Lập công thức hóa học Na[1] và O[2]

C<4> và S<2>

Ca <2> và No3 <1>

Ba <2> và So4 <2>

Fe <3> và So4 <2>

Ag <1> và Cl <1>

The answer is d because i just took the test

Standing in the sunlight and feeling the heat on your face (uv radiation is entering the skin, converting to infrared radiation, and is absorbed by your tissues)orstanding near a fire and feeling the heat on your skin (infrared radiation transfer)

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o