According to table N, the isotopes uranium-238 and uranium-235 have different half lives.
What are radioactive nuclides?Radioactive nuclides are those nuclides that are able to undergo radioactive decay. They have specific modes of decay that is peculiar to each isotope.
Hence, according to table N, the isotopes uranium-238 and uranium-235 have different half lives.
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When balancing chemical equations the left hand side of the equation is known as the ______, while the right hand side is known as the ______.
Answer:1# reactants 2#coefficient
Explanation:
A gas bubble has a volume of 0.650 mL at the bottom of a lake, where the pressure is
3.46-atm. What is the volume of the bubble at the surface of the lake, where the pressure is
1.00-atm? Assume that the temperature is constant. Will the new volume be bigger or smaller?
Considering the Boyle's law, as the pressure decreases, volume increases and has a value of 2.246 mL.
Boyle's lawBoyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant.
This law says that the volume occupied by a given mass of gas at constant temperature is inversely proportional to the pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
Boyle's law is expressed mathematically as:
P×V=k
If an initial state 1 and a final state 2 are analyzed, Boyle's law is expressed as:
P1×V1=P2×V2
Volume at the surface of the lakeIn this case, you know:
P1= 3.46 atmV1= 0.650 mLP2= 1 atmV2= ?Replacing in Boyle's law:
3.46 atm× 0.650 mL= 1 atm×V2
Solving:
V2= (3.46 atm× 0.650 mL)÷ 1 atm
V2= 2.246 mL
Finally, as the pressure decreases, volume increases and has a value of 2.246 mL.
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What would be the minimum energy Emin required to excite a hydrogen atom from its lowest energy level
The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
What is excitation?The term excitation has to do with the promotion of an electron from a lower to a higher energy level.
In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.
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If 0.094 moles of magnesium react with excess oxygen, how many moles of magnesium oxide would be formed?
The equation for this reaction is
[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]
This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.
So, the answer is 0.094 moles.
what is the last letter letter that comes after this word in chemistry
the answer is Ethane
hope it helps...!!!
the answer is Ethane
hope it helps...!!!
How is polypropylene commonly used?
What is the molarity of a solution in which 102 grams of aluminum oxide, Al2O3, is
dissolved in 500 mL of solution?
Answer:
2.00 M
Explanation:
The formula mass of aluminum oxide is 2(27)+3(16)=102 g/mol.
So, there is 1 mole of solute in 500 mL=0.5 L of solution
Now, we can use the equation molarity = (moles of solute)/(liters of solution)
molarity = 1/0.5 = 2.00 MWhich of the following lists electromagnetic radiations from lowest to highest energy?
Your answer:
radio waves, microwaves, ultraviolet radiation, visible light
microwaves, radio waves, visible light, X-rays
radio waves, infrared radiation, visible light, ultraviolet radiation
gamma radiation, infrared radiation, visible light, X-rays
Answer:
Highest wavelength : radio waves
So lowest energy: radio waves
Hence order is:
radio waves < microwaves < IR waves < visible light < ultraviolet radiation < X-rays < gamma rays
How many moles are in 8.35 g of H2O?
(show all work)
Answer: 0.463 mol (to 3 sf)
Explanation:
The atomic mass of hydrogen is 1.00794 g/mol.The atomic mass of water is 15.9994 g/mol.So, the mass of water is 2(1.00794)+15.9994 = 18.01528 g/mol.
This means that in 8.35 grams of water, there are:
8.35/18.01528, which is 0.463 mol (to 3 sf)It is easier to determine the electron configurations for the p-block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p-block elements in the periodic table because.
Answer:
See Explanation
Explanation:
Because you have to get through the d-block electron configurations for the rest of the p-block elements which is a hassle to do. You need to know how to account for electron stability, from which subshell to remove electrons, etc. because it is all weird for d-block.
what is mean by saturated solution and unsaturated solution
•Saturated Solution: A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called a saturated solution.
Example: A soda is a saturated solution of carbon dioxide in water. This is why, when the pressure is released, carbon dioxide gas forms bubbles.
•Unsaturated solution: It is a solution in which more of solute can be dissolved at a given temperature. In this, addition of solute is possible till the solution reaches the point of saturation.
Example: Salt dissolved in water even sugar dissolved in water is an Unsaturated solution if the quantity of dissolved Salt/Sugar is below the saturation point.
[tex]\boxed{\sf{ \purple☘Saturated \: Solution\purple☘} }[/tex]
A solution that contains the maximum amount of solute that is capable of being dissolved.
[tex]\pink★[/tex]Example : 36g of salt in 100g of water
[tex] \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex]\boxed{\sf{ \purple☘Unsaturted \: Solution\purple☘}}[/tex]
A solution in which more solute can be dissolved.
[tex]\pink★[/tex]Example : The solution of sugar, salt etc in water.
Research some metal ores and what the extracted metals are used for?
(besides copper)
Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.
What are metals?In engineering, metals are characterized to have electrical conductivity and other properties (e.g., ductility, reflectivity, etc).
For example, Lithium can be defined as soft metal (alkali metal) that is suitable to store electrical energy.
In conclusion, Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.
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Which change happens when a substance melts? (1 point)
The molecules of the substance move farther apart, which pulls on the intermolecular bonds between them.
Heat energy forces the molecules of the substance farther apart until the rigid structure of the solid breaks.
Heat energy overcomes the forces of attraction between the molecules of the substance, so the molecules can move more
freely.
The vibration of the molecules produces enough heat to weaken the forces of attraction between the molecules of the
substance.
Answer:
The molecules of the substance move further apart which pulls on the intermolecular bonds between them
Explanation:
because it said it was right
How many atoms are contained in 100.0 g of mercury
3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.
What is moles?The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”
Number of moles of mercury = [tex]\frac{mass}{molar \;mass}[/tex]
Number of moles of mercury = [tex]\frac{100.0 g}{200.59 u}[/tex]
= 0.4985 moles
Number of moles of mercury = Number of atoms = moles of Hg x [tex]6.02 X 10^{23}[/tex]
= 0.4985 x [tex]6.02 X 10^{23}[/tex]
= 3.00097 x [tex]10^{23}[/tex] atoms.
Hence, 3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.
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Can anyone please help me find molar masses of compounds. For example Copper (ll) sulfate (CuSO4)
Answer:
Explanation:
You would have to add up the atomic masses of all the compounds in the compound, making sure you include how many molecules of each are in the compound
For example, in CuSOA we have 1 molecule of Cu and S, as 4 molecules of O
The atomic masses are as follows:
Cu = 63.55 u
S = 32.065 u
O = 15.99 units
This is how we would add it up:
(Atomic mass of Cu) + (Atomic mass of S) + 4(Atomic Mass of O)
(63.55) + (32.065) + 4(15.99)
(63.55) + (32.065) + 63.96
= 159.575 u
Which is a characteristic of nuclear fission?
According to the postulates of kinetic molecular theory, which statement describes the movement of the particles of a liquid?
According to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
What is the Kinetic theory of matter?The Kinetic theory of matter states that all forms of matter are made up of tiny particles which possess kinetic energy and are in constant state of motion.
The strength of the forces keeping the particles together determines the state in which that substance exists in.
For liquids, the intermolecular forces of attraction between between the molecules are not very strong, and as such, the particles of a liquid are in constant state of random motion.
Therefore, according to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
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difference between an Argon atom with a mass number of 38 (Ar-38) and another Argon atom with a mass number of 45 (Ar-45)?
The difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.
What is Isotope?
Isotopes are two or more types of atoms of the same element that have the same atomic number but differs in mass numbers due to different numbers of neutrons in their nuclei.
Argon atom with a mass number of 38 (Ar-38) - number of neutrons = 20
Argon atom with a mass number of 45 (Ar-45) - number of neutrons = 27
Thus, the difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.
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Balancing Equations?
CrO3 → Cr₂O3 +0₂
Answer:
2CrO3→Cr₂O3 +0₂
Explanation:
that's the correct balancing
Balance the following equation.
[tex] \small\sf{ CrO_{3} → Cr_{2}O_{3} + O_{2}}[/tex]
Explanation -:[tex] \underline{ \boxed{ \small\frak{ Law \: of \: conservation \: of \: mass}}}[/tex]
The law of conservation of mass was put forward by Antoine Laurent Lavoisier. Law of conservation of mass states that matter is neither created nor destroyed during a chemical reaction. This means that there is no change in mass during a chemical reaction.
[tex] \small\sf{ CrO_{3} → Cr_{2}O_{3} + O_{2}}[/tex]
Word equation
[tex] \small\mathbb{ Chromium \: Trioxide = Dichromium \: Trioxide + Dioxygen}[/tex]
Reactant :
Chromium Trioxide = CrO3
Product :
Dichromium Trioxide + Dioxygen = Cr2O3 + O2
Balanced equation.
[tex] \small\sf{4CrO_{3} = 2Cr_{2}O_{3} + 3O_{2}} [/tex]
Three examples where is helpful to have a low reaction rate
Explanation:
combustion of fuels
digestion of food
cooking of food
Which of the following would be appropriate reason(s) for scientists to reject atomic theory?
evidence that John Dalton did not give credit to others who helped him develop the theory
evidence that some kinds of matter are made up of waves instead of particles
observations that cannot be explained by the theory
observations that are predicted by the theory
The appropriate reasons for scientists to reject atomic theory are :
Evidence that some kinds of matter are made up of waves instead of particles ( B )Observations that cannot be explained by the theory ( C )What is atomic theory ?
Atomic theory states that every material substance is composed of similar minute particles known as atoms which share the same properties. these particles ( atoms ) bound together to form a matter.
Matter is composed of particles ( atoms ) and not wave also certain observations that cannot be explained will lead to the discredit of the atomic theory.
Hence we can conclude that The appropriate reasons for scientists to reject atomic theory are : Evidence that some kinds of matter are made up of waves instead of particles and Observations that cannot be explained by the theory
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What happens when an electron absorbs photons? OA. It changes into a neutron and falls into the nucleus. B. It moves to a higher energy level. OC. It changes into an alpha particle and is ejected from the atom. OD. It falls to a lower energy level.
When an electron absorbs photons it moves to a higher energy level.
What happens when an electron absorbs photons?
Absorption of photons occurs when electrons in a given state absorb photons which causes them to gain energy and jump to higher energy levels.
The electrons will move to higher energy level because they have acquired more energy.
Thus, when an electron absorbs photons it moves to a higher energy level.
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no.of atoms in 12g of He
Answer:
hope this will help you......
Assume that heating a 3.50g sample of the hydrate of copper (II) sulfate yields 2.10g of anhydrous copper (II) sulfate. What is the mass percent of water in the hydrate?
If a 3.50g sample of the hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate, the mass percent of water in the hydrate is 40%.
How to calculate mass percent?The mass percent of hydrate in a sample can be calculated by dividing the mass of water in the sample by the mass of the hydrated compound.
According to this question, 3.50g sample of an hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate. The mass percent of water is calculated as follows:
Mass percent of water = (3.5-2.1)/3.5 × 100
Mass percent of water = 40%
Therefore, if a 3.50g sample of the hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate, the mass percent of water in the hydrate is 40%.
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Find an example of an ester used as a fragrance or flavoring and give the name, condensed structural formula, and flavor of your chosen ester.
The example of an ester used as a fragrance is isopentyl acetate and it is present in banana. Details about esters can be found below.
What are esters?Esters are compounds most often formed by the condensation of an alcohol and an acid and has the functional group carbon-oxygen double bond joined via carbon to another oxygen atom.
Esters are naturally found in certain fruits and can be used as major constituent of perfumes. An example of ester used as fragrance is isopentyl acetate.
Isopentyl acetate has the molecular formula of C7H14O2 and has a banana flavor.
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You find that it takes 23 mL of 0.0150 M nitric acid to neutralize 18 mL of a barium
hydroxide solution. What is the molarity of the base ?
Answer: 0.02 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(23)(0.0150)=(18)M_{B}\\M_{B}=\frac{(23(0.0150)}{18} \approx \boxed{0.02 \text{ M}}[/tex]
What atom requires the greatest amount of ionization energy na or mg
Answer:
Mg
Explanation:
Mg requires more ionization energy to ionize because it has more protons than Na. If an atom, located within the same period, has more protons, the pull on the electrons will be greater. This makes it more difficult to remove these electrons during ionization.
As a general rule, ionization energy decreases as you go down a column and increases as you move to the right on the periodic table. Therefore, the elements with the highest ionization energies are located on the top right of the periodic table. Ionization energies increase across a group due to the quantity of protons increasing. Ionization energies decrease as you go down a column because the outermost electrons are further from the nucleus (where the protons are), making it easier to remove them.
V2 = (P1 × V1 × T2) (P2 × T1) A gas with a beginning pressure of 2 atm at a temperature of 300 K has a volume of 20 ml. What will be the new volume if the pressure increases to 4 atm and the temperature is lowered to 200 K?
6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1=20 ml[/tex]
[tex]T_1=3[/tex]
[tex]P_1=2 atm[/tex]
[tex]T_2=200 K[/tex]
[tex]P_2=4 atm[/tex]
[tex]V_2=?[/tex]
Using equation:
[tex]V_2 =[/tex] [tex]\frac{P_1 X V_1 XT_2}{P_2 X T_1}[/tex]
[tex]V_2 =[/tex][tex]\frac{2 atm X 20 ml X200 K}{4 atm X 300 K}[/tex]
[tex]V_2 = 6.6 ml[/tex]
Hence, 6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
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Name and Title:
Include your name, instructor's name, date, and name of lab.
Objectives(s):
In your own words, what is the purpose of this lab?
Hypothesis:
In this section, please include the predictions you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the elements present in each unknown astronomical object. Be sure to indicate “yes” or “no” for each element.
Hydrogen Helium Lithium Sodium Carbon Nitrogen
Moon One
Moon Two
Planet One
Planet Two
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab.
Astronomers use a wide variety of technology to explore space and the electromagnetic spectrum; why do you believe it is essential to use many types of equipment when studying space?
If carbon was the most common element found in the moons and planets, what element is missing that would make them similar to Earth? Explain why. (Hint: Think about the carbon cycle.)
We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars?
Why might it be useful to determine the elements that a planet or moon is made up of?
Answer:
I don't no this answer do you know then telle
what id the study of living things called
Answer:
biology
Explanation:
bi- means life and ology means study of