Plz help! Will give Brainliest! Protons, neutrons,electrons determine the properties of an atom. A)Describe the mass, charge and location and electrons in a atom. B)What is the role of each of these particles in an atom.

Answers

Answer 1

Protons and neutrons are held together rather closely in the center of the atom. Together they make up the nucleus, which accounts for nearly all of the mass of the atom.

Electrons move rapidly around the nucleus and constitute almost the entire volume of the atom. Although quantum mechanics are necessary to explain the motion of an electron about the nucleus, we can say that the distribution of electrons about an atom is such that the atom has a spherical shape.


Related Questions

What element has a molar mass of 30.974 g/mol

Answers

X4O10Let molar mass of X be ymolar mass =  4y + 10 x 16 = 4y+160
so, moles = 85.2 / (4y+160)
Moles of oxygen = 10 x [85.2 / (4y+160) ]Mass of oxygen  = 16 x 10 x [85.2 / (4y+160) ]which is 48.0
so, 48 = 16 x 10 x [85.2 / (4y+160) ]
Solve the equation to get y.
y = 31
Final answer:

The element with a molar mass of 30.974 g/mol is phosphorus. Molar mass corresponds to the mass of one mole of a substance, which contains Avogadro's number of particles.

Explanation:

The element with a molar mass of 30.974 g/mol is phosphorus (P). The concept of molar mass is significant in chemistry, as it relates the mass of the substance to the number of molecules or atoms. One mole of a substance corresponds to 6.022 × 10²³ particles (Avogadro's number), whether they're molecules, formula units, or atoms. The molar mass in grams per mole (g/mol) is numerically equal to the average atomic mass of the element.

In this case, a quick examination of the periodic table will reveal that phosphorus has an atomic mass very close to 30.974 amu, which corresponds to its molar mass in grams. Hence, 1 mole of phosphorus atoms has a mass of 30.974 g and contains 6.022 × 10²³ atoms of phosphorus.

Sedimentary rocks are the only rocks that can potentially contain ___________(fossils/minerals).

Answers

fossils because minerals can be found in anything

Answer:

fossils

Explanation:

edge

Which of the following pairs of atoms do NOT exhibit an ionic bond?

N and H

Li and Br

O and Mg

F and Cu

Answers

N and H are both gases and would not form an ionic bond.

Answer:

F and Cu.

Explanation:

Hello,

In this case, by knowing that the farther the elements in the periodic table, the more ionic they are, in addition to the difference in the electronegativity which must be greater than 1.7 for the bond to be ionic, we can substantiate that the iron and the copper don't exhibit an ionic bond as shown below:

[tex]\Delta E=E_{Cu}-E_{Fe}=1.9-1.83=0.07[/tex]

Such value is characteristic for covalent bonds.

Best regards.

The Following questions pertain to a 2.2M solution of hydrocyanic acid at 25°C. pKa = 9.21 at 25°C. Find the concentrations of all species present in the solution at equilibrium. Find the pH of the solution. Identify the strongest base in this system.

Answers

1) Chemical reaction: HCN + H₂O → CN⁻ + H₃O⁺.
c(HCN) = 2,2 M = 2,2 mol/L.
pKa(HCN) = 9,21.
Ka = 6,16·10⁻¹⁰.
[CN⁻] = [H₃O⁺] = x.
[HCN] = 2,2 M - x.
Ka = [CN⁻] · [H₃O⁺] / [HCN].
6,16·10⁻¹⁰ = x² / 2,2 M -x.
Solve quadratic equation: [CN⁻] = [H₃O⁺] = 0,0000346 M.
[HCN] = 2,2 M - 0,0000346 M = 2,199 M.

2) pH = - log[H₃O⁺].
pH = -log( 0,0000346 M).
pH = 4,46.
Hydrocyanic acid and hydronium ion (H₃O⁺) are acids. Cyanide anion (CN⁻) is the strongest base in the system, cyanide anion accept protons in chemical reaction.
pKb = pKw - pKa.
pKb = 14 - 9,21 = 4,79.

The strongest base in the system is the cyanide ion.

