A Year at a Construction Site (Time Goes By) by Nicholas Harris PDF

A Year at a Construction Site (Time Goes By) by Nicholas Harris PDF

By Nicholas Harris

ISBN-10: 0761346759

ISBN-13: 9780761346753

Describes how a faculty is outfitted over 365 days and offers a bird's eye view of the complete strategy in 8 scenes.

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Sample text

Phenolphtha they ns mea ch whi water are both indicators, ic. bas or ic acid show whether a liquid is cture They change color because the stru on the ing end dep of their molecules change ent. pres l roxy hyd amount of hydronium or T o p T ip The liquid turns pink, which means the washing powder is a base 36 If you add a few drops of an acid (such as vinegar or lemon juice) to the bright pink mixture, the acid and base wi ll cancel each other out, neutra lizing the liquid so it turns clear ag ain.

Molecules are usually folded up Stretching the rubber band straightens out the molecules seconds in e c n ie c s Paddle power top tip Your racer w ill probably w ork better on carp et than on po lished surfaces as it will have mor e traction. To im prove the grip between the car’s wheels and the surface yo u’re racing it on, try stretching ru bber bands ar ound the wheels. 5 in (6 cm). Loop a rubber band around the sticks. 5 in (4 cm) through the rubber band and rotate it. This winds up the rubber band and powers up the boat.

Like rusting, burning is an oxidation reaction. Burning is a much faster and more energetic chemical reaction than rusting, so it gives out a lot more heat—and light, too. 32 Remove the thermometer and cardboard lid. Put a ball of steel wool into the jar and pour vinegar over it. Let it sit for a minute. Remove the steel wool, shake it dry, and pour away the vinegar. The vinegar strips away the steel wool’s protective coating, exposing the metal underneath to the air. how does this work? Fire! 20 mins 2 Cut out a circle of cardboard that is bigger than the neck of your jar.

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A Year at a Construction Site (Time Goes By) by Nicholas Harris


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