when a car goes around a curve at a constant speed, in which direction is it accelerating
A. In the direction of the velocity
B. In the opposite direction of the velocity
C. Outside the curve
D. Inside the curve
The blue color in some fireworks occurs when copper(I) chloride is heated to approximately 1500 K and emits blue light of wavelength 4.50 X 10 squared nm. How much energy of one photon of this light carry?
Given that,
Temperature, T = 1500 K
Wavelength, [tex]\lambda=4.5\times 10^2\ nm[/tex]
To find,
The energy of one photon of this light.
Solution,
We know that, the energy of a photon is given by the formula as follows :
[tex]E=\dfrac{hc}{\lambda}\\\\E=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{4.5\times 10^2\times 10^{-9}}\\\\=4.42\times 10^{-19}\ J[/tex]
So, the required energy is [tex]4.42\times 10^{-19}\ J[/tex].
Mary, the mouse, was hiding in the rocks when she saw a sandwich hit the ground at
the park. Being she was hungry, she decided to run to the sandwich, which was 30 feet
away. It took her 5 seconds to get to the sandwich. What was her average speed?
Help me if u good at science:)
How are mass and weight alike?
O A. Both are measured in pounds.
B. Both depend on how much matter an object has.
C. Both change with gravitational force.
OD. Both are the same everywhere in the universe.
Answer:
I belive it is B
2. Calculate the number of moles in 65.5 grams of the following:
a) Copper (II) Sulfate
b) Magnesium Nitrate
c) Potassium Carbonate
Answer:
a) Number of moles = 0.41 mol
b) Number of moles = 0.44 mol
c) Number of moles = 0.47 mol
Explanation:
a)
Given data:
Mass of copper sulfate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of copper sulfate = 159.6 g/mol
Number of moles = 65.5 g/ 159.6 g/mol
Number of moles = 0.41 mol
b)
Given data:
Mass of magnesium nitrate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of magnesium nitrate = 148.3 g/mol
Number of moles = 65.5 g/148.3g/mol
Number of moles = 0.44 mol
c)
Given data:
Mass of potassium carbonate = 65.5 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Molar mass of potassium carbonate = 138.2 g/mol
Number of moles = 65.5 g/138.2g/mol
Number of moles = 0.47 mol
explain how the removal of thermal energy (heat) from matter affects its particles
Answer:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster
Explanation:
NEED HELP ASAP FOR MY TEST
Which is an example of a mixture that can be separated using a filter and a funnel?
A) Kool Aid B) Coca Cola C) salt water D) Sand and water mixture
Answer: D sand and water
Explanation:
Since water is less dense than sand it could be easily separated if you go to the ocean that’s why the water is at the bottom of the sand but on above the sand so it will be able to separate easily.
Answer:
Answer: D sand and water
Explanation:
The following is NOT an example of a behavior:
Buying a lottery ticket
Jumping rope
Doing a 60 second plank
Making the decision to buy a lottery ticket
Which statement best describes how hou measure density
Answer:
density=mass/volume
Explanation:
density is defined as mass per unit volume.
predict the missing component in the nuclear equation
Answer:
¹⁴₇N
Explanation:
⁴₆C → ¹⁴₇N + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
Beta radiations:
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
Molecules that are loosely packed and move over and around each other are found in
O solids
O liquids
O gases
HELP QUICKK PLEASEEE
According to the Kinetic Molecular Theory, why does an increase of temperature cause an increase of pressure in a closed container?
The particles move faster and hit the walls of the container more often.
The particles move faster and hit the walls of the container more often.
The particles become larger and hit the walls of the container more often.
The particles become larger and hit the walls of the container more often.
The particles react more and hit the walls of the container more often.
The particles react more and hit the walls of the container more often.
The particles break apart and hit the walls of the container more often.
Answer:
According to Kinetic Molecular Theory, an increase in temperature will increase the average kinetic energy of the molecules. As the particles move faster, they will likely hit the edge of the container more often. If the reaction is kept at constant pressure, they must stay farther apart, and an increase in volume will compensate for the increase in particle collision with the surface of the container.
Explanation:
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Answer:
Option C: Combustion and synthesis only
Explanation:
This reaction is referred to as combustion reaction because carbon is burnt in oxygen to produce carbon (IV) oxide.
Also, it's a synthesis reaction because the two different atoms which are Carbon and oxygen interact to form a different compound which is CO2.
Thus, the correct answer is Option C: combustion and synthesis only
why does the newton's cradle stop swinging
How many moles are there in 2.0 grams NaCl?
Answer:
In 2 grams of NaCl are 116,88 mols
Explanation:
One mol of NaCl (6.02 x1023 formulas) has a mass of 58.44 g.
Calculation: 58,44g X 2 = 116,88
what do thermal insulators do?
Answer:
Thermal insulation. Thermal insulation is the reduction of heat transfer (i.e. the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence.
Explanation:
Answer:
The job of a thermal insulator is to reduce the heat transfer
Explanation:
If an element has 12 protons, 13 neutrons, and 15 electrons, what is its mass?
