Answer: [tex]2.1 * 10^7[/tex]
Explanation: To find things in scientific notation you basically just move the decimal point so that the number is in the one's place. The exponent is the number of times you moved the decimal place. Ex. 0.000003467 would be 3.467 * 10^-6 because you moved the decimal point six times to the right.
Two groups of frogs that live in the same habitat but have
different mating seasons is an example of
a artificial selection.
b allopatric speciation.
C sympatric speciation.
d natural selection.
Answer:
c
Explanation:
Two species of frogs belonging to the same genus occasionally mate, but the embryos stop developing after a day and then die. These two frog species separate by
Stoichiometry Practice: I have the answers I just need to know how to show my work. Can someone send me a pic of the shown work for these 2 problems?
Answers:
1.
The mole ratio of AlCl₃ to Cl₂ is 2 : 3. This means for production of every 2 moles of AlCl₃ 3 moles of Cl₂ is consumed. Hence, if 3 moles of AlCl₃ is produced then Cl₂ consumed is,
= 3 × 3 / 2
= 4.5 moles of Cl₂
2.
Mole ratio of C₃H₈ to CO₂ is 1 : 3.
Hence, 0.5 moles of C₃H₈ will produce 1.5 moles of CO₂.
Also,
At STP one mole of an ideal gas occupied 22.4 L of volume. Hence, 1.5 moles of CO₂ gas will occupy,
Volume = 1.5 mol × 22.4 L/mol
Volume = 33.6 L of CO₂
To make a softball bat, a block of wood is carefully crafted into a shape that will allow a
batter to best apply force on a softball. All of the following describe physical changes that
may be used in the process of making a softball bat, EXCEPT
How many significant figures in 209.0
Your town is experiencing a drought in which the weather has been hot and dry for weeks. Infer which type of pressure system is stalled over the area. Explain your answer
The system which leads to drought is high pressure system.
What is drought?Drought refers to a situation in which there is no precipitation in an area over a long period of time. It usually results is unusually hot and dry for several weeks.
This condition of drought is usually caused by a high pressure system which leads to the drought.
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15.0 L of an ideal gas at 298 K and 3.36 atm are heated to 383 K with a new pressure of 5.40 atm. What is the new volume in liters?
Key words:-
P=PressureV=VolumeT=TemperatureHere
V1=15LT1=298KT2=383KP1=3.36atmP2=5.40atmV2=?Apply combine gas law
[tex]\\ \tt\hookrightarrow \dfrac{P1V1}{T1}=\dfrac{P2V2}{T2}[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{3.36(15)}{298}=\dfrac{5.40V2}{383}[/tex]
[tex]\\ \tt\hookrightarrow 0.169=0.014V2[/tex]
[tex]\\ \tt\hookrightarrow V2=12.1L[/tex]
Acenaphthylene, a hydrocarbon that is a constituent of a coal tar, is 94.71% and has a molar mass of 152.19 g/mol. What are the empirical and molecular formulas of acenaphthylene?
Answer:
From what I personally know, Acenaphthylene 75%. Empirical Formula (Hill Notation): C12H8. CAS Number: 208-96-8. Molecular Weight: 152.19. Beilstein: 774092. EC Number:
Explanation:
Acenaphthylene, a polycyclic aromatic hydrocarbon is an ortho- and peri-fused tricyclic hydrocarbon. The molecule resembles naphthalene with positions 1 and 8 connected by a -CH=CH- unit. It is a yellow solid. Unlike many polycyclic aromatic hydrocarbons, it has no fluorescence. Acenaphthylene/Formula is C12H8.
I'm not sure if this will help you but this is what I know so I hope it does :)
A mixture that you can see some or all of the parts of is called a:
1) mechanical solution
2) pure substance
3) mechanical mixture
4) solution
Answer:
i think a solution
Explanation:
sry dont get mad if im wrong
Balance the following chemical equation (if necessary):
SiCI4 (s) + H2O(I) → H4SiO4 (aq) + HCI(aq)
Answer: SiCl₄(s) + 4 H₂O(l) → H₄SiO₄(aq) + 4 HCl(aq)
Explanation:
You can pretend there is an imaginary line splitting the chemical equation into two on the arrow to help balance the equation.
Balance out chlorine on both sides, add the coefficient 4 to HCl
now there are 4 chlorines on the left and the right side.
Then, balance out Hydrogen on both sides, add the coefficient 4 to H₂O
now, there are 4*2=8 hydrogens on the left and 4+4=8 hydrogens on the right.
Counting the total number of atoms on both sides of the arrow, the equation is balanced
1 Si = 1 Si
4 Cl = 4 Cl
4 O = 4 O
8 H = 8 H
[tex]\\ \sf\longmapsto SiCl_4+4H_2O\longrightarrow H_4SiO_4+4HCl[/tex]
On reactant side
Si=1H=8Cl=4O=4On products side
Si=1H=8Cl=4O=4(GIVING OUT BRAINLIEST)
Compare and contrast the conditions required for snow and rain to form.
Answer:
Snow forms when the atmospheric temperature is at or below freezing, and there is a minimum amount of moisture in the air. Within a cloud, water droplets condense onto one another, causing the droplets to grow. When these water droplets get too heavy to stay suspended in the cloud, they fall to Earth as rain
Explanation:
How many grams of nitrogen are in 1.5 moles of nitrogen atoms
Answer:
42 grams
Explanation:
the conversion between moles and grams is by using the molar mass of the substance.
The molar mass for a nitrogen atom is 14.00 g/mol.
N2 has two nitrogen atoms, so its molar mass is 28.00 g/mol
To find how many grams are in 1.5 moles;
[tex]28g/mol*1.5mol[/tex]
the units of mols cancels out, leaving one with units of grams of N2
Convert 22.8 in3 to cm3. Given 1 inch = 2.54 cm. ____________cm3
Answer:
22.8 in3 to cm3
= 373.6251 cm3
I need an answer now please asap and you will me marked brainiest please it's missing I need it now.
put 2 in front of hydrogen and 1 in front of oxygen and 2 in front of water; to balance the equation.
How does the amount of energy coming from the energy source (low vs. high) affect the amount of electrical energy created.
Answer:The environmental problems directly related to energy production and Electricity is a secondary energy source that is generated producedfrom primary energy sources:
hope that helps im new so have a good day (:
Explanation:
What is the mass (in grams) of 23.00 L of propane vapor (C₃H₈) at STP?
Now
Molar mass of Propane:-
3(12)+8(1)=44g/mol[tex]\\ \tt\hookrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \tt\hookrightarrow Given\:mass=No\:of\:moles\times Molar\:mass{}[/tex]
[tex]\\ \tt\hookrightarrow Given\:mass=0.92(44)[/tex]
[tex]\\ \tt\hookrightarrow Given\:mass=40.48g[/tex]
According to mole concept, the mass in grams of 23.0 L of propane vapor at STP is 22.968 g.
What is mole concept?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
In case of determining the mass of propane at STP , first the number of moles is determined ,
number of moles=23/44=0.522 moles
As the number of moles in 44 liter is 0.522 moles
∴mass of 23 L of propane is 44×0.522=22.968 g.
Hence, at STP 22.968 g of propane is present in 23 liters of propane.
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A sample of grape juice has a hydroxide ion concentration of 1.4 x 10^-10 M. Which of these equations will
you use to find the hydronium ion concentration?
Answer:
Explanation:
grape juice
pOH = -log[1.4*10⁻¹⁰]≈9.6
pH=14-pOH=14-9.6=4.4
orange juce
pH= -log[1.8*10⁻⁴]=3.7
Orange juice has lower pH, so it is more acidic.
PLEASE HELP ME
Thermal energy always moves from a hotter area to a cooler area.
This movement is
called heat.
1.True
2.False
Answer:
true
Explanation:
because heat tempeture wise it can cool down
write the name for NaCl
The name for NaCl is Sodium chloride
Salt and it's examples.Salt is defined as the chemical compound that contains both a positively charged cation.and negatively charged anion.
It is formed by the reaction of acid and base is a neutralisation reaction.
Examples of salt include:
Sodium Chloride or Common Salt (NaCl)Sodium Hydroxide (NaOH)Sodium Carbonate or Washing Soda (Na2CO3.10H2O)Baking Soda or Sodium Bi-carbonate (NaHCO3)Bleaching Powder or Calcium Hypochlorite.Therefore another name for salt is common salt.
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1. What is the best means to separate ammonium chloride, sand, and zinc chloride? And a
mixture of zinc chloride and silver chloride?
1. A mixture of ammonium chloride, sand, and zinc chloride should be separated by sublimation.
2. A mixture of zinc chloride and silver chloride should be separated through crystallization.
What is a separation technique?A separation technique can be defined as a technique that is typically used to separate or convert two (2) or more mixture and solution of chemical substances into distinct product such as chemical compounds or elements.
The types of separation technique.In Chemistry, there are various types of separation technique used for the separation of mixtures or solutions and these include:
CrystallizationFractional distillationFiltrationEvaporationSublimationDecantationSimple distillationChromatographyIn this scenario, the most effective and efficient means to separate a mixture of ammonium chloride, sand, and zinc chloride is by sublimation from solid to gas state.
