C14 is another radioactive substance with a half-life of 5730 years. If a mammoth died with
2000 grams of C14 and then its fossilized bones were found to have just over 250 grams of
C14, how old is the fossil?
a) 5730 years
c) 17,190 years
d) impossible to tell
b) 11,460 years

Answers

Answer 1
B. 5730 years !!!!!!!!!!!!!!

Related Questions

HURRY!!!!!! HELP PLEASEEE

To begin the experiment, 1.65g of methane CH4 is burned in a bomb calorimeter containing 1000 grams of water. The initial temperature of water is 18.98oC. The specific heat of water is 4.184 J/g oC. The heat capacity of the calorimeter is 615 J/ oC . After the reaction the final temperature of the water is 36.38oC.

2. Calculate the change in temperature, ΔT. Show your work. (1pt)

3. Calculate the heat absorbed by water. Use the formula qwater = m • C • ΔT
Show your work (2pts)

4.Calculate the heat absorbed by the Calorimeter. Use the formula:
qcal = Ccal • ΔT Show your work. (2pts)


5. The total heat absorbed by the water and the calorimeter can be calculated by adding the heat calculated in steps 3 and 4. The amount of heat released by the reaction is equal to the amount of heat absorbed with the negative sign as this is an exothermic reaction. (2pts)
a.Using the formula ΔH = - (qcal + qwater ) , calculate the total heat of combustion. Show your work.

b. Convert heat of combustion (answer from part a) from joules to kilojoules. Show your work.

6. Evaluate the information contained in this calculation and complete the following sentence: (2pts)

This calculation shows that burning _______ grams of methane [TAKES IN] / [GIVES OFF] energy (Choose one).

7. The molar mass of methane is 16.04 g/mol. Calculate the number of moles of methane burned in the experiment. Show your work. (2pts)

8. What is the experimental molar heat of combustion in KJ/mol? Show your work. (2pts)

9. The accepted value for the heat of combustion of methane is -890 KJ/mol . Explain why the experimental data might differ from the theoretical value in 2-3 complete sentences. (2pts)

10. Given the formula:
% error= |(theoretical value - experimental value)/theoretical value)| x 100
Calculate the percent error. Show your work. (2pts)

Answers

The calorimter is equal to the heat released by the reaction. Calculate the heat released by the reaction.

What is the reaction?

The reaction to the news can vary depending on who you are speaking to. For some, the news may be welcomed as a sign of progress and a move in the right direction. Others may be apprehensive, uncertain of the potential outcomes or changes that may come as a result. Some may be angry and frustrated, feeling as though the news has been a long time coming and they have not been given a say in the matter.

1. ΔT = 36.38oC - 18.98oC = 17.4oC

2. qwater = m • C • ΔT

  qwater = (1000g)(4.184J/g oC)(17.4oC)

  qwater = 71376.8 J

3. qcal = Ccal • ΔT

  qcal = (615J/ oC)(17.4oC)

  qcal = 10666.1 J

4. qreaction = qwater + qcal

  qreaction = 71376.8 J + 10666.1 J

  qreaction = 82042.9 J

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How would I make a biodegradable mask

Answers

Answer:

Explanation:

Go to a craft store and buy so me material that are biodegradable

Sea, sand, sky, palms – made almost all of

Answers

Answer:

sup

Explanation:

Which of these cannot be
a source of centripetal force?
A. mass
B. friction
C. electric force
D. gravity

Answers

Answer:

D. Gravity

Explanation:

Gravity cannot be a source of centripetal force. Gravity is the force of attraction from between all masses in the universe; especially the attraction of the earth’s mass for bodies near its surface; “gravitation cannot be held responsible for people falling in love” with Albert Einstein.

It manner that is serious and solemn. A solemn and dignified feeling.

Therefore, the correct answer is d. gravity.

A. mass

Mass never provides any force. It is what forces act on. Friction acts as a centripetal force on roads when you’re turning in a circle. Gravity acts as a centripetal force for things like satellites and rockets that orbit Earth and other planets. I’m less familiar with electric force, but I’m sure it can work as centripetal force too. Mass is the only option here that isn’t even a force.

1. What is a common example of a converging mirror?
2. Where must you (the object) stand in front of a converging mirror if you want to see an upright,
virtual image of yourself? What is the size of the image compared to the object?
3. A converging mirror produces no image when the object is at
4. If the centre of curvature in a converging mirror is at 10cm, the focal point will be at
om

Answers

1)Concave mirrors are called converging mirrors because as light falls on the mirror, it collects the light and refocuses the parallel incoming rays.

2)The image produced by a convex mirror is always virtual, and located behind the mirror. When the object is far away from the mirror the image is upright and located at the focal point.

3)When the object is located at the focal point, no image is formed. As discussed earlier in Lesson 3, light rays from the same point on the object will reflect off the mirror and neither converge nor diverge.

sorry I don't know 4one

i HOPE IT'S HELP

(No scammers) can someone help me pls

Answers

Answers is - 198 kilo joules

Jose was driving to New York City. He traveled 100 miles in the first hour of the trip and 20 miles in the last hour of his trip. Which can we
say about Jose's drive? (speed = distance = time)
A. Jose drove less than 120 miles.
B. Jose drove faster the first hour of his drive.
C. Jose drove slower the first hour of his drive.
D. Jose drove the same speed for the entire drive.

