Answer:
- Because it has or not the same number of atoms at each side.
- Because the mass of reactants and product is or not the same after the reaction.
Explanation:
Hello!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed; when we see a chemical reaction, we need to make sure that the amount of atoms is the same at both reactants and products; for instance the formation of water requires four hydrogen atoms and two oxygen atoms at both reactants and products sides as shown below:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Another way is by proving that the total mass of products equals the total mass of reactants once the reaction has gone to completion.
Best regards!
30 POINTS HELP Which idea was supported by Aristarchus, Copernicus, and Galileo?
The planets have epicycles.
The planets revolve around the Sun.
The stars rotate around the Sun.
The center of the solar system is Earth.
Answer:
SO SORRY it took so long but the answer is B :)
Explanation:
Trust me and good luck :)
The theory that the planets move around the sun was endorsed by Aristarchus, Copernicus, as well as Galileo. The solar system revolves around the sun.
What is Aristarchus?Aristarchus of Samos was just a Greek astronomer that suggested the very first heliocentric model of the cosmos, wherein the sun, rather than the earth, was even at its center. Despite the fact that his hypothesis was acknowledged by other philosophers of the time, it was dismissed as unrealistic, and the geocentric model remained in use for the next 1,700 years.
What is Copernicus?Copernicus was also the first to assert that the Earth as well as the other planets orbit the sun. It was really a significant shift in thinking.
What is sun?Sun can be considered as a star in solar system.
The theory that the planets move around the sun was endorsed by Aristarchus, Copernicus, as well as Galileo. The solar system revolves around the sun.
Therefore, the correct answer will be option (b).
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50g nitrous oxide combines with 50g oxygen form dinitrogen tetroxide according to the balanced equation below.
2N20 + 302 - 2N204
Limiting reactant : O₂
Mass of N₂O₄ produced = 95.83 g
Further explanationGiven
50g nitrous oxide
50g oxygen
Reaction
2N20 + 302 - 2N204
Required
Limiting reactant
mass of N204 produced
Solution
mol N₂O :
[tex]\tt =\dfrac{50}{44}=1.136[/tex]
mol O₂ :
[tex]\tt =\dfrac{50}{32}=1.5625[/tex]
2N₂O+3O₂⇒ 2N₂O₄
ICE method
1.136 1.5625
1.0416 1.5625 1.0416
0.0944 0 1.0416
Limiting reactant : Oxygen-O₂
Mass N₂O₄(MW=92 g/mol) :
[tex]\tt =mol\times MW=1.0416\times 92=95.83~g[/tex]
(I will give a brainliest) State the relationship between phase changes and temperature
Answer:
The relationship is the "variation of vapour pressure with temperature" or " the effect of vapour pressure on the melting and boiling points in a phase"
Which one please help!!
AgCl⇒ the precipitate
Further explanationGiven
Reaction
2AgNO₃+CaCl₂⇒2AgCl+Ca(NO₃)₂
Required
The precipitate
Solution
Solubility rules :
soluble compound :
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺
So AgCl⇒ the precipitate
Ca(NO₃)₂⇒aqueous
A sample of gas has a density of 0.53 g/L at 225 K and under a pressure of 108.8 kPa. Find the density of the gas at 345 K under a pressure of 68.3 kPa. Assuming the mass is equal to 1 gram.
Answer:
[tex]\rho _2=0.22g/L[/tex]
Explanation:
Hello!
In this case, since we are considering an gas, which can be considered as idea, we can write the ideal gas equation in order to write it in terms of density rather than moles and volume:
[tex]PV=nRT\\\\PV=\frac{m}{MM} RT\\\\P*MM=\frac{m}{V} RT\\\\P*MM=\rho RT[/tex]
Whereas MM is the molar mass of the gas. Now, since we can identify the initial and final states, we can cancel out R and MM since they remain the same:
[tex]\frac{P_1*MM}{P_2*MM} =\frac{\rho _1RT_1}{\rho _2RT_2} \\\\\frac{P_1}{P_2} =\frac{\rho _1T_1}{\rho _2T_2}[/tex]
It means we can compute the final density as shown below:
[tex]\rho _2=\frac{\rho _1T_1P_2}{P_1T_2}[/tex]
Now, we plug in to obtain:
[tex]\rho _2=\frac{0.53g/L*225K*68.3kPa}{345K*108.8kPa}\\\\\rho _2=0.22g/L[/tex]
Regards!
