Why are electromagnetic Waves important society today?

Answer:

20 mL

Given data:

Molarity of NaCl = 0.100 M

Volume of Pb(NO₃)₂ = 5.00 mL (5.0/1000 = 0.005 L)

Molarity of Pb(NO₃)₂ = 0.200 M

Volume of NaCl needed = ?

Solution:

Chemical equation:

2NaCl  + Pb(NO₃)₂    →      PbCl₂   +  2NaNO₃

Number of moles of Pb(NO₃)₂:

Molarity = number of moles / volume in L

0.200 M = number of moles / 0.005 L

Number of moles = 0.200 M  ×volume in L

Number of moles = 0.001 mol

now we will compare the moles of NaCl and Pb(NO₃)₂.

                         Pb(NO₃)₂       :            NaCl

                             1                 :              2

                        0.001              :         2/1×0.001 = 0.002 mol

Volume of NaCl:

Molarity = number of moles / volume in L

0.100 M = 0.002 mol / volume in L

Volume in L = 0.002 mol / 0.100 M

Volume in L = 0.02 L      

volume in mL:

0.02 L × 1000 mL/1 L

20 mL

Answer:

The inner core is solid. But the mantle is solid/plastic

Explanation:

I completed the class Earth science

Answer:

The answer on study island in the LITHOSPHERE.

Explanation:

Answer:because they run out of energy when it is transferred and to other objects, or their kinetic energy

Explanation:

Answer:

(6.3x10^23)/(6.02x10^23) = 1.047 mol Cl

The number of moles of the chlorine atoms in the 6.022 × 10²³ molecules of chlorine is equal to 2.10 mol.

Avogadro’s number can be used to express the number of entities in one mole of any substance and these units can be atoms, molecules, ions, electrons, or protons, depending upon the kind of chemical reaction or reactant and product.

The Avogadro’s constant has a numerical value approximately equal to 6.022× 10²³ mol⁻¹.

Given, the number of molecules of chlorine = 6.3× 10²³

As the one chlorine mole has chlorine atoms = 2

The number of moles of chlorine molecules in 6.3× 10²³ will be :

= 6.3× 10²³/ 6.022× 10²³ = 1.05 moles

One mole of chlorine molecules has Cl atoms = 2 moles

1.05 moles of chlorine molecules have Cl atoms = 2 × 1.05 = 2.10 mol

Therefore, the number of moles of Chlorine atoms is equal to 2.10.

Learn more about Avogadro's number, here:

brainly.com/question/11907018

#SPJ2

Answer:

Neutralizaion reaction!

Explanation:

Calciumhydroxide under Hydrochloric acid gives Calciumchloride with the formation of water.

Answer: D. gravity

Explanation:

An airplane in flight is acted on by four forces: lift, the upward acting force; gravity, the downward acting force; thrust, the forward acting force; and drag, the backward acting force (also called wind resistance).

Answer:

B

Explanation:

it uses the process of the light reaction stage and Calvin cycle to trap sunlight in the day and make food at night

Answer:

I think the answer is A or B

Answer:

K I will attempt

Explanation:

a)

[tex]O_2_{(g)}+ 2H_2_{(g)} => 2H_2O_{(l)}\\[/tex]

b)

1 : 2 : 2 (I don't know if this is what the question wants but it is what I would answer)

c)

Hydrogen because it requires 2 moles of H2 to react with 1 mole of O2

d)

24 moles of water. Look at stoichiometric coefficient. 2:2 means 24 moles you get 24 moles

e)

Oxygen. 2 < 5/2. Remember, 1 mole of O2 requires 2 moles of H2. But 5/2 is still greater than 2

f)

First, let's find out how many moles of water we can get. Since O2 is the limiting reactant, and O2:H2O ratio is 1:2, we will get 4 moles of H2O. Then, we can multiply 4 by Avogadro's number which is [tex]6.022*10^{23}[/tex] to get the number of molecules. We get: 2.41 * 10^24 molecules of water.

Answer:

I'ma just take the point thank you very much

Answer:

#1

The temperature that this happens is called the freezing point and is the same temperature as the melting point. As more energy is put into the system, the water heats up, the molecules begin moving faster and faster until there is finally enough energy in the system to totally overcome the attractive forces.

Explanation:

#2

Heating a liquid increases the speed of the molecules. An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. ... A decrease in the speed of the molecules allows the attractions between molecules to bring them a little closer together.

Answer:

The relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A.

Answer:

Relative motion is defined as the calculation of the motion of an object with regard to some other moving or static object. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.

Explanation:

Answer:

c

Explanation:

it is corundum now please follow me

Answer: corundum

Explanation: Both are made of alumina and oxygen, but they just differ in color. When a corundum is red, it is classified as a ruby, and when it’s blue, it is called a sapphire.

Answer:

B.

Explanation:

Answer:

5446.8 J

Explanation:

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

Mass (M) = 50 g

Initial temperature (T₁) = 70 °C

Final temperature (T₂) = 192.4 °C

Specific heat capacity (C) = 0.89 J/gºC

Heat (Q) required =?

Next, we shall determine the change in the temperature. This can be obtained as follow:

Initial temperature (T₁) = 70 °C

Final temperature (T₂) = 192.4 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 192.4 – 70

ΔT = 122.4 °C

Finally, we shall determine the heat required to heat up the block of aluminum as follow:

Mass (M) = 50 g

Specific heat capacity (C) = 0.89 J/gºC

Change in temperature (ΔT) = 122.4 °C

Heat (Q) required =?

Q = MCΔT

Q = 50 × 0.89 × 122.4

Q = 5446.8 J

Thus, the heat required to heat up the block of aluminum is 5446.8 J

Answer:

What pair???

Explanation:

Answer:

C is the pair that represent the isotopes of x

Answer:

I believe what your looking for is Nitrogen disulfide

Explanation:

Hope this helps (:

Answer:

Well, acutally it shouldnt..but why it should be recycled is because 1. you can use it for many nessactities such as cars and blades, and bikes

You should also recycle it for, scrap parts! so just in  case if you need recycled steel ya know where to get it

Lastly, you should recycle steel because of its value. If you recycle steel then melt it, and make well i dont know, a blade out it, you might have just made something, and then think, "Well that was fun and easy, i wanna use more recycled items to build or forge things

Explanation:

Hope this helps and pls mark brainlest!

Answer:

i think because its cause pollution

Explanation:

when making steel a lot of pollution goes in the atmosphere so if you recyle the the steel we may less pollution [ im only 12 so im sorry if this was wrong]

Answer:

The Mitochondria

Explanation:

Mitochondria are membrane-bound cell organelles that generate most of the energy required to power the cell's organic chemistry reactions. Energy created by the mitochondria is kept in a tiny molecule known as  adenosine triphosphate (ATP).

Answer:

it produces a bright yellow light and a great deal of heat energy.

Explanation:

The proton is a postitive charge, therefore, being 1 (proton) matched to positive. Whilst neutron (2) is matched to neutral. Thus electron (3) is matched to negative.

Answer:

This is false.

Explanation:

This is false because water freezes at 32 degrees faraheint and carbon would freeze at a different temperature.

Answer:

15.28 mL

Explanation:

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

Molarity of stock solution (M₁) = 4.5x10¯⁴ M

Volume of diluted solution (V₂) = 275 mL

Molarity of diluted solution (M₂) = 2.5×10¯⁵ M

Volume of stock solution (V₁) needed =.?

The volume of the stock solution needed can be obtained by using the dilution formula as illustrated below:

M₁V₁ = M₂V₂

4.5x10¯⁴ × V₁ = 2.5×10¯⁵ × 275

4.5x10¯⁴ × V₁ = 0.006875

Divide both side by 4.5x10¯⁴

V₁ = 0.006875 / 4.5x10¯⁴

V₁ = 15.28 mL

Therefore, the volume of the stock solution needed is 15.28 mL

The question is incomplete, the complete question is;

Rico is doing an experiment. He makes a solution of calcium carbonate in a beaker of 200 mL of water at room temperature (25 °C). He adds a small amount of lemon juice to the solution and a chemical reaction begins. Rico reduces the temperature of the solution by 10 °C by adding ice. As the solution cools, what will happen to the chemical reaction?  

A. The chemical reaction will stop suddenly.

B. There will be no change in the rate of the chemical reaction.

C. The chemical reaction will slow as the water cools.

D. The speed of the chemical reaction will increase as the water cools.

Answer:

C. The chemical reaction will slow as the water cools.

Explanation:

The rate of a chemical reaction is dependent on the temperature of the reaction system. This derives directly from the collision theory of chemical reaction.

The higher the temperature of the system, the more frequently the particles collide and the faster the rate of reaction.

As the temperature is decreased, the rate of reaction decreases simultaneously. Therefore, as Rico decreases the temperature from 25 degrees to 10 degrees, the rate of reaction decreases accordingly.

Answer:

Transitional Energy ......

Explanation:

Hope this helps..................................

Answer:

heat energy!!!

Explanation:

Answer:

Fe (s) + Cu^2+ (aq) + SO4^2- (aq) --> Cu (s) + Fe^2+ (aq) + SO4^2- (aq)

Explanation:

Answer:

Possibly a bad reaction as some people's immune systems are weaker than others

Explanation: