What prediction did Mendeleev make that came true less than 20 years later?
A. He predicted the atomic numbers of unknown elements.
B. He said that three new elements would be discovered.
C, He predicted that a total of 112 elements would be discovered.
D. He said that the periodic table would be developed into 18 families.
Answer:
the answer is option B
Explanation:
Answer: He said that three new elements would be discovered.
If there are 20 waves in a 5-second time frame, what is the frequency?
If there are 20 waves in a 5-second time frame, the frequency of the wave is 4 Hz.
What are wave and wavelength?A wave is a disturbance that travels through space, carrying energy without transporting matter. Waves can take many forms, such as water waves, sound waves, light waves, and radio waves. In general, waves are characterized by their frequency, wavelength, amplitude, and velocity.
Wavelength is one of the fundamental characteristics of a wave. It is defined as the distance between two consecutive points in a wave that are in phase, that is, they are at the same point in their cycle. For example, in a simple sine wave, the wavelength is the distance between two consecutive peaks or two consecutive troughs.
The symbol used to represent wavelength is the Greek letter lambda (λ). Wavelength is typically measured in meters (m) or some other unit of length. In general, longer wavelengths are associated with lower frequencies and lower energies, while shorter wavelengths are associated with higher frequencies and higher energies.
The relationship between wavelength, frequency, and velocity is given by the formula:
velocity = frequency x wavelength
This formula shows that as the frequency of a wave increases, its wavelength decreases, and vice versa, assuming the velocity remains constant. Similarly, as the wavelength of a wave increases, its frequency decreases, and vice versa, assuming the velocity remains constant.
So, a wave is a disturbance that travels through space carrying energy without transporting matter, while wavelength is the distance between two consecutive points in a wave that are in phase.
Here in the question,
The frequency of a wave is defined as the number of cycles or oscillations that occur in one second. The unit of frequency is hertz (Hz). To calculate the frequency of a wave, we can use the following formula:
Frequency = Number of cycles / Time
In this case, we are given that there are 20 waves in a 5-second time frame. Therefore, the number of cycles is 20, and the time is 5 seconds. Substituting these values into the formula, we get:
Frequency = 20 / 5 = 4 Hz
Therefore, the frequency of the wave is 4 Hz. This means that the wave completes 4 cycles or oscillations in one second.
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Please please answer this! explain the kinetic molecular theory ( i don't understand how they explain it in my lesson so if someone could simpfly it for me) worth 30 points
Answer:
Explanation:
Basically, Kinetic Molecular Theory says that gas particles are in constant motion and that they show perfectly elastic collisions.
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision.
So the kinetic molecular theory says that gas particles stay moving constantly and don't lose energy when they run into each other.
Hope this helps!
Please only answer if you are positive. Thanks! Brainliest if correct!
Answer:
They create a Mountain Peak
Explanation:
this is due in 45 minutes :,)
what you're supposed to do is put the name of the part each letter is on
Answer:
CANT SEE
Explanation:
HELP ME ASAP!!!!! This is 7th grade science! Will give brainliest, five starts, and a heart!
Choices:
o produces urine
o carries urine to the bladder
o stores urine temporarily
o excretes urine out of the body
Answer:
A- Carries urine to the bladder
B- excretes urine out of the body
C- Stores urine temporarily
D- Produces urine
What causes a earthquake
Answer:
A lot of things cause earthquakes and all of the boundaries have a play
Explanation:
Tectonic Movements: The disturbances inside the earth are called tectonic movements. ...
Volcanic Eruptions: The volcanic eruptions are often very violent and cause vibrations in the earth crust. ...
Other Reasons: The roofs of underground caves sometimes give way and release great force to cause minor tremors in the earth crust. ...
Answer: An earthquake is caused by a sudden slip on a fault. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.
Explanation:
An atom has a _____ charge.
positive
negative
neutral
Identify two structural characteristics specific to muscle tissue.
Answer:
Explanation:
Muscle cells are excitable; they respond to a stimulus.meaning they can shorten and generate a pulling force. When attached between two movable objects, such as two bones, contraction of the muscles cause the bones to move.It contains protein fibers which contract to make the cell shorter.
Answer:
excitability.
contractility
Explanation:
Hi! Can you guys help me on my Re-do test I don’t want to fail. Ten points plus Brainliest if all are correct. Thanks!
WARNING !!! i don’t know for sure but i tried my best.
1. False
2. True
3. Yes
4. Yes
5. Yes
Which of the following statement is true?
a.Energy lost is destroyed
b.Energy lost transforms to heat energy
c.Energy is never wasted
d.Energy unused is recycled in the atmosphere.
A decathlon is a combined event in athletics consisting of 10 track and field events
True false
Answer: True
This answer is true.
Answer:
true
Explanation:
Why would you be able to see the earth move if you were in space? (use the
term 'reference point in your answer)
Answer:
yes
Explanation:
If you are in space and seeing a globe that is movu ng slowly depending on your refrence point ir will move eventually. Because the eartb diffrences is easily spottable it will be noticable because of your refrence point
1. How does the structure of a hard-boiled egg compare to the crust, mantle, and core structure of Earth? What do the egg's layers represent? What might the cracks represent?
2. How do Earth's layers compare in composition and properties with the egg's layers?
3. Can an egg be used as a satisfactory model for Earth's lithosphere (plates) and asthenosphere, plus the rest of the mantle, and the core? How? (Hint: Look very carefully under the shell could the membrane there represent the asthenosphere?)
4. Overall, is the cracked egg a useful model for Earth? Why or why not?
5. Unlike the eggshell sections, Earth's plates move relative to one another. A plate may move away from another plate, or it may move toward it. Earthquakes often result from interactions between plates. Predict what other consequences might result from plate motion.
6. Of the several possible non-egg models of Earth, which do you feel is most appropriate? Why?
7. Of the several possible nonegg models of Earth, which do you feel is least appropriate? Why?
Answer:
2. Earth layers compare in egg layer it is hard on the outside
Explanation:
Answer: for 1 and 2 The inside of the earth is layered something like an egg. Both have a thin, brittle shell. The crust of the earth is broken into pieces, like the cracked shell of a hard boiled egg. The mantle of the earth is like the egg white, and the core of the earth lies in the center, like the egg yolk.
for 3 the shell could also be used because you can crack
for 5 a few things that can happen in the result of plate motion there could be Mt formation or volcano formations.
Explanation:
I hope this helps :)
2. A student tested the pH of an unknown solution and the reading
was 13.5. Which statement is true?
A. The solution is a strong base.
B. The solution is a strong acid.
C. The solution is a weak base.
D. The solution is a weak acid.
Since the pH of this unknown solution is equal to 13.5, the true statement is that: A. the solution is a strong base.
What is pH?pH is simply an abbreviation for the power of hydrogen ions and it can be defined as a measure of the molar concentration of hydrogen ions in a particular solution.
This ultimately implies that, a pH can be used to measure and specify the acidity, neutrality or basicity (alkalinity) of any chemical solution.
On a pH scale, a chemical solution with a pH of 7 is said to be neutral, a chemical solution with a pH below 7 is acidic and it's basic (alkaline) when it's pH is above 7.
In conclusion, we can infer and logically deduce that this solution is a strong base because its pH is equal to 13.5.
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Why are 75% of Earth's volcanoes in the Pacific Ring of Fire?
Answer:
these volcanoes are caused by the abundance of convergent plate boundaries around the Pacific, so D.
Explanation:
Answer:
C There are alot of subduction zones in the ring of fire
Explanation:
Anyone know the answers?
Answer:
♡ sedimentary; melting
Hope this helps :)
-ilovejiminssi♡
Which two types of particles are found in an atom’s nucleus?
neutrons and protons
electrons and photons
protons and electrons
neutrons and electrons
Answer:
protrons and neutrons
Explanation:
i took a quiz with this question and got it right
Roberto and Genevieve are trying to separate a mixture of beads using a sifter. The chart below shows the colors and sizes of the beads. What size must the holes in the sifter be to separate the red and blue beads from the yellow beads?
Answer:
2.5 mm
Explanation:
It's just big enough for red and blue to fall through but small enough that yellow will stay in
Answer:b
Explanation:
Because it look like it
Can you guys help me asap?
I'll give brainliest!!!
(PLEASE DON'T ANSWER JUST FOR POINTS)
Answer/Explanation:
1. Force / a. 6 Newtons
2. Mass / c. 125 kilograms
3. Acceleration / d. 3 m/s^2
4. Speed / b. 29 m/s
5. Velocity / e. 29 m/s East
6. Distance / f. 228 meters
Hope this helps!