A solution is made by mixing 37.g of thiophene C4H4S and 72.g of heptane C7H16. Calculate the mole fraction of thiophene in this solution. Round your answer to 2 significant digits.
Answer:
0.38
Explanation:
Molar mass of thiophene= 84g/mol
Mass of thiophene = 37g
Number of moles= 37/84= 0.44 moles
Molar mass of heptane= 100 g/mol
Mass of heptane = 72g
Number of moles = 72/100= 0.72 moles
Total number of moles= 0.44 + 0.72= 1.16 moles
mole fraction of thiophene = 0.44/1.16= 0.38
The sugar in your kitchen has a molar mass of 342.3 g/mol. How many particles are present inside a sugar bowl if there are 250 grams of sugar in it?
A. 1.5 x 10^26 particles
B. 6.02 x 10^23 particles
C. 4.4 x 10^23 particles
D. 1.8 x 10^21 particles
Number of particles inside a sugar bowl = 4.4 x 10²³
Further explanationGiven
The molar mass of sugar = 342.3 g/mol
mass of sugar = 250 g
Required
Number of particles
Solution
1 mol = 6.02 x 10²³ particles
mol of sugar :
[tex]\tt mol=\dfrac{mass}{molar~mass}[/tex]
mol = 250 g : 342.3 g/mol = 0.73 mol
Number of particles :
N = n x No
N = 0.73 x 6.02 x 10²³
N = 4.39 x 10²³ ≈ 4.4 x 10²³
The IUPAC name of(CH3)2CHCH2CH=CH2
Answer:
4-Methyl-1-pentene
Explanation:
According to the International Union of Pure and Applied Chemistry (IUPAC), IUPAC nomenclature of organic chemistry is defined as the system of naming organic chemical compounds.
There are certain rules for naming organic chemical compounds as per IUPAC. The name of given (CH3)2CHCH2CH=CH2 will be based on the same rules.
At first find out the longest continuous chain and number the chain consecutively (preference given to double and single bonds), so numbering will start from right to left. the given chemical is 5 Carbon chain long.Then, identify the groups attached to this chain. Methyl is the only group attached to this chain at 4 Carbon.Assemble the name in alphabetical order using the full name using correct prefix and suffix.4-Methyl-1-pentene is the name of this chemical, as methyl is in 4th carbon position, Pent for 5 carbon chain and -ene (suffix) for one double bond).
Hence, the correct answer is "4-Methyl-1-pentene".
How would a long period without sunlight affect the food web?
It would cause consumers to consume more food.
It would have no effect on the food web.
It would stop decomposers from breaking down matter.
It would stop producers from producing food.
Answer: it would stop producers from producing food.
Explanation: why? Without the action of the producers to turn sunlight into food, the producers would die, and consumers that rely on them would lose their food source and die too.
Answer:
It would stop producers from producing food
Explanation:
Producers would die, and if producers died, consumers would die too.
Hope this helps
Weather, erosion and deposition will change the environment over time. When water runs over rocks it can smooth out jagged edges and even leave streak on the surface of the rock. This is an example of _____________.
Answer:
erosion.
Explanation:
A 14.0 tank contains 250 g of methane (CH4) gas at 27 atm at 298 K. Accidentally, 190 g of CO2 was added to the tank. What will be the resulting pressure of the mixture in the tank? Assume that no CH4 leaked out as the CO2 gas waa being added.
Answer:
[tex]P=34.8atm[/tex]
Explanation:
Hello!
In this case, since the tank has a constant volume as well as temperature, we would be able to compute the resulting pressure via:
[tex]P=\frac{n_TRT}{V}[/tex]
Whereas the total moles are computed by adding the moles of each gas as shown below:
[tex]n_{CH_4}=250gCH_4*\frac{1molCH_4}{16.05gCH_4}=15.6molCH_4\\\\n_{CO_2}=190g CO_2*\frac{1molCO_2}{44.01gCO_2}=4.32molCO_2\\\\n_T= 15.6molCH_4+4.32molCO_2\\\\n_T=19.9mol[/tex]
Thus, we plug in the total pressure, temperature and volume to get the resulting pressure:
[tex]P=\frac{19.9mol*0.08206\frac{atm*L}{mol*K}*298K}{14.0L}\\\\P=34.8atm[/tex]
Best regards!
