Answer:
(C) The oil floats on top of the water
Explanation:
If an object/substance is less dense than water it will float on the water.
If an object/substance has the same density as water it will stay submerged in the water, but will not sink to bottom.
If an object/substance is more dense than the water it will sink to the bottom.
A certain source emits radiation of wavelength 525 nm, What is the energy, in j.
Answer:
[tex]3.7837 \times {10}^{ - 19} j[/tex]
Explanation:
[tex]e = \frac{hc}{ \lambda} \\ where \: h \: = plancks \: constant \\ and \: c = speed \: of \: light[/tex]
Planck constant value: h = [tex]6.62606957 \times {10}^{ - 34} j \: s\: [/tex]
speed of light constant: c = [tex]299,792,458 \frac{m}{ s} [/tex]
[tex]hc = 6.62606957 \times {10}^{ - 34} j \: s\: \: \times \\ 299792458 = 1.98645 \times {10}^{ - 25} j \: m[/tex]
Divide the wavelength in nanometers by 10^9 to calculate the value in meters.
[tex] \frac{525}{ {10}^{9} } = 5.25 \times {10}^{ - 7} m[/tex]
[tex]e = \frac{hc}{ \lambda} \\ = \frac{1.98645 \times {10}^{ - 25} j \: m}{ 5.25 \times {10}^{ - 7} m} [/tex]
[tex] = 3.7837 \times {10}^{ - 19} j[/tex]
Which is greater: the number of atoms in one mole of calcium, or the number of molecules in one mole of carbon dioxide (CO2)?
The number of atoms in one mole of Calcium and one mole of Carbon Dioxide is the same.
How to know the number of atoms?The number of atoms is determined by Avogadro's number (a constant number that determines the atoms per mole).
Avogadro's number is equivalent to 6.02 x 10²³ atoms.
This means one mole of each element contains 6.02 x 10²³. However, this number of atoms changes according to the amount of the substances or moles.
How many atoms does 1 mole of Calcium and 1 mole of Carbon Dioxide contain?
Considering these are two different substances but the number of moles is the same (1 mole each) the number of atoms is equal to Avogadro's number or 6.02 x 10²³ atom.
Learn more about atoms in: https://brainly.com/question/13981855?referrer=searchResults
what is the mass in grams of 0.250 mol of the common antacid calcium carbonate?
Answer:That's 25.8 g of calcium carbonate In 100 g of the sample.
Explanation:
brainliest pls
Using evidence from the passage, explain how the population of moths changed after the Industrial Revolution began.
Answer:
After the pollution from the Industrial Revolution started affecting trees, most of the collected peppered moths were of the dark form. ... They were eaten by birds more and more, while the rare dark colored moths blended in better on the darker trees. This made the dark colored moths have a higher survival rate.Why is milk white? and there is no diffrent in various mamals?
Answer:
Milk is naturally a white substance due to the make-up of water and other components including fat and protein that mix together to form tiny particles which reflect light. There is a difference in mammals milk; for example, hippos milk is pink.
Explanation:
If you combine sodium(Na) and chlorine(Cl) to make sodium chloride how many atoms of each will you need? Explain
Answer:
I don't understand but I can tell u this:
Na has one extra valence electron and Cl has one missing one. Chemical reactions and forming of compounds is all in the electrons and not the nucleus. So, when highly reactive Na mixes with Cl, they form a stable compound called NaCl, or table salt.
If we are making one molecule of sodium chloride, we need one sodium atom and one chlorine atom. The formula of sodium chloride is NaCl.
What is sodium chloride?Sodium chloride is an ionic compound formed by the combination of sodium and chlorine atoms. One molecule of sodium chloride contains one sodium and one chlorine atom to form NaCl. Now if we are making one mole of NaCl, we need 6.022 × 10²³ atoms of each element.
Sodium is a metal and possess extra one electron in its valence shell. Chlorine have 7 valence electrons thus, it needs one more electron to attain octet. Sodium donates its electron to chlorine and gains a positive charge.
Chlorine gains a negative charge by accepting the electron from sodium. This opposite charge clouds undergo electrostatic force of attraction. And thus, it an ionic bond forms between them.
To find more on NaCl, refer here:
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Which of the following methods would be the best method for separating oil from water?
Major parts of the microscope that provides light to the microscope
Answer:
Explanation:
Illuminator. is the light source for a microscope, typically located in the base of the microscope. Most light microscopes use low voltage, halogen bulbs with continuous variable lighting control located within the base.
what will happen to the population of 0.01% of bacteria that are not killed by hand sanitizer and how does this relate to evolution
Answer:
the 0.01% of bacteria will reproduce. These new bacteria will have the same genes and communities that allowed their parent bacteria to survive. This shows survival of the fittest, where organisms that are best fit for their environment will survive and reproduce, in the process of evolution.
Explanation:
Have an upcoming test (that was leaked) and need to figure out Fluorine and astatine similarities please reply ASAP
Answer:
They both classify as halogens they are both in the fluorine family and their both in group 17 on the periodic table
Explanation:
That's all I could come up with
What kind of industrial facilities release Nitrous Oxide?
Answer:
the agriculture sector is an industrial facility that releases nitrous oxide
Explanation:
Answer: Hello!
Agriculture sector. The agriculture sector dominates emissions of N2O: emissions from agricultural soils in 2019 account for 55% of total UK emissions, and other agricultural sources add another 12%.