Answers

Answer:

b

Explanation:

he drove 5x faster than the time was when he was on the last hour (maybe caught in traffic or wasn't in a rush)

Viruses are not considered organisms, because they lack many of the characteristics of living things. A virus is essentially a string of genetic material in
a protein coat. Some viruses contain DNA, while others, called retroviruses, contain RNA. One example of a retrovirus is HIV, which causes AIDS
How is RNA different from DNA? Choose the 2 statements that apply
A. DNA and RNA use different sets of nitrogen bases.
B
DNA has 1 strand of genetic material while RNA has 2 strands
C. DNA contains deoxyribose sugar and RNA contains ribose sugar,
D. DNA and RNA are proteins

Answers

Answer:

well, I think the answer is C

The difference between RNA and DNA are:

A. DNA and RNA use different sets of nitrogen bases.

C. DNA contains deoxyribose sugar and RNA contains ribose sugar.

What are RNA and DNA?

DNA and RNA, both are genetic materials, but DNA is double-stranded and RNA is single-stranded.

DNA is present in all animals and plants, and RNA is present in viruses and bacteria.

Both are made up of nitrogenous bases and sugar.

Thus, the correct options are A and C.

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2. What percentage of the offspring
will have the red flowers?

Answers

Answer:

1/4 of the offspeing will have the red flowers

What is metallurgy?

A. Science of minerals.
B. Science of working with metals.
C. Science of breaking down rock.
D. Science of volcanoes.

Answers

Answer:

B science of working with metals

Bloc ate 1 craft craft had 3 crafts. How much crafts are there?

Answers

If he had 3 and then ate 1 them that would mean that he has 2 crafts left

A 10.150g sample of a compound known to contain phosphorus and oxygen yields 5.717 g of oxygen. Find the empirical formula of the compound

Answers

Answer: The empirical formula is [tex]P_2O_5[/tex]

Explanation:

Mass of O = 5.717 g

Mass of P= (10.150-5.717) g = 4.433 g  

Step 1 : convert given masses into moles.

Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{5.717g}{16g/mole}=0.357moles[/tex]

Moles of P=[tex]\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{4.433g}{31g/mole}=0.143moles[/tex]  

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For O = [tex]\frac{0.357}{0.143}=2.5[/tex]  

For P =[tex]\frac{0.143}{0.143}=1[/tex]

The ratio is to be converted to whole number

Thus whole number ratio of O : P = [tex]2.5\times 2:1\times 2=5: 2[/tex]

Hence the empirical formula is [tex]P_2O_5[/tex]

Which best describes the products of a
chemical equation?
A. Chemicals before the reaction starts
B. Chemicals after the reaction ends
C. Chemicals on the left of the arrow
D. Chemicals on the right of the arrow

Answers

Answer:

b?

Explanation:

Chemicals after the reaction ends during chemical equation. Therefore, the correct option is option B among all the given options.

What is chemical equation?

In chemistry, you will frequently come across a chemical equation. It is a textual depiction of the procedure that takes place throughout a chemical reaction using numbers and symbols.

The reactants are placed on the left side of such an arrow in a chemical equation, while the reaction's products are placed on the right. Though certain equations may imply equilibrium with the reaction occurring in both directions simultaneously, the tip of the arrow normally heads toward the right or product side of the equation. Chemicals after the reaction ends during chemical equation.

Therefore, the correct option is option B.

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What is the mass of 4.57 x 1021 molecules of ammonia (NH3)?

Answers

Answer:

4665.97

Explanation:

How much heat does it take to raise 100g of aluminum (c= .9 J/gC) from 12.5C to 31C?

Answers

Answer:

When two substances having different temperatures are introduced or kept together, heat energy, Q, flows from a substance at higher temperature to a substance at lower temperature. Also, heat continues to be transferred until their temperatures are equalized, at which point the substances are in thermal equilibrium. In a closed system, the amount of energy lost is equal to but opposite the amount of energy gained.

Explanation:

10 If Steve was making a solution of ammonium

chloride, how many grams would he have left

undissolved (if any) if he initially placed 140 g of

the chemical into 200 grams of water at 80 °C.

Answers

Answer:

8.8g of ammonium chloride would be undissolved.

Explanation:

The solubility of ammonium chloride at 80°C is: 65.6g / 100mL

As the solubility is 65.6g / 100mL, in 200g = 200mL the solubility will be:

65.6g * 2 =

131.2g / 200g

That means the water at this temperature will dissolve 131.2g of ammonium chloride. As were placed 140g, the mass that will be undissolved is:

140g - 131.2g =

8.8g of ammonium chloride would be undissolved

A gas has an initial volume of 15 L. If the temperature increases from 330 K to 450 K, what is the new volume.

Answers

Answer:

20.(45)L or about 20.4545L

Explanation:

PV = nRT

Where:

P - pressure

V - volume

n - number of particle moles

R - a constant

T - temperature in K

We can assume the P and n (and definitely R) stay the same, so we infer that

[tex]V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L[/tex]

Which is a property of a covalent compound?

A.being shaped easily

B.good electrical conductivity

C.low melting point

Answers

Answer:

c: low melting point

Explanation:

melting point is dependent on intermolecular forces. in covalent compounds, electrons are shared more equally. this means there is less separation of positive and negative charges within the molecules.

Help!!!!

I can’t understand this question

Answers

Answer:

free points!!!!!!!!!!!!!!

1. An unknown compound was found to have a percent composition of: 47.0%
potassium, 14.5% carbon, and 38.5 % oxygen. What is its empirical formula? If
the true molar mass of the compound is 166.22 g/mol, what is its molecular
formula?

Answers

Answer:The empirical formula is KCO2

Explanation:

Is heat a from of kinetic or potential energy?

Answers

Answer:

its made up of both but I would probably say kinetic

Explanation:

Yes because thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature

Copper(Ii) Iodate + Potassium Carbonate = Potassium Iodate + copper(I)carbonate into a formula equation ?

Answers

Answer:

Cu(IO3)2 + K2CO3 → 2KIO3 + CuCO3

Y’all Someone plz help me with these problems.

Girl I will report if u troll or link

Answers

Answer:

A. 650 moles of sulphur.

B. 30 g of FeS₂

Explanation:

The balanced equation for the reaction is given below:

Fe + 2S —> FeS₂

From the balanced equation above,

1 mole of Fe reacted with 2 moles of S to produce 1 mole of FeS₂.

A. Determination of the mole of sulphur needed for the reaction.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, Xmol of S will react to produce 325 moles of FeS₂ i.e

Xmol of S = 2 × 325

Xmol of S = 650 moles

Thus, 650 moles of sulphur are needed for the reaction.

B. Determination of the mass of FeS₂ produced by the reaction of 0.5 mole of sulphur.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, 0.5 mole of S will react to produce = (0.5 × 1)/2 = 0.25 mole of FeS₂.

Finally, we shall determine the mass of 0.25 mole of FeS₂. This can be obtained as follow:

Mole of FeS₂ = 0.25 mole

Molar mass of FeS₂ = 56 + (32×2)

= 56 + 64

= 120 g/mol

Mass of FeS₂ =?

Mass = mole × molar mass

Mass of FeS₂ = 0.25 × 120

Mass of FeS₂ = 30 g

Thus, 30 g of FeS₂ were obtained from the reaction.

If a sound wave refracts, what happens to it? Select all that apply.
It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.

Answers

The answer is a and c and d

If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.

What is refraction of sound wave ?

An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.

Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.

If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.

Thus, option A, C and D are correct.

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what happens to the rate of a reaction as the reaction progresses

Answers

The rate of a reaction decreases as the reaction progresses.

how does dipping an iron bucket in Molten zinc protect it?​

Answers

Answer:

It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc. The zinc protects its base metal by corroding before iron.

Explanation:

Answer:

It protects it from corrosion.

Explanation:

Zinc protects iron and steel from the relentless forces of corrosion. Galvanizing iron and steel by dipping them in molten zinc creates an alloy that can, in the right environmental conditions, protect the iron or steel beneath it for 100 years or more.

PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST
The actual subject is Science but they dont have that as a option in pick a subject

Answers

Answer:

up to down(1 to 6)

Explanation:

speed:

1,3,4

Velocity:

everything except 1,3,4

1 to 4) it’s weird yeah doesn’t like you choose your subject

Excess Fe reacted with 650mL of 0.75M H3PO4. What mass of hydrogen gas was produced? g H2



Fe + H3PO4 à Fe3(PO4)2 + H2

Answers

This is an oxidation-reduction (redox) reaction:

6 HI + 6 e- → 6 H0

(reduction)

3 Fe0 - 6 e- → 3 FeII

(oxidation)

H3PO4 is an oxidizing agent, Fe is a reducing agent

Answer: see pics. Hope it makes sense.

Explanation:

What is the mass of 1.50 mole of (NH4)2CO3?

Answers

Answer:

144.12873

Explanation:

Hope this helps you

-----------------------------------------------------------------------------------------------------------------

回答:

144.12873

説明:

これがお役に立てば幸いです

Answer:

96gm/mole

Explanation:

(NH 4)2CO 3 =2×18+12+3×16=96gm/mole

How do I perform a titration on coca-cola or Pepsi, when I cannot see the color change because the color is too dark. The indicator is phenolphthalein.

Answers

Answer: maybe you need to do very dilute solution?

Explanation: you should have an pH meter instead of indicator.

Phosphoric acid H3PO4 have three ekvivalent points.

Another way could be using a conductivity meter.

For dark reactants, use a pH meter.
For colorless WEAK reactants(acids/bases), use phenolpthalein..
For colorless STRONG reactants, use methyl orange.
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