Answer:
use a calculator please
Answer:
250,000
Explanation:
8. How much enthalpy/heat is transferred when 0.5113
gof ammonia (NH3) reacts with excess oxygen according
| to the following equation:
4NH3 +502 - 4N0+ 6H20
AH = -905.4J
When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.
What is enthalpy?Enthalpy, a property of a thermodynamic system, is the sum of the system's internal energy and the product of its pressure and volume.
Step 1. Write the thermochemical equation.4 NH₃(g) +5 O₂(g) ⇒ 4 NO(g) + 6 H₂O ΔH = -905.4J
Step 2. Convert 0.5113 g of NH₃ to moles.The molar mass of NH₃ is 17.03 g/mol.
0.5113 g × 1 mol/17.03 g = 0.03002 mol
Step 3. Calculate the heat released by the reaction of 0.03002 moles of NH₃.According to the thermochemical equation, -905.4 J are released upon the reaction of 4 moles of ammonia.
0.03002 mol × (-905.4 J/4 mol) = -6.795 J
When 0.5113 g of ammonia react with excess oxygen, -6.795 J of heat are released.
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A gas has an empirical formula CH4. 0.16g of the gas occupies a volume of 240cm^3 What is the molecular formula of the gas???.
Help me anyone who know!!!
Explanation and answer:
The molar volume of a gas is 22.4 L at 0 deg. C.
So the molar mass of the gas is, by proportion,
0.16 g * (22400 mL)/(240 mL) = 14.93 g
The molar mass of (CH4)n = 12+4(1) = 16.
So n = 15.93/16 = 1, or the molecular formula is CH4.
Note: The temperature at which the volume was observed was not given. If 240 cm^3 was observed at 20 deg.C, then the volume at 0 deg.C would be
V=240*(273+0)/(273+20) = 223.6
The molar mass = 0.16*22400/(223.6) = 16.03
which gives n = 16/16.03 = 1 again, but more accurately.
Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass
Answer:
Mass and distance affect the gravitational attraction between objects.
Explanation:
Answer:
Its Mass
Explanation:
How does the atmosphere help to make Earth livable? Check all that apply.
causes the seasons
contains oxygen
provides warmth
creates important nutrients
blocks harmful energy from the Sun
Plz help like ASAP!!!
Answer:
- contains oxygen
- provides warmth
- blocks harmful energy from the Sun
Explanation:
The atmosphere is crucial when it comes to providing living conditions on Earth. The gases in the atmosphere manage to balance the things just about right, so that the life can thrive. The atmosphere has oxygen, the gas that is used by pretty much every organism to be able to function. With its greenhouse gases, the atmosphere manages to trap the heat inside, thus providing warmth to the Earth. The numerous layers of the atmosphere manage to block in big portion the harmful energy from the Sun, with a special accent on the ozone layer, a layer that manages to stop most of the UV radiation.
Answer: Contains oxygen, provides warmth, blocks harmful energy from the Sun
Explanation:
it they main important to live on earth
In a reaction equation, where are the products located?
A.) above the arrow
B.) to the right of the arrow
C.) to the left of the arrow
D.) below the arrow
This is how a reaction equation is set up:
Reactants ------> Products
This means that the answer is B) Products are located to the right of the arrow (aka the yield)
Hope this helped!
~Just a girl in love with Shawn Mendes
A fish has armored plates that enable it to handle the extreme pressure in the deepest, darkest aquatic ecosystem.
Where is this fish adapted to live?
Answer:
the open ocean
Explanation:
i just took the test on edge
1s22s22p63s23p64s23d104p5 Which element is this?
Explanation:
As the given electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}[/tex]. This shows that there are in total 35 electrons and 7 valence electrons.
Also, we know that bromine is the element that has atomic number 35. And, since it belongs to group 17 so it has 7 valence electrons.
Thus, we can conclude that the given element is bromine.
The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine. This can be deduced by counting the total number of electrons, which is 35. Bromine is in Group 17 and Period 4.
The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ is Bromine (Br). To determine this, you can count the total number of electrons, which add up to 35. Bromine is located in Group 17 (VIIA) and Period 4 of the periodic table.
