Answer:
B. Hess's law states that the enthalpy of a reaction does not depend
on the reaction path.
Explanation:
When you remove energy from a substance there will be a *
A. Increase in movement of the molecules
B. Decrease in movement of the molecules
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
Balance the following equations
1.Na+HCI=NaCI+H2
2.Mg+O2=MgO
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
The mass of 10 moles of ammonia is 17 grams true or false
Answer:
False, 17.03*10 = 170.3g not 17
Using dimensional analysis, convert 523.7 cm into feet. (1 in= 2.54 cm; 12 in=1 ft)
-15962
-2471
-17.18
-43.64
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......
pls help will give 20 points and brainliest!!! im desperate!!
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)
The line is straight which means she's going constant speed.Will mark brainly
ASAP
TRy to solve both pls
Answer:
1. i think its II or III
2. air
Explanation:
Well did u ever wonder what's invisible but you wish people could see
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?
The muscle that pumps blood throughout your body is:
Cardiac muscle
Valentine muscle
Skeletal muscle
Smooth muscle
Answer:
cardiac
Explanation:
Why might an organism have more than one arrow coming from them in the food web
Chemical reactions follow the law of conservation of mass. This is seen on paper as a balanced equation. Explain the law of conservation of mass and how to balance an equation.
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
The heat of vaporization of a liquid is 84.0 J/g. How many joules of heat would it take to completely vaporize 172 g of this liquid at its boiling point?
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:
Q=?m= 172 gL= 84 [tex]\frac{J}{g}[/tex]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.
HELPP asap I’ll mark you as brainlister
Answer: the answer is D the last one.
Explanation:
hope this helps! have a good day! :) ^-^
Who elects or appoints Representative and Senators?
(Marking brainliest for the quickest correct answer!)
1) the president
2) the electoral college
3) The people
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.
what do you think this plant has spikes for, survival, reproduction or defense?
Answer:
survival and defense......... plz mark me brainliest
What does temperature measure?
A. Degrees within molecules
B. Pressure within molecules
C. Kinetic energy within molecules
D. Potential energy within molecules
SUBME
Answer:
C is the answer!
Explanation:
temperature is a measurement of the average kinetic energy of the particles in an object
58. What is the temperature if 30.1 g of N, in a 1.00-L container is at a pressure of 25.2 atm?
DUE TONIGHT. LINKS DONT WORK SO PLS SHOW WORK. THANK YOU SO MUCH
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
Iron reacts with Oxygen gas to form Iron II Oxide according to the reaction
below.
4 Fe
+ 3 02
2 Fe2O3
How many moles of Iron II Oxide can be produced from 347.7 L of Oxygen gas at a temperature
of 74.3 °C and a pressure of 294.5 kPa?
Round Answers to 0.01 decimals
Answer:
2.0
Explanation:
How do cancer cells differ from normal cells? Select all that apply.
A
they do not stop at checkpoints
B
they condense their DNA into chromosomes for cell division
C
they go through the S phase
D
they have uncontrolled growth
Answer:
I'm pretty sure its D
Explanation:
they have uncontrolled growth
giving 15 points + brainliest to the correct answer
pic is attached
no scams and links pls
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 diagram represents a wave pattern in a certain medium. Answer the following questions based on the diagram.
Referring to Figure 23-2A, the wavelength in the diagram is represented by the distance from:
Answer:
c
Explanation:
i just took the test
El acido nitrico se obtiene industrialmente por oxidacion de amoniaco (nh3), de acuerdo con la ecuacion: 4nh3 + 702 - h2o + hno2 + 2hno3 ¿ cuanto acido nitrico del 90% de pureza se podra obtener a partir de 1.36 kg de amoniaco?
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
Match the landform to its description.
People Who Answer First And Got This Right, Will Be Mark As Brainilist!
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
please help ASAP!! please someone!
Complete the statements by writing the number
from the graph.
Temperature vs. Time
The substance is in the gas phase only in region
The substance is in both the liquid and the solid
phase in region
Temperature (°C)
3
400
360
320
280
240
200
160
120
80
40
0
-40
The substance is in only the liquid phase in region
The melting point is the temperature at region
2
The boiling point is the temperature at region
-80
DONE
Time (min) →
Intro
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.
What is change of state?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:
The substance is in only the liquid phase in region 3.The subsybece is both in the liquid and solid phase at region 2.The melting point is the temperature at region 2The boiling point is the temperature at region 4The substance is in the gas phase only at region 5.Learn more about change of state at: https://brainly.com/question/9007095
#SPJ5
please help me with the definition of
activation energy
effective collisions
ineffective collisions.
please
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.
The main advantage of solar energy is:
It has very little pollution.
It is free.
It can be used all the time.
It is low in cost.
Answer:
I think ithe answer is it is free
hope this helps
Some species of hares are brown most of the year, but change color to white in the winter. This allows them to blend in
through the seasons.
Where are these organisms adapted to live?
O deciduous forests
o desert
tropical rain forests
savanna
Answer:
Deciduous forests
Explanation:
It takes 2 g of chlorine to sanitize 1,000,000g of water. How much chlorine will it take to sanitize a 40,000-gallon pool? ( 1 gallon =3.7L; the density of water is 1.0g/ml ) Show your work
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 )
A volcano has no ____
only heat.
Answer:
A volcano has no friends only heat.
Explanation:
3) Pick the correct definition for : A signal represented by a continuous wave *-1 analog signal-2 digitized siganal-3-encode-4-transmit-5-wave pulse.lzz help
Answer:
it is analog signal, your welcome
Answer:
Analoge
Explanation:
Analog signal
BRAINILIEST PLEASE