Answer:
.96875 moles
Explanation:
22.4 liters per mole at STP for a gas
21.7 / 22.4 = .96875 moles
Which statements describe how heat flows in foil? Check all that apply. Heat flows in all directions. Heat flows from left to right only. The atoms on top of the foil absorb heat first. The atoms near the candle absorb heat first. Heat flows from the cooler atoms to the warmer atoms. Heat flows from the warmer atoms to the cooler atoms.
Answer:
A D F
Explanation:
Its right but its not in order But its A D and F
Answer:
answer in picture
Explanation:
What are requirements before you can compare the energy (or enthalpy or Gibbs free energy) for 2 compounds
The main two requirements to compare the energy for 2 compounds are the balanced chemical formula and the temperature of the compounds.
How do we calculate the free energy change?Gibb's free energy change of any reaction will be calculated by using the below equation as:
ΔG = ΔH - TΔS, where
ΔH = change in enthalpy
T = temperature
ΔS = change in entropy
Before calculating the free energy of any reaction you should first balance the given chemical reaction to check the involved moles of substance and also the value of temperature before & after the completion of reaction to check the nature of the reaction.
Hence balancing the equation and checking the temperature are the two requirements.
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The light traveled from _____________________ to __________________. (What transparent materials?)
Explanation:
High density medium to low density medium.
What properties are used to arrange the
elements in the periodic table.
Answer:
Elements are arranged from left to right and top to bottom in order of increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.
Answer:
See below ~
Explanation:
Properties used to arrange elements
Atomic numberValencyNumber of shellsMelting PointElectronic Configurationetc.What are you doing when you figure out whether a claim is true or not?
O A. Finding
O B. Complicating
C. Evaluating
O D. Claiming
Answer:
Either A. or C. Evaluating, but most likely C.
Explanation:
The reason it is C is because to find out wheather something is true or not, you are not claiming otherwise nor complicating, you are finding, but evaluating sounds better.
A 16.1 mL sample of an HCl solution is found to contain 3.0 x 10-3 mol HCl. What is the molarity of this solution
Taking into account the definition of molarity, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates 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 solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of the solution in this caseIn this case, you know:
number of moles= 3×10⁻³ molesvolume= 16.1 mL= 0.0161 LReplacing in the definition of molarity:
[tex]Molarity=\frac{3x10^{-3} moles}{0.0161 L}[/tex]
Solving:
molarity= 0.186[tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 0.186[tex]\frac{moles}{liter}[/tex].
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When referring to immunity, what does the term innate imply?
the mechanism will provide defense against many different types of pathogens
the mechanism will develop based upon exposure to specific pathogens
the mechanism will be built-in and present at birth
the mechanism will be acquired over an individual's lifetime
Answer:
vVv
Explanation:
innate means "inborn or natural", meaning they were born with it. if somewhat is born with an inate immunity, it means it was passed through genetics aka heredity
What are the main differences between the carbon flows 300 years ago and today?
The rate and quantity of carbon flow today has increased exponentially compared to 300 years ago.
What is carbon flow?Carbon flow refers to the process by which carbon flows through the earth.
Carbon flow can also be referred to as the carbon cycle.
Due to industrialization and the burning of fossil fuels, the rate of carbon flow has increased exponentially.
Therefore, compared to 300 years ago, the rate and quantity of carbon flow has increased.
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Explain how antacid works.
An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium.
Antacids help to treat heartburn (indigestion). They work by neutralizing the stomach acid that causes heartburn. You can buy many antacids without a prescription. Liquid forms work faster, but you may like tablets because they are easy to use.
How do atoms move in a space craft differently in a united states spacecraft vs soviet union. “WILL MARK BRAINLIEST”!!
Answer:
United States
Molecules themselves can move in any direction, they can rotate, and they can vibrate as the atoms within a molecule move back and forth relative to each-other, as if the chemical bonds connecting them were springs. Answer 5: They bounce around and wiggle and jiggle around.
