In 0.25 mole there are 1.5*1023 molecules of 02 since there are 6.02*1023 particles in one mole.
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Answer:
A
Explanation:
A chemical change happens when one chemical substance is transformed into one or more different things , such as when iron becomes rust so
B: Acids turn the indicator red, pink, orange, and yellow, while bases turn it green based on what it reactions with or comes in contact with so b is maybe
c is wrong
and d a physical change, will technically yes and no there should have not been a smell afterwards so the only really choose that makes sense here is A
Covalent bonding is the sharing of electrons between atoms. This bonding occurs primarily between nonmetals. <span>If atoms have similar electronegativities (the same affinity for electrons), covalent bonds are most likely to occur. Because both atoms have the same affinity for electrons and neither has a tendency to donate them, they share electrons in order to achieve octet configuration and become more stable. </span>