The _______ force between each planet and the Sun keeps the planets in orbit around the Sun.
Answer:
The Force of Gravity force between each planet and the Sun keeps the planets in orbit around the Sun.
Explanation:
Is the earth older than any of they rock layers
Answer:
no the rock was formed before the layers that we life on today
Explanation:
How much heat is required to vaporize 166g of water at it's boiling point, if water's heat of vaporization is equal to 40.7kJ/mol?
___________________________kJ
Answer:
375.3KJ
Explanation:
The following data were obtained from the question:
Mass of water = 166g
Heat of Vaporisation (ΔHv) = 40.7kJ/mol
Heat (Q) =..?
Next, we shall determine the number of mole in 166g of water. This is illustrated below:
Mass of H2O = 166g
Molar mass of H2O = (2x1) + 16 = 18g/mol
Number of mole = Mass/Molar Mass
Number of mole of H2O = 166/18
Number of mole of H2O = 9.22 moles.
Now, we can obtain the heat required to vaporise the water as shown below:
Q = n·ΔHv
Q = 9.22 mol x 40.7kJ/mol
Q = 375.3KJ
Therefore, the heat required to vaporise the water is 375.3KJ.
Name the following Compounds
Alkane C-C
Answer:
Alkanes
Explanation:
Compounds with a saturated hydrocarbon chain i.e having only single bonds between the atoms and is composed entirely of carbon and hydrogen is called as alkane.
The general formula of alkane is CnH2n+2.
Alkanes have no double or triple bonds and hence they have maximum number of carbon to hydrogen covalent bonds. While in case of alkenes there exists double bond and in case of alkynes exists triple bonds
Complete the sentences to describe the structure of DNA.
The shape of the DNA molecule is called a double
The backbone of DNA is made of
molecules and phosphate molecules
The "rungs" of DNA are made of
Answer:
helix
sugar-phosphate
four nitrogen bases that are adenine, thymine, guanine, cytosine
The shape of the DNA molecule is called a double helix. The backbone of DNA is made of sugar-phosphate molecules and phosphate molecules.
What is DNA?Deoxyribonucleic acid, or DNA, is an organic molecule with a complicated molecular architecture that is present in all prokaryotic or eukaryotic cells, as well as in a variety of viruses. For the transfer of inherited traits, DNA codes genetic information. Despite the fact that the molecule DNA was initially identified in 1869, its significance for inherited characteristics was not shown until 1943.
James Watson and Francis Crick discovered that the structure of DNA consists of a double-helix polymer, a spiral made up of two DNA strands twisted around each other. The shape of the DNA molecule is called a double helix. The backbone of DNA is made of sugar-phosphate molecules and phosphate molecules. The "rungs" of DNA are made of four nitrogen bases that are adenine, thymine, guanine, cytosine.
Therefore, the shape of the DNA molecule is called a double helix. The backbone of DNA is made of sugar-phosphate molecules and phosphate molecules.
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why natural fas is not used as a bottled gas or as a motor fuel?
Answer:
Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4). It accounts for about 30% of the energy used in the United States. About 40% of the fuel goes to electric power production and the remaining is split between residential and commercial uses, such as heating and cooking, and industrial uses. Although natural gas is a proven, reliable alternative fuel that has long been used to power natural gas vehicles, only about two-tenths of 1% is used for transportation fuel.
The vast majority of natural gas in the United States is considered a fossil fuel because it is made from sources formed over millions of years by the action of heat and pressure on organic materials. Alternatively, renewable natural gas (RNG), also known as biomethane, is a pipeline-quality vehicle fuel produced from organic materials—such as waste from landfills and livestock—through anaerobic digestion. RNG qualifies as an advanced biofuel under the Renewable Fuel Standard.
Because RNG is chemically identical to fossil-derived conventional natural gas, it can use the existing natural gas distribution system and must be compressed or liquefied for use in vehicles.
CNG and LNG as Alternative Transportation Fuels
Two forms of natural gas are currently used in vehicles: compressed natural gas (CNG) and liquefied natural gas (LNG). Both are domestically produced, relatively low priced, and commercially available. Considered alternative fuels under the Energy Policy Act of 1992, CNG and LNG are sold in units of gasoline or diesel gallon equivalents (GGEs or DGEs) based on the energy content of a gallon of gasoline or diesel fuel.
Compressed Natural Gas
CNG is produced by compressing natural gas to less than 1% of its volume at standard atmospheric pressure. To provide adequate driving range, CNG is stored onboard a vehicle in a compressed gaseous state at a pressure of up to 3,600 pounds per square inch.
CNG is used in light-, medium-, and heavy-duty applications. A CNG-powered vehicle gets about the same fuel economy as a conventional gasoline vehicle on a GGE basis. One GGE equals about 5.66 pounds of CNG.
Liquefied Natural Gas
LNG is natural gas in its liquid form. LNG is produced by purifying natural gas and super-cooling it to -260°F to turn it into a liquid. During the process known as liquefaction, natural gas is cooled below its boiling point, removing most of the extraneous compounds found in the fuel. The remaining natural gas is primarily methane with small amounts of other hydrocarbons.
