How many electrons should Nitrogen (N) have around its Lewis dot model?

Answer:

The wheel size does not affect the speed of the skateboard.

Explanation:

This is true because Nikki's average time goes up while Lisa's goes down, so it depends on how hard they are pushing the skateboard with their foot.

Answer:

1.55×10²² molecules.

Explanation:

We'll begin by calculating the number of mole in 5.32 g of pure lead (Pb). This can be obtained as follow:

Mass of Pb = 5.32 g

Molar mass of Pb = 207 g/mol

Mole of Pb =?

Mole = mass /molar mass

Mole of Pb = 5.32/207

Mole of Pb = 0.0257 mole

Finally, we shall determine the number of molecules in 0.0257 mole of Pb. This can be obtained as follow:

From Avogadro's hypothesis,

I mole of Pb contains 6.02×10²³ molecules.

Therefore, 0.0257 mole will contain = 0.0257 × 6.02×10²³ = 1.55×10²² molecules.

Therefore, 5.32 g of pure lead (Pb) contains 1.55×10²² molecules.

Answer:

A) oxygen moles/sec = 48 * 10 ^-14  mol/sec

B) mass of oxygen = 1536*10^-14 grams

Explanation:

cross sectional area of cylinder = 2cm^2 = 2 * 10^-4 m^2

length of cylinder = 5 cm = 0.05 m

concentration at one end = 0.2 mol m^-3

concentration falls linearly at other end = 0.05 mol m^-3

Diffusion constant of oxygen = 8 * 10^-10  m^2 s^-1

A ) Number of moles of oxygen passing every second

 N = A * D * [tex]\frac{dc}{dt}[/tex]   ------- ( 1 )

A = area , D = diffusion constant,  [tex]\frac{dc}{dt}[/tex] = rate of change of diffusion

dc /dt = ( 0.2 - 0.05 ) / 0.05  = 3 mol m^-4

back to the equation

N = ( 2 * 10^-4 ) * ( 8 * 10^-10 ) * ( 3 ) = 48 * 10 ^-14  mol/sec

B) Mass of oxygen passing down the cylinder each second

This can be obtained by converting : 48 * 10^-14 moles to grams

1 mole of oxygen  =  32 grams of oxygen

therefore : 48 * 10^-14 moles of oxygen = ( 32 * (48*10^-14) = 1536*10^-14 grams

Answer:

Since human wants are unlimited, and resources used to satisfy those wants are limited - there is scarcity. Even in the US, one of the richest countries in the world, there is scarcity -- if we use our new definition of SCARCITY.

hope it helps

Answer:

For number 5 it is the 2nd one some stants has a mass of 1.25 g And the 2nd 1 number 6It is the 1st 1A subject has a melting point of 40

Answer:

compounds have the same properties the elementary are false.

Answer:

anong sagot jan? d ko kasi alam ehhh penge sagot

One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.

The term greenhouse gases refers to those gases that lead to a rise in the temperature of the earth due to the re-radiation of infrared rays towards the surface of the earth.

It is very important to take vital steps in order to prevent the emission of these gases. One of the most effective ways to reduce greenhouse gases is using a car powered by fuel cells.

Learn more about greenhouse gases: https://brainly.com/question/14131369?

Answer:

Using a car powered by fuel cells

Explanation:
B On Edge

Answer:

Where can you find most of Earth's liquid freshwater?

Explanation:

Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps.

Hope that helped, i also have snap if you need me.

Over 68 per cent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 per cent is found in groundwater. Only about 0.3 per cent of our freshwater is found in the surface water of lakes, and rivers.

The Earth is a watery place. About 71 per cent of the Earth's surface is water-covered, and the oceans hold about 96.5 per cent of all Earth's water.

The majority of Earth’s fresh water is stored in underground aquifers.

Aquifers are layers of sedimentary formations such as sandstone and fractured hard rocks where water after infiltration from soil reaches and fill the interstitial spaces.

Aquifers are huge in size in basins and contain a huge amount of underground water of fresh quality.

So, over 68 per cent of the freshwater is present on Earth.

Learn more about the freshwater here:

https://brainly.com/question/4381433

#SPJ2

Answer:

alkali metals

Explanation:

s block elements are also called alkali metals

Atoms contain positively charged protons and negatively charged electrons. The atoms contain the same number of protons and electrons so the positively charged protons balance out the negatively charged electrons. Therefore, an atom is electrically neutral because it has no charge.

