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Assessment
What is the principle behind the conservation of mass in a chemical reaction?
Mass can be created or destroyed in reactions.
The total mass of reactants equals the total mass of products.
Mass remains constant only in physical changes.
Mass is irrelevant in chemical equations.
What type of bond is formed when two atoms share electrons?
Ionic bond
Covalent bond
Metallic bond
Hydrogen bond
Which of the following elements is a noble gas?
Oxygen
Nitrogen
Argon
Hydrogen
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