Examples that have been believed to be science: such as religion, flat earth, etc.
Answer:
The answer is
<h2>5.0 g/cm³</h2>
Explanation:
The density of a substance can be found by using the formula

From the question
mass = 35 g
volume = 7 cm³
The density is

We have the final answer as
<h3>5.0 g/cm³</h3>
Hope this helps you
The mass of magnesium should be less than 0.09g to enable a faster reaction rate. Magnesium reacts to form a white coating around it which stops the reaction. The lesser the gram the faster the reaction before the coating is formed. It is also advisable to use magnesium fillings to increase the rate of reaction.