The following steps must be followed here;

Write the equationSet up the tableMake relevant calculations from the table

The calculation of the pH of the solution, the strongest base in the system are shown in the file attached. The pH is the negative logarithm of the hydrogen ion concentration of the solution as shown.

Hence, the strongest base in the system is the cyanide ion.

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find the density of an object that has a mass of 66g and a 10 cm3. HELP ASAP

Answers

Density = mass /volume

Density = 66g/10cm³

Density = 6.6g/cm³....

Just take note of the formula....

Hope this helped....

Answer: [tex]6.6\ g/cm^3[/tex]

Explanation:

The formula to calculate the density is given by :-

[tex]\text{Density}=\dfrac{\text{Mass}}{\text{Volume}}[/tex]

We are given that the volume of an object is [tex]10\ cm^3[/tex]

Mass of object  = 66g

Now, the density of object is given by :-

[tex]\text{Density}=\dfrac{66}{10}\\\\\Rightarrow\ \text{Density}=6.6\ g/cm^3[/tex]

Hence, the density  of object = [tex]6.6\ g/cm^3[/tex]

Consider two solutions: solution x has a ph of 4; solution y has a ph of 7. from this information, we can reasonably conclude that _____. consider two solutions: solution x has a ph of 4; solution y has a ph of 7. from this information, we can reasonably conclude that _____. the concentration of hydrogen ions in solution y is 1000 times as great as the concentration of hydrogen ions in solution x the concentration of hydrogen ions in solution x is 1000 times as great as the concentration of hydrogen ions in solution y solution y has no free hydrogen ions (h+) the concentration of hydrogen ions in solution x is 3 times as great as the concentration of hydrogen ions in solution y

Answers

The concentration of hydrogen ions in solution x is 3 times as great as the concentration of hydrogen ions in solution y if solution x has a ph of 4; solution y has a ph of 7.

In a solution , the pH  is a measure of the hydrogen ions  in the solution . The lower the pH, the higher the amount of hydrogen ions.  The number of hydroxide ions  in the solution decreases as the number of hydrogen ions increases. X is 1,000 times as acidic as  Y. Because  each step in the pH scale represents a change in concentration by a factor of 10. Since Y has a pH of 7 .0, and X has a pH of 4 .0, the concentration would change by 100 times 10. That is 7-4=3. And thus Thrice the factor '10' gives 10×10×10=1000.

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Final answer:

The concentration of hydrogen ions in Solution X with a pH of 4 is 1000 times as great as the concentration in Solution Y with a pH of 7, due to the logarithmic nature of the pH scale.

Explanation:

Given that Solution X has a pH of 4 and Solution Y has a pH of 7, it's important to understand that the pH scale is logarithmic, meaning each whole number change represents a tenfold change in hydrogen ion (H+) concentration. Therefore, the concentration of hydrogen ions in Solution X is not 3 times, but 1000 times as great as the concentration of hydrogen ions in Solution Y. Since the pH scale shows that a lower pH means a higher concentration of H+ ions, a pH of 7 is neutral, a pH below 7 is acidic, and above 7 is basic. For every unit decrease in pH, the concentration of hydrogen ions increases by a factor of 10. Thus, a solution of pH 4 has 10³ (or 1000) times more H+ ions than a solution with a pH of 7.

At what temperature is more KCl able to dissolve: 40°C or 90°C?


(You don't have to give out a paragraph, but also explain why, so that I may understand)

Answers

I believe it would be 90° c, This is because solubility increases with increase in temperature, and therefore more solute would dissolve at a higher temperature. Hence, more KCl will dissolve at a temperature of 90°C as compared to a temperature of 40° C.

PLEASE HELP ME!

Explain why, no matter how much we dilute an acid with water, the pH never rises above 7.

Answers

The pH scale is used to measure the degree of acidity or alkalinity of a solution. The scale runs from 0 (very acidic solutions can have a negative pH) to 14 (very alkaline solutions can have a pH higher than this), while a neutral liquid such as pure water has a pH of 7. The pH is linked to the concentration of hydrogen ions (H +) in the solution. Diluting an acid or alkali affects the concentration of H + ions in a solution and therefore affects the pH. In this activity, we will investigate how diluting an acid or alkali affects the pH.
Hope this helps:D
Have a great rest of a brainly day!

