Which bond is broken when energy is released?

2 answers:

7 0

Energy can be released or absorbed when various chemical bonds form or are broken. Exothermic reactions release energy in the form of heat whereas endothermic reactions absorb energy.

blsea [12.9K]3 years ago

4 0

Energy is released when a new bonds form.

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Why does the density of a substance stay constant even if the mass of the substance increases?

olganol [36]

Answer:

If the mass stays constant the object's density decreases as the volume increases. ... Because the property of density is a constant for all variables, density can be used to identify the material an object is made of.

Explanation:

5 0

3 years ago

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Ann [662]

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5 0

3 years ago

The half-life of sr-90 is 28 years. after 56 years of decay only 0. 40 g of a sample remains. what was the mass of the original

Svetradugi [14.3K]

Half-life is the time taken for the concentration of the substance to reduce by 50%. The original sample of strontium had a mass of 1.6 gms. Thus, option d is correct.

The half-life of any radioactive substance is the time period at which the concentration will get reduced to half the initial amount. The initial mass of Sr-90 is calculated as,

$N(t) = N_{0} (\dfrac{1}{2})^{ \frac{t }{t 1/2}}$