Answer:
Different colors of light are associated with different photon energies. Essentially, a photon is a packet of light. For example, a photon of red light would have less energy than a photon of blue light. This ties in with wavelengths because red has longer wavelengths than blue which results in less energy.
Explanation:
Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV. Visible light's neighbors on the EM spectrum are infrared radiation on the one side and ultraviolet radiation on the other.
What is the frequency
Answer:
The frequency is the rate at which current changes direction per second.
How many significant figures does the answer of 2.5 + 9.520 contain?
The general rule of sig figs is that if there's a number with less sig figs than another, you should use the amount of sig figs in that number.
For example, if you have the numbers 1 and 7.86 and add them together, 1 only has one sig fig and 7.86 has three. Therefore, you'd add 8.86 and then round up so you have one sig fig as your answer (9).
So now, applying what we know:
[tex]2.5+9.520\\= 12.020\\=12[/tex]
You can see that we rounded down to 12 because there need to be only two sig figs here. If we wrote our answer as 12.0, this would be three sig figs since the 0 after the decimal counts.
Final answer: 2 sig figs
I hope this helps!
Common brass is a copper and zinc alloy
containing 37.0% zinc by mass and having a
density of 8.48 g/cm³. A fitting composed of
common brass has a total volume of 121.5 cm³
Common brass is a copper and zinc alloy.
it contains 37.0% zinc by mass and having a
density of 8.48 g/cm³. A fitting composed of
common brass has a total volume of 121.5 cm³
as per avove staement , we have got
mass of copper = 63%
density = 8.48 g/cm³
volume =121.5 cm³
now,
Mass of Fitting = Vol * Density = 8.48 * 121.5= 1030 gm.
Mass of copper = 63% of 958.24 = 603.7 gm.
Moles of copper = mass/Mol. wt. = 603.7/63.5 ; [Mol wt. of copper = 63.5]
= 9.507 moles.
Therefore, Atoms of Copper = Moles * NA = 9.507*6.022*10^23
= 5.725*10^24 atoms.
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Would barefoot footprints be considered trace or physical evidence?????
Answer:
I would say Physical Evidence.
Explanation:
I am not so sure, so you can look up trace evidence versus physical evidence, and decide what barefoot footprints would fall into.
Use the oxidation number method to balance the following equations: a) Al(s) + H2SO4 (aq) Al2(SO4)3 (aq) + H2 (g)
By using oxidation number method , the balance chemical equation is given by :
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
the give equation is :
Al + H₂SO₄ ------> Al₂(SO₄)₃ + H₂
1) write the oxidation number of each atom
reactant product
Al 0 +2
H +1 0
S +6 +6
0 -2 -2
2) Identify the atom which is oxidized and reduced and balance the for these.
Al is oxidized, from 0 to +3 and hydrogen is reduced from +1 to 0.now to balance Al and H, multiply 2 on the right side
2Al + H₂SO₄ ------> Al₂(SO₄)₃ + H₂
3) calculate the total increase in oxidation number in oxidation and same for reduction.
2Al⁰ to 2Al⁺³ ( so total increase is +6)
2H⁺¹ to 2H⁰ ( decrease in -2 )
4) now, make total increase in oxidation number = total decrease in oxidation number .for this multiply 3 to hydrogen both side to get decrease of -6.
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
There fore, the balance chemical equation by oxidation number method is given as :
2Al + 3H₂SO₄ ------> Al₂(SO₄)₃ + 3H₂
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What does the first law of thermodynamics say?
According to the first law of thermodynamics, the total energy of a system, including its surrounds, is conserved if heat is acknowledged as a kind of energy.
The study of thermodynamics looks at the connections between heat, work, temperature, and energy. The movement of energy from one place or form to another is the main focus of thermodynamics. The underlying concept is that heat is a form of energy that may be compared to a certain amount of mechanical work.
