To calculate the relative age of rocks, geologists use the rate of radioactive decay of isotopes present in their samples. What is the term used for the original amount of
the elemental isotopes being investigated?
A rare earth isotopes
B. Son isotopes
C. daughter isotopes
D. parent isotopes

Answers

Answer 1
A

I have had this question!!
Hope this helps!!!
Answer 2

To calculate the relative age of rocks, geologists use the rate of radioactive decay of isotopes present in their samples. Rare earth isotopes the term used for the original amount of the elemental isotopes being investigated. Therefore, option A is correct.

What is isotope ?

Isotopes are different nuclear forms of the same element. They share the same atomic number and periodic table position, but their nucleon numbers differ due to different numbers of neutrons in their nuclei.

The rare-earth elements as a group have a high number of isotopes, ranging from 24 for scandium to 42 for cerium and averaging around 35 without counting nuclear isomers.

According to estimates, the total global reserve of rare earths is around 120 million metric tons. The majority of these reserves, estimated at 44 million metric tons, are in China.

Thus, option A is correct.

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Related Questions

PLEASE HELP I ONLY HAVE 5 MINS LEFTTTT
You want to get more physically fit but often make excuses for why you don't have time to be active. What strategy can help with this problem? (3 points)

a
Find an activity you enjoy and make it a priority in your schedule
b
Wait to exercise until you are in the mood so you won't make excuses
c
Cut back on calories on days you are not motivated to be physically active
d
Only exercise at the end of the day so you are consistent every day

Answers

Answer: A

Explanation:

Answer choices B and C both involve some form of procrastination. In the question it states what is the BEST strategy and I think that that would be doing something you like to do so you don’t make excuses to not do it.

Answer:

a

Explanation:

its the only reasonable one

A teacher asked her students how a cruise ship has such a large mass is able to float in the ocean?

Answers

Cruise ships may weigh hundreds of thousands of tons, but they're still some of the best floaters out there. Of water equal to their mass (the wide, U-shaped hull helps with this). But a boat actually has a lot of open space. After all, the ocean is massive—and extremely dense. All Consent Allowed.

how many moles of xenon gas, Xe, would occopy 37.8L at stp

Answers

Answer:

The number of moles of  xenon are 1.69 mol.

Explanation:

Given data:

Number of moles of xenon = ?

Volume of gas = 37.8 L

Temperature = 273 K

Pressure = 1 atm

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will put the values in formula.

1 atm × 37.8 L = n ×  0.0821 atm.L/ mol.K   ×273 K

37.8 atm.L =  n × 22.413 atm.L/ mol.

n = 37.8 atm.L /  22.413 atm.L/ mol.

n = 1.69 mol

The number of moles of  xenon are 1.69.

5. Common (most stable) mass numbers of the following elements are Al-27, Pt-195, Co-59,
Ag-108, and Au-197 respectively. Shorthand notation is written with a mass number on the
top and atomic number on the bottom of the element symbol. Check letters a-d in 4 above
and use those as examples to write the shorthand notation of the following elements and
determine the number of neutrons in each element.
Aluminum
Platinum
Cobalt
Silver
Gold

Answers

Answer:

Number of neutrons of Al²⁷₁₃ = 14

Number of neutrons of Pt¹⁹⁵₇₈= 117

Number of neutrons of Co⁵⁹₂₇= 32

Number of neutrons of Ag¹⁰⁸₄₇= 61

Number of neutrons of Au¹⁹⁷₇₉ = 118

Explanation:

We know that atomic number of an atom is number of electron or protons while atomic mass is sum o number of neutrons and and protons.

Shorthand notations of given elements:

Al²⁷₁₃

This notation shows that atomic number of Al-27 is 13 and atomic mass is 27.

Number of neutrons of Al²⁷₁₃  = 27 - 13

Number of neutrons of Al²⁷₁₃ = 14

Pt¹⁹⁵₇₈

This notation shows that atomic number of Pt-195 is 78 and atomic mass is 195.

Number of neutrons of Pt¹⁹⁵₇₈  = 195 - 78

Number of neutrons of Pt¹⁹⁵₇₈= 117

Co⁵⁹₂₇

This notation shows that atomic number of Co-59 is 27 and atomic mass is 59.

Number of neutrons of Co⁵⁹₂₇  = 59 - 27

Number of neutrons of Co⁵⁹₂₇= 32

Ag¹⁰⁸₄₇

This notation shows that atomic number of Ag-108 is 47 and atomic mass is 108.

Number of neutrons of Ag¹⁰⁸₄₇  = 108 - 47

Number of neutrons of Ag¹⁰⁸₄₇= 61

Au¹⁹⁷₇₉

This notation shows that atomic number of Au-197 is 79 and atomic mass is 197.

Number of neutrons of Au¹⁹⁷₇₉  = 197 - 79

Number of neutrons of Au¹⁹⁷₇₉ = 118

Please help me with this question​

Answers

Answer:

it absorbed it

Explanation:

it going up shows that it absorbed thermal energy because that's the temperature. when temperature goes up thermal energy comes in

Which of these is a compound? оо CO2 o 02 O CO​

Answers

Answer: C02


The answer is CO2 because 02 is a oxygen molecule and CO is a carbon monoxide!

Who's model was titted the atomic theory of matter"? *

Answers

Answer:

John Dalton

Explanation:

Answer:

John Dalton, an English chemist, inferred that atoms had certain characteristics. He began to propose an atomic the- ory and model for atoms. The main ideas of Dalton's theory are summarized in Figure 2. With only a few changes, Dalton's atomic theory is still accepted today.

Explanation:

Calculate the number of water molecules formed of 0.562 moles of oxygen gas in

2 H2 (g) + 1 O2 (g) ⟶ 2 H2O (g)

Answers

Answer:

6.77 · 10²³ molecules H₂O

Explanation:

Step 1: Define

2H₂ (g) + O₂ (g) → 2H₂O (g)

0.562 mol O₂

Step 2: Use Stoichiometry

[tex]0.562 \hspace{3} mol \hspace{3} O_2(\frac{2 \hspace{3} mol \hspace{3} H_2O}{1 \hspace{3} mol \hspace{3} O_2} )[/tex] = 1.124 mol H₂O

[tex]1.124 \hspace{3} mol \hspace{3} H_2O(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} H_2O}{1 \hspace{3} mol \hspace{3} H_2O} )[/tex] = 6.76648 · 10²³ molecules H₂O

Step 3: Simplify

We have 3 sig figs.

6.76648 · 10²³ molecules H₂O ≈ 6.77 · 10²³ molecules H₂O

An atom's Lewis dot structure has two dots. Which of the following elements could it be, and why?
A)Calcium, because it is an alkaline earth metal with two inner shell electrons. B)Carbon, because it has two electrons in its outermost p sub level.
C)Lithium, because it is a group 1 element with two bonding electrons. D)Magnesium, because it is a group 2 element with two valence electrons.

Answers

Answer:

The answer is D, Magnesium.

a certain atom has a green spectrum line of about 540 nm. what is the difference in energy between the two energy levels responsible for producing the line?

Answers

Answer:

[tex]\Delat E=3.7\times 10^{-19}\ J[/tex]

Explanation:

The difference in energy between the two energy levels is given by :

[tex]\Delta E=\dfrac{hc}{\lambda}[/tex]

Where,

h is Planck's constant

c is speed of light

[tex]\lambda[/tex] is wavelength

So,

[tex]\Delta E=\dfrac{6.67\times 10^{-34}\times 3\times 10^8}{540\times 10^{-9}}\\\\\Delta E=3.7\times 10^{-19}\ J[/tex]

So, the energy difference is [tex]3.7\times 10^{-19}\ J[/tex].

The difference in energy between the two energy levels that is responsible for producing the green spectrum line is equal to [tex]3.68 \times 10^{-19}\; Joules[/tex].

Given the following data:

Wavelength = 540 nm = [tex]540 \times 10^{-9} meters[/tex]

Speed of light = [tex]3 \times 10^8\;meters[/tex]

Planck constant = [tex]6.626 \times 10^{-34}\;J.s[/tex]

To determine the difference in energy between the two energy levels that is responsible for producing the green spectrum line, we would apply Einstein's equation for photon energy:

Mathematically, Einstein's equation for photon energy is given by the formula:

[tex]\Delta E = hf = h\frac{v}{\lambda}[/tex]

Where:

[tex]\Delta E[/tex] is the change in energy.h is Planck constant.f is photon frequency.[tex]\lambda[/tex] is the wavelength.v is the speed of light.

Substituting the given parameters into the formula, we have;

[tex]\Delta E = \frac{6.626 \times 10^{-34} \;\times \;3.0 \times 10^{8}}{540 \times 10^{-9}} \\\\\Delta E = \frac{1.99 \times 10^{-25}}{540 \times 10^{-9}}\\\\\Delta E = 3.68 \times 10^{-19}\; Joules[/tex]

Note: [tex]1 \;nanometer = 1 \times 10^{-9} \;meter[/tex]

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uranium in the isotope below had 140 nutrons​

Answers

Answer:

It has 140 neutrons because Mass number= No of protons + no of neutrons

Review the desert food web above. What organism, absent in the web, would be MOST responsible for recycling organic matter back through the food web?
A) cougars
B) bacteria
C) sage brush
D) cactus plants

Answers

I think it is bacteria

Which of these statements about half-life is true? Check all that apply. Half-lives vary dramatically from isotope to isotope. A relationship exists between isotopes and half-lives. Half-lives are constant for a particular isotope. Half-life is an exact measure of when individual atoms will decay. Temperature, pressure, and density affect the half-life of an isotope.​

Answers

Answer:

Half-lives vary dramatically from isotope to isotope.  Half-lives are constant for a particular isotope.                                                

Explanation:

A,C

The correct statement about half life time is half lives vary dramatically from isotope to isotope and it is constant for a particular isotope.

What is half life time?

Half life time of any reaction is that time where the concentration of product will become half of the initial concentration of reactant.

Half life time is not same for every substance it will vary from substance to substance. And for any particular substance half life time is constant untill the whole degradation of that substance. Half ife time is not depends on temeprature and pressure because it is not the rate.

Hence, half life time is constant for particular isotope and vary from isotope to isotope.

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A jet engine might use _____.

rapid combustion
respiration
slow combustion
nitrous oxide

Answers

The answer is A, rapid combustion. Hope this helps!

Answer:

A jet engine might use rapid combustion.

Hope this helps!

Have a great day! :))))

I know this because i had this on a test yesterday and got it right.

Leslie wants to know which advertising medium works best to promote her electronics store. She surveys her customers over a weekend and creates a bar graph. Based on her survey, which advertising mediums will work best to publicize Leslie’s in-store specials

Answers

No survey to base on

Answer:

option 4=d

Explanation:

the internet and printed flyers have the highest score on the bar graph therefor the two are the best bet and the correct option

Can someone answer the bottom question (22-25)

Answers

22) Oxygen with a -2 charge
23) Neon with a +2 charge
24) Fluorine with a -1 charge
25) Lithium with a +1 charge

Show work

7. How many mm are there in 2.3Mm?
8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.
Is this metal copper?
9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??
10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?

Answers

Answer:

7 =  2.3× 10⁺⁹ mm

8 = The density of copper is 6.55g/cm³ so the given metal is not copper.

9 = mass of liquid is 7.8 g

10 = mass of liquid is 8050 g.

Explanation:

7. How many mm are there in 2.3Mm?

mm is the symbol of millimeter.

Mm is the symbol of megameter.

1 mm = 10⁻⁹Mm

so in order to convert 2.3Mm into mm we will multiply the given value with 10⁺⁹

2.3 mm × 10⁺⁹ = 2.3× 10⁺⁹ mm

8. Copper has a density of 6.55g/cmº. A. piece of metal has a mass of 48.3g and a volume of 7.2cm.

Is this metal copper?

Given data:

Density of copper = 6.55 g/cm³

Mass of metal = 48.3 g

Volume of metal = 7.2 cm³

Is the metal is copper = ?

Solution:

The given problem will be solved through the density formula.

D = m/v

We will put the values in formula to calculate the density.

d = 48.3 g/ 7.2 cm³

d = 6.71 g/cm³

The density of copper is 6.55g/cm³ so the given metal is not copper.

9. What is the mass of a liquid whose volume is 6.0 mL and a density of 1.3 g/cm??

Given data:

Volume of liquid = 6.0 mL (1 mL = 1cm³)

Density of liquid = 1.3 g/cm³

Mass of liquid = ?

Solution:

Formula:

D = m/v

By putting the values in formula.

1.3 g/cm³ = m / 6 cm³

m =  1.3 g/cm³ × 6 cm³

m = 7.8 g

mass of liquid is 7.8 g.

10. You have 3.50 L of a liquid, whose density is 2.3g/cm3. What is it's Mass?

Given data:

Volume of liquid = 3.50L (3.50 ×1000 = 3500 cm³)

Density of liquid = 2.3g/cm³

Mass of liquid = ?

Solution:

Formula:

D = m/v

By putting the values in formula.

2.3g/cm³ = m /3500cm³

m = 2.3 g/cm³ × 3500 cm³

m = 8050 g

mass of liquid is 8050g.

What is the number of electrons in the outermost energy level of an oxygen atom?

Answers

Answer:

6 electrons.

Explanation:

An atom of oxygen has six electrons in its outermost energy level, and these are called valence electrons.

3 mL is equal to:
a.3 cm 2
b.3L
c.3 cm 3

Answers

Answer:

C

Explanation:

1mL = 1cm

3 * 1 = 3cm³

We use "³" because we are working with units that represent volume.

Best of Luck!

How many atoms are
below?
C6H1206

Answers

Answer:

24 atoms

Explanation:

6 Carbon atoms

12 Hydrogen atoms

6 Oxygen atoms

how are atoms structured

Answers

Answer:

they got protons, electrons, and neutrons

Explanation:

Answer:

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Explanation:

Which best compares freezing and condensation?

Both involve changes between liquids and gases.
Both involve changes between gases and solids.
Both involve the release of heat.
Both involve the absorption of heat.

Answers

They both involve the release of heat

According to the forces of attraction, the statement which  best compares freezing and condensation is that both  involve the release of heat.

What are forces of attraction?

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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A scientist develops a new experiment to test atomic theory. His results do not agree with the theory.

What will most likely happen next?
Scientists worldwide will reject atomic theory because of the new results.
The scientist will change his results to agree with the accepted theory.
Other scientists will reject the results because they do not agree with the theory.
The scientist will repeat the experiment to make sure that his results are reliable.

Answers

Answer:

When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.

Explanation:

In the scientific context, each new experiment must be performed with precision and following the steps of the scientific method.

An experiment that does not provide reliable data to demonstrate a theory must be reviewed in detail and performed again to confirm the data obtained in the first attempt.

A theory is a postulate that tries to explain a natural phenomenon, but whose argument can be discussed or does not have the acceptance of a law. When the theory is proven and there are no arguments against it, it can be universally accepted and becomes a law.

The other options are not valid due to:

Scientists worldwide will reject atomic theory because of the new results.  A theory cannot be discarded without solid arguments or evidence in order to dismiss it and establish a new one.The scientist will change his results to agree with the accepted theory.  This would be an unethical procedure and unacceptable to the scientific community.Other scientists will reject the results because they do not agree with the theory. The opinion of other scientists is not enough to dismiss a theory, if it has a valid scientific basis.

Answer:

When the results of a new experiment to test atomic theory do not agree with the theory, scientist will repeat the experiment to make sure that his results are reliable.

Explanation: CAUSE I COPPIED HIM SORRY OTHER MAN NEEDED THE POINTS

how many sig figs are there? 306.2

Answers

Answer:

There are four significant figures in given measurement.

Explanation:

Significant figures:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.

In given measurement 306.2 there are 4 significant figures.

3,0,6,2

All digits are significant.

R is the midpoint of FG.

FR = 26 find RG

Answers

Answer:

52

Explanation:

This is because if R is the midpoint of FRG, FR is half of FRG, so basically all you do it multiply by 2 to get the FRG

An ion has 14 protons, 15 electrons, and 14 neutrons. What charge does this ion have?

Answers

Answer:

it would have A positive charge



Can a single atom be considered a molecule?

Answers

Answer: no

Explanation:

Answer: yes it can

Explanation: hope it help

An object was measured by a worker as 35.6cm long, however, the manufacturer specifications list the length of the object at 35.0cm. What is the percent error In the workers measurement?

Answers

Answer:

----1.71%----

Question 7 of 25
Lighting a match is an example of what kind of energy conversion?
O A. Chemical potential energy being converted to heat energy
B. Kinetic energy being converted to chemical potential energy
C. Chemical potential energy being converted to kinetic energy
D. Gravitational potential energy being converted to heat energy

Answers

Answer:

A

Explanation:

APEX

Lighting a match is an example of chemical potential energy being converted to heat energy. The correct option is A.  

What is the conversion of energy?

Conversion of energy is when the energy is converted from one form into another form. When chemical or physical reactions occur, there is always a conversion of energy from one form to another.

When we match a light, there is a chemical, Phosphorous sulfide which is rubbed against other chemical, and react and produce fire, so it is converted into heat energy.

Thus, the correct option is A. Chemical potential energy is converted to heat energy regarding lighting a match.

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The mass on the periodic table is called

Answers

The mass of an element on the periodic table is called atomic mass.
Other Questions
A companys stock was selling at $25 a share a month later it was selling at $30 a share what is the percent increase Pls help this is really hard You are the chief speaker in a debate of the topic, leadership is the problem of this country, write you speech in 450 words? We have follow the laws and safe and be careful Whats the timline of the revolutionary war Car PaymentsYour aunt bought a new car After three months of car payments she owed a total of$22 275 to the bank for the car loan. After 12 months, she owed $18,900 to the bankfor the car loan What was her average payment rate on the principal of the car loanduring this time?13. 22.2757(12, 18,000)24,00020,000Money Owed 16,000(dollars)12.0008,0004,0002124 6 8 10Time months)CHECKper monthOType here to searchWhat was her average payment rate on the principal of the car loan during this time? Which of the following powers is NOT included in the Constitution?O the government must provide education to all citizensthe duties of the presidentthe term limitations of Congress membersthe powers of the Supreme Court which ordered pair represents a solution to both equations? A - (-5,5) B - (-2,1) C - (1, -2) D - (-4,0) Comprehensive Ratio AnalysisData for Lozano Chip Company and its industry averages follow.Lozano Chip Company: Balance Sheet as of December 31, 2013 (Thousands of Dollars)Cash $ 225,000 Accounts payable $601,866Receivables 1,575,000 Notes payable 326,634Inventories 1,125,000 Other current liabilities 525,000Total current assets $2,925,000 Total current liabilities $1,453,500Net fixed assets 1,350,000 Long-term debt 1,068,750Common equity 1,752,750Total assets $4,275,000 Total liabilities and equity $4,275,000Lozano Chip Company: Income Statement for Year Ended December 31, 2013 (Thousands of Dollars)Sales $7,500,000Cost of goods sold 6,375,000Selling general and administrative expenses 825,000Earnings before interest and taxes (EBIT) $ 300,000Interest expense 111,631Earnings before taxes (EBT) $ 188,369Federal and state income taxes (40%) 75,348Net income $ 113,022Calculate the indicated ratios for Lozano. Round your answers to two decimal places.Ratio Lozano Industry AverageCurrent assets/Current liabilities 2.0Days sales outstanding* days 35.0 daysCOGS/Inventory 6.7Sales/Fixed assets 12.1Sales/Total assets 3.0Net income/Sales % 1.2%Net income/Total assets % 3.6%Net income/Common equity % 9.0%Total debt/Total assets % 30.0%Total liabilities/Total assets % 60.0%*Calculation is based on a 365-day year.Construct the extended Du Pont equation for both Lozano and the industry. Round your answers to two decimal places.For the firm, ROE is %For the industry, ROE is %Outline Lozano's strengths and weaknesses as revealed by your analysis Find the slope of the line from the equations: y = -2/3x 1 Which acts prompted the Battle of the Rice Boats? Check all that apply.The British seized rice ships for supplies.Colonists refused to accept rice from the British.The British invaded by disguising ships as merchant boats.Colonists wanted to protect Savannah from capture.The British tried to tax the rice on the ships. What are cellsssss??? Today has been a really long day, so if someone is up to do this for me that would be perfect. What is the main characters job?in the story if cornered scream (01.01 LC) Which of the following is the portion of a line that starts at one point and goes off in a particular direction to infinity? Angle Circle Ray Vertex Simplify the expression.56 (7) how are reflections mathematical formulas used in the computer industry? Which of these is a characteristic of science? Rellene los huecos con el verbo encantar y gustar:1. A los chilenos ____________ _____________________ (gustar) viajar slo en este hemisferio.2. A David y yo ____________ ____________________ (encantar) el chocolate.3. ______________ _____________________ (gustar) la comida salvadorea a Juanitay Jorge.4. A los chilenos ____________ _____________________ (gustar) mucho las playas. Help me out here pls