Answer: The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity.
Explanation:
....
Answer:
They give us things that we couldnt get anywhere else and arent harmful to the enviornment
Explanation:
A student drops a 95g object into a graduated cylindor that has 30ml of water in it. After the object is added to the cylinder the water level reads 63ml. What is the density of the object?
Answer:
The answer is 2.88 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 95g
volume = final volume of water - initial volume of water
volume = 63 - 30 = 33 mL
We have
[tex]density = \frac{95}{33} \\ = 2.87878787...[/tex]
We have the final answer as
2.88 g/mLHope this helps you
2. Ultraviolet radiation has a frequency of 6.8 x 10'5Hz. Calculate the energy, in
joules, of the photon.
Answer:
[tex]E=4.5\times 10^{-18}\ J[/tex]
Explanation:
It is given that, the frequency of Ultraviolet radiation is [tex]6.8\times 10^{15}\ Hz[/tex]
We need to find the energy of the photon. The formula for the energy of a photon is given by :
[tex]E=hf\\\\\text{Where h is Planck's constant}\\\\E=6.63\times 10^{-34}\times 6.8\times 10^{15}\\\\E=4.5\times 10^{-18}\ J[/tex]
So, the energy of the photon is [tex]4.5\times 10^{-18}\ J[/tex].
what do waves carry from place to place
Answer:
Waves carry energy from place to place.
Explanation:
Some waves are used for mainly communication and phone signals. They help people get internet in the middle of nowhere if you are near an energy wave.
What is true about the formation of a bond?
Answer:
There is an overall release of energy when bonds form.
Explanation:
There is a general release of energy when bonds form. This energy is called bond energy.
Bond energy is involved in the breakdown or formation of one or more bonds between atoms of a molecule. Atoms bond with each other to achieve their electronic stability, that is, they move from a higher energy situation to a lower energy one. With this we can state that when the bond between atoms is formed, energy is released; therefore, its breakdown depends on energy absorption.
Which landform is created by glaciers? A. sandbar B. moraine C. alluvial fan (will give brainliest to the best answer)
Answer: B: Moraine
Explanation:
Identify the reactants and products, and describe the change in energy that occurs as bonds are broken and formed.
Answer:
Chemical reactions almost always have a change in energy between products and reactants. The total energy of a system must remain the same and sometimes a chemical reaction will absorb or release energy as light, heat or both. The energy change in a chemical reaction is caused by the amount of stored energy between the products and the reactants.
Explanation:
A student compared some chemical and physical properties of three pure substances. Her
data are recorded in the chart above. What is a logical conclusion the student can draw
about hare substances?
Pure substances have the same chemical and physical properties.
Pure substances have the same chemical properties, but different physical properties.
O Pure substances have the different chemical properties, but the same physical properties.
O Pure substances have different chemical and physical properties.
Answer:
letter b not c
Explanation:
next time please take a picture lucky i already took this
Describe what will happen to the pressure of the gas as the plunger is pushed in.
Answer:
The pressure of gas will increase.
Explanation:
The question above is related to "Boyle's Law." According to this law, provided that the temperature and amount of gas are stable, the absolute pressure of gas is inversely proportional to its volume.
In this sense, if the plunger will be pushed in, the volume of the gas will definitely decrease due to lack of space while the pressure will increase because the molecules of the gas are colliding with each other. The greater the collision, the greater the pressure. This explains the answer above.
how many atoms in a sugar cube
Answer:
Sugar is made up of carbon, hydrogen and oxygen atoms. It's the way these atoms are connected that makes each type of carbohydrate different. In each molecule of table sugar there are: 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.
Explanation:
A neutral atom of sulfur becomes an ion with a negative two charge by?
Answer:
The valence shell (the 3s and 3p sublevels) contains six electrons, but it needs eight to become stable. Think of the octet rule. Therefore a sulfur atom will gain two electrons to form the sulfide anion with a charge of 2− , with the symbol S2− .
Which phrase best describes igneous rocks?
form when lava and magma cool
accumulate sediments following erosion
require heat and pressure to be formed
consist of many sediment layers
ctivity
Answer:
A) form when lava and magma cool
please give me brainliest :p
God bless!
Answer:
A: form when lava and magma cools
Explanation:
Got it right on Edge 2020 :)
Which of these elements is most likely to be a colorless gas based on the type of element? Al, Pd, Ar, Cs
What are some things that uses oxygen
Answer:
Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.
The letters ROYGBIV represent the colors of visible light. Arrange them in order of:
Increasing energy
which property of a sound wave is related to the pitch of the sound?
Answer:
Frequency
Explanation:
I do not see the options but I know the answer:
The frequency of a sound wave is what your ear understands as pitch. A higher frequency sound has a higher pitch, and a lower frequency sound has a lower pitch.
If you find my answer helpful
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Answer:
frequency
Explanation:
vaild
explain the effect of temperature, pressure, volume and concentration reaction rate
When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases. Pressure is also related to concentration and volume.
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Ore deposits contain high amounts of
A) water
B) volcanic magma
C) metals
D) minerals
what causes the tides
Answer:
Gravity causes tides
Explanation:
(Please try to answer my most recent question!!!!!)
ultraviolet radiation has a higher frequency than visible light. which type of light wave carries more energy?
a=they carry the same amount of energy
b=visible light
c= ultraviolet radiation
Answer:
The answer to this question is C; ultraviolet radiation
Explanation:
The the reason for this is because it carries more energy per photon than visible light does. Light travels at a speed of 299,792 kilometers per second (about 186,282 miles per second).
