Answer:
the use of paleontology as a scientific tool
Explanation:
Answer: A forensic paleontologist is a scientist who uses their knowledge of fossils and ancient remains to help solve crimes and investigate mysteries. They apply principles from paleontology, the study of ancient life, to analyze evidence found at crime scenes or archaeological sites.
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.
fied the emicicol formula of a compoun containing
2.44% hydrogen, 39.02% sulphur, 58.54% oxygen
How to calculate molarity using solute moles
What is the % of nickel in Ni3(PO4)2?
Answer:
it would be 98 precent ....
Hello I need help with this question
Deleted answer. ......
If you have a 350 gram sample of an isotope with a four-year half-life, how much of the sample would remain after three half-lives? Explain your reasoning.
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
How could the spread of CCD affect the growth of bee larvae?
Exactly 25.0 mL of an aqueous solution of barium hydroxide required 32.0 mL of 0.200 M nitric acid to neutralize it. What is the concentration of the barium hydroxide solution?
Give only your numerical answer and do not include the M. For example, 0.262 or 1.25.
Answer:
[tex] \frac{0.200 \times 320}{57} = .112[/tex]
Hope this helps
The concentration of 25 ml barium hydroxide required to neutralize 32 ml of 0.200 M nitric acid is 0.256 M.
What is neutralization?Neutralization is the reaction of acid with base to form a salt of neutrality. The salt formed is not acidic or basic.
In the given reaction, barium hydroxide is a base and nitric acid is the acid and they forms barium nitrate and water.
If the volume and molarity of a solution is given and the molarity or volume either one of the second solution is given, then the unknown quantity of the second solution can be calculated as follows:
M₁V₁ = M₂V₂
Where, M₁ and V₁ is the molarity and volume respectively of first solution and M₂ and V₂ be that of second solution.
The molarity and volume of nitric acid is 0.200 M and 32.0 ml. Volume of nitric acid is given 25 ml. Thus the molarity of nitric acid is calculated as follows:
Volume of nitric acid = (32 ml × 0.200 M) /25 ml
= 0.256 M
Therefore, the concentration of barium hydroxide required to neutralize 0.200 M nitric acid 0.256 M.
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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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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
What 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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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:
-
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 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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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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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.
Balance the following chemical equations.
A)Cu2O(s) + C(s) —--------> Cu(s) + CO(g)
B)H2(g) + Cl2(g) —---------> HCl(g)
Which is the correct set of products for the acid-base neutralization reaction between hydrochloric acid and sodium hydroxide?
Answer: I think the answer is C. NaCl and H2O
Explanation: I’m not sure tho
Answer:
C) - Water and a Salt
Explanation:
Because Water and a Salt are the products of a neutralization reaction between an acid and a hydroxide base.
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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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.
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.
Kalia spent a quarter of her weekly allowance on a movie. The movie was $4.75. What is her weekly allowance?
Answer:
$17
Explanation:
$4.75 is equal to 0.75 * x value, where x is the weekly allowance
$4.75=0.75x
$17=x
How does the amount of carbon dioxide affect the rate of photosynthesis?
Answer:
An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light-independent reaction, and so the rate of photosynthesis generally increases until limited by another factor.
Explanation:
pls help me who is good at science!!
Answer: photosynthesis , pollination, decomposition
Explanation:
Which element do plants need a lot of in order to go?
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]
Which term describes this reaction?
R1
R2
0.
R2
+
| 121
|
H3N+ -C-C
|
H
H
| |
H-N+-C-C
| |
H H
R10
| |
H3N+ -C-C-N-C-C
| | |
H H H
0-
o
H20
addition
condensation
elimination
O substitution
Answer:Biopolymer: the monomeric amino acids are linked through an
amide bond (the carboxylic acids of one AA with the α-amino
group of a second)
Explanation:
In this reaction, elimination of water molecule takes place, therefore this reaction is elimination reaction. So, option C is correct.
What is elimination reaction ?In a one- or two-step method, two substituents are removed from a molecule in an organic reaction known as an elimination reaction. The E2 reaction is the name given to the one-step mechanism, and the E1 reaction to the two-step mechanism.
Dehydration and oxidation are the two basic techniques used in this kind of process. Dehydrohalogenation. Because it allows us to remove one of the variables and answer a more straightforward equation.
The halogenoalkane and either sodium or potassium hydroxide solution are the same chemicals you use for replacement or elimination.
Thus, option C is correct.
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At the _______ point of a substance, the particles have enough kinetic energy to break free from their fixed positions.
Answer:
At the nucleus point of a substance, the particles have enough kinetic energy to break free from their fixed positions.
Answer : nucleus
A sample of pure acetic acid, CH3COOH, contains 1.40x10^23 carbon atoms. How many moles of acetic acid are in the sample. Explain
Taking into account the definition of Avogadro's number, 0.116 moles of acetic acid are in the sample.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of moles of acetic acid that contains 1.40×10²³ carbon atomsThen you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 1.40×10²³ atoms are contained in how many moles of carbon?
amount of moles of carbon= (1.40×10²³ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of carbon= 0.232 moles
So, the amount of moles of carbon in acetic acid that contains 1.40×10²³ carbon atoms is 0.232 moles.
On the other side, the small subscripts placed to the right of some symbol indicate the number of moles of the element that are found in the compound.
So, in pure acetic acid, CH₃COOH, are present 2 moles of carbon in 1 mole of acetic acid.
Then you can apply the following rule of three: if 2 moles of carbon are present in 1 mole of acetic acid, then 0.232 moles of carbon are contained in how many moles of acetic acid?
[tex]amount of moles of acetic acid=\frac{0.232 moles of carbonx1 mole of acetic acid}{2 moles of carbon}[/tex]
amount of moles of acetic acid= 0.116 moles
In summary, 0.116 moles of acetic acid are in the sample.
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How many moles of oxygen are needed for the complete combustion of 12.6 moles of acetylene?
2C2H2 + 5O2 → 4CO2 + 2H2O
The moles of oxygen required to completely react with 1-mole acetylene is 2.5 mol.
The moles of reactant and product in a chemical reaction to the whole number ratio is given by the stoichiometric coefficient of the balanced chemical equation.