Question 5 of 10 How are the different types of electromagnetic waves organized? A. By velocity on the electromagnetic spectrum B. By speed on the electromagnetic spectrum C. By frequency on the electromagnetic spectrum O D. By peak height on the electromagnetic spectrum
Compare the orbital notations of the substances investigated in this experiment with their attraction to the magnet. What unique feature in the orbital notation could be used to predict an attraction to a magnet
Answer:
Number of unpaired electrons
Explanation:
We know that for the compounds listed, the nature of the electrons in the d orbitals affects their interaction with an applied magnetic field.
If there are unpaired d electrons present, the compound is paramagnetic and is more strongly attracted to a magnetic field.
Similarly, if there are paired d electrons, the compound is diamagnetic and is less strongly attracted to a magnetic field.
which statement is true for photosynthesis
A. producers use it B. consumers use it C. scavengers use it D. decomposers use it
Answer: all of them duuuuuuuuuuuuuuuuuuuuuuuuuuuuu
Which word describes the amount of matter an object contains?
altitude
density
mass
pressure
Answer:
Mass
Explanation:
Answered this question multiple times and got it correct
Hope this helped!
Stay safe!
2
A sample of water has a volume of two liters and is shaped like a cylinder in one container. In a much larger container, the water
still has a volume of two liters, but it is shaped like a rectangle
What state of matter is the water in?
OA. Solid
OB. magnetic
OC. plasma
OD. liquid
Reset
Submit
Answer:
D. liquid
Explanation:
Matter, which is any substance that has weight and occupies space, can exists in three states namely: solid, liquid and gaseous. In this question, water is being described as matter.
According to this question, a sample of water of volume 2litres is shaped like a cylinder in one container and shaped like a rectangle in another larger container. Based on this observation, the water sample is in a LIQUID STATE because a liquid has no indefinite shape but takes the shape of its container.
Hence, this water sample, takes the shape of its cylindrical container in the first scenario and shape of its rectangular container in the second scenario.
What type of chemical reaction is taking place?
A. Synthesis
B. decomposition
C. single replacement
D. double replacement
double replacement
Explanation:
it's double replacement
(4) NH3+02- NO+H2O
balance the equation
Answer:
4NH₃ + 5O₂ —> 4NO + 6H₂O
Explanation:
NH₃ + O₂ —> NO + H₂O
The above equation can be balance as follow:
NH₃ + O₂ —> NO + H₂O
There 3 atoms of H on the left side and 2 atoms on the right side. It can be balance by 4 in front of NH₃ and 6 in front of H₂O as shown below:
4NH₃ + O₂ —> NO + 6H₂O
There are 4 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NO as shown below:
4NH₃ + O₂ —> 4NO + 6H₂O
There are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O₂ as shown below:
4NH₃ + 5O₂ —> 4NO + 6H₂O
Thus, the equation is balanced.
what are all the ways that a substance can change state?
Explanation:
hdhehdbrhdns dhdjdjdhrjs dhfirjr rudjdbe dbdud d
Answer:
Matter can change from one state to another if heated or cooled. If ice (a solid) is heated it changes to water (a liquid). This change is called MELTING. If water is heated, it changes to steam (a gas).
Explanation:
Phosgene is a highly toxic gas made up of carbon, oxygen, and chlorine atoms. Its density at 1.05 atm and 258C is 4.24 g/L. (a) What is the molar mass of phosgene
Answer:
Molar mass = 99 g/mol
Explanation:
Phosgene contains carbon, oxygen and chlorine atoms. Its molecular formular is; COCl2
The molar mass is given as the sum off the individual atomic mass of the elements in the compound.
Molar mass = C + O + 2Cl
Molar mass = 12 + 16 + 2(35.5)
Molar mass = 99 g/mol
.. Identify how many atoms of each element are in the molecule: H2O2
Answer : There are 2 atoms of hydrogen element and 2 atoms of oxygen element are in [tex]H_2O_2[/tex] molecule.
Explanation:
Molecule : It is the smallest particle in the chemical compound or chemical element that has the same chemical properties of that compound or element.
Atom : It is the smallest unit of matter.
The given molecule is [tex]H_2O_2[/tex].
