After one half life initial amounts gets half so :-
First half life :- 350÷2 = 175 grams second half life :- 175 ÷2 = 87.5 grams third half life :- 87.5 ÷2 = 43.75 gramsso at last of third half life amount left = 43.75 grams
each time amount get half
ask ure doubt freely in comments
If 8.6 grams of a certain fertilizer is found to contain 1.2 g of phosphorus is P205 what is the value of P in the N - P - K designation
Based on the mass given, the value of P in the N - P - K designation is 32.
What is percentage mass composition of an element?The percentage mass composition of an element is the mass percent ofbthe element in the the total mass of the compound.
Since the fertilizer contains 1.2 g of phosphorus as P2O5.
Molar mass of P2O5 = 142 g
mass percent of P in P2O5 = 2 × 31/142 = 43.6%
mass of P2O5 in 8.6 g fertilizer = 100/43.6 × 1.2 = 2.75 g
Mass percent of P2O5 = 2.75/8.6 × 100% = 32.0%
Therefore, the value of P in the N - P - K designation is 32.
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pls help me who is good at science!!
Answer: photosynthesis , pollination, decomposition
Explanation:
Explain how the bonding models for sodium metal differ from the bonding model for sodium chloride
Answer:
See below.
Explanation:
Different types of bond models, different interactions of particles in the inner structures.
For sodium metal,
The basic particles, the unit, is metal sodium. So the interaction is originated from metal and metal. We call this interaction, metal, atom-atom interaction.
For sodium chloride,
The basic particles, is 2 different ionic particles, positive particle (sodium, Na+), and negative particle (chloride, Cl-). We call this interaction, ionic-ionic interaction.
So, different interactions, different structures, thus, finally, different binding models.
Which element do plants need a lot of in order to go?
What is the percentage composition of each element in dinitrogen monoxide, N2O? (4 points)
58.32% N; 41.68% O
60.55% N; 39.45% O
63.64% N; 36.36% O
62.66% N; 37.34% O
I think c
Answer:A.) 0
Explanation:
Dinitrogen oxygen ()
Valence electrons of oxygen = 6
Valence electron of nitrogen = 5
The total number of the valence electrons = 2(5) + 6 = 16
The Lewis structure is drawn in such a way that the octet of each atom and duet for the hydrogen in the molecule is complete. So, The Lewis structure is shown in image below.
Formula for formal charge :
Formal charge for oxygen:
Answer:
63.64% N; 36.36% O
Explanation:
percentage composition of each element =
Atomic mass of element ÷ molar mass of compound
Nitrogen Atomic mass = 14u
N2 = 28u
molar mass of N20 = 44
28/44 = .6364 = 63.64%
Oxygen Atomic mass = 16u
0 = 16u
molar mass of N20 = 44
16/44 = .3636 = 36.36%
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79. Explain why the production of a gas does
not always mean that a chemical reaction has
occurred.
How does maximum boiling azeotropic mixture is separated using fractional distillation?
Answer:
By heating the mixture to maximum boiling point and then the solution is distilled at a constant temperature without having a change in composition.
Explanation:
An azeotropic mixture is also called a constant boiling mixture and it is a mixture of two or more liquids whose proportions cannot be altered by simple distillation due to the fact that when an azeotropic mixture is boiled, the vapor has the same proportions of constituents as the unboiled mixture.
Now, maximum boiling azeotropic mixture are the solutions with negative deviations that have an intermediate composition for which the vapor pressure of the solution is minimum and as a result, the boiling point is maximum. At that point, the solution will distill at a constant temperature without having a change in composition.
a
24. Noah is falling off a cliff. At the beginning of his fall, his velocity is 0 meters per second.
After 10 seconds, his velocity is 98 meters per second. What was Noah's acceleration?
Answer:
[tex]9.8ms^{-2}[/tex]
Explanation:
using the equation :
[tex]acceleration = \frac{final velocity - initial velocity}{timetaken} \\ a =\frac{v-u}{t}[/tex]
where v is 98m/s
u is 0m/s
t is 10seconds
[tex]a=\frac{98m/s- 0m/s}{10} \\a=\frac{98}{10}\\ a=9.8m/s^{2}[/tex]
The particle diagram shown above represents the dissolution of CuCl(s) assuming an equilibrium concentration for Cu+ ions of about 4×10^-4M in a saturated solution at 25°C. The equilibrium being represented is shown in the following chemical equation.
CuCl(s)⇄Cu+(aq)+Cl−(aq)
Which of the following changes to the particle diagram will best represent the effect of adding 1.0mL of 4MNaCl to the solution?
A. Some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.
B. Some of the Cu+ and Cl− ions combine to form CuCl(s) because the molar solubility will be lower than 4×10−4M.
C. More Cu+ and Cl− ions will be in solution because the molar solubility will be higher than 4×10−4M.
D. More Cu+ and Cl− ions will be in solution because the Ksp will be higher than 1.6×10−7.
Due to common ion effect, addition of 1.0mL of 4MNaCl will cause some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.
What is solubility product?The term solubility product refers to the equilibrium constant that is set up when an ionic substance dissolve in water. Since the solution already contains chloride ions, addition of more chloride ions from NaCl will cause more CuCl(s) to separate from solution.
Hence, when 1.0mL of 4MNaCl is added to the solution, some of the Cu+ and Cl− ions combine to form CuCl(s) because the Ksp will be lower than 1.6×10−7.
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if you needed a buffer that was 2 ph units away from the pka of your assigned buffer, how would you go about making this buffer
In order to make a buffer that was 2 pH away from the pka, what you have to do is to dilute the buffer.
How to dilute the buffer.If the buffer was made using a base and an acid, then there can be an adjustment through the use of hydrochloric acid.
It can also be adjusted to the value that you want through the use of base such as sodium hydroxide
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Based on what you know about matter explain why the food coloring mixes at different rates
Answer:
Matter has different densities. Different food colorings have different densities. Those with a higher density will sink to the bottom and mix much easier than one with a lower density. The higher density also contains more particles making it easier to mix or give it a fuller color.
How does an atom become a positively charged lon?
A. by gaining one or more electrons
B. by gaining one or more neutrons
C. by losing one or more electrons
D. by losing one or more neutrons
Answer:
your answer would be C
Explanation:
atoms that picks up the extra electron becomes a negatively charged ion (anion)
if we reverse that,
it would be a positively charged ion due to losing an electron
Calculate the mass of an electron traveling at 2.95×10^8 ms if its wavelength is 1.30×10^−12 m. Use 6.626×10^−34kg m2s for Planck's constant.
Your answer should include three significant figures.
With the use of De Broglie equation, the mass of the electron is 1.73 x [tex]10^{-30}[/tex] kg
De Broglie EquationDe Broglie deals with wave - particle duality of some matter. He believe that particle can also exhibit wave properties.
According to De Broglie equation,
λ = h/p
Where
λ = wavelengthh = Planck's constantp = momentumGiven that an electron of wavelength 1.30×10^−12 m is traveling at 2.95×10^8 m/s . Use 6.626×10^−34kg m2s for Planck's constant.
The parameters are
λ = wavelength = 1.3 x [tex]10^{-12}[/tex] mh = Planck's constant = 6.626 x [tex]10^{-34}[/tex] v = velocity = 2.95 x [tex]10^{8}[/tex] m/sm = mass = ?To calculate the mass of the electron, we will make use of de Broglie equation.
λ = h / mv
Make mass m the subject of the formula
mvλ = h
m = h/λv
Substitute all the parameters
m = 6.626 x [tex]10^{-34}[/tex] / (1.3 x [tex]10^{-12}[/tex])(2.95 x [tex]10^{8}[/tex])
m = 1.73 x [tex]10^{-30}[/tex] kg
Therefore, the mass of the electron is 1.73 x [tex]10^{-30}[/tex] kg
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Balance the following chemical equations.
A)Cu2O(s) + C(s) —--------> Cu(s) + CO(g)
B)H2(g) + Cl2(g) —---------> HCl(g)
How to calculate molarity using solute moles
how many atoms are in the glucose chemical formula C6, H12, O6 ?
Answer:
6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms
A compound contain 31.9% potassium
(K) 23.93% cl and the rest oxygen
what is the chemical formula of the
compound
K=39
cl=35.5
O =16
Answer:
kclo2
Explanation:
the percentage can't be written on the equation
You need to make up 500.0 ml of .5750 m glucose (180.15g/mol). What is the mass of the glucose should you measure out
Answer:
Calculate the volume (in mL) of the 1.356 M stock NaOH solution needed to prepare 250.0 mL ... Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar ... g of glucose in enough water to make 500.0 mL of solution. • Step 2: Transfer 18.6 mL of glucose
As per molar concentration, 51.79 g of glucose is required to make 500 ml of 0.5750 M glucose solution.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
In the given problem, mass of glucose is calculated from molar concentration as , molar concentration×molar mass×volume in liters
On substitution, mass= 0.5750×180.156×0.5=51.79 g
Hence, 51.79 g of glucose is required to prepare 500 ml of 0.5750 M glucose solution.
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What is the % of nickel in Ni3(PO4)2?
Answer:
it would be 98 precent ....
1. How many grams of sulfur dioxide could be formed when 299 grams of H2SO4 reacts?
____Cu + ____H2SO4 --> ____CuSO4 + ____SO2 + ____H2O
a 97.6 g
b 195 g
c 391 g
d 48.8 g
Answer:
cu+97.6g+48.8g
prabin Shrestha pyfhfugyyyWhat type of packaging is used for milk? (represent
and compare in a table)
- How do the physical and chemical properties of each
packaging type help create new and better product?
