Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. according to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete? never mind i got it

The law of conservation of mass dictates that the total mass of reactants must be equal to the total mass of the products. Thus:

mass(MgO) = mass(Mg) + mass(O)

mass(MgO) = 24 + 16

mass(MgO) = 40 g

The answer is 40 g.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance