1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
FrozenT [24]
2 years ago
7

The half-life of carbon-14 is about ____________ years. Fill in the blank.

Chemistry
2 answers:
erma4kov [3.2K]2 years ago
8 0

Answer:

5730 years

Explanation: for more on radiocarbon dating.) and hence explain why the amount of carbon-14 in the sample decays by half over any period of 5730 years.

katrin2010 [14]2 years ago
5 0
The half-life of carbon-14 is about 5730 years
You might be interested in
A pyramid of energy is used to analyze the amount of energy available at each feeding level in a food chain. Using the pyramid a
Troyanec [42]
C is the answer it’s not d because mackerel does not eat tuna I’m not sure tho
8 0
3 years ago
Read 2 more answers
Need help on stoichiometry asap please
lbvjy [14]
1. Convert 135g Fe2O3 to moles, divide by 2, and multiply the resulting number by the molar mass of Al
8 0
3 years ago
Thomas has 235 grams of K2S in the chemistry lab. How many atoms of potassium (K) are in 235 grams of the compound?
iVinArrow [24]

The  number of atoms  of K that are in 235 g  of the compound  is

2.57 x10^24 atoms


 calculation

Step 1:  find the moles of K2S

= moles = mass/molar mass

=  235 g/110 g/mol= 2.136  moles

Step 2: multiply  2.136 moles  by no. of K atoms in K2S

= 2.136  x2 = 4.272 moles


Step 3: use the Avogadro's  law to determine number of K atoms

that is according to Avogadro's law  1 mole = 6.02 x 10^23  atoms

                                                            4.272 moles= ? atoms

by cross multiplication

= (4.272  moles x 6.02 x10^23 atoms)  / 1 mole = 2.57 x10^24 atoms

4 0
3 years ago
Which statements are true?
schepotkina [342]

Explanation:

  • Evaporation is defined as a process in which liquid state of water is changing into vapor state.

So, we need to break the bonds of liquid substance in order to convert it into vapor state. And, energy is absorbed for breaking of bonds which means that evaporation is an endothermic process.

Hence, the statement evaporation of water is an exothermic process is false.

  • When a hydrocarbon reacts with oxygen and leads to the formation of carbon dioxide and water then this type of reaction is known as combustion reaction.

A combustion reaction will always release heat energy. Hence, combustion reaction is exothermic in nature.

  • When energy is transferred as heat from the surroundings to the system then it means energy is being absorbed by the system. And, absorption of heat is an endothermic process for which \Delta H is positive.
  • Whereas when energy is transferred from system to the surrounding then it means energy is released by the system which is an exothermic process.

Hence, for an exothermic process value of \Delta H is negative.

Thus, we can conclude that statements which are true are as follows.

  • A combustion reaction is exothermic.
  • When energy is transferred as heat from the system to the surroundings, \Delta H is negative.
  • For an endothermic reaction Deta H is positive.
5 0
3 years ago
What element is this?
LiRa [457]

i think helium hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

8 0
3 years ago
Other questions:
  • The steps leading to an algal-bloom fish kill
    14·1 answer
  • Lead oxide is formed when a lead cation that has a charge of 2+ combines with an oxygen anion that has a charge of 2-. Using the
    10·2 answers
  • Which term names a metamorphic change in rocks over a wide area from tectonic forces in Earth's crust and mantle? A. local metam
    8·2 answers
  • 20 pts. Hydrogen and oxygen react to form water.
    14·1 answer
  • What is a dependent variable?
    14·2 answers
  • The gases listed are at standard temperature and pressure: · 1 mol of CO2 gas · 1 mol of N2 gas · 2 mol of O2 gas Which statemen
    9·2 answers
  • Which of the following accounts for the differences among the various amino acids
    10·1 answer
  • The table below shows the number of sub-atomic particles in an atom of sodium. Sub-atomic Particles Sub-atomic Particle Number P
    13·2 answers
  • How might the biodiversity of a mowed lawn compare to that of huge weedy field?
    15·1 answer
  • What are some questions you would ask to learn more about the toxic algal bloom in Lake Temescal? Include at least two questions
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!