化學
化學反應、化學計量、分子結構與元素性質。
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an arctic weather balloon is filled with 10.7 l of helium gas inside a …
9.78 L
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an arctic weather balloon is filled with 31.5 l of helium gas inside a …
30.8 L
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magnesium oxygen magnesium oxide electrons? lost or gained? charge of m…
### For the table (Stop and Think section): - **Magnesium (Mg)**: - # protons: \(12\) - # electrons: \(12\) - # valence electrons: \(2\) - Metal or non - metal: \(M\) - To get a f…
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a sealable bag holds 3.79 l of gas. how many moles of h₂ gas are needed…
0.16 (rounded to two decimal places) or 0.158 (unrounded)
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2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) how many liters of c₂h₂ are requi…
134.4 L C₂H₂
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consider the reaction for the combustion of acetylene. 2c₂h₂(g) + 5o₂(g…
26.4
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what volume (in liters) does 4.76 moles of xenon occupy at stp? ? l
106.624
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how many moles of fluorine are contained in 116 l at stp? ? mol
5.18 (rounded to two decimal places) or 5.1786 (unrounded)
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during a chemical reaction a chemical bonds break. b matter is destroye…
A. chemical bonds break
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which chemical equation represents a double replacement reaction? a agn…
A. \(AgNO_3 + NaCl \to AgCl + NaNO_3\)
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a cylinder with a moveable piston contains 4.78 l of a gas at 417 mm hg…
2.70 L
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which of the following represents a synthesis reaction? a $2h_2 + o_2 \…
A. \(2H_2 + O_2 ightarrow 2H_2O\)
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what is the volume of 0.58 moles of h₂ gas at stp?
13.0 L
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how many moles of o₂ are in a container with a volume of 67 l at stp? m…
3.0
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an arctic weather balloon is filled with 47.6 l of helium gas inside a …
44.4
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5.0 moles of gas take up 15.0 l of space under a set of constant pressu…
6.0 L
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which type of reaction is represented by the following chemical equatio…
C. combustion reaction
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3.25 moles of gas take up 40.0 l of space under constant pressure and t…
15.4 L
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the gas pressure inside an ordinary vacuum chamber is 0.500 torr. calcu…
0.500 mmHg, 0.000658 atm
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which statement best describes what occurs during a chemical reaction? …
C. The bonds in reactants break so that elements can rearrange and form new products.
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a gas at 110 °c exerts a pressure of 225 torr in a sealed container. th…
199
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calcium chloride reacts with sodium to produce sodium chloride and calc…
C. Single Displacement
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nitrogen gas at 298 k and 75.5 kpa increases in pressure to 175 kpa. wh…
691 K
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the vapor pressure of ethanol at 25 °c is 58.7 mmhg. calculate the vapo…
0.0772 atm 58.7 torr
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which statement(s) is/are true for all chemical reactions? select all t…
A. Energy is released when bonds are formed. B. Reactant elements and/or compounds rearrange to form chemically new products. C. Energy is absorbed when bonds are broken.
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a gas with an unknown volume is originally 588 k. when the volume of th…
688 mL
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the vapor pressure of water at 5 °c is 0.00861 atm. calculate the vapor…
6.54 mmHg 6.54 torr
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the volume of a container expands when it is heated from 159 k to 456 k…
5.40 L
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the substances produced in a chemical reaction are called ______. enter…
products
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what is the pressure when a gas at 215 torr in a 51.0 ml vessel is redu…
593 torr
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read the stanza below from the poem \ballad of birmingham\ by dudley ra…
ABAB
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5. your friends say that they saw a special nail polish that changes co…
5. Yes. The nail polish can take in energy from the light, causing it to change color 6. Because the filling material can take in energy from ultraviolet light, but not from the l…
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a cylinder is filled with 10.0 l of gas and a piston is put into it. th…
218 kPa
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a gas that exerts a pressure of 6.20 atm in a container with an unknown…
475 mL (rounded to reasonable significant figures)
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consider the formation of liquid water through the following reaction: …
54L (the option with 54L)
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chemical bonding: ionic and covalent bonds i. what is an ion? a. ______…
s (filling in the blanks): ## I. What Is An Ion? A. $\boldsymbol{\text{Ion}}$ - atom that has lost or gained electrons and now has a charge. B. Can be $\boldsymbol{\text{cation}}$…
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a sealed vessel containing argon, oxygen, and nitrogen has a total pres…
1.20
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consider the formation of liquid water through the following reaction: …
54L (corresponding to the option "54 L")
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you have a mixture of 5.9 g of n₂ and 6.2 g of o₂. what is the mole fra…
\( 0.52 \)
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a sealed vessel contains 15 kpa chlorine and 89 kpa fluorine in additio…
101
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what happens when a higher number of gas particles collide with the wal…
the pressure increases
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a gas occupies 5,020 ml when held at 91 °c and 1.7 atm. how many moles …
\( 0.29 \)
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1. a rug sits in a sunny place on the floor for a long time. kiara thin…
1. Yes. The rug can take in energy from the light, causing the rug's color to fade. 2. Because the glue can take in energy from the light from the sun but not from the light from …
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according to kinetic molecular theory, what is temperature? the number …
the average kinetic energy of the particles
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which of the following relationships are direct? □ pressure-temperature…
- pressure - temperature - volume - temperature - volume - amount
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what is an elastic collision in kinetic molecular theory? the total kin…
The total kinetic energy of two gas atoms is the same before and after a collision.