Explanation:
Feel Free to ask me anything if questions. Mark me brainest please. Hope I helped! Hope you make an 100%
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The limitation of Bohr's model is that electrons do not actually move in
Answer:
The Bohr atomic model did not make correct predictions of large- sized atoms and provided sufficient information only for smaller atoms.
Carmen has a sample of matter. It is clear and smells sour. The sample is also thick but it flows when poured.
Carmen has a sample of matter. It is clear and smells sour. The sample is also thick but it flows when poured.
Which is the best conclusion about Carmen’s sample?
It is a liquid because it is clear.
It is a liquid because it flows.
It is a solid because it is thick.
It is a solid because it smells sour.
Answer:
Explanation:
Answer:
Its a liquid cause it flows
Explanation:
think about it none of the others make sense ice is a solid and its clear
something like a wall can be thick but it doesn't flow
all of the atoms of the elements in group 4 have 4 valence electrons
True or false
Answer:
That is true
Explanation:
The group determines the valence electrons in the outer shell , the period determines the number of energy levels.
HELP PLEASE!! Ndnsjjsjsjeh
Answer:
I believe it is B.
Explanation:
because an element is a for sure pure substance and I am sure a compound is too. I appologize if I am wrong.
When compared to the standard hydrogen electrode, zinc has a reduction potential of -0.762 volts and copper a reduction potential of + 0.342 volts. What is the reduction potential when zinc and copper are connected to one another?
+0.420 volts
-0.420 volts
+1.104 volts
-1.104 volts
Answer:
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lava is a hot liquid rock. when lava flows over solid ground beneath it increases in temperature. what happens to the molecules in the solid ground when the temperature is increasing?
Answer:
Lava is hot liquid rock. When lava flows over solid ground, the solid ground beneath it increases in temperature. What happens to the molecules in the solid ground when the temperature is increasing? The energy of the molecules in the ground decreases.
9.56 x 105 cg is how many grams?
100 centigrams = 1 gram
Tính [H] và [OH] của dung dịch HC1 0,1M? Tính pH của dung dịch?
Answer:
po jakiemu to jest XD
Explanation:
po jakiemu to jest XD
1. Write a paragraph of 3 lines on how a rainbow form
Answer:
Explanation:
A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the Sun.
please help me
convert 12,800 ounces to kg.
I need a solved problem!
Is this statement true? “Are acids are aqueous therefore all aqueous solutions are acids”
A sample of gas has a volume
of 0.325 L at 55°C and a
pressure of 1.5 atm. At what
temperature does this gas have
a volume of 0.750 L and a
pressure of 2.5 atm??
0.75x2.5x328/(0.325x1.5)
=1261.5K
I DESPARATELY NEED HELP PLSSSS
Answer:
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Explanation:
When compared to the standard hydrogen electrode, zinc has a reduction potential of -0.762 volts and copper a reduction potential of + 0.342 volts. What is the reduction potential when zinc and copper are connected to one another?
+0.420 volts
-0.420 volts
+1.104 volts
-1.104 volts
Answer:
When compared to the standard hydrogen electrode, zinc has a reduction potential of -0.762 volts and copper a reduction potential of + 0.342 volts. What is the reduction potential when zinc and copper are connected to one another? Standard Santand Inc ар -40 INC IM IM Z IM ಅವಳ ದdಂಗpa volts 0.420- volts 0.420- volts 0.420- volts 1.104+
Explanation:
Btw brainliest me plss
How do you identify the element shown in a Bohr model?
Answer: There are three main factors that characterize the Bohr model. First, in the Bohr Model, the orbits have a set size and energy. There’s a correlation between energy and size: the smaller the orbit, the less energy it has. Electrons can move from one orbit to another by emitting or absorbing radiation.
Explanation: Hope this helped !
If Frank creates 20 waves every 10 seconds, then how many waves does he create EVERY SECOND?
Answer:
2 waves
Explanation:
If Frank creates 20 waves every second then the way you solve is turn it into a proportion 20 waves/10 secs = x/1 sec which then turns into the equation of 10x=20 where x=2 hence Franks creates 2 waves every second.
Will give brainliest and 20 points if you help!
Answer:
135 kPa
Explanation:
Calculate the wavelengths of the following objects:
Part 1 (1 point)
See Periodic Table See Hint
a muon (a subatomic particle with a mass of 1.884 x 10-25 g) traveling at 340.0 m/s
nm
Part 2 (1 point)
an electron (me = 9.10939 x 10-28 g) moving at 4.15 x 106 m/s in an electron microscope
nm
Part 3 (1 point)
an 82.0 kg athlete running a "4-minute mile" (i.e. 4.00 min/mile)
x 10-25
nm
Part 4 (1 point)
Earth (mass = 6.00 x 10278) moving through space at 3.20 x 10m/s
x 10
nm
A balloon is filled to a volume of 2.00 L with 3.50 moles of gas at 25
°C. With pressure and temperature held constant, what will be the
volume of the balloon if 1.60 moles of gas are added?
ANSWER;
2.914 L
Explanation:
A balloon is filled to a volume of 2.00 L with 3.50 moles of gas at 25
°C. With pressure and temperature held constant, what will be the
volume of the balloon if 1.60 moles of gas are added?
WE HAVE INCREASED THE NUMBER OF PARTICLES THE BALLOON BY
45.7%
ALL OTHER THINGS EQUAL, WE HAVE INCREASED THE VOLUME BY
45.7%
THE NEW VOLUME SHOULD BE 2.00 X 1.457= 2.914 L