Soviet Union
In terms of actually transporting this east, any and every means was used. Rail was obviously key - the evacuation alone used some 1.5 million rail cars in 1941 - but trucks were also used. Korolev planned to move forward with the Soyuz craft and N-1 heavy booster that would be the basis of a permanent crewed space station and crewed exploration
I’m so sorry if it’s wrong I tried my best
Which material is an insulator against electric current?
copper wire
a rubber tire
a silver necklace
a light bulb filament
Answer:
b) a rubber tire
Explanation:
Answer: B - a rubber tire
Explanation: Rubber is an insulator
Some volatile organic compounds can be detected by hydrogeologists in the field or labs because of the ______ emitted from the groundwater and/or soil samples. Multiple choice question.
Volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
What are volatile substances?Volatile substances are substances which can easily vaporize or change to gaseous state.
Volatile substances can either be solids or liquids but are mostly liquids.
Example of volatile substances include ether, petrol, chocolate.
The presence of volatile substances can be detected by the gases they release which may have characteristic odors.
Therefore, volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
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I need some help pls with science
Answer:
the answer to number 9 is A.
Explanation:
If 4. 0 moles of propane are mixed with 15. 0 moles of oxygen o 2, how many moles of water h 2o will be formed?.
12 moles of water are produced when 4.0 moles of propane are mixed with 15.0 moles of oxygen,
What is a combustion reaction?A combustion reaction is one in which a substance reacts with oxygen releasing heat and light energy.
People burns in oxygen to produce carbon (iv) oxide and water according to the equation below:
[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]
1 mole of propane reacts with 5 moles of oxygen to produce 4 moles of water.
15 moles of oxygen will react with 3 moles of propane to produce 12 moles of water.
Therefore, If 4.0 moles of propane are mixed with 15.0 moles of oxygen, 12 moles of water are produced
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Solve the following problems and write your answer in the space provided.
2. What is the molarity of a hydrochloric acid solution that has a volume of 1500
mL and contains 441 g of HCI?
Taking into account the definition of molarity, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates 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 solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity of a hydrochloric acid solutionIn this case, you know:
number of moles= 441 g× [tex]\frac{1mole}{36.45 g}[/tex]= 12.099 moles (being 36.46 [tex]\frac{g}{mole}[/tex] the molar mass of NaNO₃, this is,the amount of mass that a substance contains in one mole.)volume= 1500 mL= 1.5 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{12.099 moles}{1.5 L}[/tex]
Solving:
molarity= 8.066[tex]\frac{moles}{liter}[/tex]
Finally, the molarity of the solution is 8.066 [tex]\frac{moles}{liter}[/tex].
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What is the value of n in ch3(ch2)nch3 if the name of the hydrocarbon is heptane? 2 5 7 8
The values of n in CH₃(CH₂)ₙCH₃ if the name of the hydrocarbon is heptane is equal to 5.
What are hydrocarbons?Hydrocarbonds are the compounds which are formed by the composition of hydrogen and carbon atoms.
In the question wanted hydrocarbon is heptane, in which 'hept' means 7 and 'ane' means alkane. Given formula of hydrocarbon is CH₃(CH₂)ₙCH₃ in which already 2 carbons of CH₃ group is present and to complete 7 carbons, the number of n should be 5.
So the required value of n is 5.
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What is the source of the energy that causes electrons to be emitted from the surface?.
Answer:
sunlight
Explanation:
it is the sunlight
If chloride is a ligand to a transition metal it will not be precipitated by silver nitrate. True False
Answer:True
Explanation:
If the chloride ligand is coordinated with the transition metal and present inside the coordination sphere then it will not precipitate by silver nitrate.
What are ligands?A ligand can be described as an ion or molecule, which donates a pair of electrons to the central metal ion to form a coordination complex. Ligands can be anionic, cationic, or neutral molecules. Ligands act as Lewis bases because they can donate electron pairs and metal atoms as Lewis acids as they act as electron pair acceptors.
