held together by bonds.
hydrogen
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two atoms of uranium that only differ in their number of neutrons are c…
isotopes
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what pressure (in atm) does 3.54 moles of chlorine gas at 376 k exert o…
2.17
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what is the temperature (in k) of 16.45 moles of methane gas in a 70.7 …
245 K
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how many moles of carbon dioxide are contained in 237 l at stp? mol
10.6 (rounded to three significant figures)
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how many moles of fluorine are contained in 116 l at stp? mol
5.18 mol
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how many moles of nitrogen are contained in 18.7 l at stp?
0.835
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which equation satisfies the law of conservation of matter? a) 4o₂+al→a…
D) 3O₂ + 2Al → 2Al₂O₃
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what volume (in liters) does 3.91 moles of nitrogen gas at 4,066 torr a…
19.4
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how many moles of hydrogen gas are contained in 21.3 l at stp? g : p = …
0.951 mol
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elements are placed into the same group on the periodic table of the el…
B) have similar chemical properties
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one mole of an ideal gas occupies ? l at stp.
22.4
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which is true in a covalent bond? a) the bond forms when electrons are …
A) The bond forms when electrons are shared.
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what variable determines which \ value you use in your calculation? mol…
pressure (P)
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standard temperature and pressure (stp) is k and atm.
273.15 K and 1 atm
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19. what chemical has caused a breakdown in the ozone layer? why was th…
The chemical causing ozone layer breakdown is chlorofluorocarbons (CFCs). CFCs were used due to being non - toxic, non - flammable, stable (suitable for refrigeration, aerosol spr…
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2. using the enthalpies of formation and the data below, determine the …
To solve part (a), we follow these steps: ### Step 1: Find the mass of butane burned The mass of butane burned is the initial mass of the burner minus the final mass of the burner…
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energy changes 1. ethene gas, ( c_{2}h_{4(g)} ), is the raw material fo…
The enthalpy change $\Delta H^\circ$ for the reaction is $\boldsymbol{+138\ \text{kJ}}$ (or $138\ \text{kJ}$).
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4. nitric oxide, no_(g), reacts with chlorine gas, cl_(2(g)), in the ba…
The rate law is \( \boldsymbol{\text{Rate} = k[\text{NO}]^2[\text{Cl}_2]} \). The order with respect to \( \text{NO} \) is 2 (from trials 2→3, doubling \( [\text{NO}] \) quadruple…
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a cylinder with a moveable piston initially contains 4.10 l of a gas at…
1.72 atm
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a gas is contained in a thick - walled balloon with an initial temperat…
409 K (or 409.05 K)
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a gas is contained in a thick - walled balloon under the conditions 2.9…
2.57 atm
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a cylinder with a moveable piston contains 1.0 l of gas. when the initi…
1.3 L (rounded to two significant figures) or 1.29 L (more precise)
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part vi: name the following covalent compounds containing all nonmetals…
## PART VI: | Formula | Name | Formula | Name | | ---- | ---- | ---- | ---- | | \(P_4O_{10}\) | Tetraphosphorus decoxide | \(Cl_2O_7\) | Dichlorine heptoxide | | \(PF_3\) | Phosph…
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a gas is contained in a thick - walled balloon under the conditions 777…
342 torr
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which equation represents the combined gas law? \\( \\frac { p _ { 1 } …
\( \frac{P_1V_1}{n_1T_1} = \frac{P_2V_2}{n_2T_2} \)
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name partners part vi: name the following covalent compounds containing…
- **Part VI**: - \(P_4O_{10}\): Tetraphosphorus decoxide - \(PF_3\): Phosphorus trifluoride - \(N_2O\): Dinitrogen monoxide - \(Cl_2O_7\): Dichlorine heptoxide - \(BI_3\): Boron t…
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combined gas law a gas is contained in a thick - walled balloon. the sy…
280 K
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combined gas law ntained in a thick - walled e temperature of the room …
moles
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what temperature units should be used when performing calculations usin…
K only
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caco₃(aq) + 2hcl(aq) → cacl₂(aq) + h₂o(l) + co₂(g) 12. how much 0.80 m …
0.10 L (or 100 mL)
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part vi: name the following covalent compounds containing all nonmetals…
## PART VI: - \(P_4O_{10}\): Tetraphosphorus decoxide - \(Cl_2O_7\): Dichlorine heptoxide - \(PF_3\): Phosphorus trifluoride - \(BI_3\): Boron triiodide - \(N_2O\): Dinitrogen mon…
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use this equation for the next two problems. h₃po₄(aq) + 3naoh(aq) → na…
Problem 9: 17 mL Problem 10: 0.370 M
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type the correct answer in the box. spell all words correctly. helen ha…
inhalation
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10. if 36.0 ml. of $h_{3}po_{4}$ reacts exactly with 80.0 ml. of 0.500 …
0.370 M
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at stp, what volume is required to hold 3.25 moles of an ideal gas?
72.8 L
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at stp, how many moles of h2 gas are contained within a 112 l container?
5
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what is the volume of 10.0 moles of n2 gas at stp? volume (l)
224 L
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how many moles of ar gas are present in a container with a volume of 78…
3.5
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what is the volume of 225 moles of a gas at stp? hint: be careful of wh…
5040 L
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at stp, what volume is required to hold 6.0 moles of an ideal gas?
134.4 L
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for an ideal gas, 1 mole = ? l at stp.
22.4
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o₂(g) + o(g) → o₃(g) 8. what mass of ozone, o₃, can be produced from 3.…
3.65 g
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which set of conditions represent standard temperature and pressure (st…
273 K and 1 atm