Which of the following happens during a chemical change? Check all of the boxes that apply.
The symbol for hydrogen is ✔ H.He.Ho.
The symbol for nitrogen is Ni.Nd.✔ N.
The symbol for iron is I.Ir.✔ Fe.
The symbol for copper is C.Co.✔ Cu.
Use the periodic table to select the chemical symbol for each element.The symbol for carbon is ✔ C.Ca.Cm.
Select the description of each substance given by each chemical formula. One molecule of O2 is made of X one atom of oxygen.one atom of osmium.two atoms of oxygen.
The compound Al2O3 is made of one atom of aluminum to two atoms of oxygen.✔ two atoms of aluminum to three atoms of oxygen.one atom of aluminum, two atoms of iodine, and three atoms of oxygen.
The compound KOH is called calcium oxygen hydride.✔ potassium hydroxide.krypton hydroxyl.
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