Answer:
b
Explanation:
A light year is a measurement of ___________.
Which word best completes the sentence?
Answer:
distance
Explanation:
(=^w^=) it is literally just the distance a beam of light moves in one year
Answer:
It is distance( they were right)
Explanation:
Took test
A gas has an initial pressure of 633 torr and an initial volume of 87.3 mL. What is its new pressure if volume is changed to 45.0 mL?
Answer:
1230 torr
Explanation:
To solve this problem, all you need to do is apply Boyle's Gas Law: P1V1 = P2V2.
633 torr x 87.3 mL = 45.0 mL x P2 (Unknown)
P2 = 1230 torr
(Remember, we need to follow sig fig rules.)
The statement of the new pressure is "1228.02"
What is a pressure?The physical force exerted on an item is known as pressure. The pressure and volume of the gas are maintained at a constant temperature according to Boyle's law, that is pressure and volume are inversely proportional.
P1.V1 = P2.V2
Now,
P1 = 633 torr and V1 = 87.3 mL
V2 = 45.0 mL
In order to find the new volume, substituting these values into Boyle’s law, we get
[tex]P2\;=\;\frac{P1.V1}{V2} \\P2\;=\;\frac{(633\; torr).(87.3\;mL)}{(45.0\;mL)} \\[/tex]
P2 = 1228.02 torr
Hence the correct answer is 1228.02 torr.
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How many moles of hydrogen atoms are there in 43g of pentathol C5H11OH
Answer:
Using your answer from Part A, calculate the volume of a mole of Na atoms (in cm3/mol ). Assume that the entire volume is occupied by Na atoms leaving no gaps or holes between adjacent atoms. (Answer A is V= 2.70*10^7)
Given the following set of data from the decomposition of hydrogen peroxide,
how is the initial rate of the reaction (between time 0 and 300 seconds)
different from the rate of the reaction between 1800 and 3000 seconds?
[H202 M
Time (s)
2.0
0
1.6
300
1.4
600
1.1
1200
0.72
1800
0.15
3000
Answer:
what it mean I don't know
An inventor claims to have developed a new perfume that lasts a long time because it doesn't evaporate. Comment on this claim.
a. This would be impossible to make because the perfume would have to be pressurized in order to not evaporate.
b. This product is sure sweep the market making many happy customers.
c. In order to smell something, the molecules must evaporate and reach your nose. If the new perfume doesn't evaporate, it will not have an odor.
d. A perfume that does not evaporate could be toxic since the molecules never leave the skin.
Answer:
C
Explanation:
Perfume needs to evaporate in order to smell. If this perfume didn't evaporate, it would stay as a liquid and never smell.
It wouldn't be D, as no toxic perfumes is sold.
It's not A because perfume doesn't have to be pressurized in order to not evaporate.
It's not B, as it is a hasty conclusion to the claim. Plus, if the perfume did have an odor, even while not evaporating, the sales would be low as the product is that good.
Which plant part makes most of the food?
A. Roots
B. Fruit
C. Flower
D. Leaf
wally fluoride is an imaginary gaseous
compound with a molar mass of 314.2 g/mol.
(a) What is the density of wollmanium fluoride at 425 K
and 165 torr?
Answer:
[tex]\rho =1.96\frac{g}{L}[/tex]
Explanation:
Hello there!
In this case, since this imaginary gas can be modelled as an ideal gas, we can write:
[tex]PV=nRT[/tex]
Which can be written in terms of density and molar mass as shown below:
[tex]\frac{P}{RT} =\frac{n}{V} \\\\\frac{P}{RT} =\frac{m}{MM*V}\\\\\frac{P*MM}{RT} =\frac{m}{V}=\rho[/tex]
Thus, by computing the pressure in atmospheres, the resulting density would be:
[tex]\rho = \frac{165/760 atm * 314.2 g/mol}{0.08206\frac{atm*L}{mol*K}*425K} \\\\\rho =1.96\frac{g}{L}[/tex]
Best regards!
Be sure to answer all parts. Given that syn addition of H2 occurs from both sides of a trigonal planar double bond, draw all stereoisomers formed when the compound is treated with H2. draw structure ... trans isomer draw structure ... cis isomer
Answer:
Following are the responses to the given question:
Explanation:
Please find the attached file for the solution.
Aeronautical engineers have to consider the weight, trust, life, and drag of an airplane to determine whether or not…
Answer:
the plane will crash, or if it is usable or not.
2.56 x 10^13 molecules of HgO equates to how many moles of HgO?
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{2.56 \times {10}^{13} }{6.02 \times {10}^{23} } \\ \\ \\ = 4.25 \times {10}^{ - 11} \: \: \: moles[/tex]
Hope this helps you
What is meant by X-ray
Answer:
An X-ray, or X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 124 eV to 124 keV.
Explanation:
An X-ray, or X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (30×1015 Hz to 30×1018 Hz) and energies in the range 124 eV to 124 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it on November 8, 1895. He named it X-radiation to signify an unknown type of radiation. Spellings of X-ray(s) in English include the variants x-ray(s), xray(s), and X ray(s).
Directions: Select the correct planet.
The diagram below shows the orbits of the inner planets around the Sun Based on the diagram, which inner planetas the longest
year?
Nenus
Mercury
Mars
Earth
Sun and planets
not drawn to scale
Answer:
Mars
Explanation:
It's the furthest away from the sun so it has the longest orbit
Answer:
the anser is mars
Explanation:
How many protons and neutrons are in an atom of Cf-251 ?
Answer:
the protons are 98
and the neutrons are 153
you're welcome
but next time try to study harder.
Calculate the percent mass of hydrogen in ethane (C2H6).
Answer:
80.% carbon and 20.% hydrogen
Explanation:
Ethane has molecular formula C2H6. So What is the composition of carbon and hydrogen in ethane. its alot to explain but yea thats wht i got
Determine the number of moles in 258.45 grams of iron (III) chloride (FeCl3). Show and explain all
your work for full credit. Make sure you show all units.
Answer:
[tex]\boxed {\boxed {\sf 1.5935 \ mol \ FeCl_}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass. This can be found on the Periodic Table. First, find the molar mass of iron and chlorine.
Fe: 55.84 g/mol Cl: 35.45 g/molCheck the formula. There is a subscript of 3 after Cl, so there are 3 atoms of chlorine in 1 molecule. Multiply iron's molar mass by 3, then add iron's molar mass.
FeCl₃: 55.84 + 3(35.45) = 55.84+106.35=162.19 g/molUse this number as a ratio.
[tex]\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Multiply by the given number of grams.
[tex]258.45 \ g \ FeCl_3 *\frac {162.19 \ g\ FeCl_3}{1 \ mol \ FeCl_3}[/tex]
Flip the ratio so the grams of iron (III) chloride cancel.
[tex]258.45 \ g \ FeCl_3 *\frac {1 \ mol \ FeCl_3}{162.19 \ g\ FeCl_3}[/tex]
[tex]258.45 *\frac {1 \ mol \ FeCl_3}{162.19}[/tex]
[tex]\frac {258.45 \ mol \ FeCl_3}{162.19}[/tex]
[tex]1.59350144892 \ mol \ FeCl_3[/tex]
The original measurement of grams has 5 significant figures, so our answer must have the same. For the number we calculated, that is the ten thousandth place.
[tex]1.5935 \ mol \ FeCl_3[/tex]
258.45 grams is approximately 1.5935 moles of iron (III) chloride.
Given this slope equation, calculate the x-intercept (the point at which y = 0).
y = 0.523x + 16.8
Answer:
The answer is (-31.58, 0) when rounded to 2 decimal places.
If 45 grams of solid aluminum and 301 grams of ammonium perchlorate are reacted. How much excess reactant is left over? Show your work using equation editor.
Answer: Your balanced equation is 2Al + 3S --> Al_2S_3. In two separate equations, first use the 48.5g of Al to find the amount (in moles) of Al_2S_3. Then use the 62.8g of S to find the amount (in moles) of Al_2S_3. By doing these, you find which reactant (the Al or the S) produces the least amount of Al_2S_3. Since it's the S, that's the limiting reactant: you then use that 62.8g of S to find how many grams of Al will be used in the reaction. (Use the same balanced equation.) You find that 35.2g of Al will be used, then find the excess by subtracting that 35.19 from the original 48.5g. Your excess amount is 13.3g of Al!
Explanation:
hopefully this is what you were looking for <3 :)
The amount of excess reactant that left over the chemical reaction between aluminum and ammonium perchlorate is 0.9 moles.
How do we convert mass into moles?Mass into moles (n) will be converted by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 45g of Aluminum = 45g / 27g/mol = 1.66 mol
Moles of 301g of ammonium perchlorate = 301g / 117.4g/mol = 2.56 mol
Both reactants are reacted with each other and one of the reactant is fully consumed, so the excess reactant will be calculated as:
Excess reactant = 2.56mol - 1.66mol = 0.9 moles
Hence amount of excess reactant is 0.9 moles.
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the maximum amount of copper sulfate that can be dissolved in 45.0g of water at 70C is 20.0g. what is the solubility of copper sulfate at that temperature?
(in grams per 100g water)
Answer:
That depends on the amount. Solubility is the maximum amount of salt dissolved in 100 g of water. So, if the amount is within limit, then yes. Solubility of anhydrous copper sulfate is 24.3 g/100 g water, so it is not bad. Put it in perspective, the solubility of NaCl is about 35 g/100 g water at room temperature. If the amount of copper sulfate is unknown, qualitative I'd say solid copper sulfate will dissolve in water completely.
