How does the radioactive isotope C-14 differ from its stable counterpart C-12?
Isotope is defined as atom of same element with same atomic number but different mass number.
Here, atomic number for C-14 and C-12 is 6 but mass number is 14 and 12 respectively.
Atomic number is equal to number of protons and electrons in an atom and mass number is equal to sum of number of protons and neutrons in nucleus of an atom.
[tex]A=n_{p}+n_{n}[/tex]
Since, both have same atomic number, the number of protons will be 6 for both but they have different number of neutrons.
Number of neutrons in C-12:
[tex]n_{n}=12-n_{p}=12-6=6[/tex]
Number of neutrons in C-14:
[tex]n_{n}=14-n_{p}=14-6=8[/tex]
The number of neutrons in C-12 is 6 and that in C-14 is 8. Therefore, isotope C-14 differ from the stable C-12 in number of neutrons.
a sample of methane gas having a volume of 2.8 L at 25°C and 1.65 atm was mixed with a sample of oxygen gas having a volume of 35L at 31°C and 1.25 atm. The mixture was ignited to form carbon dioxide and water. Calculate the volume of carbon dioxide formed at a pressure of 2.5 atm and a temperature of 125°C
[tex]\left[\begin{array}{cccc}&Volume(L)&Pressure(atm)&Temperature(K)\\Methane&2.8&1.65&298\\Oxygen&35&1.25&304\end{array}\right][/tex]
note: K = C° + 273 (Temperature conversion, Celsius to Kelvin)
Find moles of methane and oxygen:note: [tex]Ideal \ Gas \ Law: \ PV=nRT \ \ \ (R = 0.082 \ \frac{L \times atm }{K \times mol} )[/tex]
Formula to find moles is: [tex]n=\frac{PV}{RT}[/tex]
[tex]\space \\CH_{4} \ : \ n = \frac{1.65 \times 2.8}{298 \times 0.082} = 0.19\ mol \ (limiting \ reactant)[/tex]
[tex]O_{2} \ : \ n = \frac{1.25 \times 35}{304 \times 0.082} = 1.75\ mol \ (2 \times 0.19 = 0.38 \ mol \ is \ enough)[/tex]
note: moles of CO₂ is the same as of CH₄, as can be seen from the chemical equation above, which is 0.19 mol.
Find volume of CO₂:[tex]\left[\begin{array}{ccccc}&Volume(L)&Pressure(atm)&Temperature(K)&Moles(mol)\\CO_{2} &?&2.5&398&0.19\end{array}\right][/tex]
Formula to find Volume is: [tex]V=\frac{nRT}{P}[/tex]
[tex]CO_{2} \ : \ V = \frac{0.19 \times 0.082 \times 398}{2.5} = 2.48 \ L[/tex]
So, the answer is: 2.48 Lwhat are atoms help
a b c d no a no b yes c no d ok
How are the sparks from a sparkler that strike your skin akin to tiny droplets o boiling water striking your skin?
Final answer:
The sparks from a sparkler and tiny droplets of boiling water both have high thermal energy, transferring this energy to the skin upon contact, causing a burn. A static electricity spark from a doorknob is too brief to harm you. Steam burns are worse than boiling water because of the release of latent heat.
Explanation:
When a sparkler comes into contact with your skin, the hot sparks cause a sensation similar to tiny droplets of boiling water hitting your skin. Both the sparks and the boiling water droplets have a high amount of thermal energy. When they come into contact with your skin, they transfer some of this energy to your skin cells, causing a burn. The transfer of energy in both cases is rapid and occurs over a very small area of contact, leading to a high concentration of energy which can be quite painful.
In the case of a static electricity spark from a doorknob, which can carry a few hundred watts of power, the reason you're not injured is that the spark is very brief. It doesn't last long enough to transfer a significant amount of energy to cause harm. The situation is unlike with a sustained contact with something hot, where energy transfer is more prolonged.
