How many significant figures are in the measurement, 205.00 g? 4 5 6 6 7 8 In a

Question

How many significant figures are in the measurement, 205.00 g? 4 5 6 6 7 8 In a chemical reaction, matter is neither created nor destroyed. Which law does this refer to? First Law of Thermodynamics Law of Modern Atomic Theory Law of Definite Proportions Law of the Conservation of Mass law of Multiple Proportion Isotopes differ in the number of what particle? Alpha particles protons electrons neutrons gamma particles The mass number is equal to the sum of the number of the electrons and protons the sum of the number of the neutrons and electrons. the sum of the number of the protons, neutrons, and electrons. The sum of the number of protons and neutrons. What does "X" represents in the following symbol?^80_35 X mercury bromine chlorine scandium selenium Determine the number of protons, neutrons and electrons in the following:^25_12 X p^+ = 25 n degree = 12 e^- = 13 p^+ = 12 n degree = 13 e^- = 25 p^+ = 12 n degree = 12 e^- = 13 p^+ = 12 n degree = 13 e^- = 12 p^+ = 12 n degree = 25 e^- = 12 Which of the following elements is a noble gas? K Hr N O Kr Give the symbol for gold. GI Gd Au Go Ag How many moles of LiI are contained in 258.6 mL of 0.0337 M Lil solution? 1.31 times 10^-3 mol 8.74 times 10^-3 mol 1.14 times 10^-3 mol 3.67 times 10^-3 mol 7.65 times 10^-3 mol

Explanation / Answer

29) The original (295.00) had 5 significant figures and a least significant decimal of -2.

30) law of conservation of mass

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

31) neutrons

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

32) The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons

33) Bromine is a chemical element with symbol Br and atomic number 35.

34) D

35) Kr = krypton

36) Au

37) molarity = number of moles / volume (L)

no. of moles = V x M

n = (0.2586 L x 0.0337 M) = 0.008714 ~ 8.74 x10-3 moles

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