What can we say about the number of protons compared with the number of electrons in any atom - explain why this is.

Write the following numbers In scientific notation 0.00033

What is the pressure (in atmospheres) of the sample of gas trapped in the closed-tube mercury manometer shown below if h = 23.6 cm?

Find the mass of 5.60 mol NaOH

Compute 4.659*104-2.14*104. Round the answer appropriately

Which statement correctly describes an atom of the element helium? (9) A. An atom of helium has a full outer energy level and is therefore unusually reactive. B. An atom of helium has eight electrons in its outer energy C.

What is 1.724 L expressed in cm3?

Consider a three sequentially stepped process named as Process A, Process B and Process C. Input comes into Process A. Output form A goes into Process B. Output from B goes into Process C. Output of C is the final output.

What are elements and how do they differ?

Write the structire of the salt that forms when diethylamine is mixed with hydrochloric acis

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.