As water has a neutral pH of 7, diluting an acid water does not raise it's pH above 7.

What is an acid?

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.


Which arrow represents the change of state described above?

L
M
N
O

Answers

The correct answer is L, solid to gas; given that you meant after the change the substance can fill the container entirely

Answer is: L.

The process by which a solid changes directly to a gas without first becoming a liquid is called sublimation.

Sublimation is an endothermic process.

For example dry ice (carbon(IV) oxide in solid state) is used because of sublimation in nightclubs, fog machines, at theaters, haunted house attractions .

1) Gas: does not have a definite shape or volume and changes to liquid on cooling.

2) Liquid: has definite volume but not shape and changes to solid on cooling.

3) Solid: has definite shape and volume and changes to liquid on heating.


a student reports three trials to measure the density of an unknown metal. The percent error in these trails is given in the table

Answers

Hi!

Let me complete the question for you. 

Trial Count  Percent Error

    Trial 1               0,05

    Trial 2              0,02

    Trial 3               0,01

The most accurate value is the one From Trial 3

Percent Error 
is a measure of the difference between the experimental value and a theoretical one. The equation for calculating the percent error is shown below:

[tex]Percent Error=\frac{|Experimental Value-Theoretical Value|}{|Theoretical Value|}*100 [/tex]

Results are more accurate as the Percent Error is lower, so as Trial 3 has the lowest percentage error, the result of it would be the most accurate.

Have a nice day!

What property of half-lives makes radioactive material so problematic?check all that apply?

Answers

I believe the best answer is both A and B, that is there is no known way to shorten a half life, radioactivity is limited by the natural decay-time to stable isotopes, and again all half-lives are long, there is no known way to measure half-lives are long, there is no known way to measure half-lives with any accuracy. Half life is the time taken by a radioactive material to undergo decay to reach half of its original mass. 

What is the molar mass of gas that has a density of 1.97 g/L at STP?

Answers

Final answer:

The molar mass of a gas can be calculated using the ideal gas law equation at STP. The molar mass of the gas with a density of 1.97 g/L at STP is 44.1 g/mol.

Explanation:

The molar mass of a gas can be calculated using the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. At STP (Standard Temperature and Pressure), the pressure is 1 atm and the temperature is 273 K. We can rearrange the equation to solve for the molar mass, M:

M = (PV) / (nRT)

Given that the density of the gas is 1.97 g/L at STP, we can calculate its molar mass by converting the density to grams per mole:

Density = Molar mass / Molar volume

Molar volume at STP = 22.4 L/mol

Thus, Molar mass = Density * Molar volume

Molar mass = 1.97 g/L * 22.4 L/mol = 44.1 g/mol

The molar mass of the gas is 44.1 g/mol.

A solution has a density of 1.22 g/ml. what volume of the solution has a mass of 48.2 g?

Answers

density = mass / volume

1.22 = 48.2 / volume

volume = 48.2/1.22

volume = 39.508 ml

What products result when carbonic acid reacts with potassium feldspar?

Answers

I believe that Carbonic acid is a very weak acid formed by the solution of carbon dioxide in water. The common cations of feldspar (K+, Na+, and Ca+2, are fairy soluble in acidic solutions, therefore a reaction of Carbonic acid with potassium feldspar causes the feldspar to chemically decompose. Potassium , sodium and calcium are then released to the soil and precipitated as minerals.

One symptom of carbon monoxide poisoning is the development of Mees lines on the fingernails and toenails.

true or false

Answers

Mees' lines are white bands that form across your fingernails and are one of the symptoms of carbon monoxide poisoning.

Mees' lines are a sign that the growth of your nails temporarily stopped at one point. There are many causes to Mees' lines, and usually it indicates a toxicity. Carbon monoxide, along with other substances like arsenic, and selenium poisoning may cause them. 


Answer:

False is your answer

"what type of covalent bond between amino acid side chains (r groups) functions in maintaining a polypeptide's specific three-dimensional shape?"

Answers

I believe it is the disulfide bond. A bond is a force of attraction between atoms. In proteins and polypeptides the disulfide bonds are formed between the thiol groups of two cysteine amino acids. Cross linkage between multiple linear polypeptide chains is not uncommon in proteins. Most of the cross linkages are from disulfide bonds formed by the oxidation of two cysteine amino acids. 

The covalent bond that plays a role in maintaining a polypeptide's tertiary structure is the disulfide linkage, formed between cysteine side chains. This bond is essential in stabilizing the three-dimensional shape of the protein, which is crucial for its functionality.

Tertiary Structure of Proteins

The type of covalent bond between amino acid side chains (R groups) that functions in maintaining a polypeptide's specific three-dimensional shape is a disulfide linkage. This bond is the result of interactions between two cysteine amino acids, which contain sulfur in their side chains. When these cysteine side chains come into proximity in the folded protein and the conditions are oxidative, a covalent disulfide bond can form between them. This is a crucial aspect of the tertiary structure of a protein and helps stabilize its three-dimensional conformation. Other interactions, including ionic bonds, hydrophobic interactions, and van der Waals forces, while not covalent, also play significant roles in the protein folding process and the final structure.

It's important to note that the tertiary structure of a protein is critical for its function. If the structure is altered, for instance by denaturation, the protein may lose its functionality. Ultimately, the specific arrangement of amino acids and the interactions among R groups define the unique shape and function of a protein.

1. Which molecule is a dipole?
A. Methane
B. Nitrogen Gas
C. Carbon tetrachloride
D. Nitrogen dioxide

2. Which statement is true regarding a hydrogen bond?
A. It is weaker than dipole interaction forces
B. It is weaker than London dispersion forces
C. It is strong because of the lack of inner electrons shells in a hydrogen atom
D. It is stronger than an ionic bond

Answers

1=c
2=a
human friend:)
Final answer:

Nitrogen dioxide is a dipole due to its unshared pair of electrons and bent shape. Hydrogen bonds, while stronger than London Dispersion forces, are weaker than dipole interaction forces, not due to a lack of inner electron shells in hydrogen, but due to its small size and high electronegativity when attached to certain atoms.

Explanation:

The molecule that is a dipole is Nitrogen dioxide (NO2). A dipole is formed when the electron distribution between the atoms in a molecule is uneven, resulting in a molecule with a net electric dipole moment. Nitrogen dioxide has an unshared pair of electrons and the molecule is bent, leading to a resulting dipole moment, unlike Methane, Nitrogen gas, and Carbon tetrachloride which are symmetric and have no net dipole moment.

Regarding hydrogen bonding, the true statement is A. It is weaker than dipole interaction forces. Hydrogen bonds are primarily electrostatic forces of attraction, which are weaker than ionic bonds. However, they are stronger than London Dispersion forces. The strong hydrogen bond is not due to a lack of inner electron shells in a hydrogen atom, but to the small size and high electronegativity of hydrogen attached to small and highly electronegative atoms like Nitrogen, Oxygen, and Fluorine.

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4. Which of the following is an accurate description of the relationship demonstrated in Ohm's Law? A. The electric potential (volts) multiplied by the resistance (ohms) equals the current (amperes). B. The electric potential (amperes) divided by the resistance (ohms) equals the current (volts). C. The electric potential (volts) divided by the current (amperes) equals the resistance (ohms). D. The resistance (ohms) divided by the current (amperes) equals the electric potential (volts).

Answers

C. The electric potential (volts) divided by the current (amperes) equals the resistance (ohms)

The correct answer is option C, that is, the electric potential (volts) divided by the current (amperes) equals the resistance (ohms).  

According to the Ohm's law, the current via a conductor between the two points is directly equivalent to the voltage through the two points. With the introduction of resistance, that is, the constant of proportionality, the mathematical equation, which describes the association is:  

I = V/R

Here, I is the current via the conductor in the units of amperes, R is the resistance of the conductor in the units of ohms, and V is the voltage determined across the conductor in the units of volts.  


Which of these resources are renewable? Check all that apply.

Answers

wind, forests, and tides are all correct i got checks for all on the assignment

An element that has been broken down and released particles and energy is said to be ____.

Answers

It is said to be radioactive. Hope this was helpful because I'm learning this in school and I think it's right.

The element that has been broken down and released particles and energy is said to be radioactive in nature. The radioactive isotopes undergo nuclear fission to produce lighter isotopes and evolve energy.

What is nuclear fission ?

Heavy unstable radioactive isotopes undergo nuclear decay to by the emission of charged particles alpha or beta and form lighter elements with more half life with the evolution of energy.

This break down  of an atomic nuclei  into lighter elements with the releases of massive energy is called nuclear fission. Almost all elements have two or more isotopes. But not all of them are stable and some are radioactive.

This radioactive elements are undergoing nuclear fission by the emission of alpha or beta particles. For example, uranium, plutonium, carbon -14 etc are radioactive elements.

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Tommy was walking at a rate of 4
miles
hour
at noon and at 12:30 pm he was walking at a brisk rate of 6
miles
hour
. Two hours later Tommy was walking at a leisurely rate of 2
miles
hour
. Which statement about Tommy's accleration is true?
A) Tommy had an accleration of zero the entire time.
B) Tommy had a positive acceleration between noon and 12:30 pm.
C) Tommy had a positive acceleration between 12:30 and 2:30 pm.
D) Tommy had a negative acceleration between noon and 12:30 pm.

Answers

A positive acceleration indicates that the object sped up. This means that if you compare the first speed to the second, the second speed should be higher. 

A negative acceleration indicates that the object has slowed down. This means that if you compare the first speed to the second, the second speed should be lower.

If an acceleration is 0, it means that it neither slowed down nor sped up.

Now let us analyze your problem by listing down the speed and the time:

At noon: 4 mi/hr 
12:30 :   6 mi/hr
2:30   :   2 mi/hr

From noon to 12:30, you will notice that there is an increase in speed. This means that Tommy had a positive acceleration. (Rules out D.)

From 12:30 to 2:30, there is a decrease in speed. This would indicate that Tommy had a negative acceleration. (Rules out C.) 

No speed was the same, so acceleration was never 0. (Rules out A.)

From the assumptions above, we can now deduce that the answer is B.


What is the most important chemical property of amines?

Answers

Answer:

The most important chemical property of amines is that they are weak bases.

Explanation:

The general form of amines is R-NH2. they have atoms of nitrogen bonded to  atoms of carbon and two, one or none atoms of hydrogen.

The atom of nitrogen has a lone pair of electrons. The lone pair of electrons makes that the chemical behavior of amines is similar to ammonia (NH3) and  explains their basic nature.


Final answer:

The key chemical property of amines is their basicity, related to the unshared electron pair on the nitrogen atom. Amines are protonated to form ammonium cations and react similarly to ammonia. Amines vary in their physical properties based on the degree of nitrogen substitution.

Explanation:

The most important chemical property of amines is their basic nature. Amines are readily protonated to form ammonium cations, which is a direct consequence of the presence of an unshared electron pair on the nitrogen atom, making them Lewis bases. In their role as bases, amines can accept protons (H+), and thus, when an amine reacts with an acid, an ammonium salt is typically formed. It's also worth noting that the basic strength of amines makes them react similarly to ammonia since both have a lone pair on the nitrogen atom that facilitates this basic nature.

Amines are categorized as primary, secondary, and tertiary, depending on the number of hydrocarbon groups bonded to the nitrogen atom. In the case of a quaternary ammonium ion, the nitrogen has four bonds to carbon, which is rarer in biomolecules. Lastly, the physical properties of amines, such as volatility and solubility, are influenced by the extent of substitution on the nitrogen atom.

what are the spaced-out sections of this wave called?
reflections
compressions
wavelength
rarefactions

Answers

The answer is wavelengths or C
It is called WAVELENGTH i think

How many molecules of SO2 are in 2.45 g of SO2? (molar mass=64.06 g/mol). (Hint: you need to use your entire stoichiometry flow chart!)

0.0382 molecules

9.45 x10^25 molecules

2.30 x 10^22 molecules

6.35 x 10^-26 molecules

Answers

9.45 x10^25 molecules

Fresh water in frozen glaciers and ice caps makes up what percentage of the total amount of fresh water on Earth? exactly 33% between 3% and 97% more than 97% about 66%

Answers

Fresh water in frozen glaciers and ice caps makes up about 66% of the total amount of fresh water on Earth.
3% of Earth's water is fresh water and 97% of Earth's water that is salt water.
Fresh water in frozen glaciers and ice caps makes up 2% of all water on Earth and 1% of Earth's water is usable in liquid form.
2% ÷ 3% = 0,66. 

about 60 % (is correct on grad point)

Please help with 2 chem questions thank you!

Answers

The correct answers are A and C.
The 1st one is A

The second one is I am 90% sure is A as well

The small intestine receives food from the _____.

rectum
stomach
large intestine
liver

Answers

Is the stomach because your Large intestine plays a role after the small intestine.

Answer: stomach

Explanation:

What mass of NaOH is in 3.0e+02 mL of a 5.0 M NaOH solution?

Answers

Answer is: mass of sodium hydroxide is 60 grams.
V(NaOH) = 300 mL · 1 L/1000mL = 0,3 L.
c(NaOH) = 5 M = 5 mol/L.
n(NaOH) = c(NaOH) · V(NaOH).
n(NaOH) = 5 mol/L · 0,3 L.
n(NaOH) = 1,5 mol.
m(NaOH) = n(NaOH) · M(NaOH).
m(NaOH) = 1,5 mol · 40 g/mol.
m(NaOH) = 60 g.

The volcanoes (red dots) in this map are MOST LIKELY caused by A) folding. B) subduction. C) metamorphism. D) seafloor spreading.

Answers

b subdutuction  none of the rest cause volcanoes

Answer:

b

Explanation:

b. subsection is the correct answer.

hopes this helps

If a particular ore contains 58.9 % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus?

Answers

1 mole of phosphorous contains 31 g/ mol
Thus, 1000 g will contain 1000/31 moles
The RFM of calcium phosphate (Ca₃(PO₄)₂ = 310 G
1 Mole of calcium phosphate contains 2 moles of P
Therefore, the number of moles of Calcium phosphate that will contain 1000/31 moles will be;
 (1/2)× (1000/31) = 1000/62 moles
but 1 mole of calcium phosphate = 310 g
thus, (1000/62) moles calcium phosphate will contain;
= (1000/62)× 310
= 5000 g or 5 kg
Therefore, for 5 kg of calcium phosphate to be processed we will need
 (5000 /58.9)×100 
= 8488.96 g or 8.489 kg of the ore
Thus, a minimum of 8.489 kg of the ore must be processed to yield 1 kg of phosphorus



Final answer:

approximately 8.51 kg of the ore must be processed

Explanation:

To calculate the minimum mass of ore required to obtain 1.00 kg of phosphorus from an ore containing 58.9% calcium phosphate (Ca3(PO4)2), we follow these steps:

First, calculate the molar mass of calcium phosphate, Ca3(PO4)2. The molar mass is (3×40.08 for Ca) + (2×30.97 for P) + (8×16 for O) = 310.18 g/mol.

Next, understand that calcium phosphate contains two moles of phosphorus per formula unit, which means every mole of calcium phosphate yields 2 moles of phosphorus.

To get 1.00 kg (or 1000 g) of phosphorus, we need 1000 g / 30.97 g/mol = 32.29 moles of phosphorus.

Since 1 mole of Ca3(PO4)2 yields 2 moles of phosphorus, we need 32.29 / 2 = 16.145 moles of calcium phosphate.

To find the mass of calcium phosphate required, multiply the moles by its molar mass: 16.145 mol × 310.18 g/mol = 5006.05 g.

Given that the ore is 58.9% calcium phosphate, the total mass of the ore needed is calculated as 5006.05 g / 0.589 = 8505.18 g, or approximately 8.51 kg.

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