Question 1 options: a molecule can be made of one type of element or a mixture of elements. compounds don't act like their elements; compounds act like a different substance. a molecule is two or more atoms bonded together a compound is made of just one type of element question 2 (1 point) sodium

The molecules contain like 54 of water 

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

B. a graduated substance