Similarly, when steam condenses on your skin, it releases latent heat, which causes a burn. The latent heat is the energy that was used to break the hydrogen bonds when turning water into steam. When steam condenses back to water on your skin, it releases this energy, causing a more severe burn than boiling water would at the same temperature.
Which object in the diagram represents earths moon
What is an abiotic factor in a squirrel's habitat that could be harmful if the factor changed
There are many methods used to obtain energy for use in our daily lives. Some of these methods have possible environmental consequences to rivers, groundwater, and organisms. One type of pollution involves excess carbon dioxide being released into the air. Some of the carbon dioxide reacts with water to form acid rain. Which energy sources can release carbon dioxide and carbon monoxide waste into the atmosphere?
A) wind and solar
B) wind and nuclear
C) solar and nuclear
D) coal and petroleum
Explain what happens when two light waves traveling from the same direction of displacement meet.
What energy transformations occur between the microwave oven and the meal? *
Someone help me please!
This is Stoichiometry and I need part 2 and 3
Answer:
did u get it
Explanation:
_______ reaches the Earth's surface through _______, then turns into _______.
Answer:
Magma, Volcano, Lava
Explanation:
During the time of convergence of two plates, the subduction zone is created due to the sinking of the heavier plate below the lighter one. The long, narrow depression, commonly known as trench forms above this zone of subduction.
As the heavier plate goes down, it melts and mixes with the magma. This magma then rises upward due to the force exerted by the large convection currents, which eventually reaches the earth's surface towards the over-riding plate, giving rise to the formation of volcanoes.
When the uplifting of magma is large and rapid, then it erupts on the surface, and undergoes solidification, forming lava.
Thus, the magma reaches the surface of the earth through the formation of volcano and solidifies as lava.
5.
The diagram illustrates part of the carbon cycle.
Which best describes the diagram?
A consumer is obtaining carbon by breathing it in from the atmosphere.
A consumer is obtaining carbon by absorbing it from the soil.
A consumer is obtaining carbon by eating carbon-based molecules stored in a producer.
A consumer is obtaining carbon by eating carbon-based molecules stored in a decomposer.
Answer:
The correct answer is "A consumer is obtaining carbon by eating carbon-based molecules stored in a producer".
Explanation:
The animal is consuming the carbon present in the molecules stored in the grass. Plants process the carbon present in the soil along with other minerals. The animal, when it feeds on these plants, is consuming the carbon they obtained from the soil. Grasslands are defined largely by their use for grazing, which includes between 10 and 30 percent of soil carbon worldwide.
Have a nice day!
Answer:
C
Explanation:
it was right on (edge nuity)
which planet has the presence of liquid water, a period of rotation equal to 24 hours, and a solid inner core
Earth is the only planet in our solar system with large amounts of liquid water, a solid inner core, and a 24-hour rotation period, making it uniquely capable of supporting life.
The planet that matches the criteria mentioned in the question is Earth. Earth is the third planet from the Sun and the only one we know of that has large amounts of liquid water, an atmosphere with oxygen, and is suitable for life. Earth also has a solid inner core, a surface mostly covered with water, and a period of rotation approximately equal to 24 hours. Unlike Venus, which rotates slowly in the opposite direction, and Mars with its red soil and ice caps, Earth has conditions considered 'just right' for development and sustenance of life.
Furthermore, the outer planets are gas giants and significantly different from Earth. They do not have solid surfaces or conditions that would allow for the presence of liquid water as we know it. Earth's moon, which is large and round, is unique among the inner planets. The combination of these features validates that Earth is the planet being described.
how many moles of barium hydroxide, Ba(OH2), would be required to react with 117 g hydrogen bromide, HBr?
The correct calculation yields 0.724 moles of Ba(OH)₂, not 2.93, indicating a mistake in the given answer's stoichiometry interpretation.
To react completely with 117 g of hydrogen bromide (HBr), 2.93 moles of barium hydroxide (Ba(OH)2) would be required.
First, we need to write the balanced chemical equation for the reaction between barium hydroxide and hydrogen bromide:
[tex]\[ \text{Ba(OH)}_2 + 2\text{HBr} \rightarrow \text{BaBr}_2 + 2\text{H}_2\text{O} \][/tex]
From the balanced equation, we can see that 1 mole of barium hydroxide reacts with 2 moles of hydrogen bromide.
Next, we need to calculate the number of moles of hydrogen bromide (HBr) present in 117 g. The molar mass of HBr is 80.91 g/mol (1.008 g/mol for H and 79.90 g/mol for Br).
[tex]\[ \text{moles of HBr} = \frac{\text{mass of HBr}}{\text{molar mass of HBr}} \][/tex]
[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]
[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]
Now, using the stoichiometry of the balanced equation, we can find the moles of barium hydroxide required:
[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times \text{moles of HBr} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 = \frac{1}{2} \times 1.448 \text{ moles} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 =0.724 \text{ moles} \][/tex]
However, the given answer is 2.93 moles, which suggests that there might be a mistake in the calculation. Let's re-evaluate the moles of HBr:
[tex]\[ \text{moles of HBr} = \frac{117 \text{ g}}{80.91 \text{ g/mol}} \][/tex]
[tex]\[ \text{moles of HBr} =1.448 \text{ moles} \][/tex]
Since the stoichiometry of the reaction is 1 mole of Ba(OH)2 to 2 moles of HBr, the correct calculation for the moles of Ba(OH)2 required should be:
[tex]\[ \text{moles of Ba(OH)}_2 = 1.448 \text{ moles HBr} \times \frac{1 \text{ mole Ba(OH)}_2}{2 \text{ moles HBr}} \][/tex]
[tex]\[ \text{moles of Ba(OH)}_2 = 0.724 \text{ moles} \][/tex]
It appears that the provided answer of 2.93 moles of Ba(OH)₂ is incorrect based on the stoichiometry of the reaction and the calculations performed. The correct answer should be 0.724 moles of Ba(OH)₂. There seems to be a discrepancy between the provided answer and the calculated result. The correct answer, based on the calculations, is 0.724 moles of barium hydroxide, not 2.93 moles.
what is the simplest alkane
Answer: C. Methane
Explanation:
the rows on the periodic table correspond to
Which information is represented by a line on this map?
A. points with the same elevation
B. the location of a road
C. a direction north or south
D. a direction east or west
what is the molarity of a solution of calcium chloride which contains 33500mg of solute in total volume of 0.352L?
Na2SO4 is dissolved in water to make 450 mL of a 0.250 M solution. What is the molar mass of Na2SO4, and how many moles are needed?
What is the molarity of the solution formed by mixing 0.20mol of sodium hydroxide with enough water to make 150 ml of solution?
The molarity of the solution formed by mixing 0.20 mol of sodium hydroxide with enough water to make 150 ml of solution is 1.33 M.
Explanation:To find the molarity of the solution formed by mixing 0.20 mol of sodium hydroxide with enough water to make 150 ml of solution, you need to calculate the number of moles of sodium hydroxide and then divide it by the volume of the solution in liters. Firstly, convert the volume of the solution to liters by dividing it by 1000. Then, divide the number of moles of sodium hydroxide by the volume of the solution in liters to get the molarity.
Molarity (M) = moles of solute / volume of solution (in liters)
Molarity = 0.20 mol / (150 mL / 1000) = 1.33 M
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how many grams are there in 0.250 moles of sodium hydroxide
Answer: The mass of sodium hydroxide is 10 grams.
Explanation:
To calculate the mass of a substance, we use the equation to calculate the number of moles, we get:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
We are given:
Moles of sodium hydroxide = 0.25 mol
Molar mass of sodium hydroxide = 40 g/mol
Putting values in above equation, we get:
[tex]0.25=\frac{\text{Mass of sodium hydroxide}}{40g/mol}\\\\\text{Mass of sodium hydroxide}=10g[/tex]
Hence, the mass of sodium hydroxide is 10 grams.
Explain how the law of conservation of mass allows you to predict the total Mr of the products.
Mass is never lost or gained in chemical reactions. So we can say that mass is always conserved. In other words, the total mass of products at the end of the reaction is equal to the total mass of the reactants at the beginning.
This fact allows you to work out the mass of one substance in a reaction if the masses of the other substances are known.
You are given the percent by mass of the elements in a compound and wish to determine the empirical formula. Label each of the following statements as true or false and explain your answers.
a. You must assume exactly 100.0 g of the
compound.
b. You must convert percent by mass to relative
numbers of atoms.
c. You must divide all of the percent by mass
numbers by the smallest percent by mass.
d. You cannot solve for the emp
.817g of an unknowm gas occupies 1.25L at 27.0°C and a pressure of 765 mmhg. is the gas most likely methane(CH4), ethane(C2H6), propane(C3H8), or butane(C4H10)? please show work.
Name at least two Benefits of using models in science
Answer:
Models make concepts more tangible. They also make it possible to notice patterns, develop or revise representations, and predict or explain events or relationships.
Explanation:
Trust me it's the answer okay
Andrea is performing an experiment in which she needs to know when a strong acid is present. She is not sure which indicator to use, so she looks up the following table in her science textbook.
Indicator pH range
thymol Blue 1.2 - 2.8
phenol Red 6.4 - 8.0
phenolphthalein 8.0 - 10.0
trinitrobenzoic acid 12.0 - 13.4
According to the textbook, which indicator should Andrea use?
Hint: Neutral substances have a pH of 7. Acids have a pH that is less than 7, and bases have a pH that is greater than 7.
A.
phenolphthalein
B.
phenol Red
C.
thymol Blue
D.
trinitrobenzoic acid
Reset Submit
Answer:
c- thymol blue
Explanation:
study island
According to the textbook, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.
What is Strong acid?Strong acid may be defined as a type of acid that is completely dissociated or ionized in an aqueous solution. It is a type of chemical species that typically have the ability to lose a proton, H+. Examples of strong acids include sulphuric acid, hydrochloric acid, nitric acid, etc.
Acids range the pH lower than 7. While exactly 7 is a neutral compound. In the experiment, Andrea was required to know when a strong acid is present, so she utilizes an indicator. For this, she used the indicator that has the pH of strong acid.
Among the options given above, the indicator thymol blue demonstrates the same qualities and characteristics.
Therefore, the indicator that should Andrea use is thymol blue. Thus, the correct option for this question is C.
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What’s the IUPAC name for CH2=C(CH2CH3)2?
The IUPAC name for the compound CH2=C(CH2CH3)2 is 2,3-diethylbut-1-ene, with the double bond starting at the first carbon of the four-carbon main chain.
Explanation:The student is asking for the IUPAC name of the chemical compound with the molecular formula CH2=C(CH2CH3)2. This compound is an alkene with two ethyl groups attached to the carbon-carbon double bond. The longest carbon chain that includes the double bond has four carbon atoms. Therefore, the base name is butene. Since there are two identical substituents (ethyl groups), the correct IUPAC name is 2,3-diethylbut-1-ene. In naming the compound, the ethyl groups are listed in alphabetical order and the number 1 indicates the position of the double bond.
What is the consumption of dietary supplememts considered risky
Hello there!
Sometimes it is good to go on a diet for us. Other times, (we may not realize it), but it can be risky for our health and bodies. While getting more vitamins can be healthy and good for us, too much of the same vitamins in our body can be unhealthy, and even cause scary side effects. Do not be misled, the title “vitamin”, does not mean “use generously”. Just as we are to limit our eating of unhealthy foods, we need to limit our use of just vitamins as well.
For example, while vitamin A can be beneficial for our bodies in some ways, too much of it can liver damage, headaches, reduce bone strength, and in very serious cases even birth defects to children, or one conceiving a child. Yes, we need just enough to keep us healthy an active. There can only be so many problems with the human body, and using too many dietary supplements should not be one of them.
Hope this helps!
~DL
Infer if the mineral Talc would be a good choice when building a statue outside. Justify your answer with your knowledge of minerals and acid/bases. According to your data, would there be a better mineral to use? If so, which one and why?