Answer:
The atoms of different elements vary in size and mass.
Explanation:
Excited hydrogen atoms emit light in the ultraviolet at 2.47x1015Hz. What is the
energy of a single photon with this frequency?
The energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
Using Planck's equation, the energy of the photon E = hf where h = Planck's constant = 6.63 × 10⁻³⁴ Js and f = frequency of ultraviolet light = 2.47 × 10⁻¹⁵ Hz.
Substituting the values of the variables into the equation, we have
E = hf
E = 6.63 × 10⁻³⁴ Js × 2.47 × 10¹⁵ Hz.
E = 16.3761 × 10⁻¹⁹ J
E = 1.63761 × 10⁻¹⁸ J
E ≅ 1.638 × 10⁻¹⁸ J
So, the energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
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BALANCED WORD EQUATION Aluminium carbonate + hydrochloric acid -->
Answer: 2Al+6HCl→2AlCl3+3H22Al+6HCl → 2AlCl3 + 3H2
Explanation:
Which statement best describes the difference between a substance with a pH of 2.0 versus a substance with a pH of 4.0?
a
(1 point)
O The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.
o The substance with a pH of 4.0 would have 100 times as many hydrogen ions per volume of water.
O The substance with a pH of 4.0 would have twice as many hydrogen ions per volume of water.
O The substance with a pH of 2.0 would have twice as many hydrogen ions per volume of water.
Answer:
The answer is the first one.
Explanation:
The lower a pH level the higher the the number hydrogen ions present in the acid's container.
ph = - log(H)
4 = - log(H)
- 4 = log(h)
10^-4 = H+
1 * 10^-4 = H +
ph = - log(H)
ph = 2
- 2 = log(H)
10^-2 = H
1*10^-2 = h
Something the power - 2 is 100 times greater than something with the power of -4
Answer:
the guy above is correct
Explanation:
EASY QUESTION (PLEASE HELP THE INTERNET ISN'T SUCH A BIG HELP RIGHT NOW)
Things microscopes have helped scientists discover about cells.
Answer:
Again, Microscopes discovered a lot of things in biology like the prokaryotic cells, Bacteria and Archaea, aswell as parts of an organelle/cell.
Which of the following shows a valid combustion reaction?
2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH
Combustion reaction means two common products
CO_2H_2OOption B is correct
[tex]\\ \sf\longmapsto C_2H_4+O_2\longrightarrow 2CO_2+2H_2O[/tex]
Rocks and fossils leave evidence of the conditions that were present when they formed.
true of false
Regina found an accelerant at the crime scene. What did she MOST likely find?
A.
a stash of unused bullets
B.
a bottle of luminol
C.
a container of gasoline
D.
a soda can filled with ashes
Answer:
c
Explanation:
mostly it used in movies in the crime scence
Accelerants are flammable solvents such as kerosine, turpentine, gasoline etc. Therefore, the accelerant obtained from the crime scene here, is gasoline.
What are accelerants?Accelerants are substances that can combine, blending, or disturb another substance, causing the speed of a natural or artificial chemical process to increase. Accelerants are important in chemistry because they can speed up most chemical reactions.
Accelerants change a chemical bond, accelerate a chemical process, or restore organisms to homeostasis. Accelerants are not always catalysts because they can be consumed by the process.
Flammable gases or solvents such as gasoline, diesel, butane gas, kerosine, turpentine etc are examples of accelerants. Therefore, among the given substances , gasoline is the accelerant.
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Calculate the molar mass of carbon tetrachloride, CCl4.
chemical properties of sodium
Answer:
Density 0.97 g.cm -3 at 20 °C
Melting point 97.5 °C
Boiling point 883 °C
oxidation states +1, −1 (rare)
Explanation:
Have a nice day
which of the following is most acidic oxide?
a.Na2O
b.Al2O3
c.P2O5
d.SO3
And why it is most acidic oxide?
-i effect required here
Let's see which oxide shows more -i effect
Na-Group 1 Al-Group 15P-Group 15S -Group 16P lies below Al
And -i effect increases down the group so acidity increases
P_2O_5 is more acidicWhich of these describes an exothermic reaction? Please help, today is the last day to submit anything.
Answer:
A, Heat is released as the reaction happens.
Explanation:
Exothermic reactions release heat and/or light and is a reaction in which the overall enthalpy is negative. The one your mouse is hovering over explains Nuclear Fission. The third one explains an endothermic reaction, as heat is absorbed in the reaction. The product being cold is actually one of the key characteristics of an endothermic reaction. Two liquids being mixed that forms a solid is called a precipitate.
Compare the box on the left containing the reactants in a chemical reactions. Which box on the right is the correctly represents the products according to the Law of Conservation of mass?
A) A.
B) B.
C) C.
D) D.
Answer:
d is the right answer
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JWhat type of evidence is gathering information through your senses or using scientific tools?
Predictions
Results
Scientific research
Observations
I need uses of acid-base indicators
Answer:
to indicate the presence of acid or base in a body
Wines are produced from fermentation of crushed grapes. What causes the either white or red color of wine
Answer:
The cause of the color "white" in wine is because the grape's skin is removed before fermentation.
The cause of the color "red" in wine is because the grape's skin is still intact while fermentation
What allows us see the color green?
A
The green wavelength is absorbed.
B
The green wavelength is reflected.
C
All colors but green are reflected back.
D
The green wavelength vibrates the air particles.
Answer:
When (B) the green wavelength is reflected, we are able to see green.
I hope this helped at all.
In an electromagnetic spectrum, complimentary colors are absorbed and reflected , the color which is visible is the reflected color, hence the green wavelength is reflected which enables to see the color green.
