Answer:
True
Explanation:
Yes this statement is true.
In a physical change, some of the physical properties of the substance may be altered and the chemical composition remains the same.
Answer:
When hydrogen is subjected to large enough pressure, it solidifies according to theory.
Explanation:
According to theory, when hydrogen molecules are subjected to enormous degree of pressure the molecules will solidify.
What happens here is that the hydrogen–hydrogen bonds in the hydrogen molecule will break apart and the molecules collapses into hydrogen atoms.
Hence, when hydrogen is subjected to large enough pressure, it solidifies according to theory.
The problem ask to show the reaction between the two elements which is calcium and oxygen to form an ionic compound. Base on the data that Calcium has n electronic compound of 2.8.8.2 and oxygen has 2.6, the reaction of the both is to add 2 electron in Calcium and also in the oxygen because both of the m has 2 extra electron
The mixture of alcohol and water is a homogeneous mixture where the components are thoroughly mixed and cannot be separated by naked eyes.
The easiest way to separate alcohol from water is by boiling the mixture. The boiling point of alcohol is lower than that of water. Therefore, alcohol will turn into steam before water. This steam can easily be condensed into a separate container.
