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Chemistry Quiz 20 (25 MCQs)

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1. The energy of the moving electrons is
2. How is chemical change different from physical change?
3. What is the precipitate formed when you mix silver nitrate with copper chloride?
4. Particles move but stay relatively close to one anther
5. An atoms mass number equals the number of
6. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
7. Who is regarded as father of modern chemistry?
8. Valence electrons determine an atoms
9. What is hottest part of the gas flame is called?
10. Which subatomic particle would have the greatest potential energy?
11. Which of the following is not one of the major elements present in the human body?
12. The Chemical Symbol of Sodium is
13. What is the CORRECT formula of ammonium sulfide?
14. If the atomic number is 10 and the atomic mass is 23.10, how neutrons does that atom have?
15. The oil used in the froth floatation process is
16. Which biomolecule contain your genetics?
17. One difference between carbon-12 and carbon-14 is that carbon-14 has
18. Which combination of temperature and pressure correctly describes standard temperature and pressure, STP?
19. What element is located in group 2, period 3?
20. A molecule of H2, S, O4 contains how many atoms?
21. The substance that does the dissolving
22. If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?
23. The number of significant figures in the measurement 170.040 km is
24. A magnesium atom has an atomic number of 12, a mass number of 25, and a +2 charge. This atom would contain _____ protons, _____ neutrons, and _____ electrons.
25. How many oxygen atoms are in the compound C3H5(OH)3
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