Answer:
The phenomenon that works here is called Total internal reflection
Explanation:
When the angle of incidence is increased past the critical angle, the refracted angle will not exit the medium and all incident light will reflect back off a boundary back into the first medium.
This phenomenon is called Total Internal Reflection. Total Internal Reflection will only occur with a large angle of incidence that is greater than the critical angle.
Now, when we talk about the second medium
using the Law of refraction
Sini/Sinr =refractive index of medium 2/ refractive index of medium1
when the light ray passes from denser medium to rarer medium TIR happens along with angle of incident should be greater than critical angle. In this case incident angle is 45 degrees
conclusion: medium 2 is rarer here than medium 1
Why does the pressure of a gas increase when the temperature increases and the volume remains the same?
Answer:
If the average kinetic energy of the particles (temperature) remains the same, the average force per particle will be the same. With more particles there will be more collisions and so a greater pressure.
what happened that alowed cells to be studied
Determine the mass of 3 moles of H2O
Answer:
Short answer 18x3=54 gram
Explanation:
When you express molecular mass (in case of molecule)/atomic mass(in case of atom) in gram it will be equivalent to one mole. For example:
12 gram Carbon atom = 1 mole of Carbon atom = N number of Carbon atom
16 gram Oxygen atom= 1 mole of Oxygen atom = N number of Oxygen atom
32 gram Oxygen molecule (O2) = 1 mole of Oxygen molecule (O2) = N number of Oxygen molecule (O2)
similarly 1 mole of water is equivalent to molecular mass of water x 3 that is 18x3=54 gram. It would constitute 3N molecules of water.
N: Avogadro's number : 6.022140857 × 10^23
Explanation:
According to the mole concept ,the mass of 3 moles of H₂O or water is 54 g.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles is obtained as, mass/molar mass.Substituting number of moles as 3 and molar mass as 18 g mass=18×3=54 g.
Thus, the mass of 3 moles of H₂O is 54 g.
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Write formula for:nickel (V) sulfate
Answer:
NiSO4
Explanation:
Sulphur has got 2 valence electrons that it gains and on the exchange of the valence electrons with Nickel, which provides a number of valence electrons that cancels easily with those of sulphur, the we shall have the remainder of four electrons at the the bass of the formula
How do I put this in my own words someone help??
One way to rephrase it is to say: "All life depends on photosynthesis because plants use the sun's energy to make oxygen for animals to breathe. Also, animals rely on plants for energy when they eat the plants"
What evidence supports a scientist's conclusion that fossil B is older than fossil A? Fossil A and fossil B were both found at the same depth below Earth's surface. Fossil B was found at a depth of 185 meters below Earth's surface, while fossil A was found at a depth of 50 meters below Earth's surface. O Fossil B was found at a depth of 50 meters below Earth's surface, while fossil A was found at a depth of 185 meters below Earth's surface. Fossil A was found below Earth's surface, while fossil B was found at surface level.
Answer:
Fossil B was found at a depth of 185 meters below the Earth's surface, while fossil A was found at a depth of 50 meters below the Earth's surface.
Explanation:
Because if fossil B was found at a lower depth then it would be older than fossil A
Hope this helps, have a good day :)
Answer:
Fossil B was found at a depth of 185 meters below Earth's surface, while fossil A was found at a depth of 50 meters below Earth's surface.
Explanation:
I hope this is an answer choice but this would support fossil B being older than fossil A bc the deeper the fossils are in the earth’s surface means that its older.
The element Chemistrium (Ch) has 2 varieties, Ch-105 and Ch-117. Ch-110 has a % abundance of 56%. Find the average atomic mass of Ch.
If speed is measured in meters per seconds (m/s) and time is measured in seconds, the SI unit of accelerating is m/s2. Imagine you are riding a motorcycle that is accelerating at a rate of 6m/s2. What is the motorcycle's speed after three seconds of acceleration?
Answer:
The motorcycle's speed after three seconds of acceleration is 18 [tex]\frac{m}{s}[/tex]
Explanation:
Acceleration is a vector quantity that relates changes in speed to the time it takes to occur. Its unit of measurement, in the International System is meters per second squared [tex]\frac{m}{s^{2} }[/tex]. This is expresed as:
[tex]acceleration= \frac{change in speed}{time}[/tex]
Acceleration relates changes in speed with the time in which they occur, that is, it measures how fast changes in speed are:
A large acceleration means that the speed changes rapidly. A small acceleration means that the speed changes slowly. Zero acceleration means that the velocity does not change.In this case you know:
acceleration= [tex]6\frac{m}{s^{2} }[/tex]speed=?time= 3 secondsReplacing:
[tex]6 \frac{m}{s^{2} } = \frac{speed}{3 seconds}[/tex]
Solving:
speed= [tex]6\frac{m}{s^{2} }[/tex] * 3 seconds
speed= 18 [tex]\frac{m}{s}[/tex]
The motorcycle's speed after three seconds of acceleration is 18 [tex]\frac{m}{s}[/tex]
Write the letter of the definition next to the matching word as you work through the lesson. You may use the glossary to help you. flammable A. An action that is taken to prevent harm hazardous waste B. Able to burn easily precaution C. An unwanted product that may pose a threat to human health or to the environment
The answer is B........
To obtain the number of neutrons in a neutral atom, you use the formula
which one im confused
Answer:
So, to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number. # of neutrons = Mass Number - Number of Protons To be able to apply this formula, refer to the atomic number and atomic weight of the elements. These two are listed in the Periodic Table of Elements.
Explanation:
I'm new to brainly so I hope this helped
PLEASE ANSWER QUICK THANK YOU
If
then air temperatures increase *
O Carbon dioxide levels increase
O Carbon dioxide levels decrease
Carbon dioxide levels are not related to air temperature.
Answer:
If Carbon Dioxide levels go up then so does air temperature
In Bohr's model, electrons exist in orbits around the nucleus
which only exist at fixed distances from the nucleus called?
Answer:
They are called energy levels.
Explanation:
Are these two picures Chemical, Physical, or both Chemical and Physical changes?
Answer:
d is physical
f is chemical
The electrons are located where in the atom?
Answer:
The nucleus (center).
Explanation:
The atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Atoms have different properties based on the arrangement and number of their basic particles.
Hope this helped. :D
what is the formula for ammonium selenide
Answer:
(NH4)2Se
Explanation:
The chemical formula for compound ammonium selenide is (NH₄)₂Se.
Here's a step-by-step explanation of how we arrive at this formula:
1. Ammonium ion: The ammonium ion is represented by the formula NH₄⁺. It consists of one nitrogen atom (N) bonded to four hydrogen atoms (H).
2. Selenide ion: The selenide ion is represented by the formula Se₂⁻. It consists of one selenium atom (Se) with a charge of -2.
3. Combining the ions: To form a neutral compound, we need to balance the charges of the ions. Since the ammonium ion has a charge of +1 and the selenide ion has a charge of -2, we need two ammonium ions to balance the charge of one selenide ion.
4. Formula: Therefore, the formula for ammonium selenide is (NH₄)₂Se, indicating that two ammonium ions are required for each selenide ion.
Thus, ammonium selenide has chemical formula of (NH₄)₂Se.
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Is salt (NaCl) a compound or a
element
Element, compound
Answer:
Compound.
Explanation:
Salt is an ionic compound. How do I know?
When dissolved in water (water is a covalent compound), then salt will allow electricity to move through it because it is a conductor.
Other reasons:
High melting point.
High boiling point.
Strong bond.
Transfers electrons.
Made of a metal or nonmetal.
Etc.
How many atoms are in the chemical formula below?
K2B4O7
Answer:
There is 13 atoms in total.
Explanation:
There is 2 potassiums, 4 borons and 7 oxygens.
So 2 + 4 + 7 = 13 atoms
Hope this helps!
Which two statements are true for both compounds and mixtures?
A. Their particles all have the same chemical formula.
B. They can be separated into two or more elements.
C. Their particles are held together by chemical bonds.
D. They are made up of more than one type of atom.
SMIT
Answer:
its A and D
Explanation:
Match the element with its descripition
Potassium
Barium
Boron
Neon
A) Great conductor of heat and electricity
B) Has properties of both metals and nonmetals
C) Malleable and highly reactive
D) Nonreactive gas
Answer:
A) Potassium B) Boron C) Barium C) Neon
Explanation:
In order to determine an objects location, you need a ___
A. Time
B. Reference point
C. Speed
D. Displacement
In order to determine an objects location, you need to know the speed of the object by which it is moving.
