Answer:
B. a military unit
Explanation:
The mass spectrum of an organic compound shows the relative abundances of M to be 34.76% and M 1 to be 2.632%. Assuming the peaks are caused by C12 and C13 isotopes, determine the number of carbon atoms in the compound. The natural abundance of C12 is 98.93%, and the natural abundance of C13 is 1.07%.
The number of carbon atoms present in any compound is equal to seven.
How do we calculate the number of carbon atoms?Number of carbon atoms present in any compound will be calculated by using the following equation:
No. of Carbon atoms = Relative intensity of M+1 peak / Natural abundance of C13
Intensity of molecular peak = 34.76%
Intensity of M+1 peak = 2.632%
Relative intensity of M+1 peak = (100/34.76)×2.632 = 7.57%
Given that natural abundance of M+1 = 1.07%
On putting values on above equation, we get
No. of C atoms = 7.57 / 1.07 = 7.07 = 7 (approx)
Hence number of carbon atoms is 7.
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How hot or cold the air is.
How many spaces away from a Noble gas are the following elements?
a. Na, Li, K and Cs?
Answer:
Na - 1 away from neon
Li - 1 away from helium
K - 1 away from argon
Cs - 1 away from xenon
Explanation:
We see this trend as group 1A elements are 1 away from noble gases and hence, have a valency of 1
Is chocolate chip ice cream homogeneous or heterogeneous?.
Answer:
Chocolate chip ice cream is a heterogeneous mixture.
Explanation:
The chocolate is not uniformly mixed with the dough. These all indicate that a chocolate chip cookie is a heterogeneous mixture.
hope this answer helped :)
The mixtures are formed when two or more elements or compounds are mixed without participating in a chemical change. It is not necessary that the substance should mix in a definite ratio to form a mixture. Here chocolate chip ice cream is a heterogeneous mixture.
What is heterogeneous mixture?These are the types of mixtures in which the components are not mixed uniformly and possess a non-uniform composition throughout is defined as the heterogeneous mixture. The components of heterogeneous mixtures can be seen through eyes.
The constituent particles of heterogeneous mixture have different physical properties. The components of this mixture can be separated easily. Here the size of particles are found to be large. Examples are mixture of salt and sugar.
Here the chocolate chip ice cream is a heterogeneous mixture. This a mixture of liquid and finely dispersed solids. So it is a heterogeneous mixture.
Thus chocolate chip ice cream is heterogeneous.
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Based on the equations below, which reaction will form a precipitate?
KI (aq) + LiNO₃ (aq) →
NaOH (aq) + NH₄C₂H₃3O₂(aq) →
Ca(NO₃)₂(aq) + K₂CO₃(aq) →
Cu(NO₃)₂ (aq) + BaCl₂(a
The equation C will form a precipitate in the form of calcium carbonate.
What is a Precipitate?
This is the formation of an insoluble compound during a chemical reaction.
Ca(NO₃)₂(aq) + K₂CO₃(aq) → CaCO₃(s) + 2KNO₃(l)
The precipitate formed in this chemical reaction is CaCO₃ which is insoluble in water thereby making it the most appropriate choice.
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Which enzyme of the citric acid cycle most closely resembles the pyruvate dehydrogenase complex in terms of its structure, organization, and the reaction it performs
Answer:
The α-ketoglutarate dehydrogenase enzyme is structurally and functionally homologous to the pyruvate dehydrogenase complex.
hope it helps
Which factor does not affect the rate of solubility?.
hydration and solvation which the solvent is water. what is solvation?
Answer:
Solvation is the interaction of a solvent with the dissolved solute—in the case of water, solvation is often referred to as hydration. Solvent polarity is the most important factor in determining how well it solvates a particular solute.
Explanation:
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PLEASE HELP MEE !!!!!
1. Which organism is the main source of energy for the food web (producer)?
2. Which is a food chain you can get from this food web?
3. Which organism is a primary consumer?
4. Which organism would be considered a secondary consumer?
5. Which organism is a top predator?
6. Which organism is a decomposer?
7. Can energy recycle back into the food web?
PLEASE AND THANKYOU <33
Answer:
Hope it helps
Explanation:
1. Phytoplankton is the main source of energy.
2. Algae--> Limpet--> Starfish --> Shark (I am not sure about this answer )
3. Limpets (not sure, sorry) I think there are more than one in this, like Mussel, zooplankton...
4. Starfish
5. Shark
6. Bacteria
7. No, energy cant be recycled back into the food web.
I tried my best to answer. Hope it will help you.
If a radioactive material has a half-life of 10 years, what fraction of the material will remain after 40 years?
Answer:
1/ 16 th left
Explanation:
40 years is FOUR half lives 1/2 * 1/2 * 1/2 * 1/2 = 1/16 th will left
What percentage of the atmosphere is carbon dioxide?.
Answer:
4%
Explanation:
the answer is 4% , hope this help
18. 0mols of sodium reacts with excess chlorine. How many
grams of sodium chloride form?
please help
Answer:
I think the answer is 0 because 0 mols of sodium react
Explanation:
1.50 atmospheres to kPa
Answer:
151.988 how i don't know
A solution has [H3O+] = 2.8x10-5 M. Use the ion product constant of water K. = [H30 - ) [OH-] to find the [OH-] of the solution. Express your answer to two significant figures.
Answer:
Approximately [tex]3.6 \times 10^{-10}\; {\rm M}[/tex], assuming that the solution is dilute and is at room temperature (such that [tex]K_\text{w} = 10^{-14}[/tex].)
Explanation:
Look up the ion product constant of water:
[tex]K_{\text{w}} \approx 10^{-14}[/tex].
In a dilute solution where water is the solvent, the product of [tex][{\rm {H_{3}O}^{+}}][/tex] and [tex][{\rm {OH}^{-}}][/tex] (concentration of [tex]\rm {H_{3}O}^{+}}[/tex] ions and [tex]{\rm {OH}^{-}}[/tex] ions) is constantly equal to [tex]K_{\text{w}}[/tex]. (The unit of both [tex][{\rm {H_{3}O}^{+}}]\![/tex] and [tex][{\rm {OH}^{-}}]\![/tex] need to be [tex]{\rm M}[/tex].) In other words:
[tex][{\rm {H_{3}O}^{+}}]\, [{\rm {OH}^{-}}] = K_{\text{w}}[/tex].
Rearrange this equation to find [tex][{\rm {OH}^{-}}][/tex] in terms of [tex]K_{\text{w}}[/tex] and [tex][{\rm {H_{3}O}^{+}}][/tex]:
[tex]\begin{aligned}[] [ {\rm OH^{-}} ] &= \frac{K_{\text{w}}}{[{\rm {H_{3}O}^{+}}]} \\ &= \frac{10^{-14}}{2.8 \times 10^{-5}} \\ &\approx 3.6 \times 10^{-10}\end{aligned}[/tex].
A sample of carbon monoxide and oxygen gasses are
allowed to combust in a small flask. They reaction is
described by the following equation.
2CO (g) + O₂ (g) → 2CO2 (g)
After the reaction is complete, the pressure of CO₂ is 0.868
atm and the temperature is 35.0 °C in a 500.0 mL flask. How
many moles of CO2 were produced assuming that the
reaction went to completion?
Answer:
.0172 mole of CO2
Explanation:
PV = nR T n = number of moles V = .5 liter
R = gas constant = .082057 L atm/(k mole)
T needs to be in Kelvin = C + 273.15
.868 * .5 = n * .082057 * ( 35 + 273.15)
n = .0172 moles
How are acids described according to the bronsted-lowry definition?.
Answer:
an acid is a proton (H⁺) donor
Explanation:
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pls nmark brainliest
According to LOCO mass, the mass of reactants and products are what?
Answer:
Equal
Explanation:
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
How many electrons are lost or gained in forming each ion? a. Ba2+ b. As3- c. Cu2+
Answer:
See below
Explanation:
Part a)
Ba⁺²
Since it has a positive charge, this means it has lost electrons and that too 2 electrons. It has lost 2 electrons.
Part b)
As⁻³
Since it has a negative charge, it has gained electrons and that too 3 electrons. It has gained 3 electrons.
Part c)
Cu⁺²
It has a positive charge, so it has lost electrons and that too 2 electrons. It has lost 2 electrons.
