Which of these is an example of a physical change?

a) burning a log

b) ripping a piece of paper

c) steel rusting

d) wood decaying

If element x has 55 protons how many electrons does it have

An atom has 18 protons and 8 valence electrons which statement would best identify this element

Using the following equation for the combustion of octane, calculate the amount of moles of carbon dioxide formed from 100.0 g of octane. The molar mass of octane is 114.33 g/mole. The molar mass of carbon dioxide is 44.0095 g/mole.

Where are valves found?

The color indigo has a wavelength of 410.1 nm. What is the energy (in joules) of the color indigo?

Which laws can be combined to form the ideal gas law? Boyle's law and Charles's law Gay-Lussac's law and Avogadro's law Charles's law, Avogadro's law, and Boyle's law Dalton's law, Gay-Lussac's law, and Avogadro's law

What determines the horizontal arrangement of the periodic table?

A 55.3 g sample of lead heated and then quenched in a 175g sample of water. During the quenching reaction the temperature of the water increases from room temperature, 25.0 °C, to 42.6 °C.

What conclusion can you draw from this experiment about the components of the black ink

How does the size of ions affect the conductivity of a solution?