A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
What is energy?Energy is a property that is transferred to a physical system, recognizable in the performance of work and in the form of heat and light.
A small sample of methane undergoes combustion. As the hot gas mixture expands, it releases energy (E).
It releases 120.0 kJ of heat. By convention, when heat is released, we assign it a negative sign. Thus, q = -120.0 kJ.It does 830.0 kJ of work. By convention, when the system does work on the surroundings, we assign it a negative sign. Thus, w = -830.0 kJ.The change in the energy is the sum of the heat released and the work done.
ΔE = q + w = -120.0 kJ + (-830.0 kJ) = -950.0 kJ
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
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Which state of matter of water is the most dense ?
A. Gaseous water vapor
B. Liquid water
C. Solid ice
D. Water and ice are equally dense.
If 86.4dm^3 of carbon dioxide gas contains N × 10^23 molecules at room temperature and pressure, find the value of N.
At T 25 ° C (298 K) and P 1 atm are stated by RTP ⇒ Vm = 24.4 liters / mol
86.4 dm³ = 86.4 L = 86.4/24.4 = 3.54 mol
1 mole = 6.02.10²³ molecules
3.54 x 6.02.10²³ = 21.31 x 10²³ molecules
N = 21.31
what is the molar mass of sucrose C12H22O11 , needed to prepare 500 mL of a sugar solution with a concentration of 0.783 mol.
Answer:
342g/mol
Explanation:
Molar mass of carbon=12, hydrogen=1 and oxygen=16
therefore C12H22O11=12(12)+22(1)+11(16)
=144+22+176
=342g/mol
Which functional group is used in other functional groups?
Explanation:
a substituent or moiety in a molecule that causes the molecule's characteristic chemical reactions
A liquid form of matter has less heat than when it is in __________ form.
solid
molecule
gas
how many grams of hno3 would you need to prepare 5.5 l of this solution
8305 grams of HNO3 would be needed to prepare 5.5L of a solution. Details on how to calculate mass is found below.
How to calculate mass?The mass of a substance in a solution can be calculated using the following formula:
Density = mass ÷ volume
According to this question, 5.5L of a HNO3 solution is given.
Density of HNO3 is 1.51 g/cm³
Volume of HNO3 = 5500mL
1.51 = mass/5500
mass = 8305g
Therefore, 8305 grams of HNO3 would be needed to prepare 5.5L of a solution.
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What can you conclude about the relationship between height and energy?
Answer:
Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.
what are two transition metals in the periodic table?
Answer:
two transitions elements are iron and cobalt
Write a summary on how to use a light microscope
DUE TODAY PLEASE HELP.
Answer:
Step 1: Connect the light microscope to a power source. If your microscope uses a mirror instead of an illuminator, you can skip this step. Instead, find a place where natural light is easily accessible
Step 2: Turn the revolving nosepiece so the lowest objective lens is in position.
Step 3: Mount your specimen onto the stage. But before doing so, see to it that your specimen is adequately protected by placing a coverslip on top of it.
Step 4: Use the metal clips to keep your slide in place. Make sure the specimen is positioned in the center, right under the lowest objective lens.
Step 5: Look into the eyepiece and slowly rotate the coarse adjustment knob to bring your specimen to focus. See to it that the slide does not touch the lens.
Step 6: Adjust the condenser for the maximum amount of light. Since you're on the low power objective, you may have to decrease the illumination. Use the diaphragm under the stage to adjust.
Step 7: Now slowly rotate the fine adjustment knob until you obtain a clearer image of your specimen.
Step 8: Examine your specimen.
Step 9: After you're done viewing with the lowest power objective, switch to the medium power objective and re-adjust the focus with the fine adjustment knob.
Step 10: Proceed to the high power objective once you have it focused.
A compound contains only aluminum and carbon. 0.03 moles of this compound reacted with excess water to form 0.12 moles of AI(OH)3 and 0.09 moles of CH4 write a balanced equation for this reaction.
Explanation:
4Al+3C+H2O→4Al(OH)3+3CH4
Balanced reaction:- 4Al+3C+HH O→4Al(OH)3+3CH4
Each of the colored lines in hydrogen's emission spectrum corresponds with the
A) energy released by the electrons as they orbit the nucleus.
B) the ionization energy of the electron when forming chemical bonds.
C) transition of an electron from a higher energy level to a lower energy level.
D) transition of an electron from a lower energy level to a higher energy level
when excited.
Each of the colored lines in hydrogen's emission spectrum corresponds with the C. transition of an electron from a higher energy level to a lower energy level.
What is an emission spectrum?An emission spectrum can be defined as the range of wavelengths, frequencies or pattern of bright lines which can be seen when the electromagnetic radiation that are emitted by an atom of a chemical compound (substance) moves through a spectrometer.
Generally, this process leads to the quantization or transfer of an electron from one energy level to another such as the transition of an electron from a energy level of higher magnitude to a lower energy level in hydrogen's emission spectrum.
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I rounded the answer but can you help me?
is ironing clothes conduction, convection or radiation
Ironing clothes is Conduction.
What is Conduction?Conduction is one of the means of Heat transfer ,others includes
Convection RadiationConduction is the transfer of heat energy from one object to another object from particles in a hotter object to particles in a cooler object, For Example: Ironing clothes is conduction.
This is because The heat from the iron which transfers to the clothes is conduction.
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The modern day three little pigs will need to choose from the following materials to build their energy efficient home: Vibranium, Beskar, and Gundarium
order for the three little pigs to be successful in building an insulated home that loses as little heat as possible, they will need to choose the materal with ta
highest specific heat, Cp-
Vibranium
Choosing the material with the highest specific heat capacity is ideal and true.
What is Specific heat capacity?This is defined as the quantity of heat needed to raise the temperature per unit mass.
Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an insulated home.
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Describe an experiment to determine rate of reaction
Answer:
Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules.
Gene therapy is a form of
.
Who is credited with arranging the periodic table?.
Russian chemist Dmitri Mendeleev
Which type of bond forms when two or more atoms share electrons?.
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
Part G
Explain how the structure of ammonium lauryl sulfate, as described in parts E and F, produces the properties identified in part C. Write a short paragraph or two.
The molecule ammonium lauryl sulfate is a detergent because of its hydrophobic tail and a hydrophilic head which are responsible for its cleansing action.
Properties of ammonium lauryl sulfateThough not shown, I presume that the property labelled as C must have to do with the cleasing action of the molecule ammonium lauryl sulfate.
The substance has a hydrophobic tail and a hydrophilic head which enables it to form miscles and these are the responsible for the cleansing action of the ammonium lauryl sulfate molecule.
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If Thomson’s atomic theory was accurate, what would the results of Rutherford’s gold foil experiment have been?
Answer:
If Thomson's atomic theory was accurate, the positively charged particles would have gone through the foil.
Which uses more energy?
Question 1 options:
Washing machine
Dryer
Answer:
What's surprising, however, is that a washing machine requires way less electricity than a dryer. An average cycle for a washing machine is 30 minutes. This appliance, which is a widely used Energy Star model, needs 500 watts per hour to run, which means it requires 250 Wh, or 2.25 kWh, to run for 30 minutes.
Answer:
[tex]I'm~here~to~help![/tex]
The correct option is B. Dryer, because a washing machine uses 1,200 or 3,000 watts on average, while a dryer uses 1,800 or 5,000 watts. That is a lot of watts!
An atom is electrically neutral because
(a) neutrons balance out the protons and electrons.
(b) nuclear forces stabilize the charges.
(c) the number of protons and electrons are equal.
(d) the numbers of protons and neutrons are equal.
Answer:
c
Explanation:
neutrons have no charge
protons and electrons have opposite charges and balance each other out in equal numbers
19.5 g of NaCl occupy a volume of 29.5 mL. What is the molarity of the solution?
Round your answer to 1 decimal space, even if sig figs are not conserved.
(Please answer quickly)
Answer:
11.3 M
Explanation:
Na = 22.989 gm/mole
Cl = 35.45 gm/mole so Na Cl = 58.439 gm/mole
(19.5 / 58.439 )/ (29.5/1000) = 11.3 M
The main purpose of the endocrine system is to produce:
A.
white blood cells.
B.
hemoglobin.
C.
neurons.
D.
hormones.
Answer:
hormones or D
Explanation:
:-)
Answer:
D. Hormones
Explanation:
Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body.
A certain gas has a volume of 500.0 ml at 77.0c and 600.0 torr. calculate the temperature if the volume decreased to 400.0 ml and the pressure is increased to 760. torr and assume the number of moles does not change.
As the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.
Given the data in the question;
Initial volume of gas; [tex]V_1 = 500.0ml = 0.5L[/tex]Initial pressure; [tex]P_1 = 600.0torr = 0.789474atm[/tex]Initial temperature; [tex]T_1 = 77.0^oC = 350.15K[/tex]Final Volume; [tex]V_2 = 400.0ml = 0.4L[/tex]Final pressure; [tex]P_2 = 760torr = 1.0atm[/tex]Final temperature; [tex]T_2 =\ ?[/tex]Combined gas lawCombined gas law brings together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
We substitute our given values into the expression above to determine the new temperature.
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\T_2 = \frac{P_2V_2T_1}{P_1V_1}\\T_2 = \frac{1.0atm\ *\ 0.4L\ *\ 350.15K}{0.789474atm\ *\ 0.5L} \\\\T_2 = \frac{140.06LatmK}{0.394737Latm}\\ \\T_2 = 354.82K\\\\T_2 = 81.67^oC[/tex]
Therefore, as the volume is decreased and the pressure is increased to the given value, the temperature of the gas increases to 81.67°C.
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The solubility of solid substances generally ___________ as temperature increases. The solubility of gaseous substances generally ___________ as temperature increases.
Gold can be found in native or pure state in nature why? Write any one anyone application of sulphur
Answer:
Sulphur is used in making car batteries and fertlizers
Answer:
Gold is almost found in its pure state. Because gold does not react with other elements or compounds easily. Elemental sulfur is used in black gunpowder, matches, and fireworks; in the vulcanization of rubber; as a fungicide, insecticide, and fumigant; in the manufacture of phosphate fertilizers; and in the treatment of certain skin diseases. The principal use of sulfur, however, is in the preparation of its compounds.
Calculate the concentration of
5 g of sugar dissolved in 20 cm of water
Answer:
25%
Explanation:
I assume you menat 20 cm^3 of water
5 gm / 20 gm = 25 %
The changes in the mass of the egg and volume of liquid in the beaker are inversely proportional. This demonstrates that _______ is moving from one area to another.
The changes in the mass of the egg and volume of liquid in the beaker are inversely proportional. This demonstrates that volume is moving from one area to another.
What is osmosis?Osmosis is a process in which solvent molecules will move from the higher concentration area to the lower concentration area.
When we put egg in any vessel where water is present then water molecule will move into the egg molecule as a result of the osmosis and due to this mass is inversely proportional to the volume. In this phenomenon water is moving from one area to another due to osmosis.
Hence volume is moving from one area to another.
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HELP ANYONE PLEASEE?? TY!!!
Answer:
so the order is grass, which gets eaten by the grasshopper, which is eaten by the frog, which gets eaten by the snake. grass wpuld be at top, snake at bottom.
Explanation:
hope this helps
In an ecosystem, the first trophic level is for grass followed by , grasshopper,snake and then frog.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by action of microbes nutrients are released back in to the soil.
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