The heat was not formally recognized as a form of energy until around 1798, when British military engineer Count Rumford (Sir Benjamin Thompson) discovered that endless amounts of heat could be produced while boring cannon barrels and that the amount of heat produced is proportional to the work done while turning a blunt boring tool. Rumford's finding of the relationship between heat produced and work completed served as the theoretical cornerstone for thermodynamics.
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Sequence
5. How is a mechanical
wave produced?
A wave is produced
when something
Each
produces a wave.
Waves keep
moving even
after the
stops.
A disruption or vibration in matter, whether solid, gas, liquid, or plasma, is what generates mechanical waves.
How does a mechanical wave work?Mechanical waves are caused by a disruption or vibration in matter, whether it is solid, gas, liquid, or plasma.Mechanical waves are waves that travel through a solid, liquid, or gas at a rate determined by the elastic and inertial properties of the medium. Mechanical waves, which are the two most common wave motions, can move in either longitudinal or transverse directions. The transmission of energy through a medium is caused by an oscillation of matter known as a mechanical wave. The transmission medium limits the distance a wave can travel. There is almost no translational motion in this case, and the oscillating material rotates around a fixed point.To learn more about : mechanical wave
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Suppose that Trial I in this lab was run using 0.10 M NaOH, producing a linear kinetics graph with best-fit equation y = -0.00275 x + 0.222. If Trial Il was run using 0.20 M NaOH, what would the slope of the same graph be if the reaction were (a) zero order, (b) first order, or (c) second order?
For different order Kinetics the lineer graph is different plots.
For Zero order reaction, the integrated rabe law is
[A] = [A]₀-Kt K =rate constant
[A] vs t graph is straight line with slope = -k
For first order reaction, the integrated rate law is
In [A] = In [A]o - Kt
In [A] vs t graph is straight line with slope = -K
For second order reaction, the integrated rate law is
1/[A]= 1/ [A]o + Kt
1/[A] vs t graph is straight line with slope = +k
So, for all cases the slope of straight line is either +k or -K.
k'is rate constant only depends on temperature not on concentration of reactant.
So the slope will not change for Trial II with 0.2m Naoh.
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6. Explain the movement of thermal energy when cans of warm soda are covered with ice.
Also explain what happens to the temperature of the soda cans and what happens to the ice.
The temperature of the can reduces and it turns into ice and the thermal energy is exchanged between the walls.
Any residual gas molecules will also cool in the cold water, which reduces their kinetic energy and lessens the number of times they collide with the can's walls. As a result, the pressure inside the can is reduced. The can collapses because the air pressure outside is greater than the air pressure inside.The cold water will also chill any gas molecules that are still there, lowering their kinetic energy and reducing the number of times they will collide with the can's walls. The pressure inside the can is reduced as a result. The can collapses because of the difference in air pressure between the outside and inside of the can.To learn more about air pressure visit:
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Which of the following statements is TRUE about graphic scores?
A. Graphic scores can only be written on manuscript paper
B. The performer can interpret the score however he/she wishes
C. Graphic scores cannot show dynamic changes
D. The composer is not allowed to make suggestions regarding the performance
Answer: I think its B
Explanation:
please lmk if I'm wrong.
In their resting state, all body cells exhibit a resting membrane potential ranging from -50 to about +50 millivolts.
Question 21 options:
True
False
In their resting state, all body cells exhibit a resting membrane potential ranging from -50 to about -100 millivolts. So, the statement is false.
What is Body cells?The fundamental units of all living things are cells. There are many billions of cells in a human body.
They give the body structure, consume nutrients from meals, transform those nutrients into energy, and perform certain tasks.
All bodily cells are polarised because they all have a resting membrane potential when they are at rest.
All body cells, depending on the kind of cell, have a resting membrane potential that normally ranges from -50 to -100 millivolts. All cells are considered to be polarised as a result.
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Two movers are attempting to push a couch up a ramp. One mover applies a force of 80 N to the right, but the force of friction
between the couch and the ramp is providing a force of 110 N in the opposite direction, and the couch slides down the ramp.
At minimum, how much force will the second mover need to apply to help push the couch-up the ramp?
