Which option is an example of a chemical property?
density
color
melting point
ability to decompose

Answer : The correct option is, ability to decompose.

Explanation :

Chemical change : It is defined as the characteristic of substance that is observed during the chemical reaction when the chemical composition of the substance changes.

For example : flammability, toxicity, acidity, reactivity, heat of combustion, etc.

Physical change : It is defined as the characteristic of substance that is observed during the phase change that means it can be measured when a substance does not change its composition.

For example : color, smell, freezing point, boiling point, melting point, viscosity, density, etc.

From the given options we conclude that, the option ability to decompose  is an example of chemical property while the other options are of the physical property.

Hence, the correct option is, ability to decompose.

give me abc and i will get it for u.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol