Answer:
The calculated volume of the gas (in mL) at 20.0c and 740.mmHg when volume of gas collected at temperature of 11.0° C and pressure of 710 mmHg measures 0.148L is 78. 1 mL
Explanation:
The combined gas law combines the three gas laws, Boyle's law, Charles's law and Gay- Lussac's law. It states that the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant.
P V ÷ T = K
P1 × V1 ÷ T1 = P2× V2 ÷ T2
Parameters :
P1 = Initial pressure = 710.0 mmHg
V1 = 0. 148 L , converting it to mL = 0.148L × 1000 = 148 mL
T1 = Initial temperature = 11° C
P2 = Final pressure = 740 mmHg
V2 = Final volume in mL
T2 = Final temperature = 20° C
Calculations:
V2 = P1 × V1 × T2 ÷ P2 × T1
V2 = 710 × 148 × 11 ÷ 740 × 20
V2 = 1155880 ÷ 14800
V2 = 78.1 mL
Therefore, the calculated volume is 78.1 mL
Which is not a conjugate acid-base pair?
Question 1 options:
H3O+ and H2O
H2O and OH-
NH3 and NH2--
NH4+ and NH3
HNO2 and H2O
Answer:
Explanation:
''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''
In a conjugate acid-base pair, only difference between molecules is the amount of ''H''
One molecule must have 1 more H
in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.
What is the wavelength of an electromagnetic wave that has a frequency of
1.82 x 1018 Hz in a vacuum? (The speed of light in a vacuum is 3.00 × 108
m/s.)
O A. 6.07 × 109 m
OB. 5.46 × 1026 m
OC. 5.49 x 10-19 m
OD. 1.65 x 10-10 m
The wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10-¹⁰m.
How to calculate wavelength?The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency.
According to this question, a wave has a frequency of 1.82 x 10¹⁸ Hz in a vacuum and speed of light in a vacuum is 3.00 × 10⁸ m/s.
wavelength = 3 × 10⁸ ÷ 1.82 × 10¹⁸
wavelength = 1.65 × 10-¹⁰m
Therefore, the wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10-¹⁰m.
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Select the correct answer. what is the solution to the problem rounded to the correct number of significant figures? 8.01 × 4.1 = ? a. 32.8 b. 32.84 c. 32.841 d. 33
The solution to the problem rounded to the correct number of significant figures is 32.841. Details about multiplication can be found below.
How to multiply to correct significant figures?Multiplication is the process of computing the sum of a number with itself a specified number of times.
According to this question, a mathematical value of 8.01 is multiplied by 4.1.
8.01 × 4.1 = 32.841 (5 s.f)
Therefore, the solution to the problem rounded to the correct number of significant figures is 32.841.
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What’s the question??
Answer:
the phenotype of TT is the right answer
Two identical metal spheres at 8 °C are put in equal amount of water in two beakers, as shown below.
Two beakers are side by side; one is labeled Beaker A and the other is labeled Beaker B. Both beakers are the same shape, size, and are about two-thirds full with water. Both beakers have a metal sphere with a temperature of eight degrees Celsius submerged in the water.
Heat flows from the metal sphere to the water in Beaker A and from the water to the metal sphere in Beaker B. Which statement is correct? (4 points)
The temperature of the water is greater than 8 °C in Beaker A.
The temperature of the water is lower than 8 °C in Beaker B.
The temperature of the water in Beaker A will increase.
The temperature of the water in Beaker B will increase.
Answer:The temperature of the water in both beakers is greater than 8 °C. in beaker B
Explanation:
What is the total number of moles of solute in 2.0 liters of 3.0 m naoh
a) 1.0 mole
b) 2.0 moles
c) 3.0 moles
d) 6.0 moles
Answer:
d) 6.0 moles
Explanation:
M = moles of solute/liters of solution
3 0M = x/2.0
2.0L×3 0M = x/2.0L×2.0L
6.0 moles = x
Which of the following ions is formed when the positive hydrogen ions from an acid bond to water molecules?
H−
OH−
H2O+
H3O+
Answer:
H20 +
Explanation:
The ion that is formed when the positive hydrogen ions from an acid bond to water molecules is H₂O⁺. The correct option is C.
What are hydrogen ions?
Hydrogen is an element that is present in the first place on the periodic table, and its atom's number is 1. The nucleus of hydrogen contains only one electron, and it contains a positive 1 charge.
Hydrogen is called hydrogen ion when it participates in any chemical reactions. They become charged and participate in electron bonding to form compounds.
The positive Hydrogen ions, when forming a bond to water molecules, will be represented as H₂O⁺ because hydrogen only contains a positive charge on it. The unit positive charge on the hydrogen is the proton present in its nucleus.
Thus, the correct option is C. H₂O⁺
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I WILL MARK BRAINLIEST!!!
A 72.0-gram piece of metal at 96.0 °C is placed in 130.0 g of water in a calorimeter at 25.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal. Show your work by listing various steps, and explain how the law of conservation of energy applies to this situation.
Answer:
Approximately [tex]0.639\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].
Explanation:
Look up the specific heat of water:
[tex]c(\text{water}) = 4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].
It is given that the mass of the water in this calorimeter is:
[tex]m(\text{water}) = 130.0\; {\rm g}[/tex],
The temperature of the water in this calorimeter has increased by:
[tex]\Delta T(\text{water}) = (31.0 - 25.5)\; {\rm K} = 5.5\; {\rm K}[/tex].
Thus, the energy that the water in this calorimeter absorbed would be:
[tex]\begin{aligned}& Q(\text{water})\\ =\; & c(\text{water}) \, m(\text{water}) \, \Delta T(\text{water}) \end{aligned}[/tex].
Let [tex]c(\text{metal})[/tex] denote the specific heat capacity of this piece of metal.
The mass of this piece of metal is:
[tex]m(\text{metal})[/tex].
The temperature of this piece of metal has been reduced by:
[tex]\Delta T(\text{metal}) = (96.0 - 25.5)\; {\rm K} = 70.5\; {\rm K}[/tex].
As this piece of metal cooled down, the energy it released would be:
[tex]\begin{aligned}& Q(\text{metal})\\ =\; & c(\text{metal}) \, m(\text{metal}) \, \Delta T(\text{metal})\end{aligned}[/tex].
Assuming that there is no exchange of energy between contents of this calorimeter and surroundings. By the law of conservation of energy, energy could neither be created nor destroyed.
Since energy could not be destroyed, the water in this calorimeter need to absorb the entirety of the energy that this piece of metal released. At the same, since no energy isn't created, the energy that the water absorbed would need to entirely come from this piece of metal. Therefore:
[tex]Q(\text{metal}) = Q(\text{water})[/tex].
[tex]\begin{aligned}& c(\text{water})\, m(\text{water})\, \Delta T(\text{water}) \\&= c(\text{metal})\, m(\text{metal})\, \Delta T(\text{metal}) \end{aligned}[/tex].
Rearrange and solve this equation for [tex]c(\text{metal})[/tex]:
[tex]\begin{aligned}& c(\text{metal}) \\=\; & \frac{c(\text{water}) \, m(\text{water})\, \Delta T(\text{water})}{m(\text{metal})\, \Delta T(\text{metal})} \\ =\; & \frac{4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 130.0\; {\rm g} \times (31.0 - 25.5)\; {\rm K}}{72.0\; {\rm g} \times (96.0 - 25.5)\; {\rm K}} \\ \approx\; & 0.639\; {\rm J \cdot g^{-1}\cdot K^{-1}}\end{aligned}[/tex].
At home, your parents replace your house lights with lower-watt bulbs. Is this energy conservation or energy sustainability? Explain
This is actually electricity
The replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
What is energy conservation?Energy conservations refer to the practice of using less energy for doing various activities. Turning off the light when you leave the room is the example of energy conservation.
So we can conclude that replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.