(1 point)
O 30 N
O 110 N
0 31 N
O 80 N
Answer:
31 N
Explanation:
4) A pure metal and an interstitial alloy containing the same metal were examined. Predict which
substance will have a greater density and justify your selection.
The interstitial alloy would be more dense than the pure metal.
What is density?Density is the ratio of the mass to the volume of an object. Now we know that the more dense the object is the more the atoms of the object are packed together.
An alloy is a combination of two or more metals. This implies that in an alloy we are certainly going to have more elements packed into a smaller space than in a pure metal. The pure metal contains only one type of atoms but the alloy contains more than one type of metal atoms packed into a small space.
Thus, the interstitial alloy would be more dense than the pure metal.
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Can can someone help me 49-58 I give Brainly
By placing this passage at the beginning of the story, the author builds suspense for the arrival of
.
How many grams of sodium azide are required to produce 31.0 g of nitrogen?
Answer:
1 Gram of sodium azide produces 2.25 grams of nitrogen, so you would need about 13.7777777778 grams of sodium azide to produce 31 grams of nitrogen
Explanation:
What is a control group used for?
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Unless otherwise informed report each
numerical answer in standard notation to 3
significant figures. point Pick the choice that
is the most reasonable metric measurement
for the mass of a bullet
a)420 mL
b) 420 ng
c)420 Gg
d)420 g
e)420 cg
The first ionization energy, , of a helium atom is 2.37×103 kJ/mol . What is the wavelength of light, in nanometers, that is just sufficient to ionize a helium atom?
The wavelength that is sufficient to ionize the helium atom is 510 nm.
What is the ionization energy?Let us recall that the ionization energy is the energy that is required to remove an electron from an atom. The first ionization energy is the energy that is required to remove the first electron from an atom. The electron is often removed from the valence shell of the atom.
We have the following information;
Energy of the electron = 2.37×10^3 kJ/mol * 1 mole/6.02 * 10^23
= 3.9 * 10^-18 J
Now;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = speed of light
λ = wavelength
λ = hc/E
λ = 6.6 * 10^-34 * 3 * 10^8/3.9 * 10^-18 J
λ = 5.1 * 10^-8 m or 510 nm
Hence, the wavelength that is sufficient to ionize the helium atom is 510 nm.
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1.60mL of ethanol in microliters
Answer:
1600 microliters
Explanation:
µl =mL ÷ 0.0010000 so 1.60÷0.00010000=1600
Many metallic catalysts, especially precious metal catalysts are deposited as thin films on materials with a very high surface area. Why is this an effective way of utilizing the precious metal? (You can choose more than one)
a. If the catalyst is only present in a very thin layer, not very much is needed. This saves money.
b. Surface-deposited catalysts do not work; the whole catalyst material must be homogenous.
c. The material on which the catalyst is deposited causes alternative reactions to occur which would end up reducing percent yield.
d. Only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
D. only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
How does surface area affect reaction of a catalyst?
Increasing the surface area of a catalyst increases the frequency of collisions and increases the reaction rate.
Several smaller particles have more surface area than one large particle. The more surface area that is available for particles to collide, the faster the reaction will occur.
Thus, it is important way of utilizing the catalyst because only the surface material reacts, so having the entire material be made of the catalyst is not necessary.
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What is the ph scale including acid and base number ranges
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Fill in the blanks. 1. A(n). is a way of showing the chemical formulas and symbols of the substances that react and form in a chemical reaction. 2. The "before" and "after" parts of a chemical reaction are separated by a(n) in the chemical equation. 3. In any chemical reaction, the total not change, no matter what new products form. of the substances does
1-chemical equation.
2-an arrow.
3-only the atoms present in the reactants can end up in the products.
What is a basic chemical equation?The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation. The overall charge and the number of atoms in each element are equal on both sides of a balanced chemical equation.
What constitutes balancing a chemical equation in four steps?Step 1: Set Up a Table. Subscripts and coefficients are both present in chemical equations.
Step 2: Determining and Balancing the First Element. Pick an element that appears in one molecule on the left side and in one molecule on the left.