[tex]\rule[225]{225}{2}[/tex]
What is the power of a food processor that can perform 1,350 joules of work in 15 seconds
Can someone please help me? :(
nuclear energy, once used up it can not be used again
Copper(II) sulfate is an example of a substance that dissolves in water. Copper(II) sulfate is an ionic compound with the chemical formula CuSO4 and when it is added to water it dissociates into Cu2+ and SO42− ions. Students used both copper sulfate crystals and copper sulfate powder in this experiment on the rate of dissolving. Choose one statement that represents a valid conclusion based on the student data?
A) The smaller the solute particles the more energy they have. Increased energy results in shorted dissolving time.
B) A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
C) As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
D) Agitation of the powder allows fresh solvent molecules to continually be in contact with the solute
As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
Does increase in temperature make solids to dissolve faster?Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.
As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.
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Answer:
A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
Explanation:
The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.
And I took the test and got this right!
Why is it possible for an oxygen atom to form a double covalent bond, but its not possible for a chlorine atom to form a double covalent bond?
When 5.0g of a nonelectrolyte is added to 25g of water, the new freezing point is -2.5 degrees C What is the molality of the solution? What is the molar mass of the unknown compound
The molality of the solution and the molar mass of the unknown compound is mathematically given as
M=1.34149.25g/molWhat is the molality of the solution, and the molar mass of the unknown compound?Generally, the equation for the Molarity is mathematically given as
M=dt/Kt
Therefore
M=2.5/1.86
M=1.34
Therefore
M=wt s/Mol of un*1000/gof solvent
mol of un =5*1000/1.34*25
149.25g/mol
In conclusion, the molar mass of the unknown compound is
149.25g/mol
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Calculate the number of moles and the number of grams of the following solution 1. 0L of 0. 50M NaCI
A mother and two young children are found passed out in their apartment, where a space heater is on. Emergency medical technicians suspect carbon monoxide poisoning. Why is carbon monoxide dangerous
Answer:
ummm a I guess if I am wrong tell me
What is one thing that could have prevented the Chernobyl tragedy?
Answer: if the staff at Chernobyl had been better trained.
The Chernobyl series seems to suggest there were a number of ways the explosion could have been prevented. These include if the staff at Chernobyl had been better trained, if the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.
difference between atom and molecule
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together. An ion is a positively or negatively charged particle.
Answer:
atoms constitute molecules; molecules are formed by the union of 2 or more atoms
Explanation:
Which gas law relates pressure and volume?
- Is there a direct or indirect relationship?
- What variable is held constant?
Gas laws are the relation between pressure, volume, and temperature of the gas. The relation between the pressure and the volume of the gas is given by Boyle's law.
What is Boyle's law?Boyle's law gives the relation between the pressure and the volume of the gas and states that the pressure is in the inverse relationship with the volume of the gas.
When the pressure of the gas is increased the volume of the gas decreases, similarly the decreased pressure of gas results in an increased volume of gas.
Boyle's law is given as,
[tex]\rm V = \rm constant (\dfrac{1}{P})[/tex]
and,
[tex]\rm P_{1}V_{1} = \rm P_{2}V_{2}[/tex]
Boyle's law is only true if the moles of the gas (n) and the temperature (T) of the gaseous system are constant.
Therefore, pressure and volume are in indirect relation and the moles and the temperature are constant in Boyle's law.
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Can an intermediate appear as a reactant in the first step of a reaction mechanism?.
Answer:
No
Explanation:
An intermetiate in a chemical reaction is something that is formed and reused in a reaction.
A student measured and recorded the temperature of the liquid
inside a can of carbonated soft drink. He then poured the soft
drink from the can into a glass filled with ice. Gas bubbles
appeared on the sides of the glass and formed a layer of foam
as they rose to the top of the glass. The mixture gave off a sweet
odor. When the temperature of the soft drink and ice mixture
was measured, the temperature of the mixture was much lower
than the temperature previously recorded for the canned soft
drink. The student concluded a chemical change had taken
place.
Which statement provides the best evidence that the student's
conclusion is wrong?
Gas bubbles
appeared on the
sides of the glass.
No new substances
were formed.
There was a change
in temperature.
The mixture gave off
a sweet odor.
There is the change in temperature is the correct answer.
What is a carbonated soft drink?Carbonated beverages are drinks that include carbon dioxide dissolved in water.
It is given as the formation of bubbles and the odour will be concluding with the formation of the new product and thereby a chemical change. Whereas there was no chemical change if the temperature lowers down as the reason stands to be the formation of a mixture.
Hence, there is a change in temperature.
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