(Material, reactivity with milk, oxygen etc.., shape,
hardness, color)
-What is the relationship between reactivity of material
type chosen and element position in the periodic table.
-Discuss the importance of packaging on human health
-Explain - Aluminum is a highly reactive metal, why is it
used for making cooking utensils?
Please answer this question ASAP
Aluminium can't react with any other substance due to not present in reactive form.
What types of packages used for milk?Milk is packaged in a glass bottles, plastic coated paper board, blow mold nonreturnable polyethylene (PE) containers, plastic pouches, and returnable polycarbonate containers etc.
Aluminum is a highly reactive metal but it is used for making cooking utensils because it can't react with any other substance due to gaining of stability.
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Teeth and long bones are good indicators of age in children; ribs and joints are better for adults.
1. True
2. False
The answer is True not False
Hello I need help with this question
Deleted answer. ......
what can u say about the sizes of all the atoms in a piece of carbon
Answer:
all atoms must have 6 protons to be a carbon atom
Explanation:
brainliest?
-
C3H8 + _ 02 → _CO2 +_H2O
How many moles of O2 needed to make 3.3 moles CO2?
Answer:
1.1C3H8 + 5.5O2 --> 3.3CO2 + 4.4H2O
Explanation:
You insert the 3.3 next to CO2. The easiest now is to calculate the carbon on the reactant side.
You already have 3 carbon but need 3.3 so if you calculate 3.3/3=1.1
Carbons are now equal on both sides.
Now look at hydrogen. At the reactant side, you have 1.1*8= 8.8 of H.
You need to make equal on product side. do 8.8/2 =4.4 so you put the 4.4 in front of h2o.
last bit is oxygen. on the product side you have (3.3*2) +(4.4*1) = 11 oxygen.
You just need to make that equal on the reactant side now. you already have 2 oxygen so you times it by 5.5.
voila. hope you follow.
what is sewageband dirty amd water
Answer:
Sewage is a liquid containing wastes from households, industrial and agricultural activities discharged into water and it is dirty water.
WILL GIVE FREE BRAINLIEST EVERYDAY! DO NOT look up answers!! PLEASE FOLLOW DIRECTIONS ON THIS & FUTURE QUESTIONS OR WRONG!!! Question: What is a lewis Dot model, what is its purpose. And what are some REAL LIFE scenarios it is used in. also give me a description of where the creator is from and their name
(this all the points i have rnn pl.z help a buddy out)
Answer:
What is a Lewis Dot Model?
A simplified representation of the valence shell electrons in a molecule.
What is its purpose?
To show how the electrons are arranged around individual atoms in a molecule.
What are real life examples?
The Lewis Structures helps us understand the bonding of atoms and the shapes of molecules and their chemical properties. And in real life the proteins we eat in food are the carbohydrates which is from chemical bonding, which we can learn through TLS.
Creator of Lewis Structure Facts-
Gilbert Lewis Newton and he is from Weymouth, Massachusetts
Explanation:
Hope this helps you.
Answer:
oh I can give you some points I have but I don't know how to can ya help?
fied the emicicol formula of a compoun containing
2.44% hydrogen, 39.02% sulphur, 58.54% oxygen
please help! i will mark as brainliest
The amount of available energy decreases with each step up the energy pyramid. How is this related to the fact that there are so many more producers than consumers on Earth? explain
Answer:
Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy.
Explanation:
Name the enzymes and coenzymes that catalyze the process of catecholamines inactivation. Explain their mechanism of action.
Answer:
Coenzyme Definition
A coenzyme is an organic non-protein compound that binds with an enzyme to catalyze a reaction. Coenzymes are often broadly called cofactors, but they are chemically different. A coenzyme cannot function alone but can be reused several times when paired with an enzyme.
Functions of Coenzymes
An enzyme without a coenzyme is called an apoenzyme. Without coenzymes or cofactors, enzymes cannot catalyze reactions effectively. The enzyme may not function at all. If reactions cannot occur at the normal catalyzed rate, then an organism will have difficulty sustaining life.
When an enzyme gains a coenzyme, it then becomes a holoenzyme or active enzyme. Active enzymes change substrates into the products an organism needs to carry out essential functions, whether chemical or physiological. Coenzymes, like enzymes, can be reused and recycled without changing reaction rates or effectiveness. They attach to a portion of the active site on an enzyme, which enables the catalyzed reaction to occur. When an enzyme is denatured by extreme temperature or pH, the coenzyme can no longer attach to the active site.
Types of Enzymes
Cofactors are molecules that attach to an enzyme during chemical reactions. In general, all compounds that help enzymes are called cofactors. However, cofactors can be broken down into three subgroups based on chemical makeup and function:
Coenzymes
These are reusable non-protein molecules that contain carbon (organic). They bind loosely to an enzyme at the active site to help catalyze reactions. Most are vitamins, vitamin derivatives, or form from nucleotides.
