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Chemistry Quiz 8 (25 MCQs)

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1. The number of _____ will determine theposition of the group of an element.
2. The Maillard Reaction requires natural sugars and another molecule found in protein. What is the other molecule?
3. What is the type of mechanism and an important feature of the reaction between C(CH3)3Br and aqueous NaOH?
4. Substances composed of two or more elements chemically combined in a fixed proportion.
5. If the density of a solution is 4.5g/mL, the mass of 1.4mL solution in significant figure is
6. The _____ contains the protons and neutrons of an atom, and is most of the mass of an atom
7. The atomic number refers to the
8. Which two elements do MOST organic compounds contain?
9. Carbon makes up less than _____ percent of the Earth, s crust.
10. Is water matter if its in a glaicer
11. State change is always a _____ _____
12. Which of the following is an example of $ Heterogeneous\ Mixture$ .
13. The formation of water is an example of a _____ reaction because two simple substances (H and O) combine to produce a new compound (H2O).
14. He was the Greek philosopher who thought that all matter is composed of primal element which is air.
15. Elements are found in the _____
16. What state must the ionic compound be in to be electrolysed?
17. The nucleus of an atom contains
18. In the chemicalsymbol for nitrogen gas, N2, what does the "2" represent?
19. Matter is defined as anything that has mass and occupies _____
20. The volume of 1.7g of NH3 at STP (273K, 1atm) is
21. What type of chemical reaction is this one? Ca + MgCl2 $\rightarrow$ CaCl2 + Mg
22. A scientist uses a computer software to improve catalytic converters in cars. What type of research is used?
23. Mrs. Franklin ismaking chocolate suckers for the class. She takes blocks of chocolate and heatsthem over a fire. The melting chocolate is an example of a-
24. A combination of two or more substances in which the substances retain their distinct identities.
25. Cu is the _____ for copper
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