Can anyone help me ? Tell me if it is right

Answer:

8 metal are there in modern periodic table

Answer: The bones block the x-ray particles to pass through it, and a study of the bones is possible using this technology.

Explanation:

Answer:

42.4m

Explanation:

Given parameters:

Speed of the fish = 0.8m/s

Distance  = 34m

Unknown:

Time taken for the fish to swim = ?

Solution:

Speed is the distance divided by the time taken;

     Speed  = [tex]\frac{distance}{time}[/tex]  

       Time  = [tex]\frac{distance}{speed}[/tex]  

Now, insert the parameters and solve;

        Time  = [tex]\frac{34}{0.8}[/tex]    = 42.4s

Answer:

put soil in the plastic bag.. put seeds. and add water

Explanation:

this is the right answer

Answer:

Mexico

Explanation:

external migration means move to a different country

Answer:

initial height, speed

Explanation:

Answer:

The variables for this experiment include the height of the track and the speed of the car. Use the drop-down menus to complete the sentences and identify the independent and dependent variables.

The independent variable, or the one that is intentionally manipulated, is  

✔ initial height

The dependent variable, or the one the response is measured in, is  

✔ speed

Explanation:

These were correct on edge.

Hope this helped!

Answer:

E = 8.84×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of wave = 2.25 nm (2.25×10⁻⁹ m)

Energy of wave = ?

Solution:

Formula:

E = hc/λ

c = 3×10⁸m/s

h =6.63 ×10⁻³⁴ Js

now we will put the values,

E = 6.63 ×10⁻³⁴ Js ×  3×10⁸m/s / 2.25×10⁻⁹ m

E = 19.89×10⁻²⁶ Jm / 2.25×10⁻⁹ m

E = 8.84×10⁻¹⁷ J

Answer:

By adding, a few drops of AgNO3

Dilute HCl reacts with silver nitrate to give a white precipitate of silver chloride.

On the other hand there is no reaction observed when dilute Nitric acid is treated with silver nitrate solution. That is obvious

Reactions :-

HCl(aq) + AgNO3(aq) >>> AgCl(s) + HNO3(aq)

HNO3(aq) + AgNO3(aq) >>> No reaction + No precipitate

Answer:

A

Explanation:

When the carbon dioxide concentration goes down, temperature goes down. A small part of the correspondence is due to the relationship between temperature and the solubility of carbon dioxide in the surface ocean, but the majority of the correspondence is consistent with a feedback between carbon dioxide and climate.

Answer:

Travelling hygiene

Drink only bottled water.

Don't use tap water to clean your teeth.

When you wash your hands, make sure they are totally dry before you touch any food.

Don't wash fruit or vegetables in unsafe water.

Answer:

bacic

Explanation:

it is very soluble in water

Answer:

Answers are below:

Explanation:

There are 18 groups and 7 periods in the modern periodic table. The atomic size and metallic character of elements increase down a group. Also, the atomic size and metallic character of elements decrease from left to right in a period.

Have a good night!

Answer:

I can only see b

Explanation:

Answer:

Carbon- 11 has 6 protons in its nucleus and boron- 11 has 5 protons in its nucleus.

Explanation:

note: Carbon has an atomic number of 6

and Boron has an atomic number of 5.

Answer:

636.86 K

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T1) = 333 K

Initial pressure (P1) = 4 atm

Final pressure (P2) = 7.65 atm

Final temperature (T2) =?

NOTE: The volume is constant.

Since the volume is constant, we can obtain the new temperature the gas by using the following formula as illustrated below:

P1 /T1 = P2 /T2

4/333 = 7.65/T2

Cross multiply

4 × T2 = 333 × 7.65

4 × T2 = 2547.45

Divide both side by 4

T2 = 2547.45 / 4

T2 = 636.86 K

Therefore, the new temperature of the gas is 636.86 K

Answer:

It's 637 <3

Explanation:

Round 636.86 to get 637, proven on CK12

Answer:

A. To be precise, it must be able to make measurements repeatedly over a long period of time.

Explanation:

The precision of a scientific measuring tool can be defined as how close the values between multiple measurements are to each other, when repeated under the same conditions.

This ultimately implies that, the precision of a scientific measuring tool reflects the reproducibility and repeatability of its measurements, irrespective of how accurate the measurements are.

In science, one of the most effective ways to determine the precision of a scientific measuring tool is to find the difference between the highest and lowest measurements (measured values).

Hence, the statement which correctly describes a characteristic that a scientific measuring tool should have is that, to be precise, it must be able to make measurements repeatedly over a long period of time.

Answer:

C

Explanation:

The order of abundance from greatest to least in gases found in Earth's

atmosphere is nitrogen, oxygen, carbon dioxide.

There are various gases present in the atmosphere such as nitrogen,

oxygen, carbon dioxide etc. Each of them have their important functions in

ensuring the ecosystem is balance and for survival of the organisms present.

The most abundant element is Nitrogen which accounts for about 78

percent of air. Oxygen is the second most abundant with 21 percent present

in air. Others such as carbon dioxide and inert gases represent the

remaining percentage present in air.

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Answer: C. There is more plate movement in California.

Explanation:

Answer:

A

Explanation:

Conductors allow for charge transfer through the free movement of electrons. In contrast to conductors, insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule. ... The insulator serves as a handle for moving the conductor around on top of a lab table

Answer:

1. Electrons surrounding a nucleus are attracted to the protons within it because electrons and protons have opposite charges. Electrons closest to the nucleus are attracted with such a force that they can’t escape from the atom. These electrons tend to shield the protons from electrons that are farther away because electrons have the same charge and repel each other. Electrons that are farther away have less attraction to the protons within the nucleus and are more likely to be detached from the atom.

2. Electrons can be transferred from atoms of one body to atoms of another body through friction. This can occur when one body is rubbed against another or when a liquid flows across a solid. In either case, one body may be given a positive charge while the other body is given a negative charge of the same magnitude. Both charges are developed at the same time. Electrons can also be transferred from one body to another when a charged body comes into contact with an uncharged body. The electrons move in the direction that will equalize the charges; thus, the uncharged body will be given the same charge as the charged body.

3. Free electrons move from points of negative charge to points of positive charge. When these electrons move freely from one point to another with little resistance, the material they’re traveling through is said to be a conductor. Conductors have a large number of free electrons. Insulators, on the other hand, have very few free electrons and offer great resistance to the movement of these electrons. Electric charges produced on one end of a body composed of insulating materials will most likely not spread throughout the body. In a conductor, this charge would spread throughout the entire body. Metals are generally conductors; oils, rubber, air, porcelain, and plastics are good insulators.

4. Lightning is produced by the rapid transfer of free electrons when one of the following conditions exist:

One part of a cloud is positively charged and a neighboring part of the same cloud is negatively charged.

A positively charged cloud comes near a negatively charged cloud.

A cloud with either a positive charge or a negative charge comes near the earth.

Gallium Nitrite your welcome

A binary III/V direct bandgap semiconductor called gallium nitride is ideally suited for high-power transistors that can function at high temperatures. It has been widely utilized in light-emitting diodes (LED) since the 1990s. Its chemical formula is Ga(NO₂)₃.

Blu-ray discs are read using a blue light that gallium nitride emits. Gallium nitride is also utilized in lasers, photonics, RF components, and semiconductor power devices. GaN will be used in sensor technology in the future.

Gallium nitride power amplifiers are perfect for microwave and terahertz (ThZ) devices, such as imaging and sensing, the aforementioned future market, due to their capacity to operate at significantly higher temperatures and voltages than gallium arsenide (GaAs) transistors.

To know more about Gallium nitride, visit;

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Answer:

On Sept. 15, 2020, NASA, in partnership with Future Engineers, launched the Artemis Moon Pod Essay Contest. The contest, which is open to all (public, private, and home school) students in grades K-12, asks participants to imagine they are leading a one-week expedition to the Moon’s South Pole. In the essay, students will need to describe to NASA what (and who) they would bring to help make their expedition a success.

The Moon Pod Essay Contest is presented in support of NASA’s Artemis program. The student challenge is part of NASA’s efforts to engage the public in its missions to the Moon and Mars. NASA is returning to the Moon for scientific discovery, economic benefits, and inspiration for a new generation. Working with its partners throughout the Artemis program, the agency will fine-tune precision landing technologies and develop new mobility capabilities that allow robots and crew to travel greater distances and explore new regions of the Moon.

Explanation:

Answer:

I would bring some warm clothes to keep me warm through the night because South Pole is cold. I would also bring blankets and sticks to make a fire. I would bring my bestfriend to keep me company.

Explanation:

The cell membrane allows certain items into a cell and blocks others from entering, just like a security guard protects a real factory.

Answer:

Carbon, hydrogen, oxygen, and nitrogen, with hydrogen present in the greatest proportion

Explanation:

Let's consider the chemical formula of acetaminophen: C₈H₉O₂N. According to this formula, in 1 molecule of acetaminophen there are:

As we can see, the element present in the greatest proportion by number of atoms is hydrogen.