Answer:
It’s one of the most popular mobile networks across the UK, but it seems that O2 is having issues this morning
explanation:
According to Down Detector, the issues started at around 10:41 BST, and are affecting users across the UK.
Of those who reported issues, 74% said they were having problems with their mobile phone, 13% with the network, and 11% with mobile internet.
Speaking to Mirror Online, an O2 spokesperson said: "The earlier issue we experienced where some customers may have had difficulty using mobile data has now been resolved. Our technical teams are continuing to closely monitor the situation. We apologise for any inconvenience."
En un vaso se han puesto 250 g de alcohol junto con 2 g de yodo, que se disuelven completamente. Calcular la concentración de la disolución en % en masa.
The translation of the question is
250 g of alcohol have been put in a glass together with 2 g of iodine, which dissolve completely. Calculate the concentration of the solution in% by mass?
Answer:
The %mass by mass of the given solution is 0.794%
Explanation:
We are given
Mass of solute(Iodine) = 2g
Mass of the solvent (Alcohol) = 250g
Since the Iodine dissolves completely in Alcohol
Total mass of the solution = 250 + 2 = 252g
the formula of concentration of the solution in % by Mass is given by
%[tex]\frac{w}{W} = \frac{Mass of the solute*100}{Total mass of the solution}[/tex]
%w/W = [tex]\frac{2*100}{252}[/tex]
= 0.794%
Therefore the %mass by mass of the given solution is 0.794%
X-rays had a frequency of about 3x10^18 determine it's wavelength (in nm) and energy per photon
Answer:
λ = 0.1 nm
E = 2 × 10⁻¹⁵ J
Explanation:
Step 1: Given data
Frequency of X-rays (ν): 3 × 10¹⁸ s⁻¹
Step 2: Calculate the wavelength (λ) of a photon of X-rays
We will use the following expression.
c = λ × ν
where,
c: speed of light
λ = c / ν
λ = (3.00 × 10⁸ m/s) / 3 × 10¹⁸ s⁻¹
λ = 1 × 10⁻¹⁰ m × (10⁹ nm/1 m) = 0.1 nm
Step 3: Calculate the energy (E) of a photon of X-rays
We will use the following expression.
E = h × ν
where,
h: Planck's constant
E = 6.63 × 10⁻³⁴ J.s × 3 × 10¹⁸ s⁻¹
E = 2 × 10⁻¹⁵ J
Which of these is an example of a hypothesis?
Add different kinds of soil to three potted plants.
Observe fish swimming up a stream.
Temperature changes may be due to wind patterns.
Wonder why some layers of rocks contain fossils.
how many moles of tin are there in 50 g of tin (II) oxide
Answer:
Moles of tin = 0.37 mol
Explanation:
Given data:
Mass of tin oxide = 50 g
Moles of tin = ?
Solution:
Number of moles of SnO:
Number of moles = mass/molar mass
Number of moles = 50 g/ 134.71 g/mol
Number of moles = 0.37 mol
We can see there is only one mole of Sn is present in one mole of tin oxide.
Thus in 0.37 mol of tin oxide,
0.37 mol × 1 = 0.37 mol of tin
How many grams are in 1.5moles of calcium
Answer: 60.117 g
Explanation: [tex]1.5 mol Ca = \frac{40.078g/mol}{1mol}[/tex] multiply and quit all "mol" and you get the grams
what is a metorlogist
an expert in or student of meteorology; a weather forecaster.
help me pleaseeeee, if you do tyyy :)
1.Identify the types of bonds between the carbon and the two oxogen molecules in the carbon dioxide molecule
2.then describe the bond angle
3. Explain how the structural formula can be used to determine bond angles .
True or false: an amplifier can adjust the amplitude
Answer:
ᴛʀᴜᴇ.................
Stop telling people how you feel they do not wanna hear you're problems tell them to God man these people don't care what you gotta say I just had to tell y'all this and write it in a notebook please I'm tryna tell y'all that's the key kings and queens stay humble 2021 is the new year and new u
Answer:
Preach!
Explanation:
Please help me answer this question.
Explanation:
Hydrochloric acid is HCl.
Hydrogen is H2.
