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lidiya [134]
4 years ago
15

The carbon-14 radioisotope has proved most useful in:

Chemistry
1 answer:
valkas [14]4 years ago
8 0
Measuring the amount of radiation in an area
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State three differences between an electron and a proton
NNADVOKAT [17]

An electron is smaller than a proton. An electron has the opposite charge of a proton. An electron is outside the nucleus, while a proton is part of the nucleus.

7 0
3 years ago
What gives a pant cell a rigid shape?
pogonyaev

Answer:

Cell Wall

Explanation:

In plant cells, the cell wall is rigid the outer structure that protects the plant cell.

5 0
3 years ago
A 100-gram sample of material requires 1220 calories of heat energy to raise its temperature from 20 0C to 80 0C. What is the sp
SashulF [63]

Taking into account the definition of calorimetry, sensible heat and latent heat, the specific heat capacity of the material is 0.203 \frac{calories}{gC}.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

<h3>Specific heat capacity of the material</h3>

In this case, you know:

  • Q= 1220 calories
  • c= ?
  • m= 100 g
  • ΔT=Tfinal - Tinitial= 80 C - 20 C= 60 C

Replacing in the definition of amount of heat:

1220 calories= c× 100 g× 60 C

Solving:

c= 1220 calories÷ (100 g× 60 C)

<u><em>c= 0.203 </em></u>\frac{calories}{gC}

Finally, the specific heat capacity of the material is 0.203 \frac{calories}{gC}.

Learn more about calorimetry:

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3 0
2 years ago
Which compounds give a 1h nmr spectrum with two signals in a ratio of 2:3?
spayn [35]

Four option are provided as,

CH3CH2OCH2CH3

CH3CH2Cl

CH3CH2CH3

CH3OCH2CH2OCH3


CH3CH2Cl having 2 peaks of H NMR as 1st peak for quartet of 2 H and 2nd peak of triplet of 3 H and thus the ratio of both the peak is 2 :3 as the ratio indicates the number of hydrogen corresponds to each peak.


8 0
4 years ago
Which has the lowest freezing point?
Volgvan

Answer:

Mercury has the lowest freezing point for metals, but helium takes the winner for all substances.

Explanation:

5 0
3 years ago
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