Which process represents a chemical change?
An 88 gram iron nail rusted. The rusted nail (iron oxide) had a mass of 102 grams. What was the mass of oxygen that reacted with the nail?
What happens during a physical change?
Which is a clue that a chemical change has occurred?
Which of the following would cause a chemical change in a piece of wood?
A physical change is taking place when
According to the law of conservation of mass, which of the following is a true statement about any chemical reactions?
According to the law of conservation of mass, which of these statements is true?
If you heat a liquid to determine the temperature at which it forms bubbles and changes to a gas, you are measuring
Elements in the same column of the periodic table have
Which of these is a physical change?
Which is always true of a balanced chemical equation?
Which of the following statements about elements is false?
Which of these is not evidence that a chemical change may have taken place?
You can balance a chemical equation by changing the
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