In the molecule of [tex]H_2O_2[/tex], there are two elements which are hydrogen and oxygen.
In the molecule of [tex]H_2O_2[/tex], there are 2 atoms of hydrogen element and there are 2 atoms of oxygen element.
Hence, there are 2 atoms of hydrogen element and 2 atoms of oxygen element are in [tex]H_2O_2[/tex] molecule.
62.4 mL of an HNO3 solution were
titrated with 56.25 mL of a 0.235 M
KOH solution to reach the
equivalence point. What is the
molarity of the HNO3 solution?
The molarity of the HNO₃ solution : 0.212 M
Further explanationGiven
62.4 mL HNO₃
56.25 mL of a 0.235 M KOH
Required
Molarity HNO₃
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
1= HNO₃, 2 = KOH
n = acid base valence (amount of H⁺/OH⁻ released,for HNO₃ and KOH = 1)
Input the value :
M₁ x 62.4 x 1 = 0.235 x 56.25 x 1
[tex]\tt M_1=\dfrac{0.235\times 56.25\times 1}{62.4\times 1}\\\\M_1=0.212[/tex]
Answer:
0.212
Explanation:
HELP PLEASE
A sudden gust of wind increases the velocity of a sailboat relative to the water surface from 3.0m/s over a period of 30.0s. Using the formula a=change in velocity /t, what is the average acceleration of the sailboat?
•2.5m/s2
•1.2m/s2
•25m/s2
•0.083m/s2
( the 2's are exponents)
Answer:
average velocity for the time interval from t = 2 s to t = 4 s? ... fractional difference in the two methods when a steady wind blows along the car's route and the ... weight, but when the film reaches the drop, the drop's water suddenly ... boat, moving with constant velocity, that is 12 m from the point of impact when the key is.
Explanation:
ABOVE
The average acceleration of the sail boat is 0.083 m/s². Thus option d is correct.
What is acceleration?Acceleration is defined as the rate of change of velocity of an object with respect to time.
It is a vector quantity.
Acceleration can also be defined as the velocity change rate over time, in terms of both speed and direction
Average acceleration is defined as the rate of change of velocity of an object for the particular interval of time.
Average acceleration can also be defined as the change in velocity divided by the time elapsed.
It is measured in meter per second.
Average acceleration = Change in velocity / time
= 5.5 - 3.0 / 30.0
= 0.083 m / s²
Thus, the average acceleration of the sail boat is 0.083 m/s². Thus option d is correct.
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Your question is incomplete, but probably your complete question was
A sudden gust of wind increases the velocity of a sailboat relative to the water surface from 3.0m/s to 5.5m/s over a period of 30.0s. Using the formula a=change in velocity /t, what is the average acceleration of the sailboat?
•2.5m/s2
•1.2m/s2
•25m/s2
•0.083m/s2
What is public participation? Why is it
necessary for environmental conservation
Answer:
maile pani aii khojeko tmle sideko dekhya ani thicheko ani comment garya haha
Given the conditional statement ~p → q, which statement is logically equivalent?
A. p → ~q
B. ~p → ~q
C. ~q → ~p
D. ~q → p
Answer:
A. p → ~q
Explanation:
I am double checking.
Balance the following chemical equation: CH4+ Cl2 → CCl4+ HCI
Explanation:
CH4+8/2Cl2—>CCl4+4HCl
that is,1molecule of methane+8/2 molecules of dichlorine—>1molecule of carbon tetrachloride+4molecules of hydrogen chloride
Which of the following are examples of chemical energy being released or stored?
I. A car battery reacting and releasing energy
II. A girl eating a sandwich which helps her move
III. Propane burning on a barbecue
Answer:
it is all of the above
Explanation:
b. Potassium is more reactive than Sodium.
Answer:
Potassium is more reactive than sodium. Potassium is a bigger atom and has lesser ionisation energy than sodium so it is more reactive.
Which term related to electromagnetism applies only to magnetic force
whats the Number of molecules in 1.500 mole of H2O
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H[tex]_2[/tex]O.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles =1.500 mole
substituting all the given values in the above equation, we get
number of atoms/molecules=1.500 × 6.022×10²³(Avogadro number)
number of atoms/molecules =9.033×10²³molecules
Therefore, 9.033×10²³ is the number of molecules in 1.500 mole of H[tex]_2[/tex]O.
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