After one half life, 188mg
46.9 mg of Ba-142
After 5 half lives
After 106 minutes
20 half lives , only 0.000358 mg remains
Hope this helps
The given statement could be filled in as follows:
After one half-life, 188mg
46.9 mg of Ba-142 After 5 half-lives
After 106 minutes 20 half-lives, only 0.000358 mg remains.
What is half-life?Half-life is described as the meantime necessary of 1/2 of radioactive decomposition's sample to break up.
In the given study,
Amount of Radiocontrast dye [tex]= 375 mg[/tex]
Half-life [tex]= 10.6[/tex] minutes
Therefore,
The amount left post 1 half-life = 188 mg
Now,
The amount left post 5 half-lives [tex]= 46.9 mg[/tex]
Lastly,
The amount left post 20 half-lives [tex]= 0.000358 mg[/tex]
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When two or more substances are physically combined the result is a:.
Answer:
I think it is called a Mixture
Explanation:
Sorry if it is wrong
The Steller sea lion population has been decreasing in parts of Alaska. New evidence suggests that Steller sea lions need herring as a part of their diet in order to survive. Pollock, another type of fish, also feed on herring. Which would most likely help the Steller sea lion population to increase?
Answer:
Improving the habitats of herring thereby increasing their population.
Explanation:
First, two consumers (Steller sea lion and Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.
The Steller sea lion population would increase if:
1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.
2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.
I need help with an science IXl i need to go up to 8- its about comparing cells and cell parts somebody please save me!
Answer:
o cany give because of i am in 9th
Which two characteristics describe reputable digital resources?
A.They contain an author’s name.
B.They sell products and services.
C.They are created by high school students.
D.They have been updated recently.
E.They can be edited by readers.
The two best characteristic best describes the reputable digital resource are the precision and accuracy.
Explanation :The more the accuracy the better the digital product.
Any slight error on application or usage may result in severe loss on product manufacturing and also loss in application purpose.
Amylase was shown to work best at a ph of 7 in comparison of a ph of 2. If the stomach juices have a ph of 2, what do we know about the function of salivary amylase within the stomach?.
The salivary amylase did not perform well if the pH becomes lower because it needs neutral pH for performing its functions.
Effect of pH on the enzymeWe can say that the salivary amylase did not perform their function very well within the stomach due to unfavourable environment such as lower pH. Due to lower pH, the enzyme structure is damaged so unable to perform its function so we can conclude that the salivary amylase did not perform well if the pH becomes lower.
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What is the density of aluminum chloride vapor (AlCl3) at 498 K and 0.939 atm?
1.24 g/L
3.06 g/L
5.17 g/L
7.42 g/L
Answer:
3.06 g/L
Explanation:
Taking into account the definition of density and ideal gas law, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
DensityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Ideal gas lawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Density of aluminum chloride vaporFrom the Ideal gas law, you can get that:
[tex]\frac{n}{V} =\frac{P}{RxT}[/tex]
On the other side, the molar mass of substance is a property defined as the amount of mass that a substance contains in one mole. It can be expressed as:
[tex]molar mass= \frac{mass}{number of moles}[/tex]
Then, the number of moles n can be calculated as:
[tex]n=\frac{mass}{molar mass}[/tex]
So:
[tex]\frac{\frac{mass}{molar mass} }{V} =\frac{P}{RxT}[/tex]
Solving you get the expression:
[tex]\frac{mass }{V} =\frac{Pxmolar mass}{RxT}[/tex]
Considering the definition of density, you finally get:
[tex]density=\frac{Pxmolar mass}{RxT}[/tex]
In this case, you know:
P= 0.939 atmmolar mass of AlCl₃= 133.35 [tex]\frac{g}{mol}[/tex]R= 0.082[tex]\frac{atm L}{molK}[/tex]T= 498 KReplacing in the previous expression for the calculation of the density:
[tex]density=\frac{0.939 atmx133.35\frac{g}{mol} }{0.082\frac{atm L}{molK} x498 K}[/tex]
and solving you get:
density= 3.06 g/L
Finally, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
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density:
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How does the difference in the mass of the ball affects the changes in the distance of the object
Answer:
In very simple words ,
As the weight increases the gravitational force acting on the ball increases and thus it effects the change in the distance of the ball as the ball will fall very close to its initial distance if it has more mass and shall go far if the mass is less .
How many moles of Al2O3 [Aluminum oxide] is in 40g sample
Answer:
0.39 is the answer!
Chemical reactions spontaneously occur when the free energy of the products is ___________ the free energy of the reactants.
Answer:
lower
Explanation:
For a spontaneous process, the standard Gibbs free energy change has to be less than zero:
∆G° < 0 → spontaneous
∆G° > 0 → non- spontaneous
∆G° = 0 → system is at equilibrium
For a negative change in standard Gibbs free energy, the Gibbs free energy of the products has to be lower than that of the reactants since Gibbs free energy change is the standard Gibbs free energy of products minus that of the reactants.
[tex]\boxed{∆G= G°(products) -G°(reactants)}[/tex]
Mathematical derivation:
G°(products) -G°(reactants) < 0
G°(products) < G° (reactants)
✩ Note that in the image attached, the Gibbs free energy change is usually denoted by a single-headed arrow, from reactants to products.
What is free energy?
the amount of energy available to do useful workit tells us the spontaneity of a chemical processStandard state conditions
You may have noticed the superscript ° after the letter G (which stands for Gibbs free energy), and this symbol denotes standard state.implies that the pressure of a gas is 1 atmimplies that for a solute, its concentration is 1MSpontaneity
the ability of a reaction to occur without outside interventionFor example, an ice melting in a cup of hot tea is a spontaneous process (i.e. the transfer of heat from a hotter object to a cooler object is spontaneous).The haber process can be used to produce ammonia (nh3) from hydrogen gas (h2) and nitrogen gas (n2). the balanced equation for this process is shown below. 3h2 n2 right arrow. 2nh3 the molar mass of nh3 is 17.03 g/mol. the molar mass of h2 is 2.0158 g/mol. in a particular reaction, 0.575 g of nh3 forms. what is the mass, in grams, of h2 that must have reacted, to the correct number of significant figures? 0.1 grams 0.102 grams 0.10209 grams 0.1021 grams
The mass of hydrogen reacted with nitrogen to give ammonia is 0.1 grams.
How we calculate the mass from moles?
Mass of any substance will be calculated by using the moles as:
n = W/M, where
W = required mass
M = molar mass
Given chemical reaction is:
3H₂ + N₂ → 2NH₃
Moles of 0.575 g of NH₃ will be calculated as:
n = 0.575g / 17.03g/mol = 0.033 moles
From the stoichiometry of the reaction, it is clear that:
2 moles of NH₃ = produced by 3 moles of H₂
0.033 moles of NH₃ = produced by 3/2×0.033=0.0495 moles of H₂
Now we calculate the mass of hydrogen from the given moles and molar mass as:
W = (0.0495mol)(2.0158g/mol) = 0.09 grams = 0.10 grams
Hence, option (a) is correct i.e. 0.1 grams.
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Which type of substance is water able to dissolve? nonpolar ionic polar ionic and polar.
Water is able to dissolve polar or ionic solutes.
What is Water?Water is a liquid that is transparent or colourless, tasteless and odourless which form the Earth hydrosphere and can be use for fringing, cooking, washing, feeding animals and so on.
What is Polar Substance?Polar or ionic solvents dissolve polar or ionic solutes. Polar Substance are substances that can dissolve in water completely or polar solvent.
Water is a polar solvent and it can dissolve polar solute.
Therefore, Water is able to dissolve polar or ionic solutes.
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Answer:
the answer is d ionic and polar
Explanation:
just took the quiz and got it right
60 points! please help me i will appreciate it!
PLEASE HELP ASAP
Label the correct descriptors (volume, temperature, pressure, moles) *
Explanation:
1. volume
2. pressure
3. moles
4. temperature
5. temperature
6. moles
7. pressure
8. volume
9. pressure
10. volume
How is thermal energy generated?
Answer:
thermal energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
Explanation:
I'm pretty sure its that. Hope its right!
Answer:
says wrong
Explanation:
When 2 small figures are pulling in the opposite direction, their
individual forces
Answer:
To determine if the forces acting upon an object are balanced or unbalanced, an analysis must first be conducted to determine what forces are acting upon the object and in what direction. If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced
Explanation:
The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence,
predict the formulas for the compound formed from the following:
potassium and permanganate
A) K(MnO4)
B) K4MnO4
C) K4MnO
D) KMnO4
Answer: or Sodium carbonate.
or Potassium permanganate
Explanation: ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound,
Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound, Explanation:
Match these note cards and tell me with ones go to gives off carbon dioxide and does not give off carbon dioxide
Which natural polymers are involved with making clothing?
A. wool, silkworm cocoon, and cellulose
B. wool, nylon, and DNA
C. starch, nylon, and DNA
D. starch, silkworm cocoon, and cellulose
Answer:
The answer is A!!!
Explanation:
just took the quiz on edge:)
Answer:
The answer that you are looking for is A.) wool, silkworm cocoon, and cellulose
Explanation:
I got it right on edge 2020. 100%
Help I really need help and don't search it on go.ogle this is a school assignment and i can get in trouble thank you sm :)
Based on your research of nuclear energy thus far, how do you feel about the use of nuclear fission as a source of energy?
Answer:
Nuclear fission is almost 5 times times more efficient than traditional fossil fuels at producing energy. That's a lot of energy packed into a small space. Nuclear energy is more efficient, which means it uses less fuel to power the plant and produces less waste.
Explanation:
When can a metal replace another metal in a single displacement reaction?
Only if the metal replacing it is isoelectronic with the metal that is being replaced.
When it is larger in atomic mass.
Any element can always replace another element.
When it is more reactive according to the reactivity series.
Answer:
When it is more reactive according to the reactivity series.
Explanation:
Jude has a 30.00 L cylinder full of acetylene gas that he will use for welding in his workshop. If the pressure of the cylinder is 1720 kPa and the workshop is at 20.0 °C, then how many moles of acetylene are in the tank? (Show work)
Answer:
About 21.2 moles.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure of the gas; V is its volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Rearrange to solve for n:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Because R has units of L-atm/mol-K, convert the pressure to atm:
[tex]\displaystyle 1720 \text{ kPa} \cdot \frac{1\text{ atm}}{101.3\text{ kPa}} = 17.0\text{ atm}[/tex]
And convert from Celsius to kelvins:
[tex]\displaystyle \begin{aligned}T _ k & = T_C + 273.15 \\ \\ & = (20.0) + 273.15 \\ \\ & = 293.2\text{ K} \end{aligned}[/tex]
Hence substitute and evaluate:
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{\left(17.0\text{ atm})(30.00\text{ L})}{\left(\dfrac{0.08206\text{ L-atm}}{\text{mol-K}}\right)(293.2\text{ K})} \\ \\ & = 21.2\text{ mol } \end{aligned}[/tex]
In conclusion, there are about 21.2 moles of acetylene in the tank.
How might microorganisms be spread?
Answer:
Asexual reproduction
Explanation:
for microorganism to reproduce and spread, the microorganism uses a process of cell division called mitosis, where the microorganism divides it self into two individual microorganism by mitosis using Asexual reproduction (an organism dividing itself into 2 individual organism not involving sexual activities, called Asexual reproduction). for these microorganisms to be able to reproduce Asexually that makes it much faster for these organisms to spread much more faster then mammals of other Sexually reproductive organisms.
Milk, if 2.00 liters has a mass of 2.06 kg. Find the density in g/cm^3
Answer:
The answer is 1.03 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
1 kg = 1000 g
2.06 kg = 2060 g
1 L = 1000 cm³
2 L = 2000 cm³
mass = 2060 g
volume = 2000 cm³
We have
[tex]density = \frac{2060}{2000} = \frac{103}{100} \\ [/tex]
We have the final answer as
1.03 g/cm³Hope this helps you
Answer:
The density of milk is 1.03 g/cm³.
Explanation:
Given data:
Volume of milk = 2.00 L
Mass of milk = 2.06 kg
Density of milk = ?
Solution:
We know that density is equal to the mass divided by volume.
we will convert the unit first because we require the density in g/cm³.
2.06 kg ×1000 g/ 1 kg = 2060 g
2.00 L × 1000 mL / 1L = 2000 mL
d = m/v
d = 2060 g/2000 mL
d = 1.03 g/mL
mL = cm³
d = 1.03 g/cm³
Thus, density of milk is 1.03 g/cm³.
what is the positive ion in aluminum and oxygen
Answer:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
Explanation:
Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion
The relative atomic mass of copper is 63.5. Explain why this value is not a whole number
This answer is not a whole number due to the fact that it is a decimal form.
A whole number would be 635, it would not be 63.5. Therefore this number is not whole.
PLEASE HELP ITS DUE TODAY
Which two statements below
are true? You can only pick two.
A mixture is made of substances that
can be easily physically separated from
each other.
The elements that make up a compound
are chemicaly bonded to each other and
therefore are NOT easily separated from
each other.
Both compounds and mixtures are easily
separated from each other because they
are elements or substances that are
only in physical contact with each other;
they are not chemically connected.
In a compound and a mixture, changing
the ratio of atoms or substances will
chemically change the compound and
mixture.
Answer:
2nd one and last one
Explanation:
im just that smart
why the cat sits on a stove above the stove
Answer:
Explanation:
if you are wondering how you say that, you say "why the cat sits on the stove" but if it's a random question that has no sense to it my answer to you would be the cat needs some love and heat, the stove is the hottest thing it has right now. Give it some love!
I WILL MARK BRAINLYEST!
What are two things that the DDT and ozone story have in common?
there's no answer options I just need sentences please!
Answer:
DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.
Ozone is a naturally occurring molecule. An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.
Explanation:
It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.
Does the size of the rock affect how fast a rock can be weathered?
Answer:
Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. However, if a rock has a large volume as well as a large surface area, it takes longer for the rock to wear down.
Explanation:
Which item is experiencing a phase change?
A. Water boiling in a teakettle
B. Milk spilling from a cup
C. A sandwich being cut in half
D. An egg cooking on the stove
Can any one help me please
Answer:
a
Explanation:
An item which is experiencing a phase change is water boiling in a tea kettle.
What is a phase change?The conversion of matter from one state to another is called as phase change.The process is accompanied by a large amount of energy being evolved or absorbed during the process. It also depends on factors like temperature and pressure.
Each form of matter has it's own characteristic properties like specific heat, melting and boiling points . There are eight thermal processes through which matter undergoes phase change. They are as follows:1) freezing 2) melting 3)vaporization 4)condensation 5)sublimation 6)deposition 7)ionization 8) recombination.
These eight phases exist at different temperatures and pressures.The heat transfer process takes place in three ways which are conduction, convection and radiation.
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