The initial temperature of water is 47.8⁰C
In this case, the challenge is to determine how much heat is required to bring a particular sample of water from its original temperature to its boiling point.Given,
mass of water is 2450g
absorbed heat is 5.35×105 J
we have to find out initial temperature
First Calculate the change in temperature when 5.35×10^5 J of heat is provided to 2450g of water.
q = m . c . ∆T
q is amount of heat gained
m is the mass of water
c is the specific heat of the substance
∆T is change in temperature
Specific heat of water is 4.18 J/g⁰C
∆T = q / m . c
= 5.35×10^5 / 2450 × 4.18
= 52.2⁰C
Now we know that the final temperature of the water is
100⁰C and that this final temperature is 52.2⁰C
is higher than the initial temperature of the water.
So by, ∆T = T(f) - T(i)
T(i) = T(f) - ∆T
T(i) = 100⁰C - 52.2⁰C
= 47.8⁰C
Therefore, initial temperature of water is 47.8⁰C
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2. Calculate the wavelength in nm of a photon with an energy of 2.57 x 10-19 J.
The calculated energy is 3.97×10⁻²¹J
A single photon has an energy of hv or = (h/2), where h is the Planck constant of 6.626 x 10-34 Joule-sec. If the photon's frequency is known, we may apply the formula E = h f to determine a photon's energy. The equation E = h c can be used to determine a photon's energy if its wavelength is known.
The photon has a 3.97 1021 J energy.
E=hf, with
Planck's constant is h, and the photon's frequency is f.
The second equation is f=c, where c is the speed of light and is the photon's wavelength.
F=c, so we can write
E=hcλ
=6.626×10⁻³⁴J⋅s×2.998×10⁸m⋅s⁻¹/5.00×10⁴×10⁻⁹
=3.97×10⁻²¹J
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I need help right now please
Answer:
Explanation:
It is A because the electrice flows through the cord to give energy for the blades to move.
6. 2074 Old Q.No. 20 2072 Q.No. 20 What is normality? How can you prepare sodium carbonate in 250 ml? 10 solution of sodium carbonate in 250 ml?
Answer: what is normality =
As per the standard definition, normality is described as the number of gram or mole equivalents of solute present in one liter of a solution. When we say equivalent, it is the number of moles of reactive units in a compound.
How can you prepare sodium carbonate in 250 ml?
Procedure
Take a watch glass, wash it with distilled water and dry it.
Weigh the exact amount of clean and dried watch glass and record its weight in the notebook.
Weigh correctly on the watch glass with 1.325 g of sodium carbonate and record this weight in the notebook.
Using a funnel, transfer sodium carbonate softly and carefully from the watch glass into a clean and dry measuring flask.
Wash the watch glass with distilled water to move the particles that stick to it into the foam with the assistance of a wash bottle.
For this purpose, the volume of distilled water should not exceed 50 ml.
Wash funnels several times with distilled water to move the sticking particles into the measuring flask using a wash bottle. Add water in tiny quantities while washing the funnel. The distilled water quantity used for this purpose should not exceed 50 mL.
Using a wash bottle, wash the funnel carefully with distilled water to pass the solution attached to the funnel into the measuring flask
Turn the flask of measurement until the sodium carbonate dissolves.
Using a wash bottle, thoroughly add enough distilled water to the measuring flask just below the etched mark on it.
Add the last few mL of distilled water drop into the measuring flask until the reduced meniscus level just touches the mark.
Put the stopper on the mouth of the flask and shake softly to make the entire solution uniform. Calculate it as a solution of sodium carbonate N/10.
10 solutions of sodium carbonate in 250 ml?
Normally in the laboratory, we are required to prepare 250 ml of solution. Therefore, to prepare 250 ml of \frac{M}{10} Na2CO3 solution, \frac{10.6}{4} = 2.650 g of sodium carbonate are dissolved in lesser quantity of water and the solution is diluted to exactly 250 ml
Explanation:
What is the name of this lab equipment
The name of the lab equipment is bunsen burner.
What is a bunsen burner?A bunsen burner is a piece of equipment found in many laboratories primarily used for the controlled burning of flammable gas in the air.
In the laboratory, the bunsen burner is used as a source of heating for reactions. The gas-air mixture can be controlled to determine the level of flame and heat that will be produced.
Bunsen burners can vary in structure depending on the maker. The gas supply can be any of butane, propane, etc.
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Choose your favorite element. Complete the blank periodic table entry for that element to the left. Research your element and write one interesting fact you discovered below
CAN YOU HELP ME, PLESE RIGHT NOW
Sodium is a metal that belongs to group 1 of the periodic table.
What is my favorite element?My favorite element is sodium. Sodium is found in group one of the periodic table. The element is univalent and also forms univalent positive ions. Like every other metal, sodium is able to react with dilute acids to liberate hydrogen gas.
Sodium is a light metal and is known to react with mercury to form the sodium mercury amalgam which is obtained during the electrolysis of sodium chloride. All of the compounds that are formed by sodium are ionic in nature. However the hydrides of sodium are unstable.
Sodium is highly reactive thus it must not be exposed to air since it could ignite spontaneously in air. As such, sodium must be stored under paraffin oil. All the compounds of sodium are ionic in nature.
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how many elements are in 3caso4
Answer:
there are only three elements in 3CaSO4: calcium, sulfur and oxygen
Would a reaction occur if a piece of metallic Sn were placed in distilled water with a piece of
metallic Zn?
Yes, a reaction will occur if a piece of metallic tin(Sn) is placed with a piece of metallic Zn(Zinc).
To establish whether a reaction will take place or not, we use the reactivity series of metals.
The reactivity series of some metals is given in the adjoining image.
In this series, a higher placed element will react with a lower placed element.
As we can see from the series zinc is at a higher level as compared to tin, therefore it will react with tin.
Thus, a reaction will occur if a piece of metallic tin(Sn) is placed with a piece of metallic Zn(Zinc).
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how to separate bean from mixture without picking them out one by one
What temperature does Sulfur freeze at
Answer:
115.21 degrees Celsius
the amount of hydrogen that would be produced by dropping 2.5 grams of zinc in 100 mL of sulfuric acid solution with the same concentration
In sulfuric acid solution it is produced from sulphur, oxygen and water and the amount of hydrogen is 0.038 mol
Here given data is zinc = 2.5 gram in 100 mL of sulfuric acid means H₂SO₄ solution
Then the reaction is
Zn + H₂SO₄ → ZnSO₄ + H₂
1 mol of Zn has mass = 65.39 g
The amount of Zn is 2.5 gram/ 65.39 g/mol
Zn = 0.038 mol
The amount of H₂ is same as amount of Zn consumed is 0.038 mol
Therefore, the amount of hydrogen produced 0.038 mol
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What does it mean for an atom to be stable?
Answer:
if the forces among the particles that makeup the nucleus are balanced, it is stable. Stable atoms retain their form indefinitely, while unstable atoms undergo radioactive decay. Most naturally occurring atoms ate stable and do not decay. A stable atom has a net charge of 0. In other words, It has an equal number of protons and electrons.
Calcium chloride (a solid ionic salt formed from a group 2A metal and group 7A Halogen) is dissolved into a water solvent. Can the calcium chloride be separated from the solution, and will it retain its properties?
a
No, it cannot be separated through any means. It does not retain its original properties.
b
Yes, it can be separated through evaporation. It does not retain its original properties.
c
No, it cannot be separated through any means. It retains its original properties.
d
Yes, it can be separated through evaporation. It retains its original properties.
Answer:
Yes, it can be separated through evaporation. It retains its original properties.
Explanation:
Convert the following numbers
540,000
The result in binary would be 10000011110101100000.
By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. A binary number is made up of two 0s and 1s. Two is used as the base representation for binary numerals. As an illustration, (101)2 (101) 2. Switches can be used to encode and store numbers in binary form. This system is compatible with a variety of digital devices, including computers, calculators, digital TV decoder boxes, cell phones, burglar alarms, watches, and more. Binary values are kept in memory, which is essentially a collection of electronic on/off switches.
The complete question is- Convert 540000 to Binary form.
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Hello please help, thank you so much!
Answer:
7.) 126.7 cm³
8.) 789 g
Explanation:
7.) To find the volume (cm³) of alcohol, you need to multiply the given mass (g) by the density. The denisty ratio represents grams of the alcohol per every 1 cm³. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value with the least amount of sig figs (100.0 grams).
100.0 grams 1 cm³
--------------------- x --------------------------- = 126.7 cm³
0.78945 grams
8.) This time, you are given the volume instead of the mass. The same process can be used in this problem, but you first need to convert liters (L) to cm³ to be able to use the denisty ratio. Once you find the volume in cm³, you can multiply it by the density to find the mass. Again, be sure to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the given value with the least amount of sig figs (1.00 L).