What is speed?Speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval;the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel, the knot is commonly used.
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A balloon-borne package of sensors that gathers upper-level temperature, air pressure, and humidity is a. A radiosonde. C. A hygrometer. b. A satellite. D. Doppler radar
Answer:
Option A (A radiosonde) is the right response.
Explanation:
The Radiosonde would be a battery-powered telemetry method used to determine atmospheric parameters. It comprises such a weather balloon that receives information to something like a surface receiver via a radio. It's important although it serves as an important means of meteorological data collection.Some other alternatives offered are not connected to the circumstance in question. So, the alternative here was the right one.
Which of the following molecules has a trigonal planar shape? A P E X
Answer:
B. BF3
Explanation:
I did summoning jutsu on it and got it correct
Ionization energy (IE) is the energy required to remove an electron from an atom. As atomic radius increases, the valence electrons get farther from the nucleus. How do you think an atom's size will affect its ability to hold on to its valence electrons? Why?
Answer:
The larger the atom, the lesser the tendency for the atom to withhold its valence electrons.
Explanation:
The size of an atom is usually estimated in terms of its atomic radius. Across the period in the periodic table, the atomic radius decreases progressively from left to right. This is due to the progressive increase in the nuclear charge (i.e., the number of protons in the nucleus) without an attendant increase in the number of electronic shells.
Similarly, down the group, the atomic radius increases progressively from top to bottom due to the successive number of electrons' shells.
Thus, the larger the atom's radius, the smaller the Ionization energy because of the increasing shielding effect of inner shell electrons on the electron to be removed from the nuclear attraction.
Finally, we can conclude that as the atom becomes larger, the tendency to withhold the electrons on the outer shell decreases due to distance and the shielding/ screening effect.
Question 23 (1 point)
How many electrons are there in the third energy level of sodium, Na (atomic number 11)?
none
b
one
c
two
d
three
ine
Answer:
the answer is b, which is one
Vinegar is acidic and causes the surface of the egg shell to become positively charged. Why might this result in a chemical reaction with the food coloring while nothing seemed to happen to the egg in the water solution? What does this tell you about the charge of the food coloring molecules?
Answer:
Explanation:
In order to be able to solve this question/problem efficiently one has to understand the the concept of acidity. Using the Bronsted- Lowry definition, Acids can be defined as any substance that has the ability of donating proton/ Hydrogen ions,H^+.
REASON BEHIND THE POSITIVELY CHARGED SURFACE:
The protons that acids produces will react with the shell of the eggs which contains a calcium compound. When these protons from acid react with the shell of the egg there is productions of Calcium ion, Ca^2+ and other materials such as water.
WHY MIGHT THIS RESULT IN A CHEMICAL REACTION WITH THE FOOD COLORING WHILE NOTHING SEEMED TO HAPPEN TO THE EGG I
THE WATER SOLUTION?
Nothing happens to the water solution because water is not acidic. The positive ions (produced by the reaction of protons with the egg shell) are able to reach with negative ions.
WHAY DOES THIS TELL YOU ABOUT THE CHARGE OF THE FOOD COLORING MOLECULES?
They are negatively charged.
Plate Tectonics (8.9 A, B, C):Question 1
Seafloor spreading occurs along certain boundaries in the ocean.
Which are most likely to form at the boundary where the seafloor is
spreading?
Select one:
continental shelves
mid-ocean ridges
subduction zones
strike-slip faults
Answer:
wassup bro
Explanation:
It’s mid ocean ridges
I have to put them in order ! Please answer ASAP!
Answer:
the tops ones will be animal and plants
under cells it will be nucleus
the genes
the last three will be eye color, height, and type of fruit
Can you help me put this in my ‘own’ words? Please?
Answer: Plants have the ability to make the right amount of glucose to be used on nights or when there is a cloudy day. It can be kept in the plants leaves and other areas.
Explanation: pls mark brainiest thankss!!
The atomic number of an atom is also the number of _____________________ in an atom.
Explanation:
The atomic number of an atom is also the number of proton in an atom.
how do I make LiOH + CO2 -> Li2CO3 + H2O balanced?
*ignore the 10,10,30*
Answer:
2,1,1,1
Explanation:
4,2,2,2 (simplify)
