A burning candle is an example of a chemical reaction taking place. What can be inferred about this reaction? A. Mass is not conserved. B. The reaction absorbs energy. C. The reaction releases energy. D. There are reactants but no products.

Which of the following statement is true?Water changing to ice is an example of chemical change.You always need a catalyst to execute a chemical reaction.Burning of candle is an example of chemical change only.Burning of magnesium in air is an example of combination reaction.

Which One of the following processes does not involve a chemical reaction?a.Melting of candle wax when heatedb.Burning of candle wax when heatedc.Ripening of bananad.Digestion of food in our stomach

A student wants to design a simple investigation to prove that mass is conserved during a chemical reaction.Which of the following investigations will provide evidence the student needs to prove the claim that mass is always conserved in a chemical reaction?A Compare the mass of a candle before and after burning it.B Compare the mass of a piece of paper before and after tearing it.C Compare the mass of a piece of copper before and after melting it.D Compare the mass of a cup of water with a sealed lid and an Alka-Seltzer tab before and after adding the Alka-Seltzer tablet to the water.

The image below shows models that represent the reactants and products of a chemical reaction.Based on the image above, which of the following is true? A. Mass was conserved in this chemical reaction because the same atoms are present in both the products and the reactants. B. Mass was gained in this chemical reaction because there are more atoms in the products than there were in the reactants. C. Mass was lost in this chemical reaction because the atoms in the reactants are smaller than the atoms in the products. D. Mass could have either been gained or lost during this chemical reaction because atoms always change mass when they react.

How does the law of the conservation of mass apply to chemical reactions?A.Atoms can be replaced with other types of atoms.B.Atoms cannot be added or lost in a chemical reaction.C.Atoms can be lost in a chemical reaction but not added.D.Atoms cannot be rearranged in a chemical reaction.