The radioactive isotope used in the dating of fossils thought to be less than 40,000 years old is ________________.

Fill in the blank.

Answers

Answer 1

Answer:

The answer is Radiocarbon


Related Questions

I need help (yes again)

Answers

Answer:

with what?

Explanation:

The three types of symbiosis are ___ and ___

Answers

Answer:

mutualism,commensalism and parasitism

Answer:

mutualism, commensalism, and parasitism

If you wanted to change the polarity of hydrogen bromide (HBr) by substituting the bromine by a different atom. Which atom would increase the polarity of the molecule?

Answers

Answer:

Chlorine

Explanation:

The Polarity of an atom is characterized as the dipole to dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule. Thus, the 'chlorine' atom would help in enhancing the polarity of hydrogen bromide(HBr) with 3.16 electronegativity as we know, the electronegativity increases if we move upwards in the periodic table.

.Which statement about transition elements is correct?A Their soluble salts usually form coloured aqueous solutions. B They are all in the same group of the Periodic Table. C They are non-metals with high melting points. D They can be mixed together to form compounds

Answers

Answer:

A Their soluble salts usually form coloured aqueous solutions

Negative ions have ______ (More or Less) protons than electrons.

Answers

Answer:

Less

Explanation: I took the test.

Answer: negative ions have less protons than electrons.

Explanation:

the following body systems is responsible for releasing waste?

Answers

Answer:

the urinary system??

Explanation:

In the following reaction, how many grams of H2O are produced if 2.00 g of N2H4 react? N2H4 + 3 O2 ---> 2NO2 + 2H2O

Answers

Answer:

2

Explanation:

From this equation, 2 grams are produced.

The mass of H₂O produced from the reaction is 2.25 g

We'll begin by calculating the mass of N₂H₄ that reacted and the mass of H₂O produced from the balanced equation.

N₂H₄ + 3O₂ —> 2NO₂ + 2H₂O

Molar mass of N₂H₄ = (2×14) +(4×1) = 32 g/mol

Mass of N₂H₄ from the balanced equation = 1 × 32 = 32 g

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Mass of H₂O from the balanced equation = 2 × 18 = 36 g

SUMMARY

From the balanced equation above,

32 g of N₂H₄ reacted to produce 36 g of H₂O.

Finally, we shall determine the mass of H₂O produced by the reaction of 2 g of N₂H₄

From the balanced equation above,

, 32 g of N₂H₄ reacted to produce 36 g of H₂O.

Therefore,

2 g of N₂H₄ will react to produce = (2 × 36) / 32 = 2.25 g of H₂O

Thus, the mass of H₂O produced from the reaction is 2.25 g

Learn more: https://brainly.com/question/13403073

. The model shows Earth in several positions relative to the Sun. In which position is it winter in North America?​

Answers

What does the model look like
all the way to the right

3 way to make bases​

Answers

Sorry it’s really unclear what your asking

Convert 62.5 L to mm
3

Answers

Answer:

0.0625

Explanation:

Answer:

62,500

Explanation:

This is a science question. What is the skateboarder’s acceleration?

Answers

Answer:

2.4

Explanation:

Divide 7.0 by 3.0 you get 2.333333 then round it of to 2.34

what is the electron configuration for lithium​

Answers

Answer:

2,1

Explanation:

the electron configuration is 2s1

what happens to the electronegatity when you go from top to bottom on the periodic table?

Answers

Answer:

It decreases

Explanation:

As you go down a group from top to bottom, the electronegativity decreases. Across a period, electronegativity increases from left to right.

Electronegativity is the tendency with which the atoms of the element attracts valence electrons in a chemical bond. The more electronegative an element is, the stronger its affinity for electrons. Electronegativity values less than 2 shows an element is a metal. Metals are generally electropositive.

I WILL MARK BRAINLIEST!!!!! !!



(picture included with one question ^^^^^^^)

Answers

Answer:

type D

balance form .b

Explanation:

Which pair of elements is most likely to form an ionic compound with each other?



sulfur and carbon


barium and chlorine


oxygen and fluorine


calcium and sodium

Answers

Barium and chlorine

True or False: Plants don't have brains, but they still adapt to their environments.

Answers

Answer:

True

Explanation:

I just took that last year, and got a100%

True, Plants don't have brains, but they still adapt to their environments.

What is adaptation?

Adaptation is a process where they are changing their nature to suit the environment.

We have seen that plants do adaptation according to the environment, as in the summer season their leaves are hanging down but in the rainy season they show blossoms and green leaves. So, according to the environment for the survival and reproduction they adapt their body.

Hence, plants have no brains, but they still adapt.

To learn more about adaptation, visit the below link:

https://brainly.com/question/2396978

How do the products of chemical reactions compare to their reactants?

Question 5 options:

The products often have completely different properties than the reactants.


The products usually weigh more than the reactants.


The products usually have more atoms than the reactants.


The products are usually more toxic than the reactants.

Answers

Answer: The products usually weigh more than the reactants.

Explanation:

Answer:

A

Explanation:

i just took the k12 test

please help ASAPPP
will mark brainliest!!!

Answers

Greetings!______________________________________Answer:[tex]OH^{-1}[/tex]WHY IS OPTION A NOT POLYATOMIC?

The polyatomic ions are those ions which has more than two atoms involved such as the other options than OH^-1 in the question. The OH^-1 ion is the diatomic ion because it has only 2 atoms

______________________________________HOPE IT HELPS!

n which phase(s) of matter are the atoms closely packed but still able to slide past each other?

gas
liquid
solid and gas
liquid and solid

Answers

Answer:

I belive its liquid if I'm right because liquids are packed together when they take shape but they are still able to move.....brainliest???

Answer:

Liquid

Explanation:

Please don't jugde me if I got it wrong

The mass of a block is 2.5 g the volume of the block is 4.1 mL.  what is the density of the block

Answers

Answer:

6.6g

Explanation:

Elements that are generally shiny when smooth and clean.

Answers

metals are elements that are generally shiny when smooth and clean

Match each term with the correct description below.
1. what is a charged atom that has gained one or more electrons?

2. What substance is held together by ionic bonds?

3. What metal and nonmetal transferrers electrons?

4. What particle has electrons that are shared unequally?

5. What forms when atoms share electrons by covalent bonds?

6. What two nonmetals share electrons?

7. What charge atom that has lost one or more electrons?

8. What two or metals "pooling" electrons?

a. metallic bond

b. covalent bond

c. anion

d. ionic bond

e. molecule

f. cation

g. compound

h. polar molecule

Answers

Answer:

1. anion

2. compund

3. ionic bond

4. polar molecule

5. molecule

6. covalent bond

7. cation

8. metallic bond

Explanation:

Question 6 (1 point)
Sound, earthquakes, and waves in water are rechanical waves because they require
a physical to transport energy. (Lesson 4.02)
O electromagnetic field
O disturbance
O medium
location

Answers

Answer: The answer is MEDUIM

Explanation:

How many electrons does each atom have? What group is each in?

Answers

In an atom, the electron's spin around the center, also called the nucleus. The electrons like to be in separate shells/orbitals. Shell number one can only hold 2 electrons, shell two can hold 8, and for the first eighteen elements shell, three can hold a maximum of eight electrons. ( This is the answer to both questions!)

Some things that can be made from coal are...
A. All of the above
B. Tar
C. Generating power
D. Plastics
E. Fertilizer

Answers

Answer:A

Explanation:just casuse

Determine the mass of 2.86 mole Co(NH3)6Cl3

Answers

Answer:

765 g Co(NH₃)₆Cl₃

General Formulas and Concepts:

Reading the Periodic Table of Elements

Explanation:

Step 1: Define

2.86 mol Co(NH₃)₆Cl₃

Step 2: Define conversions

Molar Mass of Co - 58.93 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of Co(NH₃)₆Cl₃ - 58.93 + 6(14.01) + 18(1.01) + 3(35.45) = 267.52 g/mol

Step 3: Dimensional Analysis

[tex]2.86 \ mol \ Co(NH_3)_6Cl_3(\frac{267.52 \ g \ Co(NH_3)_6Cl_3}{1 \ mol \ Co(NH_3)_6Cl_3} )[/tex] = 765.107 g Co(NH₃)₆Cl₃

mol Co(NH₃)₆Cl₃ and mol Co(NH₃)₆Cl₃ cancel outWe are left with grams (mass)

Step 4: Simplify

We are given 3 sig figs. Follow sig fig rules.

765.107 g Co(NH₃)₆Cl₃ ≈ 765 g Co(NH₃)₆Cl₃

State which statement is a physical change or a chemical change:
(a) Sawing wood
(b) Cooking eggs
(c) Melting chocolate
(d) Chewing sweets
(e) Rusting iron
(f) Filing your fingernails
(g) Milk turning sour
(h) Blow-drying your hair
(i) Boiling water
(j) Baking a cake
(k) Burning a match

Answers

Answer:

Physical change: A,C ,D, F, H, I

Chemical Change: B, E, G, J, K

What are isotopes?
A.) Atoms of the same element that have a different number of protons
B.) Atoms of the same element that have a different number of neutrons
C.) Atoms of different elements that have the same number of neutrons
D.) Atoms that are unstable

Answers

Answer:

B

Explanation:

Answer:

B. ATOMS OF THE SAME ELEMENT THAT HAVE A DIFFERENT NUMBER OF NUETRONS

Explanation:

Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Based on the figure below, what do the elements of a group (family) have
in common

Answers

Answer:

Explanation:

Send figure below

Atoms that gain
an electrons
have a _____
Charge?

Answers

negative charge some extra characters

Answer:

positive

Explanation:

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A brown eyed person (BB) and a blue eyed person (bb) have several children. Which of these statements describe the probable eye color of their children?1.All will have blue eyes2.All will have brown eyes3.Half will have brown eyes, and half will have blue eyes4.Less than half will have brown eye Which are equivalent equations? Select two correct answers.d1 = 2Ad2d1 = d 1 equals StartFraction 2 A Over d 2 EndFraction.d2 = d 2 equals StartFraction d 1 Over d2 A EndFraction.d2 = d 2 equals StartFraction 2 A Over d 1 EndFraction.d2 = 2Ad1 Name everything that happened that you know about the Titanic. I already know everything, I just want people to answer it anyways to see what other people know. Also, you can see I am a person who doesn't put only 5 points for an answer. Which statement best compares Persian, Syrian, and Roman rule over the Jewish people? The Persians and Syrians held Jewish people captive until the Romans freed them. The Persians and the Romans both destroyed the Temple of Jerusalem, while the Syrians helped rebuild it. The Persians and the Romans both allowed Jewish people to practice their religion, while the Syrians outlawed Judaism. The Persians and the Romans forced the Jewish people into exile, while the Syrians did not. Noah says that to find 20% of a number he divides the number by 5. For example, 20% of 60 is 12, because 605=12. Does Noahs method always work? Explain why or why not. Zheng He contributed to the prosperity of China under the Ming dynasty by pls help fast!!! thank you :)) 2. Past simple and present perfect (30 marks)Put the verb in brackets into the correct tense, either past simple or present perfecta. Yesterday, my dog..(bite) my brother.b. Since 8am, I have drunk..(drink) 3 bottles of water. I am so thirsty today.c. Until 2001, people..(not have) a proper government in this town.d. In March, we(leave) the school and havent been back since.e. My mother.(just buy) a car its beautiful.f. I.(already wear) this T-shirt twice this week. I need to wash it!g. Last week, my father(give) me a new phone.h. I (write) 8 compositions for Gill this year.i. Two days ago there.(be) a terrible accident here.j. Andrs..(not set) the math exam yet.k. He .(lie) on the bed all day. He is so lazy!l. They.(not see) each other for three years.m. On Saturday, I ..(go) shopping with my best friend.n. In 2019, the school..(pay) 200million COP to repair this road.o. I(not eat) anything since Tuesday as I have a bad stomach. y+16= -8Another Question heheh I'M GIVING BRAINLIESTI just need help with the equation, you don't have to solve it Answers for quiz on edge are:1. Which of the following would be the best answer for the question given in the audio?A) en el aula2. Where is this person most likely going?D) a la escuela3. Why is the speaker upset?D) He forgot to bring his homework home.4. What can't the student buy?C) computer5.What is Sara going to do after school?C) estudiar I need help with this question ASAP Which of following Incan structures was a large hall used for community gatherings?a. qollqab. kanchac. masmad. kallanka please help with my greek and Latin in English class PLS HELP I ONLY HAVE 7 MINUTES LEFT Which statement best describes the Sahel? A.It is the largest desert in the world, and it covers most of North Africa.B.It is a savanna in East Africa that is home to the worlds largest wildlife migrations.C.It is the region between the Sahara Desert and the African savanna.D.It is a dense tropical woodland located in the Congo River Basin. Colonists marched at Anahuac for all of the following reasons, excepta. they wanted to independence from Mexico.b. they disliked the Decree of 1830.c. they were demanding the release of William B. Travis and Patrick C. Jack.d. they wanted the Mexican Constitution of 1824 to be followed. Someone help me plsss:) What is going on in the United States in the 1820s that would give Monroe the confidence to establish the Monroe Doctrine? Tropical, temperate, and polar describe climate zones due toA. latitude.B. rainfall amount.C. temperature.D. snowfall amount. What is the sum of F(X) and G(x) if F(x) = 8x ^ 3 + 7x ^ 2 - 11x + 20 and G(x) = - 5x ^ 3 - 4x ^ 2 - 17