Answer:
Approximately [tex]4.5\; \text{hours}[/tex].
Explanation:
Calculate the ratio between the mass of this sample after [tex]22.5\; \text{hours}[/tex] and the initial mass:
[tex]\displaystyle \frac{5.70\; \rm g}{182.4\; \rm g} \approx 0.03125[/tex].
Let [tex]n[/tex] denote the number of half-lives in that [tex]22.5\; \text{hours}[/tex] (where [tex]n\![/tex] might not necessarily be an integer.) The mass of the sample is supposed to become [tex](1/2)[/tex] the previous quantity after each half-life. Therefore, if the initial mass of the sample is [tex]1\; \rm g[/tex] (for example,) the mass of the sample after [tex]\! n[/tex] half-lives would be [tex]{(1/2)}^{n}\; \rm g[/tex]. Regardless of the initial mass, the ratio between the mass of the sample after [tex]n\!\![/tex] half-lives and the initial mass should be [tex]{(1/2)}^{n}[/tex].
For this question:
[tex]{(1/2)}^{n}} = 0.03125[/tex].
Take the natural logarithm of both sides of this equation to solve for [tex]n[/tex]:
[tex]\ln \left[{(1/2)}^{n}}\right] = \ln (0.03125)[/tex].
[tex]n\, [\ln(1/2)] = \ln (0.03125)[/tex].
[tex]\displaystyle n = \frac{\ln(0.03125)}{\ln(1/2)} \approx 5[/tex].
In other words, there are [tex]5[/tex] half-lives of this sample in [tex]22.5\; \text{hours}[/tex]. If the length of each half-life is constant, that length should be [tex](1/5) \times 22.5\; \text{hours} = 4.5\; \text{hours}[/tex].
2) A container has an unknown quantity of gas at a pressure of 61.6 kPa, a volume of 3.9 liters, and a temperature
of 90 °C, how many moles of gas do I have?
3) A container has 23 moles of gas in a container with a volume of 500 liters and at a temperature of 298 K, what
is the pressure inside the container?
4) A barrel has 19 moles of gas at a pressure of 20.5 atm and at a temperature of 25 °C, what is the volume of the
container that the gas is in?
Answer:
3
Explanation:
40 points, please help I seriously cannot fail this class and I am extremely confused. All you have to do is solve using dimensional analysis. If you can type some form of work that would be helpful. I will go answer a question on yours as well also.
Answer:
the answer to the first is 5.5 meters :)
what is the difference between aluminum phosphide and aluminum phosphate?
Answer:
The answer is below
Explanation:
Here some of the difference between aluminum phosphide and aluminum phosphate
1. Aluminum phosphide is a crystalline solid with either dark gray or yellow color. While Aluminum Phosphate is in a nanopowder form but with a whitish color.
2. Aluminum phosphide is used in the fumigation of plants, while Aluminum phosphate is used in cosmetics, paints, etc.
3. Aluminum phosphide has a compound formula of AlP with a molar mass of 57.9552 g/mol, while Aluminum Phosphate has a compound formula of AlO4P with a molar mass of 121.9529 g/mol
An element gains 3 electrons to become stable. What is the new ion's charge?
+3
-3
+5
-5
In which directions does liquid pressure act
Urgent please answer properly there are no answer choices.
What is the relationship between land use in general and deforestation?
The term deforestation denotes the change of intended land use from forest to non-forest (urban, agricultural, etc.), as distinct from the cutting of selected tree stems. ... Thus the global net change in forest cover is the sum of all positive and negative changes in forest area (increases and decreases).
A high speed train travels 176 miles in 7 hours. What is the speed of the train
in mph? Enter your answer a just a number without units.
Answer:
25 mph
Explanation:
So we have to find the unit rate, or you could use the DTS triangle, but both say you have to divide, so our equation is:
176 ÷ 7 = 25.14
But I'm going to round that
So the train is traveling at 25 mph
hope this helps:/
Name three uses for nuclear reactions.
Answer:
Radioisotopes, nuclear power process heat and non-stationary power reactors have essential uses across multiple sectors, including consumer products, food and agriculture, industry, medicine and scientific research, transport, and water resources and the environment.
Explanation:
careful it was copied dont want you to get in trouble for copy right :)
The characteristics of nuclear reactions allow to find some uses:
Fission reactions:
Electric power Radioisotopes Radurizationfusion reactions is development energy production
Nuclear reactions are reactions where atoms are transformed into other atoms, they can be of two types
Fusion. Where light atoms unite to form heavy atoms, this type of process is in the research stage and has no current uses, but in the future it could be a great source of energy. Fission. In this process, unstable heavy atoms are divided into lighter atoms, more stable, this process has several uses today.
Let's describe some of the uses of nuclear fission processes.
Electric power production, this is highly controversial because of very long term radioactive waste. Production of isotopes this process is highly used in industry and medicine Creation by the emitted particles of radioactive elements that are used in industry and medicine.
Radurization processes by which emitted gamma rays kill viruses and bacteria in surgical and medical material mainly, it is also used when transporting vegetables and plants between countries.
In conclusion the characteristics of nuclear reactions we can find the uses:
Electric power Radioisotopes Radurization
Learn more here: brainly.com/question/6572079
temperature is a measure of the ______ of an object. 1. kelvin 2. insulator 3. average KE 4. radiation 5. specific heat
Answer:
5
Explanation:
Temperature calculates heat/the temperature in the specific location.
please help me..
what is carbon 1/12
Answer:
It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of 12 units. ... In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.
How would you create a positive charge?
Answer:
When electrons are transferred to or removed from an object.
Explanation:
Because electrons have a negative charge, when they are added to an object, it becomes negatively charged. When electrons are removed from an object, it becomes positively charged.
An element has an atomic number of 17. Calculate the mass of an atom of this element. (Avogadro constant is 6.022x10^23 atoms/mol.)
Answer:
2.82 * 10^-25 g
Explanation:
Given that :
Atomic number = 17
Mass of an atom of the element =?
Avogadro's constant = 6.022 * 10^23
The mass of an atom. Of the element is :
Atomic mass / Avogadro's constant
= 17 / 6.022 * 10^23
= 2.82 * 10^-25
=
if atoms are so tiny how do we know they exist
There are three ways that scientists have proved that these sub-atomic particles exist. They are direct observation, indirect observation or inferred presence and predictions from theory or conjecture. Scientists in the 1800's were able to infer a lot about the sub-atomic world from chemistry.
PLEASE HELP IM FAILING AND TODAY IS THE LAST DAY!! PICTURE PROVIDED!!
In your graph, which variable went on the x-axis? Which variable went on the y-axis? Explain why for both.
Answer:
Since the trials depend on the number of shakes, trials is the DEPENDENT VARIABLE and shakes is the INDEPENDENT VARIABLE as something depends on it.
Independent is on the X axis
Dependent is on the Y axis
What is the smallest piece of compound you can have?
Answer:
the answer is molecule
A compound is a substance that consists of two or more elements in a unique composition. The smallest particle of a compound is called a molecule. Chemical bonds hold together the atoms of molecules. Compounds can form only in chemical reactions, and they can break down only in other chemical reactions.
Explanation:
5. What energy transformations take place in a simple electric motor?
B. kinetic --> electric
O C. electrical --> kinetic
D. light --> electrical
A. chemical --> solar
Answer:C. electrical --> kinetic
Explanation:
an electric motor converts electrical energy into mechanical energy through the process of electromagnetic induction
Answer:
C
Explanation:
the electric motor converts the electrical power to mechanical power ..
Rank the three types of bonds - ionic, polar covalent and nonpolar covalent - from
strongest to weakest. Justify your answer.
The order of strongest to weakest bond type:
Ionic bond > Polar covalent bond > non polar covalent bond
Explanation:
Ionic bonds are chemicals bonds in which the complete transfer of electrons takes place between a highly electronegative atom and the least electronegative atom.In an ionic bond, there is a strong electrostatic force of attraction due to the formation of two oppositely charged ions.Covalent bonds are chemicals bonds in which the sharing of electrons takes place between atoms with a slight or nil difference in their electronegativities.There are two types of covalent bonds: polar covalent and nonpolar covalent.In polar covalent bonds, due to unequal sharing of electrons partial positive and negative charges are generated.These partial charges give rise to a temporary attractive force of attraction between atoms in polar covalent bonds.In non-polar covalent bonds, equal sharing of electrons between atoms of the same or similar electronegativities.The order from strongest to weakest chemical bond:Strong electrostatic force> temporary attractive force> no force of attraction
Ionic bond > Polar covalent bond > non polar covalent bond
So, from this, we can conclude that the order of ionic bond is the strongest followed by a polar covalent bond and then a nonpolar covalent bond.
Learn more about types of chemical bonds here:
brainly.com/question/1802971?referrer=searchResults
brainly.com/question/820400?referrer=searchResults
PLZ HELP, I WILL MARK THE BRAINLIEST!!!!
Answer: a. 4
B 2
C 9
Explanation:
Which statement best describes comparative and descriptive investigations?
Answer:
they both include a question, procedure and conclusion.
Explanation:
How do you test for starch in green plant
Answer:
1,Iodine solution is used to test leaves for the presence of starch. ...
2.After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
3.The leaf on the left is a variegated leaf
Explanation:
Answer:
1.Iodine solution is used to test leaves for the presence of starch. ...
2.After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.
3.The leaf on the left is a variegated leaf.
1) A container has 5 moles of a gas at a pressure of 9.6 atm and a volume of 2.5 liters, what is the temperature?
Which of these organelles is found in a plant cell only
A. Mitochondria
B. Cytoplasm
C. Cellwall
D. Golgi Body
Answer:
c. cellwall
Explanation:
Answer:
C.) Cell Wall
Explanation:
HHHAAAAALLLPPPP
It’s due tomorrow
Answer:
D.
Explanation:
Only 0.0035% of the electromagnetic spectrum is visible to the human eye
Hopefully this helped :)
Why is copper used in the manufacture of computers?
IBM and others are using copper instead of aluminum in the most powerful computer chips they manufacture. Because of copper's superior electrical conductivity, this technology enables conductor channel lengths and widths to be significantly reduced.
Answer: IBM and others are using copper instead of aluminum in the most powerful computer chips they manufacture. Because of copper's superior electrical conductivity, this technology enables conductor channel lengths and widths to be significantly reduced.
Aplant whose seeds are exposed rather than protected by fruit is called sli)
A plant that has Neers and whose seeds are protected by fruit is called sly)
Answer:
Ik Gymnosperms
Explanation:
term that means naked seeds
Answer:
gymnosperm and angiosperm
Explanation:
Are hybrids made by natural selection or artificial selection?
Answer:
natural selection
Explanation:
hybrid incompatibility does not evolve because of direct natural selection for hybrid incompatibility, but is instead a by-product of other evolutionary divergence between the species
Carlos is making phosphorus trichloride using the equation below. He uses 15.5 g of phosphorus and collects 50.9 g of phosphorus chloride.
2P +3Cl2 2PCl3
How much chlorine reacted with the phosphorus?
15.5 g
17.7 g
35.4 g
66.4 g
Answer: 35.4 g
2 moles of phosphorous chloride are produced by = 3 moles of
Thus 0.37 moles of phosphorous chloride are produced by= of
Mass of
Thus 35.4 g of chlorine reacted with the phosphorus
when water is pushed out of the way it is said to be____________________.
I don’t know this question help me please
What is the molecular formula for CH2 with molar mass 90 g/mol?
Answer:
CH2: (1×12g/mol)+(2×1g/mol)=14 g/mol.