A large marble is dropped in a graduated cylinder with 45 mL of water in it. The water level increased to 61 mL. What is the volume of the marble?
Answer:
Volume of the marble is 16 ml.
Initial volume present in graduated cylinder=45 ml.
Final volume in graduated cylinder after marble is dropped=61 ml.
Volume of water displaced=volume displaced by marble.
Volume displaced by marble=final volume in cylinder-initial volume in cylinder
Volume displaced=61ml-45ml=16ml
So volume of marble=16ml.
Answer:
16mL
Explanation:
Describe cycling or movement of water throughout earths spheres. Explain why the process is considered a cycle. Write a complete paragraph (five complete sentences minimum) in order to receive full credit for this activity
Answer:
This process is considered as a cycle because it continues and dosent stops. This process includes the evaporation of watet from earth surface due to heat.this water is converted in to water vapours. After reaching clouds it condences back. When the clouds become heavy with watef it falls back on earth as rain.and the process repeats.
Explanation:
Calculate the volume in milliliters of a 5.05-g sample of a solid with a density of 3.25 g/mL.
Answer:
The answer is 1.55 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 5.05 g
density = 3.25 g/mL
We have
[tex]volume = \frac{5.05}{3.25} \\ = 1.5538461...[/tex]
We have the final answer as
1.55 mLHope this helps you
Which of the following presents the steps of the engineering process in the correct order?
1.Identify a need, make a plan know the background, do the work, test the results, evaluate and redesign
O
2. dentify a need, know the background, do the work, make a plan, evaluate and redesign, test the results
3. Know the background, identify a need, make a plan, evaluate and redesign, do the work, test the results
4.Identify a need, know the background, make a plan, do the work, test the results, evaluate and redesign
Answer:
4
Explanation:
I got it right
The engineering process in the correct order "Identify a need, know the background, make a plan, do the work, test the results, evaluate and redesign"
What is engineering process?At an industrial level, process engineering is just the understanding as well as application of fundamental natural principles and laws that allow people to transform raw materials along with energy into products that seem to be beneficial to society.
What is redesign?Redesign, in terms of building, is the procedure of finding a solution to such a project. this includes then writing instructions that allow such a solution to be built.
The engineering process in the correct order "Identify a need, know the background, make a plan, do the work, test the results, evaluate and redesign"
To know more about engineering process and redesign
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at room temperature oxygen gas travels at 393.5 meters per second. How fast does oxygen travel in mile per hour ?
Answer:
Oxygen travels in 1,416,600
Explanation:
Which components are part of all scientific investigations? Check all that apply.
Answer:
Steps of a scientific investigation include 1. make observation
2. ask a question
3. form a hypothesis
4. test the hypothesis
5. analyze results
5 , drawing conclusions,
6. and communicating the results
Which example illustrates public scientific communication?
O A scientist collaborates with other scientists to plan an experiment.
O Ascientist sends a preview copy of a journal article to some colleagues.
O A federal government agency holds a press conference to describe the response to and the dangers of a new virus
epidemic,
A federal government agency publishes an article in a professional scientific journal detailing technical details of a
new virus
Answer:
D. A federal government agency publishes an article in a professional scientific journal detailing technical details of a new virus.
Explanation:
Public scientific communication is a way used by scientists to make the audience able to understand the basics of science to communicate an informed decision. There are several skills under public scientific communication that include connect with the public, talk to journalists, make science understandable, and understand the audience.
The best way to connect with the audience is to publish an article in a professional scientific journal because mostly journals are peer-reviewed having standard of quality.
A federal government agency informing about a new virus through an article in a professional scientific journal is the best way of public scientific communication as it will be for a specific audience along with a standard of quality.
Hence, the correct answer is "D".
How much space does 2 x 10^22 atoms of copper take up?
Answer:
2.35mL
Explanation:
The amount of space a substance holds is its volume.
Density = mass (g) /volume (L)
Where;
mole = mass/molar mass
Since 1 mol of Cu contains 6.022 × 10^22 atoms.
There are 2 x 10^22/6.022 × 10^22 moles in 2 x 10^22 atoms of copper
2 x 10^22/6.022 × 10^22
2/6.022 × 10^(22-22)
0.332 × 10^0
0.332mol
Mole = mass/molar mass
0.332 = mass/63.5
mass = 63.5 × 0.332
mass = 21.08g
Density = mass/volume
Density of copper (Cu) is 8.96 g/cm³
8.96 = 21.08/v
V = 21.08/8.96
V = 2.35mL or cm³
what are the units for the volume of a solid volume of a liquid
Answer:Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains.
Explanation:
Please Answer. What is the density of an object that has a mass of 13g and a volume of 25 cm3?
Answer:
The density of object is 0.52 g/cm³
Explanation:
Given data:
Density of object = ?
Mass of object = 13 g
Volume of object = 25 cm³
Solution:
Formula:
d = m/v
d = 13 g/ 25 cm³
d = 0.52 g/cm³
Thus, the density of object is 0.52 g/cm³.
The density of cadmium is 8.65 g/mL, what is the volume of a 33.4 g object made of pure cadmium?
Answer:
Volume = 3.86 ml (Approx)
Explanation:
Given:
Density of cadmium = 8.65 g/ml
Mass of pure object = 33.4 g
Find:
Volume pure cadmium
Computation:
Volume = Mass / Density
Volume = 33.4 / 8.65
Volume = 3.86 ml (Approx)