Here is a breakdown of the electron configuration:
1s²: 2 electrons2s² 2p⁶: 8 electrons3s² 3p⁶: 8 electrons4s² 3d¹⁰ 4p⁵: 17 electronsAdding these up results in a total of 35 electrons, confirming it is Bromine.
Complete Question - What is the element with the following electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?
Final answer:
To fully react with 12.8 moles of magnesium bromide in a single displacement reaction, 25.6 moles of potassium are needed, based on a typical reaction where 2 moles of potassium react with 1 mole of magnesium bromide.
Explanation:
To answer the question, of how many moles of potassium are needed to react completely with 12.8 moles of magnesium bromide, we need to reference the chemical equation that describes the reaction between potassium (K) and magnesium bromide (MgBr₂). However, without the specific reaction provided, a direct stoichiometric relationship is difficult to establish. For simplicity, let's assume a common type of reaction where potassium displaces magnesium from magnesium bromide, which is a single displacement reaction.
In a typical displacement reaction, potassium would react with magnesium bromide to form potassium bromide (KBr) and free magnesium (Mg). The equation might look something like 2 K + MgBr₂ → 2 KBr + Mg. Here, you can see that 2 moles of potassium react with 1 mole of magnesium bromide. Therefore, to react with 12.8 moles of MgBr₂, you would need 2 times that amount of potassium because the molar ratio of K to MgBr₂ is 2:1.
So, 25.6 moles of potassium are needed to react with 12.8 moles of magnesium bromide. It's important to remember that this answer is based on the assumption of a specific reaction type, and actual reactions may vary.
A student completes a titration by adding 12.0 milliliters of NaOH(aq) of unknown concentration to 16.0 milliliters of 0.15 M HCl(aq). What is the molar concentration of the NaOH(aq)?
1)5.0 M
2)0.20 M
3)0.11 M
4)1.1 M
12×C(NaOH)=16×0.15
C(NaOH)=(16×0.15)÷12=0.2
Answer: 2) 0.20M
Which structural formula represents a molecule that is not an isomer of pentane?
нннн
н-с-с-с-с-н
ннннн
н-с-с-с-с-с-н
н нннн
н
н-с-н
н-с-с-с-н
н- с-н
Hн
II-0-І І
——-т
х-О-ІІ
Submit Answer
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An isomer of pentane has the same molecular formula but different structure. Pentane has three isomers. Structural formula H-C-C-C-H represents propane, which is not an isomer of pentane due to having a different molecular formula.
Explanation:An isomer is a compound with the same molecular formula but a different structure. Pentane is an organic compound with the molecular formula C5H12 and has three isomers. These isomers are 2-methylbutane (also known as isopentane) and 2,2-dimethylpropane (also known as neopentane).
The structural formula that does not represent an isomer of pentane would be the one with a different molecular formula such as H-C-C-C-H which represents propane, a hydrocarbon with the molecular formula C3H8. Propane is not an isomer of pentane as it has a different molecular formula hence a different number of carbons and hydrogens.
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You have a 15.0 gram sample of gold at 20.0°C. How much heat does it take to raise the temperature to 100.0°C?
Answer:
=154.8 J
Explanation:
The rise in temperature is contributed by the change in temperature.
Change in enthalpy = MC∅, where M is the mass of the substance, C is the specific heat capacity and ∅ is the change in temperature.
Change in temperature = 100.0°C-20.0°C=80°C
ΔH=MC∅
The specific heat capacity of gold= 0.129 J/g°C
ΔH= 15.0g×0.129J/g°C×80°C
=154.8 J
35. In the collision theory, a collision that leads to the formation of products is called an
_.(2 words)
Answer:
It's Effective Collision.
Explanation:
Hope my answer has helped you!
How many liters of oxygen gas, at standard
temperature and pressure, will react with 35.8 grams of
iron metal?
4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)
Answer:
Explanation:
For the balanced reaction:4Fe(s) + 3O₂(g) → 2Fe₂O₃(s).
It is clear that 4 mol of Fe react with 3 mol of O₂ to produce 2 mol of Fe₂O₃.
Firstly, we need to calculate the no. of moles of 35.8 grams of Fe metal:no. of moles of Fe = mass/molar mass = (35.8 g)/(55.845 g/mol) = 0.64 mol.
Now, we can find the no. of moles of O₂ is needed to react with the proposed amount of Fe:Using cross multiplication:
4 mol of Fe is needed to react with → 3 mol of O₂, from stichiometry.
0.64 mol of Fe is needed to react with → ??? mol of O₂.
∴ The no. of moles of O₂ needed = (3 mol)(0.64 mol)/(4 mol) = 0.48 mol.
Finally, we can get the volume of oxygen using the information:It is known that 1 mole of any gas occupies 22.4 L at standard P and T (STP).
Using cross multiplication:
1 mol of O₂ occupies → 22.4 L, at STP conditions.
0.48 mol of O₂ occupies → ??? L.
∴ The no. of liters of O₂ = (0.48 mol)(22.4 L)/(1 mol) = 10.752 L.
An electron has _____.
far less mass than either a proton or a neutron
more mass than a proton or a neutron
no mass at all
about the same mass as a proton or a neutron
Answer:
Your answer is A. far less mass than either a proton or a neutron
I am 10000% sure this is correct
hope this helps ya
:D plz mark me brainiest
Answer:
the answer is a
how much energy is required to vaporize 2 kg of copper?
A 4730 kj
B 207kj
C 9460 kj
D 414kj
The Answer is 9460 kJ (C)
The other answer is cap
How does large change in temperature or pH affect proteins?
(a) They eliminate all of their essential amino acids
(b) They lose their acid sequence
(c) They come apart or lose their shape
(d) They change their amino acids into fatty acids
Answer:
(c) They come apart or lose their shape
Explanation:
Heat and temperature disrupt the attractions of the groups in the side chains that give the protein its characteristic shape.
(a) and (b) are wrong. The proteins do not lose their amino acids or their sequence.
(d) is wrong. The amino acids do not change into fatty acids.
3. Describe a possible danger that can occur if you put food, soda, coffee, pencil erasers, etc. in your mouth while conducting your chemistry experiments.
Answer:
It is possible for the object/food to have been infected/contaminated
Explanation:
If you where to be eating while doing chemistry, it is possible that some of the things you are experimenting with might have gotten on some of the things around, or come off your hands onto the thing.
Answer:
While performing chemistry experiments one should not eat food while performing the experiments as harmful chemicals can be ingested into mouth along with the food.
There are various types of chemical and substances present in lab which might be harmful for person performing experiment.
One can also get disturbed and might spill chemicals on himself which can be harmful.
in the balanced reaction nh3 + h2o - nh3oh how many hydrogen atoms are gained in the reaction
A) 3
B) 2
C) 5
D) 0
Answer:
0
Explanation:
If you mix NH3 and H2O the reaction is NH3 + H2O → NH4OH not NH3OH.
Te equation, like that is balanced. There is 1 N, 5H and 1 O in the reactives and 1 N, 5 H and 1 O so you have the same number of elements in the reactives and products, thus it's balanced and you don't need to do anything
This type of questions is relationed with REDOX balanced
A person is standing on the steps at the shallow end of the pool. What wave property explains why his/her feet appear closer to the surface then they really are? reflection interference diffraction refraction
Answer:
Diffraction
Explanation:
When light enters water at an angle, it is bent downward by diffraction. However, our brain sees the underwater image as if it were on a straight line.
Thus, the bottom of the pool appears to be shallower than it actually is.
A is wrong. If all the light were reflected from the surface, we wouldn't be able to see the person's feet.
B is wrong. if all the light rays interfered with each other, we wouldn't be able to see anything.
D is wrong. Refraction is the bending of light as it passes the edge of an object.
Answer:
refraction
Explanation:
what is the binding energy of a nucleus that has a mass defect of 5.81*10-^29 kg
A 5.23*10-^12 J
B 3.15* 10^12 J
C 1.57*10-3 J
D 9.44*10^20 J
Answer:
Choice A: Approximately [tex]5.23 \times 10^{-29}[/tex] joules.