Because of LNG's relatively high production cost, as well as the need to store it in expensive cryogenic tanks, the fuel's widespread use in commercial applications has been limited. LNG must be kept at cold temperatures and is stored in double-walled, vacuum-insulated pressure vessels. LNG is suitable for trucks that require longer ranges because liquid is denser than gas and, therefore, more energy can be stored by volume. LNG is typically used in medium- and heavy-duty vehicles. One GGE equals about 1.5 gallons of LNG.
Which of the following objects has the greatest kinetic energy
Which level of ecological organization includes both biotic and abiotic factors
The answer is Ecosystem
Answer:
ecosystem
Explanation:
i took it on edge 2021 and got 100
The box is at rest on the table.what force is represented by A?
Answer: There is no force if it is at rest
Explanation:
can u answer this?
Mass: 386 g
Volume: 20 cm to the third power
Density: ?
Answer:
Calculate density
Weight/mass
386
g
Volume
20
cm³
Density
19,300
kg/m³
Explanation:
which acids caused the effects seen on the teeth in the study
Answer:
Hcl
Explanation:Idfk :))Bună ziua. La pagina 169 aveți o altă piesă de teatru. Vă rog să o citiți și să răspundeți la întrebările 1,2,4,7,8/ pag. 170.
Sper că vă scrieți toate lecțiile în caiet! Sunt copii care încă nu mi-au trimis nicio temă. Vă rog să vă mobilizați! Când ne întâlnim vă verific caietele. Mult spor!
phosphoric and citric acids
Answer:
Explanation:
Tricky please help !!!!!!!!
describe the law of conservation of momentum
Which function allows a user to add another item to a list in Python? order() print() sort() append()
Answer:
append()
Explanation:
just took this test, chose this answer, and got it correct
Answer:
d
Explanation:
I guess it is a small world cuz i doing the test on flvs to
hope this helps
If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?
Answer:
Yellow
Explanation:
Thymol blue has a brownish-green or reddish-brown color and is a good pH indicator. It changes from red to yellow at a pH 1.2–2.8 ( acidic) and then from yellow to blue at a pH of 8.0–9.6( alkaline).
Nitric acid is a strong acid which means the pH indicator will change to yellow.
What is the pH of a 3.50 x 10^-3 M NaOH solution
Answer:
11.54
Explanation:
-log(3.50*10^-3) = 2.46 pOH
pH = 14 - pOH
pH = 11.54
Why do we experience the changing of the seasons on earth
Answer:
Earth's axis and position around the sun.
Explanation:
Earth's tilted axis causes the seasons to change. Throughout the year, different parts of Earth acquire the Sun's most direct rays(Or heat) because of the orbital rotation of Earth. So, when the North Pole tilts toward the Sun, it's summer inside the Northern Hemisphere. And whilst the South Pole tilts towards the Sun, it is winter within the Northern Hemisphere and vise versa.
We experience the changing of the seasons on earth due to earth's changing relationship of the sun.
What causes seasons on earth?
Seasons happen because Earth's axis is tilted at an angle of about 23.4 degrees. And different parts of Earth receive more solar energy than others.Because of Earth's axial tilt (obliquity), our planet orbits the Sun on a slant which means different areas of Earth point toward or away from the Sun at different times of the year.
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What determines how fast a substance will dissolve
Answer:
(1) the surface area of the solute,
(2) the temperature of the solvent,
(3) the amount of agitation that occurs when the solute and the solvent are mixed.
Explanation:
Given the reaction:
NH3(g) + H2O() NH4+(aq) + OH–(aq)
Which is the conjugate acid-base pair?
A) H2O() and NH4+(aq)
B) H2O() and NH3(g)
C) NH3(g) and OH–(aq)
D) NH3(g) and NH4+(aq)
5.2 g of HCl are dissolved in 25 mL of solution. What is the molarity?
Answer:
The molarity is 5.7 moles per dm^3
Explanation:
Molarity is calculated in units of moles per dm^3 or simply moles per liter.
What this means is that to get the molarity, we simply find the number of moles and divide by the volume.
Since we are given the mass, we need to find the number of moles first.
Mathematically, the number of moles = mass/molar mass
The molar mass of HCl is 1 + 35.5 = 36.5 g/mol
The number of moles contained in 5.2g of HCl = 5.2/36.5 = 0.1425 moles
Now, we also need to convert the the volume to liters too.
1000 ml = 1L
25ml = xL
x * 1000 = 25
x = 25/1000 = 0.025 L
the molarity is thus 0.1425/0.025 = 5.7 mol/dm^3
1.
PART A: In paragraph 2, what does the phrase "miners of all shapes and sizes" mean? [R14]
A Many people were invited.
B. People with supplies traveled to the Yukon.
C. People experienced discrimination.
D. Many types of people traveled to the Yukon.
Answer:
A.
Explanation:
Miners were happy due to the result of the gold rush. they labored very hard for very little profit. Working in the Yukon Territory was not safe. To reach it, the ground had to be dug. Then the dirt had to be removed to get the gold.
In paragraph 2, what does the phrase "miners of all shapes and sizes" mean that many people were invited. This included food, clothing, transportation equipment, etc.
Which planet in the solar system is least dense
Answer:
Saturn
Explanation:
Answer:
Saturn
Explanation:
Give the formula for the alkane containing 500 carbons.
Answer:
1002
Explanation:
[tex]C_{2n}[/tex][tex]H_{2n+2}[/tex]
500 multiply by 2 add 2
The chemical formula of an alkane with 500 carbons is C₅₀₀H₁₀₀₂ as the general formula of alkanes is C[tex]_n[/tex]H[tex]_2n[/tex][tex]_+2[/tex].
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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please help ASAP
17.8 mL of HNO3 is neutralized in a titration by 24.7 mL of a 0.299 M Sr(OH)2 solution. Calculate the pH of the unknown acid.
Answer:
0.1
Explanation:
We must first put down the equation of the reaction in order to guide our solution of the question.
2HNO3(aq) + Sr(OH)2(aq) -------> Sr(NO3)2(aq) + 2H2O(l)
Now from the question, the following were given;
Concentration of acid CA= ??????
Concentration of base CB= 0.299M
Volume of acid VA= 17.8ml
Volume of base VB= 24.7ml
Number of moles of acid NA= 2
Number of moles of base NB= 1
From;
CAVA/CBVB= NA/NB
CAVANB= CBVBNA
CA= CBVBNA/VANB
SUBSTITUTING VALUES;
CA= 0.299 × 24.7 ×2 / 17.8×1
CA= 0.8298 M
But;
pH= -log[H^+]
[H^+] = 0.8298 M
pH= -log[0.8298 M]
pH= 0.1
A woolly mammoth was found in 1999 buried in the frozen soil of the Siberian tundra. Carbon-14 dating indicated that it had died about 20,000 years ago. Many fossils represent only the partial remains of organisms. However, a complete mammoth with bones, skin, hair, and internal organs intact represented a unique opportunity for scientists to investigate the lifestyle of this animal and the environment in which it lived. The low permeability of the tundra soil helped to preserve the mammoth. Explain why the tundra soil has a low permeability.
Tundra soils are formed at high latitudes which leaves the tundra always very cold. Tundra soils are generally frozen, and are classifed as Gelisols (this means that permafrost are within 100 cm of the soil surface). These permafrost are as a result of the freezing by winter of the underground water that was accumulated in summer. These soils freeze and thaw alot and as result of that, moisture do not permeate the soil easily. Also, due to this harsh temperature and underground permafrost, most organisms that died in the tundra are preserved within the soil.
what do you mean by elementary and their classification
Answer:
The Classification of elementary students and the basis of their state of mind determines how they are and how they react to specific things.
Explanation:
The classification of that specific person depends on their qualifications
What happens to the chemical structure of water when it changes states
Answer:
When water changes to a solid or gas, it's said that water changes to a different state of matter
Explanation:
Even when water physical form changes, the molecules stay the same. Water's molecules contains two hydrogen atoms that is bonded with one oxygen atom.
Which material can best be used to cast a footwear or tire impression?
A.) wax
B.) cement
C.) sulfur
D.) putty
Answer:
B.) cement
Explanation:
The commonest types of impression evidence found in crime scenes include footprints, tire tracks, bite marks and tool marks etc.These types of impression evidence can be used by crime scene investigators to link the suspects to the crime.
The impressions are usually cast using gypsum cement and other forms of casting tools to preserve the evidence and make it useful during any period in the course of the investigation.
Which of the following is a product found in the chemical equation below?
Answer: [tex]2H_2O[/tex] is a product found in the chemical equation
Explanation:
The given balanced chemical equation is as follows:
[tex]CH_3SH+4O_2\rightarrow CO_2+SO_2+2H_2O[/tex]
A chemical reaction is represented by writing the chemical formula of the reactants on the left side of the arrow and the products on the right side of the arrow.
Here 1 mole of [tex]CH_3SH[/tex] and 4 moles of [tex]O_2[/tex] are the reactants and 1 mole of [tex]CO_2[/tex] , 1 mole of [tex]SO_2[/tex] and 2 moles of [tex]H_2O[/tex] are the products.
Thus from the given options, [tex]2H_2O[/tex] are products
What is the ion in acids that determines if they are safe to eat?
I need an answer but I can´t give anything because i don´t know how
Answer:
Hydrogen ion.
Explanation:
Hydrogen ion is present in the acids which indicates if they are safe for eating or not. The weak acid is present in citrus so it is safe to eat. Weak acid means the concentration of hydrogen ion is lower. If this concentration exceeds so the food is not safe to eat or drink. The pH of acid more than 5 is good to eat but below 5 can adversely affect our body if we consume it.