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ira [324]
3 years ago
13

The length of a year is equivalent to the time it takes for one.. (pls help I honestly forgot )

Chemistry
1 answer:
Ainat [17]3 years ago
8 0
For one complete orbit of the earth around the sun
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Using the table of average bond energies below, the delta h for the reaction is
Sindrei [870]
Using the table of average bond energies the delta h is the <span>the delta h lol</span>
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4 years ago
The half life for the decay of carbon- is years. Suppose the activity due to the radioactive decay of the carbon- in a tiny samp
EleoNora [17]

The question is incomplete. The complete question is:

The half-life for the decay of carbon-14 is 5.73x10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of woodfrom an archeological dig is measured to be 2.8x10^3 Bq. The activity in a similiar-sized sample of fresh wood is measured to be 3.0x10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.

Answer:

570 years

Explanation:

The activity of the fresh sample is taken as the initial activity of the wood sample while the activity measured at a time t is the present activity of the wood artifact. The time taken for the wood to attain its current activity can be calculated from the formula shown in the image attached. The activity at a time t must always be less than the activity of a fresh wood sample. Detailed solution is found in the image attached.

6 0
4 years ago
Sharpening a pencil leaves behind pencil shavings. is sharpening a physical or chemical change
IgorLugansk [536]
Physical damage. 

If you burned the pencil, it would be considered chemical. 
6 0
3 years ago
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Marysya12 [62]
C is the correct answer since it outputs and inputs chemicals
4 0
4 years ago
Are the changes from a to b and from b to c physical or chemical changes?
Vitek1552 [10]

Answer:

They are physical changes.

Explanation:

This is because there in no chemical reaction taking place, just a physical change.

A physical change in a change in which the chemical structure of the substance does not change. Ice, water and steam are all the same on a molecular level, thus changing from ice to water or from water to steam are physical changes.

A chemical change is a change in which the chemical structure of the substance undergoes a change, since this does not happen going for A to B or B to C they are not chemical changes.

6 0
3 years ago
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