Answer:
A
Explanation:
nitrogen has the similar properties because carbon is the opposite of oxygen
please help me with Chem I ONLY HAVE 5 MINUTES if methane gas (CH4) flows at a rate of 0.25L/s, how many grams of methane gas will there be in a room after 1 hour of time has passed?
Answer:
643g of methane will there be in the room
Explanation:
To solve this question we must, as first, find the volume of methane after 1h = 3600s. With the volume we can find the moles of methane using PV = nRT -Assuming STP-. With the moles and the molar mass of methane (16g/mol) we can find the mass of methane gas after 1 hour as follows:
Volume Methane:
3600s * (0.25L / s) = 900L Methane
Moles methane:
PV = nRT; PV / RT = n
Where P = 1atm at STP, V is volume = 900L; R is gas constant = 0.082atmL/molK; T is absolute temperature = 273.15K at sTP
Replacing:
PV / RT = n
1atm*900L / 0.082atmL/molK*273.15 = n
n = 40.18mol methane
Mass methane:
40.18 moles * (16g/mol) =
643g of methane will there be in the room4. What characteristic of an element differs between isotopes?
a. Negative charge
b. Mass
c. Positive charge
d. All of the Above
The characteristic of an element that differs between isotopes is the Mass (Option b).
What are isotopes?Isotopes are elements that exhibit an equal atomic number but distinct nucleonic number.
Isotopes contain different numbers of protons in their atomic nuclei (atomic weight).
In conclusion, the characteristic of isotopes is the Mass (Option b).
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The molar mass of lithium carbonate is equal to 73.9 g/mol. Answer the following questions. 1) What mass of lithium carbonate is required to prepare 500.0 mL of a 0.250 M Li2CO3 solution
Answer:
9.2375 grams of lithium carbonate is required to prepare 500.0 mL of a 0.250 M Li₂CO₃ solution.
Explanation:
Molarity is a measure of the concentration of a substance and is defined as the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
molarity= 0.250 Mnumber of moles of solute= ?volume= 500 mL= 0.5 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]0.250 M=\frac{number of moles of solute}{0.5 L}[/tex]
Solving
0.250 M*0.5 L = number of moles of solute
0.125 = number of moles of solute
If the molar mass of lithium carbonate is equal to 73.9 g/mol, then the required mass of the compound can be calculated by:
[tex]73.9 \frac{g}{mol}*0.125 moles= 9.2375 grams[/tex]
9.2375 grams of lithium carbonate is required to prepare 500.0 mL of a 0.250 M Li₂CO₃ solution.
The mass of lithium carbonate required to prepare 500.0 mL of a 0.250 M Li₂CO₃ solution is 9250.0 grams.
The molar mass, also known as the molecular weight, is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molar mass of a compound is calculated by adding up the atomic masses of all the atoms in its chemical formula.
Given:
Volume = 500.0 mL = 500.0 cm³
Concentration = 0.250 M (moles per liter)
Molar mass of lithium carbonate (Li₂CO₃) = 73.9 g/mol
Use the formula:
Mass = Volume × Concentration × Molar mass
Substitute the values in the above equation:
Mass = 500.0 cm³ × 0.250 mol/L × 73.9 g/mol
= 9250.0 g
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What is the pressure of a 0.108 mol sample of helium gas at a temperature of 293 K if its volume is 0.505 L?
Answer:
P = 5.14 atm
Explanation:
Given that,
Pressure of the gas, P = 0.108 mol
Temperature, T = 293 K
Volume, V = 0.505 L
We need to find the pressure of the gas. We know that, according to ideal gas equation,
PV = nRT
Where
P is pressure and R is gas constant
[tex]P=\dfrac{nRT}{V}\\\\P=\dfrac{0.108 \times 0.0821\times 293}{0.505}\\\\P=5.14\ atm[/tex]
So, the pressure of the gas is equal to 5.14 atm.
You ran a mile on Monday. Then you ran another mile on Tuesday and your speed was faster. How would your time be different on Tuesday?
Answer:
your mile-time for tuesday would be shorter compared to your mile-time for monday
Explanation:
Answer: Your time on Tuesday would be different because your body has improved from a simple exercise on Monday, allowing your speed to increase; meaning your time will be much faster.
Explanation:
What piece of apparatus could be used to measure the volume of gas produced in a reaction
1)beaker
2)gas syringe
3) top pan balance
Answer: 2)gas syringe
Explanation:
the volume of a gas is usually measured with a gas syringe (or sometimes with an upside-down measuring cylinder)
Answer:
top pan balance
Explanation:
Which term below describes the study of how energy is transferred to
different locations and forms?
A. Thermodynamics
O B. Entropy
C. Enthalpy
D. Chemical reactions
. Six concrete posts are used to support a waterfront pier. Each post has dimensions 14 in x 14 in x 15 ft. The average density of the concrete is 2.4 g/cm3. ( 1g = 1 x 10-6 metric ton)
a. Calculate the volume of concrete (in m3) needed to make one post.
Answer:
0.58 m³
Explanation:
14 in (1 ft/12 in) = (14/12) ft
(14/12) ft×(14/12) ft×15 ft = 20.41 ft³ (1 m³/35.3 ft³) = 0.58 m³
The volume of concrete needed to make one post is 8526 cm3.
What is density?Density= Mass/ Volume
Volume= Density * Mass
= 2.4 * 14* 14* 15 ft
= 2.4 g /cm3 * 2940
= 8526 cm3
The density of a substance is calculated by mass/ volume. Density is directly proportional to mass and inversely proportional to volume. If the mass of the substance increases then the density of the substance also increases, if the volume of the substance increases then the density of a substance decreases.
Therefore, The volume of concrete needed to make one post is 8526 cm3.
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Which of the following is NOT a property of bases? Which of the following is NOT a property of bases? Bases dissolve many metals. Bases turn litmus paper blue. Bases have a slippery feel. Bases have a bitter taste. All of the above are properties of bases.
Bases dissolve many metals.
5. Suppose you add 2.0 mL of 0.10 M HCl to 100 ml of buffer having 0.10 M HA and 0.20 M NaA. The pKa of the acid HA is 4.82. a. Which species will react strongly with one another
Answer:
The HCl react strongly with NaA
Explanation:
The buffer is an aqueous mixture of a weak acid and its conjugate base, or vice versa.
In the problem, you have the weak acid, HA, in a mixture with the conjugate base, NaA. A strong acif as HCl is added. The acids react with bases, the only base present is NaA, that means:
The HCl react strongly with NaA
The reaction is:
HCl + NaA → NaCl + HA
How many neutrons are in an atom of argon–40?
Answer:
22 neutrons
Explanation:
If so please sorry
A substance in a specific state of matter with volume of 6 liters was transferred to a 12 liter container. The substance took up the
A. It is highly compressible.
B. It also has a definite shape.
C.Its particles slide past one another
D. Its intermolecular forces are of high strength.
[tex]\huge\color{yellow}\boxed{Answer:}[/tex]
My answer is C.Its particles slide past one another
[tex]\huge\color{yellow}\boxed{toshiro hitsugaya}[/tex]
When the 6 liters volume of the substance takes up 12 liter container, we conclude that the substace is highly compressible.
What is compressibility?
Compressibility is the measure of the relative volume change of a solid or a fluid with respect to pressure change.
Gases are the most compressible susbtance because most of the volume of a gas is composed of the large amounts of empty space between the gas particles.
Therefore, when the 6 liters volume of the substance takes up the entire volume of 12 liter container, we can conclude that the substace is highly compressible.
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Au2S3 + 3H2
2Au + 3H2S
Answer:
20auhhdkdkkdJkrijsuofsyo
Identify the conjugate base in the equation below
CH3COOH + H2O - H30* + CH3COO-
O a. CH3COO
O b. H20
O c. H30+
O d. CH3COOH
Answer:
a. CH3COO⁻.
Explanation:
Hello there!
In this case, according to the given ionization reaction of acetic acid:
CH₃COOH + H₂O --> H₃O⁺ + CH₃COO⁻
Whereas we can evidence how the CH₃COOH is the acid whereas H₂O the base, as the former donates H ions to the latter, which accepts them; we can infer that H₃O⁺ is the conjugate acid, resulting from the base and the a. CH3COO⁻ is the conjugate base, resulting from the acid.
Best regards!
Explain what it means for radioactive rays to be able to ionize matter?
Answer:
What is ionizing radiation? Ionizing radiation is radiation with enough energy that to remove tightly bound electrons from the orbit of an atom, causing that atom to become charged or ionized.
The compound AlP (aluminum phosphide) is a compound semiconductor having mixed ionic and covalent bonding. Calculate the fraction of bonding that is ionic.
Answer:
0.086
Explanation:
The formula for calculating the fraction of a covalent bond can be expressed as:
= exp (-0.25ΔE²)
[tex]= exp[-0.25(E_{Al}-E_{p})^2]---(1)[/tex]
from the equation above;
[tex]E_{Al}[/tex] = the electronegativity of aluminum
[tex]E_P[/tex] = electronegativity of phosphorus
Using the data from periodic table figures;
[tex]E_{Al}[/tex] = 1.5
[tex]E_P[/tex] = 2.1
∴
fraction of the covalent = exp[-0.25(1.5 - 2.1)²]
fraction of the covalent = exp(-0.09)
fraction of the covalent = 0.914
Now, the fraction of ionic bond will be = 1 - the fraction of covalent bond
= 1 - 0.914
∴
the fraction of bond that is ionic = 0.086
Plss hellp which law is that?
Answer:
law of motion
Explanation:
Answer:
it is a inertia of motion because the person inside a moving bus falls forward if it is stopped suddenly.
Explanation:
(i)Write two observations when lead nitrate is heated in a test tube.
(i)Name the type of reaction.
(ii)Write a balance chemical equation to represent the above reaction.
Answer:
i-When lead nitrate is heated, it decomposes into lead oxide (PbO), nitrogen dioxide (NO2), and oxygen gas (O2). The type of this reaction is thermal decomposition reaction.
How to do 3 and 4 questions
Answer:
3) Q = -836.8 J.
4) Q = 950J.
Explanation:
Hello there!
In this case, for those calorimetry problems, we use the general equation:
[tex]Q=mC\Delta T[/tex]
Thus, we proceed as follows:
3) Here, the temperature difference is from 80 °C to 40 °C, the mass is 5.0 g and the specific heat 4.184 in SI units; thus, the heat is calculated as follows:
[tex]Q=(5g)(4.184\frac{J}{g\°C} )(40\°C-80\°C)\\\\Q=-836.8J[/tex]
4) Here, the temperature difference is from 100 °C to 200 °C, the mass is 5.0 g and the specific heat about 1.90 in SI units; thus, the heat is calculated as follows:
[tex]Q=(5g)(1.90\frac{J}{g\°C} )(200\°C-100\°C)\\\\Q=950J[/tex]
Regards!
Pbo.....
= 2Pb +......
Answer:
It's
Explanation:
Pbo + c
= pb + co2
While balancing it becomes
2pbo + c = 2pb + co2
(I was also doing same qn)
does isomers have the same physical and chemical properties
Isomers are compounds with different physical and chemical properties but the same molecular formula. ... Structural isomers have the same molecular formula but a different bonding arrangement among the atoms. Stereoisomers have identical molecular formulas and arrangements of atoms.
