An element is identified by:

A. Its number of protons

B. the atomic mass

C. The type of charge

D. its number of isotopes

Which is more reactive, Sodium or Magnesium?

Which of the following do physicists believe are fundamental particles? a. three quarks and three leptons c. three quarks and six leptons b. six quarks and three leptons d. six quarks and six leptons

What mineral is most likely used to make the MP3 player?

1-bromodecane (C10H21Br) produces a mass spectrum with a parent molecular ion (M) peak at m/z 220 (100%). A peak at m/z 222 (98%) also appears in the spectrum. What causes this signal in the mass spectrum

Convert 2.0 mm3 to the unit m3. a. 2.0 x 10-6 m3 b. 2.0 x 10-3 m3 c. 2.0 x 10-9 m3 d. 2.0 x 103 m3

Glucose is not made from which of the following

Rank the temperatures from the highest to the lowest. 133F 351K 25C 273K 146C 58F 95F

Calculate the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g.

Where the single machos?

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = - 320.1 kJ/mol and ΔS = - 86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.