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a sealable bag holds 3.79 l of gas. how many moles of h₂ gas are needed…
0.16 (rounded to two decimal places) or 0.158 (unrounded)
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what answer is not an example of an energy transformation? flashlight b…
utility wires moving electrical energy from one location to another
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2n₂(g) + 5o₂(g) → 2n₂o₅(g) if 3.22 moles of n₂ react, what volume of n₂…
72.128 L
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2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) how many liters of c₂h₂ will reac…
107.52
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how many moles of nitrogen are contained in 18.7 l at stp? ? mol
0.835
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what volume (in liters) does 4.76 moles of xenon occupy at stp? ? l
106.624
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a cylinder with a moveable piston contains 3.5 l of gas at 310 k and 2.…
6.4 L
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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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batteries contain a gel, liquid solution, or solid ______ that allows c…
electrolyte
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how many moles of cl₂ are in a container with a volume of 7.5 l at stp?
0.34 (rounded to two decimal places)
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a flexible container holding 4.00 moles of a gas contracts from 89.6 l …
2.00
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a large balloon expands from 4.5 l to 9.0 l when additional he is added…
0.60
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a gas in a sealed container at 86.0 °c decreases in temperature to 30.0…
2.13
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a sample of gas goes from an unknown pressure at 315 k to 2.64 atm at 4…
1.75
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the temperature of a gas changes from 765 k to 315 k. what is the final…
406 mL
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what is an example of mechanical energy? chemicals reacting inside a ba…
water flowing through turbines in a dam
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energy stored because of an object’s height above the earth’s surface i…
C. gravitational
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what is the new volume when an expandable 4.51 l container of gas at 27…
9.02 L
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a gas exerts a pressure of 125.0 mm hg in a container with an unknown v…
0.5394 L
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a 4.60 l container with a moveable piston has a pressure of 845 mm hg. …
367 (rounded to three significant figures)
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a sealed vessel containing carbon monoxide, carbon dioxide, and oxygen …
0.47 atm
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ozone molecules in the stratosphere absorb much of the harmful radiatio…
5.51×10¹⁹ molecules (corresponding to the first option: 5.51×10¹⁹ molecules)
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a flask contains oxygen, carbon dioxide, and nitrogen gases. the partia…
25.7
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na₂co₃ + 2hcl → 2nacl + h₂o + co₂ na₂co₃: 106 g/mol a sealed container …
1.431
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nahco₃ + hcl → nacl + h₂o + co₂ nahco₃: 84.01 g/mol a particular sealed…
21.9 g NaHCO₃
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what is the mole fraction and partial pressure of co₂ in a sample of ga…
Mole fraction (\( x \)) of \( \text{CO}_2 \approx 0.030 \), Partial pressure (\( p_{\text{CO}_2} \)) \( \approx 0.172 \, \text{atm} \) (or more accurate values based on precise ca…
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3.60 moles of gas are held in a sealed 5.73 l container at 301 k. what …
15.5 atm
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a sealed container can hold 6.28 l co₂ at 1.00 atm and 293 k. how many …
0.261 mol CO₂
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mg + 2hcl → mgcl₂ + h₂ (mg: 24.3 g/mol) the number of moles of gas need…
3.89 (rounded to two decimal places) or 3.888 g
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do now - 12/1/25 why do elements form compounds?
The subfield is Chemistry (under Natural Science). Elements form compounds to achieve greater stability by attaining a stable electron configuration (e.g., noble gas electron arra…
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nahco₃ + hcl → nacl + h₂o + co₂ mm nahco₃ = 84.01 g/mol you previously …
1.13 g (rounded to two decimal places) or 1.134 g (more precise)
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a sealed container can hold 0.325 l of gas at 1.00 atm and 293 k. use t…
0.0135 mol gas
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3.60 moles of gas are held in a sealed 5.73 l container at 301 k. what …
15.5 atm
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determine the total pressure, in kpa, in a 2.50 - l vessel containing t…
516
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zn + 2hcl → zncl₂ + h₂ zn: 65.38 g/mol a 3.79 l container can hold 0.15…
9.81 (rounded to two decimal places)
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nahco₃ + hcl → nacl + h₂o + co₂ nahco₃: 84.01 g/mol a particular sealed…
21.9
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what is the mole fraction and partial pressure of ch₄ in a sample of ga…
Mole fraction of \( CH_4 \) is approximately \( 0.246 \), partial pressure of \( CH_4 \) is approximately \( 1.42 \) atm (rounded to two decimal places).
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mg + 2hcl → mgcl₂ + h₂ (mg: 24.3 g/mol) the number of moles of gas need…
3.9
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consider the formation of nitrogen dioxide from nitric oxide and oxygen…
11.0
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nahco₃ + hcl → nacl + h₂o + co₂ mm nahco₃ = 84.01 g/mol you previously …
1.13 (rounded to two decimal places) or 1.134 g (unrounded)
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five samples of argon gas are described in the table below. rank the sa…
- 2.4 mol, 2.9 atm, 11.°C: 5 - 2.1 mol, 1.9 atm, -6.°C: 3 - 1.8 mol, 1.6 atm, -28.°C: 1 - 2.7 mol, 1.1 atm, 3.°C: 4 - 1.7 mol, 2.2 atm, -9.°C: 2
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sodium peroxide (na₂o₂) is used to remove carbon dioxide from (and add …
99
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a sealed container can hold 0.325 l of gas at 1.00 atm and 293 k. use t…
0.0135 mol gas
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five samples of helium gas are described in the table below. rank the s…
Sample1: 4 Sample2: 1 Sample3: 5 Sample4: 2 Sample5: 3
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ozone molecules in the stratosphere absorb much of the harmful radiatio…
5.51×10¹⁹ molecules (Corresponding option: 5.51x10¹⁹ molecules)
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five samples of krypton gas are described in the table below. rank the …
2.9 mol, 2.9 atm, -44°C: 1 1.7 mol, 1.9 atm, -34°C: 2 1.5 mol, 1.7 atm, -32°C: 3 1.4 mol, 1.5 atm, -26°C: 4 2.0 mol, 2.4 atm, -24°C: 5
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at what temperature, in °c, would 1.13 mol of ideal gas occupy 54.7 l, …
\( 865^\circ\text{C} \) (Note: Wait, maybe I made a mistake in calculation? Wait, let's check again. Wait, 1.93 atm, 54.7 L, 1.13 mol. Let's use R=0.0821. Wait, \( T = (PV)/(nR) =…
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a chemist measures the energy change δh during the following reaction: …
1. endothermic. 2. Yes, absorbed. 3. 581 kJ
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a chemist measures the energy change $\\delta h$ during the following r…
This reaction is...: endothermic Suppose 97.8 g of NH₃ react. Will any heat be released or absorbed?: Yes, absorbed If you said heat will be released or absorbed...: 459 kJ
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if 8.85 moles of carbon monoxide gas are present in a container of volu…
\( 7.75 \, atm \) (rounded to three significant figures, as the given values have three or four significant figures, and 8.85 has three, so the answer should have three)
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question 51 1 pt motivational tension that activates behavior to satisf…
C. drive ### Question 52
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what is the volume, in l, of 6.54 moles of an ideal gas at 27.9°c and 2…
78.5
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7.0 g of cream at 10.4 °c are added to an insulated cup containing 100.…
74.2°C
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a gas - filled balloon with a volume of 2.20 l at 1.20 atm and 20.0 °c …
\( 751 \, L \) (rounded to three significant figures)