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1. A baking powder can carries the statement, "Ingredients: corn starch, sodium bicarbonate, calcium hydrogen phosphate, and sodium aluminum sulfate." Therefore, this baking powder is
A. a compoundB. a mixtureC. a moleculeD. a mixture of elementsE.
2. Which of the following is a physical property of sugar?
A. It decomposes readily.B. Its composition is carbon, hydrogen, and oxygen.C. It turns black with concentrated H2SO4.D. It can be decomposed with heat.E. It is a white crystalline solid.
3. A substance that can be further simplified using ordinary means may be either
A. an element or a compoundB. an element or a mixtureC. a mixture or a compoundD. a mixture or an atomE.
4. Chemical action may involve all of the following EXCEPT
A. combining of atoms of elements to form a moleculeB. separation of the molecules in a mixtureC. breaking down compounds into elementsD. reacting a compound and an element to form a new compound and a new elementE.
5. The energy of a system can be
A. easily changed to massB. transformed into a different formC. measured only as potential energyD. measured only as kinetic energyE.
6. If the ΔH of a reaction is a negative quantity, the reaction is definitely
A. endothermicB. unstableC. exothermicD. reversibleE.
7. If the graphic representation of the energy levels of the reactants and products in a chemical reaction looks like this:
Which of the following statements are true?
I. The activation energy for the forward reaction is represented by the "a" portion.
II. The activation energy for the forward reaction is represented by the "b" portion of the graph.
III. The "a" portion is the energy given off in the forward reaction.
A. I onlyB. II onlyC. I and III onlyD. II and III onlyE. I, II, and III
8. A substance that can be further simplified by ordinary chemical means may be which of the following?
I. An element or a compound
II. A mixture or a compound
III. An element of a mixture
A. I onlyB. II onlyC. III onlyD. I and II onlyE. I, II, and III
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