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Sally fell off of her bike and scraped her knee. What cellular process would aid in the healing of her scrape? Group of answer choices meiosis mitosis
Answer:
Mitosis
Explanation:
you scrape your knee and the skin repairs itself
3 Apply Use context clues to write your own definitions for the words definite and occupy.
Example sentence
Solid is the state of matter that has a definite shape and volume.
definite:
__________
Example sentence
A larger container will allow a gas to occupy more space.
occupy:
__________
Answer:
Explanation:
own definitions for the words definite and occupy.
Example sentence
Solid is the state of matter that has a definite shape and volume.
definite:
__________
Example sentence
A larger container will allow a gas to occupy more space.
occupy:
describe one advantage and one disadvantage of obtaining energy from nuclear fission
Answer:
one advantage: no air pollutants, one disadvantage: gives off radioactive waste
What is the mass of 61.9 L of oxygen gas collected at STP?
a 122 g 02
b 2.76 g 02
C 88.4 g 02
d 44.2 g 02
Answer:
D. 44.2 g O₂
General Formulas and Concepts:
Gas Laws
Stoichiometry
Dimensional AnalysisMole RatioExplanation:
Step 1: Define
Identify given.
61.9 L O₂ at STP
Step 2: Convert
We know that the oxygen gas is at STP. Therefore, we can set up and solve for how many moles of O₂ is present:
[tex]\displaystyle 61.9 \ \text{L} \ \text{O}_2 \bigg( \frac{1 \ \text{mol} \ \text{O}_2}{22.4 \ \text{L} \ \text{O}_2} \bigg) = 2.76339 \ \text{mol} \ \text{O}_2[/tex]
Recall the Periodic Table (Refer to attachments). Oxygen's atomic mass is roughly 16.00 grams per mole (g/mol). We can use a mole ratio to convert from moles to grams:
[tex]\displaystyle 2.76339 \ \text{mol} \ \text{O}_2 \bigg( \frac{16.00 \ \text{g} \ \text{O}_2}{1 \ \text{mol} \ \text{O}_2} \bigg) = 44.2143 \ \text{g} \ \text{O}_2[/tex]
Now we deal with sig figs. From the original problem, we are given 3 significant figures. Round your answer to the exact same number of sig figs:
[tex]\displaystyle 44.2143 \ \text{g} \ \text{O} \approx \boxed{ 44.2 \ \text{g} \ \text{O}_2 }[/tex]
∴ our answer is letter choice D.
---
Topic: AP Chemistry
Unit: Stoichiometry
7 Calculate What is the atomic number of a sodium atom that has 11 protons and 12 neutrons?
Answer:
22 and 24
Explanation:
neutron i is bigger thañ protons
Compounds that contain carbon-hydrogen bonding are collectively termed.
Answer:
collectively they're known as HYDROCARBONS
The original amount of a radioactive sample should be multiplied by which expression to calculate the amount of the sample that remains after n half-lives have passed? (one half) times n. (startfraction 1 over n endfraction) squared. (one half) superscript n. startfraction 1 over (2 n) endfraction.
The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.
What is half-life?This is the time taken for half a substance to decay.
Description of number of half-livesThe number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:
N = N₀ × (½)ⁿ
Where
N is the amount remainingN₀ is the Original amount n is the Number of half-livesFrom the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n
to calculate the amount remaining.
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Answer:
c. (1/2)^n
Explanation:
When a chemical reaction occurs, what happens
to the atoms of the two reactants
Use the word bank below to complete the statement. Not all of the words will be used.
Word Bank:
sum. Enthalpy. Heat. Total.
Temperature. Moles. -ΔH. +ΔH.
Hess’s Law describes how the ____ energy of a reaction consists of the ___ of the energy changes of the individual step reactions.
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
What is the statement if Hess's law of constant heat summation?Hess's law of constant heat summation states that the total heat changes that occur in a reaction is independent of the several intermediate pathways of the reaction, but is a sum of all the heat changes that occur.
Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.
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Joanne added iron filings to copper sulphate solution. she observed the reaction after one week. what is the name of the compound formed in this reaction?
