What happens to substances during a chemical change

Why is predicting our future oil supply controversial and involves some uncertainty? I just need some explaining.

Determine the amount of both hydrogen and oxygen in a 500mL sample of Water.

In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together).

Consider the unbalanced equation for the combustion of hexane: 2C6H14 (g) + 19O2 (g) →12CO2 (g) + 14H2O (g) Determine how many moles of O2 are required to react completely with 7.9 moles C6H14.

A solution with a pH of 6 is a base

Which of the following is true about a scientific hypothesis? A. The hypothesis must form a scientific theory. B. The hypothesis must be testable. C. The hypothesis must predict the outcome of the experiment. D.

Convert 1.76 um to inches

Why is lewis electron-dot diagrams more suitable than electron-shell diagrams illustrating chemical bonds

What mass of sodium benzoate should be added to 150.0 ml of a 0.15 m benzoic acid solution in order to obtain a buffer with a ph of 4.25? (assume no volume change.) ?

Match the term with its definition. A. Bed load A strip of land next to a river that is often very fertile B. Headwater The beginning of a river C. Suspended load Large boulders carried along by a river D.