1 L = 1,000 cm³
1.00 L 1,000 cm³ 0.78945 g
------------- x ------------------- x -------------------- = 789 g
1 L 1 cm³
B
1
2
3
4
5
sodium (Na)
boron (B)
O magnesium (Mg)
lithium (Li)
6
7
8
9
10
An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron
than beryllium. Which element is element X?
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Sodium has three shells while beryllium has two shells. Beryllium has one more valence electron compared to sodium.
Valence electron are the electrons present in outer most shell of the atom Atomic number of beryllium is 4 and its electronic distribution is 2,2. this indicates there are 2 electrons in outermost shell Atomic number of sodium is 11 and its electronic distribution is 2,8,1.This indicates there is 1 electron in outermost shell.Beryllium is found in period 2 of group 2 of the periodic table, which is also known as the alkaline earth metal group. Sodium is found in period 3 of group 1 of periodic table,also called alkaline earth metal group. Thus ,sodium has one less valence electron in outermost shell as compared to berylliumLearn more about valence electron here-
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Which of the following statements is TRUE?
A sodium (Na) atom has a larger radius than a potassium (K) atom.
A neon (Ne) atom has a smaller radius than an oxygen (O) atom.
A fluorine (F) atom has a smaller first ionization energy than oxygen (O) atom.
None of the statements are true.
pls explain the correct answer. i have to explain why its correct
Explanation:
hi I am not sure if you have any questions or concerns please visit the plug-in settings to try and you have any questions or concerns please visit
pls answer I I’ll give u brainliest
Answer:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
Explanation:
To model the relationship between these factors, you need to understand how they interact. A greater density of particles usually means they are moving slower, thus resulting in less energy and less heat consequentially. As temperature increases, particles will begin to move rapidly (increase motion) and have higher kinetic energy. Similarly, a lower temperature will lead to less motion and lower kinetic energy. Furthermore, their thermal expansion will be less and have a decrease in contraction, as they will be more compact and dense.
Therefore you could make a model such as:
low density -> high temperature -> increased particle motion -> high kinetic energy -> high thermal energy -> greater thermal expansion -> more contraction
How long will it take a car to accelerate from 30 m/s to 60 m/s, if it’s accelerating at 5 m/s 2
Answer:
6 metres per second squared
Explanation:
Gain in velocity = 60 - 30 = 30 m/s.
Time taken for this gain = 5 seconds
Average acceleration = 30 / 5 = 6 m/s/s.
So, 6 metres per second squared.
Over a hundred years ago, the prairies of South Dakota were home to dozens of kinds of grasses and hundreds of kinds of insects. This supported many populations of small mammals and birds. Today the prairies are dominated by domesticated wheat crops that humans can harvest and use for food. Pesticides used in growing the crops have killed off many kinds of insects that once lived there. In addition, the pesticides have poisoned populations of native mammals, such as prairie dogs. Which of these is most likely an additional change that has occurred in this ecosystem?
O A. Pesticides have been washed into local sources of drinking water.
OB. There has been an increase in the amount of space available to mammal populations.
OC. There has been an increase in the variety of food sources available to bird populations.
O D. Native grasses have adapted to become more edible to humans.
An additional damage of the pesticides is that they have been washed into local sources of drinking water.
What are pesticides?The pesticides are chemicals that could be used to prevent the growth of weeds on agricultural lands. We know that many of these pesticides have the ability to find their way into food grains and bioaccumulate in human systems.
These pesticides are equally able to poison the mammal populations that are in an area as well as to move along with surface water into the surrounding water bodies were they contaminate aquatic organisms.
Hence, an additional damage of the pesticides is that they have been washed into local sources of drinking water.
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What is the frequency of radiation whose wavelength is 0.81 nm?
Taking into account the definition of wavelength, frecuency and propagation speed, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
WavelengthWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
FrequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Porpagation speedThe propagation speed measures the speed at which the wave disturbance propagates along its displacement.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f× λ
All electromagnetic waves propagate in a vacuum at a constant speed of the speed of light.
Frequency in this caseIn this case, you know:
v= 3×10⁸ m/sf= ?λ= 0.86 nm= 0.86×10⁻⁹ m (being 1 nm= 1×10⁻⁹ m)Replacing in the definition of propagation speed:
3×10⁸ m/s= f× 0.86×10⁻⁹ m
Solving:
3×10⁸ m/s÷ 0.86×10⁻⁹ m= f
3.48×10¹⁷ Hz= f
In summary, the frequency of radiation whose wavelength is 0.81 nm is 3.48×10¹⁷ Hz.
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help please!
question 1: The electron configuration of an element is shown below.
1s22s22p63s1
Name the group this element belongs to in the periodic table and explain your answer.
Based on the electron configuration, write one chemical property of this element. (10 points)
Question 2: Define electronegativity.
A neutral atom has high electronegativity. Describe what happens to this atom during ionic bond formation. (10 points)
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital.
Based on the electronic configuration, the element is a reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form an anion during ionic bond formation.
What is electronic configuration of an element?The electronic configuration of an element is the arrangement of the electrons found in the atom of the element in shells or orbitals around the nucleus.
Electronic configuration arranges the electrons in the atom of the element in increasing order of energy level.
Considering the given element with the electronic configuration shown below:
electronic configuration of element = 1s²2s²2p⁶3s¹
The element belongs to group 1A of the periodic table because it has only one electron in its 3s orbital, the valence orbital.
Based on the electronic configuration, the element is a good reducing agent.
Electronegativity is the ability of an atom of an element to attract electrons to itself.
A neutral atom that has high electronegativity will gain electrons to form a negative ion or anion during ionic bond formation.
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how could you prove that dissolving table salt in water is a physical property, not a chemical change
Answer:
Dissolving a solid in liquid, such as table salt in water, is a physical change because only the state of the matter has changed. Physical changes can often be reversed. Allowing the water to evaporate will return the salt to a solid state.
What happens to the molecules that make up a as it is heated up in the oven?
(4.850 g - 2.34 g)/1.3 mL
Use
the periodic table to choose the element that matches each description.
halogen
group IIA:
A
nonreactive:
alkali metal:
DONE
Halogens are p-block elements, group IIA & alkali metal belongs to s-block and nonreactive elements are known as noble gases.
What is the periodic table?Chemical elements are listed on a periodic table according to their atomic number. Carbon and oxygen are two of the chemical elements listed in the periodic table.
What are the main features of the periodic table?The Periodic Table groups the elements according to their linked chemical and physical properties. The table consists of rows and columns. Vertical columns of the periodic chart represent groups. The table displays periods as horizontal rows.
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What is the atomic weight of gold ?
Answer:
the atomic weight of mass is 196.96657 u
A sample of pure zink has a mass of 4.50 g. Calculate its volume.
According to the given statement A sample of pure zinc has a mass of 4.50 g has a volume of 0.631 cm³.
What does "volume" mean?A three-dimensional object's volume, expressed in cubic units (as inches, quarts, or centimetres), is its cubic capacity. the volume that a material takes up in a given space.
What is the volume formula?As opposed to length, width, and height for a rectangular shape's area, the basic formula for volume is length, breadth, and height. The calculation is unaffected by how the different dimensions are referred to; for example, "depth" can be used in place of "height."
Calculation:Volume= Density/Mass
Mass = 4.50 g
Density = 7.13 g/cm³
Volume = ?
Volume = 4.50 g/7.13 g/cm³
Volume = 0.631 cm³
The zinc has a 0.631 cm³ volume.
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Which state of category of elements has the greatest number of elements? Least?
20 POINTS
A certain intermolecular force is created when a cation or an anion comes in contact with a neutral molecule that has dipole. What best explains the strength of this intermolecular force?
Strong, because it is a result of interactions between polar covalent molecules.
Strong, because it is a result of interaction between ions and polarized molecules.
Negligible, because it is a result of interactions between molecules with instantaneous dipoles.
Negligible, because it is a result of interactions between symmetrical molecules causing cancelling of dipoles.
The strength of this intermolecular force will be Strong, because it is a result of interaction between ions and polarized molecules.
This contact will produce a very powerful electric force.The force between two charged particles is known as the electric force. This power can either be alluring or repellent.Coulomb's law, which was determined from experimental data, governs the interaction between two stationary charged particles.According to Coulomb's law, the electric force between two point particles is inversely proportional to the square of the distance between them and is proportional to their charges. This force resembles Newton's gravitational force, which is likewise governed by the inverse-square rule, in many ways. But unlike gravitational force, which is always attracting, electric force may be both attractive and repulsive.To know more about electric force visit : https://brainly.com/question/2526815
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Choose the combination of factors that creates a thunderstorm
Relative Humidity
Low or high?
Air Temperature
Cold or warm?
Air Pressure
Low or high ?
Helpppp
Answer:
High humidity
Warm
High Pressure.
Answer:
Relative Humidity: high
Air Temperature: warm
Air Pressure: low