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Chemistry Quiz 45 (25 MCQs)

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1. Which of the following are isomers of pentane? I. 2-methylpentaneII. methylbutaneIII. dimethylpropane
2. Which of the following are NOT signs that a chemical reaction occured?
3. A pure substance made of only one kind of atom
4. What product is formed when CH3CH(OH)CH3 is reacted with acidified potassium dichromate(VI)?
5. Which of the following is NOT an element?
6. Which formula is correct to calculate the $ No.\ of\ moles$?
7. _____ are organic compounds that are good sources of energy. They contain carbon, hydrogen, and oxygen in a 1:2:1 ratio
8. An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?
9. Makes up about 80% of the periodic table, good conductors of heat and electricity, high luster and malleable.
10. Elements are found in _____ (solid earth)
11. The basic unit of all matter is called a(n)
12. Which of the following gives an accurate definition for a weak acid?
13. Most of water's properties occur because it is _____
14. Which of the following is true about ammonia solution in methylbenzene?
15. You should tie back long hair or baggy clothing
16. Which best illustrates a heterogeneous substance?
17. Balance this reaction:_____ AlBr3 + _____ K2SO4 $\rightarrow$ _____ KBr + _____ Al2(SO4)3
18. Which element can be found pure in nature in three forms as diamonds as graphite and as amorphous carbon?
19. A 0.1 mol dm-3nitric acid solution shows a pH value of 1.0.What volume of water must be added to 90.0 cm3 of this solution to obtain a final pH value of 2?
20. In the following unbalanced equation, what coefficients would have to go in the blanks (left to right) in order for it to become balanced? _____ Al + _____ HCl $\rightarrow$ _____ AlCl3 + _____ H2
21. An element is made of _____
22. What group of biomolecules contain long hydrocarbon chains and are considered nonpolar?
23. Measure of the space occupied by an object.
24. Organic compounds are _____ based molecules.
25. The $ atomic\ no.$ of an element is $ 19$ and its $ mass\ no.$ is $ 39$ . What is the no. of $ neutrons$?
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