Answer:
1. A) 6 Newtons
2. C) 125 kilograms
3. D) 3 m/s^2
4. B) 29 m/s
5. E) 29 m/s East
6. F) 228 meters
Anyone know the answer?
riddle of the day
What is so fragile that saying its name breaks it?
answer:
The answer to this specific riddle is silence.
-- please mark the brainliest and click the thanks button if correct :)
unlike mechanical weathering, what does chemical weathering change about a rock?
A: It's composition
B: It's shape
C: It's size
D: It's height
Answer:
A!! The chemical weathering changes all of these, But The answer is its Composition
Explanation:
A
Please help me Brainliest if correct.
Answer:
My guess is maybe A and B, Hope this helps!
Explanation:
A, Start contour plowing on slopes where landslides happen.
B, Plant vegetation on the slopes that experience landslides.
What happens to the volume and temperature of a liquid and gas when they are placed under pressure in a sealed container? Explain.
The pressure law states that for a constant volume of gas in a sealed container the temperature of the gas is directly proportional to its pressure. This can be easily understood by visualising the particles of gas in the container moving with a greater energy when the temperature is increased.
Hope this helped
The temperature an volume of liquids and gases are dependent upon the pressure of the substance. When liquid and gas particles are placed in a high pressure container then they change their medium from liquid to solid and from gas to liquid.
What is the effect of pressure on gas and liquids?
The pressure law states that for a given constant volume of gas in a sealed container the temperature of the gas in the container is directly proportional to the pressure of the gas. This can be easily understood through visualizing the particles of a gas in the container which is moving with a greater energy when the temperature is increased in the container.
Thus, when the pressure is applied on gas particles, it compresses to liquid and when the pressure is increased on liquid material, it becomes solid. The effect of pressure on solid is negligible as it does not change anything in solid. Thus, if the pressure is applied to a substance its state changes from Gas → Liquid → Solid.
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All of the following best explain why the Sun is not the only source of energy except?
1.Energy can be converted into different forms.
2.There are different sources of energy such as biological and mechanical energy.
3.There are different forms of energy other than light energy.
4.Energy can be created and destroyed.
Answer:
4. Energy can be created and destroyed
Explanation:
Reason being it tells you a part of the definition of energy while all the other answers tell you why the sun is not the only source of energy.
there are many reasons why it is important to know what type of soil surrounds you. which of the following is not one of the reasons?
A: It helps you know what to grow
B: It helps you know what you can build
C: It helps you know what will happen when it rains
D: It helps you know when a storm will come
Look at the picture below to answer. If u answer correctly i will mark you as brainliest! To answer the question use a PERIODIC TABLE OF THE ELEMENTS.
Answer: C:18
Explanation:
1.Which of the following is evidence that the Earth is round?
A. Neve's example with his magazine and apple.
B. A ship slowly appears on the horizon as it approaches
C. Earth's oceans are very deep
D. Both A and C
2. The Northern and Southern Hemispheres always have opposite seasons
A. true
B. false
Answer:
1\D. Both A and C
2\A true
Say you’re someone who’s skeptical about climate change and want to challenge the results of the studies in the video. What would you want to know more about? List some of the questions you would ask.
How do we know human activity has a stronger effect than natural forces on climate change?
What human behaviors and natural forces were evaluated in the study? Are there others to consider?
What greenhouse gases are represented in the different lines on the graph?
Were greenhouse gases from natural sources taken into account?
exact answer switch it up edmentum
How do we know human activity has a stronger effect than natural forces on climate change? What human behaviors and natural forces were evaluated in the study?
What is Climate change?Long-term changes in temperature and weather patterns are referred to as climate change. These changes could be caused by natural processes, such oscillations in the solar cycle.
Fossil fuel combustion produces greenhouse gas emissions that serve as a blanket around the planet, trapping heat from the sun and increasing temperatures.
Carbon dioxide and methane are two examples of greenhouse gas emissions that are contributing to climate change. These are produced, for instance, while burning coal or gasoline to heat a building.
Therefore, How do we know human activity has a stronger effect than natural forces on climate change? What human behaviors and natural forces were evaluated in the study?
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