If the one of the box accelerates 9m/^2,how will the stack of 3 boxes accelerate? Explain
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D. most models represent a real world object in a simpler way

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place.

Answerhund's rule;