Answer:
Because heat causes alcohol to volatilize, instead of burning it.
The combustion is not fulfilled since this is detached from the surface of the banknote that would be the necessary product to burn, in addition to considering that the necessary temperature is not reached
Explanation:
When water and alcohol are joined, they form a solution with high evaporation power, plus alcohol that has a higher degree of volatility than water, this is how these liquids are not retained on the surface of the banknote with heat and they are not it burns.
HELP
Question 17
How many nitrogen atoms are in a 2.51 mol sample of N2O?
Link to Periodic Table of the Elements
09.06 x 1024
O 4.17 x 10 24
O 3.02 x 1024
O 1.51 X 1024
ELP BRAINLIEST
Answer:
3.02× 10²⁴ atoms
Explanation:
Given data:
Number of nitrogen atoms = ?
Number of moles of N₂O = 2.51 mol
Solution:
1 mole contain 2 mole of nitrogen atoms.
2.51 × 2 = 5.02 mol
According to Avogadro number,
1 mole = 6.022 × 10²³ atoms
5.02 mol × 6.022 × 10²³ atoms / 1 mol
30.2 × 10²³ atoms
3.02× 10²⁴ atoms
did the mixture boil faster
Answer:
no it will take more time to boil
What is the atomic symbol for lead?
Answer:
Pb
Explanation:
Answer:
Pb is the answer You're looking for
A__is a small unit of matter.
A energy
B particle
C diffusion
Answer:
b
Explanation:
How many moles are in 4.30 grams of lead (Pb) ?
Answer:0.005 moles
Explanation: 4.3/207 moles = 0.005
N2 reacts with hydrogen gas according to the following equation:
N2 + 3 H2 → 2 NH3
If 41.93 grams of N2 reacts, how many grams NH3 is produced?
Answer:
Mass = 51 g
Explanation:
Given data:
Mass of nitrogen = 41.93 g
Mass of ammonia formed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 41.93 g/ 28 g/mol
Number of moles = 1.5 mol
now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
1.5 : 2/1×1.5 = 3 mol
Mass of ammonia formed:
Mass = number of moles × molar mass
Mass = 3 mol × 17 g/mol
Mass = 51 g
A student titrates 0.2087 g of an unknown diprotic acid with 0.1224 M sodium hydroxide. It takes 32.47 mL of the NaOH solution to reach the endpoint. How many moles of NaOH are used in the titration
Given :
A student titrates 0.2087 g of an unknown diprotic acid with 0.1224 M sodium hydroxide.
It takes 32.47 mL of the NaOH solution to reach the endpoint.
To Find :
How many moles of NaOH are used in the titration.
Solution :
Number of moles( n ) is given by :
n = Molarity × Volume( in liters )
n = [tex]0.1224 \times \dfrac{32.47}{1000}\ moles[/tex]
n = 0.00397 moles.
Therefore, moles of NaOH are used in the titration is [tex]3.97\times 10^{-3} \ moles[/tex].
The number of moles of NaOH are used in the titration is [tex]3.97 \times 10^{-3}[/tex] moles.
The calculation is as follows;The number of moles should be
[tex]= molarity \times volume\\\\= 0.1224 \times \frac{32.47}{1000}[/tex]
= 0.00397 moles.
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30 g of Magnesium and 30 g of Oxygen are reacted,
then the residual mixture contains
Answer:
2Mg + O2 -> 2MgO
Explanation:
According to the above reaction ,
28.6g(2mole) Mg combine with 32g (1mole) of O2 to give 80.6g (2 mole) of MgO.
thus,
30g Mg will combine with 20g of O2 to produce 50g MgO and 10gO2 will remain unreactive.
I hope it's helpful!
Why does solid water (ice) float when placed in liquid water? *
Ice does not float in liquid water.
Ice is less dense than liquid water.
Ice is more dense than liquid water.
The densities of liquid water and ice are the same .
Answer:
Ice is less dense than water.
What is the volume of 0.4 moles carbon dioxide at STP?
Answer:
Hi I ll explain
Explanation:
[tex]0.4mol \times \frac{22.4liter}{1mol} = 8.96liter[/tex]
Remember
At STP always one mole of every gas equals 22.4 liter
How many electrons does an ion of magnesium have if it’s represented by the symbol shown below? 25Mg2+
Answer:
10 electrons.
Explanation:
Hello!
In this case, since a normal atom of magnesium has 12 protons and electrons when is not in the form of a cation, since it is a metal that tends to lose electrons when ionized, and therefore it becomes positively charged, we infer that in form of:
[tex]Mg^{2+}[/tex]
It only has 10 electrons.
Best regards!
Which electron-dot structure represents a non-polar
molecule?
Answer:
CH4
Explanation:
It is a symmetrical molecule thus making it a non-polar molecule
what volume of 7.25 mol/L stock solution in needed to make 3.84 L of 8.50 mol/L solution?
Answer:
4.50 L
Explanation:
First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:
3.84 L * 8.50 mol/L = 32.64 molNow, keeping in mind that
Concentration = Mol / Volumewe can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:
Volume = Mol / ConcentrationVolume = 32.64 mol ÷ 7.25 mol/LVolume = 4.50 LSo we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.
MULTIPLE CHOICE QUESTION
Popcorn popping in a pot on the stove
is an example of:
1.The Kelvin scale
2.radiation
3.conduction
4.convection
Will give Brainiest answer
Answer:
Confection
Explanation:
Answer:
2 - Radiation
Explanation:
The air above the stove is heated and because it is gas, moves upward. This is convection. The bottom of the pot and the surface of the stove are not 100% flat. In those areas where the stove and the bottom of the pot are not in contact, radiation transports heat from the stove to the heat. Which heats up the kernals.
Compared to the cells in a healthy body, Elisa’s cells are getting far fewer _________ molecules.
Answer:
Glucose
Explanation:
This question is taken from a story that's on the internet titled "diagnosing Elisa".
Now, the diagnosis of Elisa found out that Elisa felt tired because her cells were not getting the daily amount of molecules they required from food and air and this made her cells not to function, grow & repair efficiently. In addition, the diagnoses further explained lack of molecules to mean that although that Elisa's cells were getting sufficient oxygen and amino acids molecules, but did not get sufficient glucose molecules.
A thermometer containing 8.3 g of mercury has broken. What volume, in milliliters, of mercury spilled?
The volume of Mercury spilled : 0.613 milliliters
Further explanationGiven
8.3 g of Mercury
Required
The volume
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Density of mercury : 13.534 g/cm³
Input the value :
V = m : ρ
V = 8.3 g : 13.534 g/cm³
V = 0.613 cm³= 0.613 ml
A 45.0 g sample of a metal at 85.6 °C is placed in 150.0 g of water at 24.6 °C. The final temperature of the system is 28.3 °C. Calculate the specific heat of the metal.
Answer:
904.014 j/kgk
Explanation:
Mass of metal = 45g
Temperature of metal = 85.6°
Mass of water = 150
Temperature of water = 24.6
Final temperature of system = 28.3
Heat lost by metal = Heat gained by water
m1 * c1 * dt = m2 * c2 * dt
Q = quantity of heat
Q = m*c*dt
dt = change in temperature
dt of water = 28.3 - 24.6 = 3.7
dt of metal = 85.6 - 28.3 = 57.3
Specific heat capacity of water, c = 4200
(45 * 10^-3) * c * 57.3 = (150 * 10^-3) * 4200 * 3.7
2.5785c1 = 2331
c1 = 2331 / 2.5785
= 904.01396
= 904.014 j/kgk
why do each of the elements react differently?
H2(g)+p4(s)ph3(g) what the answer ?
Answer:
6H2 + P4→ 4PH3
Explanation:
Phosphorus has 4 in it and hydrogen has 3 in it. in order to balance it, we have to put 4 in front of phosphine so that the phosphorus on the product side has an equal amount as to the one on the reactant side.
the only one left to balance is hydrogen and so in order to balance it we put a 6 on h2 because the hydrogen in the product size becomes 12 (4 * 3).
therefore the hydrogen on the reactant side becomes 12 as well (6 * 2)
The balanced chemical reaction is:
[tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]
Explanation:
In a balanced chemical equation number of atoms of all the elements are equal on the reactant side and product side.The given equation of the chemical reaction is not balanced.[tex]H_2(g)+P_4(s)\rightarrow PH_3(g)[/tex]
Balancing the chemical reaction:
Balance the atoms of all the elements besides hydrogen and oxygen. Balance phosphorus atoms by writing 4 in front of phosphine gas on the product side.[tex]H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]
Now balance the hydrogen atoms. There are 12 hydrogen atoms on the product side and 2 hydrogen atoms on the reactant side. So by writing 6 in front of hydrogen gas on the reactant side.[tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]
So, the balanced chemical reaction is:
[tex]6H_2(g)+P_4(s)\rightarrow 4PH_3(g)[/tex]
Learn more about the balanced chemical reaction here:
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Can Someone help me with this problem?
GIVING BRAINEST NOW!!! THANK YOU LUV
1. Write the terms galaxies, galaxy clusters, stars, and universe in the diagram to show which objects contain the other objects.
IT KINDA LOOKS LIKE THIs but side ways
Answer:
i dont know how exactly you want this but ill give it a go
the sun is a star, the diagram is a diagram of a galaxy, and the outside of the rings contains everything else???
Explanation:
im sorry i tried i really dont know.
Please help me fill in this answer........
I’ll mark brainliest
Help me please
:)
Answer:
the amount of atoms and particle I think is in here is 17 that oxygen and water can hold with the amount of barium hydrogen.
Suggest why people used to believe that water was an element.
It is right? or is it ice and acid at the samee timeee?
how many grams of carbon are in 12x10^23 atoms of carbon
Answer:23.9 g
Explanation:
Grams C = (12/6.02214076)*12 = 23.9 g
There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.
As we know that, atomic mass of carbon is 12.
It means that, In one mole of carbon , 12 grams of carbon is present.
1 mole [tex]=6.022*10^{23} atoms[/tex]
In [tex]6.022*10^{23}[/tex] atoms of carbon, 12 grams of carbon is present.
So, In [tex]12*10^{23}[/tex] atoms of carbon,
[tex]=\frac{12}{6.022*10^{23} }*6*10^{23}\\\\=23.9 grams[/tex]
There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.
Learn more:
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What is the local, day-by-day changes in the atmoshpheres condition called? A. climate B. weather C. temperature D. precipitation
Answer:
B.
Explanation:
Weather changes daily and varies in different areas around the world
A solution is made by mixing of chloroform and of heptane . Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.
Answer:
0.53
Explanation:
A solution is made by mixing 42 g of chloroform (CHCl₃) and 31 g of heptane (C₇H₁₆). Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.
Step 1: Calculate the number of moles of chloroform
The molar mass of CHCl₃ is 119.38 g/mol.
42 g × 1 mol/119.38 g = 0.35 mol
Step 2: Calculate the number of moles of heptane
The molar mass of C₇H₁₆ is 100.20 g/mol.
31 g × 1 mol/100.20 g = 0.31 mol
Step 3: Calculate the total number of moles
We will use the following expression.
n = nCHCl₃ + nC₇H₁₆ = 0.35 mol + 0.31 mol = 0.66 mol
Step 4: Calculate the mole fraction of chloroform
We will use the following expression.
χ(CHCl₃) = nCHCl₃ / n
χ(CHCl₃) = 0.35 mol / 0.66 mol = 0.53
A mixture of gases contains 4.46 moles of neon (Ne), 0.74 mole of argon (Ar), and 2.15 moles of xenon (Xe). Calculate the partial pressures of the gases if the total pressure is 2.00 atm at a certain temperature.
Explanation:
The partial pressure of an individual gas is equal to the total pressure of the mixture multiplied by the mole fraction of the gas.
Total pressure = 2atm
Mole Fraction = number of moles / total number of moles
Neon
Mole Fraction = 4.46 / 7.35 = 0.607
Partial Pressure = 0.607 * 2 = 1.214 atm
Argon
Mole Fraction = 0.74 / 7.35 = 0.101
Partial Pressure = 0.101 * 2 = 0.202 atm
Xenon
Mole Fraction = 2.15 / 7.35 = 0.293
Partial Pressure = 0.293 * 2 = 0.586 atm
Imagine you have an object with a non-geometric shape having a mass of 26.7 g and
a density of 0.767 g/mL. If it were placed in a graduated cylinder containing 20.0 mL
of water what would you expect the new water level to read? [Assume the sample is
completely submerged and everything is done at 25°C]
Answer:
The new reading of the water level is 54.81 mL.
Explanation:
From the question given above, the following data were obtained:
Mass of object = 26.7 g
Density of object = 0.767 g/mL
Volume of water = 20 mL
New reading of the water level =?
Next, we shall determine the volume of the object. This can be obtained as follow:
Mass of object = 26.7 g
Density of object = 0.767 g/mL
Volume of object =?
Density = mass /volume
0.767 = 26.7 / volume of object
Cross multiply
0.767 × Volume of object = 26.7
Divide both side by 0.767
Volume of object = 26.7 / 0.767
Volume of object = 34.81 mL
Finally, we shall determine the new reading of the water level. This can be obtained as follow:
Volume of water = 20 mL
Volume of object = 34.81 mL
New reading of the water level =?
New reading of the water level = (Volume of water) + (Volume of object)
New reading = 20 + 34.81
New reading of the water level = 54.81 mL
BRAINLIEST IF YOU GIVE ME A LEGIT ANSWER
Answer: its Important that the new cells have a copy of every chromosome so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set
Explanation:ye
Answer: In mitosis a cell divides to form two identical cells. It is important that the cells have a copy of every chromosome, so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set.
A 1500 kg race car accelerates at a rate of about 9M /s2 as to how much force does the engine need to create for this to happen
Answer:
13500 N
Explanation:
According to newtons second law of motion
mass m =1500 Kg
a = 9m/s^2
Force F = mass m × acceleration a
F = 1500×9= 13500 N