which best describes the type of titration for the graph below? O strong acid titrated with a strong base
O strong base titrated with a strong acid
O weak acid titrated with a strong base
O weak base titrated with a strong acid
Answer:
B. strong base titration with a strong acid
NEED HELP ASAP
Question 7 (5 points)
(05.05 MC)
A synthesis reaction takes place when carbon monoxide (CO) and hydrogen gas (H2) react to form methanol (CH3OH). How many grams of
methanol are produced when 7.0 grams of carbon monoxide reacts with excess hydrogen gas? (5 points)
20 grams
7.0 grams
8.0 grams
6.1 grams
Explanation:
Write the balance equation for the reaction taking place:
CO(g) + 2H2(g) ==> CH3OH ... balanced equation
Find the limiting reactant:
moles CO present = 14 g x 1 mol CO / 28 g = 0.5 moles COmoles H2 present = 1.5 g x 2 mol H2 / 2 g = 0.75 moles H2OBecause according to the balanced equation it takes 2 moles H2 for every 1 mole CO, there isn't enough H2, so it is limiting and will dictate how much CH3OH can be made.
Mass of CH3OH produced = 0.75 moles H2 x 1 mol CH3OH / 2 mol H2 x 32 g CH3OH / mol = 12 g CH3OH
A 48.5 mL sample of gas in a cylinder is warmed
from 18°C to 92°C.
What is its volume at the final temperature? (Assume constant pressure.)
Express your answer in milliliters to three significant figures.
Answer:
60.8 mL
Explanation:
Using Charles law equation;
V1/T1 = V2/T2
Where;
V1 = initial volume (mL)
V2 = final volume (mL)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information given in this question;
V1 = 48.5 mL
V2 = ?
T1 = 18°C = 18 + 273 = 291K
T2 = 92°C = 92 + 273 = 365K
Using V1/T1 = V2/T2
48.5/291 = V2/365
Cross multiply
291 × V2 = 48.5 × 365
291 V2 = 17702.5
V2 = 17702.5 ÷ 291
V2 = 60.8 mL
Name the following alkene:
CH3CH = CHCH2CH3
A. 3-pentane
B. 2-pentene
C. 2-pentane
D. 3-pentene
Answer:
2-pentene
Explanation:
The name of the alkene is 2 pentene. The correct option is B, 2-pentene.
What is 2-pentene?Alkenes with the chemical formula [tex]C_5H_10[/tex] are known as pentene. Within its molecular structure, each has one double bond.
The given alkene [tex]CH_3CH = CHCH_2CH_3[/tex] is 2-pentene because the double bond is present in the second carbon and it's pentene because there are five carbons present.
Thus, the correct option is B. 2-pentene.
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Which of the following are TRUE about why proteins are important for our body?
Group of answer choices
Proteins give structure to our hair and nails.
Proteins make up hormones and antibodies.
Proteins make up digestive enzymes, like lipase, amylase, and pepsin which aid in breaking down our food.
The protein, insulin, helps carry out muscle contraction.
The protein, myosin, helps carry out muscle contraction.
The protein, hemoglobin, carries substances throughout our body and is a key part of our ciruclatory system.
Answer:
The protein,hemoglobin,carries substances throughout our body and js a key part of our curuclatory syatem
Explanation:
yan lang po alam ko di ko po sure eh
is a glow stick Endothermic or exothermic ?
Answer:
exothermic
Explanation:
The cis configuration has the substituted groups on opposite side of the double bond
true or false?
Answer:
False.
Explanation:
Hello there!
In this case, according to the attached picture, it is possible for us to evidence that cis- isomers have the substituted groups on the same side of the double bond whereas the trans- isomers have the substituted groups on the opposite side of the double bond.
In such a way, we infer that the given statement is FALSE, because that is the definition for the trans configuration.
Regards!
Will give brainliest
If it is 9 am in San Francisco, is it also 9 am in New York? Why or why not?
Answer:
no
Explanation:
Becasue time zones, San Fransico is in the west while New York is in the north New York is 3 hours ahead of California
When the ocean absorbs CO2, the pH of the ocean water drops. What's the
effect of this process?
A. The hydrogen ion concentration increases.
B. The amount of water in the ocean increases.
C. The hydroxide ion concentration increases.
O D. The balance of H+ and OH ions is the same.
SUBMIT
Answer:
the amount of water
in the ocean increases
Answer:
A. The hydrogen ion concentration increases.