When paper is burned, the mass of the remaining ash is less than the mass of the original paper. Which statement best explains this result? A. The ash has less volume than the paper. B. Some of the matter is destroyed during the reaction. C. The mass of the ash cannot be accurately determined. D. Some of the products of the reaction were given off as a gas.

When a fire burns a log of wood, the mass ofthe ashes left behind is much less than themass of the original log. Is this an exception tothe law of conservation of mass? Explain

Professor Boswell calculated the amount of mass in a piece of wood.  He then burned the wood in a container until it was only ashes and gases.  The masses of the ashes and gases combined ___

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.

A scientist performed an experiment using a wax candle and a large airtight glass container filled with oxygen. Nothing could get into or out of the glass container during the experiment. The scientist measured the weight of the unlit candle and the container to be 32 ounces at the beginning of the experiment. Then, she lit the candle. After a short time, the candle stopped burning and it appeared slightly smaller.What will the weight of the candle and the container be now that the experiment is over? A. The weight will be exactly 32 ounces because weight is always conserved in closed systems. B. The weight will be more than 32 ounces because burning the candle creates smoke. C. The weight will be less than 32 ounces because smoke weighs less than wax. D. The weight will be less than 32 ounces because burning the candle turns it into energy.Reset Submit

If a crumpled piece of notebook paper and a flat sheet of notebook paper are dropped at the same time from the same height, why does the crumpled piece of paper land first?A The crumpled paper has more gravitational force exerted on it.B The flat paper has more air resistance.C The flat paper has more mass.D The crumpled paper has less mass.