Formulate a hypothesis for the student's question."If a candle is contained in a metal holder then the time taken for the candle to burn will ____________ because ______________________________________________________________________ .

Describe an investigation a student could do to find how the resistance of a metalsample varies with temperature. The student uses the equipment shown.Include in your answer:• how the student should use the equipment• the measurements the student should make• how the student should use these measurements to determine the resistance• how to make sure the results are valid.

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

When a metal is put in water it starts floating and some gas is evolved from it without any fire. A burning candle is put off with a pop sound when a candle is exposed to this gas. The metal can be ____ .

Write a hypothesis for this experiment in the space provided below. A hypothesis is your predicition of what will happen when you do the experiment.

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.