Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?
F2(1) + Na(s) - NaF 2(s)
CaF20)
F2(g) + Ca(s) -
A
F2(g) + Na(s)
NaF 2(1)
F2(g) + Ca(s)
CaF2(s)
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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

1.solid

2.carbon dioxide

3.helium

i'm pretty sure it is letter c.) car