A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Explain why this occurs.
Answer:
The right option is; b. the water caused an increase in temperature of the air inside the ball and an increase in pressure.
The dent (hollow area formed by pressing or hitting) from the ping-pong ball disappeared because energy was transferred from the hot boiling water in which the ball was placed to the air inside the ball. This transferred energy will increase the temperature of the air inside the ball and the air molecules will begin to move faster with a greater force. Hence, causing an increase in pressure.
Explanation:
Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg
Answer:
65.1
Explanation:
Which nuclear emission has the greatest penetrating power?
b. beta particle
a. proton
c. gamma radiation
d. positron
Answer:gamma radiation
Explanation:
Among the nuclear emissions including proton, beta particle, positron and gamma radiation, gamma radiation has the greatest penetrating power. It needs dense materials like lead or concrete to be shielded.
Explanation:Of the nuclear emissions listed: a. proton, b. beta particle, c. gamma radiation, and d. positron, the one with the greatest penetrating power is c. gamma radiation. Unlike other particles, gamma radiation is a type of electromagnetic radiation, similar to X-rays. This means it is not a charged particle, allowing it to penetrate materials more easily.
For instance, alpha and beta particles would be blocked by a piece of paper or the surface of the human skin, but gamma rays can penetrate much deeper, requiring dense materials like lead or concrete for shielding.
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Which noble gas would most likely form a compound with fluorine?
There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds. Xe can combine with fluoride and oxide to form compounds.
What is noble gas ?Under standard conditions, the noble gases are all odorless, colorless, monatomic gases with very low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six naturally occurring noble gases.
In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. Noble gases are so named because they are so magnificent that they do not react with anything in general. Because of this, they are also known as inert gases.
Noble gases, which are most commonly found as monatomic gases, have completely filled outer electron shells and thus have no desire to react with other elements, resulting in very few compounds.
Thus, There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds.
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If the volume occupied by 0.500 mol of nitrogen gas at 0°C is 11.2 L, then the volume occupied by 2.00 mol of nitrogen gas at the same temperature and pressure will be:
A. the data given is not sufficient to determine the volume
B. 22.4 L
C. 44.8 L
D. the same as that occupied by 0.500 mol of nitrogen gas
Natural gas is primarily composed of ________. natural gas is primarily composed of ________. methane sulfur dioxide nitrogen oxygen nitrite
Natural gas is primarily composed of methane, which is a colorless, odorless, and highly flammable hydrocarbon produced through the natural decomposition of organic materials.
Explanation:Natural gas is primarily composed of methane. Methane, abbreviated as CH4 or carbon tetrahydrate, is a hydrocarbon that is a main component of natural gas. The natural process of decomposition of organic materials in the lack of oxygen forms methane. This gas is colorless, odorless, and highly flammable. Ensuring safety for use in homes, a rotten egg-like smell is often added to it.
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An enzyme is a protein that acts as a catalyst in a chemical reaction that takes place in a living thing true or false
Why are valence electrons important? Why do elements bond? What are two ways elements complete their valence?
1. Versions of atoms with different amounts of neutrons are called ________.
What is the correct form of the equilibrium constant for the reaction of hydrogen and oxygen to form water? the equation is:?
Krypton-79 has a half-life of 35 hours. how many half-lives have passed after 105 hours?
Three half-lives of Krypton-79, which has a half-life of 35 hours, have passed after a period of 105 hours.
Explanation:The concept underlying the question is related to the half-life of a radioactive substance. The half-life is the amount of time it takes for half of the substance to decay. Therefore, in the situation described in the question, the half-life of Krypton-79 is 35 hours.
If we have a time period of 105 hours, we can find the number of half-lives that have passed by dividing the total time by the half-life. So, 105 hours divided by 35 hours per half-life equals 3.
Therefore, 3 half-lives have passed in 105 hours for Krypton-79.
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What does the half-life of a radioisotope correspond to?
The half-life of a radioisotope corresponds to the length of time required for half of a sample of radioactive material to decay
1. What is the pH of a 0.085 M solution of nitrous acid (HNO2) that has a Ka of 4.5 × 10-4?
2.21
5.33
3.35
4.42
how are homologous structures such as forelimbs evidence for evolution ?
The study of the gradual change of an organism over a period of time is called evolution.
What is a homologous organ?Those structures of different species which have the same structure but the different function is called homologous organ.According to the question, the forelimbs are great evidence of evolution because the forelimbs give the ancestral connection between two species.
For example - the forelimbs of the bat and the human have the same structure but different functions.
Hence, the correct answer is mentioned above.
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N2 (g) + 3H2 (g) -->2 NH3 (g) The equation above is the equation for the Haber process. In a certain reaction, you start with 3.0 moles of nitrogen and 5.0 moles of hydrogen, How much of the excess reactant will be left over after the reaction?
H₂ is in excess and N₂ will be completely consumed in the reaction.
Explanation:According to the balanced equation, 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃. In this particular reaction, you have 3.0 moles of N₂ and 5.0 moles of H₂. To determine the limiting reactant, you need to compare the moles of each reactant to the stoichiometric ratio. In this case, the ratio of moles of N₂ to H₂ is 1:3. Since you have more moles of H₂ (5.0) compared to the stoichiometric ratio, H₂ is in excess. Therefore, all of the N₂ will be completely consumed and there will be no N₂ left over after the reaction.
Which formulas and their respective names match? I) Li3N lithium nitride II) H2S hydrogen sulfite III) SO2 sulfur dioxide IV) AlF3 aluminum trifluoride
a.I and II
b.I and III
c.II and IV
d.I, II, and III?
Answer: The correct answer is Option b.
Explanation:
Ionic compound is defined as the compound which is formed by the complete transfer of electrons from one atom to another atom. These compounds are usually formed between metals and non-metals.
Covalent compounds are defined as the compounds which are formed by the sharing of electrons between two atoms. These compounds are formed between two non-metals.
The nomenclature of covalent compound is given by:
The less electronegative element is written first.The more electronegative element is written then, and a suffix is added with it. The suffix added is '-ide'.If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on..The nomenclature of ionic compounds is given by:
Positive ion is written first.The negative ion is written next and a suffix is added at the end of the negative ion. The suffix added is '-ide'.For the given compounds:
(I) [tex]Li_3N[/tex]: This is an ionic compound and hence, its name is lithium nitride.
(II) [tex]H_2S[/tex]: This is a covalent compound and hence, its name is hydrogen sulfide.
(III) [tex]SO_2[/tex]: This is a covalent compound and hence, its name is sulfur dioxide.
(IV) [tex]AlF_3[/tex]: This is an ionic compound and hence, its name is aluminium fluoride.
Hence, the correct answer is Option b.
A 20.9 ml sample of 0.267 m koh solution required 29.1 ml of aqueous acetic acid solution in a titration experiment. calculate the molarity of the acetic acid solution. answer in units of m.
If 22.50 mL of a sodium hydroxide solution is necessary to neutralize 18.50 mL of a 0.1430 M HNO3 solution, what is the concentration of the NaOH? (Report your answer in molarity.)
what is the molarity of a 650. mL solution containing 64 grams of NaCl?
As the moisture-rich air approaches the mountain, it rises and cools, and water molecules in the air combine to form small drops. the process where water vapor becomes a liquid is called ____________
What's the definition of ions
Which equation represents the half-reaction that takes place at the fork?
If 25.0 ml of seawater has a mass of 25.895 g and contains 1.295 g of solute, what is the mass/mass percent concentration of solute in the seawater sample? 5.18% 5.001% 3.862% 96.5% 20.00%
What number of moles of solute are present in 25.0 mL of 2.00 M HCl?
The number of moles of solute that are present in 25.0 mL of 2.00 M HCl is equal to 0.05 moles.
How do we calculate moles from molarity?Molarity (M) of any solution is define as the number of moles (n) of solute present in per liter of the solution (V) and represented as:
M = n/V
Given that, Volume of solution = 25mL = 0.025L
Molarity of HCl = 2M
Moles = (2)(0.025) = 0.05 moles
Hence required moles of solute are 0.05 moles.
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Suppose you wish to make 0.879 l of 0.250 m silver nitrate by diluting a stock solution of 0.675 m silver nitrate. how many milliliters of the stock solution would you need to use?
Answer is: 325.5 mL of the stock solution.
c₁(AgNO₃) = 0.675 M.
V₂(AgNO₃) = 0.879 L.
c₂(AgNO₃) = 0.250 M.
V₁(AgNO₃) = ?
c₁ -
original concentration of the solution, before it gets diluted.
c₂
- final concentration of the solution, after dilution.
V₁
- volume to
be diluted.
V₂ - final volume after
dilution.
c₁ · V₁ = c₂
· V₂.
V₁(AgNO₃) = c₂ · V₂ ÷ c₁.
V₁(AgNO₃) = 0.250 M · 0.879 L ÷ 0.675 M.
