the amount of energy absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure, is formed.
solution:According to Avogadro's law 1 mole of any gas occupies 22.4 L (dm3) at room temperature and pressure.
So the amount of energy absorbed:
(kJ)E=131∗240/22.4
=1403.6(kJ)
1403.6 kJ is absorbed when 240 dm3 of hydrogen, measured at room temperature and pressure is formed.
If 40mL of 2.50M HCl neutralizes 500ml. of KOH, what is the molarity of the KOH?
The molarity of the 500 mL KOH solution needed to neutralize the 40 mL of 2.50 M HCl is 0.2 M
Balanced equationHCl + KOH —> KCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1
The mole ratio of the base, KOH (nB) = 1
How to determine the molarity of KOH Volume of acid, HCl (Va) = 40 mLMolarity of acid, HCl (Ma) = 2.5 MVolume of base, KOH (Vb) = 500 mL Molarity of base, KOH (Mb) =?MaVa / MbVb = nA / nB
(2.5 × 40) / (0.15 × Vb) = 1
100 / (Mb × 500) = 1
Cross multiply
Mb × 500 = 100
Divide both side by 500
Mb = 100 / 500
Mb = 0.2 M
Thus, the molarity of the KOH solution needed is 0.2 M
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What are the forms of energy that are transfer from the abiotic factors to the biotic factors and back to the abiotic factors of an ecosystem
Answer:
sunlight, light energy from the sun
Explanation:
energy is transferred from the sun to plants then animal's eat plants
A sealed flask contains 3.82 x 1024 molecules of CO, How many moles of Co, are in the flask?
Answer:
if you meant 3.82* 10^24, the answer is 6.34551495 moles
if you meant 3.28*1024, the answer is 6.49780731*10^-21 moles
since you're going from molecules to moles, you need to divide by Avogadro's number which is 6.02*10^23
ANSWER FAST PLS ILL GIVE BRAINLY 5. What are animals called that make their homes underground?
grazers
reptiles
burrowers
meat-eaters
Answer:
burrowers
Explanation:
This type of intermolecular force relates to the
big difference in the electronegativities. It exists
when N, O or F atom attracts with hydrogen
atom. Medium strength of attraction is
exhibited
The type of intermolecular force relates to the big difference in the electronegativities and is known as hydrogen bonding.
What are intermolecular forces?Intermolecular forces may be defined as the mechanism that mediates the interaction between the atoms of the molecules. It significantly includes the electromagnetic forces of attraction and repulsion between the atoms.
Some examples of intermolecular forces include London-dispersion force, dipole-dipole interaction, van der Waals interaction, hydrogen bonds, etc. Each one of them possesses a different set of characteristic properties distinctly. Some types of forces are also present in the body of living organisms.
Hydrogen bonding is a characteristic kind of interaction that remarkably includes dipole-dipole attraction between the most electronegative elements like Nitrogen, Oxygen, fluorine, etc., and the hydrogen atom.
Therefore, hydrogen bonding is a type of intermolecular force relates to the big difference in the electronegativities.
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which molecule can't be exist?
A)NCl3 B)OF6 C)ONF3 D)PCl3
Answer:
OF6
Explanation:
Oxygen and fluorine have almost the same electronegativity, so oxygen isn't able to donate enough electron density to fluorine to form OF6. Atomic size. There isn't enough room around an oxygen atom for six fluorine atoms.
:-befrank
what are the basic elements of environment
Answer:
the basic elements of environment are lithosphere, hydrosphere, atmosphere and biosphere.
Explanation:
If one 330 mL Coca-Cola contains 170 grams of dissolved C*O_{2} how many H^ + ions are made if 70% of the dissolved C*O_{2} reacts completely with water until it is a simple carbonate ion (CO 3 ^ 2- ) ?
Please help me!!!
Answer:
bu bir kimya sorusu sanırim
The interstitial fluid is generally poor, while the plasma is generally rich in ---------. A. Protein B. Sodium and chloride ions C. Hydrogen ions D. Carbohydrates
Answer:
B Hydrogen Ions is answer
The Scotch broom is an invasive species in California, Oregon and Washington. These shrubs grow quickly after areas that have been cleared of
trees and inhibit reforestation by out-competing native seedling trees. These plants developed a mutation that causes their seed to burst from
their shell when touched by passing animals. As animals brush past these plants, the black dried pods of the Scotch broom explode with a sharp
pop, scattering seeds away from the parent plant.
Which statement below best explains why the Scotch broom is able to out-compete the native plants in that area?
A. Relying on animals to disperse the seeds always results in better reproductive success than other methods of seed dispersion.
B. Specialized seed pods allow seeds to be dispersed farther and into less crowded areas promoting reproductive success.
C. The crackling sound of seed pods exploding promotes reproductive success by attracting the animals that are responsible for scattering
seeds.
