CHEMISTRY COLLEGE

What's another name for potential energy? 1. kinetic

2. stored

3. mechanical

4. moving

Answers

Answer 1

Answer:

Answer: Stored energy

Explanation:

Answer 2

Answer:

Answer:

2. stored energy It is 100% right

Explanation:

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How many moles of H2O are produced from 6.23g of C2H6 in the following reaction? 2C2H6+7O2 -> 4CO2+6H2O

Answers

Answer:

0.623 moles of H₂O.

Explanation:

balanced equation: 2C₂H₆ + 7O₂ -> 4CO₂+ 6H₂O

Given:

6.23g of C₂H₆

C₂H₆ molar mass is 30

solve for moles of C₂H₆

moles = mass/mr

moles = 6.23/30

moles = 0.2077

solve for moles of H₂O using molar ratio

2C₂H₆ : 6H₂O

2 : 6

0.2077 : 0.623

Therefore, found that 0.623 moles of H₂O is produced.

In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. A charcoal sample from an archaeological site has a C-14 disintegration rate of 9.16 atoms per minute per gram of carbon. Estimate the age of this sample in years. The half-life of C-14 is 5730 years. (enter only the number of years in standard notation, not the unit years)

Answers

Rate of disintegration is defined as the time required by a sample or substance at which half of the radioactive substance disintegrates. It depends on the nature of disintegration and amount of substance.

The age of the sample is approximately 4241.17 years.

Given that:

C-14 atoms disintegration rates = 15.3 atom/ min-g

Rate of disintegration of the sample = 9.16 atom/ min-g

The digit proportion of carbon-14 is = $(9.16)/(15.3)$ = 0.5987

Now, also the half-life of carbon-14 is 5730 years.

Such that:

$(1)/(2)^n = \text A$

$(1)/(2) = 0.5987$

Taking log:

n log 2 = -log 0.5987

Thus, n = $(0.227)/(0.3010)$

n = 0.740

The age of the sample can be given by:

Age = n x half-life

Age = 0.740 x 5730

Age = 4241.17 years.

Therefore, the age of the substance is 4241.17 years.

To know more about disintegration rate, refer to the following link:

brainly.com/question/14021442

Answer:

The answer is "4,241 .17 years"

Explanation:

The disintegration rate, which shows in C-14 atoms = $15.3 (atoms)/(min-g)$

Rate of sample disintegration = $9.16 \frac{atoms} {min-gram}$

The digit proportion of C-14 can be determined that is included in the sample $= \frac {9.16}{15.3} \n\n = 0.5987$

5730 years from half-life.

The number with half-lives (n) which are repelled must be determined:

$((1)/(2))^n= A\n\nA= fraction of C-14, which is remaining \n\n((1)/(2))^n= 0.5987 \n\n n \log 2 = - \log 0.5987\n\n$

$\therefore \n\n \Rightarrow n= (0.227)/(0.3010) \n\n = 0.740\n$

So, the age of the sample is given by = $n *\ half-life$

$= 0.740 * 5730 \ years \n\n=4241.17 \ years\n\n$

A structural model of retinol is shown below. How many carbon atoms are inretinol?
А. 14
В. 28
С. 20
D. 5

Answers

Answer:

The answer is 20

Explanation:

Which issue is a limitation of using synthetic polymers

Answers

The main issues of using synthetic polymers include toxicity poor biocompatibility etc. Synthetic polymers stay non-degradable for ling time and make the surface polluted.

What are synthetic polymers?

Natural polymers are naturally made substances such as cellulose, starch, glycogen etc. Polymers made by man are called synthetic polymers. Synthetic polymers are diverse and are made through several polymerization techniques.

PVC, polyethylene, polyesters Teflon etc. are very common polymers in daily life. A major class of synthetic polymers include plastics which are major pollutants nowadays.

Most of the synthetic polymers are non-biodegradable and will cause landfill issues. Some them are toxic in nature and might cause several health issues. Blending them with biodegradable polymers is a solution for this.

Find more on synthetic polymers:

brainly.com/question/4047007

#SPJ2

Answer: As trash, Synthetic Polymers are not biodegradable. Landfills can easily fill up with synthetic polymers. Plastics can be made into different products. Recycling synthetic polymers is costly.

Explanation: Hope this helps in any way possible!

When a polar bond is formed between 2 atoms which atom receives a partial positive charge

Answers

Answer:

The less electronegative atom

Explanation:

Water contains polar bonds. Water is made up of oxygen and hydrogen. Oxygen is more electronegative then hydrogen so it is partial negative (because electron spend more time around oxygen in the polar bond), whereas, hydrogen has a partial positive charge as it is less electronegative (electrons spend less time around hydrogen in this polar bond).

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