The bonding between transition metal to ligand varies from the covalent bond to the ionic bond. Ligands can be cations (NO⁺) and electron-pair acceptors and anionic ligands are F⁻, Cl⁻, Br⁻, I⁻, CN⁻, OH⁻, NH₂⁻ , and neutral ligands are NH₃, H₂O, NO, and CO.
A ligand binds to the central transition metal to form a coordination complex compound. The ligand that is bonded to metal cannot be precipitated.
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Explain why Argon is so unreactive
Answer:Argon is unreactive because it has the maximum number of electrons in its outer shell. Noble gases are unreactive because they have the full complement of electrons in their outermost energy levels.
Explanation:
Answer:
Argon is element 18 on the periodic table, which means that it has 18 proton in it's nucleus. Argon is in group 8 or 18 depending on your periodic table. Argon is a gas at standard temperature and pressure with a density of 1.784g/l
what factors are included in the Beer's Law expression that determines how much light passes through a liquid solution
Answer:
here.
Explanation:
molar absorptivity, path length of cuvette, test tube, and concentration.
Which 1.0 liter sample of HCl (aq) contains the least number of moles of solute particles?
Your answer:
0.010 M
0.10 M
1.0 M
10.0 M
Least no of moles means it should be 1mol
Volume in Litre=1LHence
Molarity=Moles/VolumeMolarity=1/1=1MMatch the states of matter to their properties. Drag the items on the left to the correct location on the right.
solids
liquids
gases
indefinite shape, but definite volume
indefinite shape and indefinite volume
definite shape and definite volume
lowest density
particles glide past each other
highest density
solids Highest density definite shape and colour
liquids Indefinite shape and defining volumes particles glide past each other
Gases Indefinite shape Indefinite volume lowest density
Explanation:
this is due to the nature of its molecules
The more gas molecules that are given volume of air, the greater the _____ of the air will be.
An ion has 28 protons, 24 electrons, and 30 neutrons. What is its ionic
charge?
A sample of helium had a volume of 3.20x102 mL at STP. What will be it’s new volume of the temperature is increased to 425.0k and it pressure is increased to 3.50 atm?
The new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.
Combined gas law
Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
Initial volume of helium gas V₁ = 3.20 × 10²mL = 0.32LAt standard remperature and pressure
Initial pressure P₁ = 1.0atmInitial temperature T₁ = 273.15KFinal pressure P₂ = 3.50atmFinal temperature T₂ = 425.0KFinal volume V₂ = ?To calculate the new volume of the helium gas, we subtsitute our given values into the expression above.
P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
V₂ = P₁V₁T₂ / P₂T₁
V₂ = ( 1.0atm × 0.32L × 425.0K ) / ( 3.50atm × 273.15K )
V₂ = 136LatmK / 956.025atmK
V₂ = 0.14L
V₂ = 1.40×10²mL
Therefore, the new volume of the sample of helium gas as its temperature and pressure increases to the given values is 1.40×10²mL.
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What volume will 50. 0 g of nitrogen gas occupy at STP?
Answer:
39.98 liters
Explanation:
hope this helps
Which of the following is not a reason childhood friendships are important to development? a. positive relationships provide positive psychological support. b. friends are a child's first chance in learning how to be social with siblings. c. adolescents can use friendships as a way to work out personal problems. d. children can learn what it means to be loyal through their friendships. please select the best answer from the choices provided a b c d
The reason an ionic bond forms can best be described as.
Explanation:
the difference in electronegativity between metals and non-metals is so great that the non-metals simply take the electrons from the metals forming ions of opposite charge.
Where do electromagnetic waves move slowest?
Answer:
Solids
Explanation:
Electromagnetic waves travel fastest in empty space. But they are slowest in solids
How many electrons can there be in the 3d subshell?.