D. Genetic mutations have caused the plant to be more resistant to cold temperatures allowing them to survive and reproduce all year
long.
Based on the illustration, the statement that best explains why the Scotch broom is able to outcompete the native plants in the area would be the specialized seed pods that allow seeds to be dispersed farther and into the less crowded areas.
Reproductive successDifferent organisms have different ways of behaving to ensure the survival of their propagules or offsprings.
In the case of the Scotch broom, the ability of the pods holding the seeds to burst open and catapult the seeds far away from the parent plant is a reproductive strategy to ensure that their seeds are well dispersed.
By doing so, the propagules of the plant will reach new areas where they do not exist before and as such, able to spread quite quicker than the native plants.
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Why is carbon dioxide a necessary part of the atmosphere.
Answer:
it gives plants life and plants give us oxygen
What is the pH of a 4.5 x 10^-3M HI solution?
A) 0.1
B) 4.8
C) 3.2
D) 2.4
Inside a car that was at STP, a 1.33L bottle warms up to 102.31oC. If the volume of the bottle remains constant, what is the pressure, in atm, inside the hot water bottle
so 68 + 83 is 182 easy done
How does pathogen infection result in the occurrence of fevers in a host?
Edema caused by the pathogen raises the body temperature..
The pathogens break down the host's hypothalmus..
Pyrogens produced by the pathogen alter the host thermostat.
The interaction between PAMPs and PRPs causes a respiratory burst.
Answer:
The answer is Edema caused by the pathogen raises the body temperature. :)
Have an amazing day!!!
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1. -A mixture of aluminum metal and chlorine gas reacts to form aluminum chloride (AlCl3): 2Al(s) +
3Cl2(g) → 2AlCl3(s). How many moles of aluminum chloride will form when 5 moles of chlorine gas react
with excess aluminum metal?
Answer:
3.33 moles
Explanation:
We know that our limiting reactant is chlorine so we just have to figure out how much of the product aluminum chloride (AlCl3) would be formed from 5 moles of chlorine gas. As we can see in the balanced equation, the mole ratio of chlorine gas (Cl2) to aluminum chloride is 3:2 based on the coefficients of the species. All you have to do from here is divide the amount of moles of chlorine gas by its own coefficient and then multiply the number you receive by the coefficient of AlCl3.
5/3=1.66
1.66*2=3.33
chlorine water exposed to sunlight equation?
Answer:
Cl2 (aq) + 2H2 O HOCl(aq) + Cl-(aq) + H2O Equation 1 The hypochlorous acid dissociates almost immediately into hydrogen and hypochlorite ions (OCl-).
Explanation:
Pregnant women are often cautioned against cleaning cat litter boxes. This is because Toxoplasma, an intestinal parasite of cats, can be transmitted from infected feces to the expectant mother and ultimately to the fetus. For these reasons, Toxoplasma is considered
....
a noninfectious disease.
a communicable disease.
an addictive disease.
a nosocomial disease.
a zoonotic disease.
a necrotizing disease..
Answer:
A communicable disease
Explanation:
Diseases that can be transferred are known as communicable diseases.
A small sample of methane burns, producing co2 and water vapor. as the hot gas mixture expands, it releases 120.0 kj of heat and does 830.0 kj of work pushing against a piston. what is the total amount of energy released in this reaction
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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A buffer solution is prepared by adding NH4Cl to a solution of NH3 (ammonia).
NH3(aq) + H2O(I) = NH4+(aq) +OH-(aq0
What happens if Ca(NO3)2 is added?
Shifts to reactants, remain the same, shifts to products.
Please HELP!
I watched the video, but I still don't get it!
I don't know how this works
Answer:
Remains the same
Explanation:
I just got it right on Acellus!
Which is older? Dinosaurs or Grasshoppers?
Answer:
i think grass hopper
Explanation:
answer my question i am am brainiest
what are the products for the following equation?
LiBr + F ->
[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]
Here's the balanced chemical equation for above reaction ~
[tex]\qquad \sf \:LiBr + F \rightarrow Li F + Br[/tex]
Here, fluorine is more more more reactive than Bromine, therefore it replaces Bromine from its compound and forms Lithium floride.
1. Set up a Bunsen burner on a heat-proof mat.
2. Take a small piece of magnesium ribbon and place it in some tongs
3. Hold the tongs at arm's length and place the magnesium ribbon in the Bunsen flame.
4. Once the magnesium is burning DO NOT LOOK DIRECTLY AT THE FAME. Magnesium burns very brightly and the light could harm your eyes.
A1. Describe what has been formed
A2. Name the reactants in this chemical reaction.
A3. List all the safety precautions you need to take while carrying out this experiment
Answer:
MAKE ME BRAINLIEST TOOK TIME!!!!
