Answer:
i wish i know
Explanation:
There have been made 2 attempts of oxygen production by potassium permanganate.In the first attempt they have got 75ml oxygen in 3 minutes whearas there have been got 100ml in 5 minutes by the 2nd attempt.In what case the speed of the oxygen production is bigger???
Pls explain your answer
Answer:
The speed of oxygen production is bigger in the first attempt.
Explanation:
In the first attempt, since 75ml oxygen is produced in 3 minutes, the rate of oxygen production is r = volume of oxygen/time = 75 ml/3 min = 25 ml//min
In the second attempt, since 100ml oxygen is produced in 5 minutes, the rate of oxygen production is r' = volume of oxygen/time = 100 ml/5 min = 20 ml//min
Since r = 25 ml/min > r' = 20 ml/min, the speed of oxygen production is bigger in the first attempt.
Enter the correct 4 digit code (no spaces)
What is the total amount of heat energy, in
joules, absorbed by 25.0 grams of water when the
temperature of the water increases from 24.0°C to
36.0°C?
Answer:
0.84
Explanation:
total heat energy =mass ×specific heat capacity (4.2kJ)×temp change
mass=25g convert to kg to get 0.025
specific heat capacity is 4.2
temp change=36.0-24.0=8.0
q = mC∆T
m=25.0
c=24.0
ΔT=36.0
25.0 * 24.0 * 36.0 = 21,600 jules
The equation q = MC ∆ T, where m is the sample mass, c is the specific heat, and ΔT is the temperature change, can be used to determine the amount of heat acquired or lost by a sample (q).
How can you figure out how much energy was consumed?
This is simple to perform; to calculate the amount of heat absorbed, multiply the substance's heat capacity by its mass and the temperature change.
The specific heat capacity of a substance is the amount of energy needed to raise the temperature of 1 gram of that substance by 1 degree Celsius. With a value of 4.18 J/g/°C, water has one of the highest heat capacities.
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why sometimes the electrons of an atom transfer to higher energy level
Answer:
According to Bohr, the amount of energy needed to move an electron from one zone to another is a fixed, finite amount. ... The electron with its extra packet of energy becomes excited, and promptly moves out of its lower energy level and takes up a position in a higher energy level. This situation is unstable, however.
If the spring constant is 12.6N/m and a spring is stretched by 0.25m, how much force has been applied?
Answer:
3.15N
Explanation:
We use this equation:
F= k∆x
Where ∆x refers to the amount or stretch or compression and k is the spring constant.
F = force
k = spring constant
∆x = change in length of spring
To find the value of F:
F= k∆x
F= 12.6x0.25
F= 3.15N
Calculate the average atomic mass for an imaginary element "E" that has the following isotope abundances:
56.67 % E-102.658 amu
43.33% E-104.770 amu
Answer:
Average atomic mass of E = 103.57 amu
Explanation:
Given data:
Average atomic mass of E = ?
Abundance of E-102.658 = 56.67%
Abundance of E-104.770 = 43.33%
Solution:
Average atomic mass of E = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass of E = (56.67×102.658)+(43.33×104.770) /100
Average atomic mass of E = 5817.63 + 4539.68 / 100
Average atomic mass of E = 10357.31 / 100
Average atomic mass of E = 103.57 amu.
If a 6N weight is hung on a spring, and it extends by 0.2m, what is the spring constant (k)? What do you think the units are?
Answer:
K = 30N/m
Explanation:
We use this equation:
F= k∆x
Where ∆x refers to the amount or stretch or compression and k is the spring constant.
F = force
k = spring constant
∆x = change in length of spring
We don't know the value of k, so we make k the subject:
k = F/∆x
k = 6N x 0.2m
k = 30N/m
Explain why chlorine (Cl2) is a gas at room temperature,
but sodium chloride (NaCl) is a solid at room
temperature.
Include description of the bonding and structure of chloride and sodium chloride in your answer
Answer:
The melting/boiling point of a substance determines what state of matter it takes at a certain temperature.
In Cl2 there are covalent bonds between the atoms forming simple molecules. There are weak attractions between molecules of Cl2 meaning little energy is needed to break these forces of attraction and therefore Cl2 has a low boiling point.
NaCl on the other hand has strong electrostatic forces of attraction between the positvely charged Na ion and the negatively charged Cl ion. NaCl forms a giant ionic lattice that requires high amounts of energy to break and therefore has a high melting point.
I need help...................
Please answer this question please brianlest
Answer:
ok, maybe draw like a few plants and dear, you know and draw them out of cells, like the shape. so like a bunch of cells together making the shape of a deer or plant and stuff. i hope this helps
Explanation:
HELP HELP HELP HELP HELP
In order to properly measure the displacement, the object must be completely submerged, however in the diagram the wood is floating. So the measured displacement will only be a fraction of what it actually is.
 Can anybody help it 8th grade science about the sun
Answer:
The sun is at the (edge) of our solar system
and is much (hotter) than anything else in the solar system (95%) of the entire mass of the solar system is contain in the sun
Why can single bonds rotate freely?
Name the type of chemical reaction.
NaBr + H3PO4 → Na3PO4 + HBr
Answer:
double displacement (metathesis) hope that helps!(^_^メ)
Explanation:
meh.
How many Joules of heat are required to melt 250 grams of ice at 0°C?
AHfus = 334 J/g
AHvap = 2258 J/g
Cp= 4.184 J/g C
Heat required : Q = 83500 J = 83.5 kJ
Further explanationGiven
mass ice = 250 g at 0°C
Required
The heat required
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Lf=latent heat of fusion
Input the value :
Q = 250 g x 334 J/g
Q = 83500 J
how many moles are in 4.38 of AgNO2
Answer: 0.02 moles
Explanation:
The number of moles in 4.38 g of AgNO₂ is equal to 0.028 mol.
What is a mole?A mole can be described as a standard unit that can be utilized to calculate a given number of particles. The constituents counted are usually individually distinct but identical entities.
A mole of the substance can be used to calculate quantities of atoms, molecules, ions, or other particular particles. The quantity of matter can be described as measured by elementary entities.
The number of constituents present in one mole is equal to 6.023× 10 ²³ which is known as Avogadro’s constant.
Given, the mass of AgNO₂ = 4.38 g
The mass of one mole of AgNO₂ = 153.87 g
The number of moles of in 4.38 g of AgNO₂ = 4.38/153.87 = 0.028 mol
Therefore, the number of moles of AgNO₂ is equal to 0.028 mol.
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What is the mole ratio of water (H20) to phosphoric acid (H3PO4)?
P.010 + H2O 4H3PO4
Before
After
Р
4
(4) - 4
4(4) - 16
O 10+1
H
2
3(4) - 12
1:1
46
6:4
2:2
Answer:
the answer to this problem is before
Explanation:
Which describes an example of ecological succession?
Answer:
b. a meadow replacing a pond in it's flood plain
Explanation:
I'ts a secondary succession.
Although I am in the middle of the 5 stages, I am just as important
as the first and the last. As soon as you see a leaf sprout, you are
sure to be in my stage. Who am I?
This is annoying
Answer: The final stage of the life cycle of a tree is when it has fully grown and reached the ... You should be confident in your supplier's approach to sustainability. ... This is the first occasion you will see a stem and perhaps a couple of leaves. ... The next phase is the sapling stage, this is when the sprout continues to grow and has ...
Explanation:
Why is much of the ocean floor so difficult to see?
Answer:
because ocean currents deposit sediment on the ocean floor.
A sample of nitrogen gas contains 8.23 x 10^23 molecules. What is the volume of this sample at STP?
Please show and explain the steps.
Answer:
30.6 L
Explanation:
Given data:
Number of molecules of nitrogen = 8.23×10²³ molecules
Volume occupy at STP = ?
Solution:
Standard temperature = 273.15 K
Standard pressure = 1 atm
One mole of any substance at STP occupy 22.4 L volume.
Number of moles of nitrogen:
1 mole contain 6.022×10²³ molecules.
8.23×10²³ molecules × 1mol / 6.022×10²³ molecules
1.37 mol
Volume of nitrogen:
1.37 mol × 22.4 L / 1 mol
30.6 L
why is digital better then analog music
Once a digital recording is made, the bandwidth is set in place. An analog recording is considered unlimited. Therefore, it can move to a higher and higher resolution without losing its original quality.
Wastewater filtration
Pros and cons of secondary water filtration?
Which of the following best describes the movement of particles in a solid?
O A. Particles can vibrate slightly, but are unable to move around.
O B. Particles move past each other freely.
O C. Particles travel at high speeds in all directions.
O D. Particles travel at low speeds in all directions.
Answer:
A
Explanation:
particles are frozen and hence will vibrate in their fixed positions
How would a flood impact an ecosystem?
Loss of life
Displacing organisms' habitats
Polluting bodies of water as the floodwater recedes
All answers are correct
UPDATE: Just took the quiz the answer is D. All of them.
Answer:
all of them
Explanation:
took test
Floods can cause soil erosion and sedimentation. It will destroy all the properties of human beings. All the options are correct. Thus the correct option is D.
What is Flood?Flood is defined as a natural disaster which results from the overflow of water on land. It is mainly generated by the heavy rainfall, sudden snow melt, etc. It affect the ecosystem adversely.
The floods are mostly affected to the coastal regions. It is even a threat to life of people. The habitat of aquatic organisms are destructed by the floods. The ground water is found to be contaminated with pathogenic microbes and causes water borne diseases.
As a result of floods the life of small insects which play a primary role in the ecosystem of food chain is also affected. All fields like education, communication, transport, etc. of our state is affected by the floods.
The floods can cause loss of people, low water quality, destruction of habitats. Some times the effect of flood in our life will be long lasting.
Thus the correct option is D.
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What is the oxidation number for Ba?
A. +1
B. -2
C. +2
D. -1
Answer:
+2
Explanation:
Ba is present in group 2 and group 2 show + oxidation state
3. Why have we not been able to create a fusion reactor on Earth?
Answer:
We are not able to create a fusion reactor on Earth because fusion energy production is not based on a chain reaction, as is fission. Plasma must be kept at very high temperatures with the support of external heating systems and confined by an external magnetic field.
Explanation:
can the element calcium be found in more than one state of matter?
Answer:
No
Explanation:
The element calcium be found in more than one state of matter ( Only in Solid state )
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which factor is abiotic A.)water B.) a plant c.) animal
Answer:
answer is A.) Water
Answer:
a) water
have a good day!
WILL GIVE BRAINLIEST!!
A magnetic globe is being held down on a base. When released, the globe rises above the base and eventually comes to rest floating above the base.
In which position shown does the globe have the greatest magnetic potential energy?
Answer:
It is position 3
Explanation:
Because the further the magnets are the higher the potential energy, and in position 3 the globe is the furthest from the base meaning that in base 3 the magnetic potential energy is the highest or greatest there.
