Which is NOT an example of a pure substance?

A. water

B. oxygen

C. antifreeze

D. carbon dioxide

What power is generated by converting the kinetic energy of falling water to electricity? A. Geothermal B. Photovoltaic C. Hydrophobic D. Hydroelectric

Which temperature change indicates an increase in the average kinetic energy of the molecules in a sample? 15°C to 298 K 37°C to 273 K 305 K to 0°C 355 K to 25°C

Taking onto onsideration of mass

Why can't the subscripts be changed?

Which particle determines the identity of an atom

Which color has a higher frequency, A. red light B. blue light

what is the volume of 0.98 mol oxygen (O2) gas at 275 K and a pressure of 2.0 atm? (the universal gas constant is 0.0821 L*atm/mol*K)

Which element is classified as an alkali metal? Rb Sr Zr Cl

Which statements about a neutral atom are correct? Check all that apply. The positively charged particles in the nucleus are positrons. The radius of the electron cloud is twice as large as the radius of the nucleus.

The STP conditions are ... a) 0C and 1 atm b) 0C and 760 kPa C) 0K and 1 atm d) 0K and 760 kPa