Answer:
64.7
Explanation:
Answer:
64.7 is the answer
hope this helps
have a good day :)
Explanation:
A sample of metal has a mass of 16.12 g, and a volume of 4.87 mL. What is the density of this metal?
Answer:
3.31 g/cm³
Explanation:
1000cm³ = 1L
4.87mL = 4.87 × 10^-3 × 1000 = 4.87 cm³
density = mass/volume = 16.12/4.87 = 3.31 g/cm³
I need help please please
Answer:
B should be the answer, and ur low-key valid lol
Explanation:
How to frick a chicken...
Answer:uhhhhh should I be concerned
Explanation:
Answer:
hmmm o_O Maybe you... shouldnt
Early chemists, known at the time as alchemists, had a difficult time understanding the Law of Conservation of Mass. Using the burning of wood as an example, what property of matter made this law difficult for early scientists to understand?
The law of conservation of mass states that, for any isolated system, the mass can neither be created nor be destroyed
After burning a log, the remains that are left behind after it burns are lesser than what would initially seem. There is a difference in mass before the burning of the log after the burning of the log. This seems like a violation of the law of conservation of mass, which would have made it difficult for early chemists to understand it. But if we consider the surroundings as a system then we can see that the mass that is lost in burning is actually converted into smoke and energy or forming other forms of substances. Then considering the whole system we can see that the mass and energy are conserved and interrelated.learn more about conservation of mass and energy:
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The Rock Cycle moves in a specific order. True or
False
Answer:
it is false
Explanation:
it goes in different ways not in order
what do liquid methane and liquid water have in common
Answer:
methane on the other hand is made of one carbon atom and 4 hydrogen atoms. like water, the bonds are covalent.
Liquid methane and Liquid water are both covalent compounds, thus, they both have covalent bonds in common.
What is methane?Methane is a covalent compound which exists as a gas at room temperature.
Methane is composed of four hydrogen atoms and a carbon atom linked together by covalent bonds.
What is water?Water is a covalent compound which exists as a liquid at room temperature.
Water is composed of two atoms of hydrogen and one atom of oxygen linked together by covalent bonds.
What do liquid methane and Liquid water have in common?Since both liquid water and liquid methane are covalent compounds, they both have covalent bonds in common.
Therefore, liquid methane and liquid water have covalent bonds in common.
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What causes lightning?
A. Build up of electric charges in the clouds
B. Flow of electric charges among clouds
C. Light energy created in the clouds
D. Reflection of light by the clouds
Answer:
B.
Explanation:
Not sure if this is correct if not sorry.
a hypothesis is tested by ___.
a. proposing a theory
b. conducting an experiment
c. making further observations
d. talking with other scientists
Answer:
A.
Explanation:
because a theory is like a prediction and a prediction is like a hypothesis.
How do you name ethers in chemistry?
Answer:
Common names of ethers simply give the names of the two alkyl groups bonded to oxygen and add the word ether. The current practice is to list the alkyl groups in alphabetical order (t-butyl methyl ether), but older names often list the alkyl groups in increasing order of size (methyl t-butyl ether).
Explanation:
Hope it is helpful.......
How many mol of C3H8 are consumed when 3 mol of CO2 are produced ?
Answer:
1 mol C₃H₈
Explanation:
Step 1: Write the balanced equation for the combustion of C₃H₈
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₃H₈ to CO₂ is 1:3.
Step 3: Calculate the moles of C₃H₈ consumed when 3 moles of CO₂ are produced
We will use the established molar ratio.
3 mol CO₂ × 1 mol C₃H₈/3 mol CO₂ = 1 mol C₃H₈
There is a 2 percent defect rate at a specific point in a production process. If an inspector is placed at this point, all the defects can be detected and eliminated. The inspector would cost $10 per hour and could inspect units in the process at the current production rate of 48 per hour.
If no inspector is hired and defects are allowed to pass this point, there is a cost of $11 per defective unit to correct the defects later on.
Assume that the line will operate at the same rate (i.e., the current production rate) regardless of whether the inspector is hired or not.
a. If an inspector is hired, what will be the inspection cost per unit? (Round your answer to 3 decimal places.)
Inspection cost per unit _____________$
b. If an inspector is not hired, what will be the defective cost per unit? (Round your answer to 3 decimal places.)
Defective cost per unit _____________$
c. Should an inspector be hired based on costs alone?
Answer:
A) $0.208 per unit
B) $0.220 per unit
C) An inspector should be hired
Explanation:
percentage of defect rate = 2% = 0.02
cost of inspector = $10 per hour
production rate = 48 per hour
cost of not hiring an inspector = $11
A) Determine the inspection cost per unit if an inspector is hired
= cost of inspector / production rate
= 10 / 48 = $0.208 per unit
B) Determine the defective cost per unit if an Inspector is not hired
= cost of not hiring an inspector * percentage of defect rate
= 11 * 0.02
= $0.220 per unit
C) Inspection cost < defective cost i.e. $0.208 < $0.220 hence an inspector should be hired
polycondensation reaction takes place between 1.2 moles of a dicarboxylic acid, 0.4 moles of glycerol (a triol) and 0.6 moles of ethylene glycol (a diol). A.Calculate the critical extents of reaction for gelation using (i) the statistical theory of Flory and (ii) the Carothers theory.B.Comment on the observation that the measured value of the critical extent of reaction is 0.866.
Answer:
(a). (I). 0.816; 0.816
(ii). 0.917.
(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.
Explanation:
So, without mincing words let's get straight into the solution to the question above.
(a). Using the (i) statistical theory of Flory to Determine the critical extent of reaction gelation, one has to make use of the two equations given below;
P(1) = [ v + vb ( n - 2)^-1/2 ------------------(1).
P(2) = v^1/2 [ 1 + b ( n - 2)^-1/2 ----------(2).
The value for v = 1.2 + 1.2/ 1.2 × 2 = 1.
The value of b = (1.2 + 1.2)/ 1.2 = 0.5.
Thus, putting the values into the equation (1) and (2) above gives;
NB: n = 3.
P(1) = [ 1 + 1 × 0.5 ( 3 - 2)^-1/2 = 0.816.
P(2) = 1^1/2 [ 1 + 0.5 ( 3 - 2)^-1/2 = 0.816.
Using the (ii) carother's theory to Determine the critical extent of reaction gelation.
We have the following values for glycerol: k = 0.4, n = 3.
For ethylene glycol; k = 0.6, n = 2.
Therefore, the critical extent of reaction gelation =2/[ (0.6 × 2) + (0.4 × 3) + (1.2 × 2)/ (0.6 + 0.4 + 1.2)] = 2/ 2.18 = 0.917
(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.
why it is necessary to rinse the pipette after washing with water
Answer:Because When you're cleaning your glassware, you use water to rinse it off. If the burette is not completely dry by the time you use it, the remaining traces of water on the inside will make your titrant more dilute and thereby change its concentration.Before a burette is used, it needs to be cleaned. During the cleaning process, usually, water is introduced into the burette. Be the water clean or not, if the burette is then used without rinsing it with the solution that it is going to be filled with, the result of that analytical exercise will not be precise and accurate. The reason is that water residue in the burette would dillute the solution when it's filled in the burette which would make it impossible to determine the exact concentration of the solution moved by the burette. By rinsing and re-rinsing the burette several times with the solution it is going to be filled with, residue water from the cleaning process would be successfully removed from the burette as are other leftover substances from the cleaning process.
hope this helps have a nice night ❤️❤️❤️
Explanation:
Given a sample of poly[ethylene-stat-(vinyl acetate)] A.Calculate the mean repeat unit molar mass for a sample of poly[ethylene-stat-(vinyl acetate)] that comprises 12.9 wt% vinyl acetate repeat units.B.Given that its number-average molar mass is 39,870 g/mol, calculate the number-average degree of polymerization of the copolymer.
Answer:
a) The mean repeat unit molar mass for PEVA is 30.72 g/mol
b) degree of polymerization of the copolymer is 1300
Explanation:
Given that;
the wt% of copolymer consist of 12.9 wt% of vinyl acetate and 87.1 wt% Ethylene.
Basis: 100 g of PEVA consist of 12.9 of vinyl acetate and 87.1g of Ethylene.
now we calculate the mole fraction of vinyl acetate Ethylene in the copolymer;
the molecular weights of vinyl acetate and ethylene are 86.09 g/mol and 28.05 g/mol respectively
so
moles of vinyl acetate = wt. of vinyl acetate / molecular weights of vinyl acetate
moles of vinyl acetate = 12.9 g / 86.09 g/mol
moles of vinyl acetate = 0.1498 mol
moles of Ethylene = wt. of Ethylene / molecular weights of Ethylene
moles of Ethylene = 87.1 g / 28.05 d/mol
moles of Ethylene = 3.1052 mol
Total moles = 0.1498 mol + 3.1052 mol = 3.255 mol
Next we calculate the mole percent;
mole percent of vinyl acetate [tex]X_{V}[/tex] = moles of vinyl acetate / total moles
[tex]X_{V}[/tex] = (0.1498 mol / 3.255 mol) × 100
[tex]X_{V}[/tex] = 4.6%
mole percent of Ethylene [tex]X_{E}[/tex] = moles of Ethylene / total moles
[tex]X_{E}[/tex] = (3.1052 mol / 3.255 mol) × 100
[tex]X_{E}[/tex] = 95.397% ≈ 95.4%
we know that, mean repeat unit molar mass for a sample = ∑[tex]X_{i}[/tex][tex]M_{i}[/tex]
where [tex]X_{i}[/tex] is the fraction ratio and [tex]M_{i}[/tex] is the molecular weight
so or the PEVA
mean repeat unit molar mass M = ( [tex]X_{V}[/tex][tex]M_{V}[/tex]) + ( [tex]X_{E}[/tex][tex]M_{E}[/tex])
so we substitute
M = ( 4.6% × 86.09) + ( 95.4% × 28.05 )
M = 3.96014 + 26.7597
M = 30.72 g/mol
Therefore, The mean repeat unit molar mass for PEVA is 30.72 g/mol
b)
Degree of polymerization
[tex]DP_{n}[/tex] = [tex]\frac{M_{n} }{M}[/tex]
where [tex]M_{n}[/tex] is the number average molecular weight ( 39,870 g/mol )
so we substitute
[tex]DP_{n}[/tex] = 39,870 g/mol / 30.72 g/mol
[tex]DP_{n}[/tex] = 1297.85 ≈ 1300 { 3 significance figure }
Therefore, degree of polymerization of the copolymer is 1300
An astronomer observes an asteroid in the solar system. He notes that the asteroid is three times farther from the Sun than Earth is.
How far away from the Sun is the asteroid in astronomical units?
1 AU
2 AU
3 AU
4 AU
helpppppppp
Answer:
3 AU
Explanation:
The distance from the Earth to the Sun is known as 1 AU, or 1 Astronomical Unit. If an asteroid is three times this distance, it is 3 AU away.
explain how liquid can enter the gas phase without reaching its boiling point
Please help, and if you could also give me a step by step that would be awesome!!
Answer:
4.4 g
Explanation:
Step 1: Write the balanced equation
Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O
Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP
At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.
3.2 L × 1 mol/22.4 L = 0.14 mol
Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂
The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.
Step 4: Calculate the mass corresponding to 0.070 moles of Cu
The molar mass of Cu is 63.55 g/mol.
0.070 mol × 63.55 g/mol = 4.4 g
Which statement correctly describes a difference between aesexual and sexual reproduction?
Answer:
(3rd option) Asexually reproduced offsprings have the same amount of genetic information as the parent, while sexually reproduced offsprings have half as much genetic information.
Explanation:
This is variation is caused as a result of both gamete production and fertilisation.
What is the normal pH range of a Base?
Answer:
7.35 - 7.45
Explanation:
The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually, the body maintains the pH of blood close to 7.40.
Hope this helps
Answer:
The normal pH range if a base is more than 7
Explanation:
Basideally the pH range goes from 0-14 in which
Acidic range is :0-7
Neutral :7
Base : 7 - 14
Which of the following best describe gas particles?
SELECT ALL THAT APPLY
A.) moving randomly
B.) collide with each other
C.) move slow
D.) High kinetic energy
E.) moving orderly
Answer:
A, B and D
Explanation:
Gas particles move randmly at high speed, colliding with each other
HELP!!!! Which of the following substances is a major component in acid rain?
A) KOH
B) NH3
C) SO2
D) NaOH
Answer:
(C) SO2.
SO2 is known as sulfur dioxide.
The below information about acid rain and SO2’s involvement is from epa.gov:
“Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.”
Explanation:
PLEASE HELP
How should this combustion reaction be balanced?
C5H3 + 02 → CO2 + H20
A. C5Hg + 502 → 5C02 + H20
B. C5Hg + 702 → 5C02 + 4H20
O C. C5H3 + 3.502 → 5C02 + 8H20
D. C5Hg + 302 → CO2 + 4H20
Answer:
B
Explanation:
All elements on both sides of the equation have the same amount of moles
DIRECTION: Supply the missing information about the scientist listed in the graphic
organizer.
