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Q 1/6
Score 0
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?
30
Some of the products of the reaction were given off as a gas.
The ash has less volume than the paper.
Some of the ash cannot be accurately determined.
Some of the matter is destroyed during the reaction.
Q 2/6
Score 0
When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of these is true of this process?
30
The products have different chemical properties than those of the reactants.
Sulfur dioxide and sulfur trioxide are the reactants in this change.
The products contain more sulfur atoms and fewer oxygen atoms than the reactants.
The identity of each reactant remains the same.
6 questions
Q.
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?
1
30 sec
Q.
When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of these is true of this process?
2
30 sec
Q.
Ethane (C2H6) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation. 2C2H6 + 7O2 --> 4CO2 + 6H2O Which substance is a product in this reaction?
3
30 sec
Q.
Which number completes the balanced chemical equation showing the process of rusting? 4Fe + 3O2 --> _____Fe2O3
4
30 sec
Q.
Use the model to answer the question. This model shows a single unit of a compound containing several elements. Which of these is the chemical formula for the substance?
5
30 sec
Q.
Use the photo to answer the question. Zinc and hydrochloric acid are combined in a test tube. Which of the following is not true about the chemical reaction taking place?