Answer:
25
Explanation:
mass number = protons + neutrons
= 13 + 12 = 25
what is the overall charge of an atom.
Overall, an atom is neutral charged. The Bohr model was for years accepted as the final authority because it agrees so well with experiment and observation. In this model an atom consists of a nucleus containing protons and neutrons. The neutrons are zero charge so we can forget them in looking for charges. For each proton (1 positive charge) there is always 1 electron (1 negative charge) in orbit around the nucleus. thus an atom has a equal number of electrons and protons and their net charge is zero.
We can do things to temporarily up set this natural balance (we call this electricity) but the atoms will eventually return to their naturally balanced state
Would you classify the atoms in the table as pure substances?
Answer:
Yes
Explanation:
Atoms are generally classified as pure substances. A pure substance has the following properties:
All parts are the same throughout i.e. homogeneousThey have definite compositionThe cannot easily be broken down into simpler substances by physical means. Separation by physical methods is not easy. They have unique sets of physical properties.Elements and compounds are generally classified as pure substances. Since atoms are the building blocks of pure substances, they can be classified as one.
_______________ are filled with special absorbing elements that move up and down between the uranium rods to keep the atoms from getting out of control.
Answer:
The correct answer is - control rods.
Explanation:
Control rods are filled with special absorbing agents such as boron, cadmium, silver, and others to absorb as many neutrons as to control the fission reaction by moving them up and down in between uranium rods.
These control rods are used to prevent the nuclear reaction from getting out of control in the nuclear plant or reactor by absorbing the neutrons and prevent uranium to convert.
Find the volume of a gas at 800.0 mm Hg and 40.0 °C if its volume at 720.0 mm Hg and 15 °C is 6.84 L.
Answer:
2 C6H6 + 15 O2 ( 12 CO2 + 6 H2O
Explanation:
6.156 L is the volume of a gas at 800.0 mm Hg and 40.0 °C if its volume at 720.0 mm Hg and 15 °C is 6.84 L.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
[tex]P_1V_1=P_2V_2[/tex]
[tex]P_1[/tex] = 800.0 mm Hg
[tex]V_1[/tex] = ?
[tex]P_2[/tex] = 720.0 mm Hg
[tex]V_2[/tex] = 6.84 L
Putting all the value in the equation;
[tex]P_1V_1=P_2V_2[/tex]
800.0 mm Hg X [tex]V_1[/tex] = 720.0 mm Hg X 6.84 L
[tex]V_1[/tex] =6.156 L
6.156 L is the volume of a gas at 800.0 mm Hg and 40.0 °C if its volume at 720.0 mm Hg and 15 °C is 6.84 L.
Learn more about an ideal gas equation here:
https://brainly.com/question/9360986
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How many micrograms (ug) are in 3.4 x 10^-5 ounces (oz)
Answer:
964ug
Explanation:
The problem here involves converting from one unit to another.
We are to convert from ounces to micrograms.
1ug = 1 x 10⁻⁶g
1oz = 28.35g
So we first convert to grams from oz then take to ug:
Solving:
1oz = 28.35g
3.4 x 10⁻⁵oz will then give 3.4 x 10⁻⁵ x 28.35 = 9.64 x 10⁻⁴g
So;
1 x 10⁻⁶g = 1ug
9.64 x 10⁻⁴g will give [tex]\frac{9.64 x 10^{-4} }{1 x 10^{-6} }[/tex] = 9.64 x 10²ug or 964ug
This planet is also called the "red planet"
O Mercury
O Venus
O Earth
O Mars
Answer:
mars
Explanation:
how can volcanic ash change Earths surface ?
Answer:
well, it made volcanos grow larger and it developed land
Explanation:
Gases and solids injected into the stratosphere circled the globe for three weeks. Volcanic eruptions of this magnitude can impact global climate, reducing the amount of solar radiation reaching the Earth's surface, lowering temperatures in the troposphere, and changing atmospheric circulation patterns.
Determine the number of particles present in 1.55 mol of sodium.
Answer: 1024 sodium ions
Explanation: The mathematical equation, N = n × NA, can be used to find the number of atoms, ions or molecules in any amount (in moles) of atoms, ions or molecules: 10 moles of helium atoms = 10 × (6.022 × 1023) = 6.022 × 1024 helium atoms. 10 moles of sodium ions = 10 × (6.022 × 1023) = 6.022 × 1024 sodium ions. (that took long)
Can you please help me this is due today and I really need help.
What is the name of the molecule with 1 iron atoms and 2 oxygen atoms
Answer:
Carbon
Explanation:
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Answer:
Fe, or the iron atom
Explanation:
The subscripts designate the number of atoms in the molecule. If there is no subscript, it is understood to be 1.
In your own words, describe the rock cycle including its processes and the formation of different rock types
Answer:
That’s a question on school- what- I-
Explanation:
How much energy is required to raise the temperature of 0.2 kg of aluminum
from 15°C to 18°C?
5382 J
B. 538 J
C. 600 J
D. 179 J
NHa is an
example of
O an element.
O a mixture.
O a compound
O an atom.
Answer:
what is the question
Explanation:
Answer:
COMPOUND
Explanation:
I THINK