Explanation:
Apply the famous mass-energy equivalence equation to find the energy that correspond to the [tex]\rm 5.81\times 10^{-29}[/tex] kilograms of mass.
[tex]E = m \cdot c^{2}[/tex],
where
[tex]E[/tex] stands for energy, [tex]m[/tex] stands for mass, and[tex]c[/tex] is the speed of light in vacuum.The speed of light in vacuum is a constant. However, finding the right units for this value can simplify the calculations a lot. What should be the unit of [tex]c[/tex]?
The mass given is in the appropriate SI unit:
Mass is in kilograms.
Thus, proceed with the speed of light in SI units. The SI unit for speed is meters per second. For the speed of light, [tex]c \approx \rm 3.00\times 10^{8}\;m\cdot s^{-1}[/tex].
Apply the mass-energy equivalence:
[tex]\begin{aligned} E &= m \cdot c^{2} \\ &= \rm 5.81\times 10^{-29}\; kg \times {\left(3.00\times 10^{8}\; m\cdot s^{-1}\right)}^{2}\\ &\approx \rm 5.23\times 10^{-12}\;kg\cdot m^{2}\cdot s^{-2} \end{aligned}[/tex].
The unit of energy is not in joules. Don't be alerted. Consider the definition of a joule of energy. One joule is the work done on an object when a force of one newton acts on the object in the direction of the force through the distance of one meter. (English Wikipedia.)
[tex]\rm 1\; J = 1\; N \times 1\; m[/tex].
However, a force of one newton is defined as the force required to accelerated an object with a mass of one kilogram (not gram) at a rate of one meter per second squared. (English Wikipedia.)
[tex]\begin{aligned}\rm 1\; J &= \rm 1\; N \times 1\; m\\ & = \rm \left(1\; kg\times 1\; m\cdot s^{-2}\right)\times 1\; m\\ &= \rm 1\; kg \cdot m^{2}\cdot s^{-2}\end{aligned}[/tex].
In other words, the mass defect here is also [tex]\rm 5.23\times 10^{-12}\; J[/tex].
Answer: 5.23*10^-12 j
Explanation:
Why should the scientific method be used to answer a question?
A. It provides a way to test an idea without any bias.
B. It provides a way to test a hypothesis.
C. It provides a way to ensure all hypotheses are proven correct.
D. It provides a way to quickly turn a hypothesis into a scientific
theory.
Answer:
B
Explanation:
The whole method is a step by step way to testing a hypothesis.
The scientific method is used to answer a question and it provides a way to test a hypothesis. Hence, option B is correct.
What is a hypothesis?A hypothesis in a scientific context is a testable statement about the relationship between two or more variables or a proposed explanation for some observed phenomenon.
To test the hypothesis, we need to make an observation or perform an experiment associated with the prediction.
The Scientific Method helps you put together experiments, use data to find conclusions and interpret them.
Hence, It provides a way to test a hypothesis.
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What does the symbol H stand for
Answer:
enthalpy
Explanation:
If it is used with a triangle in front, (delta H), that means the change in enthalpy. Delta H= (m)(s)(Delta T). m=mass of products, s=heat of the products, Delta T = change in temperature.
Hope that helps
5. How can you decrease the pressure of a gas in a container without changing the volume of the gas?
Answer:
By increaing the size of container
Explanation:
Gay-Lussac Law:
This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex] (at constant volume )
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
So in order to decrease the pressure of the gas in container decrease the temperature of the gas present in the container due to which pressure of the gas will also get decrease as per as Gay-Lussac law.
When can a hypothesis be elevated to the status of a theory?
a) when it is validated by an experiment
b) when data gathered from an experiment precisely fits predictions
c) when it can be proved to be true
d) when it meets the test of repeated experimentation
Answer:
d) when it meets the test of repeated expected experimentation.
Explanation:
A hypothesis is a guess based on observation in the the behavior of nature. This guess is used to formulate the relevant experiments and when the experimental results consistently meet the expected outcomes then the hypothesis graduates into a theory. Theories form the basis of many fields in science as they try to explain the behavior of nature.
Answer:
d) when it meets the test of repeated expected experimentation.
Explanation:
hope this helps
What is the concentration, in grams per liter, of a solution prepared by dissolving 0.00040 mol HCl in 2.2 L H2O? Assume that the volume of the solution does not change when the HCl is added.
Answer:
0.00663 grams/liter
Explanation:
HCl is a mineral acid with a molar mass of 36.46 g/mol.
No. of moles= mass/RMM
Making mass the subject of the formula:
Mass=Number of moles × RMM
Therefore 0.00040 mol HCl has a mass of:
0.00040 mol × 36.46 g/ mol
=0.01458 grams.
0.01458 grams are in 2.2 liters, Therefore 1 liter will have
0.01458 grams/2.2 liters= 0.00663 grams
concentration= 0.00663 grams/liter
Answer:
the answer is 0.00663 grams/liter
Explanation:
trust me bro, im asian
which is a characteristic of mixtures?
Answer:
The correct answer is "They can be separated by physical processes"
Explanation:
The definition of Mixtures is the blending of two or more dissimilar substances.
Mixtures can be divided into those that are homogeneous or heterogeneous meaning that they can be distributed evenly or can't be distributed evenly.
A distance of 2 kilometers is equal
Answer:
1.24274 miles; 3.2186818249471 kilometer; 3218.6818249471002673 meters; 321868.18249471002491 centimeters; 3218681.8249471001327 millimeters; 3218681824.9471006393 micrometers; 3218681824947.1000977 nanometers; 2.18722240048120917 yards; 6.56166720144 feet; 7.87400064173235 inches; 1.079911535 nautical mile.
Answer:
2000 meters
Explanation:
because 2 kilometers equals 2000 meters
why does stirring increase the speed of a solute dissolving in water
Answer:
When you stir a solute, more surface area of the substance is exposed to the solvent.
Explanation:
The higher the surface area in relation to volume is, the faster a solute will dissolve.
Hope it helps
Answer:
Try it and see. My guess is that stirring would increase the rate of dissolution.
Explanation:
So get 2 beakers, fil them up with 10 g salt, and add 100 mL water. Put a magnetic follower in one of the beakers, place it on a stirrer and let it rip. Measure the time, and see if the unstirred beaker still has solute on the bottom.
Which of the following describes a compound? (Hint: Carbon and oxygen bo
A.
a piece of pure carbon, containing only carbon atoms
B.
oxygen gas surrounding a solid piece of carbon
c.
a substance made of two oxygen atoms for each carbon atom
carbon and oxygen atoms mixed without being bonded together
A compound is a substance formed when two or more different elements bond together chemically. In the options provided, 'a substance made of two oxygen atoms for each carbon atom' describes a compound, specifically carbon dioxide (CO2).
Explanation:In chemistry, a compound is a substance formed when two or more different elements are bonded together. For the options provided in your question, the choice 'a substance made of two oxygen atoms for each carbon atom' most accurately describes a compound. This describes the compound carbon dioxide (CO2), where each molecule includes one carbon atom bonded to two oxygen atoms. Remember, a substance that consists of two or more elements that are chemically combined is regarded as a compound.
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2Cu(NO3)2=2CuO+4NO2+O2
What would you observe when copper(II) nitrate is heated?
Upon heating copper(II) nitrate, black-colored copper(II) oxide forms as a solid residue; brown fumes of nitrogen dioxide are released, and oxygen gas is also evolved.
When copper(II) nitrate is heated, you would observe the compound decomposing into copper(II) oxide (CuO), nitrogen dioxide (NO₂), and oxygen (O₂). Copper(II) oxide is a solid with a black color and would be visible as a residue. Nitrogen dioxide is a gas with a characteristic brown color, which would be noticeable as brown fumes evolving from the reaction mixture.
Additionally, you might see the release of oxygen gas, though it is colorless and would not be visibly noticeable without testing for its presence (such as by introducing a glowing splint, which would re-ignite in the presence of oxygen).