Step 3: Balancing Hydrogen.
Step 4: Balancing Oxygen..
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Formulate your hypothesis for the problem. Design an experiment to test your hypothesis.
making up an answer:
I hypothesize that water will evaporate quicker under an incubator than on the counter.
The experiment; Equal amounts of water in the same type of containers, one under an incubator, and one on a counter with even temperature.
which of the following explains why scientists assume that the law of universal gravitation is true on all of the planets in the Solar System
Scientists assume that the law of universal gravitation is true on all of the planets in the Solar System because The planets are always moving perpendicular to the Sun's gravitational attraction, which causes them to follow an elliptical route around it.
According to Newton's universal law of gravitation Every particle in the universe is said to attract every other particle with a force along a line that connects them.The force is inversely proportional to the square of the distance between them and directly proportional to the sum of their masses.F = G(m₁ × m₂ /r²)Where, F is gravitational force between two bodies.
m₁ and m₂ are masses of the bodies.
r is the separation between the two bodies' centres.
G is universal gravitational constant = 6.673 x 10⁻¹¹Nm²/kg².
Big or little, the Law is applicable to all objects having masses. If the distance between two massive objects is very large to their sizes or if they are spherically symmetric, they can be thought of as point-like masses.Thus law of universal gravitation is true on all planets.
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Find volume, mass and density of object?
Given 30.30 grams and 30.32 grams
The volume of object is 0.99 L
Here, the given mass of the object is 30.30g
Given density of the object is 30.32g/L
Density = Mass / volume
⇒ volume = mass/density
=30.30g / 30.32g/L
=0.99 L
Density is the measures how tightly a material is packed together.
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Question Which type of object creates the most friction? Responses hard objects hard objects rough objects rough objects smooth objects smooth objects soft objects
The type of object that creates the most friction is a rough object.
What is frictional force?This is the force that opposes the motion of an object. It usually exist between two surfaces that are in contact.
Factors affecting frictional force include the following;
The frictional force between two bodies depends mainly on the following factors:
(I) forces acting on the objects
(ii) type of the surface in contact
(iii) position or inclination of the surfaces
How to reduce frictional force between two surfaces;
Frictional force can be reduced with lubricantsFrictional force can be reduced using bearings in moving parts,Frictional force can reduced using inclined surfacesThus, the type of object that creates the most friction is a rough object.
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An atom has 5 protons, 6 neutrons, and 6 electrons. What is the charge of the atom?
Answer:
1-
Explanation:
the charge of an atom is determined by the number of protons and electrons present, in this case the number of electrons is more than the protons by 1, hence it is a minus 1 charge
What is the name of the person who sings or chants a solo line in the style of call and response?
A. Call Leader
B. Melody Singer
C. Solo Singer
D. Song Leader
Match each type of rock with the way it is formed.
pressure and heat
cooling magma
erosion and deposition
cooling lava
intrusive igneous rock
arrowRight
extrusive igneous rock
arrowRight
sedimentary rock
arrowRight
metamorphic rock
The correct match is as follows:
Pressure and heat - Metamorphic rock
Cooling magma - The Intrusive igneous rock
Cooling lava - The Extrusive igneous rock
Erosion and Deposition - Sedimentary rock
This is because Metamorphic rocks are formed as a result of past existing rocks changing form. If the igneous and sedimentary rocks are exposed to high temperature and pressure, they then become metamorphic rocks.
Intrusive igneous rocks form when magma cools slowly. This process soon results in the formation of large-crystal like structures. Whereas, when exposed to the atmosphere lava cools rather quickly. This faster cooling process forms extrusive igneous rocks. The fast cooling lava creates smaller crystals and a smoother surface.
The sediments that are formed as a result of weathered rocks are usually deposited on the surface of Earth, or at the bottom of rivers and oceans. Over time, sediments collect and form layers over the most recent layer. This leads to the formation of sedimentary rocks.
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Answer:
I believe this is your answer, or wait I know this is your answer
Explanation: