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Is helium a chemical property

02/10/2021 Client: muhammad11 Deadline: 2 Day

(12. Which of these is a chemical property ? a. Helium is very nonreactive b. Sodium is a soft shiny metal. c. Water has a high specific heat. d. Glycerol is a viscous liquid. .e. Ice melts at 0°C. 13. Which of these is an element? water-compound b. iron ore wood compound d. silver element e. brass 14. Water is an example of a. a homogeneous mixture b. a heterogeneous mixture c. a compound 2 or more atoms form chemical cords w/cach d. an element. - consist of only one type of atom. 15. The symbol for the element cesium is CS Cs b. Cm a. Ca d. Cr e. Cu The symbol Cd stands for the element Cadmium a cadmium b. candelium c. calcium d. cesium e. carbon 17. How many hydrogen atoms are indicated by the formula (NH4),C.H,O2? 2 16 8. 8 + c. 12 d. 14 e. 24
18. Which of the following atomic symbols is incorrect? a) "C b) C. 6 atomic # c) PV d) K 19. Which of these are isotopes of hydrogen? @ " and "c b. H and He c. K and "OK d. PH and PH e. Li and He 20. The number of neutrons in Li is a. 10 b. 9 mass c. 7 #- atomic -4 3 P- 3 21. A species with 12 protons and 10 electrons is a) Ne? b) T12+ V Mg2+ d) Mg e) Ne? 22. Ca" has a) 20 protons, 20 neutrons, and 18 electrons b) 22 protons, 20 neutrons, and 20 electrons c) 20 protons, 22 neutrons, and 18 electrons d) 22 protons, 18 neutrons, and 18 electrons e) 20 protons, 20 neutrons, and 22 electrons mass 40 278 Cat P=20 N=40-20=20 E = 20-(-2)=18 20 atomic

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