Mole ratio is the numbers infront of them, which is 6 : 3.
Answer:Hydrochloric acid is HCl.
Hydrogen is H2.
Explanation:
On the graph, which dimension would be changed if the rate of reaction were to be altered by a catalyst?
Answer:
The alteration of the rate of the chemical reaction by the addition of a catalyst will change the dimension of L
Explanation:
The parts of the Energy profile of a reaction diagram the given letters represent are;
K = The energy possessed by the reactants
L = Activation energy required for the reaction to take place
M = Energy threshold required for the reaction to take place
N = The change in the enthalpy from the reactants to the products, which is also the energy released
O = The energy possessed by the products
The addition of a catalyst changes the route with which the reaction takes place such that the reaction rate is increased because the activation energy, L, is reduced.
Therefore, the dimension that will be changed if the rate of reaction were to be altered by a catalyst is L.
How much energy is required to melt 2 kg of copper? Use the table below and
this equation: Q = mLfusion:
414 kJ energy is required to melt 2 kg of copper. Hence, option B is correct.
What is energy?Energy is the capacity for doing work.
Given parameters:
Mass of copper = 2kg
Unknown:
Amount of energy required to melt the copper =?
Solution:
To solve this problem, we use:
Q = m L
m is the mass
L is the latent heat of fusion of copper = 207kJ/kg
So;
Q = 2 x 207 = 414kJ
Hence, option B is correct.
Learn more about energy here:
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5) Determine the mass if lithium hydroxide that is produced when 12.87 g of lithium nitride reacts with
an excess of water according to the following process:
Li,N + 3 H2O + 3 LiOH + NH,
Answer:
Mass = 26.58 g
Explanation:
Given data:
Mass of lithium nitride = 12.87 g
Mass of lithium hydroxide produces = ?
Solution:
Chemical equation:
Li₃N + 3H₂O → 3LiOH + NH₃
Number of moles of of Li₃N:
Number of moles = mass/molar mass
Number of moles = 12.87 g/ 34.83 /mol
Number of moles = 0.37 mol
now we will compare the moles of lithium nitride with lithium hydroxide.
Li₃N : LiOH
1 : 3
0.37 : 3/1×0.37 = 1.11 mol
Mass of LiOH:
Mass = number of moles × molar mass
Mass = 1.11 mol × 23.95 g/mol
Mass = 26.58 g
Please help-- 15 pts!
What kind of liquid will have the highest vapor pressure value?
a liquid with weak intermolecular forces and a low temperature
a liquid with weak intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a low temperature
Happy Holidays!!
Answer:
a liquid with weak intermolecular forces and a high temperature
Explanation:
According to encyclopedia Britannica, "Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid."
This implies that the vapour pressure of a liquid tends to increase as the temperature of the liquid increases. Recall that vapour pressure also depends on the magnitude of intermolecular forces. The greater the magnitude of intermolecular forces, the lower the vapour pressure hence water has very much higher vapour pressure than ethane.
Answer:
A liquid with weak intermolecular forces and a high temperature
Explanation:
I just took the test and got it right
how many molecules of H3PO4 are in 125 g of H3PO4
Answer:
2.11 * 10^3 molecules of phosphoric acid
Explanation:
The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?
*Atomic radii decrease from left to right across a period and decrease from top to
bottom in a group.
*Atomic radii increase from left to right across a period and increase from top to
bottom in a group.
*Atomic radii decrease from left to right across a period and increase from top to
bottom in a group.
*Atomic radii increase from left to right across a period and decrease from top to
Wottom in a group.
Answer:
The answer is: Atomic radii decreases from left to right across a period and increases from top to bottom in a group.
Explanation:
How does heat from the sun turn liquid water into gas called water vapor?
Answer:
Explanation:Once energy is added to water by heat from the sun, the bonds between the water molecules gain kinetic energy or energy in motion. Then they escape the surface of the liquid and become a gas (water vapor), which rises into atmosphere.
how many molecules of water are found in 1.5mol of water ?
Answer:
9.033×10^23 Molecules
Explanation:
We are given,
No.of moles of water = 1.5 moles
The approximate value of Avagadro's Constant =6.022×10^23 particles
Hence,
As we know that,
No.of particles = No.of moles × Avagadro's Constant
Here,
No. Of Water Molecules in 1.5 moles of water = 1.5×6.022×10^23
No.of Water Molecules in 1.5 molesof water=9.033×10^23 Molecules
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Lesson 4.07
Question 9 options:
True
False
Answer:
that is a false sentence
Answer:
I'm sure you've already finished the est but the real answer is true, I took the k12 test and got that one correct, hope this helps anyone!
Explanation:
PLS HELP ASAP I DONT KNOW WHAT TO WRITE AND I ONLY HAVE 6 MINUTES HELPP
Answer:
In all of the ecoregions, wind and rain can weather and erode the landforms and soil. Rivers are also
powerful weathering and erosion agents. They can cut into rock and form canyons. When rivers deposit
eroded material, they change their shape or extend the shoreline. When waves along coastlines deposit
sediment, they extend beaches; when they wash sediment away, the waves erode beaches. Rivers, rock
formations, soils, topography, and precipitation in an ecoregion will determine how the processes of
weathering, erosion, and deposition work to reshape it.
Explanation:
Can someone answer this for me?
Answer: The moles of nitrogen dioxide produced are 96.3
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}=\frac{3714L}{22.4L}=165.8moles[/tex]
[tex]4NH_3(g)+7O_2(g)\rightarrow 4NO_2(g)+6H_2O(g)[/tex]
According to stoichiometry:
7 moles of oxygen [tex](O_2)[/tex] produce = 4 moles of nitrogen dioxide [tex](NO_2)[/tex]
Thus 168.5 moles of oxygen [tex](O_2)[/tex] will produce = [tex]\frac{4}{7}\times 168.5=96.3[/tex] moles of nitrogen dioxide [tex](NO_2)[/tex]
(4.2 x 10^8) + (2.6 x 10^6) *
Answer:
4.226×10^8
Explanation:
4.2 ×10^8+2.6×10^6=422600000
or 4.226×10^8
Which is a better estimate for the volume of a fish bowl?.
1 gallon
1 cup
Answer: 1 gallon
Explanation:
Answer:
1 gallon
Explanation:
because gallons are constisting of cups and 1 cup wont be enough for a fish to swim
Can someone help me
Answer:
The longer it takes to orbit the sun.
Explanation:
Help me plz I don’t know what it’s mean
Answer:
1 has the highest density because it has the most amount of circles in the least amount of space- it is the most densely filled with circles; it is the most dense.
Answer:
image 1 would have the highest density
Explanation:
the closer the molecules are the more solid an object is. if the molecules are far apart and rarely bump into eachother, it is more gaseous. the object in the middle (2) is a liquid
5.Summarize Which of the following is not an
advantage of using SI units?
A allows scientists to compare observations
and results
B can compare measurements made years
apart
C based on the number 5, which is easy to use
in calculations
D uses prefixes to express measurements that
are small or large
Answer:
C based on the number 5, which is easy to use in calculations
Explanation:
The SI unit system is not based on the number 5.
If there are 5 protons, how many electrons does the atom have?
If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
What is proton ?The term proton is defined as a subatomic particle found in the nucleus of every atom. Its mass is slightly less than that of a neutron and 1,836 times the mass of an electron.
The protons are considered as elementary particles. The protons are called to be composite particles, containing three valence quarks, and together with neutrons are now classified as hadrons.
Boron has an atomic number of 5. In which it has 5 protons. Therefore, the atom also has 5 electrons. Its atomic mass is 10.811. Thus, it has 11 total particles in its nucleus i.e., protons and neutrons.
Thus,If there are 5 protons, there should be 5 electrons as well. Boron as an electron configuration of 2-3 or 1s2 2s2 2p.
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What would you see if you were standing on the Earth's surface in the penumbra and you were looking up at the sky?
Answer:
clouds?
Explanation:
im sorry i just wanted the 23 points
what is meant by polimer
Answer:
i don't knoblol
Explanation:
i don't know lol
Answer:
a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon. a compound formed from two or more polymeric compounds.
Explanation:
HOPE IT HELPS YOU:))