What is electromagnetic spectrum?The electromagnetic spectrum consists of electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.
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• Describe evidence that convection cycles/cells exist within the Earth's core and how they connect to
sea floor spreading and subductio zones
Explanation:
Seafloor spreading and other tectonic activity processes are the result of mantle convection .Mantle conversion is the slow churning motion of Earth’s mantle convection carry heat from the lower mantle and core to lithosphere
If, it helps you than mark me as brainlistConvert 4.0 moles of krypton into liters of krypton.
Answer:
4.0 moles of krypton converts to 89.6L.
Explanation:
To convert moles to liters, remember that at standard temperature and pressure (STP), 1 mole is equal to 22.4 liters. Multiply your mole value - in this case, 4.0 - by the molar volume constant, 22.4L, to convert moles into liters. 4.0 x 22.4 is equal to 89.6, thus your answer is 89.6L.
We can check this by dividing 89.6 by 4.0, which will give us the molar volume constant 22.4L, proving that this answer is correct.
What happens when you drop an egg on the ground from about 6 ft high?
Answer:
Gravity causes an object to fall to Earth when dropped. When the egg hits the ground with a given force, the ground exerts the same force back on the egg. If too large a force is delivered to the egg shell, the egg will crack.
Explanation:
do you think organisms who live in the artic would survive in the desert? Do you think organisms in the desert would survive in the artic? Why or why not?
Answer:
I'd say probably not
Explanation:
Organisms have evolved to survive and thrive in particular environmental conditions, specifically focusing on food supply, temperature, terrain, etc.. Therefore, desert animals would not be equipped with the insulation to survive in cold climates like the artic, and would freeze to death, and artic animals would most likely die from heat exhaustion in the desert. Additionally, fish, which is a main food source for articles animals, are not available in the desert, and it's the same case for desert animals in the artic. Finally, those organisms' enzymes and proteins, which make up their being and are the reason they can function, are only optimal in the temperature range in which they normally live; therefore, switching to such drastically different climate would result in their enzymes denaturing and their cell and eventual organism death.
Scientists theorize that the original point of matter from which our universe formed was smaller than a dime. This matter would also have:
a. had unimaginable mass
b. been incredibly dense
c. had unimaginable potential energy
d. all of the above
ANSWER:
B. been incredibly dense? I'm not sure sorry
What is the density of a 36 g object with a volume of 15 cm3? (Density: D = ) 0. 42 g/cm3 0. 54 g/cm3 2. 4 g/cm3 5. 4 g/cm3.
Answer:
2.4 g/cm3 is the correct answer.
Explanation:
Hope this helps
How much mass does 1 mol of O2 gas have?
Answer: 15.99 x2g
Explanation:
How does the bear help Atalanta?
Select 3 correct answer(s)
Question 2 options:
The bear brings Atalanta to shelter.
The bear guards and protects Atalanta.
The bear brings Atalanta food.
The bear teaches Atalanta to hunt.
What are the four groups of carbon compounds found in living things?
1. How much energy is required to heat 32.5g of water from 34°C to 75°C?
Answer:
5.850 kJ (of heat energy)
Explanation:
What we need:
[] The mass of the material = m = 32.5g
[] The temperature change that occurs = ΔT = 43
() 75 - 34 = 43
[] The specific heat capacity of the material = c
() This is the amount of heat required to raise 1 gram of that substance by 1°C
() For water, this is 4.186Jg°C
The equation to use:
Q = m * c * ΔT
Q = 32.5 * 4.186 * 43
Q = 5849.935 J
Q = 5.850 kJ
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
Answer:
[tex]\boxed {\boxed {\sf 5569.85 \ Joules}}[/tex]
Explanation:
We are asked to find how much energy is required to heat a sample of water.
We will use the following equation:
[tex]q= mc \Delta T[/tex]
The mass of the water is 32.5 grams. The specific heat capacity of water is 4.18 Joules per gram degree Celsius.
The change in temperature is the difference between the final temperature and the initial temperature. The water's temperature is raised from 34 degrees Celsius to 75 degrees Celsius.
ΔT= final temp - inital tempΔT = 75 °C - 34 °C = 41 °CNow we know all three variables:
m= 32.5 g c= 4.18 J/g °C ΔT = 41 °CSubstitute the values into the formula.
[tex]q= (32.5 \ g)(4.18 \ J/g \textdegree C)(41 \ \textdegree C)[/tex]
Multiply the first 2 numbers together. The units of grams cancel.
[tex]q= 135.85 \ \ J/ \textdegree C(41 \ \textdegree C)[/tex]
Multiply again. This time, the units of degrees Celsius cancel.
[tex]q= 5569.85 \ J[/tex]
5,569.85 Joules of energy are required.
Charlotte has some copper sulfate solution. She wants solid copper sulfate. Which technique should she use?
Answer:
She should use the crystalization technique
Explanation:
First, the copper sulfate solution should be filtered to clear any impurities.
By heating the solution of copper sulfate on a china dish, the excess water in the solution evaporates and leaves behind a saturated solution of copper sulfate.
Upon cooling this saturated copper sulfate solution, crystals of solid copper sulfate will be formed on the china dish.
In solid form, copper sulfate appears in triclinic-shaped crystals.
What is friction? A _______ between an object and the _______ it's moving over.
Answer:
A force between an object and the surface it's moving over.
Explanation:
hope this helps. . . <3
good luck! uωu
Balance this equation: _____ C3H8 + _____ O2 --> energy + _____ CO2 + _____ H2O
There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. The final equation will be C3H8 + 502 ----> 3CO2 + 4H20.
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What do we call the things we see around us? *
15 points
a. ecosystem
b. environment
c. matter
d. density
:::: Answer ::::
C. matter