Explanation:
If you use the pentahydrate CuSO4.5H2O then the solubility at 20°C is 20.8g/100ml H2O
If you use the anhydride, CuSO4. then the solubility at 20°C is 36.2g/100ml H2O
A small file or organization use a payroll program for calculating staff wages each month each employee has a unique payroll number had is paid a fixed hourly rate which may be different for different employee. the system uses a master file containing long term details such as name Address, hourly,rate of pay and total pay for a year .the key field in the master file is the payroll number and the filled is stored in this field .each month by each a transaction file is produced containing details of the hours worked during that month by each employee,(a)state the type of processing used in this application and explain why this type of processing is suctable,(b) describe the processing take place each month when the payroll program is run staff with unsorted transaction file and end after the master file has been updated the pay slips have been printed,(c) explain what would happen during the processing of an employee payroll number had been entered incorrectly into the transaction file
Answer:
the company is now aarav and its CEO of samruddhi and is the CEO in meeting with holika and will come in to help with holika as brainlyiest as the company's chief financial adviser to solve di problems
Explanation:
it was the most common thing that happened in my first pregnancy in my first year and I m and the other girl Bo.. were pretty good vibes for the last day of samruddhi but they are still very much a many years after I was knowing that
Give the systematic (IUPAC) name for each molecule. This molecule has the condensed formula C H 3 C O C H 3. The oxygen atom has a double bond to the center carbon. systematic (IUPAC) name: This molecule has the condensed formula C H 3 C H 2 C H 2 C O C H 3. The oxygen atom has a double bond to carbon. systematic (IUPAC) name:
Answer: The IUPAC name of [tex]CH_3COCH_3[/tex] propan-2-one and [tex]CH_3CH_2CH_2COCH_3[/tex] is pentan-2-one.
Explanation:
The basic rules for naming of organic compounds are :
1. First select the longest possible carbon chain. The longest possible carbon chain should include the carbons of double or triple bonds or functional group.For the number of carbon atom, we add prefix as 'meth' for 1, 'eth' for 2, 'prop' for 3, 'but' for 4, 'pent' for 5, 'hex' for 6, 'sept' for 7, 'oct' for 8, 'nona' for 9 and 'deca' for 10.
2. The naming of alkane is done by adding the suffix -ane, alkene by adding the suffix -ene, alkyne by adding the suffix -yne and ketones by adding the suffix -one.;
3. The numbering is done in such a way that the carbon containing the functional group gets the lowest number. While writing the name, the word root is given first , followed by the position of carbon containing the functional group followed by the suffix.
The IUPAC name of [tex]CH_3COCH_3[/tex] propan-2-one and [tex]CH_3CH_2CH_2COCH_3[/tex] is pentan-2-one.
Arrange the following molecules in order of increasing bond polarity (highest bond polarity at the bottom):
a. NF3
b. NCl3
c. Nbr3
d. CF4
please help ill give brainly !!
when air is heated what happens to its density?
A ) It is increased because the molecules are moving together.
B ) It is increased because the molecules are moving apart.
C ) It is decreased because the molecules are moving together.
D ) It is decreased because the molecules are moving apart
Answer:
B.
Explanation:
The molecules are moving apart meaning that they move faster when heated and move slower when cooled
Look at the diagram of a fuel cell below.
Which part of the fuel cell does A represent?
A. air
B. anode
C. cathode
D. electrolyte
Answer:
It is a electrolyte.
Explanation:
I took the test.
It represents an electrolyte.
What happens if electrolytes are low in the body?
A level under three can cause muscle weakness, spasms, cramps, paralysis, and respiratory problems. If it continues, kidney problems may occur.
What do electrolytes do for your body?Electrolytes are substances that have a natural positive or negative electrical charge when dissolved in water. They help your body regulate chemical reactions, maintain the balance between fluids inside and outside your cells, and more.
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Which of the following is an example of a process that absorbs energy?
gas converting to a liquid
solid coverting to a liquid
a substance freezing
temperature of a substance decreasing
Answer:
-Gas converting to a liquid
-Solid converting to a liquid
Explanation:
Endothermic process. It's absorb heat
What is the type of the synthesis reaction between Chromium + oxygen???
Answer:
Explanation: Reaction of oxygen with chromium(II) and chromium(III) porphyrins and synthesis of a .mu.-oxo chromium porphyrin derivative.
tion:
How is heat involved in chemical reactions and processes
Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic.
(Have a good day!)
Answer:
Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and it called exothermic.
Which option identifies all the bonds broken during this chemical reaction?
2H2 +O2 --> 2H2O
A. The bonds between the two hydrogen atoms and between the two oxygen atoms
B. The bonds between the two oxygen atoms
C. The bonds between oxygen and hydrogen atoms
D. The bonds between the two hydrogen atoms
Answer:
the bond b/w oxygen and hydrogen atom
Answer: A, the bonds between the two hydrogen atoms and between the two oxygen atoms.
List the three different temperature scales
Answer:
Celcius
Farenheit
Kelvin
Explanation:
How do separate the pure ethanol from the mixture of coloured aqueous solution with ethanol
Answer:
Fractional distillation is a method for separating a liquid from a mixture of two or more liquids. For example, liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.
Molecules on the surface of the ice escaping into the water happen in ————.
A. Boiling
B. Freezing
C. Condensation
D. Melting
E. Sublimation