A 36.0 g sample of an unknown metal is heated from 25oC to 35oC and 171.7 J of heat is absorbed. Use the chart below to identify the unknown metal.  

Which of the following compounds contains an exception to the octet rule on the central atom? SO3 [1] BF3 [2] NO2 [3]

How many sigma and pi bonds are in the structure below?  

Given the following equations:  Reaction  △H  2 A(s) + 3 B (g) ⟶ 2 C (s)  -800.0 kJ  D(s) + 2 B (g) ⟶ E (s)   -640.1 kJ  Determine the enthalpy change (in kJ) for the reaction below and whether the reaction is exothermic or endothermic.  3 E (s) + 4 A (s) ⟶ 4 C (s) + 3 D (s)   

Which of these ions has the largest radius (S2-, Cl-, K+, or S2-)

Which of the following is the electronic configuration for the Fe2+ ion?

Choose the correct name for NiS2. 

Which of the quantities below are equal in number of atoms present?   3.0 mol sulfur dioxide  9.0 mol helium gas 6.0 mol liquid bromine  

What is the energy of a photon associated with a light of a wavelength of 550 nm?

A sample 3.91 x 1025 atoms of tungsten (W), what would the mass of the sample be in kilograms (kg)?