How much heat is absorbed if a 30.0 gram sample of carbon is heated from 10.5 degrees Celsius to 22.2 degrees celsius
Answer:
A lot of heat
Explanation:
Lichens, a combination of fungi and algae, grow on the surface of rocks. They secrete acids that slowly eat away at the surface of the rock.
Is this an example of chemical or physical weathering?
physical
chemical
Answer:
Chemical
Explanation:
it is a chemical weathering because it is eating away at the rock instead of actively eroding the rock.
What is the common uses for Manganese??
Cuántos gramos de cloruro de magnesio se pueden obtener si se hacen reaccionar 354,9g de cloruro de titanio (IV) y 285g de magnesio puro, Recuerde que como productos obtiene titanio y cloruro de magnesio.
a. escriba la ecuación balanceada
b. determine el reactivo limite
c. La cantidad de reactivo en exceso
Answer:
sorry I dont speak Spanish
What should be the labels on the X-axis and Y-axis?
Answer:
The label on the X-axis is Heat Supplied or Absorbed
The label on the Y-axis is Temperature
Explanation:
The given graph is the heating curve of a substance as it is absorbs heat (increase in the x-axis) and have an increase in temperature (increase in the y-axis) between its different phases, from A to E
Therefore;
The label on the X-axis should be Heat Supplied or Absorbed
The label on the Y-axis should be Temperature
An appropriate state of phase 'A' is the solid phase of the substance where the temperature of the substance increases as heat is supplied without the substance changing into a liquid
Stage 'B' is the melting stage, when the substance transforms from solid to liquid as heat is applied, without an increase in temperature, which is seen by the horizontal line of stage 'B'
At stage 'C', the substance which is entirely liquid continues to absorb heat (moving to the right), while the temperature rises
At stage 'D', the substance in the liquid state continues to absorb heat (moving to the right), but rather than increase in its temperature, the substance transforms to the gaseous phase, which is phase 'E'
At phase 'E', the substance continue to absorb heat without changing state and therefore its temperature increases
The phases 'B', and 'D', where there is no increase in temperature as heat is added (progression to the right) are the regions where we have the latent heat of fusion and evaporation respectively.
One of the main components of an airbag is the gas that fills it. As part of the design process, you need to determine the exact amount of nitrogen that should be produced. Calculate the number of moles of nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet to review the ideal gas law.
The number of moles of the gas is 0.016 moles
What is the airbag reaction?We know that in the airbag, nitrogen gas is obtained by the decomposition of sodium azide as follows; 2NaN3 -----> 2Na + 3N2
Since it is under ideal conditions;
P = 1 atm
V = 1 L
T = 495°C or 768 K
n = ?
R = 0.082 atm LK-1mol-1
From;
PV= nRT
n = PV/RT
n = 1 atm * 1 L/ 0.082 atm LK-1mol-1 * 768 K
n = 0.016 moles
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What volume of hydrogen (in L) is produced
from the complete reaction of 3.143 moles of
hydrochloric acid at STP?
Answer:
35.20
Explanation:
I got it right when I answered it
Explain why there would be a need for lithium batteries?
Answer:
The much higher power density offered by lithium ion batteries is a distinct advantage. Electric vehicles also need a battery technology that has a high energy density. ... Lithium ion cells is that their rate of self-discharge is much lower than that of other rechargeable cells such as Ni-Cad and NiMH forms.
Put this into your own words or teachers will make you redo it
Identify the type of reactions based on the reactants. Then, predict the products for the following reactions. Make sure to balance the reactions.
a. C3H8 + O2 →
b. HBr + KOH →
c. KCl + AlBr3 →
Answer:
a) C3H8 + 502 ----> 3CO2 + 4H20.
combustion reaction
b) HBr + KOH ----> KBr + H2O
Neutralization reaction
c)AlBr3 + 3 KCl----> 3 KBr + AlCl3
Redox reaction
What must happen to break a chemical bond?
Energy must be released.
Electrons must be provided.
Energy must be provided.
Answer:
Energy must be provided
Explanation:
Chemical bonds are initially stable, energy is required to break them apart.
aluminum oxide solube or insolube
Answer:
Reaction with water: Aluminum oxide is insoluble in water and does not react like sodium oxide and magnesium oxide.
pls ans quicckk two q
Answer:
there is nothing here
Explanation:
Hydrogen gas reacts with chlorine gas to form hydrogen chloride as shown in the following reaction: H2 (9) + Cl2 (g) + 2HCl (9) If a 454.4 g sample of chlorine gas (MM = 71.0 g/mol) was reacted with excess hydrogen at 565 K and 2.30 atm, how many grams of hydrogen chloride gas (MM = 36.5 g/mol) are produced? g Your answer should be rounded to three significant figures. Do not include units in your answer
Answer:
467
Explanation:
ncl2 = 454.4x1/(71.0 g/mol) = 6.40 mols cl2
6.40 mols cl2 x 2molsHCL/1moleCL2 x 36.5g/1moleHCL = 467 g HCL
One mole of chlorine gas gives two moles of hydrogen chloride. Thus, 454.4 g of chlorine gas will give 467.2 g of hydrogen chloride.
What is hydrogen chloride?Hydrogen chloride is a covalent compound formed by the electron sharing of chlorine and hydrogen. It normally exists in gaseous state and can be liquified to the acidic form.
As per the balanced reaction one mole of chlorine gas gives two moles of hydrogen chloride gas. The molecular mass of chlorine gas is 71 g/mol. The molar mass of HCl is 36.5 g/mol.
Hence, 71 g of chlorine gas gives 73 g of HCl. Then, the mass of HCl produced from 454.4 g of chlorine gas is calculated as follows:
mass of HCl = (454.4 × 73) / 71
= 467.2 g.
Therefore, the mass of HCl produced from 454.4 g of chlorine gas is 467.2 g.
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What makes up all of the populations in an area
Answer:
The number of people in that specific area.
Explanation:
What property of ocean water affects climate the most?
O A. Its salt content
B. Its density
O C. Its heat capacity
O D. Its freezing point
Answer:
c
Explanation:
if an element forms 1- ion, in which group of the periodic table would you expect to find it
Many of the elements on the periodic table will always form ions that have the same charge. The alkali metals (shown in yellow) always form +1 ions. The alkaline earth metals (red) always form +2 ions. The halogens (blue) always form -1 ions.
Answer:
the correct answer is 17
PLEASE HELP
Balance this equation.
___PH3 ——-> ___ P2 + H2
Answer:
2PH3 = P2 +3H2
Explanation:
ЗKOH + H3PO4=K3PO4 + 3H2O
what is the reaction
Answer: The given reaction is a neutralization reaction.
Explanation:
When an acid chemically reacts with a base then it leads to the formation of salt and water.
For example, [tex]3KOH + H_{3}PO_{4} \rightarrow K_{3}PO_{4} + 3H_{2}O[/tex]
Here, KOH is a the base and [tex]H_{3}PO_{4}[/tex] is an acid which on chemical reaction with each other leads to the formation of salt [tex](K_{3}PO_{4})[/tex] and water [tex](H_{2}O)[/tex].
Thus, we can conclude that the given reaction is a neutralization reaction.
please help me with questions 3, 4 & 5:)
Answer:
3 C
4 B
5 A
,...............?.
Crude oil is a liquid kind of what?
Answer:
Crude oil is a mixture of comparatively volatile liquid hydrocarbons (compounds composed mainly of hydrogen and carbon), though it also contains some nitrogen, sulfur, and oxygen. Those elements form a large variety of complex molecular structures, some of which cannot be readily identified.
How many dm3 of hydrogen are released when 3 g of potassium is reacted with hydroiodic acid?
Answer:
V = 0.0859dm³
Explanation:
Hydroiodic acid, HI, reacts with potassium, K, to produce potassium iodide, KI, and hydrogen, as follows:
2HI + 2K → 2KI + H₂(g)
To solve this question we have to find the moles of hydrogen produced knowing that 2 moles of K produce 1 mole of H₂. With the moles of hydrogen we can find the volume of hydrogen assuming there are STP conditions:
Moles K -Molar mass: 39.0983g/mol-
3g * (1mol / 39.0983g) = 0.0767 moles of K
Moles H₂:
0.0767 moles of K * (1mol H₂ / 2mol K) = 0.03836 moles H₂
Using: PV = nRT; V = nRT / P
Where V is volume in dm³,
n are moles of gas: 0.03836 moles,
R is gas constant = 0.082atm*dm³/molK
T is absolute temperature = 273.15K at STP
and P is pressure = 1atm
The volume of the gas is:
V = 0.03836mol*0.082atm*dm³/molK*273.15K / 1atm
V = 0.0859dm³A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph? volume versus pressure, because they are also directly proportional volume versus temperature, because they are also directly proportional volume versus pressure, because they are also inversely proportional volume versus temperature, because they are also inversely proportional
Answer:
b
Explanation:
gitcy is good for your spleen
The other relationship that will have a similar graph is volume versus temperature, because they are also directly proportional according to Charles's Law.