Explanation:
A1) When magnesium reacts with oxygen, it produces light bright enough to blind you temporarily. Magnesium burns so bright because the reaction releases a lot of heat. As a result of this exothermic reaction, magnesium gives two electrons to oxygen, forming powdery magnesium oxide (MgO).
A2) magnesium oxide
A3) Do not return chemicals to their original packaging. An incompatible mixture may accidentally be formed.
Keep chemical containers closed. Dust and vapour may escape from an open container, while gases and suspended material may penetrate this, causing the nature of the chemical to change. This will also avoid unnecessary exposure.
Never use a wrong or an unmarked reagent. If you are unsure about the compound, do not use it. Instead, have it disposed of (see Disposal of Hazardous Waste).
Never put spatulas, stirrers or other objects into a storage container for chemicals. Remove the contents by pouring and rolling the contents of the glass into a beaker, glass container or other suitable equipment. Spatulas may be used with caution in laboratory reagent containers. Remember the labelling (see the Safety Rules for working in lab).
Once removed from the bottle or glass, cork stoppers must be placed on a clean surface (e.g. a watch glass or other suitable equipment) with the opening facing down. This is to avoid contamination of the compound and unnecessary exposure.
Chemical bottles must not be carried by the neck of the bottle, nor next to your body. Suitable carrying arrangements should be employed, e.g. buckets or trolleys.
When pouring from bottles, the label should always face upward to prevent any spillage from destroying the label.
Never put any chemicals in the bottle other than the one indicated on the label.
Special precautions should be taken when handling concentrated acids. Dilution of acids should be performed by pouring the acid into water and stirring continuously.
An envelope could be a source of DNA evidence.
True
False
Answer:
True
Explanation:
DNA can be extracted from bite marks, cigarette buds, postage stamps on envelopes, and envelope flaps for DNA analysis.
Answer:
false. a envelope is what the DNA evidence goes in
Explanation:
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 %
3. Which of the following statements is true?
a. A lithium ion has a 1+charge because it gained
one electron.
b. A magnesium ion has a 2-charge because it
lost two electrons.
c. A sulfide ion has a 2-charge because it gained
two electrons.
d. A chloride ion has a 1+ charge because it gained
one electron.
e. An aluminum ion has a 3-charge because it lost
three electrons.
c. A sulfide ion has 2- charge because it gaines two electrons
thia statement is true.
What is the most significant solute in determining the distribution of water among fluid compartments
Answer:
Sodium (Na+)
Explanation:
Volume status is regulated through the monitoring of systemic solute per unit volume, or osmolarity. Sodium, the most prominent electrolyte 'solute' in extracellular fluid, is used to monitor extracellular osmolarity. A disproportionate loss of water relative to sodium results in a concentrating osmolar effect.
What amount of heat is required to increase the temperature of 75.0 g of water from 22.3˚C to 36.1˚C?
Answer:
4332.5 j
Explanation:
Specific heat of water is 4.186 j /g-C
4.186 j / g-C * 75 g * (36.1-22.3 C) =
What type of probes physically land on the surface of a planet or moon?
Answer:
Here are three types of probes that land on space physically. Interplantery, orbiters, and landers.
Explanation:
These are the ones that collect data and other stuff from space.
Cyclohexane can be manufactured from hexane as shown in the equation.
C6H14 C6H12 + H2
Calculate the mass of cyclohexane that can be made from 258 g of hexane.
[Mr
of cyclohexane = 84
Mr Hexane = 86 g/mol
mol hexane = 258 : 86 = 3
mol cyclohexane = mol hexane = 3
mass cyclohexane = 3 x 84 = 252 g
How may using sorbents to clean an oil spill be helpful to the ecosystem?
Answer:
Are sorbents good for the environment?
Natural Inorganic Sorbents
Second, sorbents that sink should not be used as they could be harmful to the environment. Sinking is a problem with many sorbents, such as untreated peat moss, most inorganic sorbents, and many wood products.
Its major result is to clean out some surface contaminants, which makes it simpler for oil to absorb. On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise. In turn, this greatly improves the oil sorption capacity and oil to water selectivity.
What are the advantages of using sorbents?When recovering adsorbent materials that cause secondary contamination, lighter, less viscous oil is lost through the pores more readily than heavier, more viscous oils. Application is simple because sorbents can be applied automatically or manually to spills using blowers or fans.
The best sorbents for recovering oil are typically synthetic ones. In some circumstances, a weight ratio of 40:1 for oil to sorbent can be reached, as opposed to 10:1 for organic compounds and only 2:1 for inorganic materials.
A substance used to absorb or adsorb liquids or gases is known as a sorbent. Examples comprise: a substance that works via adsorption and is comparable to molecular sieve material (attracting molecules to its surface). It has strong thermal conductivity and a big interior surface area.
Thus, On the other hand, pyrolysis, a high-temperature thermal treatment, causes the sorbent to carbonise.
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