HELP ME PLEASSEEEE
I'll give you brainliest I promise
Answer:
The missing information or their role in the discovery of the cell is as follows:
Robert Hooke: He was the first scientist to called cells to tiny box-like cavities he saw in cork and illustrated as cells.
A. Leeuwenhoek: he was a microscopist and microbiologist who used microscopes and observed many other living cells. He called animalcules to these single-cell living organisms later used to prove that cells are the fundamental unit of life.
Schwann and Schleiden: They presented the theory that suggested that the cells are basic building blocks of all living things.
Virchow: He observed that the cell dividing and come from pre-existing cells.
Is CaO binary or polyatomic?
Answer:
It is going to be binary
Explanation:
A 5.41 g sample of carbon reacts with hydrogen to form 6.32 g of an organic compound. What is the empirical formula of the organic compound?
Answer:
CH₂
Explanation:
From the question given above, the following data were obtained:
Mass of Carbon (C) = 5.41 g
Mass of compound = 6.32 g
Empirical formula =?
Next, we shall determine the mass of Hydrogen (H) in the compound. This can be obtained as follow:
Mass of Carbon (C) = 5.41 g
Mass of compound = 6.32 g
Mass of Hydrogen (H) =?
Mass of H = mass of compound – mass of C
Mass of H = 6.32 – 5.41
Mass of H = 0.91 g
Finally, we shall determine the empirical formula of the compound. This can be obtained as follow:
Mass of C = 5.41 g
Mass of H = 0.91 g
Divide by their molar mass
C = 5.41 / 12 = 0.451
H = 0.91 / 1 = 0.91
Divide by the smallest
C = 0.451 / 0.451 = 1
H = 0.91 / 0.451 = 2
Thus, the empirical formula for the compound is CH₂
write the subshell electron configuration (i.s. 1s2 2s2, ect.) for S16 atom
Answer:
1s22s22p63s23p4.Why is solubility critical when fighting a hydrocarbon fire?
Answer:
Unlike other extinguishing agents - water, dry chemical, CO2, etc., a stable aqueous foam can extinguish a flammable or combustible liquid fire by the combined mechanisms of cooling, separating the flame/ignition source from the product surface, suppressing vapors and smothering. It can also secure for extended periods of time against reflash or reignition. Water, if used on a standard hydrocarbon fuel, is heavier than most of those liquids and if applied directly to the fuel surface, will sink to the bottom having little or no effect on extinguishment or vapor suppression. If the liquid fuel heats above 212ºF, the water may boil below the fuel surface throwing the fuel out of the contained area and spreading the fire. For this reason, foam is the primary fire-extinguishing agent for all potential hazards or areas where flammable liquids are transported, processed, stored or used as an energy source.
this is what I found, hope it helps
In contrast to other extinguishing agents such as water, dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling, separating the flame source from the product surface, suppressing vapors, and smothering.
What is solubility ?The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
It can also protect against ref lash or reignition for extended periods of time. Water is heavier than most liquids when used on a standard hydrocarbon fuel and will sink to the bottom if applied directly to the fuel surface, having little or no effect on extinguishment or vapor suppression.
If the liquid fuel heats above 212°F, water may boil beneath the fuel surface, releasing the fuel and spreading the fire.
Thus, dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling.
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PLEASE HELP! Will mark Brainly if correct!
Answer:
6.591
explanation
mass of weight is 1.092 , and mass of weight boat and sample = 7.683
mass of the solid sample= (mass of weight boat and sample) - (weight of the boat) = (1.092-7683) = 6.591 g
hence, the mass of the solid sample is 6.591 g
7. Consider an element with 2
electrons on the 1st shell and 4
electrons on the 2nd shell. What
element is likely to have that Bohr
model?
Answer:
Carbon (C)
Explanation:
The electron configuration of Carbon is 2-4.
What is the number of nitrogen molecules that reacted with excess hydrogen to make 2x10^10 molecules of ammonia
According to stoichiometry and mole concept,1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important while balancing chemical equations.
In the given example, as 1 molecule of nitrogen produces 2 molecules of ammonia
∴2 x 10¹⁰ molecules of ammonia will be produced when 2 x 10¹⁰×1/2=1×10¹⁰ molecules .
Thus, 1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.
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