Chemistry help!

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Answer:

2.0

Explanation:

Answer:

A volcano has no friends only heat.

Explanation:

Answer:

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

Explanation:

The graph is a graph of the solid, liquid, vapour phase change diagram.

In phase 1, the substance is ice which is the solid phase.

In phase 2,it undergoes melting in a forward reaction.

In phase 3, the melting from phase 2 has now changed to water which is liquid phase.

In phase 4, the substance is undergoing a forward reaction known as evaporation.

In phase 5, the evaporation from stage 4 will turn the liquid into vapour known as the gas phase.

A) The substance is in the gas phase only in "region 5".

B) The substance is in both the liquid and solid phase in "region 2"

C) The substance is only in the liquid phase in "region 3".

D) The melting point is the temperature at "region 2".

E) The boiling point is the temperature at "region 4".

The change of state of a substance occurs when heat is either added or removed from the substance.

Change of state is a process in which a substance changes from one state of matter to another due to heat changes.

From the graph given:

Learn more about change of state at: https://brainly.com/question/9007095

#SPJ5

Answer:

1. i think its II or III

2. air

Explanation:

Answer:

cardiac

Explanation:

Answer:

14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.

Explanation:

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to Q = m*L, where L is called the latent heat of the substance and depends on the type of phase change.

During the evaporation process, a substance goes from a liquid to a gaseous state and needs to absorb a certain amount of heat from its immediate surroundings, which results in its cooling. The heat absorbed is called the heat of vaporization.

So, it is called "heat of vaporization", the energy required to change 1 gram of substance from a liquid state to a gaseous state at the boiling point.

In this case, being:

and replacing in the expression Q = m*L you get:

Q=172 g*84 [tex]\frac{J}{g}[/tex]

Q=14,448 J

14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.

Answer: the answer is D the last one.

Explanation:

hope this helps! have a good day! :) ^-^

Answer:

1. 2Na + 2HCl = 2NaCl =H2

2. 2Mg + O2 = 2MgO

Explanation:

make sure that the number of atoms of each element is the same on each side of the equation  

1. 2Na + 2HCl = 2NaCl =H2

on LHS of equation,

Na = 2

H = 2

Cl =2

On RHS of equation,

Na=2

H= 2

Cl =2

2. 2Mg + O2 = 2MgO

on LHS of equation,

Mg = 2

O2 = 2

On RHS of equation,

Mg = 2

O2 = 2

Answer:

b, decrease in movement of the molecules

Explanation:

removing the energy will begin making the molecules lock up and stop moving due to the loss of energy.

hope this helped

Answer:

survival and defense......... plz mark me brainliest

Answer:

2800 g de ácido nítrico

Explanation:

La ecuación por la oxidación de amoniaco es:

4NH₃  +  7O₂  →  4H₂O  +  2HNO₂  +  2HNO₃

Si pensamos que el oxígeno es el reactivo limitante, trabajamos con el amoniaco. Convertimos su masa a moles:

1.36 kg = 1360 g

1360 g . 1mol  /17g = 80 moles

Si 4 moles de amoniaco pueden producir 2 moles de acido nítrico

80 moles producirán, (80 . 2)/4 = 40 moles.

Convertimos los moles a gramos:

40 mol . 63g /mol = 2520 g

Si le aplicamos la pureza

2520 g . 100/90 = 2800 g

The line starts at the bottom because it's the starting point. (You have to start somewhere, If that makes sense.)

I also noticed that the line is going up, which means she's going farther (in distance and time)

Answer:

17.18

Explanation:

(1 in = 2.54 cm; 12 in = 1 ft)

Formula:- Divide the length value by 30.48

523.7 ÷ 30.48 = 17.181

Thus, The answer is 17.181

-TheUnknownScientist

Answer:

17.18

Explanation:

I hope its helpful......

Answer:

3) The People

Explanation:

Members Of Congress In Both Houses ( Democrats And Republicans ) Are Elected By Direct Popular Vote. Senators Are Elected Via A Statewide Vote ( The People All Around The World ) And Representatives Are Elected By Voters In Each Congressional District.

Answer:

c

Explanation:

i just took the test

Answer:

0.1g (Gallon) of chlorine

Explanation:

Formula

1 gallon = 3.7L; the density of water is 1.0g/ml

Given

2g (gallon) of chlorine to sanitize = 1,000,000g (gallon) of water

Solve

If 2g (gallon) chlorine = 1,000,000g (gallon)

∴, ? chlorine = 40,000

The First step; set up an equation

1000000/2 = 40000/?

The Next step; divide 1 million to 2

1000000 ÷ 2 = 500000

Then, divide the result by 40000

40000 ÷ 500000 = 0.08

In the nearest unit that is 0.1

Therefore, it will take 0.1g (gallon) of chlorine to sanitize a 40,000-gallon pool.

Answer:

296

Explanation:

1 gallon = 3.7 L

40,000 gallon

= 40,000 × 3.7

= 148,000 L

1 g = 1 / 1000 L

1,000,000 g

= 1,000,000 / 1000

= 1,000 L

Let x be the amount of chlorine that will it take to sanitize a 40,000-gallon pool.

2 : 1,000 : : x : 148,000

2 / 1,000 = x / 148,000

x × 1,000 = 2 × 148,000

x = ( 2 × 148,000 ) / 1,000

= 2 × 148

x = 296 g

Therefore,

296 g of chlorine will it take to sanitize a 40,000-gallon pool.

( I solved using maths )

Answer:

I think ithe answer is it is free

hope this helps

Answer:

Yes yes i have.

Explanation:

Dont quite understand the way you worded the sentence but ok-

did u ever think that rocks could be squishy and when something touches them they become hard?

or that if we cant see wind...can fish not see water?

Answer:

I'm pretty sure its D

Explanation:

they have uncontrolled growth

Answer:

1, mass is like how big it appears and weight could be small and be more weight then something with alot of mass

2,  sorry i dont know

3, Jupiter you would weigh the most and the least is mars

4, the sun and if it was changed all the plants would eventually collide and go out of order

5, gravity, electricity and magnetism

Explanation:

The law of conservation of mass states that. “The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”. According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.

I’m pretty sure that when balancing a chemical equation no one is thinking about the conservation of mass. It’s all about counting atoms. When you have the same number of each kind of atom on either side of the arrow, then the equation is balanced. Now, that’s not to dismiss the law of conservation of mass which is verified upon closer inspection of the balanced equation.

eg CH4 + O2 → CO2 + H2O - needs balancing.

you use the idea that each type of atoim is conserved - so looking at this you can see it is not currently correct. On the LHS there are 2 O atoms and on the RHS there are 3 O atoms- the number of atoms must remain unchanged. We dont bother about their mass ( although mass is conserved)’

sino niloko mo hindi anko aronong ng sam

Answer:

Cinder cone-made of pieces of lava

caldera-bowl-shaped depression

volcanic soil-rich in nutrients

lava plateau-material fills in valleys

shield volcano-wide summit, gentle slope

Explanation:

Just did it

Answer: See image

Explanation: match the landform to its description

Answer:

activation energy

the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction.

effective collisions

An effective collision is defined as one in which molecules collide with sufficient energy and proper orientation, so that a reaction occurs.

ineffective collisions

An ineffective collision (A) is one that does not result in product formation. An effective collision (B) is one in which chemical bonds are broken and a product is formed.

Answer:

14°C

Explanation:

In order to use the ideal gas law, you need the number of moles of N2 present.

30.1 g x (mol / 28.02 g) = 1.07 mol N2

Use the ideal gas law: PV = nRT

Now isolate for T(temperature) and plug in your other values:

T = PV / nR

T = (25.2 atm)(1.00 L) / (1.07 mol)(0.08206)

T = 287 K

T(°C) = 287 K - 273 K = 14°C

Therefore, the temperature is 14°C

Answer:

Deciduous forests

Explanation:

Answer:

C is the answer!

Explanation:

temperature is a measurement of the average kinetic energy of the particles in an object

Answer:

it is analog signal, your welcome

Answer:

Analoge

Explanation:

Analog signal

Answer:

False, 17.03*10 = 170.3g not 17