The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.
Copper sulfate + Iron reactionThe reaction between iron filings and copper sulfate is represented by the equation below:
[tex]Fe + CuSO_4--- > FeSO_4 + Cu[/tex]
The iron filings displace the copper from copper sulfate to form iron sulfate. Thus, elemental copper and iron sulfate are formed.
Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.
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What is effect of temperature on solubility?
detail please.
In general, solids become more soluble as the temperature increases. This is why sugar dissolves better in hot water than in cold water. The table shows three examples of the solubility (g of solute per 100 g water) of substances at different temperatures.
that's my answer? Question
Given:
H₂ + Br₂ → 2HBr
Bond
Bond Energy
(kJ/mol
H-H
432
Br-Br
190
H-Br
362
Calculate the enthalpy change when hydrogen reacts with bromine.
Type the correct answer in the box. Express the answer to three significant figures e.
ΔΗ =
kj
Answer:-102
Explanation:The equation shows that 1 mole of H-H bonds and 1 mole of Br/Br vines are broken from 2 miles of H-Br bonds
Answer: -102
Explanation:
When salt is mixed in water, what is the salt and water? A)salt is the solution, water is the solute. B)salt is the solvent, water is the solute. C)salt is the solute, water is the solvent. D)salt is the solvent, water the is the solution
Answer:
in a solution of salt in water, the solute is salt, and solvent is water.
Explanation:
C) salt is the solute, water is the solvent.
Answer:
C
Explanation:
:)
Why is the bermuda triangle deadly? or is it just a myth?
Answer:
Its neither a myth nor deadly
Explanation:
Bizarre hexagonal clouds forming above the Bermuda Triangle may be the reason why dozens of ships and planes have mysteriously vanished in the notorious patch of sea, according to scientists.
According to the new theory, clouds over the Bermuda Triangle are like “air bombs” strong enough to cause ship and plane wrecks. The strange “hexagonal” shaped clouds were discovered using radar satellite imagery, which were between 20 and 50 miles wide forming over the water.
15. Identify What types of bonds are present in an alkyne?
Answer:
Alkyne are hydrocarbons which contain carbon-carbon triple bonds.
Which functional group is found in methanol? r single bond o single bond r. single bond n h subscript 2 single bond o h. r single bond x.
The functional group found in methanol is as follows: R single bond OH (R-OH). Details about methanol can be found below.
What is functional group?A functional group is a specific grouping of elements that is specific to a class of compounds, and determines the chemical properties of that class.
Each hydrocarbon or organic compound have a specific functional group characteristics of its group.
Alcohol (OH) is the functional group of certain organic compounds like methanol, ethanol etc. Therefore, the functional group found in methanol is as follows: R single bond OH (R-OH).
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Answer:
R single bond O single bond R.
Single bond N H Subscript 2
Single bond O H.
R single bond X.
Explanation:
Use the information in the tables to determine whether the solution of the salt formed from the given acid base combinations will be acidic, basic, or neutral. hcl naoh: hcl nh4oh: ch3cooh koh:
The table should be included, but that's okay
hcl naoh: salt neutral (both strong)
hcl nh4oh: salt acidic(strong acid+weak base)
ch3cooh koh: salt basic(weak acid+strong base)
Question progr
when the reactants have less enthalpy than the products, then
a. none of these
ob. the reaction will be complete
c. heat energy is given out
d. heat energy is absorbed
What is the process of removing salt from seawater.
Answer:
Explanation:
Process of desalination is used to remove salt from seawater for provision of fresh water
Convert 65 grams of oxygen to moles
65 grams of oxygen is approximately equal to 2.03125 moles.
To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.
The formula for converting grams to moles is:
Moles = Mass (in grams) / Molar mass (in grams per mole)
Given:
Mass of oxygen = 65 grams
Molar mass of oxygen (O₂) = 32.00 g/mol
Moles of oxygen = 65 grams / 32.00 g/mol
Moles of oxygen ≈ 2.03125 moles
Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.
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distance in space is measured in