V₁(AgNO₃) = 0.325 L · 1000 mL = 325 mL.
To make 0.879 l of 0.250 m silver nitrate from a 0.675 m stock solution, use the relationship between initial and final concentrations and volumes (M1V1 = M2V2). By substituting the given values and solving for V1, we can find the needed volume of the stock solution in liters and then convert that volume to milliliters by multiplying by 1000.
Explanation:To answer this question, we need to use the formula related to molarity (M = moles/liters), which is M1V1 = M2V2. It is a relationship between the initial concentration (M1) and volume (V1) of stock solution and the final concentration (M2) and volume (V2) of dilute solution.
In this case, the student wishes to make 0.879 l (V2) of 0.250 m (M2) silver nitrate by diluting a stock solution of 0.675 m (M1) silver nitrate. Substituting these values into the formula M1V1 = M2V2, we can find the volume of the stock solution needed (V1).
So, the calculation would be: (0.675 M) V1 = (0.250 M)(0.879 L).
To solve for V1, divide both sides by 0.675 M and the result is: V1 = (0.250 M)(0.879 L) / 0.675 M. This gives the volume of the stock solution you need to use in liters. To convert this to milliliters (since the question asked for the volume in milliliters), multiply by 1000.
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A sample of oxygen gas has a volume of 150. milliliters at 300 k. if the pressure of the sample is held constant and the temperature is raised to 600 k, the new volume of the sample will be
Answer:
The new volume of the sample will be 300 milliliteres
Explanation:
We were given the following;
Initial Volume (V1) = 150ml
Initial Temperature (T1) = 300K
Final Temperature (T2) = 600K
Final Volume (V2) = ?
Pressure is held constant.
The law applicable in solving this question is that of Charle's law. This law states that the volume of a fixed mass of gas varies proportional to the temperature at constant pressure.
The formula is given as;
[tex]\frac{V1 }{T1} = \frac{V2 }{T2}[/tex]
Solving for V2. we have;
[tex]V2 = \frac{V1T2}{T1}[/tex]
V2 = ( 150 * 600) / 300
V2 = 300 ml
What is the ph of an acetic acid solution if 10 drops are titrated with 70 drops of a 0.65 m koh solution? (ka for acetic acid = 1.8 x 10-5)?
When a chemical reaction occurs, the physical and chemical properties of the reactants are the same as the properties of the products. truefalse?
Answer:
False
Explanation:
You definitely won't see this nor need this but the Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction.
I believe the answer is false
Number of moles in 11.82 g gold
Final answer:
The number of moles in 11.82 g of gold is calculated by dividing the mass of the gold by its molar mass. The atomic weight of gold is approximately 197 g/mol, so the calculation is 11.82 g divided by 197 g/mol.
Explanation:
The calculation of the number of moles in a given mass of a substance is a fundamental concept in chemistry. The number of moles (n) can be determined using the formula:
n = mass (g) / molar mass (g/mol)
For gold (Au), the atomic weight is approximately 197 g/mol, which is its molar mass. Therefore, to find the number of moles in 11.82 g of gold, you divide the mass of the gold by the molar mass of gold as follows:
n = 11.82 g / 197 g/mol
This calculation will give you the number of moles of gold in the sample. The density of gold and Avogadro's number are not directly needed for this calculation, but they are commonly referenced when discussing the properties of elements and the mole concept.
Scientists have been able to insert genes from bacteria into the DNA of corn plants. This gives some species of corn additional resistance to pests. Why would this breakthrough be beneficial to humans?
A. Farmers will increase their use of chemicals that kill pests.
B.Less chemical residue will be found in the air and water.
C.Bacteria will flourish inside the corn plants.
D.The corn will cause illness in humans or animals.
E.The amount of corn produced per acre of farmland will decrease.
Scientists have been able to insert genes from bacteria into the DNA of corn plants. This gives some species of corn additional resistance to pests.
This would breakthrough be beneficial to humans as " less chemical residue will be found in the air and water"
What is DNA?Deoxyribonucleic acid (DNA) is just a polymer made up of two polynucleotide chains whose coil around with each other to create a double helix which carries genetic instructions including all living things and viruses' formation, function, growth, but also reproduction.
What is chemical residue?The remnants of a chemical or even its decomposition products may remain in or on prepared produce and are referred to as chemical residues. Chemical residues could form as a result of directly processing produce with either a chemical product or as a result of chemical exposure.
Therefore, the correct answer will be option (B).
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