Answer:

Ammonia reacts with sulphuric acid to give the fertilizer ammonium sulphate.

Explanation:

Answer:

Explanation:

To find the concentration of new solution we use the formula

[tex]C_1V_1 = C_2V_2[/tex]

where

C1 is the concentration of the stock solution

V1 is the volume is the volume of the stock solution

C_2 is the concentration of the diluted solution

V2 is the volume of the diluted solution

Since we are finding the the concentration of new solution

[tex]C_2 = \frac{C_1V_1}{V_2} \\[/tex]

From the question

C1 = 0.575 M

V1 = 298 mL

V2 = 750 mL

We have

[tex]C_2 = \frac{0.575 \times 298}{750} \\ = 0.228466666...[/tex]

We have the final answer as

Hope this helps you

Explanation:

Because when you move the decimal point once, it it equal to 10 and to convert in the metric system, you must multiply or divide by 10. For example, when converting 4 centimeters to millimeters, you can multiply by 10 to get 40 millimeters or you can move the decimal point to the right and add another 0 to get 40.

Answer:

when you move tne decmal point it alwase ads up to ten

Explanation:

Answer:

no

their made from the earth

I'm pretty sure its momentum

Answer:

13.39

Explanation:

Density is g/mL divide the grams by the mL

Answer:

it's A. if the force of gravity is greater than the buoyant force, the object will sink.

Explanation:

just took the quiz on a p e x

Answer:

Explanation:

Answer:

Q = 126.5 kJ

Explanation:

Given that,

Mass, m = 1210 g

Specific heat of water, c =  4.184 J/g°C

Initial temperature, [tex]T_i=20^{\circ} C[/tex]

Final temperature, [tex]T_f=45^{\circ} C[/tex]

We need to find the heat absorbed by water. The formula that is used to find the heat absorbed is given by :

[tex]Q=mc\Delta T[/tex]

Putting all the values in it we get :

[tex]Q=1210\ g\times 4.184\ J/g^{\circ} C\times (45-20)^{\circ} C\\Q=126566\ J\\\\\text{or}\\\\Q=126.5\ kJ[/tex]

So, the amount of heat absorbed is 126.5 kJ.

Answer:

I dont lnow much about chemistry, but I believe it's either d or a. sorry if its wrong!

Answer:

the answer is HYPOTHESIS your welcome

Explanation:

Answer:

This should help :)

Explanation:

The cart has a lot of potential energy, little kinetic energy, and little thermal energy when it is in position A. The kinetic energy and potential energy both rise as the cart moves towards position B, while the thermal energy rises as thermal energy from the track is transmitted to the cart through friction

Kinetic energy, which may be seen in the movement of an object, particle, or group of particles, is the energy of motion.

The cart has a lot of kinetic energy, little potential energy, and little thermal energy after it reaches position C. The cart has some thermal energy and a high potential energy at point D.

It also has a low kinetic energy. Gravity, momentum, and friction are all connected with potential energy, kinetic energy, and thermal energy, respectively.

Position A is when the potential energy is at its highest, and its kinetic energy is at its peak in position C and at its lowest in position A, whereas thermal energy is at its peak in position B and at its lowest in position A.

To learn more about Kinetic energy, refer to the below link:

https://brainly.com/question/999862

# SPJ2

Answer:

It's probably C

The forces between liquid particles are weaker than the forces between solid particles. This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container

Sorry if the answer is wrong!!!!!!

Answer:

C

Explanation:

[Ne]3s23p1

Answer:

C

Explanation:

Answer:

Its B

Explanation:

Because im just built different

The statement  featuring the single replacement reaction has been statement B.

The single replacement reaction has been defined as the reaction of the highly reactive element with the compounds, that results in the formation of the new compound with the replacement of the less reactive element.

The single replacement reaction can be given as:

G + XY [tex]\rightarrow[/tex] GY + X

In the reaction, G being more reactive than X has been able to displace X and forms bond with Y. Thus, statement  featuring the single replacement reaction has been B.

For more information about the single replacement reaction, refer to the link:

https://brainly.com/question/8625202

Answer:

Irrational

Explanation:

:)

Answer:

It is irrational

Explanation:

Since 7 is a prime number, it has no square factors and its square root cannot be simplified.

355 volcanoes in the Philippines are inactive.

24 volcanoes are active

Answer:

TAAL ACTIVE

MAOUNT BALUGAO INACTIVE

Explanation:

Answer:

the answer is {organisms}

Answer:

organisms

Explanation: I took the test