On the other hand, the best means to separate a mixture of zinc chloride and silver chloride is through crystallization.
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Jack created a table that compares the characteristics of the sun and the moon. Which of the following corrects the mistakes in Jack's table?
Sun:
Burning ball of rock, gas, and dust
Objects revolve around it
Has a round shape
Moon:
Has a round shape
Formed from chunks of rocks
Revolves around the sun
(A)The sun revolves around other stars, and the moon revolves around the sun.
(B) The sun has a round shape, and the moon is formed from chunks of metal.
(C) The sun revolves around a planet, and the moon revolves around the sun.
(D)The sun is a burning ball of gas, and the moon revolves around a planet.
Answer:
D) The sun is a burning ball of gas, and the moon revolves around a planet.
Explanation:
Unlike what Jack has written in his table, the sun is comprised of 92% gas and has no definable rocky layer or even dust. The moon revolves specifically around the Earth.
what is the mathematical relationship between the independent and dependent variables
Answer:
The independent variable influences change in the dependent variable whether the points on the scatterplot go up or down from left to right.
Explanation:
explain how the atoms are held together by tge covalent bond in a molecule of hydrogen?
Answer:
A hydrogen molecule forms from two hydrogen atoms, each with one electron in a 1 s orbital. The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond. The bond is represented either as a pair of “dots” or as a solid line. Each hydrogen atom acquires a helium-like electron configuration. Shared electrons located in the space between the two nuclei are called bonding electrons. The bonded pair is the “glue” that holds the atoms together in molecular units. The hydrogen molecule is the simplest substance having a covalent bond.
Explanation:
which of the following combinations can be used to prepare a buffer at ph 1
A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.
What is a buffer?A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.
Buffers are made from solutions of weak acids and their salts or weak bases and their salts.
What is pH?The pH of a solution is the negative logarithm to base 10 of yhe hydrogen ion concentration of the solution.
Solutions of low pH have high concentration of hydrogen ions while solutions of high pH have high hydrogen ion concentration.
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How many grams of S are in 475 g of SO2?
There are 237. 5 g of Sulfur,S in 475 g of SO2?
Calculation of grams of SulfurFrom the question, we can say that
The molar mass of sulfur = 32 g/molThe molar mass of oxygen = 16 g/molTherefore,
The molar mass for SO2 = 32 + (16 × 2) g/mol = 64 g/mol
Now,
If 1 mole of SO2 contains 1 mole of S
Then 64 g of SO2, will contain 32g of S;
Such that
475 g of SO2 will give { [tex]\frac{ 32g of S) ( 475 g of SO2)}{64 of SO2}[/tex] } = 237. 5 g of Sulfur.
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What orbits, or revolves, around most planets?
(A) Comets
(B) Moons
(C) Rings
(D) Stars
Answer:
B. Moons
In almost every planet in the Milky Way galaxy, there is at least one moon in their orbit.
Calculate the grams of ethane present in a sample containing 0.8286 moles if the molar mass of ethane is 30.067 g/mol.
In the formula CO2 what do the symbols C and O refer to
Answer:
CO2 (Carbon Dioxyde), the C refers to the Carbon atom (which is only 1) and the O(2) refers to the Oxygen atoms (which are two).
Show all calculations. 1. 2 C 4 H 10 + 13 O 2 -> 8 CO 2 + 10 H 2 O a) what mass of O 2 will react with 400 g C 4 H 10? b) how many moles of water are formed in a)?
[tex]\\ \tt\hookrightarrow 2C_4H_10+13O_2\longrightarrow 8CO_2+10H_2O[/tex]
13mol of O_2 reacts with 2mols of C_4H_10.7.5mol of O_2 reacts with 1mol of C_4H_10No of moles:-
[tex]\\ \tt\hookrightarrow \dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \tt\hookrightarrow \dfrac{400}{58}[/tex]
[tex]\\ \tt\hookrightarrow 6.89mol[/tex]
Now
Moles of O_2
[tex]\\ \tt\hookrightarrow 7.5(6.89)=51.6mol[/tex]
Mass of O_2
[tex]\\ \tt\hookrightarrow 51.6(32)=1651.2g[/tex]
In the given question, 1.3kg is the mass of [tex]\rm O_2[/tex] that will react with 400g of [tex]\rm C_4H_{10}[/tex] and 34.4 moles of [tex]\rm H_2O[/tex] are formed in the reaction.
Molar mass is the mass of one mole of a substance. It is expressed in grams per mole (g/mol).
a) To determine the mass of [tex]\rm O_2[/tex]that will react with 400 g of [tex]\rm C_4H_{10}[/tex], we need to use stoichiometry to determine the mole ratio of [tex]\rm C_4H_{10}[/tex] to [tex]\rm O_2[/tex]in the balanced chemical equation.
[tex]\rm 2 C_4H_{10 }+ 13 O_2 \rightarrow 8 CO_2 + 10 H_2O[/tex]
From the equation, we can see that 2moles of [tex]\rm C_4H_{10}[/tex] react with 13 moles of [tex]\rm O_2[/tex]. Therefore, we can set up a proportion:
2 mol / 13 mol [tex]\rm O_2[/tex]= 400 g [tex]\rm C_4H_{10}[/tex] / x g [tex]\rm O_2[/tex]
where x is the mass of [tex]\rm O_2[/tex] that will react with 400 g of [tex]\rm C_4H_{10}[/tex] .
Solving for x, we get:
x = (13 mol [tex]\rm O_2[/tex] [tex]\times[/tex] 400 g [tex]\rm C_4H_{10}[/tex] ) / (2 mol [tex]\rm C_4H_{10}[/tex] )
x = 1.3 kg [tex]\rm O_2[/tex]
b) To determine the number of moles of water formed in part a), we need to use stoichiometry again to determine the mole ratio of [tex]\rm C_4H_{10}[/tex] to [tex]\rm H_2O[/tex] in the balanced chemical equation.
[tex]\rm 2 C_4H_{10 }+ 13 O_2 \rightarrow 8 CO_2 + 10 H_2O[/tex]
From the equation, we can see that 2moles of [tex]\rm C_4H_{10}[/tex] react with 10 moles of [tex]\rm H_2O[/tex] . Therefore, we can set up another proportion:
2 mol [tex]\rm C_4H_{10}[/tex] / 10 mol [tex]\rm H_2O[/tex] = 400 g [tex]\rm C_4H_{10}[/tex] / x mol [tex]\rm H_2O[/tex]
where x is the number of moles of [tex]\rm H_2O[/tex] formed.
First, we need to convert 400 g of [tex]\rm C_4H_{10}[/tex] to moles:
400 g [tex]\rm C_4H_{10}[/tex] [tex]\times[/tex] (1 mol [tex]\rm C_4H_{10}[/tex] / 58.12 g [tex]\rm C_4H_{10}[/tex] ) = 6.88 mol [tex]\rm C_4H_{10}[/tex]
Now we can solve for x:
2 mol [tex]\rm C_4H_{10}[/tex] / 10 mol [tex]\rm H_2O[/tex] = 6.88 mol [tex]\rm C_4H_{10}[/tex] / x mol [tex]\rm H_2O[/tex]
x = (10 mol [tex]\rm H_2O[/tex] [tex]\times[/tex] 6.88 mol [tex]\rm C_4H_{10}[/tex]) / (2 mol [tex]\rm C_4H_{10}[/tex] )
x = 34.4 mol [tex]\rm H_2O[/tex]
Therefore, 1.3 kg of [tex]\rm O_2[/tex] will react with 400 g of [tex]\rm C_4H_{10}[/tex] .34.4 moles of water are formed when 400 g of [tex]\rm C_4H_{10}[/tex] .
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Select the conversion factors needed to convert the cost of gas from dollars per gallon to the cost in euros per liter.
3.17 dollars
х
0.946 euros
1L
1 gal
Answer Bank
1.13 euros
1 dollar
1 dollar
1.13 euros
3.7854 L
1 gal
1 gal
3.7854 L
The correct conversion factor would be 0.24 euro per liter
Unit conversion1 dollar = 0.89 euro
Also,
1 gallon = 3.785 liters
Thus, 1 dollar/gallon = 0.89 euro/3.785 liters
If 0.89 euro is for 3.785 liters, 1 liter would be:
1 x 0.89/3.785/= 0.24 euro
Thus, the cost of gas from 1 dollar per gallon would be 0.24 euro per liter
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Identify which balance was used to make each mass reading. 0.90 g Choose... 1.230 g Choose... 5.43 g Choose... 4.0000 g Choose... 6.539 g Choose...
The balance that can be used to measure a mass reading of 0.90 g will be a balance with ±0.01 g tolerance.
The mass reading balance used for measurement
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
What is the tolerance of a balance?The tolerance of a balance is the number of decimal place values shown on the balance and it is the permissible limitations measured in grams, that a balance can tolerate.
Hence, depending on the decimal place value behind a mass reading will determine the balance used for measurement.From the given parameters:
The mass reading balance used for measurement
0.90 g ±0.01 g tolerance
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
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