What is Charles's Law?Charles's Law is a gas law that states that the volume of a fixed mass of gas at a constant pressure is directly proportional to its absolute temperature.
This means that as the temperature of a gas increases, the volume of the gas will also increase proportionally, and as the temperature of a gas decreases, the volume of the gas will decrease proportionally.
Therefore, if a graph of gas pressure versus the number of particles in a container is a straight line, a graph of volume versus temperature will have a similar shape and be directly proportional, because they are both affected by changes in temperature.
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Which statement best describes the most likely temperatures of Portland, Oregon, and Eugene, Oregon, on this day in January?
А
Eugene was a little colder than Portland because Eugene is a little closer to the coast.
B
Portland was a little colder than Eugene because Portland is a little farther to the north.
С
Portland was much colder than Eugene because Portland was north of the polar jet stream.
a
D
Eugene was much colder than Portland because Eugene was south of the polar jet stream.
Answer: Hello, There your Answer is Below.
A. Eugene was a little colder than Portland because Eugene is a little closer to the coast.
Explanation:
Hope this Helps you!!
Have a great day!!!
Help Plz
How does temperature relate to energy?
Answer:
temperature a measurement of the average amount of energy PER UNIT OF STUFF
Heat Energy is TOTAL ENERGY IN THE STUFF
So, that's why the difference. If you have two things at the same temperature, then any one mole (which is the same as how many molecules or atoms it takes to make up the molecular weight of something in grams.. so one mole of Hydrogen weighs 1 gram, 1 mole of helium weighs 2 grams, 1 mole of Gold weight 196 grams) of the stuff will have the same amount of energy as one mole of the other stuff. If you measure by total mass though, then you realize that there are more water molecules than gold ones in the same volume of stuff, and heat is about volume and molecular density, not mass.
This is why some Stirling engine folks who have made solar plants use Helium as the working gas.. it contains a huge amount of heat for its volume (also because it is very compressible)
So.. Delta Q goes with moles, not mass.
What is the chemical name of Ca3H2?
Answer:
it should be calcium hydrate
One is a negative environmental consequence of surface mining?
Answer:
Surface mining (also known as "strip mining") has the potential to significantly erode soil fertility, pollute waters, deplete underground water sources, scar or altar the landscape, damage roads, houses, and other buildings, and kill wildlife.
What three temperature measurements Inust you make to calculate the specific heat of a sample using a calorimeter?
Answer:
Explanation:
Heat and temperature are two different but closely related concepts. Note that they have different units: temperature typically has units of degrees Celsius ( ∘ C ^\circ\text C ∘Cdegrees, start text, C, end text) or Kelvin ( Kstart text, K, end text), and heat has units of energy, Joules ( Jstart text, J, end text).
Justify the
the importance of solar enengy as on
alternative source of energy in Nepal
Answer:
Nepal aims to achieve universal access to clean, reliable and affordable renewable energy solutions by 2030. It is expected to reduce dependence on traditional and imported energy by increasing access to renewable energy. The use of solar energy is more reliable than traditional electricity in Nepal.
According to law of conservation of energy,solar energy is a renewable source of energy as it's heat can be converted to other forms of energy and can be conserved and is being looked as an alternative in Nepal.
What is law of conservation of energy?According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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What is the velocity of a wave with a wavelength of 0.03 m and a frequency of
120 Hz?
A. 0.28 m/s
B. 4000 m/s
C. 3.6 m/s
D. 2.5x 10-4 m/s
Answer:
A
Explanation:
Got a calculation of 8.05297
Answer:
C. 3.6 m/s
Explanation:
I just took a test on a-pe-x and it was correct! :)
What is the molarity of a solution prepared by dissolving 35.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters?